10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2018

OR

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from    to

Commission file number 001-36599

MB FINANCIAL, INC.

(Exact name of registrant as specified in its charter)

Maryland	36-4460265
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
800 West Madison Street, Chicago, Illinois	60607
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code:  (888) 422-6562

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days.  Yes xNoo

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).  YesxNoo

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company.  See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filerx	Accelerated filero
Non-accelerated filero	Smaller reporting companyo
	Emerging growth companyo

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  YesoNox

There were issued and outstanding 84,236,864 shares of the Registrant’s common stock as of November 9, 2018.

MB FINANCIAL, INC.

FORM 10-Q

September 30, 2018

INDEX

		Page
PART I.	FINANCIAL INFORMATION
Item 1.	Financial Statements	1
	Consolidated Balance Sheets	1
	Consolidated Statements of Operations	2
	Consolidated Statements of Comprehensive Income	4
	Consolidated Statements of Changes in Stockholders’ Equity	5
	Consolidated Statements of Cash Flows	6
	Notes to Consolidated Financial Statements	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	53
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	77
Item 4.	Controls and Procedures	79
PART II.	OTHER INFORMATION
Item 1.	Legal Proceedings	80
Item 1A.	Risk Factors	80
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	81
Item 6.	Exhibits	82
	Signatures	89

i

PART I.        FINANCIAL INFORMATION

Item 1.   Financial Statements

MB FINANCIAL, INC. & SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(Amounts in thousands, except share and per share data)

	(Unaudited)
	September 30, 2018			December 31, 2017
ASSETS
Cash and due from banks	$	342,933		$	397,880
Interest earning deposits with banks	87,740			181,341
Total cash and cash equivalents	430,673			579,221
Investment securities:
Securities available for sale, at fair value	1,710,636			1,408,326
Securities held to maturity, at amortized cost ($932,756 fair value at September 30, 2018 and $992,455 at December 31, 2017)	923,082			959,082
Marketable equity securities, at fair value	10,901			—
Non-marketable securities - FHLB and FRB stock	107,407			114,111
Total investment securities	2,752,026			2,481,519
Loans held for sale	51,834			548,578
Loans:
Total loans, excluding purchased credit-impaired loans	13,843,880			13,846,318
Purchased credit-impaired loans	91,072			119,744
Total loans	13,934,952			13,966,062
Less: Allowance for loan and lease losses	155,411			157,710
Net loans	13,779,541			13,808,352
Lease investments, net	429,843			409,051
Premises and equipment, net	274,006			286,690
Cash surrender value of life insurance	207,280			203,602
Goodwill	999,925			1,003,548
Other intangibles	49,114			54,766
Mortgage servicing rights, at fair value	295,803			276,279
Other real estate owned, net	10,933			9,736
Other real estate owned related to FDIC-assisted transactions	2,661			4,788
Other assets	436,332			420,810
Total assets	$	19,719,971		$	20,086,940
LIABILITIES AND STOCKHOLDERS’ EQUITY
LIABILITIES
Deposits:
Non-interest bearing	$	6,036,012		$	6,381,512
Interest bearing	8,672,781			8,576,866
Total deposits	14,708,793			14,958,378
Short-term borrowings	903,355			861,039
Long-term borrowings	451,677			505,158
Junior subordinated notes issued to capital trusts	133,995			211,494
Accrued expenses and other liabilities	556,822			541,048
Total liabilities	16,754,642			17,077,117
STOCKHOLDERS’ EQUITY
Preferred stock, ($0.01 par value, authorized 10,000,000 shares at September 30, 2018 and December 31, 2017; Series A, 8% perpetual non-cumulative, none issued and outstanding at September 30, 2018 and 4,000,000 shares issued and outstanding at December 31, 2017, $25 liquidation value; Series C, 6% perpetual non-cumulative, 200,000 shares issued and outstanding at September 30, 2018 and December 31, 2017, $1,000 liquidation value)	194,719			309,999
Common stock, ($0.01 par value; authorized 120,000,000 shares at September 30, 2018 and December 31, 2017; issued 86,160,783 shares at September 30, 2018 and 85,801,702 shares at December 31, 2017)	862			858
Additional paid-in capital	1,703,404			1,691,007
Retained earnings	1,147,060			1,065,303
Accumulated other comprehensive (loss) income	(17,186		)	3,584
Less: 1,940,112 and 1,883,810 shares of treasury common stock, at cost, at September 30, 2018 and December 31, 2017, respectively	(63,530		)	(60,928		)
Total stockholders’ equity	2,965,329			3,009,823
Total liabilities and stockholders’ equity	$	19,719,971		$	20,086,940

     See Accompanying Notes to Consolidated Financial Statements.

1

MB FINANCIAL, INC. & SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

(Amounts in thousands, except share and per share data)(Unaudited)

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2018			2017			2018			2017
Interest income:
Loans:
Taxable	$	168,190		$	155,440		$	489,710		$	432,603
Nontaxable	2,146			2,632			6,747			8,303
Investment securities:
Taxable	10,366			8,440			28,878			26,279
Nontaxable	9,387			9,731			28,302			29,541
Other interest earning accounts and Federal funds sold	1,650			327			2,025			754
Total interest income	191,739			176,570			555,662			497,480
Interest expense:
Deposits	20,485			10,865			52,903			27,133
Short-term borrowings	2,317			5,148			7,602			11,440
Long-term borrowings and junior subordinated notes	7,089			3,610			20,859			9,923
Total interest expense	29,891			19,623			81,364			48,496
Net interest income	161,848			156,947			474,298			448,984
Provision for credit losses	21,503			4,517			35,230			17,950
Net interest income after provision for credit losses	140,345			152,430			439,068			431,034
Non-interest income:
Mortgage banking revenue	9,916			28,242			53,889			86,850
Lease financing revenue, net	25,205			23,148			72,833			62,967
Treasury management fees	15,226			14,508			45,448			43,696
Wealth management fees	9,089			8,702			27,179			25,720
Card fees	5,362			4,585			15,803			13,564
Capital markets and international banking fees	1,913			4,870			8,696			11,709
Consumer and other deposit service fees	3,051			3,424			8,892			10,072
Brokerage fees	1,138			1,004			3,052			3,379
Loan service fees	2,103			2,114			6,496			6,120
Increase in cash surrender value of life insurance	1,298			1,321			3,678			3,910
Net (loss) gain on investment securities	(85		)	83			(345		)	451
Net loss on disposal of other assets	(32		)	(180		)	(786		)	(307		)
Other operating income	5,657			4,110			16,114			11,420
Total non-interest income	79,841			95,931			260,949			279,551
Non-interest expenses:
Salaries and employee benefits expense	101,885			105,815			331,877			309,932
Occupancy and equipment expense	16,117			15,382			49,997			45,710
Computer services and telecommunication expense	12,684			10,062			34,711			29,287
Advertising and marketing expense	3,432			2,558			10,637			8,964
Professional and legal expense	2,586			2,109			13,371			7,250
Other intangibles amortization expense	1,854			2,038			5,652			6,214
Branch exit and facilities impairment charges	3,292			2,773			3,632			8,680
Net loss (gain) recognized on other real estate owned and other related expense	248			(86		)	1,343			1,448
Loss on extinguishment of debt	6,255			—			9,391			—
Goodwill impairment loss	—			—			3,623			—
Other operating expenses	20,191			22,310			65,188			68,030
Total non-interest expenses	168,544			162,961			529,422			485,515
Income before income taxes	51,642			85,400			170,595			225,070
Income tax expense	8,928			24,557			32,591			65,224
Net income	42,714			60,843			138,004			159,846
Dividends on preferred shares	3,000			2,002			9,100			6,007
Return from preferred stockholders due to redemption	—			—			(15,280		)	—
Net income available to common stockholders	$	39,714		$	58,841		$	144,184		$	153,839

2

MB FINANCIAL, INC. & SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS - (Continued)

(Amounts in thousands, except share and per share data)(Unaudited)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Common share data:
Basic earnings per common share	$	0.47	$	0.70	$	1.71	$	1.84
Diluted earnings per common share	0.47		0.69		1.69		1.81
Weighted average common shares outstanding for basic earnings per common share	84,369,519		83,891,175		84,230,835		83,799,694
Diluted weighted average common shares outstanding for diluted earnings per common share	85,335,109		84,779,797		85,162,220		84,775,952

See Accompanying Notes to Consolidated Financial Statements.

3

MB FINANCIAL, INC. & SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Amounts in thousands) (Unaudited)

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2018			2017			2018			2017
Net income	$	42,714		$	60,843		$	138,004		$	159,846
Unrealized holding (gains) losses on investment securities, net of reclassification adjustments	(10,296		)	(890		)	(30,356		)	9,143
Reclassification adjustment for amortization of unrealized losses (gains) on investment securities transferred to held to maturity from available for sale	152			(266		)	418			(1,089		)
Reclassification adjustments for losses (gains) included in net income	85			(83		)	345			(451		)
Other comprehensive (loss) income, before tax	(10,059		)	(1,239		)	(29,593		)	7,603
Income tax expense (benefit) related to items of other comprehensive (loss) income	2,691			491			7,916			(3,021		)
Other comprehensive (loss) income, net of tax	(7,368		)	(748		)	(21,677		)	4,582
Comprehensive income	$	35,346		$	60,095		$	116,327		$	164,428

See Accompanying Notes to Consolidated Financial Statements.

4

MB FINANCIAL, INC. & SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY

Nine Months EndedSeptember 30, 2018 and 2017

(Amounts in thousands, except per share data) (Unaudited)

	Preferred Stock			Common Stock		Additional Paid-in Capital			Retained Earnings			Accumulated Other Comprehensive Income (Loss), Net of Tax			Treasury Stock			Non-controlling Interest			Total Stock- holders’ Equity
Balance at December 31, 2016	$	115,572		$	856	$	1,678,826		$	838,892		$	5,190		$	(60,384	)	$	257		$	2,579,209
Net income	—			—		—			159,846			—			—			—			159,846
Other comprehensive income, net of tax	—			—		—			—			4,582			—			—			4,582
Conversion of preferred stock to common stock	(292		)	—		292			—			—			—			—			—
Cash dividends declared on preferred shares	—			—		—			(6,007		)	—			—			—			(6,007		)
Cash dividends declared on common shares ($0.61 per share)	—			—		—			(51,783		)	—			—			—			(51,783		)
Restricted common stock activity, net of tax	—			—		(6,829		)	—			—			3,549			—			(3,280		)
Stock option activity, net of tax	—			2		330			—			—			—			—			332
Repurchase of common shares in connection with employee benefit plans and held in trust for deferred compensation plan	—			—		605			—			—			(3,902		)	—			(3,297		)
Stock-based compensation expense	—			—		13,317			—			—			—			—			13,317
Purchase of additional investment in subsidiary from minority owners	—			—		(570		)	—			—			—			(257		)	(827		)
Balance at September 30, 2017	$	115,280		$	858	$	1,685,971		$	940,948		$	9,772		$	(60,737	)	$	—		$	2,692,092
Balance at December 31, 2017	$	309,999		$	858	$	1,691,007		$	1,065,303		$	3,584		$	(60,928	)	$	—		$	3,009,823
Cumulative effect of accounting changes	—			—		—			(1,204		)	907			—			—			(297		)
Net income	—			—		—			138,004			—			—			—			138,004
Other comprehensive loss, net of tax	—			—		—			—			(21,677		)	—			—			(21,677		)
Redemption of preferred stock	(115,280		)	—		—			15,280			—			—			—			(100,000		)
Cash dividends declared on preferred shares	—			—		—			(9,100		)	—			—			—			(9,100		)
Cash dividends declared on common shares ($0.72 per share)	—			—		—			(61,223		)	—			—			—			(61,223		)
Restricted common stock activity, net of tax	—			2		(3,178		)	—			—			—			—			(3,176		)
Stock option activity, net of tax	—			2		856			—			—			—			—			858
Repurchase of common shares in connection with employee benefit plans and held in trust for deferred compensation plan	—			—		1,031			—			—			(2,602		)	—			(1,571		)
Stock-based compensation expense	—			—		13,688			—			—			—			—			13,688
Balance at September 30, 2018	$	194,719		$	862	$	1,703,404		$	1,147,060		$	(17,186	)	$	(63,530	)	$	—		$	2,965,329

See Accompanying Notes to Consolidated Financial Statements.

5

MB FINANCIAL, INC. & SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Amounts in thousands) (Unaudited)

	Nine Months Ended
	September 30,
	2018			2017
Cash Flows From Operating Activities
Net income	$	138,004		$	159,846
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment and leased equipment	84,762			69,859
Branch exit and facilities impairment charges	3,632			8,680
Compensation expense for share-based payment plans	13,688			13,317
Net loss (gain) on sales of premises and equipment and leased equipment	633			(794		)
Amortization of other intangibles	5,652			6,214
Provision for credit losses	35,230			17,950
Deferred income tax expense	32,190			37,574
Amortization of premiums and discounts on investment securities, net	24,998			30,124
Accretion of discounts on loans, net	(13,789		)	(21,760		)
Net loss (gain) on investment securities	345			(451		)
Proceeds from sale of loans held for sale	2,442,638			3,665,709
Origination of loans held for sale	(2,051,710		)	(3,629,230		)
Net loss (gain) on sale of loans held for sale	11,087			(10,073		)
Origination of mortgage servicing rights	(30,086		)	(43,197		)
Change in fair value of mortgage servicing rights	10,723			20,601
Net loss on other real estate owned	798			1,397
Increase in cash surrender value of life insurance	(3,678		)	(3,910		)
Loss on extinguishment of debt	9,391			—
Goodwill impairment loss	3,623			—
(Decrease) increase in other assets, net	(8,401		)	18,075
Decrease in other liabilities, net	(16,074		)	(49,043		)
Net cash provided by operating activities	693,656			290,888
Cash Flows From Investing Activities
Proceeds from sales of investment securities available for sale	2,610			2,271
Proceeds from maturities and calls of investment securities available for sale	312,450			249,264
Purchases of investment securities available for sale	(668,673		)	(66,402		)
Proceeds from maturities and calls of investment securities held to maturity	82,245			105,065
Purchases of investment securities held to maturity	(56,271		)	(36,877		)
Purchase of marketable equity securities	(376		)	—
Proceeds from sales of marketable equity securities	178			—
Purchases of non-marketable securities - FHLB and FRB stock	(44,505		)	(135,479		)
Redemption of non-marketable securities - FHLB and FRB stock	51,208			126,410
Net decrease (increase) in loans	85,407			(1,100,271		)
Purchases of mortgage servicing rights	(161		)	(839		)
Purchases of premises and equipment and leased equipment	(99,225		)	(130,313		)
Proceeds from sales of premises and equipment and leased equipment	5,780			20,860
Proceeds from sale of other real estate owned	3,727			18,432
Proceeds from sale of other real estate owned related to FDIC-assisted transactions	1,469			3,141
Purchase of additional investment in subsidiary from minority owners	—			(827		)
Net proceeds from FDIC related covered assets	818			(583		)
Net cash used in investing activities	(323,319		)	(946,148		)
Cash Flows From Financing Activities
Net (decrease) increase in deposits	(249,585		)	304,696
Proceeds from short-term borrowings - FHLB advances	340,000			3,125,000
Principal paid on short-term borrowings - FHLB advances	(725,000		)	(3,150,000		)
Net increase in other short-term borrowings	167,316			171,127
Proceeds from long-term borrowings	465,130			348,235
Principal paid on long-term borrowings	(258,611		)	(104,310		)
Redemption of junior subordinated notes issued to capital trusts	(87,631		)	—
Redemption of preferred stock	(100,000		)	—
Treasury stock transactions, net	(1,571		)	(3,238		)
Stock options exercised	3,399			1,715
Dividends paid on preferred stock	(11,100		)	(6,007		)
Dividends paid on common stock	(61,232		)	(51,711		)
Net cash (used in) provided by financing activities	(518,885		)	635,507
Net decrease in cash and cash equivalents	$	(148,548	)	$	(19,753	)
Cash and cash equivalents:
Beginning of period	579,221			463,469
End of period	$	430,673		$	443,716

6

MB FINANCIAL, INC. & SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS - (Continued)

(Amounts in thousands) (Unaudited)

	Nine Months Ended
	September 30,
	2018		2017
Supplemental Disclosures of Cash Flow Information:
Cash payments for:
Interest paid to depositors and on other borrowed funds	$	81,364	$	47,104
Income tax payments (refunds), net	3,511		(4,762		)
Supplemental Schedule of Noncash Investing Activities:
Investment securities held to maturity purchased not settled	$	1,699	$	2,433
Loans transferred to other real estate owned	4,974		6,467
Loans transferred to other real estate owned related to FDIC-assisted transactions	—		2,721
Loans transferred to repossessed assets	1,878		1,410
Operating leases rewritten as direct finance leases included as loans	2,359		1,484
Long-term borrowings transferred to short-term borrowings	260,000		150,000
Supplemental Schedule of Noncash Investing Activities From Acquisitions:
Adjustments to noncash assets previously acquired:
Loans	$	—	$	1,846
Goodwill	—		(1,113		)
Other assets	—		(733		)
Total adjustments to noncash assets previously acquired	$	—	$	—

See Accompanying Notes to Consolidated Financial Statements.

7

MB FINANCIAL, INC. & SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 1.    Basis of Presentation

These unaudited consolidated financial statements include the accounts of MB Financial, Inc., a Maryland corporation (the “Company”), and its subsidiaries, including its wholly owned national bank subsidiary, MB Financial Bank, N.A. (“MB Financial Bank”), based in Chicago, Illinois. In the opinion of management, all normal recurring adjustments necessary for a fair presentation of the financial condition, results of operations and cash flows for the interim periods have been made. The results of operations for the nine months endedSeptember 30, 2018 are not necessarily indicative of the results to be expected for the entire fiscal year.

These unaudited interim financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and industry practice. Certain information in footnote disclosure normally included in financial statements prepared in accordance with U.S. GAAP and industry practice has been condensed or omitted pursuant to rules and regulations of the Securities and Exchange Commission. These financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017.

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions which affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements, as well as the reported amounts of income and expenses during the reported periods. Actual results could differ from those estimates.

Certain prior period amounts have been reclassified to conform to current period presentation. These reclassifications did not result in any changes to previously reported net income or stockholders’ equity.

Note 2. New Authoritative Accounting Guidance

ASC Topic 805 "Business Combinations." New authoritative accounting guidance under ASC Topic 805 "Business Combinations" amends prior guidance to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 606 "Revenue from Contracts with Customers." New authoritative accounting guidance under ASC Topic 606, "Revenue from Contracts with Customers" amended prior guidance to require an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The new authoritative guidance was initially effective for reporting periods after January 1, 2017 but was deferred to January 1, 2018. The Company's revenue is comprised of interest income on financial assets, which is excluded from the scope of this new guidance, and non-interest income. This new guidance changes how certain recurring revenue streams are recognized within lease financing revenue and insignificant components of non-interest income. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition. See "Accounting changes" below.

ASC Topic 825 "Financial Instruments." New authoritative accounting guidance under ASC Topic 825 "Financial Instruments" amended prior guidance to require equity investments (except those accounted for under the equity method of accounting) to be measured at fair value with changes in fair value recognized in net income. An entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer. The new guidance simplifies the impairment assessment of equity investments without readily determinable fair values, requires public entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from changes in the instrument-specific credit risk when the entity has selected the fair value option for financial instruments and requires separate presentation of financial assets and liabilities by measurement category and form of financial asset. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition. See "Accounting changes" below.

8

ASC Topic 405 "Liabilities-Extinguishment of Liabilities." New authoritative accounting guidance under ASC Topic 405, "Liabilities-Extinguishment of Liabilities" amended prior guidance to clarify that liabilities related to the sale of prepaid store-value products within the scope of this guidance are financial liabilities and that breakage for those liabilities are to be accounted for consistent with the breakage guidance in ASC Topic 606 "Revenue from Contracts with Customers." The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 842 "Leases." New authoritative accounting guidance under ASC Topic 842 "Leases" amended prior guidance to require lessees to recognize the assets and liabilities arising from all leases on the balance sheet. The new authoritative guidance defines a lease as a contract, or part of a contract, that conveys the right to control the use of identified property, plant, or equipment (an identified asset) for a period of time in exchange for consideration. In addition, the qualifications for a sale and leaseback transaction have been amended. The new authoritative guidance also requires qualitative and quantitative disclosures bylessees and lessors to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The new authoritative guidance will be effective for reporting periods after January 1, 2019. In July 2018, the Financial Accounting Standards Board issued new authoritative guidance to provide an additional transition method that allows entities to not apply this new guidance in the comparative periods presented in the financial statements and instead recognize a cumulative effect adjustment to the beginning retained earnings at the date of application. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition. The Company expects an increase in assets and liabilities as a result of recording additional lease contracts where the Company is lessee and expects to adopt the new guidance prospectively as of January 1, 2019 and to not restate comparative periods.

ASC Topic 815 "Derivatives and Hedging." New authoritative accounting guidance under ASC Topic 815 "Derivatives and Hedging" amended prior guidance to better align an entity's risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. The new authoritative guidance expands and refines hedge accounting for both nonfinancial and financial risk components. The new authoritative guidance will be effective for reporting periods after January 1, 2019 with early adoption permitted. In October 2018, the Financial Accounting Standards Board issued new authoritative guidance to permit the use of the Overnight Index Swap rate based on Secured Overnight Financing Rate as a U.S. benchmark interest rate for hedge accounting purposes. This new authoritative guidance is not expected to have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 718 "Compensation - Stock Compensation." New authoritative accounting guidance under ASC Topic 718 "Compensation - Stock Compensation" amends prior guidance by clarifying which changes to terms or conditions of a share-based payment award require an entity to apply modification accounting. An entity should account for the effects of a modification unless the fair value, vesting conditions and classification of the modified award are the same as the original award. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 326 "Financial Instruments - Credit Losses." New authoritative accounting guidance under ASC Topic 326 "Financial Instruments - Credit Losses" amended the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information for credit loss estimates. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The new authoritative guidance also requires a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected (net of the allowance for credit losses). In addition, the credit losses relating to available-for-sale debt securities should be recorded through an allowance for credit losses rather than a write-down. The new authoritative guidance will be effective for reporting periods after January 1, 2020. The Company is evaluating the new guidance and expects it to have an impact on the Company's statements of operations and financial condition, the significance of which is not yet known nor can it be reasonably estimated currently. Due to the significant differences in the new authoritative guidance from existing GAAP, the implementation of this guidance may result in material changes in our accounting for credit losses on financial instruments and will be impacted by the Company's loan and securities portfolios' composition, attributes, and quality in addition to prevailing economic conditions and forecasts at the time of adoption. As part of the Company's evaluation process, it had established a steering committee and working group, including individuals from various functional areas, to assess processes and related controls, portfolio segmentation, model development, system requirements, and needed resources, however, due to the pending merger with Fifth Third Bancorp, the Company has changed its evaluation process to incorporate the transition of the Company's assets to Fifth Third Bancorp.

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ASC Topic 230 "Statement of Cash Flows." New authoritative accounting guidance under ASC Topic 230 "Statement of Cash Flows" addresses eight specific cash flow classification issues with the objective of reducing the existing diversity in practice. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

New authoritative accounting guidance under ASC Topic 230 "Statement of Cash Flows" amends prior guidance to require an entity to include amounts generally described as restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning of period and end of period total amounts shown on the statement of cash flows. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 740 "Income Taxes." New authoritative accounting guidance under ASC Topic 740 "Income Taxes" amends prior guidance to require an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 350 "Intangibles-Goodwill and Other." New authoritative accounting guidance under ASC Topic 350 "Intangibles-Goodwill and Other" amends prior guidance to eliminate Step 2 from the goodwill impairment test and require an entity to perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new authoritative guidance will be effective for reporting periods after January 1, 2020. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition.

ASC Topic 610 "Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets." New authoritative accounting guidance under ASC Topic 610 "Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets" amends prior guidance to clarify the scope of Subtopic 610-20 by defining in substance nonfinancial assets and to add guidance for partial sales of nonfinancial assets. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 310 "Receivables - Nonrefundable Fees and Other Costs." New authoritative accounting guidance under ASC Topic 310 "Receivables - Nonrefundable Fees and Other Costs" amends prior guidance by shortening the amortization period for certain callable debt securities held at a premium requiring the premium to be amortized to the earliest call date. The new authoritative guidance will be effective for reporting periods after January 1, 2019 with early adoption permitted. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition.

ASC Topic 220 "Income Statement - Reporting Comprehensive Income." New authoritative accounting guidance under ASC Topic 220 "Income Statement - Reporting Comprehensive Income" allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from enactment of H.R. 1, originally known as the "Tax Cuts and Jobs Act." The new authoritative guidance will be effective for reporting periods after January 1, 2019 with early adoption permitted. The Company early adopted the new guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition. See "Accounting changes" below.

ASC Topic 820 "Fair Value Measurement." New authoritative accounting guidance under ASC Topic 820 "Fair Value Measurement" amends prior guidance to modify the disclosure requirements. The new authoritative guidance removes the requirement to disclose the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, the policy for timing of transfers between levels, the valuation processes for Level 3 fair value measurements. It also adds the requirement to disclose the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. The new authoritative guidance will be effective for reporting periods after January 1, 2020 with early adoption permitted. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition.

Accounting changes. The Company adopted the new authoritative accounting guidance under ASC Topic 606, "Revenue from Contracts with Customers" on January 1, 2018 using the modified retrospective transition method for contracts that were not completed at the date of initial application. The Company recognized a cumulative effect reduction to the beginning retained earnings totaling $683 thousand. This amount relates to lease financing revenue where the Company's performance obligation is over time. Previously, such revenue was recognized immediately. See "Lease financing revenue, net" below.

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The new authoritative accounting guidance under ASC Topic 606 requires an entity to recognize revenue in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. To achieve this, the Company takes the following steps: identify the contract(s) with a customer; identify the performance obligations in the contract; determine the transaction price; allocate the transaction price to the performance obligations in the contract; and recognize revenue when (or as) the Company satisfies a performance obligation. The non-interest revenue streams that are considered to be in the scope of this new guidance are discussed below.

Lease financing revenue, net. Fees from the sale of third-party equipment maintenance contracts are included within lease financing revenue, net. The Company sells third-party equipment maintenance contracts and provides customers with an asset and maintenance contract management tool over the life of the maintenance contract. Since the Company provides support for the asset and maintenance contract management tool, the Company's performance obligation is satisfied over the life of the maintenance contract, and the fees are recognized monthly over the life of the maintenance contract. Payment is typically received at the time of sale of the maintenance contract.

Treasury management fees and consumer and other deposit service fees. Deposit related fees (account analysis fees, monthly service fees, and other related fees) are included within treasury management fees and consumer and other deposit service fees. The Company's performance obligation is ongoing and either party may cancel at any time. These fees are generally recognized as the services are rendered on a monthly basis. Payment is typically received monthly.

Wealth management fees. Wealth management fees include revenue from the management and advisement of client assets and trust administration. The Company's performance obligation is generally satisfied over time, and the fees are recognized monthly. Payment is typically received quarterly or annually.

Card fees. Card fees include debit and credit card interchange fees and ATM fees. For debit and credit card transactions, the Company considers the merchant as the customer for interchange revenue with the performance obligation being satisfied when the cardholder purchases goods or services from the merchant. Interchange revenue is recognized as the services are provided. The Company's performance obligation for ATM fees is satisfied when services are provided, and the fees are recognized at that time. Payment is typically received immediately or in the following month.

Capital markets and international banking fees. Capital markets and international banking fees include M&A advisory and syndication fees. The Company's performance obligation is generally satisfied over time, and the fees are recognized monthly. For M&A advisory fees, a portion of the payment is received at the beginning of the engagement with the remainder received once the transaction is completed. For syndication fees, payment is received annually.

The Company also adopted the new authoritative accounting guidance under ASC Topic 825 "Financial Instruments" and ASC Topic 220 "Income Statement - Reporting Comprehensive Income" on January 1, 2018. The Company recognized a cumulative effect increase to the beginning retained earnings and accumulated other comprehensive income totaling $385 thousand under ASC Topic 825 representing the fair value adjustment to equity securities at the date of initial application. In addition, the Company reclassified $729 thousand from accumulated other comprehensive loss to retained earnings for the stranded tax effects resulting from enactment of the Tax Cuts and Jobs Act at the date of initial application of the new guidance under ASC Topic 220.

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Note 3.   Earnings Per Common Share

Earnings per common share is computed using the two-class method. Basic earnings per common share is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding during the applicable period, excluding outstanding participating securities. Participating securities include non-vested restricted stock awards and restricted stock units, though no actual shares of common stock related to restricted stock units are issued until the settlement of such units, to the extent holders of these securities receive non-forfeitable dividends or dividend equivalents at the same rate as holders of the Company's common stock. Diluted earnings per common share is computed using the weighted-average number of shares determined for the basic earnings per common share computation plus the dilutive effect of stock compensation using the treasury stock method.

The following table presents a reconciliation of the number of shares used in the calculation of basic and diluted earnings per common share (amounts in thousands, except share and per share data).

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Distributed earnings allocated to common stock	$	20,468	$	17,823	$	61,223	$	51,783
Undistributed earnings	22,246		43,020		76,781		108,063
Net income	42,714		60,843		138,004		159,846
Less: preferred stock dividends	3,000		2,002		9,100		6,007
Plus: return from preferred stockholders due to redemption (1)	—		—		15,280		—
Net income available to common stockholders for basic earnings per common share	39,714		58,841		144,184		153,839
Plus: preferred stock dividends on convertible preferred stock	—		2		—		7
Less: earnings allocated to participating securities	1		1		4		3
Earnings allocated to common stockholders for diluted earnings per common share	$	39,713	$	58,842	$	144,180	$	153,843
Weighted average shares outstanding for basic earnings per common share	84,369,519		83,891,175		84,230,835		83,799,694
Dilutive effect of:
Stock options	463,024		502,794		508,270		564,541
Restricted shares and units	502,566		379,684		423,115		404,850
Convertible preferred stock	—		6,144		—		6,867
Total dilutive effect of equity awards and convertible preferred stock	965,590		888,622		931,385		976,258
Weighted average shares outstanding for diluted earnings per common share	85,335,109		84,779,797		85,162,220		84,775,952
Basic earnings per common share	$	0.47	$	0.70	$	1.71	$	1.84
Diluted earnings per common share	0.47		0.69		1.69		1.81

⁽¹⁾  Represents the excess carrying amount over the redemption price of the 8% Series A non-cumulative perpetual preferred stock redeemed in the first quarter of 2018.

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Note 4. Investment Securities

Amortized cost and fair value of investment securities, excluding marketable equity securities and non-marketable FHLB and FRB stock, were as follows as of the dates indicated (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
September 30, 2018
Available for Sale
U.S. Government sponsored agencies and enterprises	$	5,087	$	—	$	(85	)	$	5,002
States and political subdivisions	335,034		8,928		(706		)	343,256
Residential mortgage-backed securities	1,344,270		1,209		(29,205		)	1,316,274
Commercial mortgage-backed securities	41,070		62		(92		)	41,040
Corporate bonds	5,065		—		(1		)	5,064
Total Available for Sale	1,730,526		10,199		(30,089		)	1,710,636
Held to Maturity
States and political subdivisions	899,865		12,991		(3,562		)	909,294
Residential mortgage-backed securities	23,217		245		—			23,462
Total Held to Maturity	923,082		13,236		(3,562		)	932,756
Total	$	2,653,608	$	23,435	$	(33,651	)	$	2,643,392
December 31, 2017
Available for Sale
U.S. Government sponsored agencies and enterprises	$	23,013	$	3	$	(9	)	$	23,007
States and political subdivisions	363,813		15,998		(486		)	379,325
Residential mortgage-backed securities	861,594		3,035		(11,930		)	852,699
Commercial mortgage-backed securities	71,554		612		(131		)	72,035
Corporate bonds	70,155		84		(42		)	70,197
Equity securities (1)	11,236		—		(173		)	11,063
Total Available for Sale	1,401,365		19,732		(12,771		)	1,408,326
Held to Maturity
States and political subdivisions	878,400		32,559		(447		)	910,512
Residential mortgage-backed securities	80,682		1,261		—			81,943
Total Held to Maturity	959,082		33,820		(447		)	992,455
Total	$	2,360,447	$	53,552	$	(13,218	)	$	2,400,781

⁽¹⁾  Reflected in marketable equity securities on the consolidated balance sheet following the adoption of the new guidance under ASC Topic 825 "Financial Instruments" on January 1, 2018.

The increase in investment securities was due to investments in residential mortgage-backed securities in the nine months ended September 30, 2018. The Company has no direct exposure to the State of Illinois in its investment securities portfolio, but approximately 20% of the state and political subdivisions portfolio consisted of securities issued by municipalities located in Illinois as of September 30, 2018. Approximately 95% of the state and political subdivisions securities were general obligation issues, and 27% were insured or had another form of credit enhancement as of September 30, 2018.

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Unrealized losses on investment securities by length of time in a continuous unrealized loss position and the fair value of the related securities at September 30, 2018 were as follows (in thousands):

	Less Than 12 Months					12 Months or More					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
	Value		Losses			Value		Losses			Value		Losses
Available for Sale
U.S. Government sponsored agencies and enterprises	$	5,002	$	(85	)	$	—	$	—		$	5,002	$	(85	)
States and political subdivisions	27,107		(140		)	18,453		(566		)	45,560		(706		)
Residential mortgage-backed securities	765,346		(11,848		)	411,324		(17,357		)	1,176,670		(29,205		)
Commercial mortgage-backed securities	16,989		(46		)	11,713		(46		)	28,702		(92		)
Corporate bonds	5,064		(1		)	—		—			5,064		(1		)
Total Available for Sale	819,508		(12,120		)	441,490		(17,969		)	1,260,998		(30,089		)
Held to Maturity
States and political subdivisions	289,842		(2,824		)	16,463		(738		)	306,305		(3,562		)
Total	$	1,109,350	$	(14,944	)	$	457,953	$	(18,707	)	$	1,567,303	$	(33,651	)

Unrealized losses on investment securities by length of time in a continuous unrealized loss position and the fair value of the related securities at December 31, 2017 were as follows (in thousands):

	Less Than 12 Months					12 Months or More					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
	Value		Losses			Value		Losses			Value		Losses
Available for Sale
U.S. Government sponsored agencies and enterprises	$	5,111	$	(9	)	$	—	$	—		$	5,111	$	(9	)
States and political subdivisions	9,016		(29		)	18,754		(457		)	27,770		(486		)
Residential mortgage-backed securities	256,769		(1,853		)	407,224		(10,077		)	663,993		(11,930		)
Commercial mortgage-backed securities	19,483		(20		)	14,583		(111		)	34,066		(131		)
Corporate bonds	7,052		(8		)	9,963		(34		)	17,015		(42		)
Equity securities	11,063		(173		)	—		—			11,063		(173		)
Total Available for Sale	308,494		(2,092		)	450,524		(10,679		)	759,018		(12,771		)
Held to Maturity
States and political subdivisions	45,499		(257		)	12,561		(190		)	58,060		(447		)
Total	$	353,993	$	(2,349	)	$	463,085	$	(10,869	)	$	817,078	$	(13,218	)

The total number of security positions in the investment portfolio in an unrealized loss position at September 30, 2018 was 761 compared to 471 at December 31, 2017. The increase in the total number of security positions in a continuous unrealized loss position and the increase in the unrealized losses from December 31, 2017 to September 30, 2018 was due to the increases in market interest rates. Changes in market interest rates can significantly influence the fair value of securities, and the fair value of our municipal securities portfolio would decline substantially if interest rates increase materially.

Declines in the fair value of available for sale securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses to the extent the impairment is related to credit losses. The amount of the impairment related to other factors is recognized in other comprehensive income. In estimating other-than-temporary impairment losses, management considers, among other things, (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, and (iii) whether the Company is more likely than not to sell the security before recovery of its cost basis.

As of September 30, 2018, management does not have the intent to sell any of the securities in the table above and believes that it is more likely than not that the Company will not have to sell any such securities before a recovery of cost. The fair value is

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expected to recover as the securities approach their maturity date or repricing date or if market yields for such investments decline. Accordingly, as of September 30, 2018, management believes the impairments detailed in the table above are temporary.

Net gains (losses) recognized on investment securities were as follows (in thousands):

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2018			2017		2018			2017
Realized gains	$	42		$	83	$	192		$	457
Realized losses	(127		)	—		(537		)	(6		)
Net (losses) gains	$	(85	)	$	83	$	(345	)	$	451

The amortized cost and fair value of investment securities as of September 30, 2018 by contractual maturity are shown below. Maturities may differ from contractual maturities in mortgage-backed securities because the mortgages underlying the securities may be called or repaid without any penalties. Therefore, mortgage-backed securities are not included in the maturity categories in the following maturity summary.

	Amortized		Fair
(In thousands)	Cost		Value
Available for sale:
Due in one year or less	$	44,036	$	44,350
Due after one year through five years	128,692		131,525
Due after five years through ten years	39,263		39,458
Due after ten years	133,195		137,989
Residential and commercial mortgage-backed securities	1,385,340		1,357,314
	1,730,526		1,710,636
Held to maturity:
Due in one year or less	66,747		67,040
Due after one year through five years	150,122		154,149
Due after five years through ten years	230,783		234,855
Due after ten years	452,213		453,250
Residential mortgage-backed securities	23,217		23,462
	923,082		932,756
Total	$	2,653,608	$	2,643,392

Investment securities with a carrying amount of $794.1 million at September 30, 2018 and $726.1 million at December 31, 2017 were pledged as collateral on public deposits and for other purposes as required or permitted by law, while only $710.4 million and $625.2 million were required to be pledged at September 30, 2018 and December 31, 2017, respectively.

Investment securities held to maturity with a carrying amount of $2.6 million were transferred to the available for sale portfolio and subsequently sold during the first quarter of 2018. These investment securities were obligations of states and political subdivisions that were downgraded and no longer met our credit criteria.

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Note 5. Loans

Loans consist of the following at (in thousands):

	September 30, 2018		December 31, 2017
Commercial loans	$	4,936,536	$	4,786,180
Commercial loans collateralized by assignment of lease payments	2,065,588		2,113,135
Commercial real estate	3,832,032		4,147,529
Residential real estate	1,403,087		1,432,458
Construction real estate	548,882		406,849
Indirect vehicle	790,573		667,928
Home equity	181,477		219,098
Other consumer loans	85,705		73,141
Total loans, excluding purchased credit-impaired loans	13,843,880		13,846,318
Purchased credit-impaired loans	91,072		119,744
Total loans	$	13,934,952	$	13,966,062

Loans are made to individuals as well as commercial and tax exempt entities. Specific loan terms vary as to interest rate, repayment, and collateral requirements based on the type of loan requested and the credit worthiness of the prospective borrower. Except for commercial loans collateralized by assignment of lease payments, asset-based loans, residential real estate loans, and indirect vehicle loans, credit risk tends to be geographically concentrated in that a majority of the loan customers are located in Illinois.

The Company's extension of credit is governed by its Credit Risk Policy, which was established to control the quality of the Company's loans. This policy is reviewed and approved by the Enterprise Risk Committee of the Company's Board of Directors on an annual basis.

Commercial Loans. Commercial credit is extended mostly to middle market customers. Such credits are typically comprised of working capital loans, loans for physical asset expansion, asset acquisition loans and other business loans. Loans to closely held businesses will generally be guaranteed in full or for a significant amount by the businesses' principal owners. Commercial loans are made based primarily on the historical cash flow of the borrower and secondarily on the underlying collateral provided by the borrower. The cash flows of borrowers, however, may not perform as forecasted and collateral securing loans may fluctuate in value due to economic or individual performance factors. Minimum standards and underwriting guidelines have been established for all commercial loan types. Asset-based loans, also included in commercial loans, are made to businesses with the primary source of repayment derived from payments on the related assets securing the loan. Collateral for these loans may include accounts receivable, inventory and equipment, and is monitored regularly to ensure ongoing sufficiency of collateral coverage and quality. The primary risk for these loans is a significant decline in collateral values due to general market conditions. Loan terms that mitigate these risks include typical industry amortization schedules, percentage of collateral advances, maintenance of cash collateral accounts and regular asset monitoring. Because of the national scope of our asset-based lending, the risk of these loans is also diversified by geography.

Commercial Loans Collateralized by Assignment of Lease Payments ("Lease Loans"). The Company makes lease loans to lessors where the underlying leases are with both investment grade and non-investment grade companies. Investment grade lessees are companies rated in one of the four highest categories by Moody's Investor Services. Whether or not companies fall into this category, each lease loan is considered on its individual merit based on the financial wherewithal of the lessee using financial information available at the time of underwriting. In addition, leases that transfer substantially all of the benefits and risk related to the equipment ownership are classified as direct finance leases and are included in lease loans.

Commercial Real Estate Loans. Commercial real estate loans are subject to underwriting standards and processes similar to commercial loans. These loans are viewed primarily as property income based loans and the repayment of these loans is largely dependent on the successful operation of the property, which also serves as collateral for the loan. In addition, $1.2 billion of commercial real estate loans at September 30, 2018 were secured by owner-occupied properties where the primary source of repayment is the cash flow from the ongoing operations and activities conducted by the owner of the property. Loan performance may be adversely affected by factors impacting the general economy or conditions specific to the real estate market such as geographic location and/or property type.

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Construction Real Estate Loans. The Company defines construction loans as loans where the loan proceeds are monitored by the Company and used exclusively for the improvement of real estate in which the Company holds a mortgage. Due to the inherent risk in this type of loan, these loans are subject to other industry specific policy guidelines outlined in the Company's Credit Risk Policy.

Consumer Related Loans. The Company originates direct and indirect consumer loans, including residential real estate, home equity lines and loans, credit cards, and indirect vehicle loans (motorcycle, marine, recreational, and powersports vehicles). Each loan type is underwritten based upon several factors including debt to income, type of collateral and loan to collateral value, credit history, and the Company's relationship with the borrower. Indirect loan and credit card underwriting involves the use of risk-based pricing in the underwriting process.

Purchased credit-impaired loans. Purchased credit-impaired loans are accounted for under ASC Topic 310-30, which include purchased credit-impaired loans acquired through business combinations, FDIC-assisted transactions, and repurchase transactions with the Government National Mortgage Association ("GNMA"). The loans repurchased from GNMA were originally sold by the Company with servicing retained and subsequently became delinquent. These loans are also insured by the Federal Housing Administration (commonly referred to as "FHA") or the U.S. Department of Veterans Affairs (commonly referred to as "VA") where the Company would be able to recover the principal balance of these loans. All repurchases from GNMA are at the Company's discretion.

Pledged loans. A collateral pledge agreement exists whereby at all times, the Company must keep on hand, free of all other pledges, liens, and encumbrances, loans with unpaid principal balances aggregating no less than 160% for qualifying first mortgage loans, 170% for home equity loans, 157% for qualifying commercial real estate loans and 105% for loans held for sale, of the outstanding advances from the Federal Home Loan Bank.  As of September 30, 2018 and December 31, 2017, the Company had $3.9 billion and $4.7 billion, respectively, of loans pledged as collateral for long-term Federal Home Loan Bank advances and third party letters of credit, while only $3.1 billion were required to be pledged at September 30, 2018 and December 31, 2017. The Company also has a collateral pledge agreement with the Federal Reserve Bank. As of September 30, 2018 and December 31, 2017, the Company had $859.0 million and $902.2 million, respectively, of loans pledged as collateral at the Federal Reserve Bank for the discount window as a backup liquidity funding source.

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The following table presents the contractual aging of the recorded investment in past due loans by class of loans as of September 30, 2018 and December 31, 2017 (in thousands):

	Current		30-59 Days Past Due		60-89 Days Past Due		Loans Past Due 90 Days or More		Total Past Due		Total
September 30, 2018
Commercial	$	4,927,393	$	3,487	$	1,077	$	4,579	$	9,143	$	4,936,536
Commercial collateralized by assignment of lease payments	2,032,510		29,858		2,458		762		33,078		2,065,588
Commercial real estate:
Health care	664,187		269		—		—		269		664,456
Industrial	865,914		—		—		2,811		2,811		868,725
Multifamily	503,597		128		—		529		657		504,254
Retail	479,167		413		—		819		1,232		480,399
Office	418,330		—		—		120		120		418,450
Other	887,428		2,547		175		5,598		8,320		895,748
Residential real estate	1,388,338		659		2,610		11,480		14,749		1,403,087
Construction real estate	548,882		—		—		—		—		548,882
Indirect vehicle	783,161		4,747		1,847		818		7,412		790,573
Home equity	175,747		2,650		836		2,244		5,730		181,477
Other consumer	85,284		169		113		139		421		85,705
Total loans, excluding purchased credit-impaired loans	13,759,938		44,927		9,116		29,899		83,942		13,843,880
Purchased credit-impaired loans	53,843		2,809		3,904		30,516		37,229		91,072
Total loans	$	13,813,781	$	47,736	$	13,020	$	60,415	$	121,171	$	13,934,952
Non-performing loan aging	$	39,737	$	2,932	$	1,163	$	29,899	$	33,994	$	73,731
December 31, 2017
Commercial	$	4,769,244	$	1,702	$	6,926	$	8,308	$	16,936	$	4,786,180
Commercial collateralized by assignment of lease payments	2,099,246		11,320		1,878		691		13,889		2,113,135
Commercial real estate:
Health care	710,722		—		—		—		—		710,722
Industrial	908,394		—		—		755		755		909,149
Multifamily	601,844		688		—		732		1,420		603,264
Retail	503,224		—		—		474		474		503,698
Office	453,960		—		956		1,454		2,410		456,370
Other	956,181		7,035		76		1,034		8,145		964,326
Residential real estate	1,410,473		12,359		1,907		7,719		21,985		1,432,458
Construction real estate	404,595		2,254		—		—		2,254		406,849
Indirect vehicle	661,028		4,905		1,083		912		6,900		667,928
Home equity	210,831		3,161		1,073		4,033		8,267		219,098
Other consumer	72,846		202		36		57		295		73,141
Total loans, excluding purchased credit-impaired loans	13,762,588		43,626		13,935		26,169		83,730		13,846,318
Purchased credit-impaired loans	63,937		8,749		3,997		43,061		55,807		119,744
Total loans	$	13,826,525	$	52,375	$	17,932	$	69,230	$	139,537	$	13,966,062
Non-performing loan aging	$	36,879	$	8,799	$	4,961	$	26,169	$	39,929	$	76,808

18

The following table presents the recorded investment in non-accrual loans and loans past due ninety days or more and still accruing by class of loans, excluding purchased credit-impaired loans, as of September 30, 2018 and December 31, 2017 (in thousands):

	September 30, 2018				December 31, 2017
			Loans past due				Loans past due
	Non-accrual		90 days or more and still accruing		Non-accrual		90 days or more and still accruing
Commercial	$	24,086	$	—	$	14,001	$	3,500
Commercial collateralized by assignment of lease payments	630		662		490		531
Commercial real estate:
Health care	—		—		—		—
Industrial	2,811		—		8,807		—
Multifamily	568		—		860		—
Office	432		—		2,772		—
Retail	819		—		590		—
Other	5,887		39		8,016		190
Residential real estate	20,080		381		18,374		1,210
Construction real estate	—		—		—		—
Indirect vehicle	4,051		73		3,019		81
Home equity	13,068		—		14,305		—
Other consumer	5		139		4		58
Total	$	72,437	$	1,294	$	71,238	$	5,570

The Company utilizes an internal asset classification system as a means of reporting problem and potential problem loans. Under the Company's risk rating system, the Company classifies potential problem and problem loans as “Special Mention,” “Substandard,” and “Doubtful.” Substandard loans include those characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Loans classified as Doubtful have all the weaknesses inherent in those classified as Substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. Loans that do not currently expose the Company to sufficient risk to warrant classification in one of the aforementioned categories but possess weaknesses that deserve management's close attention are deemed to be Special Mention. Loans rated but not adversely classified are deemed to be Pass. Risk ratings are updated any time the situation warrants and at least annually.

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Loans not rated are included in groups of homogeneous loans with similar risk and loss characteristics and are not included in the table below. The following tables present the risk category of loans by class of loans based on the most recent analysis performed, excluding purchased credit-impaired loans, as of September 30, 2018 and December 31, 2017 (in thousands):

	Pass		Special Mention		Substandard		Doubtful		Total
September 30, 2018
Commercial	$	4,627,512	$	161,909	$	147,115	$	—	$	4,936,536
Commercial collateralized by assignment of lease payments	2,051,164		8,422		6,002		—		2,065,588
Commercial real estate:
Health care	544,562		49,515		70,379		—		664,456
Industrial	840,860		14,820		13,045		—		868,725
Multifamily	500,369		606		3,279		—		504,254
Retail	457,416		19,862		3,121		—		480,399
Office	408,532		1,964		7,954		—		418,450
Other	857,001		10,463		28,284		—		895,748
Construction real estate	546,012		1,645		1,225		—		548,882
Total	$	10,833,428	$	269,206	$	280,404	$	—	$	11,383,038
December 31, 2017
Commercial	$	4,535,111	$	147,232	$	103,837	$	—	$	4,786,180
Commercial collateralized by assignment of lease payments	2,095,668		7,527		9,940		—		2,113,135
Commercial real estate:
Health care	640,751		33,672		36,299		—		710,722
Industrial	885,524		12,411		11,214		—		909,149
Multifamily	595,818		146		7,300		—		603,264
Retail	492,830		8,326		2,542		—		503,698
Office	452,902		696		2,772		—		456,370
Other	891,703		37,682		34,941		—		964,326
Construction real estate	406,849		—		—		—		406,849
Total	$	10,997,156	$	247,692	$	208,845	$	—	$	11,453,693

Approximately $35.3 million and $35.6 million of the substandard loans were non-performing as of September 30, 2018 and December 31, 2017, respectively.

For residential real estate, home equity, indirect vehicle and other consumer loan classes, the Company also evaluates credit quality based on the aging status of the loan, which was previously presented, and by payment activity. The following table presents the recorded investment in those loan classes based on payment activity, excluding purchased credit-impaired loans, as of September 30, 2018 and December 31, 2017 (in thousands):

	Performing		Non-performing		Total
September 30, 2018
Residential real estate	$	1,382,626	$	20,461	$	1,403,087
Indirect vehicle	786,449		4,124		790,573
Home equity	168,409		13,068		181,477
Other consumer	85,561		144		85,705
Total	$	2,423,045	$	37,797	$	2,460,842
December 31, 2017
Residential real estate	$	1,412,874	$	19,584	$	1,432,458
Indirect vehicle	664,828		3,100		667,928
Home equity	204,793		14,305		219,098
Other consumer	73,079		62		73,141
Total	$	2,355,574	$	37,051	$	2,392,625

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The recorded investment in residential mortgage loans secured by residential real estate properties (including purchased credit-impaired loans) for which foreclosure proceedings are in process totaled $53.7 million and $43.6 million at September 30, 2018 and December 31, 2017, respectively.

The following tables present loans individually evaluated for impairment by class of loans, excluding purchased credit-impaired loans, as of September 30, 2018 and December 31, 2017 (in thousands):

	September 30, 2018
									Three Months Ended				Nine Months Ended
	Unpaid Principal Balance		Recorded Investment		Partial Charge-offs		Allowance for Loan Losses Allocated		Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial	$	35,407	$	14,641	$	20,766	$	—	$	17,634	$	222	$	10,430	$	222
Commercial collateralized by assignment of lease payments	—		—		—		—		—		—		—		—
Commercial real estate:
Health care	—		—		—		—		—		—		—		—
Industrial	3,426		2,811		615		—		3,491		—		1,176		—
Multifamily	—		—		—		—		—		—		—		—
Retail	—		—		—		—		—		—		—		—
Office	—		—		—		—		—		—		—		—
Other	—		—		—		—		—		—		1,096		52
Residential real estate	3,847		3,809		38		—		2,260		—		3,261		—
Construction real estate	—		—		—		—		—		—		—		—
Indirect vehicle	775		449		326		—		853		3		660		31
Home equity	79		79		—		—		79		—		27		—
Other consumer	—		—		—		—		—		—		—		—
With an allowance recorded:
Commercial	7,996		7,996		—		797		8,559		85		6,147		182
Commercial collateralized by assignment of lease payments	—		—		—		—		—		—		110		—
Commercial real estate:
Health care	—		—		—		—		—		—		357		28
Industrial	—		—		—		—		—		—		2,126		8
Multifamily	—		—		—		—		—		—		—		—
Retail	—		—		—		—		—		—		—		—
Office	—		—		—		—		—		—		—		—
Other	4,766		4,766		—		438		4,894		—		3,032		124
Residential real estate	19,604		17,591		2,013		1,621		17,590		—		18,496		32
Construction real estate	—		—		—		—		—		—		—		—
Indirect vehicle	—		—		—		—		—		—		—		—
Home equity	29,741		26,890		2,851		1,534		27,102		—		28,563		30
Other consumer	—		—		—		—		—		—		—		—
Total	$	105,641	$	79,032	$	26,609	$	4,390	$	82,462	$	310	$	75,481	$	709

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	December 31, 2017
									Year Ended
	Unpaid Principal Balance		Recorded Investment		Partial Charge-offs		Allowance for Loan Losses Allocated		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial	$	8,312	$	7,771	$	541	$	—	$	5,595	$	95
Commercial collateralized by assignment of lease payments	—		—		—		—		301		—
Commercial real estate:
Health care	—		—		—		—		—		—
Industrial	—		—		—		—		1,260		8
Multifamily	—		—		—		—		1,261		29
Retail	—		—		—		—		814		27
Office	527		527		—		—		1,426		18
Other	10,597		10,597		—		—		2,312		128
Residential real estate	1,950		1,912		38		—		483		—
Construction real estate	—		—		—		—		—		—
Indirect vehicle	408		202		206		—		411		26
Home equity	81		81		—		—		376		—
Other consumer	—		—		—		—		—		—
With an allowance recorded:
Commercial	7,418		7,418		—		2,315		7,668		277
Commercial collateralized by assignment of lease payments	—		—		—		—		126		14
Commercial real estate:
Health care	—		—		—		—		—		—
Industrial	8,339		8,317		22		2,669		3,215		171
Multifamily	568		568		—		320		426		—
Retail	—		—		—		—		1,345		28
Office	2,293		2,277		16		752		636		4
Other	—		—		—		—		29		—
Residential real estate	21,380		19,014		2,366		2,158		17,616		25
Construction real estate	—		—		—		—		—		—
Indirect vehicle	—		—		—		—		—		—
Home equity	30,762		28,286		2,476		2,200		27,982		54
Other consumer	—		—		—		—		—		—
Total	$	92,635	$	86,970	$	5,665	$	10,414	$	73,282	$	904

Impaired loans included accruing restructured loans of $23.0 million and $28.6 million that have been modified and are performing in accordance with those modified terms as of September 30, 2018 and December 31, 2017, respectively.  In addition, impaired loans included $24.0 million and $30.8 million of non-performing restructured loans as of September 30, 2018 and December 31, 2017, respectively.

Loans may be restructured in an effort to maximize collections from financially distressed borrowers. We use various restructuring techniques, including, but not limited to, deferring past due interest or principal, implementing an A/B note structure, redeeming past due taxes, reducing interest rates, extending maturities and modifying amortization schedules. Residential real estate loans are restructured in an effort to minimize losses while allowing borrowers to remain in their primary residences when possible.

A loan classified as a troubled debt restructuring will no longer be included in the troubled debt restructuring disclosures in the years after the restructuring if the loan performs in accordance with the terms specified by the restructuring agreement and the interest rate specified in the restructuring agreement represents a market rate at the time of modification. The specified interest rate is considered a market rate when the interest rate is equal to or greater than the rate the Company is willing to accept at the

22

time of restructuring for a new loan with comparable risk. If there are concerns that the borrower will not be able to meet the modified terms of the loan, the loan will continue to be included in the troubled debt restructuring disclosures.

Impairment analyses on commercial-related loans classified as troubled debt restructurings are performed in conjunction with the normal allowance for loan and lease losses process. Consumer loans classified as troubled debt restructurings are aggregated in two pools that share common risk characteristics, home equity and residential real estate loans, with impairment measured on a quarterly basis based on the present value of expected future cash flows discounted at the loan's effective interest rate.

The following table presents loans that were restructured during the three months ended September 30, 2018 (dollars in thousands):

	September 30, 2018
	Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment		Charge-offs and Specific Reserves
Performing:
Residential real estate	1	$	132	$	132	$	12
Home equity	1	91		91		5
Total	2	$	223	$	223	$	17
Non-Performing:
Commercial	1	$	750	$	750	$	—
Residential real estate	3	709		709		246
Indirect vehicle	21	151		151		110
Home equity	2	396		396		219
Total	27	$	2,006	$	2,006	$	575

The following table presents loans that were restructured during the nine months endedSeptember 30, 2018 (dollars in thousands):

	September 30, 2018
	Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment		Charge-offs and Specific Reserves
Performing:
Residential real estate	2	$	220	$	220	$	21
Home equity	1	91		91		5
Total	3	$	311	$	311	$	26
Non-Performing:
Commercial	1	$	750	$	750	$	—
Residential real estate	19	3,150		3,150		1,184
Indirect vehicle	41	272		272		148
Home equity	7	606		606		233
Total	68	$	4,778	$	4,778	$	1,565

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The following table presents loans that were restructured during the three months ended September 30, 2017 (dollars in thousands):

	September 30, 2017
	Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment		Charge-offs and Specific Reserves
Performing:
Commercial real estate:
Industrial	1	$	387	$	387	$	—
Retail	2	337		337		—
Other	2	3,555		3,555		—
Home equity	1	19		19		1
Total	6	$	4,298	$	4,298	$	1
Non-Performing:
Residential real estate	11	$	2,775	$	2,775	$	739
Indirect vehicle	20	153		153		105
Home equity	1	15		15		1
Total	32	$	2,943	$	2,943	$	845

The following table presents loans that were restructured during the nine months endedSeptember 30, 2017 (dollars in thousands):

	September 30, 2017
	Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment		Charge-offs and Specific Reserves
Performing:
Commercial	5	$	2,491	$	2,491	$	373
Commercial real estate
Industrial	3	3,174		3,174		—
Retail	2	337		337		—
Office	1	549		549		—
Other	3	3,703		3,703		—
Residential real estate	6	902		902		135
Home equity	4	97		97		7
Total	24	$	11,253	$	11,253	$	515
Non-Performing:
Commercial	2	$	676	$	676	$	—
Commercial real estate:
Multifamily	3	290		290		—
Retail	1	906		906		—
Residential real estate	28	5,155		5,155		1,182
Indirect vehicle	31	250		250		134
Home equity	4	608		608		58
Total	69	$	7,885	$	7,885	$	1,374

Of the troubled debt restructurings entered into during the past twelve months, none subsequently defaulted during the nine months endedSeptember 30, 2018.  Performing troubled debt restructurings are considered to have defaulted when they become 90 days or more past due post-restructuring or are placed on non-accrual status.

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The following table presents the troubled debt restructurings activity during the nine months endedSeptember 30, 2018 (in thousands):

	Performing			Non-performing
Beginning balance	$	28,554		$	30,836
Additions	311			4,778
Charge-offs	—			(3,057		)
Principal payments, net	(8,010		)	(6,398		)
Removals	(77		)	(8		)
Transfer to other real estate owned	—			—
Transfers in	2,970			778
Transfers out	(778		)	(2,970		)
Ending balance	$	22,970		$	23,959

Loans removed from troubled debt restructuring status are those that were restructured in a previous calendar year at a market rate of interest and have performed in compliance with the modified terms.

The following table presents the type of modification for loans that have been restructured during the nine months endedSeptember 30, 2018 (in thousands):

	September 30, 2018
	Extended
	Maturity,				Delay in
	Amortization		Extended		Payments and/or
	and Reduction		Maturity and/or		Reduction of
	of Interest Rate		Amortization		Interest Rate		Total
Commercial	$	—	$	750	$	—	$	750
Residential real estate	2,097		862		411		3,370
Indirect vehicle	—		—		272		272
Home equity	293		404		—		697
Total	$	2,390	$	2,016	$	683	$	5,089

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The following table presents the activity in the allowance for credit losses, balance in allowance for credit losses and recorded investment in loans by portfolio segment and based on impairment method as of September 30, 2018 and 2017 (in thousands):

	Commercial		Commercial collateralized by assignment of lease payments		Commercial real estate		Residential real estate			Construction real estate		Indirect vehicle			Home equity		Other consumer		Unfunded commitments		Total
September 30, 2018
Allowance for credit losses:
Three Months Ended
Beginning balance	$	40,318	$	13,095	$	65,391	$	5,732		$	26,792	$	4,738		$	4,142	$	2,582	$	1,788	$	164,578
Charge-offs	20,895		7,181		704		76			—		1,726			724		294		—		31,600
Recoveries	639		846		424		121			13		554			261		80		—		2,938
Provision	12,611		5,946		1,078		(445		)	66		(486		)	2,111		402		220		21,503
Ending balance	$	32,673	$	12,706	$	66,189	$	5,332		$	26,871	$	3,080		$	5,790	$	2,770	$	2,008	$	157,419
Nine Months Ended
Beginning balance	$	46,267	$	13,007	$	63,429	$	7,012		$	15,501	$	4,728		$	5,296	$	2,470	$	1,698	$	159,408
Charge-offs	23,831		7,897		5,801		805			—		4,878			972		954		—		45,138
Recoveries	1,143		1,246		1,515		217			443		2,397			559		399		—		7,919
Provision	9,094		6,350		7,046		(1,092		)	10,927		833			907		855		310		35,230
Ending balance	$	32,673	$	12,706	$	66,189	$	5,332		$	26,871	$	3,080		$	5,790	$	2,770	$	2,008	$	157,419
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$	797	$	—	$	438	$	1,621		$	—	$	—		$	1,534	$	—	$	754	$	5,144
Collectively evaluated for impairment	31,638		12,706		64,710		3,711			26,835		3,080			4,256		2,770		1,254		150,960
Acquired and accounted for under ASC 310-30 (1)	238		—		1,041		—			36		—			—		—		—		1,315
Total ending allowance balance	$	32,673	$	12,706	$	66,189	$	5,332		$	26,871	$	3,080		$	5,790	$	2,770	$	2,008	$	157,419
Loans:
Individually evaluated for impairment	$	22,637	$	—	$	7,577	$	21,400		$	—	$	449		$	26,969	$	—	$	—	$	79,032
Collectively evaluated for impairment	4,913,899		2,065,588		3,824,455		1,381,687			548,882		790,124			154,508		85,705		—		13,764,848
Acquired and accounted for under ASC 310-30 (1)	7,173		—		22,173		47,929			3,646		—			8,999		1,152		—		91,072
Total ending loans balance	$	4,943,709	$	2,065,588	$	3,854,205	$	1,451,016		$	552,528	$	790,573		$	190,476	$	86,857	$	—	$	13,934,952

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	Commercial			Commercial collateralized  by assignment of lease payments		Commercial real estate		Residential real estate		Construction real estate			Indirect vehicle		Home equity		Other consumer		Unfunded commitments			Total
September 30, 2017
Allowance for credit losses:
Three Months Ended
Beginning balance	$	43,783		$	12,765	$	63,247	$	8,249	$	15,263		$	3,963	$	4,750	$	2,013	$	2,264		$	156,297
Charge-offs	235			188		31		541		—			1,097		439		299		—			2,830
Recoveries	719			—		1,432		38		502			498		149		82		—			3,420
Provision	1,715			240		935		94		(707		)	1,317		422		489		12			4,517
Ending balance	$	45,982		$	12,817	$	65,583	$	7,840	$	15,058		$	4,681	$	4,882	$	2,285	$	2,276		$	161,404
Nine Months Ended
Beginning balance	$	44,661		$	12,238	$	51,807	$	5,971	$	14,758		$	3,421	$	4,689	$	1,821	$	2,476		$	141,842
Charge-offs	1,103			188		1,378		901		—			3,438		873		1,243		—			9,124
Recoveries	3,568			712		2,312		624		661			1,715		724		420		—			10,736
Provision	(1,144		)	55		12,842		2,146		(361		)	2,983		342		1,287		(200		)	17,950
Ending balance	$	45,982		$	12,817	$	65,583	$	7,840	$	15,058		$	4,681	$	4,882	$	2,285	$	2,276		$	161,404
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$	1,012		$	585	$	855	$	2,169	$	—		$	—	$	2,562	$	—	$	1,220		$	8,403
Collectively evaluated for impairment	44,879			12,232		63,868		5,671		15,023			4,681		2,320		2,285		1,056			152,015
Acquired and accounted for under ASC 310-30 (1)	91			—		860		—		35			—		—		—		—			986
Total ending allowance balance	$	45,982		$	12,817	$	65,583	$	7,840	$	15,058		$	4,681	$	4,882	$	2,285	$	2,276		$	161,404
Loans:
Individually evaluated for impairment	$	10,642		$	921	$	11,999	$	19,370	$	—		$	349	$	27,468	$	—	$	—		$	70,749
Collectively evaluated for impairment	4,783,196			2,073,294		4,082,707		1,414,225		395,794			654,864		201,258		77,372		—			13,682,710
Acquired and accounted for under ASC 310-30 (1)	13,677			—		32,063		68,071		5,183			—		11,200		1,725		—			131,919
Total ending loans balance	$	4,807,515		$	2,074,215	$	4,126,769	$	1,501,666	$	400,977		$	655,213	$	239,926	$	79,097	$	—		$	13,885,378

⁽¹⁾  Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 “Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality.”

Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date without a carryover of the related allowance for loan and lease losses. These acquired loans are segregated into three types: pass rated loans with no discount attributable to credit quality, non-impaired loans with a discount attributable at least in part to credit quality, and impaired loans with evidence of significant credit deterioration.  

• Pass rated loans (typically performing loans) are accounted for in accordance with ASC Topic 310-20 "Nonrefundable Fees and Other Costs" as these loans do not have evidence of credit deterioration since origination.

• Non-impaired loans (typically performing substandard loans) are accounted for in accordance with ASC Topic 310-30 if they display at least some level of credit deterioration since origination.

• Impaired loans (typically substandard loans on non-accrual status) are accounted for in accordance with ASC Topic 310-30 as they display significant credit deterioration since origination.

For pass rated loans (non-purchased credit-impaired loans), the difference between the estimated fair value of the loans and the principal outstanding is accreted over the remaining life of the loans.

In accordance with ASC 310-30, for both purchased non-impaired loans and purchased credit-impaired loans, the loans are pooled by loan type and the difference between contractually required payments at acquisition and the cash flows expected to be collected is referred to as the non-accretable difference. Further, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan pools when there is a reasonable expectation about the amount and timing of such cash flows.

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Substantially all of the loans acquired in FDIC-assisted transactions displayed at least some level of credit deterioration and as such are included as non-impaired and impaired loans as described immediately above.

During the nine months endedSeptember 30, 2018, there was a negative provision for credit losses of $119 thousand and net recoveries of $256 thousand in relation to purchased credit-impaired loans. There was $1.3 million and $1.2 million in allowance for loan and lease losses related to these purchased credit-impaired loans at September 30, 2018 and December 31, 2017, respectively.  The provision for credit losses and accompanying charge-offs are included in the table above.

Changes in the accretable yield for loans acquired and accounted for under ASC 310-30 were as follows for the three and nine months endedSeptember 30, 2018 and 2017 (in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2018			2017			2018			2017
Balance at beginning of period	$	8,241		$	12,686		$	12,069		$	16,050
Purchases	—			—			—			43
Accretion	(2,579		)	(4,315		)	(7,213		)	(9,334		)
Other (1)	236			3,453			1,042			5,065
Balance at end of period	$	5,898		$	11,824		$	5,898		$	11,824

⁽¹⁾  Primarily includes discount transfers from non-accretable discount to accretable discount due to better than expected performance of loan pools acquired and accounted for under ASC 310-30.

In our FDIC-assisted transactions, the fair value of purchased credit-impaired loans, on the acquisition date, was determined based on assigned risk ratings, expected cash flows and the fair value of loan collateral. The fair value of loans that were non-impaired was determined based on estimates of losses on defaults and other market factors. Due to the loss-share agreements with the FDIC, we recorded a receivable (FDIC indemnification asset) from the FDIC equal to the present value of the corresponding reimbursement percentages on the estimated losses embedded in the loan portfolio.

For other loans acquired through business combinations, the fair value of purchased credit-impaired loans, on the acquisition date, was determined based on assigned risk ratings, expected cash flows and the fair value of loan collateral. The fair value of loans that were non-impaired was determined based on estimates of losses on defaults and other market factors.

The carrying amount of loans acquired through a business combination by loan pool type are as follows (in thousands):

September 30, 2018	Purchased Credit-Impaired Loans		Purchased Non-Credit-Impaired Loans		Total
Covered loans (1):
Consumer related	$	12,979	$	—	$	12,979
Non-covered loans:
Commercial loans	7,173		122,630		129,803
Commercial loans collateralized by assignment of lease payments	—		14,114		14,114
Commercial real estate	22,173		536,351		558,524
Construction real estate	3,646		1,618		5,264
Consumer related	4,857		212,838		217,695
Total non-covered loans	37,849		887,551		925,400
Total acquired	$	50,828	$	887,551	$	938,379

⁽¹⁾  Covered loans refer to loans covered under loss-sharing agreements with the FDIC. The remaining loss-share agreements expire between 2019 and 2020.

In addition to loans acquired through a business combination noted in the table above, consumer related purchased credit-impaired loans include loans repurchased from GNMA of $40.2 million as of September 30, 2018.

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Note 6.   Goodwill and Intangibles

The excess of the cost of an acquisition over the fair value of the net assets acquired, including core deposit and client relationship intangibles, consists of goodwill. Under ASC Topic 350, goodwill is subject to at least annual assessments for impairment by applying a fair value based test. The Company reviews goodwill to determine potential impairment annually, or more frequently if events and circumstances indicate that goodwill might be impaired, by comparing the carrying value of the reporting units with the fair value of the reporting units.

The Company's annual assessment date is as of December 31. Goodwill is tested for impairment at the reporting unit level. The Company has three reporting units: Banking, Leasing, and Mortgage Banking. The carrying amount of goodwill was $1.0 billion at September 30, 2018 and December 31, 2017. On April 12, 2018, the Company announced the discontinuation of its national mortgage origination business, which includes substantially all originations outside of the Company's consumer banking footprint in the Chicagoland area. As a result, the Company recorded an impairment loss in the amount of $3.6 million within the Mortgage Banking segment in the second quarter of 2018. No impairment losses were recognized during the nine months endedSeptember 30, 2017.

The following table presents the carrying amount of goodwill by segment for the nine months endedSeptember 30, 2018 (in thousands):

	Banking		Leasing		Mortgage Banking			Total
Balance at beginning of period	$	959,285	$	40,640	$	3,623		$	1,003,548
Impairment	—		—		(3,623		)	(3,623		)
Balance at end of period	$	959,285	$	40,640	$	—		$	999,925

The Company has other intangible assets consisting of core deposit and client relationship intangibles that had a remaining weighted average amortization period of approximately 12 years as of September 30, 2018.

The following table presents the changes during the nine months endedSeptember 30, 2018 in the carrying amount of core deposit and client relationship intangibles, and the gross carrying amount, accumulated amortization, and net book value as of September 30, 2018 (in thousands):

	September 30, 2018
Balance at beginning of period	$	54,766
Amortization expense	(5,652		)
Balance at end of period	$	49,114
Gross carrying amount	$	112,820
Accumulated amortization	(63,706		)
Net book value	$	49,114

The following presents the estimated future amortization expense of other intangible assets (in thousands):

Year ending December 31,	Amount
2018	$	1,799
2019	5,674
2020	5,022
2021	4,790
2022	3,806
Thereafter	28,023
	$	49,114

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Note 7. Deposits

The composition of deposits was as follows as of September 30, 2018 and December 31, 2017 (in thousands):

	September 30,		December 31,
	2018		2017
Demand deposit accounts, non-interest bearing	$	6,036,012	$	6,381,512
NOW, money market, and interest bearing deposits	5,125,330		4,954,765
Savings accounts	1,180,997		1,167,810
Certificates of deposit, $250,000 or more	1,375,549		1,506,071
Other certificates of deposit	990,905		948,220
Total	$	14,708,793	$	14,958,378

Certificates of deposit of $250,000 or more included $972.3 million of brokered deposits at September 30, 2018 and $1.1 billion at December 31, 2017.  Brokered deposits typically consist of smaller individual time certificates that have the same liquidity characteristics and yields consistent with time certificates of $250,000 or more.

Note 8. Short-Term Borrowings

Short-term borrowings were as follows as of September 30, 2018 and December 31, 2017 (dollars in thousands):

	September 30, 2018				December 31, 2017
	Weighted Average Interest Rate		Amount		Weighted Average Interest Rate		Amount
Customer repurchase agreements	0.77	%	$	311,605	0.27	%	$	232,789
Federal Home Loan Bank advances	2.19		500,000		1.31		625,000
Federal funds purchased	2.35		91,750		1.26		3,250
Line of credit	—		—		—		—
Total	1.71	%	$	903,355	1.03	%	$	861,039

Securities sold under agreements to repurchase are agreements in which the Company acquires funds by selling assets to another party under a simultaneous agreement to repurchase the same assets at a specified price and date.  The Company enters into repurchase agreements and also offers a demand deposit account product to customers that sweeps their balances in excess of an agreed upon target amount into overnight repurchase agreements.  All securities sold under agreements to repurchase are recorded on the face of the balance sheet. The Company pledges mortgage-backed securities as collateral for the repurchase agreements and may be required to provide additional collateral based on the fair value of those securities.

The Company had Federal Home Loan Bank ("FHLB") advances with a maturity date less than one year of $500.0 million at September 30, 2018 and $625.0 million at December 31, 2017. At September 30, 2018, the interest rate on the advances outstanding on that date had rates ranging from 1.35% to 2.42% with maturities from October 2018 to September 2019. The Company has loans pledged as collateral on these Federal Home Loan Bank advances. See Note 5. Loans.

On December 18, 2015, the Company entered into a $35.0 million unsecured line of credit at the holding company level with a correspondent bank. Interest was payable at a rate of one month LIBOR + 1.75%. The line of credit matured on June 30, 2018.

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Note 9. Long-Term Borrowings

Long-term borrowings were as follows as of September 30, 2018 and December 31, 2017 (dollars in thousands):

	September 30, 2018				December 31, 2017
	Weighted Average Interest Rate		Amount		Weighted Average Interest Rate		Amount
Federal Home Loan Bank advances	2.65	%	$	198,939	1.73	%	$	231,317
Notes payable	4.77		79,675		4.14		90,807
Subordinated notes, net of issuance costs	4.00		173,063		4.00		173,034
Term note	—		—		3.31		10,000
Total	3.54	%	$	451,677	2.97	%	$	505,158

The Company had Federal Home Loan Bank advances with remaining contractual maturities greater than one year of $198.9 million at September 30, 2018 and $231.3 million at December 31, 2017. As of September 30, 2018, the advances had interest rates ranging from 2.45% to 5.87% and maturities ranging from December 2019 to April 2035. The Company has loans pledged as collateral on these Federal Home Loan Bank advances. See Note 5. Loans.

The Company had notes payable to banks totaling $76.5 million and $76.3 million at September 30, 2018 and December 31, 2017, respectively, which as of September 30, 2018, were accruing interest at rates ranging from 2.25% to 7.25%, with a weighted average rate of 4.73%.  Lease investments includes equipment with an amortized cost of $92.4 million and $91.9 million at September 30, 2018 and December 31, 2017, respectively, that is pledged as collateral on these notes. The Company also had $3.2 million and $14.5 million at September 30, 2018 and December 31, 2017, respectively, in other secured borrowings (included in the notes payable above) with a weighted average rate of 5.70% as of September 30, 2018.

On August 24, 2016, the Company assumed a $16.0 million unsecured term loan at the holding company level with a correspondent bank through the merger of American Chartered Bancorp, Inc. ("American Chartered") with and into the Company on that date. Interest was payable at a rate of one month LIBOR + 1.75%, and the loan was to mature on June 30, 2020. Principal payments of $1.0 million were due quarterly until maturity. This loan was prepaid in full in the first quarter of 2018.

On November 16, 2017, MB Financial Bank issued $175.0 million in 4.00% fixed-to-floating subordinated notes that mature on December 1, 2027. The subordinated notes bear a fixed interest rate of 4.00% until December 1, 2022 and a variable interest rate of three month LIBOR + 1.873% thereafter until maturity. The subordinated notes are callable on a semi-annual basis beginning on December 1, 2022.

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Note 10. Junior Subordinated Notes Issued to Capital Trusts

The Company has established statutory trusts for the sole purpose of issuing trust preferred securities and related trust common securities.  The proceeds from such issuances were used by the trusts to purchase junior subordinated notes of the Company, which are the sole assets of each trust.  Concurrently with the issuance of the trust preferred securities, the Company issued guarantees for the benefit of the holders of the trust preferred securities.  The Company’s outstanding trust preferred securities qualify, and are treated by the Company, as Tier 2 regulatory capital. Prior to the completion of the American Chartered merger, the trust preferred securities qualified, and were treated by the Company, as Tier 1 regulatory capital.  The Company owns all of the common securities of each trust.  The trust preferred securities issued by each trust rank equally with the common securities in right of payment, except that if an event of default under the indenture governing the notes has occurred and is continuing, the preferred securities will rank senior to the common securities in right of payment.

The table below summarizes the outstanding junior subordinated notes and the related trust preferred securities issued by each trust as of September 30, 2018 (in thousands).

	MB Financial Capital Trust II		MB Financial Capital Trust III		MB Financial Capital Trust IV
Junior Subordinated Notes:
Principal balance	$	36,083	$	10,310	$	20,619
Annual interest rate	3-mo LIBOR + 1.40%		3-mo LIBOR + 1.50%		3-mo LIBOR + 1.52%
Stated maturity date	September 15, 2035		September 23, 2036		September 15, 2036
Call date	December 15, 2010		September 23, 2011		September 15, 2011
Trust Preferred Securities:
Face Value	$	35,000	$	10,000	$	20,000
Annual distribution rate	3-mo LIBOR + 1.40%		3-mo LIBOR + 1.50%		3-mo LIBOR + 1.52%
Issuance date	August 2005		July 2006		August 2006
Distribution dates (1)	Quarterly		Quarterly		Quarterly

	MB Financial Capital Trust V		MB Financial Capital Trust VI		FOBB Statutory Trust III (2)(4)
Junior Subordinated Notes:
Principal balance	$	30,928	$	23,196	$	5,155
Annual interest rate	3-mo LIBOR + 1.30%		3-mo LIBOR + 1.30%		3-mo LIBOR + 2.80%
Stated maturity date	December 15, 2037		October 30, 2037		January 23, 2034
Call date	December 15, 2012		October 30, 2012		January 23, 2009
Trust Preferred Securities:
Face Value	$	30,000	$	22,500	$	5,000
Annual distribution rate	3-mo LIBOR + 1.30%		3-mo LIBOR + 1.30%		3-mo LIBOR + 2.80%
Issuance date	September 2007		October 2007		December 2003
Distribution dates (1)	Quarterly		Quarterly		Quarterly

	American Chartered Statutory Trust II (3)(4)
Junior Subordinated Notes:
Principal balance	$	10,310
Annual interest rate	3-mo LIBOR + 2.75%
Stated maturity date	October 7, 2034
Call date	October 7, 2009
Trust Preferred Securities:
Face Value	$	10,000
Annual distribution rate	3-mo LIBOR + 2.75%
Issuance date	August 2004
Distribution dates (1)	Quarterly

⁽¹⁾  All distributions are cumulative and paid in cash.

⁽²⁾  FOBB Statutory Trust III was established by First Oak Brook Bancshares, Inc. (“FOBB”) prior to the Company's acquisition of FOBB in 2006, and the junior subordinated notes issued by FOBB to FOBB Statutory Trust III were assumed by the Company upon completion of the acquisition.

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⁽³⁾  American Chartered Statutory Trust II was established by American Chartered prior to the Company's acquisition of American Chartered in August 2016, and the junior subordinated notes issued by American Chartered to American Chartered Statutory Trust II were assumed by the Company upon completion of the acquisition. Principal balance and face value amounts associated with American Chartered Statutory Trust II do not include acquisition accounting adjustments to such amounts, which in each case resulted in a remaining discount of $2.6 million at September 30, 2018.

⁽⁴⁾  Subsequent to September 30, 2018, the Company redeemed all of the outstanding junior subordinated notes held by American Chartered Statutory Trust II, which concurrently redeemed all of its outstanding trust preferred securities, and the Company redeemed all of the outstanding junior subordinated notes held by FOBB Statutory Trust III, which concurrently redeemed all of its outstanding trust preferred securities. See Note 18. Subsequent Events.

The trust preferred securities are subject to mandatory redemption, in whole or in part, upon repayment of the junior subordinated notes at the stated maturity date or upon redemption.  Each trust’s ability to pay amounts due on the trust preferred securities is solely dependent upon the Company making payment on the related junior subordinated notes.  The Company’s obligation under the junior subordinated notes and other relevant trust agreements, in aggregate, constitute a full and unconditional guarantee by the Company of each trust’s obligations under the trust preferred securities issued by each trust.  The Company has the right to defer payment of interest on the notes and, therefore, distributions on the trust preferred securities, for up to five years, but not beyond the stated maturity date in the table above.  During any such deferral period, the Company may not pay cash dividends on its common or preferred stock and generally may not repurchase its common or preferred stock.

On March 19, 2018, the Company redeemed the junior subordinated notes held by American Chartered Statutory Trust I and, as a result, all of the issued and outstanding three month LIBOR + 3.60% American Chartered Statutory Trust I capital (preferred) securities were concurrently redeemed. The aggregate liquidation amount of these trust preferred securities was $20.0 million. American Chartered Statutory Trust I was established by American Chartered prior to the Company's acquisition of American Chartered, and the junior subordinated notes issued by American Chartered to American Chartered Statutory Trust I were assumed by the Company upon completion of the acquisition. As a result, the Company recognized a $3.1 million loss on extinguishment of debt in the first quarter of 2018.

On August 6, 2018, the Company redeemed the junior subordinated notes held by Coal City Capital Trust I and, as a result, all of the issued and outstanding three month LIBOR + 1.80% Coal City Capital Trust I capital (preferred) securities were concurrently redeemed. The aggregate liquidation amount of these trust preferred securities was $25.0 million. Coal City Capital Trust I was established by Coal City Corporation prior to the Company's acquisition of Coal City Corporation, and the junior subordinated notes issued by Coal City Corporation to Coal City Capital Trust I were assumed by the Company upon completion of the acquisition. As a result, the Company recognized a $341 thousand loss on extinguishment of debt in the third quarter of 2018.

On September 17, 2018, the Company redeemed the junior subordinated notes held by TAYC Capital Trust II and, as a result, all of the issued and outstanding three month LIBOR + 2.68% TAYC Capital Trust II capital (preferred) securities were concurrently redeemed. The aggregate liquidation amount of these trust preferred securities was $40.0 million. TAYC Capital Trust II was established by Taylor Capital Group, Inc. ("Taylor Capital") prior to the Company's acquisition of Taylor Capital and the junior subordinated notes issued by Taylor Capital to TAYC Capital Trust II were assumed by the Company upon completion of the acquisition. As a result, the Company recognized a $5.9 million loss on extinguishment of debt in the third quarter of 2018.

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Note 11. Commitments and Contingencies

Commitments: The Company is a party to credit-related financial instruments with off-balance-sheet risk in the normal course of business to meet the financing needs of its customers.  These financial instruments include commitments to extend credit, standby letters of credit, and commercial letters of credit.  Such commitments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the consolidated balance sheets.

The Company’s exposure to credit loss is represented by the contractual amount of these commitments.  The Company follows the same credit policies in making commitments as it does for on-balance-sheet instruments.

At September 30, 2018 and December 31, 2017, the following financial instruments were outstanding, the contractual amounts of which represent off-balance sheet credit risk (in thousands):

	Contractual Amount
	September 30, 2018		December 31, 2017
Commitments to extend credit:
Home equity lines	$	191,427	$	203,922
Other commitments	4,033,841		4,073,044
Letters of credit:
Standby	173,565		161,014
Commercial	1,564		2,248

Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract.  Commitments generally have fixed expiration dates or other termination clauses and may require a payment of a fee.  The commitments for home equity lines of credit may expire without being drawn upon.  Therefore, the total commitment amounts do not necessarily represent future cash requirements.  The amount of collateral obtained, if it is deemed necessary by the Company, is based on management’s credit evaluation of the customer.

The Company, in the normal course of its business, regularly offers standby and commercial letters of credit to its bank customers.  Standby and commercial letters of credit are a conditional but irrevocable form of guarantee.  Under letters of credit, the Company typically guarantees payment to a third party beneficiary upon the default of payment or nonperformance by the bank customer and upon receipt of complying documentation from that beneficiary.

Both standby and commercial letters of credit may be issued for any length of time, but normally do not exceed a period of five years.  These letters of credit may also be extended or amended from time to time depending on the bank customer’s needs.  As of September 30, 2018, the maximum remaining term for any standby letters of credit was December 31, 2025.  A fee is charged to the bank customer and is recognized as income over the life of the letter of credit, unless considered non-rebatable under the terms of a letter of credit application.

At September 30, 2018, the aggregate contractual amount of these letters of credit, which represents the maximum potential amount of future payments that the Company would be obligated to pay, increased$11.9 million to $175.1 million from $163.3 million at December 31, 2017.  Of the $175.1 million in commitments outstanding at September 30, 2018, approximately $116.7 million of the letters of credit have been issued or renewed since December 31, 2017.

Letters of credit issued on behalf of bank customers may be done on either a secured or unsecured basis.  If a letter credit is secured, the collateral can take various forms including bank accounts, investments, fixed assets, inventory, accounts receivable or real estate.  The Company takes the same care in making credit decisions and obtaining collateral when it issues letters of credit on behalf of its customers as it does when making other types of loans.

As of September 30, 2018, the Company had approximately $1.9 million in capital expenditure commitments outstanding which relate to various projects to renovate the corporate office space and branches.

Concentrations of credit risk:  As of September 30, 2018, approximately 20% of our investments in securities issued by states and political subdivisions were within the state of Illinois.  We did not hold any direct exposure to the state of Illinois as of September 30, 2018. Our commitments to extend credit are primarily related to commercial credits.  Standby and commercial letters of credit are granted primarily to commercial borrowers. Our asset-based loans are made to borrowers located throughout the United States. Lease banking provides banking services to lessors located throughout the United States. Our leasing subsidiaries originate leases

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to companies located throughout the United States. In addition, our indirect vehicle lenders originate loans to borrowers located throughout the United States.

Contingencies: In the normal course of business, the Company is involved in various legal proceedings.  In the opinion of management, any liability resulting from pending proceedings would not be expected to have a material adverse effect on the Company’s consolidated financial statements.

Note 12. Fair Value Measurements

ASC Topic 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability. The price in the principal (or most advantageous) market used to measure the fair value of the asset or liability shall not be adjusted for transaction costs. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets and liabilities; it is not a forced transaction. Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact and (iv) willing to transact.

ASC Topic 820 requires the use of valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets and liabilities. The income approach uses valuation techniques to convert expected future amounts, such as cash flows or earnings, to a single present value amount on a discounted basis. The cost approach is based on the amount that currently would be required to replace the service capacity of an asset (replacement cost). Valuation techniques should be consistently applied. Inputs to valuation techniques refer to the assumptions that market participants would use in pricing the asset or liability. Inputs may be observable, meaning those that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources, or unobservable, meaning those that reflect the reporting entity's own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. In that regard, ASC Topic 820 establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows:

Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date.

Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

Level 3: Significant unobservable inputs that reflect a reporting entity's own assumptions about the assumptions that market participants would use in pricing an asset or liability.

A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below.

In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality, the Company's creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. Our valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes the Company's valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally coincides with the Company's monthly and/or quarterly valuation process.

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Financial Instruments Recorded at Fair Value on a Recurring Basis

Securities Available for Sale. The fair values of securities available for sale are determined by quoted prices in active markets, when available, and classified as Level 1. If quoted market prices are not available, the fair value is determined by matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities and classified as Level 2. In cases where significant credit valuation adjustments are incorporated into the estimation of fair value, reported amounts are classified as Level 3. The change in fair value is recorded through an adjustment to the statement of other comprehensive income.

Marketable Equity Securities. The fair values of marketable equity securities are determined by quoted prices in active markets, when available, and classified as Level 1. The change in fair value is recorded through an adjustment to the statement of operations.

Loans Held for Sale. Mortgage loans originated and held for sale in the secondary market are carried at fair value.The fair value of loans held for sale is determined using quoted secondary market prices and classified as Level 2. The change in fair value is recorded through an adjustment to the statement of operations.

Loans. The Company has elected to record certain mortgage loans at fair value. The fair value of these loans is determined using quoted secondary market prices and classified as Level 2. The change in fair value is recorded through an adjustment to the statement of operations.

Mortgage Servicing Rights. The Company has elected to record its mortgage servicing rights at fair value. Mortgage servicing rights do not trade in an active market with readily observable prices. Accordingly, the Company determines the fair value of mortgage servicing rights by estimating the fair value of the future cash flows associated with the mortgage loans being serviced. Key economic assumptions used in measuring the fair value of mortgage servicing rights include, but are not limited to, prepayment speeds, discount rates, delinquencies and cost to service. The assumptions used in the model are validated on a regular basis. The fair value is validated on a quarterly basis with an independent third party. Any material discrepancies between the internal model and the third party validation are investigated and resolved by an internal committee. Due to the nature of the valuation inputs, mortgage servicing rights are classified in Level 3 of the fair value hierarchy. The change in fair value is recorded through an adjustment to the statement of operations.

Assets Held in Trust for Deferred Compensation and Associated Liabilities.Assets held in trust for deferred compensation are recorded at fair value and included in “Other Assets” on the consolidated balance sheets. These assets are invested in mutual funds and classified as Level 1. Deferred compensation liabilities, also classified as Level 1, are carried at the fair value of the obligation to the employee, which corresponds to the fair value of the invested assets. The change in fair value is recorded through an adjustment to the statement of operations.

Derivatives. Currently, we use interest rate swaps to manage our interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative and classified as Level 2. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including LIBOR rate curves. The Company also obtains dealer quotations for these derivatives for comparative purposes to assess the reasonableness of the model valuations. In addition, the Company uses forward commitments to buy to-be-announced mortgage securities for which we do not intend to take delivery of the security and will enter into an offsetting position before physical delivery to lessen the price volatility of the mortgage servicing rights asset. Dealer quotations are used for these derivatives and are classified as Level 1. The Company also offers other derivatives, including foreign currency forward contracts and interest rate lock commitments, to our customers and offset our exposure from such contracts by purchasing other financial contracts, which are valued using market consensus prices. For certain interest rate lock commitments, the Company uses an external valuation model that relies on internally developed inputs to estimate the fair value of its interest rate lock commitments. This is based on unobservable inputs that reflect management’s assumptions and specific information about each borrower transaction and is classified in Level 3 of the hierarchy. The change in fair value is recorded through an adjustment to the statement of operations.

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The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of September 30, 2018 and December 31, 2017, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands):

	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2018
Financial assets
Securities available for sale:
U.S Government sponsored agencies and enterprises	$	5,002	$	—	$	5,002	$	—
States and political subdivisions	343,256		—		342,927		329
Residential mortgage-backed securities	1,316,274		—		1,316,261		13
Commercial mortgage-backed securities	41,040		—		41,040		—
Corporate bonds	5,064		—		5,064		—
Marketable equity securities	10,901		10,901		—		—
Loans held for sale	51,834		—		51,834		—
Loans	42,363		—		42,363		—
Mortgage servicing rights	295,803		—		—		295,803
Assets held in trust for deferred compensation	25,605		25,605		—		—
Derivative financial instruments	58,196		198		57,998		—
Financial liabilities
Other liabilities (1)	25,605		25,605		—		—
Derivative financial instruments	59,309		351		58,726		232
December 31, 2017
Financial assets
Securities available for sale:
U.S. Government sponsored agencies and enterprises	$	23,007	$	—	$	23,007	$	—
States and political subdivisions	379,325		—		378,996		329
Residential mortgage-backed securities	852,699		—		852,665		34
Commercial mortgage-backed securities	72,035		—		72,035		—
Corporate bonds	70,197		—		70,197		—
Equity securities	11,063		11,063		—		—
Loans held for sale	548,578		—		548,578		—
Loans	40,531		—		40,531		—
Mortgage servicing rights	276,279		—		—		276,279
Assets held in trust for deferred compensation	21,410		21,410		—		—
Derivative financial instruments	31,499		389		29,539		1,571
Financial liabilities
Other liabilities (1)	21,410		21,410		—		—
Derivative financial instruments	40,296		1,072		39,224		—

⁽¹⁾  Liabilities associated with assets held in trust for deferred compensation

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The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a recurring basis that were categorized within the Level 3 of the fair value hierarchy (fair value in thousands):

	Fair Value at
	September 30, 2018		Valuation Technique	Unobservable Input	Range
States and political subdivisions	$	329	Discounted cash flows	Credit assumption	40% - 45% Loss
Residential mortgage-backed securities	13		Discounted cash flows	Constant pre-payment rates (CPR)	1% - 3%
Mortgage servicing rights	295,803		Discounted cash flows	CPR	6.20% - 6.60%
				Discount rate	9.53 - 11.08
				Maturity (months)	327 - 358
				Delinquency rate	2.32 - 4.84
				Costs to service	$ 67 - $ 227
				Additive delinquent costs to service	$ 175 - $ 1,000
Derivative financial instruments (mortgage	—		Sales cash flows	Expected closing ratio	70% - 95%
interest rate lock commitments)				Expected delivery price	99.45 bps - 104.56 bps

	Fair Value at
	December 31, 2017		Valuation Technique	Unobservable Input	Range
States and political subdivisions	$	329	Discounted cash flows	Credit assumption	40-45% Loss
Residential mortgage-backed securities	34		Discounted cash flows	Constant pre-payment rates (CPR)	1% - 3%
Mortgage servicing rights	276,279		Discounted cash flows	CPR	6.7% - 7.8%
				Discount rate	9.53 - 11.06
				Maturity (months)	324 - 358
				Delinquency rate	2.42 - 5.30
				Costs to service	$ 67 - $ 227
				Additive delinquent costs to service	$ 175 - $ 1,000
Derivative financial instruments (mortgage	1,571		Sales cash flows	Expected closing ratio	70% - 95%
interest rate lock commitments)				Expected delivery price	97.38 bps - 106.87 bps

The significant unobservable inputs used in the fair value measurement of the Company’s mortgage servicing rights include prepayment speeds, discount rates, maturities, delinquencies and cost to service. Significant increases in prepayment speeds, discount rates, delinquencies or cost to service would result in a significantly lower fair value measurement. Conversely, significant decreases in prepayment speeds, discount rates, delinquencies or costs to service would result in a significantly higher fair value measurement. With the exception of changes in delinquencies, which can change the cost to service, the unobservable inputs move independently of each other.

Key economic assumptions used in the measuring of the fair value of the mortgage servicing rights and the sensitivity of the fair value to immediate adverse changes in those assumptions at September 30, 2018 are presented in the following table. This table does not take into account the derivatives used to economically hedge the mortgage servicing rights.

(dollars in thousands, except for weighted average cost to service)	September 30, 2018
Weighted average CPR	6.40		%
Impact on fair value of 10% adverse change	$	(8,430	)
Impact on fair value of 20% adverse change	(16,451		)
Weighted average discount rate	9.84		%
Impact on fair value of 10% adverse change	$	(12,623	)
Impact on fair value of 20% adverse change	(24,232		)
Weighted average delinquency rate	4.58		%
Impact on fair value of 10% adverse change	$	(3,098	)
Impact on fair value of 20% adverse change	(5,299		)
Weighted average costs to service	$	91.00
Impact on fair value of 10% adverse change	(5,475		)
Impact on fair value of 20% adverse change	(10,949		)

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The Company did not have any transfers between Level 1 and Level 2 of the fair value hierarchy during the nine months endedSeptember 30, 2018. The Company's policy for determining transfers between levels occurs at the end of the reporting period when circumstances in the underlying valuation criteria change and result in transfer between levels.

The following table presents additional information about financial assets measured at fair value on a recurring basis for which the Company used significant unobservable inputs (Level 3):

	Nine Months Ended
	September 30,
	2018			2017			2018			2017			2018			2017
(in thousands)	Investment Securities						Mortgage Servicing Rights						Derivatives
Balance, beginning of period	$	363		$	544		$	276,279		$	238,011		$	1,571		$	3,160
Purchases	—			—			161			839			—			—
Originations	—			—			30,086			43,197			—			—
Included in earnings	—			—			(10,723		)	(20,601		)	(1,571		)	(1,221		)
Principal payments	(21		)	(106		)	—			—			—			—
Sales	—			—			—			—			—			—
Balance, ending of period	$	342		$	438		$	295,803		$	261,446		$	—		$	1,939

The Company had $232 thousand in financial liabilities measured at fair value on a recurring basis for which the Company used significant unobservable inputs (Level 3) at September 30, 2018. This financial liability relates to derivative financial instruments (mortgage interest rate lock commitments) that were added during the nine months ended September 30, 2018.

Financial Instruments Recorded at Fair Value on a Nonrecurring Basis

The Company may be required, from time to time, to measure certain financial assets and financial liabilities at fair value on a nonrecurring basis in accordance with U.S. GAAP. These include assets that are measured at the lower of cost or fair value that were recognized at fair value below cost at the end of the period.

Impaired Loans.Loans for which it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement are considered impaired. Once a loan is identified as individually impaired, management measures impairment in accordance with ASC Topic 310. The fair value of impaired loans is estimated using one of several methods, including collateral value, market value of similar debt, enterprise value, liquidation value, and discounted cash flows. Those impaired loans not requiring an allowance represent loans for which the fair value of the expected repayments or collateral exceed the recorded investments in such loans. In accordance with ASC Topic 820, impaired loans where an allowance is established based on the fair value of collateral require classification in the fair value hierarchy. Collateral values are estimated using Level 3 inputs based on customized discounting criteria. For a majority of impaired real estate loans where an allowance is established based on the fair value of collateral (100% at September 30, 2018), the Company obtains a current external appraisal. Other valuation techniques are used as well, including internal valuations, comparable property analysis and contractual sales information.

Non-Financial Assets and Non-Financial Liabilities Recorded at Fair Value

The Company has no non-financial assets or non-financial liabilities measured at fair value on a recurring basis. Certain non-financial assets and non-financial liabilities measured at fair value on a non-recurring basis include foreclosed assets and non-financial long-lived assets.

Other Real Estate and Repossessed Vehicles Owned (Foreclosed Assets). Foreclosed assets, upon initial recognition, are measured and reported at fair value through a charge-off to the allowance for loan and lease losses based upon the fair value of the foreclosed asset. The fair value of foreclosed assets, upon initial recognition, are estimated using Level 3 inputs based on customized discounting criteria.

Non-Financial Long-Lived Assets.  Non-financial long-lived assets, when determined to be impaired, are measured and reported at fair value using Level 3 inputs based on customized discounting criteria.

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Assets measured at fair value on a nonrecurring basis as of September 30, 2018 and December 31, 2017 are included in the table below (in thousands):

	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2018
Financial assets:
Impaired loans	$	69,721	$	—	$	—	$	69,721
Non-financial assets:
Foreclosed assets	14,464		—		—		14,464
December 31, 2017
Financial assets:
Impaired loans	$	60,569	$	—	$	—	$	60,569
Non-financial assets:
Foreclosed assets	15,113		—		—		15,113

The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a nonrecurring basis that were categorized within the Level 3 of the fair value hierarchy (fair value in thousands):

	Fair Value at		Valuation
	September 30, 2018		Technique	Unobservable Input	Range
Impaired loans	$	69,721	Appraisal of collateral	Appraisal adjustments - sales costs	5% - 10%
Foreclosed assets	14,464		Appraisal of collateral	Appraisal adjustments - sales costs	5% - 10%

	Fair Value at		Valuation
	December 31, 2017		Technique	Unobservable Input	Range
Impaired loans	$	60,569	Appraisal of collateral	Appraisal adjustments - sales costs	5% - 10%
Foreclosed assets	15,113		Appraisal of collateral	Appraisal adjustments - sales costs	5% - 10%

ASC Topic 825 requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis. The methodologies for estimating the fair value of financial assets and financial liabilities that are measured at fair value on a recurring or non-recurring basis are discussed above. The estimated fair value approximates carrying value for cash and cash equivalents, accrued interest and the cash surrender value of life insurance policies. The methodologies for other financial assets and financial liabilities are discussed below:

The following methods and assumptions were used by the Company in estimating the fair values of its other financial instruments:

Cash and due from banks and interest earning deposits with banks: The carrying amounts reported in the balance sheet approximate fair value.

Securities held to maturity: The fair values of securities held to maturity are determined by quoted prices in active markets, when available, and classified as Level 1. If quoted market prices are not available, the fair value is determined by matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities and classified as Level 2. In cases where significant credit valuation adjustments are incorporated into the estimation of fair value, reported amounts are classified as Level 3.

Non-marketable securities - FHLB and FRB Stock: The carrying amounts reported in the balance sheet approximate fair value.

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Loans: The fair values for loans are estimated using discounted cash flow analyses, using the corporate bond curve adjusted for liquidity for commercial loans and the swap curve adjusted for liquidity for retail loans, including increased interest rate spreads to incorporate a credit mark, estimating an exit price.

Non-interest bearing deposits: The fair values disclosed are equal to their balance sheet carrying amounts, which represent the amount payable on demand.

Interest bearing deposits: The fair values disclosed for deposits with no defined maturities are equal to their carrying amounts, which represent the amounts payable on demand. Fair values for certificates of deposit are estimated using a discounted cash flow calculation that applies the Company's current incremental borrowing rates for similar terms.

Short-term borrowings: The carrying amounts of federal funds purchased, borrowings under repurchase agreements and other short-term borrowings with maturities of 90 days or less approximate their fair values.  The fair value of short-term borrowings greater than 90 days is based on the discounted value of contractual cash flows.

Long-term borrowings: The fair values of the Company's long-term borrowings (other than deposits) are estimated using discounted cash flow analyses, based on the Company's current incremental borrowing rates for similar types of borrowing arrangements.

Junior subordinated notes issued to capital trusts: The fair values of the Company's junior subordinated notes issued to capital trusts are estimated based on the quoted market prices, when available, of the related trust preferred security instruments, or are estimated based on the quoted market prices of comparable trust preferred securities.

Accrued interest: The carrying amount of accrued interest receivable and payable approximate their fair values.

Off-balance-sheet instruments: Fair values for the Company’s off-balance-sheet lending commitments (guarantees, letters of credit and commitments to extend credit) are based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements.

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The estimated fair values of financial instruments are as follows (in thousands):

	September 30, 2018
	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial Assets:
Cash and due from banks	$	342,933	$	342,933	$	342,933	$	—	$	—
Interest earning deposits with banks	87,740		87,740		87,740		—		—
Investment securities available for sale	1,710,636		1,710,636		—		1,710,294		342
Investment securities held to maturity	923,082		932,756		—		932,756		—
Marketable equity securities	10,901		10,901		10,901		—		—
Non-marketable securities - FHLB and FRB stock	107,407		107,407		—		—		107,407
Loans held for sale	51,834		51,834		—		51,834		—
Loans, net	13,779,541		13,836,445		—		42,362		13,794,083
Accrued interest receivable	66,122		66,122		66,122		—		—
Derivative financial instruments	58,196		58,196		198		57,998		—
Financial Liabilities:
Non-interest bearing deposits	$	6,036,012	$	6,036,012	$	6,036,012	$	—	$	—
Interest bearing deposits	8,672,781		8,659,683		—		—		8,659,683
Short-term borrowings	903,355		903,232		—		—		903,232
Long-term borrowings	451,677		451,620		—		—		451,620
Junior subordinated notes issued to capital trusts	133,995		108,394		—		—		108,394
Accrued interest payable	8,962		8,962		8,962		—		—
Derivative financial instruments	59,309		59,309		351		58,726		232

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	December 31, 2017
	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial Assets:
Cash and due from banks	$	397,880	$	397,880	$	397,880	$	—	$	—
Interest earning deposits with banks	181,341		181,341		181,341		—		—
Investment securities available for sale	1,408,326		1,408,326		11,063		1,396,900		363
Investment securities held to maturity	959,082		992,455		—		992,455		—
Non-marketable securities - FHLB and FRB stock	114,111		114,111		—		—		114,111
Loans held for sale	548,578		548,578		—		548,578		—
Loans, net	13,808,352		13,988,392		—		40,531		13,947,861
Accrued interest receivable	63,589		63,589		63,589		—		—
Derivative financial instruments	31,499		31,499		389		29,539		1,571
Financial Liabilities:
Non-interest bearing deposits	$	6,381,512	$	6,381,512	$	6,381,512	$	—	$	—
Interest bearing deposits	8,576,866		8,569,368		—		—		8,569,368
Short-term borrowings	861,039		860,676		—		—		860,676
Long-term borrowings	505,158		513,725		—		—		513,725
Junior subordinated notes issued to capital trusts	211,494		170,965		—		—		170,965
Accrued interest payable	6,458		6,458		6,458		—		—
Derivative financial instruments	40,296		40,296		1,072		39,224		—

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Note 13. Stock Incentive Plans

ASC Topic 718 requires that the grant date fair value of equity awards to employees be recognized as compensation expense over the period during which an employee is required to provide service in exchange for such award.

The following table summarizes the impact of the Company’s share-based payment plans in the financial statements for the periods shown (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Total compensation expense for share-based payment plans during the period	$	4,542	$	4,393	$	13,688	$	13,317
Amount of related income tax benefit recognized in income (1)	1,507		2,175		5,460		8,513

⁽¹⁾ Includes tax benefits recorded for the vesting of restricted shares and exercise of options.

The Company adopted the Omnibus Incentive Plan (the “Omnibus Plan”) in 1997.  On May 28, 2014, the Company’s stockholders approved the third amendment and restatement of the Omnibus Plan to add 3,100,000 authorized shares for a total of 11,400,000 shares of common stock authorized to be utilized in connection with awards under the Omnibus Plan to directors, officers, and employees of the Company or any of its subsidiaries. The number of shares authorized increased by 2,400,000 to 13,800,000 upon completion of the Taylor Capital merger.  Equity grants under the Omnibus Plan can be in the form of incentive stock options, non-qualified stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance units, and other stock-based awards.  Shares awarded in the form of restricted stock, restricted stock units, performance shares, performance units, or other stock-based awards generally will reduce the shares available under the Omnibus Plan on a 2-for-1 basis. No more than 10% of the total number of authorized shares may be issued with respect to awards granted after May 28, 2014, other than stock appreciation rights, stock options and performance-based awards, which at the date of grant are scheduled to fully vest prior to three years from the date of grant (although such awards may provide scheduled vesting earlier with respect to some of such shares and for acceleration of vesting as provided in the Omnibus Plan).  As of September 30, 2018, there were 2,131,433 shares available for future grants.

Annual equity-based incentive awards are generally granted to selected officers and employees in the first quarter of the year.  Options are granted with an exercise price equal to no less than the market price of the Company’s shares at the date of grant; those option awards generally vest over four years of service and have 10-year contractual terms.  Restricted shares and units typically vest over a two to four year period.  Equity awards may also be granted at other times throughout the year in connection with the recruitment and retention of officers and employees.  Directors currently may elect, in lieu of cash, to receive up to 70% of their fees in stock options with a five year term, which are fully vested on the grant date (provided that the director may not sell the underlying shares for at least six months after the grant date), and up to 100% of their fees in restricted shares, which vest one year after the grant date.

The following table summarizes changes in stock options for the nine months endedSeptember 30, 2018:

	Number of Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (In Years)	Aggregate Intrinsic Value (in thousands)
Options outstanding as of December 31, 2017	1,721,978		$	29.10	5.19
Granted	167,457		41.34
Exercised	(445,268	)	26.36
Expired	(2,293	)	33.08
Forfeited or cancelled	(24,031	)	30.56
Options outstanding as of September 30, 2018	1,417,843		$	31.37	5.92	$	20,908
Options exercisable as of September 30, 2018	928,013		$	28.46	4.78	$	16,393

The fair value of each option award is estimated on the date of grant using the Black-Scholes option pricing model based on certain assumptions.  Expected volatility is based on historical volatility and the expectations of future volatility of Company shares.  The risk free interest rate for periods within the contractual term of the option is based on the U.S. Treasury yield curve in effect at the

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time of the grant.  The expected life of options is estimated based on historical employee behavior and represents the period of time that options granted are expected to remain outstanding.

 The following assumptions were used for options granted during the nine months endedSeptember 30, 2018:

	September 30, 2018
Risk-free interest rate	2.80		%
Expected volatility of Company’s stock	25.90		%
Expected dividend yield	2.06		%
Expected life of options	5.7 years
Weighted average fair value per option of options granted during the year	$	9.45

The total intrinsic value of options exercised during the nine months endedSeptember 30, 2018 and 2017 was $9.7 million and $5.2 million, respectively.

The following is a summary of changes in restricted shares and units for the nine months endedSeptember 30, 2018:

	Number of Shares and Units		Weighted Average Grant Date Fair Value
Shares and units outstanding at December 31, 2017	973,201		$	37.03
Granted	427,939		41.66
Vested	(316,639	)	34.73
Forfeited or cancelled	(108,293	)	35.74
Shares and units outstanding at September 30, 2018	976,208		39.95

The total intrinsic value of restricted shares and units that vested during the nine months endedSeptember 30, 2018 and 2017 was $13.4 million and $17.4 million, respectively.

The Company awarded 71,567, 65,476, and 80,780 market-based restricted stock units in 2018, 2017, and 2016, respectively, which entitle recipients to shares of common stock at the end of a three year vesting period. Recipients will earn shares, totaling between 0% and 175% of the number of units issued, based on the Company's total stockholder return relative to a specified peer group of financial institutions over the three year period. The Company awarded 71,560 market-based restricted stock units in 2015 that vested in 2018. The threshold performance for the units granted in 2015 was not met and, as a result, no shares were issued. The market-based restricted stock units are included in the preceding table as if the recipients earned shares equal to 100% of the units issued. A Monte Carlo simulation model was used to value the market-based restricted stock units at the time awarded.

As of September 30, 2018, there was $26.1 million of total unrecognized compensation cost related to nonvested share-based compensation arrangements (including share option and nonvested share awards) granted under the Omnibus Plan.  At September 30, 2018, the weighted-average period over which the unrecognized compensation expense is expected to be recognized was approximately two years.

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Note 14. Derivative Financial Instruments

The Company offers various derivatives, including interest rate swaps and foreign currency forward contracts, to its qualifying customers which can mitigate our exposure to market risk through the execution of off-setting positions with inter-bank dealer counterparties. This also permits the Company to offer customized risk management solutions to our customers. These customer accommodations and any offsetting financial contracts are treated as non-designated derivative instruments and carried at fair value through an adjustment to the statement of operations.

Interest rate swap and foreign currency forward contracts involve the risk of dealing with counterparties and their ability to meet contractual terms. The net amount payable or receivable under interest rate swaps is accrued as an adjustment to interest income.  The net amount payable as of September 30, 2018 and December 31, 2017 was approximately $1 thousand.  The Company's credit exposure on interest rate swaps is limited to the Company's net favorable value and interest payments of all swaps to each counterparty. In such cases, collateral is generally required from the counterparties involved if the net value of the swaps exceeds a nominal amount.  At September 30, 2018, the Company’s credit exposure relating to interest rate swaps was approximately $17.7 million, which is secured by the underlying collateral on customer loans. 

The Company also enters into mortgage banking derivatives which are classified as non-designated hedging derivatives. These derivatives include interest rate lock commitments provided to customers to fund certain mortgage loans to be sold into the secondary market and forward commitments for the future delivery of such loans. It is the Company's practice to enter into forward commitments for the future delivery of residential mortgage loans when interest rate lock commitments are entered into in order to economically hedge the effect of future changes in interest rates on its commitments to fund the loans as well as on its portfolio of mortgage loans held-for-sale.

The Company had fair value commercial loan interest rate swaps, to hedge its interest rate risk, with an aggregate notional amount of $18 thousand at September 30, 2018.  For fair value hedges, the changes in fair values of both the hedging derivative and the hedged item were recorded in current earnings as other income.

Interest rate swaps, swaptions and treasury futures are used in order to lessen the price volatility of the mortgage servicing rights asset. The Company also uses forward commitments to buy to-be-announced ("TBA") mortgage securities for which the Company does not intend to take delivery of the security and will enter into an offsetting position before physical delivery to lessen the price volatility of the mortgage servicing rights asset. These derivatives are recorded at their fair value on the consolidated balance sheets in other assets with changes in fair value recorded on the consolidated statements of operations in mortgage banking revenue in non-interest income.

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The Company’s derivative financial instruments are summarized below as of September 30, 2018 and December 31, 2017 (in thousands):

	Asset Derivatives								Liability Derivatives
	September 30, 2018				December 31, 2017				September 30, 2018					December 31, 2017
	Notional		Estimated		Notional		Estimated		Notional		Estimated			Notional		Estimated
	Amount		Fair Value		Amount		Fair Value		Amount		Fair Value			Amount		Fair Value
Derivative instruments designated as hedges of fair value:
Interest rate swap contracts (1)	$	—	$	—	$	—	$	—	$	18	$	(1	)	$	58	$	(1	)
Stand-alone derivative instruments: (2)
Interest rate swap contracts	1,713,998		38,624		1,563,109		21,217		1,713,998		(38,624		)	1,563,109		(21,217		)
Interest rate options contracts	506,760		4,324		372,927		1,887		506,760		(4,324		)	372,927		(1,887		)
Foreign exchange contracts	52,175		2,354		40,713		1,934		70,111		(2,298		)	34,029		(1,759		)
Spot foreign exchange contracts	13,036		35		1,424		23		3,119		(8		)	24		—
Mortgage related derivatives:
Interest rate swap contracts	225,000		12,661		458,000		4,479		275,000		(13,472		)	1,008,000		(14,360		)
Interest rate swaptions contracts	—		—		—		—		—		—			—		—
Treasury futures contracts	25,000		20		28,000		39		22,500		(88		)	30,000		(222		)
TBA mortgage securities	—		—		15,000		16		50,000		(250		)	100,000		(63		)
Forward loan sale commitments	35,800		178		259,000		333		9,500		(12		)	483,500		(787		)
Interest rate lock commitments	—		—		404,557		1,571		33,351		(232		)	—		—
Total stand-alone derivative instruments	2,571,769		58,196		3,142,730		31,499		2,684,339		(59,308		)	3,591,589		(40,295		)
Total	$	2,571,769	$	58,196	$	3,142,730	$	31,499	$	2,684,357	$	(59,309	)	$	3,591,647	$	(40,296	)

⁽¹⁾ Derivative instruments designated to hedge fixed-rate commercial real estate loans.

⁽²⁾ These portfolio swaps are not designated as hedging instruments under ASC Topic 815.

Amounts included in other operating income in the consolidated statements of operations related to derivative financial instruments were as follows (in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2018			2017			2018			2017
Derivative instruments designated as hedges of fair value:
Interest rate swap contracts	$	—		$	—		$	1		$	2
Stand-alone derivative instruments:
Interest rate swap contracts	617			3,276			4,245			6,749
Interest rate options contracts	—			—			—			—
Foreign exchange contracts	(83		)	(70		)	172			190
Spot foreign exchange contracts	723			629			2,340			2,036
Mortgage related derivatives	(1,630		)	(11,625		)	(3,083		)	(22,067		)
Total stand-alone derivative instruments	(373		)	(7,790		)	3,674			(13,092		)
Total	$	(373	)	$	(7,790	)	$	3,675		$	(13,090	)

Methods and assumptions used by the Company in estimating the fair value of its interest rate swaps are discussed in Note 12 to consolidated financial statements.

Certain instruments and transactions subject to an agreement similar to a master netting arrangement are eligible for offset in the consolidated balance sheet. The instruments and transactions would include derivatives, sale and repurchase agreements and reverse sale and repurchase agreements, and securities borrowing and securities lending arrangements. The Company’s derivative transactions with financial institution counterparties are generally executed under International Swaps and Derivative Association (“ISDA”) master agreements which include “right of set-off” provisions. Under these agreements, there is generally a legally

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enforceable right to offset recognized amounts, and there may be an intention to settle such amounts on a net basis. The Company, however, does not generally offset such financial instruments for financial reporting purposes.

Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of September 30, 2018 is summarized below (in thousands):

	Financial Assets						Financial Liabilities
	Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized		Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized
Derivatives:
Interest rate swap contracts, caps and floors	$	39,790	$	—	$	39,790	$	3,046	$	—	$	3,046
Foreign exchange contracts	700		—		700		1,802		—		1,802
Mortgage related derivatives	12,859		—		12,859		13,823		—		13,823
Total derivatives	53,349		—		53,349		18,671		—		18,671
Repurchase agreements	—		—		—		311,605		—		311,605
Total	$	53,349	$	—	$	53,349	$	330,276	$	—	$	330,276

	Financial Assets										Financial Liabilities
	Net Amount Recognized		Financial Instruments			Collateral			Net Amount		Net Amount Recognized		Financial Instruments			Collateral			Net Amount
Derivatives:
Counterparty A	$	10,830	$	(2,550	)	$	(8,253	)	$	27	$	2,550	$	(2,550	)	$	—		$	—
Counterparty B	4,084		(430		)	(3,471		)	183		430		(430		)	—			—
Counterparty C	2,280		—			(1,950		)	330		—		—			—			—
Other counterparties	36,155		(15,560		)	(1,752		)	18,843		15,691		(15,560		)	(1,875		)	(1,744		)
Total derivatives	53,349		(18,540		)	(15,426		)	19,383		18,671		(18,540		)	(1,875		)	(1,744		)
Repurchase agreements	—		—			—			—		311,605		—			(311,605		)	—
Total	$	53,349	$	(18,540	)	$	(15,426	)	$	19,383	$	330,276	$	(18,540	)	$	(313,480	)	$	(1,744	)

Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of December 31, 2017 is summarized below (in thousands):

	Financial Assets						Financial Liabilities
	Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized		Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized
Derivatives:
Interest rate swap contracts, caps and floors	$	11,659	$	—	$	11,659	$	11,562	$	—	$	11,562
Foreign exchange contracts	1,013		—		1,013		953		—		953
Mortgage related derivatives	4,868		—		4,868		15,432		—		15,432
Total derivatives	17,540		—		17,540		27,947		—		27,947
Repurchase agreements	—		—		—		232,789		—		232,789
Total	$	17,540	$	—	$	17,540	$	260,736	$	—	$	260,736

	Financial Assets									Financial Liabilities
	Net Amount Recognized		Financial Instruments			Collateral		Net Amount		Net Amount Recognized		Financial Instruments			Collateral			Net Amount
Derivatives:
Counterparty A	$	6,068	$	(6,068	)	$	—	$	—	$	13,807	$	(6,068	)	$	(7,739	)	$	—
Counterparty B	3,261		(3,261		)	—		—		5,595		(3,261		)	(2,334		)	—
Counterparty C	5,285		(3,640		)	—		1,645		3,640		(3,640		)	—			—
Other counterparties	2,926		(1,750		)	—		1,176		4,905		(1,750		)	(3,150		)	5
Total derivatives	17,540		(14,719		)	—		2,821		27,947		(14,719		)	(13,223		)	5
Repurchase agreements	—		—			—		—		232,789		—			(232,789		)	—
Total	$	17,540	$	(14,719	)	$	—	$	2,821	$	260,736	$	(14,719	)	$	(246,012	)	$	5

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Note 15.   Operating Segments

The Company's operations currently consist of three reportable operating segments: Banking, Leasing, and Mortgage Banking. The Company offers different products and services through its three segments. The accounting policies of the segments are generally the same as those of the consolidated company.

The Banking Segment generates its revenues primarily from its lending, deposit gathering and fee business activities. The profitability of this segment's operations depends primarily on its net interest income after provision for credit losses, which is the difference between interest earned on interest earning assets and interest paid on interest bearing liabilities less provision for credit losses.  The provision for credit losses is almost entirely dependent on changes in the Banking Segment's loan portfolio and management’s assessment of the collectability of the loan portfolio as well as prevailing economic and market conditions.  The Banking Segment is also subject to an extensive system of laws and regulations that are intended primarily for the protection of depositors and other customers, federal deposit insurance funds and the banking system as a whole.  These laws and regulations govern such areas as capital, permissible activities, allowance for loan and lease losses, loans and investments, and rates of interest that can be charged on loans. 

The Leasing Segment generates its revenues through lease originations and related services. The Leasing Segment invests directly in equipment that the Company leases (referred to as direct finance, leveraged or operating leases) to "Fortune 1000," middle-market companies and health care providers located throughout the United States. The lease portfolio is made up of various kinds of equipment, generally technology related, such as computer systems, satellite equipment, medical equipment and general manufacturing, industrial, construction and transportation equipment. The Leasing Segment also specializes in selling third party equipment maintenance contracts to large companies.

The Mortgage Banking Segment originates residential mortgage loans for sale to investors and for the Company's portfolio through its retail and third party originator channels. This segment also services residential mortgage loans for various investors and for loans owned by the Company. The Mortgage Banking Segment is subject to an extensive system of laws and regulations that are intended primarily for the protection of customers. On April 12, 2018, the Company announced the discontinuation of its national mortgage origination business, which includes substantially all originations outside of the Company's consumer banking footprint in the Chicagoland area. The Company is retaining the mortgage servicing asset, residential mortgage loans, and Chicagoland area originations. The Company expects to stop operating its mortgage business as a defined segment with separate Mortgage Banking Segment reporting in 2019.

Net interest income for the Leasing and Mortgage Banking segments include adjustments based on the Company's internal funds transfer pricing model. Non-interest income for the Leasing Segment includes income on loans originated for the sole purpose of funding equipment purchases related to leases at the Company's lease subsidiaries.

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The following tables present summary financial information for the reportable segments (in thousands):

	Banking		Leasing		Mortgage Banking			Consolidated
Three months ended September 30, 2018
Net interest income	$	152,003	$	2,160	$	7,685		$	161,848
Provision for credit losses	21,439		90		(26		)	21,503
Non-interest income	46,750		23,157		9,934			79,841
Non-interest expense (1)	126,979		15,611		25,954			168,544
Income tax expense	8,671		2,480		(2,223		)	8,928
Net income	$	41,664	$	7,136	$	(6,086	)	$	42,714
Total assets	$	16,677,552	$	1,340,901	$	1,701,518		$	19,719,971
Three months ended September 30, 2017
Net interest income	$	142,888	$	2,686	$	11,373		$	156,947
Provision for credit losses	3,637		399		481			4,517
Non-interest income	45,128		22,560		28,243			95,931
Non-interest expense (1)	113,014		14,498		35,449			162,961
Income tax expense	18,781		4,307		1,469			24,557
Net income	$	52,584	$	6,042	$	2,217		$	60,843
Total assets	$	16,406,714	$	1,307,459	$	2,402,362		$	20,116,535

⁽¹⁾  Includes merger related and repositioning expenses of $4.2 million and $9.8 million in the Banking and Mortgage Banking Segment, respectively, for the three months ended September 30, 2018 and $1.6 million in the Banking Segment for the three months ended September 30, 2017.

	Banking		Leasing		Mortgage Banking			Consolidated
Nine months ended September 30, 2018
Net interest income	$	439,088	$	6,991	$	28,219		$	474,298
Provision for credit losses	34,764		566		(100		)	35,230
Non-interest income	136,558		70,664		53,727			260,949
Non-interest expense (1)	367,489		46,319		115,614			529,422
Income tax expense	37,288		4,288		(8,985		)	32,591
Net income	$	136,105	$	26,482	$	(24,583	)	$	138,004
Total assets	$	16,677,552	$	1,340,901	$	1,701,518		$	19,719,971
Nine months ended September 30, 2017
Net interest income	$	410,319	$	7,300	$	31,365		$	448,984
Provision for credit losses	16,054		674		1,222			17,950
Non-interest income	130,564		62,136		86,851			279,551
Non-interest expense (1)	337,289		41,711		106,515			485,515
Income tax expense	50,103		10,951		4,170			65,224
Net income	$	137,437	$	16,100	$	6,309		$	159,846
Total assets	$	16,406,714	$	1,307,459	$	2,402,362		$	20,116,535

⁽¹⁾  Includes merger related and repositioning expenses of $9.6 million and $29.9 million in the Banking and Mortgage Banking Segment, respectively, for the nine months endedSeptember 30, 2018 and $9.0 million in the Banking Segment for the nine months endedSeptember 30, 2017.

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Note 16.   Preferred Stock

On August 18, 2014, in connection with the Taylor Capital merger, the Company issued one share of its Perpetual Non-Cumulative Preferred Stock, Series A (“Company Series A Preferred Stock”), in exchange for each of the 4,000,000 outstanding shares of Taylor Capital’s Perpetual Non-Cumulative Preferred Stock, Series A. Holders of the Company Series A Preferred Stock were entitled to receive, when as and if declared by the Company’s board of directors, non-cumulative cash dividends on the liquidation preference amount, which was $25 per share, at a rate of 8.00% per annum, payable quarterly. The Company Series A Preferred Stock was included in Tier 1 capital for regulatory capital purposes. On February 15, 2018, the Company redeemed all of the 4,000,000 issued and outstanding shares of Company Series A Preferred Stock at a redemption price of $25.00 per share, or $100.0 million in the aggregate. The excess carrying amount of the Series A Preferred Stock in the amount of $15.3 million was retained in stockholders' equity and reflected as income available to common stockholders, which was included in the calculation of earnings per common share for the nine months ended September 30, 2018.

On November 22, 2017, the Company issued8,000,000depositary shares, each representing a 1/40th interest in a share of itsNon-Cumulative Preferred Stock, Series C (“Company Series C Preferred Stock”). Holders of the Company Series C Preferred Stock are entitled to receive, when as and if declared by the Company's board of directors, non-cumulative cash dividends on the liquidation preference, which is $25 per depositary share (equivalent to $1,000 per share of preferred stock), at a rate of 6.00% per annum, payable quarterly. The Company Series C Preferred Stock is included in Tier 1 capital for regulatory capital purposes and is redeemable at the option of the Company at a redemption price of $25 per depositary share, plus any declared and unpaid dividends, (i) in whole or in part from time to time, on any dividend payment date on or after November 25, 2022, and (ii) in whole but not in part prior to November 25, 2022, within 90 days following a “regulatory capital treatment event,” as defined in the terms of the Company Series C Preferred Stock. The Company must receive the approval of the Federal Reserve Board prior to any redemption of the Company Series C Preferred Stock.

Note 17. Definitive Merger Agreement

On May 20, 2018, the Company entered into an Agreement and Plan of Merger (the "Merger Agreement") with Fifth Third Bancorp, an Ohio corporation ("Fifth Third"), pursuant to which a newly formed subsidiary of Fifth Third will be merged with and into the Company, with the Company as the surviving corporation (the “Merger”).

At the effective time of the Merger (the "Effective Time"), each outstanding share of Company Common Stock will be converted into the right to receive (i) 1.45 shares of Fifth Third common stock ("Fifth Third Common Stock"), and (ii) $5.54 in cash (collectively, the "Merger Consideration"). The Company’s Series C Preferred Stock will remain outstanding and unchanged (except as modified by the Charter Amendment) as preferred stock of the Company, which will be a subsidiary of Fifth Third.

Pursuant to an amendment to the Company's charter (the "Charter Amendment"), effective immediately prior to consummation of the Merger, the holders of Company Series C Preferred Stock will have the right to vote with the holders of Company Common Stock as a single class on all matters submitted to a vote of such common stockholders. Upon completion of the Merger, Fifth Third, as the sole holder of Company Common Stock, will control the Company. Following completion of the Merger, the holders of Company Series C Preferred Stock will vote with Fifth Third as a single class on all matters submitted to a vote of Fifth Third, as the sole common stockholder of the Company. Thus, the voting rights that will be conferred upon the holders of Company Series C Preferred Stock by the Charter Amendment will continue to apply with respect to the Company, and not Fifth Third, following completion of the Merger.

At the Effective Time, each option granted by the Company to purchase shares of Company Common Stock (the "Company Options") will be converted into an option to purchase shares of Fifth Third Common Stock on the same terms and conditions as were applicable to such Company Options prior to the Merger, subject to certain adjustments to the exercise price and the number of shares of Fifth Third Common Stock issuable upon exercise of such option in accordance with the Merger Agreement. In addition, each Company restricted stock award, restricted stock unit and performance-based award (the "Company Equity Awards") that remains unvested and would not automatically vest by its terms at the Effective Time will be assumed by Fifth Third and converted into a number of shares of Fifth Third Common Stock (the "Assumed Equity Awards") with such shares being subject to certain adjustments in accordance with the Merger Agreement but otherwise remaining subject to the same terms and conditions as applicable immediately prior to such conversion. Each Company Equity Award that is outstanding immediately prior to the Effective Time that is not assumed under the Merger Agreement will be canceled and converted automatically into the right to receive the Merger Consideration.

On September 18, 2018, the Company received the requisite approvals of its common stockholders for the Merger. The Merger is subject to regulatory approvals and certain other customary closing conditions.

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Note 18. Subsequent Events

On October 7, 2018, the Company redeemed the junior subordinated notes held by American Chartered Statutory Trust II and, as a result, all of the issued and outstanding three month LIBOR + 2.75% American Chartered Statutory Trust II capital (preferred) securities were concurrently redeemed. The aggregate liquidation amount of these trust preferred securities was $10.0 million.

On October 23, 2018, the Company redeemed the junior subordinated notes held by FOBB Statutory Trust III and, as a result, all of the issued and outstanding three month LIBOR + 2.80% FOBB Statutory Trust III capital (preferred) securities were concurrently redeemed. The aggregate liquidation amount of these trust preferred securities was $5.0 million.

For additional information regarding these securities, see Note 10. Junior Subordinated Notes Issued to Capital Trusts.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following is a discussion and analysis of MB Financial, Inc.’s financial condition and results of operations and should be read in conjunction with the consolidated financial statements and notes thereto appearing elsewhere in this report. The words “the Company,” “we,” “our” and “us” refer to MB Financial, Inc. and its consolidated subsidiaries, unless we indicate otherwise.

Overview

The profitability of our operations depends primarily on our net interest income after provision for credit losses, which is the difference between interest earned on interest earning assets and interest paid on interest bearing liabilities less provision for credit losses.  The provision for credit losses is dependent on changes in our loan portfolio and management’s assessment of the collectability of our loan portfolio as well as prevailing economic and market conditions.  

Our net income is also affected by non-interest income and non-interest expenses.  During the periods under report, non-interest income included revenue from our key fee initiatives: net lease financing revenue, treasury management fees, wealth management fees, card fees and capital markets and international banking fees. Non-interest income also included mortgage banking revenue, consumer and other deposit service fees, brokerage fees, loan service fees, increase in cash surrender value of life insurance, net gain (loss) on investment securities, net loss on disposal of other assets, and other operating income. During the periods under report, non-interest expenses included salaries and employee benefits expense, occupancy and equipment expense, computer services and telecommunication expense, advertising and marketing expense, professional and legal expense, other intangibles amortization expense, branch exit and facilities impairment charges, net loss (gain) on other real estate owned and other related expenses, loss on extinguishment of debt, and other operating expenses. Additionally, dividends on preferred shares reduced net income available to common stockholders, which, as discussed below, was more than offset during the nine months ended September 30, 2018 by a return from preferred stockholders resulting from the redemption during that period of our 8% Series A non-cumulative perpetual preferred stock.

Net interest income is affected by changes in the volume and mix of interest earning assets, interest earned on those assets, the volume and mix of interest bearing liabilities and interest paid on those liabilities. Non-interest income and non-interest expenses are impacted by growth of operations and growth in the number of loan and deposit accounts through both acquisitions and core banking and leasing business growth. Growth in operations affects other expenses primarily as a result of additional employee, branch facility and promotional marketing expense. Changes in the number of loan and deposit accounts affect other income, including service fees as well as other expenses such as computer services, supplies, postage, telecommunications and other miscellaneous expenses. Non-performing asset levels impact salaries and benefits, legal expenses and other real estate owned expenses.

On April 12, 2018, the Company announced the discontinuation of its national mortgage origination business, which includes substantially all originations outside of the Company's consumer banking footprint in the Chicagoland area. As a result, the Company continues to expect to incur one-time pre-tax costs of approximately $37 to $41 million during 2018 and 2019, of which approximately $29 million were already recognized in the nine months ended September 30, 2018, and to stop operating its mortgage business as a defined segment with separate Mortgage Banking Segment reporting in 2019. The first phase of staff reductions was completed in early July 2018, and staff reductions continued through the rest of the third quarter of 2018. The Company plans to continue originating residential mortgage loans in the greater Chicago area through its mortgage retail offices, retain the mortgage servicing asset as well as its mortgage servicing operation in Wilmington, Ohio, and continue holding residential mortgages on its balance sheet.

On May 20, 2018, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Fifth Third Bancorp, an Ohio corporation (“Fifth Third”). The Merger Agreement provides that upon the terms and subject to the conditions set forth therein, the Company will merge with a subsidiary of Fifth Third. On September 18, 2018, the Company received the necessary approvals of its common stockholders. The transaction is subject to regulatory approvals and certain other customary closing conditions. For additional information, see Note 17 of the notes to consolidated financial statements in Part I, Item 1 of this report.

The Company had net income of $42.7 million for the three months ended September 30, 2018 compared to $60.8 million for the three months ended September 30, 2017. Net income available to common stockholders was $39.7 million for the three months ended September 30, 2018 compared to $58.8 million for the three months ended September 30, 2017. Fully diluted earnings per common share were $0.47 for the three months ended September 30, 2018 compared to $0.69 per common share for the three months ended September 30, 2017.

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The results of operations for the three months ended September 30, 2018 were impacted by the following compared to the same period in 2017:

• a $4.9 million increase in net interest income as a result of higher average loan balances driven by growth in commercial loans, higher loan yields, and lower borrowings partly offset by lower loan balances held for sale and higher funding costs;

• a $17.0 million increase in provision for credit losses as a result of higher charge offs during the quarter due to one loan relationship;

• a $16.1 million decrease in non-interest income due to a decrease in mortgage banking revenue as a result of lower mortgage origination volume attributable to the discontinuation of our national mortgage origination business;

• a $12.3 million increase in merger related and repositioning expenses as a result of the discontinuation of our national mortgage origination business and the pending merger with Fifth Third;

• a $6.3 million loss on extinguishment of debt due to the redemptions of the junior subordinated notes held by TAYC Capital Trust II and Coal City Capital Trust I;

• a $13.0 million decrease in non-interest expense, excluding merger related and repositioning expenses and the loss on extinguishment of debt, due to the lower salaries and employee benefits and other operating expenses as a result of the discontinuation of our national mortgage origination business;

• $2.2 million in tax benefits related to a reversal of deferred tax liabilities as a result of the decrease in Federal income tax rate due to H.R. 1, originally known as the "Tax Cuts and Jobs Act" (the "TCJ Act"), which was enacted in the fourth quarter of 2017; and

• a lower effective tax rate as a result of the TCJ Act.

The Company had net income of $138.0 million for the nine months endedSeptember 30, 2018 compared to $159.8 million for the nine months endedSeptember 30, 2017. Net income available to common stockholders was $144.2 million for the nine months endedSeptember 30, 2018 compared to $153.8 million for the nine months endedSeptember 30, 2017. Fully diluted earnings per common share were $1.69 for the nine months endedSeptember 30, 2018 compared to $1.81 per common share for the nine months endedSeptember 30, 2017. Net income available to common stockholders and diluted earnings per common share in the nine months endedSeptember 30, 2018 were positively impacted by a $15.3 million, or $0.18 per common share, return from preferred stockholders due to the redemption of all $100.0 million of our 8% Series A non-cumulative perpetual preferred stock. The $15.3 million represents the excess carrying amount over the redemption price of the Series A preferred stock.

The results of operations for the nine months ended September 30, 2018 were impacted by the following compared to the same period in 2017:

• a $25.3 million increase in net interest income as a result of higher average loan balances driven by growth in commercial and commercial real estate loans and higher loan yields partly offset by a lower tax benefit on municipal investment securities and tax exempt loans as a result of the TCJ Act and higher funding costs;

• a $17.3 million increase in provision for credit losses as a result of higher charge offs during the third quarter of 2018 due to one loan relationship;

• a $18.6 million decrease in non-interest income due to a decrease in mortgage banking revenue as a result of lower mortgage origination volume attributable to the discontinuation of our national mortgage origination business partly offset by an increase in lease financing revenue, net, and stronger earnings from investments in Small Business Investment Companies ("SBIC");

• a $30.5 million increase in merger related and repositioning expenses as a result of the discontinuation of our national mortgage origination business and the pending merger with Fifth Third;

• a $9.4 million loss on extinguishment of debt due to the redemption of the junior subordinated notes held by American Chartered Statutory Trust I, TAYC Capital Trust II, and and Coal City Capital Trust I;

• $5.5 million in tax benefits related to a reversal of deferred tax liabilities as a result of the decrease in Federal income tax rate due to the TCJ Act; and

• a lower effective tax rate as a result of the TCJ Act.

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Critical Accounting Policies

Our consolidated financial statements are prepared in conformity with accounting principles generally accepted in the United States of America and follow general practices within the industries in which we operate.  This preparation requires management to make estimates, assumptions, and judgments that affect the amounts reported in the financial statements and accompanying notes.  These estimates, assumptions, and judgments are based on information available as of the date of the financial statements; accordingly, as this information changes, actual results could differ from the estimates, assumptions, and judgments reflected in the financial statements.  Certain policies inherently have a greater reliance on the use of estimates, assumptions, and judgments and, as such, have a greater possibility of producing results that could be materially different than the results originally expected.  Management believes the following policies are both important to the portrayal of our financial condition and results of operations and require subjective or complex judgments; therefore, management considers the following to be critical accounting policies.  Management has reviewed the application of these polices with the Audit Committee of our Board of Directors.

Allowance for Loan and Lease Losses.  The allowance for loan and lease losses is subject to the use of estimates, assumptions, and judgments in management's evaluation process used to determine the adequacy of the allowance for loan and lease losses, which combines several factors: management's ongoing review and grading of the loan portfolio, consideration of past loan loss experience, trends in past due and non-performing loans, risk characteristics of the various classifications of loans, existing economic conditions, the fair value of underlying collateral, and other qualitative and quantitative factors which could affect probable credit losses. Because current economic conditions can change and future events are inherently difficult to predict, the anticipated amount of estimated loan losses, and therefore the adequacy of the allowance, could change significantly. As an integral part of their examination process, various regulatory agencies also review the allowance for loan and lease losses. Such agencies may require that certain loan balances be charged off when their credit evaluations differ from those of management or require that adjustments be made to the allowance for loan and lease losses, based on their judgments about information available to them at the time of their examination. We believe the allowance for loan and lease losses is appropriate and properly recorded in the financial statements.  See “Allowance for Loan and Lease Losses” section below for further analysis.

Residual Value of Our Direct Finance, Leveraged, and Operating Leases.  Lease residual value represents the present value of the estimated fair value of the leased equipment at the termination date of the lease.  Realization of these residual values depends on many factors, including management’s use of estimates, assumptions, and judgment to determine such values.  Several other factors outside of management’s control may reduce the residual values realized, including general market conditions at the time of expiration of the lease, whether there has been technological or economic obsolescence or unusual wear and tear on, or use of, the equipment and the cost of comparable equipment.  If, upon the expiration of a lease, we sell the equipment and the amount realized is less than the recorded value of the residual interest in the equipment, we will recognize a loss reflecting the difference.  On a quarterly basis, management reviews the lease residuals for potential impairment.  If we fail to realize our aggregate recorded residual values, our financial condition and profitability could be adversely affected. The aggregate residual value of the equipment leased under our direct finance, leveraged, and operating leases totaled $195.2 million at September 30, 2018 and $214.3 million at December 31, 2017.  See Note 1 and Note 6 to the audited consolidated financial statements contained in our Annual Report Form 10-K for the year ended December 31, 2017 for additional information.

Income Tax Accounting.  ASC Topic 740 provides guidance on accounting for income taxes by prescribing the minimum recognition threshold that a tax position must meet to be recognized in the financial statements. ASC Topic 740 also provides guidance on measurement, recognition, classification, interest and penalties, accounting in interim periods, disclosure and transition.  As of September 30, 2018, the Company had $105 thousand in uncertain tax positions.  The Company elects to treat interest and penalties recognized for the underpayment of income taxes as income tax expense.  However, interest and penalties imposed by taxing authorities on issues specifically addressed in ASC Topic 740 will be taken out of the tax reserves up to the amount allocated to interest and penalties.  The amount of interest and penalties exceeding the amount allocated in the tax reserves will be treated as income tax expense.  The application of income tax law is inherently complex.  Laws and regulations in this area are voluminous and are often ambiguous.  As such, we are required to make many subjective assumptions and judgments regarding our income tax exposures.  Interpretations of, and guidance surrounding income tax laws and regulations change over time.  As such, changes in our subjective assumptions and judgments can materially affect amounts recognized in the consolidated balance sheets and statements of operations.

Fair Value of Assets and Liabilities.  ASC Topic 820 defines fair value as the price that would be received to sell a financial asset or paid to transfer a financial liability in an orderly transaction between market participants at the measurement date.

The degree of management judgment involved in determining the fair value of assets and liabilities is dependent upon the availability of quoted market prices or observable market parameters. For financial instruments that trade actively and have quoted market prices or observable market parameters, there is minimal subjectivity involved in measuring fair value. When observable market prices and parameters are not fully available, management judgment is necessary to estimate fair value. In

55

addition, changes in market conditions may reduce the availability of quoted prices or observable data. For example, reduced liquidity in the capital markets or changes in secondary market activities could result in observable market inputs becoming unavailable. Therefore, when market data is not available, the Company would use valuation techniques requiring more management judgment to estimate the appropriate fair value measurement. 

See Note 12 to the consolidated financial statements in Part I, Item 1 of this report for a complete discussion on the Company’s use of fair valuation of assets and liabilities and the related measurement techniques.

Goodwill.  The excess of the cost of an acquisition over the fair value of the net assets acquired, including core deposit and client relationship intangibles, constitutes goodwill.  See Note 6 to the consolidated financial statements in Part I, Item 1 of this report for further information regarding core deposit and client relationship intangibles.  The Company reviews goodwill to determine potential impairment annually, or more frequently if events and circumstances indicate that goodwill might be impaired, by comparing the carrying value of the reporting units with the fair value of the reporting units.

The Company’s annual assessment date for goodwill impairment testing is as of December 31. Goodwill is tested for impairment at the reporting unit level. The Company currently has three reporting units: Banking, Leasing, and Mortgage Banking.  The carrying amount of goodwill was $1.0 billion at September 30, 2018 and December 31, 2017. On April 12, 2018, the Company announced the discontinuation of its national mortgage origination business, which includes substantially all originations outside of the Company's consumer banking footprint in the Chicagoland area. As a result, the Company recorded an impairment loss in the amount of $3.6 million within the Mortgage Banking segment in the second quarter of 2018. No impairment losses were recognized during the nine months endedSeptember 30, 2017.

Value of Mortgage Servicing Rights. The Company originates and sells residential mortgage loans in the secondary market and may retain the right to service the loans sold. Servicing involves the collection of payments from individual borrowers and the distribution of those payments to the investors. Upon a sale of mortgage loans for which servicing rights are retained, the retained mortgage servicing rights asset is capitalized at the fair value of future net cash flows expected to be realized for performing servicing activities. Purchased mortgage servicing rights are recorded at the purchase price at the date of purchase and at fair value thereafter.

Mortgage servicing rights do not trade in an active market with readily observable prices. The Company determines the fair value of mortgage servicing rights by estimating the fair value of the future cash flows associated with the mortgage loans being serviced. Key economic assumptions used in measuring the fair value of mortgage servicing rights include, but are not limited to, prepayment speeds, discount rates, delinquencies and cost to service. The assumptions used in the valuation model are validated on a periodic basis. The fair value is validated on a quarterly basis with an independent third party. Material discrepancies between the internal valuation and the third party valuation are analyzed, and an internal committee determines whether or not an adjustment is required.

The Company has elected to account for mortgage servicing rights using the fair value option. Changes in the fair value are recognized in mortgage banking revenue on the Company's Consolidated Statements of Operations.

Recent Accounting Pronouncements.  Refer to Note 2 of our consolidated financial statements for a description of recent accounting pronouncements including the respective dates of adoption and anticipated effects on results of operations and financial condition.

Net Interest Income

The following table presents, for the periods indicated, the total dollar amount of interest income from average interest earning assets and the related yields, as well as the interest expense on average interest bearing liabilities, and the related costs, expressed both in dollars and rates (dollars in thousands).  The table below and the discussion that follows contain presentations of net interest income and net interest margin on a tax-equivalent basis, which is adjusted for the tax-favored status of income from certain loans and investments.  We believe this measure to be the preferred industry measurement of net interest income, as it provides a relevant comparison between taxable and non-taxable amounts. The table below and the discussion that follows also contains presentations of net interest margin on a tax equivalent basis excluding the effect of acquisition accounting discount accretion on loans acquired through the American Chartered and Taylor Capital mergers ("bank mergers").

Reconciliations of net interest income and net interest margin on a tax-equivalent basis and net interest margin on a tax-equivalent basis excluding the effect of acquisition accounting discount accretion on loans acquired through the bank mergers to net interest income and net interest margin in accordance with accounting principles generally accepted in the United States of America are provided in the table. For additional information, see "Non-GAAP Financial Information."

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	Three Months Ended September 30,
(dollars in thousands)	2018						2017
	Average				Yield/		Average				Yield/
	Balance		Interest		Rate		Balance		Interest		Rate
Interest Earning Assets:
Loans held for sale	$	196,180	$	1,608	3.28	%	$	725,899	$	6,651	3.67	%
Loans (1) (2)	13,559,172		166,583		4.83		13,288,369		148,788		4.41
Loans exempt from federal income taxes (3)	262,538		2,716		4.05		321,284		4,050		4.93
Taxable investment securities	1,455,771		10,366		2.85		1,445,619		8,440		2.34
Investment securities exempt from federal income taxes (3)	1,220,193		11,882		3.90		1,255,025		14,971		4.77
Federal funds sold	383		2		2.21		38		0		1.74
Other interest earning deposits	375,961		1,648		1.74		147,065		327		0.88
Total interest earning assets	17,070,198		$	194,805	4.50		17,183,299		$	183,227	4.21
Non-interest earning assets	2,907,225						2,762,556
Total assets	$	19,977,423					$	19,945,855
Interest Bearing Liabilities:
Deposits:
NOW, money market and interest bearing deposits	$	5,042,158	$	10,183	0.80	%	$	4,740,210	$	4,485	0.38	%
Savings deposits	1,172,627		919		0.31		1,094,625		289		0.10
Time deposits	2,399,286		9,383		1.55		2,239,088		6,091		1.08
Short-term borrowings	611,907		2,317		1.50		1,838,284		5,148		1.11
Long-term borrowings and junior subordinated notes	853,669		7,089		3.24		553,924		3,610		2.50
Total interest bearing liabilities	10,079,647		$	29,891	1.17		10,466,131		$	19,623	0.74
Non-interest bearing deposits	6,418,925						6,337,955
Other non-interest bearing liabilities	524,447						479,488
Stockholders’ equity	2,954,404						2,662,281
Total liabilities and stockholders’ equity	$	19,977,423					$	19,945,855
Net interest income/interest rate spread (4)			$	164,914	3.33	%			$	163,604	3.47	%
Less: taxable equivalent adjustment			3,066						6,657
Net interest income, as reported			$	161,848					$	156,947
Net interest margin (5)					3.74	%					3.60	%
Tax equivalent effect					0.07	%					0.16	%
Net interest margin on a fully tax equivalent basis (non-GAAP) (5)					3.81	%					3.76	%
Effect of acquisition accounting discount accretion on loans acquired through bank mergers					(0.11	)%					(0.20	)%
Net interest margin on a fully tax equivalent basis, excluding the effect of acquisition accounting discount accretion on loans acquired through bank mergers (non-GAAP) (5)					3.70	%					3.56	%

(1)       Non-accrual loans are included in average loans.

(2)       Interest income includes amortization of net deferred loan origination fees and costs.

(3)       Non-taxable loan and investment income is presented on a fully tax equivalent basis assuming a Federal tax rate of 21% for 2018 and 35% for 2017.

(4)       Interest rate spread represents the difference between the average yield on interest earning assets and the average cost of interest bearing liabilities and is presented on a fully tax equivalent basis.

(5)       Net interest margin represents net interest income as a percentage of average interest earning assets.

Net interest income on a fully tax equivalent basis increased$1.3 million during the three months ended September 30, 2018 compared to the three months ended September 30, 2017 due to higher average loan balances driven by growth in commercial loans, higher loan yields, and lower borrowings partly offset by lower loan balances held for sale, higher funding costs, and a lower tax benefit on municipal investment securities and tax exempt loans as a result of the TCJ Act. The average yield on loans and funding costs increased as a result of an increase in short-term rates. Average borrowings decreased due to the discontinuation of our national mortgage origination business resulting in lower loan balances held for sale, which are typically funded by borrowings. In addition, the redemption of the junior subordinated notes held by American Chartered Statutory Trust I and TAYC Capital Trust II reduced borrowings.

The net interest margin, expressed on a fully tax equivalent basis, was 3.81% for the third quarter of 2018 and 3.76% for the third quarter of 2017. Net interest income in the third quarter of 2018 included interest income of $4.6 million resulting from the accretion of the acquisition accounting discount recorded on loans acquired in bank mergers compared to $7.9 million in the third quarter of 2017. Excluding the accretion of the acquisition accounting discount recorded on loans acquired in bank mergers, our net interest margin on a fully tax equivalent basis would have been 3.70% and 3.56% for the three months ended September 30, 2018 and September 30, 2017, respectively. The increase in our net interest margin on a fully tax equivalent basis was due to higher loan yields and a favorable mix in liabilities partly offset by increased funding costs and a lower tax benefit on municipal investment securities and tax exempt loans as a result of the TCJ Act, which was enacted in the fourth quarter of 2017.

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	Nine Months Ended September 30,
(dollars in thousands)	2018						2017
	Average				Yield/		Average				Yield/
	Balance		Interest		Rate		Balance		Interest		Rate
Interest Earning Assets:
Loans held for sale	$	437,060	$	11,468	3.50	%	$	626,000	$	17,118	3.65	%
Loans (1) (2)	13,583,096		478,243		4.66		12,817,685		415,485		4.29
Loans exempt from federal income taxes (3)	272,117		8,540		4.14		351,763		12,773		4.79
Taxable investment securities	1,410,815		28,878		2.73		1,525,546		26,279		2.30
Investment securities exempt from federal income taxes (3)	1,222,992		35,825		3.91		1,265,378		45,449		4.79
Federal funds sold	241		4		2.16		74		1		1.41
Other interest earning deposits	211,113		2,021		1.28		121,783		753		0.83
Total interest earning assets	17,137,434		$	564,979	4.37		16,708,229		$	517,858	4.11
Non-interest earning assets	2,887,097						2,741,325
Total assets	$	20,024,531					$	19,449,554
Interest Bearing Liabilities:
Deposits:
NOW and money market deposit	$	4,931,411	$	24,150	0.65	%	$	4,592,898	$	10,391	0.30	%
Savings deposit	1,196,811		2,621		0.29		1,113,044		789		0.09
Time deposits	2,450,226		26,132		1.43		2,146,564		15,953		0.99
Short-term borrowings	739,166		7,602		1.38		1,678,537		11,440		0.91
Long-term borrowings and junior subordinated notes	876,417		20,859		3.12		532,176		9,923		2.42
Total interest bearing liabilities	10,194,031		$	81,364	1.06		10,063,219		$	48,496	0.64
Non-interest bearing deposits	6,376,069						6,294,974
Other non-interest bearing liabilities	503,993						465,268
Stockholders’ equity	2,950,438						2,626,093
Total liabilities and stockholders’ equity	$	20,024,531					$	19,449,554
Net interest income/interest rate spread (4)			$	483,615	3.31	%			$	469,362	3.47	%
Less: taxable equivalent adjustment			9,317						20,378
Net interest income, as reported			$	474,298					$	448,984
Net interest margin (5)					3.66	%					3.56	%
Tax equivalent effect					0.08	%					0.16	%
Net interest margin on a fully tax equivalent basis (non-GAAP) (5)					3.74	%					3.72	%
Effect of acquisition accounting discount accretion on loans acquired through bank mergers					(0.12	)%					(0.19	)%
Net interest margin on a fully tax equivalent basis, excluding the effect of acquisition accounting discount accretion on loans acquired through bank mergers (non-GAAP)					3.62	%					3.53	%

(1)       Non-accrual loans are included in average loans.

(2)       Interest income includes amortization of net deferred loan origination fees and costs.

(3)       Non-taxable loan and investment income is presented on a fully tax equivalent basis assuming a Federal tax rate of 21% for 2018 and 35% for 2017.

(4)       Interest rate spread represents the difference between the average yield on interest earning assets and the average cost of interest bearing liabilities and is presented on a fully tax equivalent basis.

(5)       Net interest margin represents net interest income as a percentage of average interest earning assets.

Net interest income on a fully tax equivalent basis increased$14.3 million during the nine months endedSeptember 30, 2018 compared to the nine months endedSeptember 30, 2017. This increase was due to higher average loan balances driven by growth in commercial and commercial real estate loans and higher loan yields partly offset by a lower tax benefit on municipal investment securities and tax exempt loans as a result of the TCJ Act and higher funding costs. The average yield on loans and funding costs increased as a result of an increase in short-term rates.

The net interest margin, expressed on a fully tax equivalent basis, was 3.74% for the nine months endedSeptember 30, 2018 and 3.72% for the nine months endedSeptember 30, 2017. Net interest income in the nine months endedSeptember 30, 2018 included interest income of $13.8 million resulting from the accretion of the acquisition accounting discount recorded on loans acquired in bank mergers compared to $21.8 million in the same period of 2017. Excluding the accretion of the acquisition accounting discount recorded on loans acquired in bank mergers, our net interest margin on a fully tax equivalent basis would have been 3.62% and 3.53% for the nine months endedSeptember 30, 2018 and 2017, respectively. The increase in our net interest margin on a fully tax equivalent basis was due to higher loan yields and a favorable mix in liabilities partly offset by increased funding costs and a lower tax benefit on municipal investment securities and tax exempt loans as a result of the TCJ Act.

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Non-interest Income

The following table presents non-interest income for the three months ended September 30, 2018 compared to the three months ended September 30, 2017 (in thousands):

	Three Months Ended
	September 30,
	2018			2017			Increase/ (Decrease)			Percentage Change
Non-interest income:
Mortgage banking revenue	$	9,916		$	28,242		$	(18,326	)	(64.9	)%
Lease financing revenue, net	25,205			23,148			2,057			8.9
Treasury management fees	15,226			14,508			718			4.9
Wealth management fees	9,089			8,702			387			4.4
Card fees	5,362			4,585			777			16.9
Capital markets and international banking fees	1,913			4,870			(2,957		)	(60.7	)
Consumer and other deposit service fees	3,051			3,424			(373		)	(10.9	)
Brokerage fees	1,138			1,004			134			13.3
Loan service fees	2,103			2,114			(11		)	(0.5	)
Increase in cash surrender value of life insurance	1,298			1,321			(23		)	(1.7	)
Net (loss) gain on investment securities	(85		)	83			(168		)	(202.4	)
Net loss on disposal of other assets	(32		)	(180		)	148			82.2
Other operating income	5,657			4,110			1,547			37.6
Total non-interest income	$	79,841		$	95,931		$	(16,090	)	(16.8	)%

Non-interest income decreased by $16.1 million, or 16.8%, for the three months ended September 30, 2018 compared to the three months ended September 30, 2017.

• Mortgage banking revenue decreased due to lower mortgage origination volume as a result of the discontinuation of the national mortgage origination business in the second quarter of 2018.

• Lease financing revenue increased due to higher residual gains, rental income, and syndication fees partly offset by lower fees from the sale of third-party equipment maintenance contracts and promotional income.

• Treasury management fees increased due to an increase in treasury management activity.

• Card fees increased due to higher sales and volume in prepaid card fees and higher credit card usage.

• Capital markets and international banking fees decreased due to fewer swap deals.

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The following table presents non-interest income for the nine months endedSeptember 30, 2018 compared to the nine months endedSeptember 30, 2017 (in thousands):

	Nine Months Ended
	September 30,
	2018			2017			Increase/ (Decrease)			Percentage Change
Non-interest income:
Mortgage banking revenue	$	53,889		$	86,850		$	(32,961	)	(38.0	)%
Lease financing revenue, net	72,833			62,967			9,866			15.7
Treasury management fees	45,448			43,696			1,752			4.0
Wealth management fees	27,179			25,720			1,459			5.7
Card fees	15,803			13,564			2,239			16.5
Capital markets and international banking fees	8,696			11,709			(3,013		)	(25.7	)
Consumer and other deposit service fees	8,892			10,072			(1,180		)	(11.7	)
Brokerage fees	3,052			3,379			(327		)	(9.7	)
Loan service fees	6,496			6,120			376			6.1
Increase in cash surrender value of life insurance	3,678			3,910			(232		)	(5.9	)
Net (loss) gain on investment securities	(345		)	451			(796		)	(176.5	)
Net loss on sale of assets	(786		)	(307		)	(479		)	(156.0	)
Other operating income	16,114			11,420			4,694			41.1
Total non-interest income	$	260,949		$	279,551		$	(18,602	)	(6.7	)%

Non-interest income decreased by $18.6 million, or 6.7%, for the nine months endedSeptember 30, 2018 compared to the nine months endedSeptember 30, 2017.

• Mortgage banking revenue decreased due to lower mortgage origination volume as a result of the discontinuation of the national mortgage origination business.

• Lease financing revenue increased due to higher residual gains, promotional income, and syndication fees.

• Treasury management fees increased due to an increase in treasury management activity.

• Wealth management fees increased due to the addition of new customers.

• Card fees increased due to higher sales and volume in prepaid card fees and higher credit card usage.

• Capital markets and international banking fees decreased due to a decrease in swap and syndication fees.

• Consumer and other deposit service fees decreased due to lower NSF and overdraft fees.

• Other operating income increased as a result of stronger earnings from investments in SBICs.

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Non-interest Expenses

The following table presents non-interest expense for the three months ended September 30, 2018 compared to the three months ended September 30, 2017 (in thousands):

	Three Months Ended
	September 30,
	2018		2017			Increase/ (Decrease)			Percentage Change
Non-interest expenses:
Salaries and employee benefits expense	$	101,885	$	105,815		$	(3,930	)	(3.7	)%
Occupancy and equipment expense	16,117		15,382			735			4.8
Computer services and telecommunication expense	12,684		10,062			2,622			26.1
Advertising and marketing expense	3,432		2,558			874			34.2
Professional and legal expense	2,586		2,109			477			22.6
Other intangibles amortization expense	1,854		2,038			(184		)	(9.0	)
Branch exit and facilities impairment charges	3,292		2,773			519			18.7
Net loss recognized on other real estate owned and other expense	248		(86		)	334			388.4
Loss on extinguishment of debt	6,255		—			6,255			100.0
Other operating expenses	20,191		22,310			(2,119		)	(9.5	)
Total non-interest expenses	$	168,544	$	162,961		$	5,583		3.4	%

Non-interest expenses increased by $5.6 million, or 3.4%, for the three months ended September 30, 2018 from the three months ended September 30, 2017. Non-interest expenses include $13.9 million and $1.6 million in merger related and repositioning expenses for the three months ended September 30, 2018 and 2017, respectively. For the third quarter of 2018, approximately $10 million of the merger related and repositioning expenses related to the discontinuation of our national mortgage origination business and approximately $4 million related to the pending merger with Fifth Third.

Excluding merger related and repositioning expenses, non-interest expenses decreased by $6.8 million, or 4.2%, for the three months ended September 30, 2018 from the three months ended September 30, 2017. Explanations for changes other than merger related and repositioning expenses are as follows:

• Salaries and employee benefits expense decreased due to lower salaries and commission expense as a result of the discontinuation of the national mortgage origination business partly offset by higher health insurance costs due to an increase in claims.

• A $6.3 million loss on extinguishment of debt was recognized in the third quarter of 2018 due to the redemption of the junior subordinated notes held by TAYC Capital Trust II and Coal City Capital Trust I.

• Other operating expenses decreased due to lower filing and other loan expense resulting from lower mortgage origination volume attributable to the discontinuation of the national mortgage origination business.

The following table presents the detail of the merger related and repositioning expenses for the three months ended September 30, 2018 and 2017 (dollars in thousands):

	Three Months Ended
	September 30,
	2018		2017
Merger related and repositioning expenses (1):
Salaries and employee benefits	$	6,561	$	988
Occupancy and equipment expense	316		—
Computer services and telecommunication expense	2,648		(31		)
Advertising and marketing expense	278		—
Professional and legal expense	712		—
Branch exit and facilities impairment charges	3,292		1,014
Other operating expenses	120		(392		)
Total merger related and repositioning expenses	$	13,927	$	1,579

⁽¹⁾  Primarily includes costs incurred in connection with the pending merger with Fifth Third, the discontinuation of our national mortgage origination business, and the American Chartered merger.

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The following table presents non-interest expense for the nine months endedSeptember 30, 2018 compared to the nine months endedSeptember 30, 2017 (in thousands):

	Nine Months Ended
	September 30,
	2018		2017		Increase/ (Decrease)			Percentage Change
Non-interest expenses:
Salaries and employee benefits	$	331,877	$	309,932	$	21,945		7.1	%
Occupancy and equipment expense	49,997		45,710		4,287			9.4
Computer services and telecommunication expense	34,711		29,287		5,424			18.5
Advertising and marketing expense	10,637		8,964		1,673			18.7
Professional and legal expense	13,371		7,250		6,121			84.4
Other intangibles amortization expense	5,652		6,214		(562		)	(9.0	)
Branch exit and facilities impairment charges	3,632		8,680		(5,048		)	(58.2	)
Net loss recognized on other real estate owned and other expense	1,343		1,448		(105		)	(7.3	)
Loss on extinguishment of debt	9,391		—		9,391			100.0
Goodwill impairment loss	3,623		—		3,623			100.0
Other operating expenses	65,188		68,030		(2,842		)	(4.2	)
Total non-interest expenses	$	529,422	$	485,515	$	43,907		9.0	%

Non-interest expenses increased by $43.9 million, or 9.0%, for the nine months endedSeptember 30, 2018 from the nine months endedSeptember 30, 2017. Non-interest expenses include $39.5 million and $9.0 million in merger related and repositioning expenses for the nine months endedSeptember 30, 2018 and 2017, respectively. For the nine months endedSeptember 30, 2018 approximately $29 million of the merger related and repositioning expenses related to the discontinuation of our national mortgage origination business and approximately $10 million related to the pending merger with Fifth Third.

Excluding merger related and repositioning expenses, non-interest expenses increased by $13.4 million, or 2.8%, for the nine months ended September 30, 2018 from the nine months ended September 30, 2017. Explanations for changes other than merger related and repositioning expenses are as follows:

• Occupancy and equipment expense increased due to higher depreciation, as a result of our investment in our buildings and technology, and higher rental expenses, as a result of the office locations from the mortgage banking acquisition.

• Computer services and telecommunication expense increased due to investments in technology and infrastructure.

• Advertising and marketing expense increased due to media advertisement and sponsorship expense.

• Professional and legal expense increased due to case settlements and other legal and professional fees.

• A $9.4 million loss on extinguishment of debt was recognized due to the redemption of the junior subordinated notes held by American Chartered Statutory Trust I, TAYC Capital Trust II, and Coal City Capital Trust I.

• Other operating expenses decreased due to lower filing and other loan expense resulting from lower mortgage origination volume attributable to the discontinuation of the national mortgage origination business.

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The following table presents the detail of the merger related and repositioning expenses for the nine months ended September 30, 2018 and 2017 (dollars in thousands):

	Nine Months Ended
	September 30,
	2018		2017
Merger related and repositioning expenses (1):
Salaries and employee benefits	$	24,628	$	2,154
Occupancy and equipment expense	352		10
Computer services and telecommunication expense	2,648		230
Advertising and marketing expense	304		—
Professional and legal expense	4,169		100
Branch exit and facilities impairment charges	3,632		6,921
Goodwill impairment loss (2)	3,623		—
Other operating expenses	159		(412		)
Total merger related and repositioning expenses	$	39,515	$	9,003

⁽¹⁾  Primarily includes costs incurred in connection with the pending merger with Fifth Third, the discontinuation of our national mortgage origination business, and the American Chartered merger.

⁽²⁾  Represents the goodwill impairment charge within the Mortgage Banking Segment in the second quarter of 2018.

Income Taxes

Income tax expense for the nine months endedSeptember 30, 2018 was $32.6 million compared to $65.2 million for the nine months endedSeptember 30, 2017. The decrease was due to the decrease in the effective tax rate resulting from the TCJ Act for nine months endedSeptember 30, 2018.

The following table presents information on our income tax rate (dollars in thousands):

	Nine Months Ended
	September 30,
	2018			2017
Income before income taxes - as reported	$	170,595		$	225,070
Tax at Federal statutory rate (21% for 2018 and 35% for 2017)	35,825			78,775
Increase (decrease) due to:
Tax exempt income, net	(7,973		)	(14,379		)
State tax expense, net of Federal impact	9,403			9,592
Other items, net	1,715			266
Tax expense before discrete items	38,970			74,254
Income tax rate before discrete items (effective tax rate)	22.8		%	33.0		%
Discrete tax expense (benefit) items (1)	(838		)	(4,602		)
Discrete tax benefit - corporate Federal tax rate changes (2)	(5,541		)	—
Discrete tax benefit - corporate state tax rate changes (3)	—			(2,324		)
Discrete tax expense (benefit) - merger related items (4)	—			(2,104		)
Income tax expense - as reported	$	32,591		$	65,224
Income tax rate	19.1		%	29.0		%

⁽¹⁾  Includes tax benefits on the vesting of restricted shares, exercise of options, and other compensation.

⁽²⁾  Includes the impact of the Federal income tax rate decrease due to the TCJ Act (enacted on December 22, 2017) on our net deferred tax liabilities. The re-measurement of our net deferred tax liabilities due to the TCJ Act was determined to be provisional at September 30, 2018. We expect to finalize the re-measurement of our net deferred tax liabilities due to the TCJ Act in the fourth quarter of 2018.

⁽³⁾  Includes the tax benefit due to the impact of the Illinois state income tax rate increase (effective July 1, 2017) on our deferred tax assets.

⁽⁴⁾  Includes reversals of a tax liability no longer needed specifically related to two entities we acquired and certain non-deductible merger related items.

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Operating Segments

The Company's operations currently consist of three reportable operating segments: Banking, Leasing and Mortgage Banking. Our Banking Segment generates revenues primarily from its lending, deposit gathering and fee business activities. Our Leasing Segment generates revenues through lease originations and related services. Our Mortgage Banking Segment originates residential mortgage loans for sale to investors through its retail and third party origination channels as well as residential mortgage loans held in our loan portfolio. The Mortgage Banking Segment also services residential mortgage loans owned by investors and the Company. As a result of the discontinuation of our national mortgage origination business, we expect to stop operating the mortgage business as a defined segment with separate Mortgage Banking Segment reporting in 2019.

Three Month Comparison

Net income from our Banking Segment for the three months ended September 30, 2018decreased$10.9 million to $41.7 million compared to the three months ended September 30, 2017. The decrease in net income was due to an increase in provision for credit losses (higher charge offs during the quarter due to one loan relationship), a decrease in capital markets and international banking fees (fewer swap deals), and an increase in salaries and benefits (higher bonus and health insurance costs). These unfavorable variances were partly offset by higher net interest income, increased lease financing revenue, net (higher earnings from investments in leasing companies and residual gains), and higher card fees (increased sales and volume in prepaid and higher credit card usage).

The increase in net interest income at our Banking Segment was due to higher average loan balances driven by growth in commercial loans and higher loan yields partly offset by higher funding costs. The average yield on loans and funding costs increased as a result of an increase in short-term rates. In addition, the Banking Segment was favorably impacted by a lower effective tax rate due to the TCJ Act. Merger related and repositioning expenses were $4.2 million for the three months ended September 30, 2018 compared to $1.6 million for the same period in the prior year.

Net income from our Leasing Segment for the three months ended September 30, 2018increased$1.1 million to $7.1 million compared to the three months ended September 30, 2017. This increase in net income was due to an increase in other non-interest income (favorable currency translation adjustment) and lower income tax expense (lower effective tax rate due to the TCJ Act) partly offset by increased salaries and employee benefits expense (the investment in sales and other revenue generating staff).

Compared to the three months ended September 30, 2017, net income from our Mortgage Banking Segment decreased$8.3 million to a loss of $6.1 million for the three months ended September 30, 2018. Net income was impacted by the discontinuation of our national mortgage origination business resulting in lower origination revenue and non-interest expenses. Merger related and repositioning expenses were $9.8 million for the three months ended September 30, 2018.

Nine Month Comparison

Net income from our Banking Segment for the nine months endedSeptember 30, 2018decreased$1.3 million to $136.1 million compared to the nine months endedSeptember 30, 2017. The decrease in net income was due to the increase in provision for credit losses and non-interest expenses partly offset by the increase in net interest income, higher card fees (increased sales and volume in prepaid cards and higher credit card usage), and stronger earnings in SBIC investments.

The increase in net interest income at our Banking Segment was due to higher average loan balances driven by growth in commercial and commercial real estate loans and higher loan yields partly offset by a lower tax benefit on municipal investment securities and tax exempt loans as a result of the TCJ Act and higher funding costs. The average yield on loans and funding costs increased as a result of an increase in short-term rates. The increase in provision for credit losses resulted from higher charge offs during the third quarter of 2018 due to one loan relationship.

Non-interest expense at our Banking segment increased as a result of higher salaries and employee benefits expense, occupancy and equipment expense (higher building and software depreciation), computer services and telecommunication expense (previous investments in new technology), and professional and legal fees (case settlements and other legal and professional fees). Salaries and employee benefits expense increased due to annual salary increases, new hires, higher health insurance costs, and higher bonus and stock based compensation expense. In addition, the Banking Segment was favorably impacted by a lower effective tax rate due to the TCJ Act. Merger related and repositioning expenses were $9.6 million for the nine months endedSeptember 30, 2018 compared to $9.0 million for the same period in the prior year.

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Net income from our Leasing Segment for the nine months endedSeptember 30, 2018increased$10.4 million to $26.5 million compared to the nine months endedSeptember 30, 2017. This increase in net income was due to higher lease financing revenue partly offset by increased salaries and employee benefits expense (due to the investment in sales and other revenue generating staff). Lease financing revenue increased due to higher residual gains, promotional income, and syndication fees. The Leasing Segment was also favorably impacted by a $3.8 million reversal of a deferred tax liability as a result of the decrease in Federal income tax rate due to the TCJ Act as well as a lower effective tax rate.

Compared to the nine months endedSeptember 30, 2017, net income from our Mortgage Banking Segment decreased$30.9 million to a loss of $24.6 million for the nine months endedSeptember 30, 2018. Net income was impacted by the discontinuation of our national mortgage origination business resulting in lower origination revenue and non-interest expenses. Merger related and repositioning expenses were $29.9 million for the nine months ended September 30, 2018.

Balance Sheet

Total assets decreased$367.0 million, or 1.8%, to $19.7 billion at September 30, 2018 from December 31, 2017. 

• Investment securities increased$270.5 million, or 10.9%, from December 31, 2017 to September 30, 2018 due to the purchase of residential mortgage-backed securities during the nine months ended September 30, 2018.

• Loans held for sale decreased$496.7 million, or 90.6%, to $51.8 million from December 31, 2017 to September 30, 2018 due to the discontinuation of our national mortgage origination business.

• Total loans, excluding purchased credit-impaired loans, decreased by $2.4 million to $13.8 billion at September 30, 2018 from December 31, 2017.

Total liabilities decreased by $322.5 million, or 1.9%, to $16.8 billion at September 30, 2018 from December 31, 2017.

• Total deposits decreased by $249.6 million, or 1.7%, to $14.7 billion at September 30, 2018 from December 31, 2017 due to a decrease in non-interest bearing deposits partly offset by an increase in money market and NOW account balances.

• Total borrowings decreased by $88.7 million, or 5.6%, to $1.5 billion at September 30, 2018 due to the redemption of the junior subordinated notes held by American Chartered Statutory Trust I, Coal City Capital Trust I, and TAYC Capital Trust II, as noted earlier.

Total stockholders’ equity decreased$44.5 million, or 1.5%, to $3.0 billion at September 30, 2018 compared to December 31, 2017 as a result of the redemption of all $100 million of our 8% Series A non-cumulative perpetual preferred stock partly offset by earnings for the nine months endedSeptember 30, 2018 net of dividends declared.

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Investment Securities

The following table sets forth the amortized cost and fair value of our investment securities, excluding marketable equity securities and non-marketable FHLB and FRB stock, by type of security as indicated (in thousands):

	September 30, 2018				December 31, 2017				September 30, 2017
	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
Available for sale
U.S. Government sponsored agencies and enterprises	$	5,087	$	5,002	$	23,013	$	23,007	$	23,077	$	23,146
States and political subdivisions	335,034		343,256		363,813		379,325		366,187		385,829
Residential mortgage-backed securities	1,344,270		1,316,274		861,594		852,699		878,167		875,260
Commercial mortgage-backed securities	41,070		41,040		71,554		72,035		86,411		87,217
Corporate bonds	5,065		5,064		70,155		70,197		114,581		115,014
Equity securities (1)	—		—		11,236		11,063		11,177		11,077
Total Available for Sale	1,730,526		1,710,636		1,401,365		1,408,326		1,479,600		1,497,543
Held to maturity
States and political subdivisions	899,865		909,294		878,400		910,512		888,576		924,052
Residential mortgage-backed securities	23,217		23,462		80,682		81,943		105,662		107,694
Total Held to Maturity	923,082		932,756		959,082		992,455		994,238		1,031,746
Total	$	2,653,608	$	2,643,392	$	2,360,447	$	2,400,781	$	2,473,838	$	2,529,289

⁽¹⁾  Reflected in marketable equity securities on the consolidated balance sheet following the adoption of the new guidance under ASC Topic 825 "Financial Instruments" on January 1, 2018.

Loan Portfolio

The following table sets forth the composition of our loan portfolio (excluding loans held for sale) as of the dates indicated showing the balances of legacy loans and loans acquired through the American Chartered and Taylor Capital mergers (dollars in thousands):

	September 30, 2018								December 31, 2017
	Legacy (1)		Acquired (2)		Total		% of Total		Legacy (1)		Acquired (2)		Total		% of Total
Commercial-related credits:
Commercial loans	$	4,813,906	$	122,630	$	4,936,536	35	%	$	4,532,153	$	254,027	$	4,786,180	34	%
Commercial loans collateralized by assignment of lease payments	2,051,474		14,114		2,065,588		15		2,077,972		35,163		2,113,135		15
Commercial real estate	3,295,681		536,351		3,832,032		28		3,370,590		776,939		4,147,529		30
Construction real estate	547,264		1,618		548,882		4		401,189		5,660		406,849		3
Total commercial-related credits	10,708,325		674,713		11,383,038		82		10,381,904		1,071,789		11,453,693		82
Other loans:
Residential real estate	1,220,286		182,801		1,403,087		10		1,212,120		220,338		1,432,458		10
Indirect vehicle	789,288		1,285		790,573		5		666,443		1,485		667,928		4
Home equity	152,999		28,478		181,477		1		165,297		53,801		219,098		2
Other consumer loans	85,431		274		85,705		1		72,742		399		73,141		1
Total other loans	2,248,004		212,838		2,460,842		17		2,116,602		276,023		2,392,625		17
Total loans excluding purchased credit-impaired loans	12,956,329		887,551		13,843,880		99		12,498,506		1,347,812		13,846,318		99
Purchased credit-impaired loans	60,980		30,092		91,072		1		79,066		40,678		119,744		1
Total loans	$	13,017,309	$	917,643	$	13,934,952	100	%	$	12,577,572	$	1,388,490	$	13,966,062	100	%

⁽¹⁾  Legacy loans include all loans other than those acquired through the American Chartered and Taylor Capital mergers, including loans acquired in connection with our FDIC-assisted transactions and our other acquisition transactions, as well as new loans originated subsequent to the American Chartered and Taylor Capital mergers, and American Chartered and Taylor Capital loans that have been renewed.

⁽²⁾  Represents loans acquired through the American Chartered and Taylor Capital mergers that have not yet been renewed. These balances will decrease to zero over time.

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Asset Quality

Non-performing loans include loans accounted for on a non-accrual basis and accruing loans contractually past due 90 days or more as to interest or principal. Management reviews the loan portfolio for problem loans on an ongoing basis. During the ordinary course of business, management becomes aware of borrowers that may not be able to meet the contractual requirements of loan agreements. These loans are placed under close supervision with consideration given to placing the loan on non-accrual status, increasing the allowance for loan and lease losses and (if appropriate) partial or full charge-off. After a loan is placed on non-accrual status, any interest previously accrued but not yet collected is reversed against current income. Generally, if interest payments are received on non-accrual loans, these payments will be applied to principal and not taken into income. Loans will not be placed back on accrual status unless back interest and principal payments are made. Our general policy is to place loans 90 days past due on non-accrual status, as well as those loans that continue to pay, but display a well-defined material weakness that we believe will result in a loss of principal and interest.

Non-performing loans exclude loans held for sale. Fair value of these loans includes estimates of credit losses.  

The following table sets forth the amounts of non-performing loans, non-performing assets and purchased credit-impaired loans (excluding loans held for sale and other real estate owned acquired as part of our FDIC-assisted transactions) as well as other information regarding asset quality at the dates indicated (dollars in thousands):

	September 30, 2018			December 31, 2017			September 30, 2017
Non-performing loans:
Non-accruing loans	$	72,437		$	71,238		$	49,926
Loans 90 days or more past due, still accruing interest	1,294			5,570			689
Total non-performing loans	73,731			76,808			50,615
Other real estate owned	10,933			9,736			13,020
Repossessed assets	870			589			497
Total non-performing assets	$	85,534		$	87,133		$	64,132
Purchased credit-impaired loans	$	91,072		$	119,744		$	131,919
Total allowance for loan and lease losses	$	155,411		$	157,710		$	159,128
Accruing restructured loans (1)	22,970			28,554			32,850
Total non-performing loans to total loans	0.53		%	0.55		%	0.36		%
Total non-performing assets to total assets	0.43			0.43			0.32
Allowance for loan and lease losses to total non-performing loans	210.78			205.33			314.39

⁽¹⁾  Accruing restructured loans consists of loans that have been modified and are performing in accordance with those modified terms.

A loan is classified as a troubled debt restructuring when a borrower is experiencing financial difficulties that leads to a restructuring of the loan, and the Company grants concessions to the borrower in the restructuring that it would not otherwise consider. These concessions may include rate reductions, principal forgiveness, extension of maturity date and other actions intended to minimize potential losses.  A loan that is modified at a market rate of interest may no longer be classified as troubled debt restructuring in the calendar year subsequent to the restructuring if it is in compliance with the modified terms.  Payment performance prior and subsequent to the restructuring is taken into account in assessing whether it is likely that the borrower can meet the new terms.  This may result in the loan being returned to accrual status at the time of restructuring.  A period of sustained repayment for at least six months generally is required for return to accrual status.

Non-performing assets consists of non-performing loans as well as other repossessed assets and other real estate owned.  Other real estate owned represents properties acquired through foreclosure or other proceedings and is recorded at fair value less the estimated cost of disposal at the date of acquisition.  Other real estate owned is evaluated regularly to ensure that the recorded amount is supported by its current fair value.  Valuation allowances to reduce the carrying amount to fair value less estimated costs of disposal are recorded as necessary.  Gains and losses and changes in valuations on other real estate owned are included in net gain (loss) recognized on other real estate within non-interest expense.  Expenses, net of rental income, from the operations of other real estate owned are reflected as a separate line item on the statement of operations.  Other repossessed assets primarily consist of repossessed vehicles.  Losses on repossessed vehicles are charged-off to the allowance when title is taken and the vehicle is valued.  Once the Bank obtains title, repossessed vehicles are not included in loans, but are classified as “other assets” on the consolidated balance sheets.  The typical holding period for resale of repossessed automobiles is less than 90 days unless significant

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repairs to the vehicle are needed which occasionally results in a longer holding period.  The typical holding period for motorcycles can be more than 90 days, as the average motorcycle re-sale period is longer than the average automobile re-sale period.  The longer average period for motorcycles is a result of cyclical trends in the motorcycle market.

Other real estate owned that is related to our FDIC-assisted transactions is excluded from non-performing assets. 

The following table presents a summary of other real estate owned, excluding assets related to FDIC-assisted transactions, for the nine months endedSeptember 30, 2018 and 2017 (in thousands):

	September 30,
	2018			2017
Beginning balance	$	9,736		$	26,279
Transfers in at fair value less estimated costs to sell	4,974			6,467
Fair value adjustments	(248		)	(2,120		)
Net gains on sales of other real estate owned	198			826
Cash received upon disposition	(3,727		)	(18,432		)
Ending balance	$	10,933		$	13,020

Potential Problem Loans

We define potential problem loans as performing loans rated substandard and that do not meet the definition of a non-performing loan (See “Asset Quality” section above for non-performing loans). We do not necessarily expect to realize losses on potential problem loans, but we recognize potential problem loans carry a higher probability of default and require additional attention by management. The following table sets forth the aggregate principal amount of potential problem loans at the dates indicated (in thousands):

	September 30, 2018		December 31, 2017
Commercial loans	$	123,029	$	89,836
Commercial loans collateralized by assignment of lease payments	5,372		9,407
Commercial real estate	115,505		74,023
Construction real estate	1,225		—
Total	$	245,131	$	173,266

Potential problem loans increased compared to December 31, 2017 due to migrations from the health care and asset-based lending portfolios. 

Allowance for Loan and Lease Losses

Management believes the allowance for loan and lease losses accounting policy is critical to the portrayal and understanding of our financial condition and results of operations. Selection and application of this “critical accounting policy” involves judgments, estimates, and uncertainties that are subject to change. In the event that different assumptions or conditions were to prevail, and depending upon the severity of such changes, materially different financial condition or results of operations is a reasonable possibility.

We maintain our allowance for loan and lease losses at a level that management believes is appropriate to absorb probable losses on existing loans based on an evaluation of the collectability of loans, underlying collateral, and prior loss experience.

Our allowance for loan and lease losses is comprised of three elements: a commercial-related general loss reserve; a commercial-related specific reserve for impaired loans; and a consumer related reserve for smaller-balance homogenous loans. Each element is discussed below.

Commercial-Related General Loss Reserve.  We maintain a general loan loss reserve for the four categories of commercial-related loans in our portfolio - commercial loans, commercial loans collateralized by the assignment of lease payments (lease loans), commercial real estate loans, and construction real estate loans. 

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Under our loan risk rating system, each commercial-related loan is risk rated between one and nine by the originating loan officer, Senior Credit Management, Loan Review or loan committee.  A loan rated "one" represents a loan least likely to default, while a loan rated "nine" represents a loss.  The probability of loans defaulting for each risk rating, sometimes referred to as default factors, is estimated based on the frequency with which loans migrate from one risk rating to another and to default status over time.  We use a loan loss reserve model that incorporates loan risk rating migrations and historical default data over a multi-year period to develop estimated default factors ("EDFs").  The model tracks annual loan rating migrations by loan type over the last 17 years and is adjusted to reflect average losses over an economic cycle. EDFs are updated annually in December.

EDFs are multiplied by individual loan balances in each risk-rating category and by a historical loss given default estimate for each loan type (which incorporates recoveries) to determine the appropriate allowance by loan type.  This approach is applied to the commercial, lease, commercial real estate, and construction real estate components of the portfolio.

To account for current economic conditions, the general allowance for loan and lease losses also includes macroeconomic factor adjustments.  Macroeconomic factors adjust the ALLL upward or downward based on the current point in the economic cycle using predictive economic data and are applied to the loan loss model through a separate allowance element for the commercial, commercial real estate, construction real estate and lease loan components.  To determine our macroeconomic factors, we use specific economic data that are deemed predictive of future credit losses. We tested over 20 economic variables (U.S. manufacturing index, unemployment rate, U.S. GDP growth, etc.). We review this data annually to determine that such relationships continue to exist. We currently use the following macroeconomic indicators in our macroeconomic factor computation:

• Commercial loans and lease loans:  BBB-rated debt yield and number of civilians unemployed for 27 weeks or more.

• Commercial real estate loans and construction loans:  M2 Money stock, the U.S. Commercial Real Estate Index and the University of Michigan Consumer Sentiment Index.

Using the indicators noted above, a net charge-off rate is estimated and compared to our cycle average rate, resulting in a macroeconomic adjustment factor.  The macroeconomic adjustment factor is applied to each commercial loan type.  Each year, we evaluate the predictive nature of the macroeconomic factors and re-calibrate the macroeconomic models as needed.

Management may also adjust for other qualitative factors such as loan growth, migration trends, portfolio characteristics, loan concentrations, changing legal and regulatory landscape as well as other similar factors.

The commercial-related general loss reserve was $137.2 million as of September 30, 2018 and $132.8 million as of December 31, 2017. Reserves on impaired commercial-related loans are included in the “Commercial-Related Specific Reserves” section below. 

Commercial-Related Specific Reserves.  Our allowance for loan and lease losses also includes specific reserves on impaired commercial loans. A loan is considered to be impaired when management believes, after considering collection efforts and other factors, the borrower’s financial condition is such that the collection of all contractual principal and interest payments due is doubtful.

At each quarter-end, impaired loans are reviewed individually, with adjustments made to the general calculated reserve for each loan as deemed necessary.  Specific adjustments are made depending on expected cash flows and/or the value of the collateral securing each loan.  Generally, the Company obtains a current external appraisal (within 12 months) on real estate secured impaired loans.  Our appraisal policy is designed to comply with the Interagency Appraisal and Evaluation Guidelines, most recently updated in December 2010. As part of our compliance with these guidelines, we maintain an internal Appraisal Review Department that engages and reviews all third party appraisals.

In addition, each impaired commercial loan with real estate collateral is reviewed quarterly by our appraisal department to determine that the most recent valuation remains appropriate during subsequent quarters until the next appraisal is received.  If considered necessary by our appraisal department, the appraised value may be further discounted to reflect current values. 

Other valuation techniques are also used to value non-real estate assets.  Discounts may be applied in the impairment analysis used for general business assets ("GBA").  Examples of GBA include accounts receivable, inventory, and any marketable securities pledged. The discount is used to reflect collection risk in the event of default that may not have been included in the valuation of the asset.

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The total commercial-related specific reserves component of the allowance was $1.2 million as of September 30, 2018 compared to $6.1 million as of December 31, 2017.

Consumer-Related Reserves.  Pools of homogeneous loans with similar risk and loss characteristics are also assessed for probable losses.  These loan pools include consumer, residential real estate, home equity, credit cards, and indirect vehicle loans.  Migration probabilities obtained from past due roll rate analyses and historical loss rates are applied to current balances to forecast charge-offs over a one-year time horizon. The reserves for consumer-related loans totaled $17.0 million at September 30, 2018 and $18.9 million at December 31, 2017.

We consistently apply our methodology for determining the appropriateness of the allowance for loan and lease losses but may adjust our methodologies and assumptions based on historical information related to charge-offs and management's evaluation of the loan portfolio. In this regard, we periodically review the following to validate our allowance for loan and lease losses: historical net charge-offs as they relate to prior periods' allowance for loan and lease loss, comparison of historical loan migration in past years compared to the current year, overall credit trends and ratios, any significant changes in loan concentrations, lending policies, and emerging impacts in the legal/regulatory landscape. In reviewing this data, we adjust qualitative factors within our allowance methodology to appropriately reflect any changes warranted by the validation process. Management believes it has established an allowance for probable loan losses as appropriate under GAAP.

We recorded a provision for credit losses of $85 thousand for acquired loans related to the non-purchased credit-impaired bank merger loans as accounted for in accordance with ASC Topic 310-20 for the nine months endedSeptember 30, 2018. No additional provisions were recorded on the purchase credit-impaired bank merger loans accounted for in accordance with ASC Topic 310-30.

The provision for credit losses for non-purchased credit-impaired loans bank merger loans is calculated using a process similar to the one used for the legacy portfolio. A general loan loss reserve is calculated for the non-purchased credit-impaired bank merger loans that have renewed and not renewed separately using the same loan loss reserve model used for the legacy loans. The general loan loss reserve is calculated for the four categories of commercial-related loans in our portfolio: commercial loans, commercial loans collateralized by the assignment of lease payments (lease loans), commercial real estate loans, and construction real estate loans. The probability of loans defaulting for each risk rating (referred to as default factors) is estimated based on the frequency with which loans migrate from one risk rating to another and to default status over time. The default factors are multiplied by individual loan balances in each risk rating category and again multiplied by an historical loss given default estimate for each loan type to determine the appropriate allowance. The bank merger loans are risk rated using the Company's rating methodology. The general loan loss reserve amount is adjusted upward to reflect uncertainty regarding the performance of the acquired portfolios due to our limited history with the borrowers.

For bank merger loans (non-purchased credit-impaired) that renewed during the period (quarter or year to date), the default factors were multiplied by the loan balance and loss given default estimate to calculate the required reserves. The amount of required reserves was recognized as a provision for credit losses in the statement of operations. For bank merger loans (non-purchased credit-impaired) that were not renewed subsequent to the merger consummation, the default factors were multiplied by the loan balance and the historical loss given default estimate. The resulting general loan loss reserve was compared to the remaining acquisition accounting discounts related to credit on the bank merger loans (non-purchased credit-impaired), with the excess recognized as a provision for credit losses in the statement of operations.

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The following table presents an analysis of the allowance for loan and lease losses for the periods presented (dollars in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2018			2017			2018			2017
Balance at beginning of period	$	164,578		$	156,297		$	159,408		$	141,842
Provision for credit losses	21,503			4,517			35,230			17,950
Charge-offs:
Commercial loans	20,895			235			23,831			1,103
Commercial loans collateralized by assignment of lease payments	7,181			188			7,897			188
Commercial real estate	704			31			5,801			1,378
Construction real estate	—			—			—			—
Residential real estate	76			541			805			901
Home equity	724			439			972			873
Indirect vehicles	1,726			1,097			4,878			3,438
Other consumer loans	294			299			954			1,243
Total charge-offs	31,600			2,830			45,138			9,124
Recoveries:
Commercial loans	639			719			1,143			3,568
Commercial loans collateralized by assignment of lease payments	846			—			1,246			712
Commercial real estate	424			1,432			1,515			2,312
Construction real estate	13			502			443			661
Residential real estate	121			38			217			624
Home equity	261			149			559			724
Indirect vehicles	554			498			2,397			1,715
Other consumer loans	80			82			399			420
Total recoveries	2,938			3,420			7,919			10,736
Net charge-offs (recoveries)	28,662			(590		)	37,219			(1,612		)
Allowance for credit losses	157,419			161,404			157,419			161,404
Allowance for unfunded credit commitments	(2,008		)	(2,276		)	(2,008		)	(2,276		)
Allowance for loan and lease losses	$	155,411		$	159,128		$	155,411		$	159,128
Total loans	$	13,934,952		$	13,885,378		$	13,934,952		$	13,885,378
Ratio of allowance to total loans	1.12		%	1.15		%	1.12		%	1.15		%
Ratio of net charge-offs (recoveries) to average loans (annualized)	0.82			(0.02		)	0.36			(0.02		)

Net charge-offs of $28.7 million were recorded in the three months ended September 30, 2018 compared to net recoveries of $590 thousand in the three months ended September 30, 2017. A provision for credit losses of $21.5 million was recorded for the three months ended September 30, 2018 compared to $4.5 million for the three months ended September 30, 2017. A provision for credit losses of $55 thousand was recorded for bank merger loans for the three months ended September 30, 2018 compared to a provision for credit losses of $1.1 million for bank merger loans for the three months ended September 30, 2017.

Net charge-offs of $37.2 million were recorded in the nine months endedSeptember 30, 2018 compared to net recoveries of $1.6 million in the nine months endedSeptember 30, 2017. A provision for credit losses of $35.2 million was recorded for the nine months endedSeptember 30, 2018 compared to $18.0 million for the nine months endedSeptember 30, 2017. A provision for credit losses of $85 thousand was recorded for bank merger loans for the nine months endedSeptember 30, 2018 compared to a provision for credit losses of $2.6 million for bank merger loans for the nine months endedSeptember 30, 2017.

The increase in provision for credit losses for the three and nine months ended September 30, 2018 compared to the same periods in 2017 was due to higher charge-offs during the third quarter of 2018 mostly due to one loan relationship being downgraded during that quarter.

Additions to the allowance for loan and lease losses, which are charged to earnings through the provision for credit losses, are determined based on a variety of factors, including specific reserves, current loan risk ratings, delinquent loans, historical loss experience and economic conditions in our market area. In addition, federal regulatory authorities, as part of the examination process, periodically review our allowance for loan and lease losses. The regulators may require us to record adjustments to the allowance level based upon their assessment of the information available to them at the time of examination. Although management

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believes the allowance for loan and lease losses is sufficient to cover probable losses inherent in the loan portfolio, there can be no assurance that the allowance will prove sufficient to cover actual loan losses.

We utilize an internal asset classification system as a means of reporting problem and potential problem assets. At scheduled meetings of the board of directors of MB Financial Bank, a watch list is presented, showing significant loan relationships listed as “Special Mention,” “Substandard,” and “Doubtful.” An asset is classified Substandard if it is inadequately protected by the current net worth and paying capacity of the obligor or the collateral pledged, if any. Substandard assets include those characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected. Assets classified as Doubtful have all the weaknesses inherent in those classified Substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. Assets classified as Loss are those considered uncollectible and viewed as valueless assets and have been charged-off. Assets that do not currently expose us to sufficient risk to warrant classification in one of the aforementioned categories, but possess weaknesses that deserve management's close attention are deemed to be Special Mention.

Our determination as to the classification of our assets and the amount of our valuation allowances is subject to review by the Office of the Comptroller of the Currency, MB Financial Bank's primary regulator, which can order the establishment of additional general or specific loss allowances. There can be no assurance that regulators, in reviewing our loan portfolio, will not request us to materially adjust our allowance for loan and lease losses. The Office of the Comptroller of the Currency, in conjunction with the other federal banking agencies, has adopted an interagency policy statement on the allowance for loan and lease losses. The policy statement provides guidance for financial institutions on both the responsibilities of management for the assessment and establishment of adequate allowances and guidance for banking agency examiners to use in determining the adequacy of general valuation guidelines. Generally, the policy statement recommends that (1) institutions have effective systems and controls to identify, monitor and address asset quality problems; (2) management has analyzed all significant factors that affect the collectability of the portfolio in a reasonable manner; and (3) management has established acceptable allowance evaluation processes that meet the objectives set forth in the policy statement. We analyze our process regularly, with modifications made if needed, and report those results four times per year at meetings of our board of directors. However, there can be no assurance that regulators, in reviewing our loan portfolio, will not request us to materially adjust our allowance for loan and lease losses at the time of their examination.

Although management believes that appropriate specific and general loan loss allowances have been established, actual losses are dependent upon future events and, as such, further additions to the level of specific and general loan and lease loss allowances may become necessary.

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Lease Investments

The lease portfolio is comprised of various types of equipment, generally technology related, health care, material handling, and general manufacturing equipment. 

Lease investments by categories follow (in thousands):

	September 30, 2018			December 31, 2017			September 30, 2017
Direct finance leases:
Minimum lease payments	$	444,353		$	492,953		$	450,748
Estimated unguaranteed residual values	62,933			74,220			69,152
Less: unearned income	(38,230		)	(41,311		)	(36,088		)
Direct finance leases (1)	$	469,056		$	525,862		$	483,812
Leveraged leases:
Minimum lease payments	$	—		$	179		$	267
Estimated unguaranteed residual values	10			10			54
Less: unearned income	—			(3		)	(5		)
Less: related non-recourse debt	—			(177		)	(263		)
Leveraged leases (1)	$	10		$	9		$	53
Operating leases:
Equipment, at cost	$	625,683		$	575,612		$	530,629
Less accumulated depreciation	(195,840		)	(166,561		)	(159,088		)
Lease investments, net	$	429,843		$	409,051		$	371,541

⁽¹⁾  Direct finance and leveraged leases are included as commercial loans collateralized by assignment of lease payments for financial statement purposes.

Leases that transfer substantially all of the benefits and risk related to the equipment ownership are classified as direct finance leases. If these direct finance leases have non-recourse debt associated with them and meet the additional requirements for a leveraged lease, they are further classified as leveraged leases, and the associated debt is netted with the outstanding balance in the consolidated financial statements. Interest income on direct finance and leveraged leases is recognized using methods which approximate a level yield over the term of the lease. Operating leases are investments in equipment leased to other companies, where the residual component makes up more than 10% of the investment.  The Company funds most of the lease equipment purchases internally, but has some loans at other banks which totaled $76.5 million at September 30, 2018, $76.3 million at December 31, 2017, and $73.6 million at September 30, 2017.

At September 30, 2018, the following reflects the residual values for leases by category in the year the initial lease term ends (in thousands):

	Residual Values
	Direct
End of initial lease term	Finance		Leveraged		Operating
December 31,	Leases		Leases		Leases		Total
2018	$	3,100	$	10	$	6,415	$	9,525
2019	8,027		—		12,205		20,232
2020	13,685		—		26,967		40,652
2021	6,397		—		21,902		28,299
2022	9,784		—		18,145		27,929
Thereafter	21,940		—		46,642		68,582
	$	62,933	$	10	$	132,276	$	195,219

The lease residual value represents the present value of the estimated fair value of the leased equipment at the termination of the lease. Lease residual values are reviewed annually, and any write-downs for permanent impairments deemed necessary are recorded in the period in which they become known. To mitigate this risk of loss, we seek to diversify both the type of equipment

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leased and the industries in which the lessees participate. In addition, a portion of our leases are terminal rental adjustment clause or "TRAC" leases where the lessee effectively guarantees the full residual value through a rental adjustment at the end of term or those where partial residual value is guaranteed ("split-TRAC"), which has a limited residual risk. Under a split-TRAC structure, the limited residual risk would be satisfied first by the net sale proceeds of the leased asset. The lessee’s at-risk portion, or top risk, is satisfied last and is subject to repayment as additional rent, if the TRAC amount is not satisfied by the net sale proceeds.

Often times, there are several individual lease schedules under one master lease.  There were 4,776 leases at September 30, 2018 compared to 4,773 at December 31, 2017.  The average residual value per lease schedule was approximately $41 thousand and $45 thousand at September 30, 2018 and December 31, 2017, respectively.  The average residual value per master lease schedule was approximately $166 thousand at September 30, 2018 and $183 thousand at December 31, 2017. Certain residual values have less than full residual risk.

Liquidity and Sources of Capital

Our cash flows are composed of three classifications: cash flows from operating activities, cash flows from investing activities, and cash flows from financing activities.

Cash flows from operating activities include net income, adjusted for items in net income that did not impact cash.  Net cash flows provided by operating activities were $693.7 million for the nine months endedSeptember 30, 2018 compared to net cash flows provided by operating activities of $290.9 million for the nine months endedSeptember 30, 2017. The change was mostly due to lower net proceeds of loans held for sale in the nine months endedSeptember 30, 2017.

Cash flows from investing activities reflects the impact of loans and investment securities acquired for the Company’s interest-earning asset portfolios, as well as cash flows from asset sales and the impact of acquisitions.  For the nine months endedSeptember 30, 2018, the Company had net cash flows used in investing activities of $323.3 million compared to net cash flows used in investing activities of $946.1 million for the nine months endedSeptember 30, 2017.  The change was mostly due to a small decrease in loans in the nine months ended September 30, 2018 compared to an increase in loans in the nine months endedSeptember 30, 2017 partly offset by an increase in purchases of investment securities during the nine months endedSeptember 30, 2018.

Cash flows from financing activities include transactions and events whereby cash is obtained from depositors, creditors or investors.  For the nine months endedSeptember 30, 2018, the Company had net cash flows used in financing activities of $518.9 million compared to net cash flows provided by financing activities of $635.5 million for the nine months endedSeptember 30, 2017.  The change in cash flows from financing activities was mostly due to the decrease in short-term borrowings, the redemption of our 8% Series A non-cumulative perpetual preferred stock and junior subordinated notes held by American Chartered Statutory Trust I and TAYC Capital Trust II, and a decrease in deposits during the nine months endedSeptember 30, 2018.

In the event that additional short-term liquidity is needed, we have established relationships with several large and regional banks to provide short-term borrowings in the form of federal funds purchases.  While, at September 30, 2018, there were no firm lending commitments in place, management believes that we could borrow approximately $357.5 million for a short time from these banks on a collective basis.  Additionally, we are a member of Federal Home Loan Bank of Chicago ("FHLB").  As of September 30, 2018, the Company had $698.9 million outstanding in FHLB advances, and could borrow an additional amount of approximately $504.6 million.  As a contingency plan for significant funding needs, the Asset/Liability Committee may also consider the sale of investment securities, selling securities under agreement to repurchase, or the temporary curtailment of lending activities.  As of September 30, 2018, the Company had approximately $1.9 billion of unpledged securities, excluding securities available for pledge at the FHLB.

Our main sources of liquidity at the holding company level are dividends from MB Financial Bank and cash on hand. We previously maintained a $35.0 million unsecured line of credit at the holding company level with a correspondent bank. No borrowings were outstanding on the line of credit as of September 30, 2018, and the line of credit matured on June 30, 2018. The holding company had $111.9 million in cash as of September 30, 2018.

See Notes 8 and 9 to the consolidated financial statements in Part I, Item 1 of this report for details of period end balances and other information for these various funding sources. There were no material changes outside the ordinary course of business in the Company’s contractual obligations at September 30, 2018 as compared to December 31, 2017.

MB Financial Bank is subject to various regulatory capital requirements which affect its ability to pay dividends to us.  Failure to meet minimum capital requirements can initiate certain mandatory and discretionary actions by regulators that, if undertaken, could have a direct material effect on our financial statements. The minimum ratios required for a bank to be considered

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“well capitalized” for regulatory purposes are a total risk-based capital ratio of 10.00%, a Tier 1 capital to risk-weighted assets ratio of 8.00%, a common equity Tier 1 capital to risk-weighted assets ratio of 6.50% and a Tier 1 capital to average assets ratio of 5.00%.   In addition, we have an internal policy which provides that dividends paid to us by MB Financial Bank cannot exceed an amount that would cause MB Financial Bank’s total risk-based capital ratio, Tier 1 capital to risk-weighted assets ratio, common equity Tier 1 capital to risk-weighted assets ratio and Tier 1 capital to average assets ratio to fall below 11%, 9%, 7.5% and 7%, respectively.  See “Item 1. Business — Supervision and Regulation” in our Annual Report on Form 10-K for the year ended December 31, 2017.

At September 30, 2018, the Company’s total risk-based capital ratio was 13.48%, Tier 1 capital to risk-weighted assets ratio was 10.96%, common equity Tier 1 capital to risk-weighted assets ratio was 9.83% and Tier 1 capital to average asset ratio was 9.99%. At September 30, 2018, MB Financial Bank’s total risk-based capital ratio was 12.83%, Tier 1 capital to risk-weighted assets ratio was 10.89%, common equity Tier 1 capital to risk-weighted assets ratio was 10.88% and Tier 1 capital to average asset ratio was 9.92%. MB Financial Bank was categorized as “Well-Capitalized” at September 30, 2018 under the regulations of the Office of the Comptroller of the Currency.

The Company and MB Financial Bank must maintain a capital conservation buffer consisting of additional common equity Tier 1 capital greater than 2.5% of risk-weighted assets above the required minimum levels in order to avoid limitations on paying dividends, repurchasing shares, and paying discretionary bonuses.  The new capital conservation buffer requirement began phasing in on January 1, 2016 when a buffer greater than 0.625% of risk-weighted assets was required, which amount will increase each year until the buffer requirement is fully implemented on January 1, 2019. At September 30, 2018, the Company and MB Financial Bank maintained capital above the 1.875% conservation buffer required for 2018.

Non-GAAP Financial Information

This report contains certain financial information determined by methods other than in accordance with accounting principles generally accepted in the United States of America (GAAP). These measures include net interest income on a fully tax equivalent basis, net interest margin on a fully tax equivalent basis and net interest margin on a fully tax equivalent basis excluding the effect of the acquisition accounting discount accretion on loans acquired through the bank mergers. Our management uses these non-GAAP measures, together with the related GAAP measures, in its analysis of our performance and in making business decisions. Management also uses these measures for peer comparisons. The tax equivalent adjustment to net interest income recognizes the income tax savings when comparing taxable and tax-exempt assets and assumes a Federal tax rate of 21% for 2018 and 35% for 2017. Management believes that it is a standard practice in the banking industry to present net interest income and net interest margin on a fully tax equivalent basis, and accordingly believes that providing these measures may be useful for peer comparison purposes. Management also believes that presenting net interest margin on a tax equivalent basis excluding the effect of the acquisition accounting discount accretion on loans acquired through the Taylor Capital and American Chartered mergers is useful in assessing the impact of acquisition accounting on net interest margin, as the effect of loan discount accretion is expected to decrease as the acquired loans mature or roll off our balance sheet. These disclosures should not be viewed as substitutes for the results determined to be in accordance with GAAP, nor are they necessarily comparable to non-GAAP performance measures that may be presented by other companies. Reconciliations of net interest income on a fully tax equivalent basis to net interest income and net interest margin on a fully tax equivalent basis and net interest margin on a fully tax equivalent basis excluding the effect of the acquisition accounting discount accretion on loans acquired through the Taylor Capital and American Chartered mergers to net interest margin are contained in the tables under “Net Interest Margin.”

Forward-Looking Statements

When used in this Quarterly Report on Form 10-Q and in other documents filed or furnished with the Securities and Exchange Commission, in press releases or other public shareholder communications, or in oral statements made with the approval of an authorized executive officer, the words or phrases “believe,” “will,” “should,” “will likely result,” “are expected to,” “will continue,” “is anticipated,” “estimate,” “project,” “plans,” or similar expressions are intended to identify “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. You are cautioned not to place undue reliance on any forward-looking statements, which speak only as of the date made. These statements may relate to MB Financial, Inc.’s future financial performance, strategic plans or objectives, revenues or earnings projections, or other financial items. By their nature, these statements are subject to numerous uncertainties that could cause actual results to differ materially from those anticipated in the statements.

Important factors that could cause actual results to differ materially from the results anticipated or projected include, but are not limited to, the following: (1) the possibility that our actual results on selected items relating to our mortgage operations for which we have provided projections or estimates will be materially different from such projections or estimates; (2) the ability to satisfy closing conditions to our pending merger with Fifth Third on the expected terms and schedule; (3) the ability to obtain

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regulatory approvals required to complete our pending merger with Fifth Third, and the timing and conditions for such approvals; (4) delays in closing our pending merger with Fifth Third; (5) disruptions to our business resulting from our pending merger with Fifth Third; (6) the risk that funds obtained from capital raising activities will not be utilized efficiently or effectively; (7) expected revenues, cost savings, synergies, and other benefits from our other merger and acquisition activities might not be realized within the expected time frames or at all and costs or difficulties relating to integration matters, including but not limited to customer and employee retention, might be greater than expected; (8) the credit risks of lending activities, including changes in the level and direction of loan delinquencies and write-offs and changes in estimates of the adequacy of the allowance for loan and lease losses, which could necessitate additional provisions for loan losses, resulting both from originated loans and loans acquired from other financial institutions; (9) the quality and composition of our securities portfolio; (10) competitive pressures among depository institutions; (11) interest rate movements and their impact on customer behavior, net interest margin and the value of our mortgage servicing rights; (12) the possibility that our mortgage banking business may experience increased volatility in its revenues and earnings and the possibility that the profitability of our mortgage banking business could be significantly reduced, both before and after the discontinuation of our national mortgage origination business, if we are unable to originate and sell mortgage loans at profitable margins or if changes in interest rates negatively impact the value of our mortgage servicing rights; (13) the impact of repricing and competitors’ pricing initiatives on loan and deposit products; (14) fluctuations in real estate values; (15) results of examinations of us and our bank subsidiary by regulatory authorities and the possibility that any such regulatory authority may, among other things, limit our business activities, require us to change our business mix, increase our allowance for loan and lease losses, write-down asset values or increase our capital levels, or affect our ability to borrow funds or maintain or increase deposits, which could adversely affect our liquidity and earnings; (16) our ability to adapt successfully to technological changes to meet customers’ needs and developments in the market place; (17) the possibility that security measures implemented might not be sufficient to mitigate the risk of a cyber attack or cyber theft, and that such security measures might not protect against systems failures or interruptions; (18) our ability to realize the residual values of our direct finance, leveraged, and operating leases; (19) our ability to access cost-effective funding; (20) changes in financial markets; (21) changes in economic conditions in general and in the Chicago metropolitan area in particular; (22) the costs, effects, and outcomes of litigation; (23) new legislation or regulatory changes, changes in the interpretation and/or application of laws and regulations by regulatory authorities, other governmental initiatives affecting the financial services industry and changes in federal and/or state tax laws, including but not limited to the TCJ Act, or interpretations thereof by taxing authorities; (24) changes in accounting principles, policies or guidelines; and (25) future goodwill impairment due to changes in our business, changes in market conditions, or other factors.

We do not undertake any obligation to update any forward-looking statement to reflect circumstances or events that occur after the date on which the forward-looking statement is made.

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Item 3.   Quantitative and Qualitative Disclosures about Market Risk

Market Risk and Asset Liability Management

Market Risk.  Market risk is the risk that the market value or estimated fair value of our assets, liabilities, and derivative financial instruments will decline as a result of changes in interest rates or financial market volatility, or that our net income will be significantly reduced by interest rate changes.  Market risk is managed operationally in our Treasury Group and is addressed through a selection of funding and hedging instruments supporting balance sheet growth, as well as monitoring our asset investment strategies.

Asset Liability Management.  Management and our Treasury Group continually monitor our sensitivity to interest rate changes.  It is our policy to maintain an acceptable level of interest rate risk over a range of possible changes in interest rates while remaining responsive to market demand for loan and deposit products.  The strategy we employ to manage our interest rate risk is to measure our risk using an asset/liability simulation model.  The model considers several factors to determine our potential exposure to interest rate risk, including measurement of repricing gaps, duration, convexity, value at risk, and the market value of portfolio equity under assumed changes in the level of interest rates, shape of the yield curves, and general market volatility.  Management controls our interest rate exposure using several strategies, which include adjusting the maturities of securities in our investment portfolio, and limiting fixed rate loans or fixed rate deposits with terms of more than five years.  We also use derivative instruments, principally interest rate swaps, to manage our interest rate risk.  See Note 14 to the consolidated financial statements in Part I, Item 1 of this report.

Interest Rate Risk.  Interest rate risk can come in a variety of forms, including repricing risk, yield curve risk, basis risk, and prepayment risk.  We experience repricing risk when the change in the average yield of our interest earning assets or average rate of our interest bearing liabilities is more sensitive than the other to changes in market interest rates.  Such a change in sensitivity could reflect a number of possible mismatches in the repricing opportunities of our assets and liabilities.

In the event that yields on our assets and liabilities do adjust to changes in market rates to the same extent, we may still be exposed to yield curve risk.  Yield curve risk reflects the possibility the changes in the shape of the yield curve could have different effects on our assets and liabilities.

Variable rate assets and liabilities that reprice at similar times, or that have similar maturities or repricing dates, are based on different indexes that still have interest rate risk.  Basis risk reflects the possibility that indexes will not move in a coordinated manner.

We hold mortgage-related investments, including mortgage loans and mortgage-backed securities.  Prepayment risk is associated with mortgage-related investments and results from homeowners’ ability to pay off their mortgage loans prior to maturity.  We limit this risk by restricting the types of mortgage-backed securities we own to those with limited average life changes under certain interest-rate shock scenarios, or securities with embedded prepayment penalties.

Measuring Interest Rate Risk.  As noted above, interest rate risk can be measured by analyzing the extent to which the repricing of assets and liabilities are mismatched to create an interest sensitivity gap.  An asset or liability is said to be interest rate sensitive within a specific period if it will mature or reprice within that period.  The interest rate sensitivity gap is defined as the difference between the amount of interest earning assets maturing or repricing within a specific time period and the amount of interest bearing liabilities maturing or repricing within that same time period.  A gap is considered positive when the amount of interest rate sensitive assets exceeds the amount of interest rate sensitive liabilities.  A gap is considered negative when the amount of interest rate sensitive liabilities exceeds the amount of interest rate sensitive assets.  During a period of rising interest rates, therefore, a positive gap would tend to positively affect net interest income.  Conversely, during a period of falling interest rates, a positive gap position would tend to result in a decrease in net interest income.

The following table sets forth the amounts of interest earning assets and interest bearing liabilities outstanding at September 30, 2018 that we anticipate, based upon certain assumptions, to reprice or mature in each of the future time periods shown.  Except as stated below, the amount of assets and liabilities shown which reprice or mature during a particular period were determined based on the earlier of the term to repricing or the term to repayment of the asset or liability. 

The table is intended to provide an approximation of the projected repricing of assets and liabilities at September 30, 2018 based on contractual maturities and scheduled rate adjustments within a three-month period and subsequent selected time intervals.  The loan amounts in the table reflect principal balances expected to be reinvested and/or repriced because of contractual amortization and rate adjustments on adjustable-rate loans.  Loan and investment securities’ contractual maturities and amortization reflect expected prepayment assumptions.  While NOW, money market and savings deposit accounts have adjustable rates, it is assumed that the interest rates on some of the accounts will not adjust immediately to changes in other interest rates. Therefore,

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the information in the table is calculated assuming that NOW, money market and savings deposits will reprice as follows: 43%, 45%, and 25%, respectively, in the first three months, 4%, 7%, and 7%, respectively, in the next nine months, 18%, 25%, and 29%, respectively, from one year to five years, and 35%, 23%, and 39%, respectively over five years (dollars in thousands):

	Time to Maturity or Repricing
	0 – 90			91 - 365			1 – 5			Over 5
	Days			Days			Years			Years			Total
Interest Earning Assets:
Interest earning deposits with banks	$	74,970		$	10,450		$	2,320		$	—		$	87,740
Investment securities	89,607			291,723			1,296,306			1,074,390			2,752,026
Loans held for sale	51,834			—			—			—			51,834
Loans, including covered loans	8,291,309			1,399,283			3,429,615			814,745			13,934,952
Total interest earning assets	$	8,507,720		$	1,701,456		$	4,728,241		$	1,889,135		$	16,826,552
Interest Bearing Liabilities:
NOW, money market, and interest bearing deposits	$	2,277,957		$	286,228		$	1,098,029		$	1,463,116		$	5,125,330
Savings deposits	301,052			85,412			338,132			456,401			1,180,997
Time deposits	358,240			1,001,042			1,006,212			960			2,366,454
Short-term borrowings	903,355			—			—			—			903,355
Long-term borrowings	108,130			21,804			318,043			3,700			451,677
Junior subordinated notes issued to capital trusts	133,995			—			—			—			133,995
Total interest bearing liabilities	$	4,082,729		$	1,394,486		$	2,760,416		$	1,924,177		$	10,161,808
Rate sensitive assets (RSA)	$	8,507,720		$	10,209,176		$	14,937,417		$	16,826,552		$	16,826,552
Rate sensitive liabilities (RSL)	4,082,729			5,477,215			8,237,631			10,161,808			10,161,808
Cumulative GAP (GAP=RSA-RSL)	4,424,991			4,731,961			6,699,786			6,664,744			6,664,744
RSA/Total assets	43.14		%	51.77		%	75.75		%	85.33		%	85.33		%
RSL/Total assets	20.70			27.77			41.77			51.53			51.53
GAP/Total assets	22.44			24.00			33.97			33.80			33.80
GAP/RSA	52.01			46.35			44.85			39.61			39.61

Certain shortcomings are inherent in the method of analysis presented in the foregoing table.  For example, although certain assets and liabilities may have similar maturities or periods to repricing, they may react in different degrees to changes in market interest rates.  Also, the interest rates on certain types of assets and liabilities may fluctuate in advance of changes in market interest rates, while interest rates on other types of assets may lag behind changes in market rates.  Additionally, in the event of a change in interest rates, prepayment and early withdrawal levels would likely deviate significantly from those assumed in calculating the table.  Therefore, we do not rely on a gap analysis to manage our interest rate risk, but rather we use what we believe to be the more reliable simulation model relating to changes in net interest income.

Based on simulation modeling which assumes gradual changes in interest rates over a one-year period and no growth in balances of our interest earning assets and interest bearing liabilities at September 30, 2018 and December 31, 2017, we believe that our net interest income would change due to changes in interest rates as follows (dollars in thousands):  

Gradual	Changes in Net Interest Income Over One Year Horizon
Changes in	September 30, 2018					December 31, 2017
Levels of	Dollar			Percentage		Dollar			Percentage
Interest Rates	Change			Change		Change			Change
+ 2.00%	$	46,971		7.34	%	$	46,967		7.33	%
+ 1.00%	24,481			3.83		25,565			3.99
- 1.00%	(23,196		)	(3.63	)	(33,889		)	(5.29	)

In the interest rate sensitivity table above, changes in net interest income between September 30, 2018 and December 31, 2017 reflect changes in the composition of interest earning assets and interest bearing liabilities, related interest rates, repricing frequencies, and the fixed or variable characteristics of the interest earning assets and interest bearing liabilities.  The changes in net interest income incorporate the impact of loan floors as well as shifts from low cost deposits to higher cost certificates of deposit in a rising rate environment.

The assumptions used in our interest rate sensitivity simulation discussed above are inherently uncertain and, as a result, the simulations cannot precisely measure net interest income or precisely predict the impact of changes in interest rates on net interest income. Our model assumes that a portion of our variable rate loans that have minimum interest rates will remain in our portfolio regardless of changes in the interest rate environment. Actual results will differ from simulated results due to timing, magnitude, and frequency of interest rate changes as well as changes in market conditions and management strategies.

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Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures: An evaluation of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 (the “Act”)) was carried out as of September 30, 2018 under the supervision and with the participation of our Chief Executive Officer, Chief Financial Officer and several other members of our senior management.  Our Chief Executive Officer and Chief Financial Officer concluded that, as of September 30, 2018, our disclosure controls and procedures were effective in ensuring that the information we are required to disclose in the reports we file or submit under the Act is (i) accumulated and communicated to our management (including the Chief Executive Officer and Chief Financial Officer) to allow timely decisions regarding required disclosure, and (ii) recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.

Changes in Internal Control Over Financial Reporting: During the quarter ended September 30, 2018, no change occurred in our internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

We do not expect that our disclosure controls and procedures and internal control over financial reporting will prevent all error and all fraud.  A control procedure, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control procedure are met.  Because of the inherent limitations in all control procedures, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within the Company have been detected.  These inherent limitations include the realities that judgments in decision-making can be faulty and that breakdowns in controls or procedures can occur because of simple error or mistake.  Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the control.  The design of any control procedure also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions; over time, controls may become inadequate because of changes in conditions, or the degree of compliance with the policies or procedures may deteriorate.  Because of the inherent limitations in a cost-effective control procedure, misstatements due to error or fraud may occur and not be detected.

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PART II.        OTHER INFORMATION

Item 1.   Legal Proceedings

We are involved from time to time as plaintiff or defendant in various legal actions arising in the normal course of our businesses.  While the ultimate outcome of pending proceedings cannot be predicted with certainty, it is the opinion of management, after consultation with counsel representing us in such proceedings, that the resolution of these proceedings should not have a material adverse effect on our consolidated financial position or results of operation.

Item 1A.   Risk Factors

Except as set forth below, there have been no material changes to the risk factors disclosed in Item 1A. Risk Factors in our Annual Report on Form 10-K for the year ended December 31, 2017.

The discontinuation of our national residential mortgage origination business could adversely affect our results of operations.

On April 12, 2018, we announced the discontinuation of our national mortgage origination business, which includes substantially all originations outside of our consumer banking footprint in the Chicagoland area. As a result, we expect to incur one-time pre-tax costs of approximately $37 million to $41 million. It may take longer than we expect to complete the winding down of this business and we may incur costs that exceed our estimated costs. Although we expect the net impact of anticipated reductions in our quarterly net interest income from the Mortgage Banking Segment, mortgage origination revenue from the Mortgage Banking Segment, mortgage servicing revenue from the Mortgage Banking Segment and non-interest expense from the Mortgage Banking Segment to increase our quarterly pre-tax income from the first quarter of 2018 by approximately $7.4 million in 2019, no assurance can be given as to when or whether we will realize this benefit. In addition, we expect revenues from the Mortgage Banking Segment to decrease more quickly than expenses from the Mortgage Banking Segment, as we stopped accepting locked loans and loan applications from our national residential mortgage origination business during the second quarter of 2018.

Our merger agreement with Fifth Third may be terminated in accordance with its terms and the merger may not be completed.

Our merger agreement with Fifth Third is subject to a number of conditions which must be fulfilled in order to complete the merger. Those conditions include: receipt of requisite regulatory approvals, absence of orders prohibiting completion of any of the proposed transactions, the accuracy of the representations and warranties in the merger agreement by both parties (subject to the materiality standards set forth in the merger agreement) and the performance by both parties of their covenants and agreements under the merger agreement, and the receipt by both parties of legal opinions from their respective tax counsels. These conditions to the closing of the merger may not be fulfilled in a timely manner or at all, and, accordingly, the merger may not be completed. In addition, the parties can mutually decide to terminate the merger agreement at any time, before or after stockholder approval, and we or Fifth Third may elect to terminate the merger agreement in certain other circumstances.

Termination of the merger agreement could negatively impact us.

If the merger is not completed for any reason, our ongoing business may be adversely impacted and, without realizing any of the anticipated benefits of completing the merger, we would be subject to a number of risks, including the following:

• we may experience negative reactions from the financial markets, including negative impacts on our stock price (including to the extent that the current market price reflects a market assumption that the merger will be completed);

• we may experience negative reactions from our customers, vendors and employees;

• we will have incurred substantial expenses and will be required to pay certain costs relating to the merger, whether or not the merger is completed;

• the merger agreement places certain restrictions on the conduct of our businesses prior to completion of the merger. Such restrictions, the waiver of which is subject to the consent of Fifth Third (not to be unreasonably withheld, conditioned or delayed), may prevent us from making certain acquisitions or taking certain other specified actions during the pendency of the merger; and

• matters relating to the merger (including integration planning) will require substantial commitments of time and resources by our management, which would otherwise have been devoted to other opportunities that may have been beneficial to us as an independent company.

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If the merger agreement is terminated and our board of directors seeks another merger or business combination, our stockholders cannot be certain that we will be able to find a party willing to offer equivalent or more attractive consideration than the consideration Fifth Third has agreed to provide in the merger, or that such other merger or business combination will be completed. If the merger agreement is terminated under certain circumstances, we may be required to pay a termination fee of $151.2 million to Fifth Third.

We will be subject to business uncertainties and contractual restrictions while the merger is pending.

Uncertainty about the effect of the merger on employees and customers may have an adverse effect on us. These uncertainties may impair our ability to attract, retain and motivate key personnel until the merger is completed, and could cause customers and others that deal with us to seek to change existing business relationships with us. Retention of certain employees may be challenging during the pendency of the merger, as certain employees may experience uncertainty about their future roles. If key employees depart, our business could be negatively impacted. In addition, the merger agreement restricts us from making certain acquisitions and taking other specified actions without the consent of Fifth Third until the merger occurs. These restrictions may prevent us from pursuing attractive business opportunities that may arise prior to the completion of the merger.

The merger agreement contains provisions that may discourage other companies from trying to acquire us for greater merger consideration.

The merger agreement contains provisions that may discourage a third party from submitting a business combination proposal to us that might result in greater value to our stockholders than the merger or may result in a potential competing acquirer proposing to pay a lower per share price to acquire us than it might otherwise have proposed to pay absent such provisions. These provisions include a general prohibition on us soliciting, or, subject to certain exceptions relating to the exercise of fiduciary duties by our board of directors, entering into discussions with any third party regarding any acquisition proposal or offers for competing transactions. We also have an unqualified obligation to submit the proposal to approve the merger to a vote by our stockholders, even if we receive an alternative acquisition proposal that our board of directors believes is superior to the proposed merger with Fifth Third, unless the merger agreement has been terminated in accordance with its terms. In addition, we may be required to pay Fifth Third a termination fee of $151.2 million upon termination of the merger agreement in certain circumstances involving acquisition proposals for competing transactions.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

The following table sets forth information for the three months ended September 30, 2018 with respect to our repurchases of our outstanding common shares:

	Total Number of Shares Purchased (1)	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs (in Thousands)
April 1, 2018 — July 31, 2018	—	$	—	—	$	—
August 1, 2018 — August 31, 2018	5,072	48.48		—	—
September 1, 2018 — September 30, 2018	—	—		—	—
Total	5,072	$	48.48	—

⁽¹⁾  Includes shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock awards.

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Item 6.   Exhibits

82

Exhibit Number	Description
2.1	Agreement and Plan of Merger, dated as of July 14, 2013, by and among the Registrant and Taylor Capital Group, Inc. (incorporated herein by reference to Exhibit 2.1 to the Registrant's Current Report on Form 8-K filed on July 18, 2013 (File No.0-24566-01))
2.2	Amendment, dated as of June 30, 3014, to Agreement and Plan of Merger, dated as of July 14, 2013, by and between the Registrant and Taylor Capital Group, Inc. (incorporated herein by reference to Exhibit 2.1 to the Registrant's Current Report on Form 8-K filed on July 1, 2014 (File No.0-24566-01))
2.3	Letter Agreement, dated as of June 30, 3014, by and between the Registrant and Taylor Capital Group, Inc. (incorporated herein by reference to Exhibit 2.2 to the Registrant's Current Report on Form 8-K filed on July 1, 2014 (File No.0-24566-01))
2.4	Agreement and Plan of Merger, dated as of May 1, 2006, by and among the Registrant, MBFI Acquisition Corp. and First Oak Brook Bancshares, Inc. (“First Oak Brook”)(incorporated herein by reference to Exhibit 2.1 to the Registrant’s Current Report on Form 8-K filed on May 2, 2006 (File No.0-24566-01))
2.5	Purchase and Assumption Agreement among Federal Deposit Insurance Corporation, Receiver of Corus Bank, National Association, Chicago, Illinois, Federal Deposit Insurance Corporation and MB Financial Bank, N.A., dated as of September 11, 2009 (incorporated herein by reference to Exhibit 2.1 to the Registrant’s Current Report on Form 8-K filed on September 17, 2009 (File No.0-24566-01))
2.6	Purchase and Assumption Agreement among Federal Deposit Insurance Corporation, Receiver of Broadway Bank, Chicago, Illinois, Federal Deposit Insurance Corporation and MB Financial Bank, N.A., dated as of April 23, 2010 (incorporated herein by reference to Exhibit 2.6 to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2010 (File No. 0-24566-01))
2.7	Purchase and Assumption Agreement among Federal Deposit Insurance Corporation, Receiver of New Century Bank, Chicago, Illinois, Federal Deposit Insurance Corporation and MB Financial Bank, N.A., dated as of April 23, 2010 (incorporated herein by reference to Exhibit 2.7 to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2010 (File No. 0-24566-01))
2.8	Agreement and Plan of Merger, dated as of November 20, 2015, by and between the Registrant and American Chartered Bancorp, Inc. (incorporated herein by reference to Exhibit 2.1 to the Registrant's Current Report on Form 8-K filed on November 24, 2015 (File No.001-36599))
2.9	Agreement and Plan of Merger by and among Fifth Third Bancorp, Fifth Third Financial Corporation and MB Financial, Inc., dated as of May 20, 2018 (incorporated herein by reference to Exhibit 2.1 to the Registrant's Current Report on Form 8-K filed on May 23, 2018 (File No. 001-36599))
3.1	Charter of the Registrant, as amended (incorporated herein by reference to Exhibit 4.1 to the Post-Effective Amendment No. One on Form S-8 to the Registrant’s Form S-4 Registration Statement filed on August 26, 2016 (Registration No. 333-208966))
3.1A	Articles Supplementary to the Charter of the Registrant for the Registrant’s Perpetual Non-Cumulative Preferred Stock, Series A (incorporated herein by reference to Exhibit 3.3 to the Registrant’s Registration Statement on Form 8-A filed on August 14, 2014 (File No.001-36599))
3.1B	Articles Supplementary to the Charter of the Registrant for the Registrant’s Cumulative Voting Convertible Preferred Stock, Series B (incorporated herein by reference to Exhibit 3.2 to the Registrant’s Current Report on Form 8-K filed on August 30, 2016 (File No.001-36599))

83

Exhibit Number	Description
3.1C	Articles Supplementary to the Charter of the Registrant for the Registrant’s 6.00% Non-Cumulative Perpetual Preferred Stock, Series C (incorporated herein by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed on November 21, 2017 (File No.001-36599))
3.2	By-laws of the Registrant, as amended (incorporated herein by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed on March 2, 2015 (File No. 001-36599))
4.1	The Registrant hereby agrees to furnish to the Commission, upon request, the instruments defining the rights of the holders of each issue of long-term debt of the Registrant and its consolidated subsidiaries
4.2	Deposit Agreement, dated as of November 22, 2017, between the Registrant, Computershare Inc. and Computershare Trust Company, N.A., as depositary, and the holders from time to time of the depositary receipts described therein (incorporated herein by reference to Exhibit 4.2 to the Registrant’s Current Report on Form 8-K filed on November 22, 2017 (File No.001-36599))
10.1	Reserved
10.2	Amended and Restated Employment Agreement between the Registrant and Mitchell Feiger (incorporated herein by reference to Exhibit 10.2 to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 0-24566-01))
10.4	Form of Change and Control Severance Agreement between MB Financial Bank, National Association and Jill E. York (incorporated herein by reference to Exhibit 10.4 to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 0-24566-01))
10.4B	Form of Change and Control Severance Agreement between MB Financial Bank, National Association and each of Brian Wildman and Rosemarie Bouman (incorporated herein by reference to Exhibit 10.4B to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 0-24566-01))
10.4C	Form of Change in Control Severance Agreement between MB Financial Bank, National Association and Mark A. Heckler (incorporated herein by reference to Exhibit 10.4C to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2011 (File No. 0-24566-01))
10.4D	Form of Change in Control Severance Agreement between MB Financial Bank, National Association and Randall T. Conte (incorporated herein by reference to Exhibit 10.4D to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2014 (File No. 001-36599))
10.5	Reserved
10.5A	Reserved
10.5B	Reserved
10.7	MB Financial, Inc. Third Amended and Restated Omnibus Incentive Plan (the “Omnibus Incentive Plan”) (incorporated herein by reference to Appendix A to the Registrant’s definitive proxy statement filed on April 11, 2014 (File No. 0-24566-01))

84

Exhibit Number	Description
10.8	MB Financial Stock Deferred Compensation Plan (incorporated herein by reference to Exhibit 10.8 to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 0-24566-01))
10.9	MB Financial Non-Stock Deferred Compensation Plan (incorporated herein by reference to Exhibit 10.9 to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 0-24566-01))
10.10	Reserved
10.11	Agreement Regarding Salary Adjustment and Portion of Salary Payable by Stock, dated as of December 21, 2009, between MB Financial, Inc. and Mitchell Feiger (incorporated herein by reference to Exhibit 10.11 to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2009 (File No. 0-24566-01))
10.11A	Form of Agreement Regarding Salary Adjustment and Portion of Salary Payable by Stock between MB Financial, Inc. and Rosemarie Bouman, Mark A. Heckler and Brian J. Wildman (incorporated herein by reference to Exhibit 10.11A to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2011 (File No. 0-24566-01))
10.12	Agreement Regarding Salary Adjustment and Portion of Salary Payable by Stock, dated as of December 21, 2009, between MB Financial, Inc. and Jill E. York (incorporated herein by reference to Exhibit 10.12 to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2009 (File No. 0-24566-01))
10.13	Amended and Restated Employment Agreement between MB Financial Bank, N.A. and Ronald D. Santo (incorporated herein by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed on December 14, 2004 (File No. 0-24566-01))
10.13A	Amendment to Amended and Restated Employment Agreement between MB Financial Bank, N.A. and Ronald D. Santo ((incorporated herein by reference to Exhibit 10.13A to the Registrant’s Annual Report on Form 10-K/A for the year ended December 31, 2006, filed on March 2, 2007 (File No. 0-24566-01))
10.15	Tax Gross Up Agreements between the Registrant and each of Mitchell Feiger, Jill E. York and Brian Wildman (incorporated herein by reference to Exhibit 10.15 to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 0-24566-01))
10.15A	Tax Gross Up Agreement between the Registrant and Rosemarie Bouman (incorporated herein by reference to Exhibit 10.15A to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 0-24566-01))
10.16	Form of Incentive Stock Option Agreement for Executive Officers under the Omnibus Incentive Plan (incorporated herein by reference to Exhibit 10.16 to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2007 (File No. 0-24566-01))
10.17	Form of Non-Qualified Stock Option Agreement for Directors under the Omnibus Incentive Plan (incorporated herein by reference to Exhibit 10.17 to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2007 (File No. 0-24566-01))

85

Exhibit Number	Description
10.18	Form of Restricted Stock Agreement for Executive Officers under the Omnibus Incentive Plan (incorporated herein by reference to Exhibit 10.18 to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2007 (File No. 0-24566-01))
10.18A	Amendment to Form of Incentive Stock Option Agreement and Form of Restricted Stock Agreement for Executive Officers under the Omnibus Incentive Plan (incorporated herein by reference to Exhibit 10.18A to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 0-24566-01))
10.18B	Form of Performance-Based Restricted Stock Agreement for Executive Officers under the Omnibus Incentive Plan (incorporated herein by reference to Exhibit 10.18B to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2009 (File No. 0-24566-01))
10.18C	Form of Restricted Stock Agreement for grants on December 2, 2009 to Mitchell Feiger and Jill E. York (incorporated herein by reference to Exhibit 10.18C to the Registrant’s Current Report on Form 8-K filed on December 7, 2009 (File No. 0-24566-01))
10.19	Form of Restricted Stock Agreement for Directors under the Omnibus Incentive Plan (incorporated herein by reference to Exhibit 10.19 to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2007 (File No. 0-24566-01))
10.20	First Oak Brook Bancshares, Inc. Incentive Compensation Plan (incorporated herein by reference to Appendix A to the definitive proxy statement filed by First Oak Brook on March 30, 2004 (File No. 0-14468))
10.20A	Amendment to First Oak Brook Bancshares, Inc. Incentive Compensation Plan ((incorporated herein by reference to Exhibit 10.20A to the Registrant’s Annual Report on Form 10-K/A for the year ended December 31, 2006, filed on March 2, 2007 (File No. 0-24566-01))
10.21	First Oak Brook Bancshares, Inc. 2001 Stock Incentive Plan (incorporated herein by reference to Appendix A to the definitive proxy statement filed by First Oak Brook on April 2, 2001 (File No. 0-14468))
10.21A	Amendment to First Oak Brook Bancshares, Inc. 2001 Stock Incentive Plan ((incorporated herein by reference to Exhibit 10.21A to the Registrant’s Annual Report on Form 10-K/A for the year ended December 31, 2006, filed on March 2, 2007 (File No. 0-24566-01))
10.22	First Oak Brook Bancshares, Inc. Directors Stock Plan (incorporated herein by reference to Exhibit 4.1 to the Registration Statement on Form S-8 filed by First Oak Brook on October 25, 1999 (File No. 333-89647))
10.22A	Amendment to First Oak Brook Bancshares, Inc. Directors Stock Plan (incorporated herein by reference to Exhibit 10.22A to the Registrant’s Quarterly Report on Form 10-Q/A for the quarter ended March 31, 2007 filed on May 15, 2007 (File No. 0-24566-01))
10.23	Letter Agreement, dated as of June 30, 2014, by and among the Registrant and certain principal stockholders of Taylor Capital Group, Inc. (incorporated herein by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed on July 1, 2014 (File No.0-24566-01))
10.23A	Supplemental Agreement, dated as of August 15, 2014, by and among the Registrant, MB Financial Bank, N.A., and Jennifer W. Steans, as representative of certain principal stockholders of Taylor Capital Group, Inc. (incorporated herein by reference to Exhibit 10.2 to the Registrant's Current Report on Form 8-K filed on August 20, 2014 (File No.001-36599))

86

Exhibit Number	Description
10.23B	Escrow Agreement, dated as of August 15, 2014, by and among MB Financial Bank, N.A., Jennifer W. Steans, as representative of certain principal stockholders of Taylor Capital Group, Inc., and The Northern Trust Company, as escrow agent (incorporated herein by reference to Exhibit 10.3 to the Registrant's Current Report on Form 8-K filed on August 20, 2014 (File No.001-36599))
10.23C	Second Amendment to Letter Agreement Re: Escrow of Merger Consideration, dated as of December 16, 2016, by and among the Registrant, MB Financial Bank, N.A., and Jennifer W. Steans, as representative of certain principal stockholders of Taylor Capital Group, Inc. (incorporated herein by reference to Exhibit 10.23C to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2016 (File No. 001-36599))
10.24	Reserved
10.24A	Amended and Restated Employment Agreement by and between the Registrant, MB Financial Bank, N.A. and Mark A. Hoppe (incorporated herein by reference to Exhibit 10.24A to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2017 (File No. 001-36599))
10.25	Taylor Capital Group, Inc. Deferred Compensation Plan (incorporated herein by reference to Exhibit 10.1 to the Annual Report on Form 10-K of Taylor Capital Group, Inc. for the year ended December 31, 2008 (File No. 000-50034))
10.25A	Trust Under Taylor Capital Group, Inc. Deferred Compensation Plan (incorporated herein by reference to Exhibit 10.17 of the Registration Statement on Form S-1 of Taylor Capital Group, Inc. filed May 24, 2002 (Registration No. 333-89158))
10.25B	Amendment to the Taylor Capital Group, Inc. Deferred Compensation Plan (incorporated herein by reference to Exhibit 10.25B to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2014 (File No. 001-36599))
10.26	Taylor Capital Group, Inc. Senior Officer Change in Control Severance Plan (incorporated herein by reference to Exhibit 10.1 of the Quarterly Report on Form 10-Q of Taylor Capital Group, Inc. for the quarterly period ended June 30, 2009 (File No. 000-50034))
10.26A	Amendment to the Taylor Capital Group, Inc. Senior Officer Change in Control Severance Plan (incorporated herein by reference to Exhibit 10.26A to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2014 (File No. 001-36599))
10.27	First Oak Brook Bancshares, Inc. Executive Deferred Compensation Plan (incorporated by reference to Exhibit 10.3 to First Oak Brook’s Annual Report on Form 10-K for the year ended December 31, 1997 (File No. 0-14468))
10.27A	Amendment to First Oak Brook Bancshares, Inc. Executive Deferred Compensation Plan (incorporated herein by reference to Exhibit 10.27A to the Registrant’s Quarterly Report on Form 10-Q/A for the quarter ended March 31, 2007 filed on May 15, 2007 (File No. 0-24566-01))
10.29	Form of Transitional Employment Agreement between the Registrant (as successor to First Oak Brook) and Rosemarie Bouman (incorporated herein by reference to Exhibit 10.10 to First Oak Brook’s Annual Report on Form 10-K for the year ended December 31, 1998 (File No. 0-14468))
10.29A	First Amendment to Transitional Employment Agreement between the Registrant (as successor to First Oak Brook) and Rosemarie Bouman ((incorporated herein by reference to Exhibit 10.28A to the Registrant’s Annual Report on Form 10-K/A for the year ended December 31, 2006, filed March 2, 2007 (File No. 0-24566-01))

87

Exhibit Number	Description
10.29B	Second Amendment to Transitional Employment Agreement between the Registrant (as successor to First Oak Brook) and Rosemarie Bouman ((incorporated herein by reference to Exhibit 10.28B to the Registrant’s Annual Report on Form 10-K/A for the year ended December 31, 2006, filed March 2, 2007 (File No. 0-24566-01))
10.30	Form of Performance Share Unit Award Agreement (incorporated herein by reference to Exhibit 10.30 to the Registrant's Current Report on Form 8-K filed on September 5, 2012 (File No. 0-24566-01))
10.31	Form of Incentive Stock Option Agreement (Management Committee) (incorporated herein by reference to Exhibit 10.31 to the Registrant's Current Report on Form 8-K filed on September 5, 2012 (File No. 0-24566-01))
10.32	Form of Restricted Stock Agreement (Management Committee) (incorporated herein by reference to Exhibit 10.32 to the Registrant's Current Report on Form 8-K filed on September 5, 2012 (File No. 0-24566-01))
10.32A	Form of Restricted Stock Unit Agreement (Management Committee) (incorporated herein by reference to Exhibit 10.32A to the Registrant's Current Report on Form 8-K filed on September 5, 2012 (File No. 0-24566-01))
31.1	Rule 13a — 14(a)/15d — 14(a) Certification (Chief Executive Officer)*
31.2	Rule 13a — 14(a)/15d — 14(a) Certification (Chief Financial Officer)*
32	Section 1350 Certifications*
101	The following financial statements from the MB Financial, Inc. Quarterly Report on Form 10-Q for the quarter ended September 30, 2018, formatted in Extensive Business Reporting Language (XBRL): (i) consolidated balance sheets, (ii) consolidated statements of operations, (iii) consolidated statements of comprehensive income, (iv) consolidated statements of cash flows and (v) the notes to consolidated financial statements*

*  Filed herewith

88

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

MB FINANCIAL, INC.

(registrant)

Date:	November 9, 2018	By:	/s/Mitchell Feiger
			Mitchell Feiger
			President and Chief Executive Officer
			(Principal Executive Officer)
Date:	November 9, 2018	By:	/s/Randall T. Conte
			Randall T. Conte
			Vice President and Chief Financial Officer
			(Principal Financial Officer)

89

EX-31.1

EXHIBIT 31.1

CERTIFICATION 

I, Mitchell Feiger, certify that: 

1.           I have reviewed this Quarterly Report on Form 10-Q of MB Financial, Inc.; 

2.          Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.           Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;  

4.           The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:  

a)           Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;  

b)           Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles; 

c)           Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and 

d)           Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and  

5.           The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of registrant's board of directors (or persons performing the equivalent functions): 

a)           All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and  

b)           Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.  

Date:  November 9, 2018

/s/ Mitchell Feiger

Mitchell Feiger

President and Chief Executive Officer 

EX-31.2

EXHIBIT 31.2

CERTIFICATION

I, Randall T. Conte, certify that: 

 1.           I have reviewed this Quarterly Report on Form 10-Q of MB Financial, Inc.; 

 2.           Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.           Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report; 

4.           The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have: 

a)           Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared; 

 b)           Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)           Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

 d)           Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and  

5.           The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of registrant's board of directors (or persons performing the equivalent functions):

  a)           All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and 

 b)           Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.  

 Date:  November 9, 2018

/s/ Randall T. Conte

Randall T. Conte

Vice President and Chief Financial Officer 

EX-32

EXHIBIT 32

CERTIFICATION

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, each of the undersigned hereby certifies in his or her capacity as an officer of MB Financial, Inc. (the Company) that the Quarterly Report of the Company on Form 10-Q for the quarter ended September 30, 2018 fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934 and that the information contained in such report fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods presented in the financial statements included in such report.

Date:	November 9, 2018	/s/Mitchell Feiger
		Mitchell Feiger
		President and Chief Executive Officer
Date:	November 9, 2018	/s/Randall T. Conte
		Randall T. Conte
		Vice President and Chief Financial Officer

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 09, 2018
Document and Entity Information
Entity Registrant Name	MB FINANCIAL INC /MD
Entity Central Index Key	0001139812
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock shares outstanding (in shares)		84,236,864
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Emerging Growth Company	false
Entity Small Business	false

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 342,933	$ 397,880
Interest earning deposits with banks	87,740	181,341
Total cash and cash equivalents	430,673	579,221
Investment securities:
Securities available for sale, at fair value	1,710,636
Securities available for sale, at fair value		1,408,326
Securities held to maturity, at amortized cost ($932,756 fair value at September 30, 2018 and $992,455 at December 31, 2017)	923,082	959,082
Marketable equity securities	10,901	0
Non-marketable securities - FHLB and FRB stock	107,407	114,111
Total investment securities	2,752,026	2,481,519
Loans held for sale	51,834	548,578
Loans:
Total loans, excluding purchased credit-impaired loans	13,843,880	13,846,318
Purchased credit-impaired loans	91,072	119,744
Total loans	13,934,952	13,966,062
Less: Allowance for loan and lease losses	155,411	157,710
Net loans	13,779,541	13,808,352
Lease investments, net	429,843	409,051
Premises and equipment, net	274,006	286,690
Cash surrender value of life insurance	207,280	203,602
Goodwill	999,925	1,003,548
Net book value	49,114	54,766
Mortgage servicing rights, at fair value	295,803	276,279
Other real estate owned, net	10,933	9,736
Other real estate owned related to FDIC-assisted transactions	2,661	4,788
Other assets	436,332	420,810
Total assets	19,719,971	20,086,940
Deposits:
Non-interest bearing	6,036,012	6,381,512
Interest bearing	8,672,781	8,576,866
Total deposits	14,708,793	14,958,378
Short-term borrowings	903,355	861,039
Long-term borrowings	451,677	505,158
Junior subordinated notes issued to capital trusts	133,995	211,494
Accrued expenses and other liabilities	556,822	541,048
Total liabilities	16,754,642	17,077,117
STOCKHOLDERS’ EQUITY
Preferred stock, ($0.01 par value, authorized 10,000,000 shares at September 30, 2018 and December 31, 2017; Series A, 8% perpetual non-cumulative, none issued and outstanding at September 30, 2018 and 4,000,000 shares issued and outstanding at December 31, 2017, $25 liquidation value; Series C, 6% perpetual non-cumulative, 200,000 shares issued and outstanding at September 30, 2018 and December 31, 2017, $1,000 liquidation value)	194,719	309,999
Common stock, ($0.01 par value; authorized 120,000,000 shares at September 30, 2018 and December 31, 2017; issued 86,160,783 shares at September 30, 2018 and 85,801,702 shares at December 31, 2017)	862	858
Additional paid-in capital	1,703,404	1,691,007
Retained earnings	1,147,060	1,065,303
Accumulated other comprehensive (loss) income	(17,186)	3,584
Less: 1,940,112 and 1,883,810 shares of treasury common stock, at cost, at September 30, 2018 and December 31, 2017, respectively	(63,530)	(60,928)
Total stockholders’ equity	2,965,329	3,009,823
Total liabilities and stockholders’ equity	$ 19,719,971	$ 20,086,940

XML

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Securities held to maturity, at amortized cost, fair value	$ 932,756	$ 992,455
Preferred stock, par or stated value per share (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	120,000,000	120,000,000
Common stock, issued shares (in shares)	86,160,783	85,801,702
Treasury stock, shares (in shares)	1,940,112	1,883,810
Series A Preferred Stock
Preferred stock, dividend rate (percent)	8.00%	8.00%
Preferred stock, shares issued (in shares)	0	4,000,000
Preferred stock, shares outstanding (in shares)	0	4,000,000
Preferred stock, liquidation preference per share (in dollars per share)	$ 25	$ 25
Series C Preferred Stock
Preferred stock, dividend rate (percent)	6.00%	6.00%
Preferred stock, shares issued (in shares)	200,000	200,000
Preferred stock, shares outstanding (in shares)	200,000	200,000
Preferred stock, liquidation preference per share (in dollars per share)	$ 1,000	$ 1,000

XML

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Loans:
Taxable	$ 168,190,000	$ 155,440,000	$ 489,710,000	$ 432,603,000
Nontaxable	2,146,000	2,632,000	6,747,000	8,303,000
Investment securities:
Taxable	10,366,000	8,440,000	28,878,000	26,279,000
Nontaxable	9,387,000	9,731,000	28,302,000	29,541,000
Other interest earning accounts and Federal funds sold	1,650,000	327,000	2,025,000	754,000
Total interest income	191,739,000	176,570,000	555,662,000	497,480,000
Interest expense:
Deposits	20,485,000	10,865,000	52,903,000	27,133,000
Short-term borrowings	2,317,000	5,148,000	7,602,000	11,440,000
Long-term borrowings and junior subordinated notes	7,089,000	3,610,000	20,859,000	9,923,000
Total interest expense	29,891,000	19,623,000	81,364,000	48,496,000
Net interest income	161,848,000	156,947,000	474,298,000	448,984,000
Provision for credit losses	21,503,000	4,517,000	35,230,000	17,950,000
Net interest income after provision for credit losses	140,345,000	152,430,000	439,068,000	431,034,000
Non-interest income:
Mortgage banking revenue	9,916,000	28,242,000	53,889,000	86,850,000
Lease financing revenue, net	25,205,000	23,148,000	72,833,000	62,967,000
Treasury management fees	15,226,000	14,508,000	45,448,000	43,696,000
Wealth management fees	9,089,000	8,702,000	27,179,000	25,720,000
Card fees	5,362,000	4,585,000	15,803,000	13,564,000
Capital markets and international banking fees	1,913,000	4,870,000	8,696,000	11,709,000
Consumer and other deposit service fees	3,051,000	3,424,000	8,892,000	10,072,000
Brokerage fees	1,138,000	1,004,000	3,052,000	3,379,000
Loan service fees	2,103,000	2,114,000	6,496,000	6,120,000
Increase in cash surrender value of life insurance	1,298,000	1,321,000	3,678,000	3,910,000
Net (loss) gain on investment securities	(85,000)	83,000	(345,000)	451,000
Net loss on disposal of other assets	(32,000)	(180,000)	(786,000)	(307,000)
Other operating income	5,657,000	4,110,000	16,114,000	11,420,000
Total non-interest income	79,841,000	95,931,000	260,949,000	279,551,000
Non-interest expenses:
Salaries and employee benefits expense	101,885,000	105,815,000	331,877,000	309,932,000
Occupancy and equipment expense	16,117,000	15,382,000	49,997,000	45,710,000
Computer services and telecommunication expense	12,684,000	10,062,000	34,711,000	29,287,000
Advertising and marketing expense	3,432,000	2,558,000	10,637,000	8,964,000
Professional and legal expense	2,586,000	2,109,000	13,371,000	7,250,000
Other intangibles amortization expense	1,854,000	2,038,000	5,652,000	6,214,000
Branch exit and facilities impairment charges	3,292,000	2,773,000	3,632,000	8,680,000
Net loss (gain) recognized on other real estate owned and other related expense	248,000	(86,000)	1,343,000	1,448,000
Loss on extinguishment of debt	6,255,000	0	9,391,000	0
Goodwill impairment loss	0	0	3,623,000	0
Other operating expenses	20,191,000	22,310,000	65,188,000	68,030,000
Total non-interest expenses	168,544,000	162,961,000	529,422,000	485,515,000
Income before income taxes	51,642,000	85,400,000	170,595,000	225,070,000
Income tax expense	8,928,000	24,557,000	32,591,000	65,224,000
Net income	42,714,000	60,843,000	138,004,000	159,846,000
Dividends on preferred shares	3,000,000	2,002,000	9,100,000	6,007,000
Return from preferred stockholders due to redemption	0	0	(15,280,000)	0
Net income available to common stockholders	$ 39,714,000	$ 58,841,000	$ 144,184,000	$ 153,839,000
Common share data:
Basic earnings per common share (in dollars per share)	$ 0.47	$ 0.70	$ 1.71	$ 1.84
Diluted earnings per common share (in dollars per share)	$ 0.47	$ 0.69	$ 1.69	$ 1.81
Weighted average common shares outstanding for basic earnings per common share (in shares)	84,369,519	83,891,175	84,230,835	83,799,694
Diluted weighted average common shares outstanding for diluted earnings per common share (in shares)	85,335,109	84,779,797	85,162,220	84,775,952

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 42,714	$ 60,843	$ 138,004	$ 159,846
Unrealized holding (gains) losses on investment securities, net of reclassification adjustments	(10,296)	(890)	(30,356)	9,143
Reclassification adjustment for amortization of unrealized losses (gains) on investment securities transferred to held to maturity from available for sale	152	(266)	418	(1,089)
Reclassification adjustments for losses (gains) included in net income	85	(83)	345	(451)
Other comprehensive (loss) income, before tax	(10,059)	(1,239)	(29,593)	7,603
Income tax expense (benefit) related to items of other comprehensive (loss) income	2,691	491	7,916	(3,021)
Other comprehensive (loss) income, net of tax	(7,368)	(748)	(21,677)	4,582
Comprehensive income	$ 35,346	$ 60,095	$ 116,327	$ 164,428

XML

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss), Net of Tax	Treasury Stock	Non-controlling Interest
Beginning balance at Dec. 31, 2016	$ 2,579,209	$ 115,572	$ 856	$ 1,678,826	$ 838,892	$ 5,190	$ (60,384)	$ 257
Increase (Decrease) in Stockholders' Equity
Net income	159,846				159,846
Other comprehensive income (loss), net of tax	4,582					4,582
Conversion of preferred stock to common stock		(292)		292
Cash dividends declared on preferred shares	(6,007)				(6,007)
Cash dividends declared on common shares	(51,783)				(51,783)
Restricted common stock activity, net of tax	(3,280)			(6,829)			3,549
Stock option activity, net of tax	332		2	330
Repurchase of common shares in connection with employee benefit plans and held in trust for deferred compensation plan	(3,297)			605			(3,902)
Stock-based compensation expense	13,317			13,317
Purchase of additional investment in subsidiary from minority owners	(827)			(570)				(257)
Ending balance at Sep. 30, 2017	2,692,092	115,280	858	1,685,971	940,948	9,772	(60,737)	0
Increase (Decrease) in Stockholders' Equity
Cumulative effect of accounting changes	(297)				(1,204)	907
Beginning balance at Dec. 31, 2017	3,009,823	309,999	858	1,691,007	1,065,303	3,584	(60,928)
Increase (Decrease) in Stockholders' Equity
Net income	138,004				138,004
Other comprehensive income (loss), net of tax	(21,677)					(21,677)
Redemption of preferred stock	(100,000)	(115,280)			15,280
Cash dividends declared on preferred shares	(9,100)				(9,100)
Cash dividends declared on common shares	(61,223)				(61,223)
Restricted common stock activity, net of tax	(3,176)		2	(3,178)
Stock option activity, net of tax	858		2	856
Repurchase of common shares in connection with employee benefit plans and held in trust for deferred compensation plan	(1,571)			1,031			(2,602)
Stock-based compensation expense	13,688			13,688
Ending balance at Sep. 30, 2018	$ 2,965,329	$ 194,719	$ 862	$ 1,703,404	$ 1,147,060	$ (17,186)	$ (63,530)	$ 0

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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.72	$ 0.61

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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows From Operating Activities
Net income	$ 138,004,000	$ 159,846,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment and leased equipment	84,762,000	69,859,000
Branch exit and facilities impairment charges	3,632,000	8,680,000
Compensation expense for share-based payment plans	13,688,000	13,317,000
Net loss (gain) on sales of premises and equipment and leased equipment	633,000	(794,000)
Amortization of other intangibles	5,652,000	6,214,000
Provision for credit losses	35,230,000	17,950,000
Deferred income tax expense	32,190,000	37,574,000
Amortization of premiums and discounts on investment securities, net	24,998,000	30,124,000
Accretion of discounts on loans, net	(13,789,000)	(21,760,000)
Net loss (gain) on investment securities	345,000	(451,000)
Proceeds from sale of loans held for sale	2,442,638,000	3,665,709,000
Origination of loans held for sale	(2,051,710,000)	(3,629,230,000)
Net loss (gain) on sale of loans held for sale	11,087,000	(10,073,000)
Origination of mortgage servicing rights	(30,086,000)	(43,197,000)
Change in fair value of mortgage servicing rights	10,723,000	20,601,000
Net loss on other real estate owned	798,000	1,397,000
Increase in cash surrender value of life insurance	(3,678,000)	(3,910,000)
Loss on extinguishment of debt	9,391,000	0
Goodwill impairment loss	3,623,000	0
(Decrease) increase in other assets, net	(8,401,000)	18,075,000
Decrease in other liabilities, net	(16,074,000)	(49,043,000)
Net cash provided by operating activities	693,656,000	290,888,000
Cash Flows From Investing Activities
Proceeds from sales of investment securities available for sale	2,610,000	2,271,000
Proceeds from maturities and calls of investment securities available for sale	312,450,000	249,264,000
Purchases of investment securities available for sale	(668,673,000)	(66,402,000)
Proceeds from maturities and calls of investment securities held to maturity	82,245,000	105,065,000
Purchases of investment securities held to maturity	(56,271,000)	(36,877,000)
Purchase of marketable equity securities	(376,000)	0
Proceeds from sales of marketable equity securities	178,000	0
Purchases of non-marketable securities - FHLB and FRB stock	(44,505,000)	(135,479,000)
Redemption of non-marketable securities - FHLB and FRB stock	51,208,000	126,410,000
Net decrease (increase) in loans	85,407,000	(1,100,271,000)
Purchases of mortgage servicing rights	(161,000)	(839,000)
Purchases of premises and equipment and leased equipment	(99,225,000)	(130,313,000)
Proceeds from sales of premises and equipment and leased equipment	5,780,000	20,860,000
Proceeds from sale of other real estate owned	3,727,000	18,432,000
Proceeds from sale of other real estate owned related to FDIC-assisted transactions	1,469,000	3,141,000
Purchase of additional investment in subsidiary from minority owners	0	(827,000)
Net proceeds from FDIC related covered assets	818,000	(583,000)
Net cash used in investing activities	(323,319,000)	(946,148,000)
Cash Flows From Financing Activities
Net (decrease) increase in deposits	(249,585,000)	304,696,000
Proceeds from short-term borrowings - FHLB advances	340,000,000	3,125,000,000
Principal paid on short-term borrowings - FHLB advances	(725,000,000)	(3,150,000,000)
Net increase in other short-term borrowings	167,316,000	171,127,000
Proceeds from long-term borrowings	465,130,000	348,235,000
Principal paid on long-term borrowings	(258,611,000)	(104,310,000)
Redemption of junior subordinated notes issued to capital trusts	(87,631,000)	0
Redemption of preferred stock	(100,000,000)	0
Treasury stock transactions, net	(1,571,000)	(3,238,000)
Stock options exercised	3,399,000	1,715,000
Dividends paid on preferred stock	(11,100,000)	(6,007,000)
Dividends paid on common stock	(61,232,000)	(51,711,000)
Net cash (used in) provided by financing activities	(518,885,000)	635,507,000
Net decrease in cash and cash equivalents	(148,548,000)	(19,753,000)
Cash and cash equivalents:
Beginning of period	579,221,000	463,469,000
End of period	430,673,000	443,716,000
Cash payments for:
Interest paid to depositors and on other borrowed funds	81,364,000	47,104,000
Income tax payments (refunds), net	3,511,000	(4,762,000)
Supplemental Schedule of Noncash Investing Activities:
Investment securities held to maturity purchased not settled	1,699,000	2,433,000
Loans transferred to other real estate owned	4,974,000	6,467,000
Loans transferred to other real estate owned related to FDIC-assisted transactions	0	2,721,000
Loans transferred to repossessed assets	1,878,000	1,410,000
Operating leases rewritten as direct finance leases included as loans	2,359,000	1,484,000
Long-term borrowings transferred to short-term borrowings	260,000,000	150,000,000
Adjustments to noncash assets previously acquired:
Loans	0	1,846,000
Goodwill	0	(1,113,000)
Other assets	0	(733,000)
Total adjustments to noncash assets previously acquired	$ 0	$ 0

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Basis of Presentation

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

These unaudited consolidated financial statements include the accounts of MB Financial, Inc., a Maryland corporation (the “Company”), and its subsidiaries, including its wholly owned national bank subsidiary, MB Financial Bank, N.A. (“MB Financial Bank”), based in Chicago, Illinois. In the opinion of management, all normal recurring adjustments necessary for a fair presentation of the financial condition, results of operations and cash flows for the interim periods have been made. The results of operations for the nine months endedSeptember 30, 2018 are not necessarily indicative of the results to be expected for the entire fiscal year.

These unaudited interim financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and industry practice. Certain information in footnote disclosure normally included in financial statements prepared in accordance with U.S. GAAP and industry practice has been condensed or omitted pursuant to rules and regulations of the Securities and Exchange Commission. These financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017.

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions which affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements, as well as the reported amounts of income and expenses during the reported periods. Actual results could differ from those estimates.

Certain prior period amounts have been reclassified to conform to current period presentation. These reclassifications did not result in any changes to previously reported net income or stockholders’ equity.

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New Authoritative Accounting Guidance

9 Months Ended

Sep. 30, 2018

Accounting Changes and Error Corrections [Abstract]

New Authoritative Accounting Guidance

New Authoritative Accounting Guidance

ASC Topic 805 "Business Combinations." New authoritative accounting guidance under ASC Topic 805 "Business Combinations" amends prior guidance to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 606 "Revenue from Contracts with Customers." New authoritative accounting guidance under ASC Topic 606, "Revenue from Contracts with Customers" amended prior guidance to require an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The new authoritative guidance was initially effective for reporting periods after January 1, 2017 but was deferred to January 1, 2018. The Company's revenue is comprised of interest income on financial assets, which is excluded from the scope of this new guidance, and non-interest income. This new guidance changes how certain recurring revenue streams are recognized within lease financing revenue and insignificant components of non-interest income. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition. See "Accounting changes" below.

ASC Topic 825 "Financial Instruments." New authoritative accounting guidance under ASC Topic 825 "Financial Instruments" amended prior guidance to require equity investments (except those accounted for under the equity method of accounting) to be measured at fair value with changes in fair value recognized in net income. An entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer. The new guidance simplifies the impairment assessment of equity investments without readily determinable fair values, requires public entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from changes in the instrument-specific credit risk when the entity has selected the fair value option for financial instruments and requires separate presentation of financial assets and liabilities by measurement category and form of financial asset. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition. See "Accounting changes" below.

ASC Topic 405 "Liabilities-Extinguishment of Liabilities." New authoritative accounting guidance under ASC Topic 405, "Liabilities-Extinguishment of Liabilities" amended prior guidance to clarify that liabilities related to the sale of prepaid store-value products within the scope of this guidance are financial liabilities and that breakage for those liabilities are to be accounted for consistent with the breakage guidance in ASC Topic 606 "Revenue from Contracts with Customers." The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 842 "Leases." New authoritative accounting guidance under ASC Topic 842 "Leases" amended prior guidance to require lessees to recognize the assets and liabilities arising from all leases on the balance sheet. The new authoritative guidance defines a lease as a contract, or part of a contract, that conveys the right to control the use of identified property, plant, or equipment (an identified asset) for a period of time in exchange for consideration. In addition, the qualifications for a sale and leaseback transaction have been amended. The new authoritative guidance also requires qualitative and quantitative disclosures bylessees and lessors to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The new authoritative guidance will be effective for reporting periods after January 1, 2019. In July 2018, the Financial Accounting Standards Board issued new authoritative guidance to provide an additional transition method that allows entities to not apply this new guidance in the comparative periods presented in the financial statements and instead recognize a cumulative effect adjustment to the beginning retained earnings at the date of application. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition. The Company expects an increase in assets and liabilities as a result of recording additional lease contracts where the Company is lessee and expects to adopt the new guidance prospectively as of January 1, 2019 and to not restate comparative periods.

ASC Topic 815 "Derivatives and Hedging." New authoritative accounting guidance under ASC Topic 815 "Derivatives and Hedging" amended prior guidance to better align an entity's risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. The new authoritative guidance expands and refines hedge accounting for both nonfinancial and financial risk components. The new authoritative guidance will be effective for reporting periods after January 1, 2019 with early adoption permitted. In October 2018, the Financial Accounting Standards Board issued new authoritative guidance to permit the use of the Overnight Index Swap rate based on Secured Overnight Financing Rate as a U.S. benchmark interest rate for hedge accounting purposes. This new authoritative guidance is not expected to have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 718 "Compensation - Stock Compensation." New authoritative accounting guidance under ASC Topic 718 "Compensation - Stock Compensation" amends prior guidance by clarifying which changes to terms or conditions of a share-based payment award require an entity to apply modification accounting. An entity should account for the effects of a modification unless the fair value, vesting conditions and classification of the modified award are the same as the original award. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 326 "Financial Instruments - Credit Losses." New authoritative accounting guidance under ASC Topic 326 "Financial Instruments - Credit Losses" amended the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information for credit loss estimates. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The new authoritative guidance also requires a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected (net of the allowance for credit losses). In addition, the credit losses relating to available-for-sale debt securities should be recorded through an allowance for credit losses rather than a write-down. The new authoritative guidance will be effective for reporting periods after January 1, 2020. The Company is evaluating the new guidance and expects it to have an impact on the Company's statements of operations and financial condition, the significance of which is not yet known nor can it be reasonably estimated currently. Due to the significant differences in the new authoritative guidance from existing GAAP, the implementation of this guidance may result in material changes in our accounting for credit losses on financial instruments and will be impacted by the Company's loan and securities portfolios' composition, attributes, and quality in addition to prevailing economic conditions and forecasts at the time of adoption. As part of the Company's evaluation process, it had established a steering committee and working group, including individuals from various functional areas, to assess processes and related controls, portfolio segmentation, model development, system requirements, and needed resources, however, due to the pending merger with Fifth Third Bancorp, the Company has changed its evaluation process to incorporate the transition of the Company's assets to Fifth Third Bancorp.

ASC Topic 230 "Statement of Cash Flows." New authoritative accounting guidance under ASC Topic 230 "Statement of Cash Flows" addresses eight specific cash flow classification issues with the objective of reducing the existing diversity in practice. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

New authoritative accounting guidance under ASC Topic 230 "Statement of Cash Flows" amends prior guidance to require an entity to include amounts generally described as restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning of period and end of period total amounts shown on the statement of cash flows. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 740 "Income Taxes." New authoritative accounting guidance under ASC Topic 740 "Income Taxes" amends prior guidance to require an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 350 "Intangibles-Goodwill and Other." New authoritative accounting guidance under ASC Topic 350 "Intangibles-Goodwill and Other" amends prior guidance to eliminate Step 2 from the goodwill impairment test and require an entity to perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new authoritative guidance will be effective for reporting periods after January 1, 2020. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition.

ASC Topic 610 "Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets." New authoritative accounting guidance under ASC Topic 610 "Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets" amends prior guidance to clarify the scope of Subtopic 610-20 by defining in substance nonfinancial assets and to add guidance for partial sales of nonfinancial assets. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 310 "Receivables - Nonrefundable Fees and Other Costs." New authoritative accounting guidance under ASC Topic 310 "Receivables - Nonrefundable Fees and Other Costs" amends prior guidance by shortening the amortization period for certain callable debt securities held at a premium requiring the premium to be amortized to the earliest call date. The new authoritative guidance will be effective for reporting periods after January 1, 2019 with early adoption permitted. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition.

ASC Topic 220 "Income Statement - Reporting Comprehensive Income." New authoritative accounting guidance under ASC Topic 220 "Income Statement - Reporting Comprehensive Income" allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from enactment of H.R. 1, originally known as the "Tax Cuts and Jobs Act." The new authoritative guidance will be effective for reporting periods after January 1, 2019 with early adoption permitted. The Company early adopted the new guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition. See "Accounting changes" below.

ASC Topic 820 "Fair Value Measurement." New authoritative accounting guidance under ASC Topic 820 "Fair Value Measurement" amends prior guidance to modify the disclosure requirements. The new authoritative guidance removes the requirement to disclose the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, the policy for timing of transfers between levels, the valuation processes for Level 3 fair value measurements. It also adds the requirement to disclose the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. The new authoritative guidance will be effective for reporting periods after January 1, 2020 with early adoption permitted. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition.

Accounting changes. The Company adopted the new authoritative accounting guidance under ASC Topic 606, "Revenue from Contracts with Customers" on January 1, 2018 using the modified retrospective transition method for contracts that were not completed at the date of initial application. The Company recognized a cumulative effect reduction to the beginning retained earnings totaling $683 thousand. This amount relates to lease financing revenue where the Company's performance obligation is over time. Previously, such revenue was recognized immediately. See "Lease financing revenue, net" below.

The new authoritative accounting guidance under ASC Topic 606 requires an entity to recognize revenue in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. To achieve this, the Company takes the following steps: identify the contract(s) with a customer; identify the performance obligations in the contract; determine the transaction price; allocate the transaction price to the performance obligations in the contract; and recognize revenue when (or as) the Company satisfies a performance obligation. The non-interest revenue streams that are considered to be in the scope of this new guidance are discussed below.

Lease financing revenue, net. Fees from the sale of third-party equipment maintenance contracts are included within lease financing revenue, net. The Company sells third-party equipment maintenance contracts and provides customers with an asset and maintenance contract management tool over the life of the maintenance contract. Since the Company provides support for the asset and maintenance contract management tool, the Company's performance obligation is satisfied over the life of the maintenance contract, and the fees are recognized monthly over the life of the maintenance contract. Payment is typically received at the time of sale of the maintenance contract.

Treasury management fees and consumer and other deposit service fees. Deposit related fees (account analysis fees, monthly service fees, and other related fees) are included within treasury management fees and consumer and other deposit service fees. The Company's performance obligation is ongoing and either party may cancel at any time. These fees are generally recognized as the services are rendered on a monthly basis. Payment is typically received monthly.

Wealth management fees. Wealth management fees include revenue from the management and advisement of client assets and trust administration. The Company's performance obligation is generally satisfied over time, and the fees are recognized monthly. Payment is typically received quarterly or annually.

Card fees. Card fees include debit and credit card interchange fees and ATM fees. For debit and credit card transactions, the Company considers the merchant as the customer for interchange revenue with the performance obligation being satisfied when the cardholder purchases goods or services from the merchant. Interchange revenue is recognized as the services are provided. The Company's performance obligation for ATM fees is satisfied when services are provided, and the fees are recognized at that time. Payment is typically received immediately or in the following month.

Capital markets and international banking fees. Capital markets and international banking fees include M&A advisory and syndication fees. The Company's performance obligation is generally satisfied over time, and the fees are recognized monthly. For M&A advisory fees, a portion of the payment is received at the beginning of the engagement with the remainder received once the transaction is completed. For syndication fees, payment is received annually.

The Company also adopted the new authoritative accounting guidance under ASC Topic 825 "Financial Instruments" and ASC Topic 220 "Income Statement - Reporting Comprehensive Income" on January 1, 2018. The Company recognized a cumulative effect increase to the beginning retained earnings and accumulated other comprehensive income totaling $385 thousand under ASC Topic 825 representing the fair value adjustment to equity securities at the date of initial application. In addition, the Company reclassified $729 thousand from accumulated other comprehensive loss to retained earnings for the stranded tax effects resulting from enactment of the Tax Cuts and Jobs Act at the date of initial application of the new guidance under ASC Topic 220.

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Earnings Per Common Share

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Common Share

Earnings Per Common Share

Earnings per common share is computed using the two-class method. Basic earnings per common share is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding during the applicable period, excluding outstanding participating securities. Participating securities include non-vested restricted stock awards and restricted stock units, though no actual shares of common stock related to restricted stock units are issued until the settlement of such units, to the extent holders of these securities receive non-forfeitable dividends or dividend equivalents at the same rate as holders of the Company's common stock. Diluted earnings per common share is computed using the weighted-average number of shares determined for the basic earnings per common share computation plus the dilutive effect of stock compensation using the treasury stock method.

The following table presents a reconciliation of the number of shares used in the calculation of basic and diluted earnings per common share (amounts in thousands, except share and per share data).

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Distributed earnings allocated to common stock	$	20,468	$	17,823	$	61,223	$	51,783
Undistributed earnings	22,246		43,020		76,781		108,063
Net income	42,714		60,843		138,004		159,846
Less: preferred stock dividends	3,000		2,002		9,100		6,007
Plus: return from preferred stockholders due to redemption (1)	—		—		15,280		—
Net income available to common stockholders for basic earnings per common share	39,714		58,841		144,184		153,839
Plus: preferred stock dividends on convertible preferred stock	—		2		—		7
Less: earnings allocated to participating securities	1		1		4		3
Earnings allocated to common stockholders for diluted earnings per common share	$	39,713	$	58,842	$	144,180	$	153,843
Weighted average shares outstanding for basic earnings per common share	84,369,519		83,891,175		84,230,835		83,799,694
Dilutive effect of:
Stock options	463,024		502,794		508,270		564,541
Restricted shares and units	502,566		379,684		423,115		404,850
Convertible preferred stock	—		6,144		—		6,867
Total dilutive effect of equity awards and convertible preferred stock	965,590		888,622		931,385		976,258
Weighted average shares outstanding for diluted earnings per common share	85,335,109		84,779,797		85,162,220		84,775,952
Basic earnings per common share	$	0.47	$	0.70	$	1.71	$	1.84
Diluted earnings per common share	0.47		0.69		1.69		1.81

⁽¹⁾  Represents the excess carrying amount over the redemption price of the 8% Series A non-cumulative perpetual preferred stock redeemed in the first quarter of 2018.

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Investment Securities

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Investment Securities

Investment Securities

Amortized cost and fair value of investment securities, excluding marketable equity securities and non-marketable FHLB and FRB stock, were as follows as of the dates indicated (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
September 30, 2018
Available for Sale
U.S. Government sponsored agencies and enterprises	$	5,087	$	—	$	(85	)	$	5,002
States and political subdivisions	335,034		8,928		(706		)	343,256
Residential mortgage-backed securities	1,344,270		1,209		(29,205		)	1,316,274
Commercial mortgage-backed securities	41,070		62		(92		)	41,040
Corporate bonds	5,065		—		(1		)	5,064
Total Available for Sale	1,730,526		10,199		(30,089		)	1,710,636
Held to Maturity
States and political subdivisions	899,865		12,991		(3,562		)	909,294
Residential mortgage-backed securities	23,217		245		—			23,462
Total Held to Maturity	923,082		13,236		(3,562		)	932,756
Total	$	2,653,608	$	23,435	$	(33,651	)	$	2,643,392
December 31, 2017
Available for Sale
U.S. Government sponsored agencies and enterprises	$	23,013	$	3	$	(9	)	$	23,007
States and political subdivisions	363,813		15,998		(486		)	379,325
Residential mortgage-backed securities	861,594		3,035		(11,930		)	852,699
Commercial mortgage-backed securities	71,554		612		(131		)	72,035
Corporate bonds	70,155		84		(42		)	70,197
Equity securities (1)	11,236		—		(173		)	11,063
Total Available for Sale	1,401,365		19,732		(12,771		)	1,408,326
Held to Maturity
States and political subdivisions	878,400		32,559		(447		)	910,512
Residential mortgage-backed securities	80,682		1,261		—			81,943
Total Held to Maturity	959,082		33,820		(447		)	992,455
Total	$	2,360,447	$	53,552	$	(13,218	)	$	2,400,781

⁽¹⁾  Reflected in marketable equity securities on the consolidated balance sheet following the adoption of the new guidance under ASC Topic 825 "Financial Instruments" on January 1, 2018.

The increase in investment securities was due to investments in residential mortgage-backed securities in the nine months ended September 30, 2018. The Company has no direct exposure to the State of Illinois in its investment securities portfolio, but approximately 20% of the state and political subdivisions portfolio consisted of securities issued by municipalities located in Illinois as of September 30, 2018. Approximately 95% of the state and political subdivisions securities were general obligation issues, and 27% were insured or had another form of credit enhancement as of September 30, 2018.

Unrealized losses on investment securities by length of time in a continuous unrealized loss position and the fair value of the related securities at September 30, 2018 were as follows (in thousands):

	Less Than 12 Months					12 Months or More					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
	Value		Losses			Value		Losses			Value		Losses
Available for Sale
U.S. Government sponsored agencies and enterprises	$	5,002	$	(85	)	$	—	$	—		$	5,002	$	(85	)
States and political subdivisions	27,107		(140		)	18,453		(566		)	45,560		(706		)
Residential mortgage-backed securities	765,346		(11,848		)	411,324		(17,357		)	1,176,670		(29,205		)
Commercial mortgage-backed securities	16,989		(46		)	11,713		(46		)	28,702		(92		)
Corporate bonds	5,064		(1		)	—		—			5,064		(1		)
Total Available for Sale	819,508		(12,120		)	441,490		(17,969		)	1,260,998		(30,089		)
Held to Maturity
States and political subdivisions	289,842		(2,824		)	16,463		(738		)	306,305		(3,562		)
Total	$	1,109,350	$	(14,944	)	$	457,953	$	(18,707	)	$	1,567,303	$	(33,651	)

Unrealized losses on investment securities by length of time in a continuous unrealized loss position and the fair value of the related securities at December 31, 2017 were as follows (in thousands):

	Less Than 12 Months					12 Months or More					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
	Value		Losses			Value		Losses			Value		Losses
Available for Sale
U.S. Government sponsored agencies and enterprises	$	5,111	$	(9	)	$	—	$	—		$	5,111	$	(9	)
States and political subdivisions	9,016		(29		)	18,754		(457		)	27,770		(486		)
Residential mortgage-backed securities	256,769		(1,853		)	407,224		(10,077		)	663,993		(11,930		)
Commercial mortgage-backed securities	19,483		(20		)	14,583		(111		)	34,066		(131		)
Corporate bonds	7,052		(8		)	9,963		(34		)	17,015		(42		)
Equity securities	11,063		(173		)	—		—			11,063		(173		)
Total Available for Sale	308,494		(2,092		)	450,524		(10,679		)	759,018		(12,771		)
Held to Maturity
States and political subdivisions	45,499		(257		)	12,561		(190		)	58,060		(447		)
Total	$	353,993	$	(2,349	)	$	463,085	$	(10,869	)	$	817,078	$	(13,218	)

The total number of security positions in the investment portfolio in an unrealized loss position at September 30, 2018 was 761 compared to 471 at December 31, 2017. The increase in the total number of security positions in a continuous unrealized loss position and the increase in the unrealized losses from December 31, 2017 to September 30, 2018 was due to the increases in market interest rates. Changes in market interest rates can significantly influence the fair value of securities, and the fair value of our municipal securities portfolio would decline substantially if interest rates increase materially.

Declines in the fair value of available for sale securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses to the extent the impairment is related to credit losses. The amount of the impairment related to other factors is recognized in other comprehensive income. In estimating other-than-temporary impairment losses, management considers, among other things, (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, and (iii) whether the Company is more likely than not to sell the security before recovery of its cost basis.

As of September 30, 2018, management does not have the intent to sell any of the securities in the table above and believes that it is more likely than not that the Company will not have to sell any such securities before a recovery of cost. The fair value is expected to recover as the securities approach their maturity date or repricing date or if market yields for such investments decline. Accordingly, as of September 30, 2018, management believes the impairments detailed in the table above are temporary.

Net gains (losses) recognized on investment securities were as follows (in thousands):

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2018			2017		2018			2017
Realized gains	$	42		$	83	$	192		$	457
Realized losses	(127		)	—		(537		)	(6		)
Net (losses) gains	$	(85	)	$	83	$	(345	)	$	451

The amortized cost and fair value of investment securities as of September 30, 2018 by contractual maturity are shown below. Maturities may differ from contractual maturities in mortgage-backed securities because the mortgages underlying the securities may be called or repaid without any penalties. Therefore, mortgage-backed securities are not included in the maturity categories in the following maturity summary.

	Amortized		Fair
(In thousands)	Cost		Value
Available for sale:
Due in one year or less	$	44,036	$	44,350
Due after one year through five years	128,692		131,525
Due after five years through ten years	39,263		39,458
Due after ten years	133,195		137,989
Residential and commercial mortgage-backed securities	1,385,340		1,357,314
	1,730,526		1,710,636
Held to maturity:
Due in one year or less	66,747		67,040
Due after one year through five years	150,122		154,149
Due after five years through ten years	230,783		234,855
Due after ten years	452,213		453,250
Residential mortgage-backed securities	23,217		23,462
	923,082		932,756
Total	$	2,653,608	$	2,643,392

Investment securities with a carrying amount of $794.1 million at September 30, 2018 and $726.1 million at December 31, 2017 were pledged as collateral on public deposits and for other purposes as required or permitted by law, while only $710.4 million and $625.2 million were required to be pledged at September 30, 2018 and December 31, 2017, respectively.

Investment securities held to maturity with a carrying amount of $2.6 million were transferred to the available for sale portfolio and subsequently sold during the first quarter of 2018. These investment securities were obligations of states and political subdivisions that were downgraded and no longer met our credit criteria.

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Loans

9 Months Ended

Sep. 30, 2018

Receivables [Abstract]

Loans

Loans

Loans consist of the following at (in thousands):

	September 30, 2018		December 31, 2017
Commercial loans	$	4,936,536	$	4,786,180
Commercial loans collateralized by assignment of lease payments	2,065,588		2,113,135
Commercial real estate	3,832,032		4,147,529
Residential real estate	1,403,087		1,432,458
Construction real estate	548,882		406,849
Indirect vehicle	790,573		667,928
Home equity	181,477		219,098
Other consumer loans	85,705		73,141
Total loans, excluding purchased credit-impaired loans	13,843,880		13,846,318
Purchased credit-impaired loans	91,072		119,744
Total loans	$	13,934,952	$	13,966,062

Loans are made to individuals as well as commercial and tax exempt entities. Specific loan terms vary as to interest rate, repayment, and collateral requirements based on the type of loan requested and the credit worthiness of the prospective borrower. Except for commercial loans collateralized by assignment of lease payments, asset-based loans, residential real estate loans, and indirect vehicle loans, credit risk tends to be geographically concentrated in that a majority of the loan customers are located in Illinois.

The Company's extension of credit is governed by its Credit Risk Policy, which was established to control the quality of the Company's loans. This policy is reviewed and approved by the Enterprise Risk Committee of the Company's Board of Directors on an annual basis.

Commercial Loans. Commercial credit is extended mostly to middle market customers. Such credits are typically comprised of working capital loans, loans for physical asset expansion, asset acquisition loans and other business loans. Loans to closely held businesses will generally be guaranteed in full or for a significant amount by the businesses' principal owners. Commercial loans are made based primarily on the historical cash flow of the borrower and secondarily on the underlying collateral provided by the borrower. The cash flows of borrowers, however, may not perform as forecasted and collateral securing loans may fluctuate in value due to economic or individual performance factors. Minimum standards and underwriting guidelines have been established for all commercial loan types. Asset-based loans, also included in commercial loans, are made to businesses with the primary source of repayment derived from payments on the related assets securing the loan. Collateral for these loans may include accounts receivable, inventory and equipment, and is monitored regularly to ensure ongoing sufficiency of collateral coverage and quality. The primary risk for these loans is a significant decline in collateral values due to general market conditions. Loan terms that mitigate these risks include typical industry amortization schedules, percentage of collateral advances, maintenance of cash collateral accounts and regular asset monitoring. Because of the national scope of our asset-based lending, the risk of these loans is also diversified by geography.

Commercial Loans Collateralized by Assignment of Lease Payments ("Lease Loans"). The Company makes lease loans to lessors where the underlying leases are with both investment grade and non-investment grade companies. Investment grade lessees are companies rated in one of the four highest categories by Moody's Investor Services. Whether or not companies fall into this category, each lease loan is considered on its individual merit based on the financial wherewithal of the lessee using financial information available at the time of underwriting. In addition, leases that transfer substantially all of the benefits and risk related to the equipment ownership are classified as direct finance leases and are included in lease loans.

Commercial Real Estate Loans. Commercial real estate loans are subject to underwriting standards and processes similar to commercial loans. These loans are viewed primarily as property income based loans and the repayment of these loans is largely dependent on the successful operation of the property, which also serves as collateral for the loan. In addition, $1.2 billion of commercial real estate loans at September 30, 2018 were secured by owner-occupied properties where the primary source of repayment is the cash flow from the ongoing operations and activities conducted by the owner of the property. Loan performance may be adversely affected by factors impacting the general economy or conditions specific to the real estate market such as geographic location and/or property type.

Construction Real Estate Loans. The Company defines construction loans as loans where the loan proceeds are monitored by the Company and used exclusively for the improvement of real estate in which the Company holds a mortgage. Due to the inherent risk in this type of loan, these loans are subject to other industry specific policy guidelines outlined in the Company's Credit Risk Policy.

Consumer Related Loans. The Company originates direct and indirect consumer loans, including residential real estate, home equity lines and loans, credit cards, and indirect vehicle loans (motorcycle, marine, recreational, and powersports vehicles). Each loan type is underwritten based upon several factors including debt to income, type of collateral and loan to collateral value, credit history, and the Company's relationship with the borrower. Indirect loan and credit card underwriting involves the use of risk-based pricing in the underwriting process.

Purchased credit-impaired loans. Purchased credit-impaired loans are accounted for under ASC Topic 310-30, which include purchased credit-impaired loans acquired through business combinations, FDIC-assisted transactions, and repurchase transactions with the Government National Mortgage Association ("GNMA"). The loans repurchased from GNMA were originally sold by the Company with servicing retained and subsequently became delinquent. These loans are also insured by the Federal Housing Administration (commonly referred to as "FHA") or the U.S. Department of Veterans Affairs (commonly referred to as "VA") where the Company would be able to recover the principal balance of these loans. All repurchases from GNMA are at the Company's discretion.

Pledged loans. A collateral pledge agreement exists whereby at all times, the Company must keep on hand, free of all other pledges, liens, and encumbrances, loans with unpaid principal balances aggregating no less than 160% for qualifying first mortgage loans, 170% for home equity loans, 157% for qualifying commercial real estate loans and 105% for loans held for sale, of the outstanding advances from the Federal Home Loan Bank.  As of September 30, 2018 and December 31, 2017, the Company had $3.9 billion and $4.7 billion, respectively, of loans pledged as collateral for long-term Federal Home Loan Bank advances and third party letters of credit, while only $3.1 billion were required to be pledged at September 30, 2018 and December 31, 2017. The Company also has a collateral pledge agreement with the Federal Reserve Bank. As of September 30, 2018 and December 31, 2017, the Company had $859.0 million and $902.2 million, respectively, of loans pledged as collateral at the Federal Reserve Bank for the discount window as a backup liquidity funding source.

The following table presents the contractual aging of the recorded investment in past due loans by class of loans as of September 30, 2018 and December 31, 2017 (in thousands):

	Current		30-59 Days Past Due		60-89 Days Past Due		Loans Past Due 90 Days or More		Total Past Due		Total
September 30, 2018
Commercial	$	4,927,393	$	3,487	$	1,077	$	4,579	$	9,143	$	4,936,536
Commercial collateralized by assignment of lease payments	2,032,510		29,858		2,458		762		33,078		2,065,588
Commercial real estate:
Health care	664,187		269		—		—		269		664,456
Industrial	865,914		—		—		2,811		2,811		868,725
Multifamily	503,597		128		—		529		657		504,254
Retail	479,167		413		—		819		1,232		480,399
Office	418,330		—		—		120		120		418,450
Other	887,428		2,547		175		5,598		8,320		895,748
Residential real estate	1,388,338		659		2,610		11,480		14,749		1,403,087
Construction real estate	548,882		—		—		—		—		548,882
Indirect vehicle	783,161		4,747		1,847		818		7,412		790,573
Home equity	175,747		2,650		836		2,244		5,730		181,477
Other consumer	85,284		169		113		139		421		85,705
Total loans, excluding purchased credit-impaired loans	13,759,938		44,927		9,116		29,899		83,942		13,843,880
Purchased credit-impaired loans	53,843		2,809		3,904		30,516		37,229		91,072
Total loans	$	13,813,781	$	47,736	$	13,020	$	60,415	$	121,171	$	13,934,952
Non-performing loan aging	$	39,737	$	2,932	$	1,163	$	29,899	$	33,994	$	73,731
December 31, 2017
Commercial	$	4,769,244	$	1,702	$	6,926	$	8,308	$	16,936	$	4,786,180
Commercial collateralized by assignment of lease payments	2,099,246		11,320		1,878		691		13,889		2,113,135
Commercial real estate:
Health care	710,722		—		—		—		—		710,722
Industrial	908,394		—		—		755		755		909,149
Multifamily	601,844		688		—		732		1,420		603,264
Retail	503,224		—		—		474		474		503,698
Office	453,960		—		956		1,454		2,410		456,370
Other	956,181		7,035		76		1,034		8,145		964,326
Residential real estate	1,410,473		12,359		1,907		7,719		21,985		1,432,458
Construction real estate	404,595		2,254		—		—		2,254		406,849
Indirect vehicle	661,028		4,905		1,083		912		6,900		667,928
Home equity	210,831		3,161		1,073		4,033		8,267		219,098
Other consumer	72,846		202		36		57		295		73,141
Total loans, excluding purchased credit-impaired loans	13,762,588		43,626		13,935		26,169		83,730		13,846,318
Purchased credit-impaired loans	63,937		8,749		3,997		43,061		55,807		119,744
Total loans	$	13,826,525	$	52,375	$	17,932	$	69,230	$	139,537	$	13,966,062
Non-performing loan aging	$	36,879	$	8,799	$	4,961	$	26,169	$	39,929	$	76,808

The following table presents the recorded investment in non-accrual loans and loans past due ninety days or more and still accruing by class of loans, excluding purchased credit-impaired loans, as of September 30, 2018 and December 31, 2017 (in thousands):

	September 30, 2018				December 31, 2017
			Loans past due				Loans past due
	Non-accrual		90 days or more and still accruing		Non-accrual		90 days or more and still accruing
Commercial	$	24,086	$	—	$	14,001	$	3,500
Commercial collateralized by assignment of lease payments	630		662		490		531
Commercial real estate:
Health care	—		—		—		—
Industrial	2,811		—		8,807		—
Multifamily	568		—		860		—
Office	432		—		2,772		—
Retail	819		—		590		—
Other	5,887		39		8,016		190
Residential real estate	20,080		381		18,374		1,210
Construction real estate	—		—		—		—
Indirect vehicle	4,051		73		3,019		81
Home equity	13,068		—		14,305		—
Other consumer	5		139		4		58
Total	$	72,437	$	1,294	$	71,238	$	5,570

The Company utilizes an internal asset classification system as a means of reporting problem and potential problem loans. Under the Company's risk rating system, the Company classifies potential problem and problem loans as “Special Mention,” “Substandard,” and “Doubtful.” Substandard loans include those characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Loans classified as Doubtful have all the weaknesses inherent in those classified as Substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. Loans that do not currently expose the Company to sufficient risk to warrant classification in one of the aforementioned categories but possess weaknesses that deserve management's close attention are deemed to be Special Mention. Loans rated but not adversely classified are deemed to be Pass. Risk ratings are updated any time the situation warrants and at least annually.

Loans not rated are included in groups of homogeneous loans with similar risk and loss characteristics and are not included in the table below. The following tables present the risk category of loans by class of loans based on the most recent analysis performed, excluding purchased credit-impaired loans, as of September 30, 2018 and December 31, 2017 (in thousands):

	Pass		Special Mention		Substandard		Doubtful		Total
September 30, 2018
Commercial	$	4,627,512	$	161,909	$	147,115	$	—	$	4,936,536
Commercial collateralized by assignment of lease payments	2,051,164		8,422		6,002		—		2,065,588
Commercial real estate:
Health care	544,562		49,515		70,379		—		664,456
Industrial	840,860		14,820		13,045		—		868,725
Multifamily	500,369		606		3,279		—		504,254
Retail	457,416		19,862		3,121		—		480,399
Office	408,532		1,964		7,954		—		418,450
Other	857,001		10,463		28,284		—		895,748
Construction real estate	546,012		1,645		1,225		—		548,882
Total	$	10,833,428	$	269,206	$	280,404	$	—	$	11,383,038
December 31, 2017
Commercial	$	4,535,111	$	147,232	$	103,837	$	—	$	4,786,180
Commercial collateralized by assignment of lease payments	2,095,668		7,527		9,940		—		2,113,135
Commercial real estate:
Health care	640,751		33,672		36,299		—		710,722
Industrial	885,524		12,411		11,214		—		909,149
Multifamily	595,818		146		7,300		—		603,264
Retail	492,830		8,326		2,542		—		503,698
Office	452,902		696		2,772		—		456,370
Other	891,703		37,682		34,941		—		964,326
Construction real estate	406,849		—		—		—		406,849
Total	$	10,997,156	$	247,692	$	208,845	$	—	$	11,453,693

Approximately $35.3 million and $35.6 million of the substandard loans were non-performing as of September 30, 2018 and December 31, 2017, respectively.

For residential real estate, home equity, indirect vehicle and other consumer loan classes, the Company also evaluates credit quality based on the aging status of the loan, which was previously presented, and by payment activity. The following table presents the recorded investment in those loan classes based on payment activity, excluding purchased credit-impaired loans, as of September 30, 2018 and December 31, 2017 (in thousands):

	Performing		Non-performing		Total
September 30, 2018
Residential real estate	$	1,382,626	$	20,461	$	1,403,087
Indirect vehicle	786,449		4,124		790,573
Home equity	168,409		13,068		181,477
Other consumer	85,561		144		85,705
Total	$	2,423,045	$	37,797	$	2,460,842
December 31, 2017
Residential real estate	$	1,412,874	$	19,584	$	1,432,458
Indirect vehicle	664,828		3,100		667,928
Home equity	204,793		14,305		219,098
Other consumer	73,079		62		73,141
Total	$	2,355,574	$	37,051	$	2,392,625

The recorded investment in residential mortgage loans secured by residential real estate properties (including purchased credit-impaired loans) for which foreclosure proceedings are in process totaled $53.7 million and $43.6 million at September 30, 2018 and December 31, 2017, respectively.

The following tables present loans individually evaluated for impairment by class of loans, excluding purchased credit-impaired loans, as of September 30, 2018 and December 31, 2017 (in thousands):

	September 30, 2018
									Three Months Ended				Nine Months Ended
	Unpaid Principal Balance		Recorded Investment		Partial Charge-offs		Allowance for Loan Losses Allocated		Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial	$	35,407	$	14,641	$	20,766	$	—	$	17,634	$	222	$	10,430	$	222
Commercial collateralized by assignment of lease payments	—		—		—		—		—		—		—		—
Commercial real estate:
Health care	—		—		—		—		—		—		—		—
Industrial	3,426		2,811		615		—		3,491		—		1,176		—
Multifamily	—		—		—		—		—		—		—		—
Retail	—		—		—		—		—		—		—		—
Office	—		—		—		—		—		—		—		—
Other	—		—		—		—		—		—		1,096		52
Residential real estate	3,847		3,809		38		—		2,260		—		3,261		—
Construction real estate	—		—		—		—		—		—		—		—
Indirect vehicle	775		449		326		—		853		3		660		31
Home equity	79		79		—		—		79		—		27		—
Other consumer	—		—		—		—		—		—		—		—
With an allowance recorded:
Commercial	7,996		7,996		—		797		8,559		85		6,147		182
Commercial collateralized by assignment of lease payments	—		—		—		—		—		—		110		—
Commercial real estate:
Health care	—		—		—		—		—		—		357		28
Industrial	—		—		—		—		—		—		2,126		8
Multifamily	—		—		—		—		—		—		—		—
Retail	—		—		—		—		—		—		—		—
Office	—		—		—		—		—		—		—		—
Other	4,766		4,766		—		438		4,894		—		3,032		124
Residential real estate	19,604		17,591		2,013		1,621		17,590		—		18,496		32
Construction real estate	—		—		—		—		—		—		—		—
Indirect vehicle	—		—		—		—		—		—		—		—
Home equity	29,741		26,890		2,851		1,534		27,102		—		28,563		30
Other consumer	—		—		—		—		—		—		—		—
Total	$	105,641	$	79,032	$	26,609	$	4,390	$	82,462	$	310	$	75,481	$	709

	December 31, 2017
									Year Ended
	Unpaid Principal Balance		Recorded Investment		Partial Charge-offs		Allowance for Loan Losses Allocated		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial	$	8,312	$	7,771	$	541	$	—	$	5,595	$	95
Commercial collateralized by assignment of lease payments	—		—		—		—		301		—
Commercial real estate:
Health care	—		—		—		—		—		—
Industrial	—		—		—		—		1,260		8
Multifamily	—		—		—		—		1,261		29
Retail	—		—		—		—		814		27
Office	527		527		—		—		1,426		18
Other	10,597		10,597		—		—		2,312		128
Residential real estate	1,950		1,912		38		—		483		—
Construction real estate	—		—		—		—		—		—
Indirect vehicle	408		202		206		—		411		26
Home equity	81		81		—		—		376		—
Other consumer	—		—		—		—		—		—
With an allowance recorded:
Commercial	7,418		7,418		—		2,315		7,668		277
Commercial collateralized by assignment of lease payments	—		—		—		—		126		14
Commercial real estate:
Health care	—		—		—		—		—		—
Industrial	8,339		8,317		22		2,669		3,215		171
Multifamily	568		568		—		320		426		—
Retail	—		—		—		—		1,345		28
Office	2,293		2,277		16		752		636		4
Other	—		—		—		—		29		—
Residential real estate	21,380		19,014		2,366		2,158		17,616		25
Construction real estate	—		—		—		—		—		—
Indirect vehicle	—		—		—		—		—		—
Home equity	30,762		28,286		2,476		2,200		27,982		54
Other consumer	—		—		—		—		—		—
Total	$	92,635	$	86,970	$	5,665	$	10,414	$	73,282	$	904

Impaired loans included accruing restructured loans of $23.0 million and $28.6 million that have been modified and are performing in accordance with those modified terms as of September 30, 2018 and December 31, 2017, respectively.  In addition, impaired loans included $24.0 million and $30.8 million of non-performing restructured loans as of September 30, 2018 and December 31, 2017, respectively.

Loans may be restructured in an effort to maximize collections from financially distressed borrowers. We use various restructuring techniques, including, but not limited to, deferring past due interest or principal, implementing an A/B note structure, redeeming past due taxes, reducing interest rates, extending maturities and modifying amortization schedules. Residential real estate loans are restructured in an effort to minimize losses while allowing borrowers to remain in their primary residences when possible.

A loan classified as a troubled debt restructuring will no longer be included in the troubled debt restructuring disclosures in the years after the restructuring if the loan performs in accordance with the terms specified by the restructuring agreement and the interest rate specified in the restructuring agreement represents a market rate at the time of modification. The specified interest rate is considered a market rate when the interest rate is equal to or greater than the rate the Company is willing to accept at the time of restructuring for a new loan with comparable risk. If there are concerns that the borrower will not be able to meet the modified terms of the loan, the loan will continue to be included in the troubled debt restructuring disclosures.

Impairment analyses on commercial-related loans classified as troubled debt restructurings are performed in conjunction with the normal allowance for loan and lease losses process. Consumer loans classified as troubled debt restructurings are aggregated in two pools that share common risk characteristics, home equity and residential real estate loans, with impairment measured on a quarterly basis based on the present value of expected future cash flows discounted at the loan's effective interest rate.

The following table presents loans that were restructured during the three months ended September 30, 2018 (dollars in thousands):

	September 30, 2018
	Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment		Charge-offs and Specific Reserves
Performing:
Residential real estate	1	$	132	$	132	$	12
Home equity	1	91		91		5
Total	2	$	223	$	223	$	17
Non-Performing:
Commercial	1	$	750	$	750	$	—
Residential real estate	3	709		709		246
Indirect vehicle	21	151		151		110
Home equity	2	396		396		219
Total	27	$	2,006	$	2,006	$	575

The following table presents loans that were restructured during the nine months endedSeptember 30, 2018 (dollars in thousands):

	September 30, 2018
	Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment		Charge-offs and Specific Reserves
Performing:
Residential real estate	2	$	220	$	220	$	21
Home equity	1	91		91		5
Total	3	$	311	$	311	$	26
Non-Performing:
Commercial	1	$	750	$	750	$	—
Residential real estate	19	3,150		3,150		1,184
Indirect vehicle	41	272		272		148
Home equity	7	606		606		233
Total	68	$	4,778	$	4,778	$	1,565

The following table presents loans that were restructured during the three months ended September 30, 2017 (dollars in thousands):

	September 30, 2017
	Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment		Charge-offs and Specific Reserves
Performing:
Commercial real estate:
Industrial	1	$	387	$	387	$	—
Retail	2	337		337		—
Other	2	3,555		3,555		—
Home equity	1	19		19		1
Total	6	$	4,298	$	4,298	$	1
Non-Performing:
Residential real estate	11	$	2,775	$	2,775	$	739
Indirect vehicle	20	153		153		105
Home equity	1	15		15		1
Total	32	$	2,943	$	2,943	$	845

The following table presents loans that were restructured during the nine months endedSeptember 30, 2017 (dollars in thousands):

	September 30, 2017
	Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment		Charge-offs and Specific Reserves
Performing:
Commercial	5	$	2,491	$	2,491	$	373
Commercial real estate
Industrial	3	3,174		3,174		—
Retail	2	337		337		—
Office	1	549		549		—
Other	3	3,703		3,703		—
Residential real estate	6	902		902		135
Home equity	4	97		97		7
Total	24	$	11,253	$	11,253	$	515
Non-Performing:
Commercial	2	$	676	$	676	$	—
Commercial real estate:
Multifamily	3	290		290		—
Retail	1	906		906		—
Residential real estate	28	5,155		5,155		1,182
Indirect vehicle	31	250		250		134
Home equity	4	608		608		58
Total	69	$	7,885	$	7,885	$	1,374

Of the troubled debt restructurings entered into during the past twelve months, none subsequently defaulted during the nine months endedSeptember 30, 2018.  Performing troubled debt restructurings are considered to have defaulted when they become 90 days or more past due post-restructuring or are placed on non-accrual status.

The following table presents the troubled debt restructurings activity during the nine months endedSeptember 30, 2018 (in thousands):

	Performing			Non-performing
Beginning balance	$	28,554		$	30,836
Additions	311			4,778
Charge-offs	—			(3,057		)
Principal payments, net	(8,010		)	(6,398		)
Removals	(77		)	(8		)
Transfer to other real estate owned	—			—
Transfers in	2,970			778
Transfers out	(778		)	(2,970		)
Ending balance	$	22,970		$	23,959

Loans removed from troubled debt restructuring status are those that were restructured in a previous calendar year at a market rate of interest and have performed in compliance with the modified terms.

The following table presents the type of modification for loans that have been restructured during the nine months endedSeptember 30, 2018 (in thousands):

	September 30, 2018
	Extended
	Maturity,				Delay in
	Amortization		Extended		Payments and/or
	and Reduction		Maturity and/or		Reduction of
	of Interest Rate		Amortization		Interest Rate		Total
Commercial	$	—	$	750	$	—	$	750
Residential real estate	2,097		862		411		3,370
Indirect vehicle	—		—		272		272
Home equity	293		404		—		697
Total	$	2,390	$	2,016	$	683	$	5,089

The following table presents the activity in the allowance for credit losses, balance in allowance for credit losses and recorded investment in loans by portfolio segment and based on impairment method as of September 30, 2018 and 2017 (in thousands):

	Commercial		Commercial collateralized by assignment of lease payments		Commercial real estate		Residential real estate			Construction real estate		Indirect vehicle			Home equity		Other consumer		Unfunded commitments		Total
September 30, 2018
Allowance for credit losses:
Three Months Ended
Beginning balance	$	40,318	$	13,095	$	65,391	$	5,732		$	26,792	$	4,738		$	4,142	$	2,582	$	1,788	$	164,578
Charge-offs	20,895		7,181		704		76			—		1,726			724		294		—		31,600
Recoveries	639		846		424		121			13		554			261		80		—		2,938
Provision	12,611		5,946		1,078		(445		)	66		(486		)	2,111		402		220		21,503
Ending balance	$	32,673	$	12,706	$	66,189	$	5,332		$	26,871	$	3,080		$	5,790	$	2,770	$	2,008	$	157,419
Nine Months Ended
Beginning balance	$	46,267	$	13,007	$	63,429	$	7,012		$	15,501	$	4,728		$	5,296	$	2,470	$	1,698	$	159,408
Charge-offs	23,831		7,897		5,801		805			—		4,878			972		954		—		45,138
Recoveries	1,143		1,246		1,515		217			443		2,397			559		399		—		7,919
Provision	9,094		6,350		7,046		(1,092		)	10,927		833			907		855		310		35,230
Ending balance	$	32,673	$	12,706	$	66,189	$	5,332		$	26,871	$	3,080		$	5,790	$	2,770	$	2,008	$	157,419
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$	797	$	—	$	438	$	1,621		$	—	$	—		$	1,534	$	—	$	754	$	5,144
Collectively evaluated for impairment	31,638		12,706		64,710		3,711			26,835		3,080			4,256		2,770		1,254		150,960
Acquired and accounted for under ASC 310-30 (1)	238		—		1,041		—			36		—			—		—		—		1,315
Total ending allowance balance	$	32,673	$	12,706	$	66,189	$	5,332		$	26,871	$	3,080		$	5,790	$	2,770	$	2,008	$	157,419
Loans:
Individually evaluated for impairment	$	22,637	$	—	$	7,577	$	21,400		$	—	$	449		$	26,969	$	—	$	—	$	79,032
Collectively evaluated for impairment	4,913,899		2,065,588		3,824,455		1,381,687			548,882		790,124			154,508		85,705		—		13,764,848
Acquired and accounted for under ASC 310-30 (1)	7,173		—		22,173		47,929			3,646		—			8,999		1,152		—		91,072
Total ending loans balance	$	4,943,709	$	2,065,588	$	3,854,205	$	1,451,016		$	552,528	$	790,573		$	190,476	$	86,857	$	—	$	13,934,952

	Commercial			Commercial collateralized  by assignment of lease payments		Commercial real estate		Residential real estate		Construction real estate			Indirect vehicle		Home equity		Other consumer		Unfunded commitments			Total
September 30, 2017
Allowance for credit losses:
Three Months Ended
Beginning balance	$	43,783		$	12,765	$	63,247	$	8,249	$	15,263		$	3,963	$	4,750	$	2,013	$	2,264		$	156,297
Charge-offs	235			188		31		541		—			1,097		439		299		—			2,830
Recoveries	719			—		1,432		38		502			498		149		82		—			3,420
Provision	1,715			240		935		94		(707		)	1,317		422		489		12			4,517
Ending balance	$	45,982		$	12,817	$	65,583	$	7,840	$	15,058		$	4,681	$	4,882	$	2,285	$	2,276		$	161,404
Nine Months Ended
Beginning balance	$	44,661		$	12,238	$	51,807	$	5,971	$	14,758		$	3,421	$	4,689	$	1,821	$	2,476		$	141,842
Charge-offs	1,103			188		1,378		901		—			3,438		873		1,243		—			9,124
Recoveries	3,568			712		2,312		624		661			1,715		724		420		—			10,736
Provision	(1,144		)	55		12,842		2,146		(361		)	2,983		342		1,287		(200		)	17,950
Ending balance	$	45,982		$	12,817	$	65,583	$	7,840	$	15,058		$	4,681	$	4,882	$	2,285	$	2,276		$	161,404
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$	1,012		$	585	$	855	$	2,169	$	—		$	—	$	2,562	$	—	$	1,220		$	8,403
Collectively evaluated for impairment	44,879			12,232		63,868		5,671		15,023			4,681		2,320		2,285		1,056			152,015
Acquired and accounted for under ASC 310-30 (1)	91			—		860		—		35			—		—		—		—			986
Total ending allowance balance	$	45,982		$	12,817	$	65,583	$	7,840	$	15,058		$	4,681	$	4,882	$	2,285	$	2,276		$	161,404
Loans:
Individually evaluated for impairment	$	10,642		$	921	$	11,999	$	19,370	$	—		$	349	$	27,468	$	—	$	—		$	70,749
Collectively evaluated for impairment	4,783,196			2,073,294		4,082,707		1,414,225		395,794			654,864		201,258		77,372		—			13,682,710
Acquired and accounted for under ASC 310-30 (1)	13,677			—		32,063		68,071		5,183			—		11,200		1,725		—			131,919
Total ending loans balance	$	4,807,515		$	2,074,215	$	4,126,769	$	1,501,666	$	400,977		$	655,213	$	239,926	$	79,097	$	—		$	13,885,378

⁽¹⁾  Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 “Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality.”

Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date without a carryover of the related allowance for loan and lease losses. These acquired loans are segregated into three types: pass rated loans with no discount attributable to credit quality, non-impaired loans with a discount attributable at least in part to credit quality, and impaired loans with evidence of significant credit deterioration.  

• Pass rated loans (typically performing loans) are accounted for in accordance with ASC Topic 310-20 "Nonrefundable Fees and Other Costs" as these loans do not have evidence of credit deterioration since origination.

• Non-impaired loans (typically performing substandard loans) are accounted for in accordance with ASC Topic 310-30 if they display at least some level of credit deterioration since origination.

• Impaired loans (typically substandard loans on non-accrual status) are accounted for in accordance with ASC Topic 310-30 as they display significant credit deterioration since origination.

For pass rated loans (non-purchased credit-impaired loans), the difference between the estimated fair value of the loans and the principal outstanding is accreted over the remaining life of the loans.

In accordance with ASC 310-30, for both purchased non-impaired loans and purchased credit-impaired loans, the loans are pooled by loan type and the difference between contractually required payments at acquisition and the cash flows expected to be collected is referred to as the non-accretable difference. Further, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan pools when there is a reasonable expectation about the amount and timing of such cash flows.

Substantially all of the loans acquired in FDIC-assisted transactions displayed at least some level of credit deterioration and as such are included as non-impaired and impaired loans as described immediately above.

During the nine months endedSeptember 30, 2018, there was a negative provision for credit losses of $119 thousand and net recoveries of $256 thousand in relation to purchased credit-impaired loans. There was $1.3 million and $1.2 million in allowance for loan and lease losses related to these purchased credit-impaired loans at September 30, 2018 and December 31, 2017, respectively.  The provision for credit losses and accompanying charge-offs are included in the table above.

Changes in the accretable yield for loans acquired and accounted for under ASC 310-30 were as follows for the three and nine months endedSeptember 30, 2018 and 2017 (in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2018			2017			2018			2017
Balance at beginning of period	$	8,241		$	12,686		$	12,069		$	16,050
Purchases	—			—			—			43
Accretion	(2,579		)	(4,315		)	(7,213		)	(9,334		)
Other (1)	236			3,453			1,042			5,065
Balance at end of period	$	5,898		$	11,824		$	5,898		$	11,824

⁽¹⁾  Primarily includes discount transfers from non-accretable discount to accretable discount due to better than expected performance of loan pools acquired and accounted for under ASC 310-30.

In our FDIC-assisted transactions, the fair value of purchased credit-impaired loans, on the acquisition date, was determined based on assigned risk ratings, expected cash flows and the fair value of loan collateral. The fair value of loans that were non-impaired was determined based on estimates of losses on defaults and other market factors. Due to the loss-share agreements with the FDIC, we recorded a receivable (FDIC indemnification asset) from the FDIC equal to the present value of the corresponding reimbursement percentages on the estimated losses embedded in the loan portfolio.

For other loans acquired through business combinations, the fair value of purchased credit-impaired loans, on the acquisition date, was determined based on assigned risk ratings, expected cash flows and the fair value of loan collateral. The fair value of loans that were non-impaired was determined based on estimates of losses on defaults and other market factors.

The carrying amount of loans acquired through a business combination by loan pool type are as follows (in thousands):

September 30, 2018	Purchased Credit-Impaired Loans		Purchased Non-Credit-Impaired Loans		Total
Covered loans (1):
Consumer related	$	12,979	$	—	$	12,979
Non-covered loans:
Commercial loans	7,173		122,630		129,803
Commercial loans collateralized by assignment of lease payments	—		14,114		14,114
Commercial real estate	22,173		536,351		558,524
Construction real estate	3,646		1,618		5,264
Consumer related	4,857		212,838		217,695
Total non-covered loans	37,849		887,551		925,400
Total acquired	$	50,828	$	887,551	$	938,379

⁽¹⁾  Covered loans refer to loans covered under loss-sharing agreements with the FDIC. The remaining loss-share agreements expire between 2019 and 2020.

In addition to loans acquired through a business combination noted in the table above, consumer related purchased credit-impaired loans include loans repurchased from GNMA of $40.2 million as of September 30, 2018.

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Goodwill and Intangibles

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangibles

Goodwill and Intangibles

The excess of the cost of an acquisition over the fair value of the net assets acquired, including core deposit and client relationship intangibles, consists of goodwill. Under ASC Topic 350, goodwill is subject to at least annual assessments for impairment by applying a fair value based test. The Company reviews goodwill to determine potential impairment annually, or more frequently if events and circumstances indicate that goodwill might be impaired, by comparing the carrying value of the reporting units with the fair value of the reporting units.

The Company's annual assessment date is as of December 31. Goodwill is tested for impairment at the reporting unit level. The Company has three reporting units: Banking, Leasing, and Mortgage Banking. The carrying amount of goodwill was $1.0 billion at September 30, 2018 and December 31, 2017. On April 12, 2018, the Company announced the discontinuation of its national mortgage origination business, which includes substantially all originations outside of the Company's consumer banking footprint in the Chicagoland area. As a result, the Company recorded an impairment loss in the amount of $3.6 million within the Mortgage Banking segment in the second quarter of 2018. No impairment losses were recognized during the nine months endedSeptember 30, 2017.

The following table presents the carrying amount of goodwill by segment for the nine months endedSeptember 30, 2018 (in thousands):

	Banking		Leasing		Mortgage Banking			Total
Balance at beginning of period	$	959,285	$	40,640	$	3,623		$	1,003,548
Impairment	—		—		(3,623		)	(3,623		)
Balance at end of period	$	959,285	$	40,640	$	—		$	999,925

The Company has other intangible assets consisting of core deposit and client relationship intangibles that had a remaining weighted average amortization period of approximately 12 years as of September 30, 2018.

The following table presents the changes during the nine months endedSeptember 30, 2018 in the carrying amount of core deposit and client relationship intangibles, and the gross carrying amount, accumulated amortization, and net book value as of September 30, 2018 (in thousands):

	September 30, 2018
Balance at beginning of period	$	54,766
Amortization expense	(5,652		)
Balance at end of period	$	49,114
Gross carrying amount	$	112,820
Accumulated amortization	(63,706		)
Net book value	$	49,114

The following presents the estimated future amortization expense of other intangible assets (in thousands):

Year ending December 31,	Amount
2018	$	1,799
2019	5,674
2020	5,022
2021	4,790
2022	3,806
Thereafter	28,023
	$	49,114

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Deposits

9 Months Ended

Sep. 30, 2018

Banking and Thrift [Abstract]

Deposits

Deposits

The composition of deposits was as follows as of September 30, 2018 and December 31, 2017 (in thousands):

	September 30,		December 31,
	2018		2017
Demand deposit accounts, non-interest bearing	$	6,036,012	$	6,381,512
NOW, money market, and interest bearing deposits	5,125,330		4,954,765
Savings accounts	1,180,997		1,167,810
Certificates of deposit, $250,000 or more	1,375,549		1,506,071
Other certificates of deposit	990,905		948,220
Total	$	14,708,793	$	14,958,378

Certificates of deposit of $250,000 or more included $972.3 million of brokered deposits at September 30, 2018 and $1.1 billion at December 31, 2017.  Brokered deposits typically consist of smaller individual time certificates that have the same liquidity characteristics and yields consistent with time certificates of $250,000 or more.

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Short-Term Borrowings

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Short-Term Borrowings

Short-Term Borrowings

Short-term borrowings were as follows as of September 30, 2018 and December 31, 2017 (dollars in thousands):

	September 30, 2018				December 31, 2017
	Weighted Average Interest Rate		Amount		Weighted Average Interest Rate		Amount
Customer repurchase agreements	0.77	%	$	311,605	0.27	%	$	232,789
Federal Home Loan Bank advances	2.19		500,000		1.31		625,000
Federal funds purchased	2.35		91,750		1.26		3,250
Line of credit	—		—		—		—
Total	1.71	%	$	903,355	1.03	%	$	861,039

Securities sold under agreements to repurchase are agreements in which the Company acquires funds by selling assets to another party under a simultaneous agreement to repurchase the same assets at a specified price and date.  The Company enters into repurchase agreements and also offers a demand deposit account product to customers that sweeps their balances in excess of an agreed upon target amount into overnight repurchase agreements.  All securities sold under agreements to repurchase are recorded on the face of the balance sheet. The Company pledges mortgage-backed securities as collateral for the repurchase agreements and may be required to provide additional collateral based on the fair value of those securities.

The Company had Federal Home Loan Bank ("FHLB") advances with a maturity date less than one year of $500.0 million at September 30, 2018 and $625.0 million at December 31, 2017. At September 30, 2018, the interest rate on the advances outstanding on that date had rates ranging from 1.35% to 2.42% with maturities from October 2018 to September 2019. The Company has loans pledged as collateral on these Federal Home Loan Bank advances. See Note 5. Loans.

On December 18, 2015, the Company entered into a $35.0 million unsecured line of credit at the holding company level with a correspondent bank. Interest was payable at a rate of one month LIBOR + 1.75%. The line of credit matured on June 30, 2018.

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Long-Term Borrowings

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Long-Term Borrowings

Long-Term Borrowings

Long-term borrowings were as follows as of September 30, 2018 and December 31, 2017 (dollars in thousands):

	September 30, 2018				December 31, 2017
	Weighted Average Interest Rate		Amount		Weighted Average Interest Rate		Amount
Federal Home Loan Bank advances	2.65	%	$	198,939	1.73	%	$	231,317
Notes payable	4.77		79,675		4.14		90,807
Subordinated notes, net of issuance costs	4.00		173,063		4.00		173,034
Term note	—		—		3.31		10,000
Total	3.54	%	$	451,677	2.97	%	$	505,158

The Company had Federal Home Loan Bank advances with remaining contractual maturities greater than one year of $198.9 million at September 30, 2018 and $231.3 million at December 31, 2017. As of September 30, 2018, the advances had interest rates ranging from 2.45% to 5.87% and maturities ranging from December 2019 to April 2035. The Company has loans pledged as collateral on these Federal Home Loan Bank advances. See Note 5. Loans.

The Company had notes payable to banks totaling $76.5 million and $76.3 million at September 30, 2018 and December 31, 2017, respectively, which as of September 30, 2018, were accruing interest at rates ranging from 2.25% to 7.25%, with a weighted average rate of 4.73%.  Lease investments includes equipment with an amortized cost of $92.4 million and $91.9 million at September 30, 2018 and December 31, 2017, respectively, that is pledged as collateral on these notes. The Company also had $3.2 million and $14.5 million at September 30, 2018 and December 31, 2017, respectively, in other secured borrowings (included in the notes payable above) with a weighted average rate of 5.70% as of September 30, 2018.

On August 24, 2016, the Company assumed a $16.0 million unsecured term loan at the holding company level with a correspondent bank through the merger of American Chartered Bancorp, Inc. ("American Chartered") with and into the Company on that date. Interest was payable at a rate of one month LIBOR + 1.75%, and the loan was to mature on June 30, 2020. Principal payments of $1.0 million were due quarterly until maturity. This loan was prepaid in full in the first quarter of 2018.

On November 16, 2017, MB Financial Bank issued $175.0 million in 4.00% fixed-to-floating subordinated notes that mature on December 1, 2027. The subordinated notes bear a fixed interest rate of 4.00% until December 1, 2022 and a variable interest rate of three month LIBOR + 1.873% thereafter until maturity. The subordinated notes are callable on a semi-annual basis beginning on December 1, 2022.

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Junior Subordinated Notes Issued to Capital Trusts

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Junior Subordinated Notes Issued to Capital Trusts

Junior Subordinated Notes Issued to Capital Trusts

The Company has established statutory trusts for the sole purpose of issuing trust preferred securities and related trust common securities.  The proceeds from such issuances were used by the trusts to purchase junior subordinated notes of the Company, which are the sole assets of each trust.  Concurrently with the issuance of the trust preferred securities, the Company issued guarantees for the benefit of the holders of the trust preferred securities.  The Company’s outstanding trust preferred securities qualify, and are treated by the Company, as Tier 2 regulatory capital. Prior to the completion of the American Chartered merger, the trust preferred securities qualified, and were treated by the Company, as Tier 1 regulatory capital.  The Company owns all of the common securities of each trust.  The trust preferred securities issued by each trust rank equally with the common securities in right of payment, except that if an event of default under the indenture governing the notes has occurred and is continuing, the preferred securities will rank senior to the common securities in right of payment.

The table below summarizes the outstanding junior subordinated notes and the related trust preferred securities issued by each trust as of September 30, 2018 (in thousands).

	MB Financial Capital Trust II		MB Financial Capital Trust III		MB Financial Capital Trust IV
Junior Subordinated Notes:
Principal balance	$	36,083	$	10,310	$	20,619
Annual interest rate	3-mo LIBOR + 1.40%		3-mo LIBOR + 1.50%		3-mo LIBOR + 1.52%
Stated maturity date	September 15, 2035		September 23, 2036		September 15, 2036
Call date	December 15, 2010		September 23, 2011		September 15, 2011
Trust Preferred Securities:
Face Value	$	35,000	$	10,000	$	20,000
Annual distribution rate	3-mo LIBOR + 1.40%		3-mo LIBOR + 1.50%		3-mo LIBOR + 1.52%
Issuance date	August 2005		July 2006		August 2006
Distribution dates (1)	Quarterly		Quarterly		Quarterly

	MB Financial Capital Trust V		MB Financial Capital Trust VI		FOBB Statutory Trust III (2)(4)
Junior Subordinated Notes:
Principal balance	$	30,928	$	23,196	$	5,155
Annual interest rate	3-mo LIBOR + 1.30%		3-mo LIBOR + 1.30%		3-mo LIBOR + 2.80%
Stated maturity date	December 15, 2037		October 30, 2037		January 23, 2034
Call date	December 15, 2012		October 30, 2012		January 23, 2009
Trust Preferred Securities:
Face Value	$	30,000	$	22,500	$	5,000
Annual distribution rate	3-mo LIBOR + 1.30%		3-mo LIBOR + 1.30%		3-mo LIBOR + 2.80%
Issuance date	September 2007		October 2007		December 2003
Distribution dates (1)	Quarterly		Quarterly		Quarterly

	American Chartered Statutory Trust II (3)(4)
Junior Subordinated Notes:
Principal balance	$	10,310
Annual interest rate	3-mo LIBOR + 2.75%
Stated maturity date	October 7, 2034
Call date	October 7, 2009
Trust Preferred Securities:
Face Value	$	10,000
Annual distribution rate	3-mo LIBOR + 2.75%
Issuance date	August 2004
Distribution dates (1)	Quarterly

⁽¹⁾  All distributions are cumulative and paid in cash.

⁽²⁾  FOBB Statutory Trust III was established by First Oak Brook Bancshares, Inc. (“FOBB”) prior to the Company's acquisition of FOBB in 2006, and the junior subordinated notes issued by FOBB to FOBB Statutory Trust III were assumed by the Company upon completion of the acquisition.

⁽³⁾  American Chartered Statutory Trust II was established by American Chartered prior to the Company's acquisition of American Chartered in August 2016, and the junior subordinated notes issued by American Chartered to American Chartered Statutory Trust II were assumed by the Company upon completion of the acquisition. Principal balance and face value amounts associated with American Chartered Statutory Trust II do not include acquisition accounting adjustments to such amounts, which in each case resulted in a remaining discount of $2.6 million at September 30, 2018.

⁽⁴⁾  Subsequent to September 30, 2018, the Company redeemed all of the outstanding junior subordinated notes held by American Chartered Statutory Trust II, which concurrently redeemed all of its outstanding trust preferred securities, and the Company redeemed all of the outstanding junior subordinated notes held by FOBB Statutory Trust III, which concurrently redeemed all of its outstanding trust preferred securities. See Note 18. Subsequent Events.

The trust preferred securities are subject to mandatory redemption, in whole or in part, upon repayment of the junior subordinated notes at the stated maturity date or upon redemption.  Each trust’s ability to pay amounts due on the trust preferred securities is solely dependent upon the Company making payment on the related junior subordinated notes.  The Company’s obligation under the junior subordinated notes and other relevant trust agreements, in aggregate, constitute a full and unconditional guarantee by the Company of each trust’s obligations under the trust preferred securities issued by each trust.  The Company has the right to defer payment of interest on the notes and, therefore, distributions on the trust preferred securities, for up to five years, but not beyond the stated maturity date in the table above.  During any such deferral period, the Company may not pay cash dividends on its common or preferred stock and generally may not repurchase its common or preferred stock.

On March 19, 2018, the Company redeemed the junior subordinated notes held by American Chartered Statutory Trust I and, as a result, all of the issued and outstanding three month LIBOR + 3.60% American Chartered Statutory Trust I capital (preferred) securities were concurrently redeemed. The aggregate liquidation amount of these trust preferred securities was $20.0 million. American Chartered Statutory Trust I was established by American Chartered prior to the Company's acquisition of American Chartered, and the junior subordinated notes issued by American Chartered to American Chartered Statutory Trust I were assumed by the Company upon completion of the acquisition. As a result, the Company recognized a $3.1 million loss on extinguishment of debt in the first quarter of 2018.

On August 6, 2018, the Company redeemed the junior subordinated notes held by Coal City Capital Trust I and, as a result, all of the issued and outstanding three month LIBOR + 1.80% Coal City Capital Trust I capital (preferred) securities were concurrently redeemed. The aggregate liquidation amount of these trust preferred securities was $25.0 million. Coal City Capital Trust I was established by Coal City Corporation prior to the Company's acquisition of Coal City Corporation, and the junior subordinated notes issued by Coal City Corporation to Coal City Capital Trust I were assumed by the Company upon completion of the acquisition. As a result, the Company recognized a $341 thousand loss on extinguishment of debt in the third quarter of 2018.

On September 17, 2018, the Company redeemed the junior subordinated notes held by TAYC Capital Trust II and, as a result, all of the issued and outstanding three month LIBOR + 2.68% TAYC Capital Trust II capital (preferred) securities were concurrently redeemed. The aggregate liquidation amount of these trust preferred securities was $40.0 million. TAYC Capital Trust II was established by Taylor Capital Group, Inc. ("Taylor Capital") prior to the Company's acquisition of Taylor Capital and the junior subordinated notes issued by Taylor Capital to TAYC Capital Trust II were assumed by the Company upon completion of the acquisition. As a result, the Company recognized a $5.9 million loss on extinguishment of debt in the third quarter of 2018.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Commitments: The Company is a party to credit-related financial instruments with off-balance-sheet risk in the normal course of business to meet the financing needs of its customers.  These financial instruments include commitments to extend credit, standby letters of credit, and commercial letters of credit.  Such commitments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the consolidated balance sheets.

The Company’s exposure to credit loss is represented by the contractual amount of these commitments.  The Company follows the same credit policies in making commitments as it does for on-balance-sheet instruments.

At September 30, 2018 and December 31, 2017, the following financial instruments were outstanding, the contractual amounts of which represent off-balance sheet credit risk (in thousands):

	Contractual Amount
	September 30, 2018		December 31, 2017
Commitments to extend credit:
Home equity lines	$	191,427	$	203,922
Other commitments	4,033,841		4,073,044
Letters of credit:
Standby	173,565		161,014
Commercial	1,564		2,248

Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract.  Commitments generally have fixed expiration dates or other termination clauses and may require a payment of a fee.  The commitments for home equity lines of credit may expire without being drawn upon.  Therefore, the total commitment amounts do not necessarily represent future cash requirements.  The amount of collateral obtained, if it is deemed necessary by the Company, is based on management’s credit evaluation of the customer.

The Company, in the normal course of its business, regularly offers standby and commercial letters of credit to its bank customers.  Standby and commercial letters of credit are a conditional but irrevocable form of guarantee.  Under letters of credit, the Company typically guarantees payment to a third party beneficiary upon the default of payment or nonperformance by the bank customer and upon receipt of complying documentation from that beneficiary.

Both standby and commercial letters of credit may be issued for any length of time, but normally do not exceed a period of five years.  These letters of credit may also be extended or amended from time to time depending on the bank customer’s needs.  As of September 30, 2018, the maximum remaining term for any standby letters of credit was December 31, 2025.  A fee is charged to the bank customer and is recognized as income over the life of the letter of credit, unless considered non-rebatable under the terms of a letter of credit application.

At September 30, 2018, the aggregate contractual amount of these letters of credit, which represents the maximum potential amount of future payments that the Company would be obligated to pay, increased$11.9 million to $175.1 million from $163.3 million at December 31, 2017.  Of the $175.1 million in commitments outstanding at September 30, 2018, approximately $116.7 million of the letters of credit have been issued or renewed since December 31, 2017.

Letters of credit issued on behalf of bank customers may be done on either a secured or unsecured basis.  If a letter credit is secured, the collateral can take various forms including bank accounts, investments, fixed assets, inventory, accounts receivable or real estate.  The Company takes the same care in making credit decisions and obtaining collateral when it issues letters of credit on behalf of its customers as it does when making other types of loans.

As of September 30, 2018, the Company had approximately $1.9 million in capital expenditure commitments outstanding which relate to various projects to renovate the corporate office space and branches.

Concentrations of credit risk:  As of September 30, 2018, approximately 20% of our investments in securities issued by states and political subdivisions were within the state of Illinois.  We did not hold any direct exposure to the state of Illinois as of September 30, 2018. Our commitments to extend credit are primarily related to commercial credits.  Standby and commercial letters of credit are granted primarily to commercial borrowers. Our asset-based loans are made to borrowers located throughout the United States. Lease banking provides banking services to lessors located throughout the United States. Our leasing subsidiaries originate leases to companies located throughout the United States. In addition, our indirect vehicle lenders originate loans to borrowers located throughout the United States.

Contingencies: In the normal course of business, the Company is involved in various legal proceedings.  In the opinion of management, any liability resulting from pending proceedings would not be expected to have a material adverse effect on the Company’s consolidated financial statements.

XML

Fair Value Measurements

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

ASC Topic 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability. The price in the principal (or most advantageous) market used to measure the fair value of the asset or liability shall not be adjusted for transaction costs. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets and liabilities; it is not a forced transaction. Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact and (iv) willing to transact.

ASC Topic 820 requires the use of valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets and liabilities. The income approach uses valuation techniques to convert expected future amounts, such as cash flows or earnings, to a single present value amount on a discounted basis. The cost approach is based on the amount that currently would be required to replace the service capacity of an asset (replacement cost). Valuation techniques should be consistently applied. Inputs to valuation techniques refer to the assumptions that market participants would use in pricing the asset or liability. Inputs may be observable, meaning those that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources, or unobservable, meaning those that reflect the reporting entity's own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. In that regard, ASC Topic 820 establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows:

Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date.

Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

Level 3: Significant unobservable inputs that reflect a reporting entity's own assumptions about the assumptions that market participants would use in pricing an asset or liability.

A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below.

In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality, the Company's creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. Our valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes the Company's valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally coincides with the Company's monthly and/or quarterly valuation process.

Financial Instruments Recorded at Fair Value on a Recurring Basis

Securities Available for Sale. The fair values of securities available for sale are determined by quoted prices in active markets, when available, and classified as Level 1. If quoted market prices are not available, the fair value is determined by matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities and classified as Level 2. In cases where significant credit valuation adjustments are incorporated into the estimation of fair value, reported amounts are classified as Level 3. The change in fair value is recorded through an adjustment to the statement of other comprehensive income.

Marketable Equity Securities. The fair values of marketable equity securities are determined by quoted prices in active markets, when available, and classified as Level 1. The change in fair value is recorded through an adjustment to the statement of operations.

Loans Held for Sale. Mortgage loans originated and held for sale in the secondary market are carried at fair value.The fair value of loans held for sale is determined using quoted secondary market prices and classified as Level 2. The change in fair value is recorded through an adjustment to the statement of operations.

Loans. The Company has elected to record certain mortgage loans at fair value. The fair value of these loans is determined using quoted secondary market prices and classified as Level 2. The change in fair value is recorded through an adjustment to the statement of operations.

Mortgage Servicing Rights. The Company has elected to record its mortgage servicing rights at fair value. Mortgage servicing rights do not trade in an active market with readily observable prices. Accordingly, the Company determines the fair value of mortgage servicing rights by estimating the fair value of the future cash flows associated with the mortgage loans being serviced. Key economic assumptions used in measuring the fair value of mortgage servicing rights include, but are not limited to, prepayment speeds, discount rates, delinquencies and cost to service. The assumptions used in the model are validated on a regular basis. The fair value is validated on a quarterly basis with an independent third party. Any material discrepancies between the internal model and the third party validation are investigated and resolved by an internal committee. Due to the nature of the valuation inputs, mortgage servicing rights are classified in Level 3 of the fair value hierarchy. The change in fair value is recorded through an adjustment to the statement of operations.

Assets Held in Trust for Deferred Compensation and Associated Liabilities.Assets held in trust for deferred compensation are recorded at fair value and included in “Other Assets” on the consolidated balance sheets. These assets are invested in mutual funds and classified as Level 1. Deferred compensation liabilities, also classified as Level 1, are carried at the fair value of the obligation to the employee, which corresponds to the fair value of the invested assets. The change in fair value is recorded through an adjustment to the statement of operations.

Derivatives. Currently, we use interest rate swaps to manage our interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative and classified as Level 2. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including LIBOR rate curves. The Company also obtains dealer quotations for these derivatives for comparative purposes to assess the reasonableness of the model valuations. In addition, the Company uses forward commitments to buy to-be-announced mortgage securities for which we do not intend to take delivery of the security and will enter into an offsetting position before physical delivery to lessen the price volatility of the mortgage servicing rights asset. Dealer quotations are used for these derivatives and are classified as Level 1. The Company also offers other derivatives, including foreign currency forward contracts and interest rate lock commitments, to our customers and offset our exposure from such contracts by purchasing other financial contracts, which are valued using market consensus prices. For certain interest rate lock commitments, the Company uses an external valuation model that relies on internally developed inputs to estimate the fair value of its interest rate lock commitments. This is based on unobservable inputs that reflect management’s assumptions and specific information about each borrower transaction and is classified in Level 3 of the hierarchy. The change in fair value is recorded through an adjustment to the statement of operations.

The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of September 30, 2018 and December 31, 2017, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands):

	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2018
Financial assets
Securities available for sale:
U.S Government sponsored agencies and enterprises	$	5,002	$	—	$	5,002	$	—
States and political subdivisions	343,256		—		342,927		329
Residential mortgage-backed securities	1,316,274		—		1,316,261		13
Commercial mortgage-backed securities	41,040		—		41,040		—
Corporate bonds	5,064		—		5,064		—
Marketable equity securities	10,901		10,901		—		—
Loans held for sale	51,834		—		51,834		—
Loans	42,363		—		42,363		—
Mortgage servicing rights	295,803		—		—		295,803
Assets held in trust for deferred compensation	25,605		25,605		—		—
Derivative financial instruments	58,196		198		57,998		—
Financial liabilities
Other liabilities (1)	25,605		25,605		—		—
Derivative financial instruments	59,309		351		58,726		232
December 31, 2017
Financial assets
Securities available for sale:
U.S. Government sponsored agencies and enterprises	$	23,007	$	—	$	23,007	$	—
States and political subdivisions	379,325		—		378,996		329
Residential mortgage-backed securities	852,699		—		852,665		34
Commercial mortgage-backed securities	72,035		—		72,035		—
Corporate bonds	70,197		—		70,197		—
Equity securities	11,063		11,063		—		—
Loans held for sale	548,578		—		548,578		—
Loans	40,531		—		40,531		—
Mortgage servicing rights	276,279		—		—		276,279
Assets held in trust for deferred compensation	21,410		21,410		—		—
Derivative financial instruments	31,499		389		29,539		1,571
Financial liabilities
Other liabilities (1)	21,410		21,410		—		—
Derivative financial instruments	40,296		1,072		39,224		—

⁽¹⁾  Liabilities associated with assets held in trust for deferred compensation

The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a recurring basis that were categorized within the Level 3 of the fair value hierarchy (fair value in thousands):

	Fair Value at
	September 30, 2018		Valuation Technique	Unobservable Input	Range
States and political subdivisions	$	329	Discounted cash flows	Credit assumption	40% - 45% Loss
Residential mortgage-backed securities	13		Discounted cash flows	Constant pre-payment rates (CPR)	1% - 3%
Mortgage servicing rights	295,803		Discounted cash flows	CPR	6.20% - 6.60%
				Discount rate	9.53 - 11.08
				Maturity (months)	327 - 358
				Delinquency rate	2.32 - 4.84
				Costs to service	$ 67 - $ 227
				Additive delinquent costs to service	$ 175 - $ 1,000
Derivative financial instruments (mortgage	—		Sales cash flows	Expected closing ratio	70% - 95%
interest rate lock commitments)				Expected delivery price	99.45 bps - 104.56 bps

	Fair Value at
	December 31, 2017		Valuation Technique	Unobservable Input	Range
States and political subdivisions	$	329	Discounted cash flows	Credit assumption	40-45% Loss
Residential mortgage-backed securities	34		Discounted cash flows	Constant pre-payment rates (CPR)	1% - 3%
Mortgage servicing rights	276,279		Discounted cash flows	CPR	6.7% - 7.8%
				Discount rate	9.53 - 11.06
				Maturity (months)	324 - 358
				Delinquency rate	2.42 - 5.30
				Costs to service	$ 67 - $ 227
				Additive delinquent costs to service	$ 175 - $ 1,000
Derivative financial instruments (mortgage	1,571		Sales cash flows	Expected closing ratio	70% - 95%
interest rate lock commitments)				Expected delivery price	97.38 bps - 106.87 bps

The significant unobservable inputs used in the fair value measurement of the Company’s mortgage servicing rights include prepayment speeds, discount rates, maturities, delinquencies and cost to service. Significant increases in prepayment speeds, discount rates, delinquencies or cost to service would result in a significantly lower fair value measurement. Conversely, significant decreases in prepayment speeds, discount rates, delinquencies or costs to service would result in a significantly higher fair value measurement. With the exception of changes in delinquencies, which can change the cost to service, the unobservable inputs move independently of each other.

Key economic assumptions used in the measuring of the fair value of the mortgage servicing rights and the sensitivity of the fair value to immediate adverse changes in those assumptions at September 30, 2018 are presented in the following table. This table does not take into account the derivatives used to economically hedge the mortgage servicing rights.

(dollars in thousands, except for weighted average cost to service)	September 30, 2018
Weighted average CPR	6.40		%
Impact on fair value of 10% adverse change	$	(8,430	)
Impact on fair value of 20% adverse change	(16,451		)
Weighted average discount rate	9.84		%
Impact on fair value of 10% adverse change	$	(12,623	)
Impact on fair value of 20% adverse change	(24,232		)
Weighted average delinquency rate	4.58		%
Impact on fair value of 10% adverse change	$	(3,098	)
Impact on fair value of 20% adverse change	(5,299		)
Weighted average costs to service	$	91.00
Impact on fair value of 10% adverse change	(5,475		)
Impact on fair value of 20% adverse change	(10,949		)

The Company did not have any transfers between Level 1 and Level 2 of the fair value hierarchy during the nine months endedSeptember 30, 2018. The Company's policy for determining transfers between levels occurs at the end of the reporting period when circumstances in the underlying valuation criteria change and result in transfer between levels.

The following table presents additional information about financial assets measured at fair value on a recurring basis for which the Company used significant unobservable inputs (Level 3):

	Nine Months Ended
	September 30,
	2018			2017			2018			2017			2018			2017
(in thousands)	Investment Securities						Mortgage Servicing Rights						Derivatives
Balance, beginning of period	$	363		$	544		$	276,279		$	238,011		$	1,571		$	3,160
Purchases	—			—			161			839			—			—
Originations	—			—			30,086			43,197			—			—
Included in earnings	—			—			(10,723		)	(20,601		)	(1,571		)	(1,221		)
Principal payments	(21		)	(106		)	—			—			—			—
Sales	—			—			—			—			—			—
Balance, ending of period	$	342		$	438		$	295,803		$	261,446		$	—		$	1,939

The Company had $232 thousand in financial liabilities measured at fair value on a recurring basis for which the Company used significant unobservable inputs (Level 3) at September 30, 2018. This financial liability relates to derivative financial instruments (mortgage interest rate lock commitments) that were added during the nine months ended September 30, 2018.

Financial Instruments Recorded at Fair Value on a Nonrecurring Basis

The Company may be required, from time to time, to measure certain financial assets and financial liabilities at fair value on a nonrecurring basis in accordance with U.S. GAAP. These include assets that are measured at the lower of cost or fair value that were recognized at fair value below cost at the end of the period.

Impaired Loans.Loans for which it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement are considered impaired. Once a loan is identified as individually impaired, management measures impairment in accordance with ASC Topic 310. The fair value of impaired loans is estimated using one of several methods, including collateral value, market value of similar debt, enterprise value, liquidation value, and discounted cash flows. Those impaired loans not requiring an allowance represent loans for which the fair value of the expected repayments or collateral exceed the recorded investments in such loans. In accordance with ASC Topic 820, impaired loans where an allowance is established based on the fair value of collateral require classification in the fair value hierarchy. Collateral values are estimated using Level 3 inputs based on customized discounting criteria. For a majority of impaired real estate loans where an allowance is established based on the fair value of collateral (100% at September 30, 2018), the Company obtains a current external appraisal. Other valuation techniques are used as well, including internal valuations, comparable property analysis and contractual sales information.

Non-Financial Assets and Non-Financial Liabilities Recorded at Fair Value

The Company has no non-financial assets or non-financial liabilities measured at fair value on a recurring basis. Certain non-financial assets and non-financial liabilities measured at fair value on a non-recurring basis include foreclosed assets and non-financial long-lived assets.

Other Real Estate and Repossessed Vehicles Owned (Foreclosed Assets). Foreclosed assets, upon initial recognition, are measured and reported at fair value through a charge-off to the allowance for loan and lease losses based upon the fair value of the foreclosed asset. The fair value of foreclosed assets, upon initial recognition, are estimated using Level 3 inputs based on customized discounting criteria.

Non-Financial Long-Lived Assets.  Non-financial long-lived assets, when determined to be impaired, are measured and reported at fair value using Level 3 inputs based on customized discounting criteria.

Assets measured at fair value on a nonrecurring basis as of September 30, 2018 and December 31, 2017 are included in the table below (in thousands):

	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2018
Financial assets:
Impaired loans	$	69,721	$	—	$	—	$	69,721
Non-financial assets:
Foreclosed assets	14,464		—		—		14,464
December 31, 2017
Financial assets:
Impaired loans	$	60,569	$	—	$	—	$	60,569
Non-financial assets:
Foreclosed assets	15,113		—		—		15,113

The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a nonrecurring basis that were categorized within the Level 3 of the fair value hierarchy (fair value in thousands):

	Fair Value at		Valuation
	September 30, 2018		Technique	Unobservable Input	Range
Impaired loans	$	69,721	Appraisal of collateral	Appraisal adjustments - sales costs	5% - 10%
Foreclosed assets	14,464		Appraisal of collateral	Appraisal adjustments - sales costs	5% - 10%

	Fair Value at		Valuation
	December 31, 2017		Technique	Unobservable Input	Range
Impaired loans	$	60,569	Appraisal of collateral	Appraisal adjustments - sales costs	5% - 10%
Foreclosed assets	15,113		Appraisal of collateral	Appraisal adjustments - sales costs	5% - 10%

ASC Topic 825 requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis. The methodologies for estimating the fair value of financial assets and financial liabilities that are measured at fair value on a recurring or non-recurring basis are discussed above. The estimated fair value approximates carrying value for cash and cash equivalents, accrued interest and the cash surrender value of life insurance policies. The methodologies for other financial assets and financial liabilities are discussed below:

The following methods and assumptions were used by the Company in estimating the fair values of its other financial instruments:

Cash and due from banks and interest earning deposits with banks: The carrying amounts reported in the balance sheet approximate fair value.

Securities held to maturity: The fair values of securities held to maturity are determined by quoted prices in active markets, when available, and classified as Level 1. If quoted market prices are not available, the fair value is determined by matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities and classified as Level 2. In cases where significant credit valuation adjustments are incorporated into the estimation of fair value, reported amounts are classified as Level 3.

Non-marketable securities - FHLB and FRB Stock: The carrying amounts reported in the balance sheet approximate fair value.

Loans: The fair values for loans are estimated using discounted cash flow analyses, using the corporate bond curve adjusted for liquidity for commercial loans and the swap curve adjusted for liquidity for retail loans, including increased interest rate spreads to incorporate a credit mark, estimating an exit price.

Non-interest bearing deposits: The fair values disclosed are equal to their balance sheet carrying amounts, which represent the amount payable on demand.

Interest bearing deposits: The fair values disclosed for deposits with no defined maturities are equal to their carrying amounts, which represent the amounts payable on demand. Fair values for certificates of deposit are estimated using a discounted cash flow calculation that applies the Company's current incremental borrowing rates for similar terms.

Short-term borrowings: The carrying amounts of federal funds purchased, borrowings under repurchase agreements and other short-term borrowings with maturities of 90 days or less approximate their fair values.  The fair value of short-term borrowings greater than 90 days is based on the discounted value of contractual cash flows.

Long-term borrowings: The fair values of the Company's long-term borrowings (other than deposits) are estimated using discounted cash flow analyses, based on the Company's current incremental borrowing rates for similar types of borrowing arrangements.

Junior subordinated notes issued to capital trusts: The fair values of the Company's junior subordinated notes issued to capital trusts are estimated based on the quoted market prices, when available, of the related trust preferred security instruments, or are estimated based on the quoted market prices of comparable trust preferred securities.

Accrued interest: The carrying amount of accrued interest receivable and payable approximate their fair values.

Off-balance-sheet instruments: Fair values for the Company’s off-balance-sheet lending commitments (guarantees, letters of credit and commitments to extend credit) are based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements.

The estimated fair values of financial instruments are as follows (in thousands):

	September 30, 2018
	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial Assets:
Cash and due from banks	$	342,933	$	342,933	$	342,933	$	—	$	—
Interest earning deposits with banks	87,740		87,740		87,740		—		—
Investment securities available for sale	1,710,636		1,710,636		—		1,710,294		342
Investment securities held to maturity	923,082		932,756		—		932,756		—
Marketable equity securities	10,901		10,901		10,901		—		—
Non-marketable securities - FHLB and FRB stock	107,407		107,407		—		—		107,407
Loans held for sale	51,834		51,834		—		51,834		—
Loans, net	13,779,541		13,836,445		—		42,362		13,794,083
Accrued interest receivable	66,122		66,122		66,122		—		—
Derivative financial instruments	58,196		58,196		198		57,998		—
Financial Liabilities:
Non-interest bearing deposits	$	6,036,012	$	6,036,012	$	6,036,012	$	—	$	—
Interest bearing deposits	8,672,781		8,659,683		—		—		8,659,683
Short-term borrowings	903,355		903,232		—		—		903,232
Long-term borrowings	451,677		451,620		—		—		451,620
Junior subordinated notes issued to capital trusts	133,995		108,394		—		—		108,394
Accrued interest payable	8,962		8,962		8,962		—		—
Derivative financial instruments	59,309		59,309		351		58,726		232

	December 31, 2017
	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial Assets:
Cash and due from banks	$	397,880	$	397,880	$	397,880	$	—	$	—
Interest earning deposits with banks	181,341		181,341		181,341		—		—
Investment securities available for sale	1,408,326		1,408,326		11,063		1,396,900		363
Investment securities held to maturity	959,082		992,455		—		992,455		—
Non-marketable securities - FHLB and FRB stock	114,111		114,111		—		—		114,111
Loans held for sale	548,578		548,578		—		548,578		—
Loans, net	13,808,352		13,988,392		—		40,531		13,947,861
Accrued interest receivable	63,589		63,589		63,589		—		—
Derivative financial instruments	31,499		31,499		389		29,539		1,571
Financial Liabilities:
Non-interest bearing deposits	$	6,381,512	$	6,381,512	$	6,381,512	$	—	$	—
Interest bearing deposits	8,576,866		8,569,368		—		—		8,569,368
Short-term borrowings	861,039		860,676		—		—		860,676
Long-term borrowings	505,158		513,725		—		—		513,725
Junior subordinated notes issued to capital trusts	211,494		170,965		—		—		170,965
Accrued interest payable	6,458		6,458		6,458		—		—
Derivative financial instruments	40,296		40,296		1,072		39,224		—

XML

Stock Incentive Plans

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Incentive Plans

Stock Incentive Plans

ASC Topic 718 requires that the grant date fair value of equity awards to employees be recognized as compensation expense over the period during which an employee is required to provide service in exchange for such award.

The following table summarizes the impact of the Company’s share-based payment plans in the financial statements for the periods shown (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Total compensation expense for share-based payment plans during the period	$	4,542	$	4,393	$	13,688	$	13,317
Amount of related income tax benefit recognized in income (1)	1,507		2,175		5,460		8,513

⁽¹⁾ Includes tax benefits recorded for the vesting of restricted shares and exercise of options.

The Company adopted the Omnibus Incentive Plan (the “Omnibus Plan”) in 1997.  On May 28, 2014, the Company’s stockholders approved the third amendment and restatement of the Omnibus Plan to add 3,100,000 authorized shares for a total of 11,400,000 shares of common stock authorized to be utilized in connection with awards under the Omnibus Plan to directors, officers, and employees of the Company or any of its subsidiaries. The number of shares authorized increased by 2,400,000 to 13,800,000 upon completion of the Taylor Capital merger.  Equity grants under the Omnibus Plan can be in the form of incentive stock options, non-qualified stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance units, and other stock-based awards.  Shares awarded in the form of restricted stock, restricted stock units, performance shares, performance units, or other stock-based awards generally will reduce the shares available under the Omnibus Plan on a 2-for-1 basis. No more than 10% of the total number of authorized shares may be issued with respect to awards granted after May 28, 2014, other than stock appreciation rights, stock options and performance-based awards, which at the date of grant are scheduled to fully vest prior to three years from the date of grant (although such awards may provide scheduled vesting earlier with respect to some of such shares and for acceleration of vesting as provided in the Omnibus Plan).  As of September 30, 2018, there were 2,131,433 shares available for future grants.

Annual equity-based incentive awards are generally granted to selected officers and employees in the first quarter of the year.  Options are granted with an exercise price equal to no less than the market price of the Company’s shares at the date of grant; those option awards generally vest over four years of service and have 10-year contractual terms.  Restricted shares and units typically vest over a two to four year period.  Equity awards may also be granted at other times throughout the year in connection with the recruitment and retention of officers and employees.  Directors currently may elect, in lieu of cash, to receive up to 70% of their fees in stock options with a five year term, which are fully vested on the grant date (provided that the director may not sell the underlying shares for at least six months after the grant date), and up to 100% of their fees in restricted shares, which vest one year after the grant date.

The following table summarizes changes in stock options for the nine months endedSeptember 30, 2018:

	Number of Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (In Years)	Aggregate Intrinsic Value (in thousands)
Options outstanding as of December 31, 2017	1,721,978		$	29.10	5.19
Granted	167,457		41.34
Exercised	(445,268	)	26.36
Expired	(2,293	)	33.08
Forfeited or cancelled	(24,031	)	30.56
Options outstanding as of September 30, 2018	1,417,843		$	31.37	5.92	$	20,908
Options exercisable as of September 30, 2018	928,013		$	28.46	4.78	$	16,393

The fair value of each option award is estimated on the date of grant using the Black-Scholes option pricing model based on certain assumptions.  Expected volatility is based on historical volatility and the expectations of future volatility of Company shares.  The risk free interest rate for periods within the contractual term of the option is based on the U.S. Treasury yield curve in effect at the time of the grant.  The expected life of options is estimated based on historical employee behavior and represents the period of time that options granted are expected to remain outstanding.

 The following assumptions were used for options granted during the nine months endedSeptember 30, 2018:

	September 30, 2018
Risk-free interest rate	2.80		%
Expected volatility of Company’s stock	25.90		%
Expected dividend yield	2.06		%
Expected life of options	5.7 years
Weighted average fair value per option of options granted during the year	$	9.45

The total intrinsic value of options exercised during the nine months endedSeptember 30, 2018 and 2017 was $9.7 million and $5.2 million, respectively.

The following is a summary of changes in restricted shares and units for the nine months endedSeptember 30, 2018:

	Number of Shares and Units		Weighted Average Grant Date Fair Value
Shares and units outstanding at December 31, 2017	973,201		$	37.03
Granted	427,939		41.66
Vested	(316,639	)	34.73
Forfeited or cancelled	(108,293	)	35.74
Shares and units outstanding at September 30, 2018	976,208		39.95

The total intrinsic value of restricted shares and units that vested during the nine months endedSeptember 30, 2018 and 2017 was $13.4 million and $17.4 million, respectively.

The Company awarded 71,567, 65,476, and 80,780 market-based restricted stock units in 2018, 2017, and 2016, respectively, which entitle recipients to shares of common stock at the end of a three year vesting period. Recipients will earn shares, totaling between 0% and 175% of the number of units issued, based on the Company's total stockholder return relative to a specified peer group of financial institutions over the three year period. The Company awarded 71,560 market-based restricted stock units in 2015 that vested in 2018. The threshold performance for the units granted in 2015 was not met and, as a result, no shares were issued. The market-based restricted stock units are included in the preceding table as if the recipients earned shares equal to 100% of the units issued. A Monte Carlo simulation model was used to value the market-based restricted stock units at the time awarded.

As of September 30, 2018, there was $26.1 million of total unrecognized compensation cost related to nonvested share-based compensation arrangements (including share option and nonvested share awards) granted under the Omnibus Plan.  At September 30, 2018, the weighted-average period over which the unrecognized compensation expense is expected to be recognized was approximately two years.

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Derivative Financial Instruments

9 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Derivative Financial Instruments

The Company offers various derivatives, including interest rate swaps and foreign currency forward contracts, to its qualifying customers which can mitigate our exposure to market risk through the execution of off-setting positions with inter-bank dealer counterparties. This also permits the Company to offer customized risk management solutions to our customers. These customer accommodations and any offsetting financial contracts are treated as non-designated derivative instruments and carried at fair value through an adjustment to the statement of operations.

Interest rate swap and foreign currency forward contracts involve the risk of dealing with counterparties and their ability to meet contractual terms. The net amount payable or receivable under interest rate swaps is accrued as an adjustment to interest income.  The net amount payable as of September 30, 2018 and December 31, 2017 was approximately $1 thousand.  The Company's credit exposure on interest rate swaps is limited to the Company's net favorable value and interest payments of all swaps to each counterparty. In such cases, collateral is generally required from the counterparties involved if the net value of the swaps exceeds a nominal amount.  At September 30, 2018, the Company’s credit exposure relating to interest rate swaps was approximately $17.7 million, which is secured by the underlying collateral on customer loans. 

The Company also enters into mortgage banking derivatives which are classified as non-designated hedging derivatives. These derivatives include interest rate lock commitments provided to customers to fund certain mortgage loans to be sold into the secondary market and forward commitments for the future delivery of such loans. It is the Company's practice to enter into forward commitments for the future delivery of residential mortgage loans when interest rate lock commitments are entered into in order to economically hedge the effect of future changes in interest rates on its commitments to fund the loans as well as on its portfolio of mortgage loans held-for-sale.

The Company had fair value commercial loan interest rate swaps, to hedge its interest rate risk, with an aggregate notional amount of $18 thousand at September 30, 2018.  For fair value hedges, the changes in fair values of both the hedging derivative and the hedged item were recorded in current earnings as other income.

Interest rate swaps, swaptions and treasury futures are used in order to lessen the price volatility of the mortgage servicing rights asset. The Company also uses forward commitments to buy to-be-announced ("TBA") mortgage securities for which the Company does not intend to take delivery of the security and will enter into an offsetting position before physical delivery to lessen the price volatility of the mortgage servicing rights asset. These derivatives are recorded at their fair value on the consolidated balance sheets in other assets with changes in fair value recorded on the consolidated statements of operations in mortgage banking revenue in non-interest income.

The Company’s derivative financial instruments are summarized below as of September 30, 2018 and December 31, 2017 (in thousands):

	Asset Derivatives								Liability Derivatives
	September 30, 2018				December 31, 2017				September 30, 2018					December 31, 2017
	Notional		Estimated		Notional		Estimated		Notional		Estimated			Notional		Estimated
	Amount		Fair Value		Amount		Fair Value		Amount		Fair Value			Amount		Fair Value
Derivative instruments designated as hedges of fair value:
Interest rate swap contracts (1)	$	—	$	—	$	—	$	—	$	18	$	(1	)	$	58	$	(1	)
Stand-alone derivative instruments: (2)
Interest rate swap contracts	1,713,998		38,624		1,563,109		21,217		1,713,998		(38,624		)	1,563,109		(21,217		)
Interest rate options contracts	506,760		4,324		372,927		1,887		506,760		(4,324		)	372,927		(1,887		)
Foreign exchange contracts	52,175		2,354		40,713		1,934		70,111		(2,298		)	34,029		(1,759		)
Spot foreign exchange contracts	13,036		35		1,424		23		3,119		(8		)	24		—
Mortgage related derivatives:
Interest rate swap contracts	225,000		12,661		458,000		4,479		275,000		(13,472		)	1,008,000		(14,360		)
Interest rate swaptions contracts	—		—		—		—		—		—			—		—
Treasury futures contracts	25,000		20		28,000		39		22,500		(88		)	30,000		(222		)
TBA mortgage securities	—		—		15,000		16		50,000		(250		)	100,000		(63		)
Forward loan sale commitments	35,800		178		259,000		333		9,500		(12		)	483,500		(787		)
Interest rate lock commitments	—		—		404,557		1,571		33,351		(232		)	—		—
Total stand-alone derivative instruments	2,571,769		58,196		3,142,730		31,499		2,684,339		(59,308		)	3,591,589		(40,295		)
Total	$	2,571,769	$	58,196	$	3,142,730	$	31,499	$	2,684,357	$	(59,309	)	$	3,591,647	$	(40,296	)

⁽¹⁾ Derivative instruments designated to hedge fixed-rate commercial real estate loans.

⁽²⁾ These portfolio swaps are not designated as hedging instruments under ASC Topic 815.

Amounts included in other operating income in the consolidated statements of operations related to derivative financial instruments were as follows (in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2018			2017			2018			2017
Derivative instruments designated as hedges of fair value:
Interest rate swap contracts	$	—		$	—		$	1		$	2
Stand-alone derivative instruments:
Interest rate swap contracts	617			3,276			4,245			6,749
Interest rate options contracts	—			—			—			—
Foreign exchange contracts	(83		)	(70		)	172			190
Spot foreign exchange contracts	723			629			2,340			2,036
Mortgage related derivatives	(1,630		)	(11,625		)	(3,083		)	(22,067		)
Total stand-alone derivative instruments	(373		)	(7,790		)	3,674			(13,092		)
Total	$	(373	)	$	(7,790	)	$	3,675		$	(13,090	)

Methods and assumptions used by the Company in estimating the fair value of its interest rate swaps are discussed in Note 12 to consolidated financial statements.

Certain instruments and transactions subject to an agreement similar to a master netting arrangement are eligible for offset in the consolidated balance sheet. The instruments and transactions would include derivatives, sale and repurchase agreements and reverse sale and repurchase agreements, and securities borrowing and securities lending arrangements. The Company’s derivative transactions with financial institution counterparties are generally executed under International Swaps and Derivative Association (“ISDA”) master agreements which include “right of set-off” provisions. Under these agreements, there is generally a legally enforceable right to offset recognized amounts, and there may be an intention to settle such amounts on a net basis. The Company, however, does not generally offset such financial instruments for financial reporting purposes.

Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of September 30, 2018 is summarized below (in thousands):

	Financial Assets						Financial Liabilities
	Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized		Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized
Derivatives:
Interest rate swap contracts, caps and floors	$	39,790	$	—	$	39,790	$	3,046	$	—	$	3,046
Foreign exchange contracts	700		—		700		1,802		—		1,802
Mortgage related derivatives	12,859		—		12,859		13,823		—		13,823
Total derivatives	53,349		—		53,349		18,671		—		18,671
Repurchase agreements	—		—		—		311,605		—		311,605
Total	$	53,349	$	—	$	53,349	$	330,276	$	—	$	330,276

	Financial Assets										Financial Liabilities
	Net Amount Recognized		Financial Instruments			Collateral			Net Amount		Net Amount Recognized		Financial Instruments			Collateral			Net Amount
Derivatives:
Counterparty A	$	10,830	$	(2,550	)	$	(8,253	)	$	27	$	2,550	$	(2,550	)	$	—		$	—
Counterparty B	4,084		(430		)	(3,471		)	183		430		(430		)	—			—
Counterparty C	2,280		—			(1,950		)	330		—		—			—			—
Other counterparties	36,155		(15,560		)	(1,752		)	18,843		15,691		(15,560		)	(1,875		)	(1,744		)
Total derivatives	53,349		(18,540		)	(15,426		)	19,383		18,671		(18,540		)	(1,875		)	(1,744		)
Repurchase agreements	—		—			—			—		311,605		—			(311,605		)	—
Total	$	53,349	$	(18,540	)	$	(15,426	)	$	19,383	$	330,276	$	(18,540	)	$	(313,480	)	$	(1,744	)

Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of December 31, 2017 is summarized below (in thousands):

	Financial Assets						Financial Liabilities
	Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized		Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized
Derivatives:
Interest rate swap contracts, caps and floors	$	11,659	$	—	$	11,659	$	11,562	$	—	$	11,562
Foreign exchange contracts	1,013		—		1,013		953		—		953
Mortgage related derivatives	4,868		—		4,868		15,432		—		15,432
Total derivatives	17,540		—		17,540		27,947		—		27,947
Repurchase agreements	—		—		—		232,789		—		232,789
Total	$	17,540	$	—	$	17,540	$	260,736	$	—	$	260,736

	Financial Assets									Financial Liabilities
	Net Amount Recognized		Financial Instruments			Collateral		Net Amount		Net Amount Recognized		Financial Instruments			Collateral			Net Amount
Derivatives:
Counterparty A	$	6,068	$	(6,068	)	$	—	$	—	$	13,807	$	(6,068	)	$	(7,739	)	$	—
Counterparty B	3,261		(3,261		)	—		—		5,595		(3,261		)	(2,334		)	—
Counterparty C	5,285		(3,640		)	—		1,645		3,640		(3,640		)	—			—
Other counterparties	2,926		(1,750		)	—		1,176		4,905		(1,750		)	(3,150		)	5
Total derivatives	17,540		(14,719		)	—		2,821		27,947		(14,719		)	(13,223		)	5
Repurchase agreements	—		—			—		—		232,789		—			(232,789		)	—
Total	$	17,540	$	(14,719	)	$	—	$	2,821	$	260,736	$	(14,719	)	$	(246,012	)	$	5

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Operating Segments

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Operating Segments

Operating Segments

The Company's operations currently consist of three reportable operating segments: Banking, Leasing, and Mortgage Banking. The Company offers different products and services through its three segments. The accounting policies of the segments are generally the same as those of the consolidated company.

The Banking Segment generates its revenues primarily from its lending, deposit gathering and fee business activities. The profitability of this segment's operations depends primarily on its net interest income after provision for credit losses, which is the difference between interest earned on interest earning assets and interest paid on interest bearing liabilities less provision for credit losses.  The provision for credit losses is almost entirely dependent on changes in the Banking Segment's loan portfolio and management’s assessment of the collectability of the loan portfolio as well as prevailing economic and market conditions.  The Banking Segment is also subject to an extensive system of laws and regulations that are intended primarily for the protection of depositors and other customers, federal deposit insurance funds and the banking system as a whole.  These laws and regulations govern such areas as capital, permissible activities, allowance for loan and lease losses, loans and investments, and rates of interest that can be charged on loans. 

The Leasing Segment generates its revenues through lease originations and related services. The Leasing Segment invests directly in equipment that the Company leases (referred to as direct finance, leveraged or operating leases) to "Fortune 1000," middle-market companies and health care providers located throughout the United States. The lease portfolio is made up of various kinds of equipment, generally technology related, such as computer systems, satellite equipment, medical equipment and general manufacturing, industrial, construction and transportation equipment. The Leasing Segment also specializes in selling third party equipment maintenance contracts to large companies.

The Mortgage Banking Segment originates residential mortgage loans for sale to investors and for the Company's portfolio through its retail and third party originator channels. This segment also services residential mortgage loans for various investors and for loans owned by the Company. The Mortgage Banking Segment is subject to an extensive system of laws and regulations that are intended primarily for the protection of customers. On April 12, 2018, the Company announced the discontinuation of its national mortgage origination business, which includes substantially all originations outside of the Company's consumer banking footprint in the Chicagoland area. The Company is retaining the mortgage servicing asset, residential mortgage loans, and Chicagoland area originations. The Company expects to stop operating its mortgage business as a defined segment with separate Mortgage Banking Segment reporting in 2019.

Net interest income for the Leasing and Mortgage Banking segments include adjustments based on the Company's internal funds transfer pricing model. Non-interest income for the Leasing Segment includes income on loans originated for the sole purpose of funding equipment purchases related to leases at the Company's lease subsidiaries.

The following tables present summary financial information for the reportable segments (in thousands):

	Banking		Leasing		Mortgage Banking			Consolidated
Three months ended September 30, 2018
Net interest income	$	152,003	$	2,160	$	7,685		$	161,848
Provision for credit losses	21,439		90		(26		)	21,503
Non-interest income	46,750		23,157		9,934			79,841
Non-interest expense (1)	126,979		15,611		25,954			168,544
Income tax expense	8,671		2,480		(2,223		)	8,928
Net income	$	41,664	$	7,136	$	(6,086	)	$	42,714
Total assets	$	16,677,552	$	1,340,901	$	1,701,518		$	19,719,971
Three months ended September 30, 2017
Net interest income	$	142,888	$	2,686	$	11,373		$	156,947
Provision for credit losses	3,637		399		481			4,517
Non-interest income	45,128		22,560		28,243			95,931
Non-interest expense (1)	113,014		14,498		35,449			162,961
Income tax expense	18,781		4,307		1,469			24,557
Net income	$	52,584	$	6,042	$	2,217		$	60,843
Total assets	$	16,406,714	$	1,307,459	$	2,402,362		$	20,116,535

⁽¹⁾  Includes merger related and repositioning expenses of $4.2 million and $9.8 million in the Banking and Mortgage Banking Segment, respectively, for the three months ended September 30, 2018 and $1.6 million in the Banking Segment for the three months ended September 30, 2017.

	Banking		Leasing		Mortgage Banking			Consolidated
Nine months ended September 30, 2018
Net interest income	$	439,088	$	6,991	$	28,219		$	474,298
Provision for credit losses	34,764		566		(100		)	35,230
Non-interest income	136,558		70,664		53,727			260,949
Non-interest expense (1)	367,489		46,319		115,614			529,422
Income tax expense	37,288		4,288		(8,985		)	32,591
Net income	$	136,105	$	26,482	$	(24,583	)	$	138,004
Total assets	$	16,677,552	$	1,340,901	$	1,701,518		$	19,719,971
Nine months ended September 30, 2017
Net interest income	$	410,319	$	7,300	$	31,365		$	448,984
Provision for credit losses	16,054		674		1,222			17,950
Non-interest income	130,564		62,136		86,851			279,551
Non-interest expense (1)	337,289		41,711		106,515			485,515
Income tax expense	50,103		10,951		4,170			65,224
Net income	$	137,437	$	16,100	$	6,309		$	159,846
Total assets	$	16,406,714	$	1,307,459	$	2,402,362		$	20,116,535

⁽¹⁾  Includes merger related and repositioning expenses of $9.6 million and $29.9 million in the Banking and Mortgage Banking Segment, respectively, for the nine months endedSeptember 30, 2018 and $9.0 million in the Banking Segment for the nine months endedSeptember 30, 2017.

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Preferred Stock

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Preferred Stock

Preferred Stock

On August 18, 2014, in connection with the Taylor Capital merger, the Company issued one share of its Perpetual Non-Cumulative Preferred Stock, Series A (“Company Series A Preferred Stock”), in exchange for each of the 4,000,000 outstanding shares of Taylor Capital’s Perpetual Non-Cumulative Preferred Stock, Series A. Holders of the Company Series A Preferred Stock were entitled to receive, when as and if declared by the Company’s board of directors, non-cumulative cash dividends on the liquidation preference amount, which was $25 per share, at a rate of 8.00% per annum, payable quarterly. The Company Series A Preferred Stock was included in Tier 1 capital for regulatory capital purposes. On February 15, 2018, the Company redeemed all of the 4,000,000 issued and outstanding shares of Company Series A Preferred Stock at a redemption price of $25.00 per share, or $100.0 million in the aggregate. The excess carrying amount of the Series A Preferred Stock in the amount of $15.3 million was retained in stockholders' equity and reflected as income available to common stockholders, which was included in the calculation of earnings per common share for the nine months ended September 30, 2018.

On November 22, 2017, the Company issued8,000,000depositary shares, each representing a 1/40th interest in a share of itsNon-Cumulative Preferred Stock, Series C (“Company Series C Preferred Stock”). Holders of the Company Series C Preferred Stock are entitled to receive, when as and if declared by the Company's board of directors, non-cumulative cash dividends on the liquidation preference, which is $25 per depositary share (equivalent to $1,000 per share of preferred stock), at a rate of 6.00% per annum, payable quarterly. The Company Series C Preferred Stock is included in Tier 1 capital for regulatory capital purposes and is redeemable at the option of the Company at a redemption price of $25 per depositary share, plus any declared and unpaid dividends, (i) in whole or in part from time to time, on any dividend payment date on or after November 25, 2022, and (ii) in whole but not in part prior to November 25, 2022, within 90 days following a “regulatory capital treatment event,” as defined in the terms of the Company Series C Preferred Stock. The Company must receive the approval of the Federal Reserve Board prior to any redemption of the Company Series C Preferred Stock.

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Definitive Merger Agreement

9 Months Ended

Sep. 30, 2018

Business Combinations [Abstract]

Definitive Merger Agreement

Definitive Merger Agreement

On May 20, 2018, the Company entered into an Agreement and Plan of Merger (the "Merger Agreement") with Fifth Third Bancorp, an Ohio corporation ("Fifth Third"), pursuant to which a newly formed subsidiary of Fifth Third will be merged with and into the Company, with the Company as the surviving corporation (the “Merger”).

At the effective time of the Merger (the "Effective Time"), each outstanding share of Company Common Stock will be converted into the right to receive (i) 1.45 shares of Fifth Third common stock ("Fifth Third Common Stock"), and (ii) $5.54 in cash (collectively, the "Merger Consideration"). The Company’s Series C Preferred Stock will remain outstanding and unchanged (except as modified by the Charter Amendment) as preferred stock of the Company, which will be a subsidiary of Fifth Third.

Pursuant to an amendment to the Company's charter (the "Charter Amendment"), effective immediately prior to consummation of the Merger, the holders of Company Series C Preferred Stock will have the right to vote with the holders of Company Common Stock as a single class on all matters submitted to a vote of such common stockholders. Upon completion of the Merger, Fifth Third, as the sole holder of Company Common Stock, will control the Company. Following completion of the Merger, the holders of Company Series C Preferred Stock will vote with Fifth Third as a single class on all matters submitted to a vote of Fifth Third, as the sole common stockholder of the Company. Thus, the voting rights that will be conferred upon the holders of Company Series C Preferred Stock by the Charter Amendment will continue to apply with respect to the Company, and not Fifth Third, following completion of the Merger.

At the Effective Time, each option granted by the Company to purchase shares of Company Common Stock (the "Company Options") will be converted into an option to purchase shares of Fifth Third Common Stock on the same terms and conditions as were applicable to such Company Options prior to the Merger, subject to certain adjustments to the exercise price and the number of shares of Fifth Third Common Stock issuable upon exercise of such option in accordance with the Merger Agreement. In addition, each Company restricted stock award, restricted stock unit and performance-based award (the "Company Equity Awards") that remains unvested and would not automatically vest by its terms at the Effective Time will be assumed by Fifth Third and converted into a number of shares of Fifth Third Common Stock (the "Assumed Equity Awards") with such shares being subject to certain adjustments in accordance with the Merger Agreement but otherwise remaining subject to the same terms and conditions as applicable immediately prior to such conversion. Each Company Equity Award that is outstanding immediately prior to the Effective Time that is not assumed under the Merger Agreement will be canceled and converted automatically into the right to receive the Merger Consideration.

On September 18, 2018, the Company received the requisite approvals of its common stockholders for the Merger. The Merger is subject to regulatory approvals and certain other customary closing conditions.

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Subsequent Events Subsequent Events

9 Months Ended

Sep. 30, 2018

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

On October 7, 2018, the Company redeemed the junior subordinated notes held by American Chartered Statutory Trust II and, as a result, all of the issued and outstanding three month LIBOR + 2.75% American Chartered Statutory Trust II capital (preferred) securities were concurrently redeemed. The aggregate liquidation amount of these trust preferred securities was $10.0 million.

On October 23, 2018, the Company redeemed the junior subordinated notes held by FOBB Statutory Trust III and, as a result, all of the issued and outstanding three month LIBOR + 2.80% FOBB Statutory Trust III capital (preferred) securities were concurrently redeemed. The aggregate liquidation amount of these trust preferred securities was $5.0 million.

For additional information regarding these securities, see Note 10. Junior Subordinated Notes Issued to Capital Trusts.

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New Authoritative Accounting Guidance (Policies)

9 Months Ended

Sep. 30, 2018

Accounting Changes and Error Corrections [Abstract]

New Authoritative Accounting Guidance

ASC Topic 805 "Business Combinations." New authoritative accounting guidance under ASC Topic 805 "Business Combinations" amends prior guidance to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 606 "Revenue from Contracts with Customers." New authoritative accounting guidance under ASC Topic 606, "Revenue from Contracts with Customers" amended prior guidance to require an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The new authoritative guidance was initially effective for reporting periods after January 1, 2017 but was deferred to January 1, 2018. The Company's revenue is comprised of interest income on financial assets, which is excluded from the scope of this new guidance, and non-interest income. This new guidance changes how certain recurring revenue streams are recognized within lease financing revenue and insignificant components of non-interest income. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition. See "Accounting changes" below.

ASC Topic 825 "Financial Instruments." New authoritative accounting guidance under ASC Topic 825 "Financial Instruments" amended prior guidance to require equity investments (except those accounted for under the equity method of accounting) to be measured at fair value with changes in fair value recognized in net income. An entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer. The new guidance simplifies the impairment assessment of equity investments without readily determinable fair values, requires public entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from changes in the instrument-specific credit risk when the entity has selected the fair value option for financial instruments and requires separate presentation of financial assets and liabilities by measurement category and form of financial asset. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition. See "Accounting changes" below.

ASC Topic 405 "Liabilities-Extinguishment of Liabilities." New authoritative accounting guidance under ASC Topic 405, "Liabilities-Extinguishment of Liabilities" amended prior guidance to clarify that liabilities related to the sale of prepaid store-value products within the scope of this guidance are financial liabilities and that breakage for those liabilities are to be accounted for consistent with the breakage guidance in ASC Topic 606 "Revenue from Contracts with Customers." The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 842 "Leases." New authoritative accounting guidance under ASC Topic 842 "Leases" amended prior guidance to require lessees to recognize the assets and liabilities arising from all leases on the balance sheet. The new authoritative guidance defines a lease as a contract, or part of a contract, that conveys the right to control the use of identified property, plant, or equipment (an identified asset) for a period of time in exchange for consideration. In addition, the qualifications for a sale and leaseback transaction have been amended. The new authoritative guidance also requires qualitative and quantitative disclosures bylessees and lessors to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The new authoritative guidance will be effective for reporting periods after January 1, 2019. In July 2018, the Financial Accounting Standards Board issued new authoritative guidance to provide an additional transition method that allows entities to not apply this new guidance in the comparative periods presented in the financial statements and instead recognize a cumulative effect adjustment to the beginning retained earnings at the date of application. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition. The Company expects an increase in assets and liabilities as a result of recording additional lease contracts where the Company is lessee and expects to adopt the new guidance prospectively as of January 1, 2019 and to not restate comparative periods.

ASC Topic 815 "Derivatives and Hedging." New authoritative accounting guidance under ASC Topic 815 "Derivatives and Hedging" amended prior guidance to better align an entity's risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. The new authoritative guidance expands and refines hedge accounting for both nonfinancial and financial risk components. The new authoritative guidance will be effective for reporting periods after January 1, 2019 with early adoption permitted. In October 2018, the Financial Accounting Standards Board issued new authoritative guidance to permit the use of the Overnight Index Swap rate based on Secured Overnight Financing Rate as a U.S. benchmark interest rate for hedge accounting purposes. This new authoritative guidance is not expected to have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 718 "Compensation - Stock Compensation." New authoritative accounting guidance under ASC Topic 718 "Compensation - Stock Compensation" amends prior guidance by clarifying which changes to terms or conditions of a share-based payment award require an entity to apply modification accounting. An entity should account for the effects of a modification unless the fair value, vesting conditions and classification of the modified award are the same as the original award. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 326 "Financial Instruments - Credit Losses." New authoritative accounting guidance under ASC Topic 326 "Financial Instruments - Credit Losses" amended the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information for credit loss estimates. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The new authoritative guidance also requires a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected (net of the allowance for credit losses). In addition, the credit losses relating to available-for-sale debt securities should be recorded through an allowance for credit losses rather than a write-down. The new authoritative guidance will be effective for reporting periods after January 1, 2020. The Company is evaluating the new guidance and expects it to have an impact on the Company's statements of operations and financial condition, the significance of which is not yet known nor can it be reasonably estimated currently. Due to the significant differences in the new authoritative guidance from existing GAAP, the implementation of this guidance may result in material changes in our accounting for credit losses on financial instruments and will be impacted by the Company's loan and securities portfolios' composition, attributes, and quality in addition to prevailing economic conditions and forecasts at the time of adoption. As part of the Company's evaluation process, it had established a steering committee and working group, including individuals from various functional areas, to assess processes and related controls, portfolio segmentation, model development, system requirements, and needed resources, however, due to the pending merger with Fifth Third Bancorp, the Company has changed its evaluation process to incorporate the transition of the Company's assets to Fifth Third Bancorp.

ASC Topic 230 "Statement of Cash Flows." New authoritative accounting guidance under ASC Topic 230 "Statement of Cash Flows" addresses eight specific cash flow classification issues with the objective of reducing the existing diversity in practice. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

New authoritative accounting guidance under ASC Topic 230 "Statement of Cash Flows" amends prior guidance to require an entity to include amounts generally described as restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning of period and end of period total amounts shown on the statement of cash flows. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 740 "Income Taxes." New authoritative accounting guidance under ASC Topic 740 "Income Taxes" amends prior guidance to require an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 350 "Intangibles-Goodwill and Other." New authoritative accounting guidance under ASC Topic 350 "Intangibles-Goodwill and Other" amends prior guidance to eliminate Step 2 from the goodwill impairment test and require an entity to perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new authoritative guidance will be effective for reporting periods after January 1, 2020. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition.

ASC Topic 610 "Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets." New authoritative accounting guidance under ASC Topic 610 "Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets" amends prior guidance to clarify the scope of Subtopic 610-20 by defining in substance nonfinancial assets and to add guidance for partial sales of nonfinancial assets. The Company adopted this new authoritative guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition.

ASC Topic 310 "Receivables - Nonrefundable Fees and Other Costs." New authoritative accounting guidance under ASC Topic 310 "Receivables - Nonrefundable Fees and Other Costs" amends prior guidance by shortening the amortization period for certain callable debt securities held at a premium requiring the premium to be amortized to the earliest call date. The new authoritative guidance will be effective for reporting periods after January 1, 2019 with early adoption permitted. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition.

ASC Topic 220 "Income Statement - Reporting Comprehensive Income." New authoritative accounting guidance under ASC Topic 220 "Income Statement - Reporting Comprehensive Income" allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from enactment of H.R. 1, originally known as the "Tax Cuts and Jobs Act." The new authoritative guidance will be effective for reporting periods after January 1, 2019 with early adoption permitted. The Company early adopted the new guidance on January 1, 2018, and it did not have a significant impact on the Company's statements of operations or financial condition. See "Accounting changes" below.

ASC Topic 820 "Fair Value Measurement." New authoritative accounting guidance under ASC Topic 820 "Fair Value Measurement" amends prior guidance to modify the disclosure requirements. The new authoritative guidance removes the requirement to disclose the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, the policy for timing of transfers between levels, the valuation processes for Level 3 fair value measurements. It also adds the requirement to disclose the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. The new authoritative guidance will be effective for reporting periods after January 1, 2020 with early adoption permitted. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition.

Accounting changes. The Company adopted the new authoritative accounting guidance under ASC Topic 606, "Revenue from Contracts with Customers" on January 1, 2018 using the modified retrospective transition method for contracts that were not completed at the date of initial application. The Company recognized a cumulative effect reduction to the beginning retained earnings totaling $683 thousand. This amount relates to lease financing revenue where the Company's performance obligation is over time. Previously, such revenue was recognized immediately. See "Lease financing revenue, net" below.

The new authoritative accounting guidance under ASC Topic 606 requires an entity to recognize revenue in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. To achieve this, the Company takes the following steps: identify the contract(s) with a customer; identify the performance obligations in the contract; determine the transaction price; allocate the transaction price to the performance obligations in the contract; and recognize revenue when (or as) the Company satisfies a performance obligation. The non-interest revenue streams that are considered to be in the scope of this new guidance are discussed below.

Lease financing revenue, net. Fees from the sale of third-party equipment maintenance contracts are included within lease financing revenue, net. The Company sells third-party equipment maintenance contracts and provides customers with an asset and maintenance contract management tool over the life of the maintenance contract. Since the Company provides support for the asset and maintenance contract management tool, the Company's performance obligation is satisfied over the life of the maintenance contract, and the fees are recognized monthly over the life of the maintenance contract. Payment is typically received at the time of sale of the maintenance contract.

Treasury management fees and consumer and other deposit service fees. Deposit related fees (account analysis fees, monthly service fees, and other related fees) are included within treasury management fees and consumer and other deposit service fees. The Company's performance obligation is ongoing and either party may cancel at any time. These fees are generally recognized as the services are rendered on a monthly basis. Payment is typically received monthly.

Wealth management fees. Wealth management fees include revenue from the management and advisement of client assets and trust administration. The Company's performance obligation is generally satisfied over time, and the fees are recognized monthly. Payment is typically received quarterly or annually.

Card fees. Card fees include debit and credit card interchange fees and ATM fees. For debit and credit card transactions, the Company considers the merchant as the customer for interchange revenue with the performance obligation being satisfied when the cardholder purchases goods or services from the merchant. Interchange revenue is recognized as the services are provided. The Company's performance obligation for ATM fees is satisfied when services are provided, and the fees are recognized at that time. Payment is typically received immediately or in the following month.

Capital markets and international banking fees. Capital markets and international banking fees include M&A advisory and syndication fees. The Company's performance obligation is generally satisfied over time, and the fees are recognized monthly. For M&A advisory fees, a portion of the payment is received at the beginning of the engagement with the remainder received once the transaction is completed. For syndication fees, payment is received annually.

The Company also adopted the new authoritative accounting guidance under ASC Topic 825 "Financial Instruments" and ASC Topic 220 "Income Statement - Reporting Comprehensive Income" on January 1, 2018. The Company recognized a cumulative effect increase to the beginning retained earnings and accumulated other comprehensive income totaling $385 thousand under ASC Topic 825 representing the fair value adjustment to equity securities at the date of initial application. In addition, the Company reclassified $729 thousand from accumulated other comprehensive loss to retained earnings for the stranded tax effects resulting from enactment of the Tax Cuts and Jobs Act at the date of initial application of the new guidance under ASC Topic 220.

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Earnings Per Common Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Reconciliation of the Number of Shares Used in the Calculation of Basic and Diluted Earnings Per Common Share

The following table presents a reconciliation of the number of shares used in the calculation of basic and diluted earnings per common share (amounts in thousands, except share and per share data).

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Distributed earnings allocated to common stock	$	20,468	$	17,823	$	61,223	$	51,783
Undistributed earnings	22,246		43,020		76,781		108,063
Net income	42,714		60,843		138,004		159,846
Less: preferred stock dividends	3,000		2,002		9,100		6,007
Plus: return from preferred stockholders due to redemption (1)	—		—		15,280		—
Net income available to common stockholders for basic earnings per common share	39,714		58,841		144,184		153,839
Plus: preferred stock dividends on convertible preferred stock	—		2		—		7
Less: earnings allocated to participating securities	1		1		4		3
Earnings allocated to common stockholders for diluted earnings per common share	$	39,713	$	58,842	$	144,180	$	153,843
Weighted average shares outstanding for basic earnings per common share	84,369,519		83,891,175		84,230,835		83,799,694
Dilutive effect of:
Stock options	463,024		502,794		508,270		564,541
Restricted shares and units	502,566		379,684		423,115		404,850
Convertible preferred stock	—		6,144		—		6,867
Total dilutive effect of equity awards and convertible preferred stock	965,590		888,622		931,385		976,258
Weighted average shares outstanding for diluted earnings per common share	85,335,109		84,779,797		85,162,220		84,775,952
Basic earnings per common share	$	0.47	$	0.70	$	1.71	$	1.84
Diluted earnings per common share	0.47		0.69		1.69		1.81

⁽¹⁾  Represents the excess carrying amount over the redemption price of the 8% Series A non-cumulative perpetual preferred stock redeemed in the first quarter of 2018.

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Investment Securities (Tables)

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Summary of Amortized Cost and Fair Value of Investment Securities

Amortized cost and fair value of investment securities, excluding marketable equity securities and non-marketable FHLB and FRB stock, were as follows as of the dates indicated (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
September 30, 2018
Available for Sale
U.S. Government sponsored agencies and enterprises	$	5,087	$	—	$	(85	)	$	5,002
States and political subdivisions	335,034		8,928		(706		)	343,256
Residential mortgage-backed securities	1,344,270		1,209		(29,205		)	1,316,274
Commercial mortgage-backed securities	41,070		62		(92		)	41,040
Corporate bonds	5,065		—		(1		)	5,064
Total Available for Sale	1,730,526		10,199		(30,089		)	1,710,636
Held to Maturity
States and political subdivisions	899,865		12,991		(3,562		)	909,294
Residential mortgage-backed securities	23,217		245		—			23,462
Total Held to Maturity	923,082		13,236		(3,562		)	932,756
Total	$	2,653,608	$	23,435	$	(33,651	)	$	2,643,392
December 31, 2017
Available for Sale
U.S. Government sponsored agencies and enterprises	$	23,013	$	3	$	(9	)	$	23,007
States and political subdivisions	363,813		15,998		(486		)	379,325
Residential mortgage-backed securities	861,594		3,035		(11,930		)	852,699
Commercial mortgage-backed securities	71,554		612		(131		)	72,035
Corporate bonds	70,155		84		(42		)	70,197
Equity securities (1)	11,236		—		(173		)	11,063
Total Available for Sale	1,401,365		19,732		(12,771		)	1,408,326
Held to Maturity
States and political subdivisions	878,400		32,559		(447		)	910,512
Residential mortgage-backed securities	80,682		1,261		—			81,943
Total Held to Maturity	959,082		33,820		(447		)	992,455
Total	$	2,360,447	$	53,552	$	(13,218	)	$	2,400,781

⁽¹⁾  Reflected in marketable equity securities on the consolidated balance sheet following the adoption of the new guidance under ASC Topic 825 "Financial Instruments" on January 1, 2018.

Unrealized Losses on Investment Securities and the Fair Value of the Related Securities

Unrealized losses on investment securities by length of time in a continuous unrealized loss position and the fair value of the related securities at September 30, 2018 were as follows (in thousands):

	Less Than 12 Months					12 Months or More					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
	Value		Losses			Value		Losses			Value		Losses
Available for Sale
U.S. Government sponsored agencies and enterprises	$	5,002	$	(85	)	$	—	$	—		$	5,002	$	(85	)
States and political subdivisions	27,107		(140		)	18,453		(566		)	45,560		(706		)
Residential mortgage-backed securities	765,346		(11,848		)	411,324		(17,357		)	1,176,670		(29,205		)
Commercial mortgage-backed securities	16,989		(46		)	11,713		(46		)	28,702		(92		)
Corporate bonds	5,064		(1		)	—		—			5,064		(1		)
Total Available for Sale	819,508		(12,120		)	441,490		(17,969		)	1,260,998		(30,089		)
Held to Maturity
States and political subdivisions	289,842		(2,824		)	16,463		(738		)	306,305		(3,562		)
Total	$	1,109,350	$	(14,944	)	$	457,953	$	(18,707	)	$	1,567,303	$	(33,651	)

Unrealized losses on investment securities by length of time in a continuous unrealized loss position and the fair value of the related securities at December 31, 2017 were as follows (in thousands):

	Less Than 12 Months					12 Months or More					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
	Value		Losses			Value		Losses			Value		Losses
Available for Sale
U.S. Government sponsored agencies and enterprises	$	5,111	$	(9	)	$	—	$	—		$	5,111	$	(9	)
States and political subdivisions	9,016		(29		)	18,754		(457		)	27,770		(486		)
Residential mortgage-backed securities	256,769		(1,853		)	407,224		(10,077		)	663,993		(11,930		)
Commercial mortgage-backed securities	19,483		(20		)	14,583		(111		)	34,066		(131		)
Corporate bonds	7,052		(8		)	9,963		(34		)	17,015		(42		)
Equity securities	11,063		(173		)	—		—			11,063		(173		)
Total Available for Sale	308,494		(2,092		)	450,524		(10,679		)	759,018		(12,771		)
Held to Maturity
States and political subdivisions	45,499		(257		)	12,561		(190		)	58,060		(447		)
Total	$	353,993	$	(2,349	)	$	463,085	$	(10,869	)	$	817,078	$	(13,218	)

Summary of Net Gains (Losses) on Investment Securities Available for Sale

Net gains (losses) recognized on investment securities were as follows (in thousands):

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2018			2017		2018			2017
Realized gains	$	42		$	83	$	192		$	457
Realized losses	(127		)	—		(537		)	(6		)
Net (losses) gains	$	(85	)	$	83	$	(345	)	$	451

Amortized Cost and Fair Value of Investment Securities by Contractual Maturity

The amortized cost and fair value of investment securities as of September 30, 2018 by contractual maturity are shown below. Maturities may differ from contractual maturities in mortgage-backed securities because the mortgages underlying the securities may be called or repaid without any penalties. Therefore, mortgage-backed securities are not included in the maturity categories in the following maturity summary.

	Amortized		Fair
(In thousands)	Cost		Value
Available for sale:
Due in one year or less	$	44,036	$	44,350
Due after one year through five years	128,692		131,525
Due after five years through ten years	39,263		39,458
Due after ten years	133,195		137,989
Residential and commercial mortgage-backed securities	1,385,340		1,357,314
	1,730,526		1,710,636
Held to maturity:
Due in one year or less	66,747		67,040
Due after one year through five years	150,122		154,149
Due after five years through ten years	230,783		234,855
Due after ten years	452,213		453,250
Residential mortgage-backed securities	23,217		23,462
	923,082		932,756
Total	$	2,653,608	$	2,643,392

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Loans (Tables)

9 Months Ended

Sep. 30, 2018

Receivables [Abstract]

Schedule of Composition of Loans

Loans consist of the following at (in thousands):

	September 30, 2018		December 31, 2017
Commercial loans	$	4,936,536	$	4,786,180
Commercial loans collateralized by assignment of lease payments	2,065,588		2,113,135
Commercial real estate	3,832,032		4,147,529
Residential real estate	1,403,087		1,432,458
Construction real estate	548,882		406,849
Indirect vehicle	790,573		667,928
Home equity	181,477		219,098
Other consumer loans	85,705		73,141
Total loans, excluding purchased credit-impaired loans	13,843,880		13,846,318
Purchased credit-impaired loans	91,072		119,744
Total loans	$	13,934,952	$	13,966,062

Contractual Aging of the Recorded Investment in Past Due Loans by Class of Loans

The following table presents the contractual aging of the recorded investment in past due loans by class of loans as of September 30, 2018 and December 31, 2017 (in thousands):

	Current		30-59 Days Past Due		60-89 Days Past Due		Loans Past Due 90 Days or More		Total Past Due		Total
September 30, 2018
Commercial	$	4,927,393	$	3,487	$	1,077	$	4,579	$	9,143	$	4,936,536
Commercial collateralized by assignment of lease payments	2,032,510		29,858		2,458		762		33,078		2,065,588
Commercial real estate:
Health care	664,187		269		—		—		269		664,456
Industrial	865,914		—		—		2,811		2,811		868,725
Multifamily	503,597		128		—		529		657		504,254
Retail	479,167		413		—		819		1,232		480,399
Office	418,330		—		—		120		120		418,450
Other	887,428		2,547		175		5,598		8,320		895,748
Residential real estate	1,388,338		659		2,610		11,480		14,749		1,403,087
Construction real estate	548,882		—		—		—		—		548,882
Indirect vehicle	783,161		4,747		1,847		818		7,412		790,573
Home equity	175,747		2,650		836		2,244		5,730		181,477
Other consumer	85,284		169		113		139		421		85,705
Total loans, excluding purchased credit-impaired loans	13,759,938		44,927		9,116		29,899		83,942		13,843,880
Purchased credit-impaired loans	53,843		2,809		3,904		30,516		37,229		91,072
Total loans	$	13,813,781	$	47,736	$	13,020	$	60,415	$	121,171	$	13,934,952
Non-performing loan aging	$	39,737	$	2,932	$	1,163	$	29,899	$	33,994	$	73,731
December 31, 2017
Commercial	$	4,769,244	$	1,702	$	6,926	$	8,308	$	16,936	$	4,786,180
Commercial collateralized by assignment of lease payments	2,099,246		11,320		1,878		691		13,889		2,113,135
Commercial real estate:
Health care	710,722		—		—		—		—		710,722
Industrial	908,394		—		—		755		755		909,149
Multifamily	601,844		688		—		732		1,420		603,264
Retail	503,224		—		—		474		474		503,698
Office	453,960		—		956		1,454		2,410		456,370
Other	956,181		7,035		76		1,034		8,145		964,326
Residential real estate	1,410,473		12,359		1,907		7,719		21,985		1,432,458
Construction real estate	404,595		2,254		—		—		2,254		406,849
Indirect vehicle	661,028		4,905		1,083		912		6,900		667,928
Home equity	210,831		3,161		1,073		4,033		8,267		219,098
Other consumer	72,846		202		36		57		295		73,141
Total loans, excluding purchased credit-impaired loans	13,762,588		43,626		13,935		26,169		83,730		13,846,318
Purchased credit-impaired loans	63,937		8,749		3,997		43,061		55,807		119,744
Total loans	$	13,826,525	$	52,375	$	17,932	$	69,230	$	139,537	$	13,966,062
Non-performing loan aging	$	36,879	$	8,799	$	4,961	$	26,169	$	39,929	$	76,808

Recorded Investment in Non-accrual Loans and Loans Past Due Ninety Days or More and Still Accruing by Class of Loans

The following table presents the recorded investment in non-accrual loans and loans past due ninety days or more and still accruing by class of loans, excluding purchased credit-impaired loans, as of September 30, 2018 and December 31, 2017 (in thousands):

	September 30, 2018				December 31, 2017
			Loans past due				Loans past due
	Non-accrual		90 days or more and still accruing		Non-accrual		90 days or more and still accruing
Commercial	$	24,086	$	—	$	14,001	$	3,500
Commercial collateralized by assignment of lease payments	630		662		490		531
Commercial real estate:
Health care	—		—		—		—
Industrial	2,811		—		8,807		—
Multifamily	568		—		860		—
Office	432		—		2,772		—
Retail	819		—		590		—
Other	5,887		39		8,016		190
Residential real estate	20,080		381		18,374		1,210
Construction real estate	—		—		—		—
Indirect vehicle	4,051		73		3,019		81
Home equity	13,068		—		14,305		—
Other consumer	5		139		4		58
Total	$	72,437	$	1,294	$	71,238	$	5,570

Risk Category of Loans by Class of Loans

The following tables present the risk category of loans by class of loans based on the most recent analysis performed, excluding purchased credit-impaired loans, as of September 30, 2018 and December 31, 2017 (in thousands):

	Pass		Special Mention		Substandard		Doubtful		Total
September 30, 2018
Commercial	$	4,627,512	$	161,909	$	147,115	$	—	$	4,936,536
Commercial collateralized by assignment of lease payments	2,051,164		8,422		6,002		—		2,065,588
Commercial real estate:
Health care	544,562		49,515		70,379		—		664,456
Industrial	840,860		14,820		13,045		—		868,725
Multifamily	500,369		606		3,279		—		504,254
Retail	457,416		19,862		3,121		—		480,399
Office	408,532		1,964		7,954		—		418,450
Other	857,001		10,463		28,284		—		895,748
Construction real estate	546,012		1,645		1,225		—		548,882
Total	$	10,833,428	$	269,206	$	280,404	$	—	$	11,383,038
December 31, 2017
Commercial	$	4,535,111	$	147,232	$	103,837	$	—	$	4,786,180
Commercial collateralized by assignment of lease payments	2,095,668		7,527		9,940		—		2,113,135
Commercial real estate:
Health care	640,751		33,672		36,299		—		710,722
Industrial	885,524		12,411		11,214		—		909,149
Multifamily	595,818		146		7,300		—		603,264
Retail	492,830		8,326		2,542		—		503,698
Office	452,902		696		2,772		—		456,370
Other	891,703		37,682		34,941		—		964,326
Construction real estate	406,849		—		—		—		406,849
Total	$	10,997,156	$	247,692	$	208,845	$	—	$	11,453,693

Recorded Investment in Loan Classes Based on Payment Activity

The following table presents the recorded investment in those loan classes based on payment activity, excluding purchased credit-impaired loans, as of September 30, 2018 and December 31, 2017 (in thousands):

	Performing		Non-performing		Total
September 30, 2018
Residential real estate	$	1,382,626	$	20,461	$	1,403,087
Indirect vehicle	786,449		4,124		790,573
Home equity	168,409		13,068		181,477
Other consumer	85,561		144		85,705
Total	$	2,423,045	$	37,797	$	2,460,842
December 31, 2017
Residential real estate	$	1,412,874	$	19,584	$	1,432,458
Indirect vehicle	664,828		3,100		667,928
Home equity	204,793		14,305		219,098
Other consumer	73,079		62		73,141
Total	$	2,355,574	$	37,051	$	2,392,625

Loans Individually Evaluated for Impairment by Class of Loans

The following tables present loans individually evaluated for impairment by class of loans, excluding purchased credit-impaired loans, as of September 30, 2018 and December 31, 2017 (in thousands):

	September 30, 2018
									Three Months Ended				Nine Months Ended
	Unpaid Principal Balance		Recorded Investment		Partial Charge-offs		Allowance for Loan Losses Allocated		Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial	$	35,407	$	14,641	$	20,766	$	—	$	17,634	$	222	$	10,430	$	222
Commercial collateralized by assignment of lease payments	—		—		—		—		—		—		—		—
Commercial real estate:
Health care	—		—		—		—		—		—		—		—
Industrial	3,426		2,811		615		—		3,491		—		1,176		—
Multifamily	—		—		—		—		—		—		—		—
Retail	—		—		—		—		—		—		—		—
Office	—		—		—		—		—		—		—		—
Other	—		—		—		—		—		—		1,096		52
Residential real estate	3,847		3,809		38		—		2,260		—		3,261		—
Construction real estate	—		—		—		—		—		—		—		—
Indirect vehicle	775		449		326		—		853		3		660		31
Home equity	79		79		—		—		79		—		27		—
Other consumer	—		—		—		—		—		—		—		—
With an allowance recorded:
Commercial	7,996		7,996		—		797		8,559		85		6,147		182
Commercial collateralized by assignment of lease payments	—		—		—		—		—		—		110		—
Commercial real estate:
Health care	—		—		—		—		—		—		357		28
Industrial	—		—		—		—		—		—		2,126		8
Multifamily	—		—		—		—		—		—		—		—
Retail	—		—		—		—		—		—		—		—
Office	—		—		—		—		—		—		—		—
Other	4,766		4,766		—		438		4,894		—		3,032		124
Residential real estate	19,604		17,591		2,013		1,621		17,590		—		18,496		32
Construction real estate	—		—		—		—		—		—		—		—
Indirect vehicle	—		—		—		—		—		—		—		—
Home equity	29,741		26,890		2,851		1,534		27,102		—		28,563		30
Other consumer	—		—		—		—		—		—		—		—
Total	$	105,641	$	79,032	$	26,609	$	4,390	$	82,462	$	310	$	75,481	$	709

	December 31, 2017
									Year Ended
	Unpaid Principal Balance		Recorded Investment		Partial Charge-offs		Allowance for Loan Losses Allocated		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial	$	8,312	$	7,771	$	541	$	—	$	5,595	$	95
Commercial collateralized by assignment of lease payments	—		—		—		—		301		—
Commercial real estate:
Health care	—		—		—		—		—		—
Industrial	—		—		—		—		1,260		8
Multifamily	—		—		—		—		1,261		29
Retail	—		—		—		—		814		27
Office	527		527		—		—		1,426		18
Other	10,597		10,597		—		—		2,312		128
Residential real estate	1,950		1,912		38		—		483		—
Construction real estate	—		—		—		—		—		—
Indirect vehicle	408		202		206		—		411		26
Home equity	81		81		—		—		376		—
Other consumer	—		—		—		—		—		—
With an allowance recorded:
Commercial	7,418		7,418		—		2,315		7,668		277
Commercial collateralized by assignment of lease payments	—		—		—		—		126		14
Commercial real estate:
Health care	—		—		—		—		—		—
Industrial	8,339		8,317		22		2,669		3,215		171
Multifamily	568		568		—		320		426		—
Retail	—		—		—		—		1,345		28
Office	2,293		2,277		16		752		636		4
Other	—		—		—		—		29		—
Residential real estate	21,380		19,014		2,366		2,158		17,616		25
Construction real estate	—		—		—		—		—		—
Indirect vehicle	—		—		—		—		—		—
Home equity	30,762		28,286		2,476		2,200		27,982		54
Other consumer	—		—		—		—		—		—
Total	$	92,635	$	86,970	$	5,665	$	10,414	$	73,282	$	904

Schedule of Loans That Have Been Restructured

The following table presents loans that were restructured during the three months ended September 30, 2018 (dollars in thousands):

	September 30, 2018
	Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment		Charge-offs and Specific Reserves
Performing:
Residential real estate	1	$	132	$	132	$	12
Home equity	1	91		91		5
Total	2	$	223	$	223	$	17
Non-Performing:
Commercial	1	$	750	$	750	$	—
Residential real estate	3	709		709		246
Indirect vehicle	21	151		151		110
Home equity	2	396		396		219
Total	27	$	2,006	$	2,006	$	575

The following table presents loans that were restructured during the nine months endedSeptember 30, 2018 (dollars in thousands):

	September 30, 2018
	Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment		Charge-offs and Specific Reserves
Performing:
Residential real estate	2	$	220	$	220	$	21
Home equity	1	91		91		5
Total	3	$	311	$	311	$	26
Non-Performing:
Commercial	1	$	750	$	750	$	—
Residential real estate	19	3,150		3,150		1,184
Indirect vehicle	41	272		272		148
Home equity	7	606		606		233
Total	68	$	4,778	$	4,778	$	1,565

The following table presents loans that were restructured during the three months ended September 30, 2017 (dollars in thousands):

	September 30, 2017
	Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment		Charge-offs and Specific Reserves
Performing:
Commercial real estate:
Industrial	1	$	387	$	387	$	—
Retail	2	337		337		—
Other	2	3,555		3,555		—
Home equity	1	19		19		1
Total	6	$	4,298	$	4,298	$	1
Non-Performing:
Residential real estate	11	$	2,775	$	2,775	$	739
Indirect vehicle	20	153		153		105
Home equity	1	15		15		1
Total	32	$	2,943	$	2,943	$	845

The following table presents loans that were restructured during the nine months endedSeptember 30, 2017 (dollars in thousands):

	September 30, 2017
	Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment		Charge-offs and Specific Reserves
Performing:
Commercial	5	$	2,491	$	2,491	$	373
Commercial real estate
Industrial	3	3,174		3,174		—
Retail	2	337		337		—
Office	1	549		549		—
Other	3	3,703		3,703		—
Residential real estate	6	902		902		135
Home equity	4	97		97		7
Total	24	$	11,253	$	11,253	$	515
Non-Performing:
Commercial	2	$	676	$	676	$	—
Commercial real estate:
Multifamily	3	290		290		—
Retail	1	906		906		—
Residential real estate	28	5,155		5,155		1,182
Indirect vehicle	31	250		250		134
Home equity	4	608		608		58
Total	69	$	7,885	$	7,885	$	1,374

Troubled Debt Restructuring Activity Rollforward

The following table presents the troubled debt restructurings activity during the nine months endedSeptember 30, 2018 (in thousands):

	Performing			Non-performing
Beginning balance	$	28,554		$	30,836
Additions	311			4,778
Charge-offs	—			(3,057		)
Principal payments, net	(8,010		)	(6,398		)
Removals	(77		)	(8		)
Transfer to other real estate owned	—			—
Transfers in	2,970			778
Transfers out	(778		)	(2,970		)
Ending balance	$	22,970		$	23,959

Type of Financing Receivable Modifications and Restructuring

The following table presents the type of modification for loans that have been restructured during the nine months endedSeptember 30, 2018 (in thousands):

	September 30, 2018
	Extended
	Maturity,				Delay in
	Amortization		Extended		Payments and/or
	and Reduction		Maturity and/or		Reduction of
	of Interest Rate		Amortization		Interest Rate		Total
Commercial	$	—	$	750	$	—	$	750
Residential real estate	2,097		862		411		3,370
Indirect vehicle	—		—		272		272
Home equity	293		404		—		697
Total	$	2,390	$	2,016	$	683	$	5,089

Allowance Activity for Credit Losses, Balance in Allowance for Credit Losses and Recorded Investment in Loans by Portfolio Segment

The following table presents the activity in the allowance for credit losses, balance in allowance for credit losses and recorded investment in loans by portfolio segment and based on impairment method as of September 30, 2018 and 2017 (in thousands):

	Commercial		Commercial collateralized by assignment of lease payments		Commercial real estate		Residential real estate			Construction real estate		Indirect vehicle			Home equity		Other consumer		Unfunded commitments		Total
September 30, 2018
Allowance for credit losses:
Three Months Ended
Beginning balance	$	40,318	$	13,095	$	65,391	$	5,732		$	26,792	$	4,738		$	4,142	$	2,582	$	1,788	$	164,578
Charge-offs	20,895		7,181		704		76			—		1,726			724		294		—		31,600
Recoveries	639		846		424		121			13		554			261		80		—		2,938
Provision	12,611		5,946		1,078		(445		)	66		(486		)	2,111		402		220		21,503
Ending balance	$	32,673	$	12,706	$	66,189	$	5,332		$	26,871	$	3,080		$	5,790	$	2,770	$	2,008	$	157,419
Nine Months Ended
Beginning balance	$	46,267	$	13,007	$	63,429	$	7,012		$	15,501	$	4,728		$	5,296	$	2,470	$	1,698	$	159,408
Charge-offs	23,831		7,897		5,801		805			—		4,878			972		954		—		45,138
Recoveries	1,143		1,246		1,515		217			443		2,397			559		399		—		7,919
Provision	9,094		6,350		7,046		(1,092		)	10,927		833			907		855		310		35,230
Ending balance	$	32,673	$	12,706	$	66,189	$	5,332		$	26,871	$	3,080		$	5,790	$	2,770	$	2,008	$	157,419
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$	797	$	—	$	438	$	1,621		$	—	$	—		$	1,534	$	—	$	754	$	5,144
Collectively evaluated for impairment	31,638		12,706		64,710		3,711			26,835		3,080			4,256		2,770		1,254		150,960
Acquired and accounted for under ASC 310-30 (1)	238		—		1,041		—			36		—			—		—		—		1,315
Total ending allowance balance	$	32,673	$	12,706	$	66,189	$	5,332		$	26,871	$	3,080		$	5,790	$	2,770	$	2,008	$	157,419
Loans:
Individually evaluated for impairment	$	22,637	$	—	$	7,577	$	21,400		$	—	$	449		$	26,969	$	—	$	—	$	79,032
Collectively evaluated for impairment	4,913,899		2,065,588		3,824,455		1,381,687			548,882		790,124			154,508		85,705		—		13,764,848
Acquired and accounted for under ASC 310-30 (1)	7,173		—		22,173		47,929			3,646		—			8,999		1,152		—		91,072
Total ending loans balance	$	4,943,709	$	2,065,588	$	3,854,205	$	1,451,016		$	552,528	$	790,573		$	190,476	$	86,857	$	—	$	13,934,952

	Commercial			Commercial collateralized  by assignment of lease payments		Commercial real estate		Residential real estate		Construction real estate			Indirect vehicle		Home equity		Other consumer		Unfunded commitments			Total
September 30, 2017
Allowance for credit losses:
Three Months Ended
Beginning balance	$	43,783		$	12,765	$	63,247	$	8,249	$	15,263		$	3,963	$	4,750	$	2,013	$	2,264		$	156,297
Charge-offs	235			188		31		541		—			1,097		439		299		—			2,830
Recoveries	719			—		1,432		38		502			498		149		82		—			3,420
Provision	1,715			240		935		94		(707		)	1,317		422		489		12			4,517
Ending balance	$	45,982		$	12,817	$	65,583	$	7,840	$	15,058		$	4,681	$	4,882	$	2,285	$	2,276		$	161,404
Nine Months Ended
Beginning balance	$	44,661		$	12,238	$	51,807	$	5,971	$	14,758		$	3,421	$	4,689	$	1,821	$	2,476		$	141,842
Charge-offs	1,103			188		1,378		901		—			3,438		873		1,243		—			9,124
Recoveries	3,568			712		2,312		624		661			1,715		724		420		—			10,736
Provision	(1,144		)	55		12,842		2,146		(361		)	2,983		342		1,287		(200		)	17,950
Ending balance	$	45,982		$	12,817	$	65,583	$	7,840	$	15,058		$	4,681	$	4,882	$	2,285	$	2,276		$	161,404
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$	1,012		$	585	$	855	$	2,169	$	—		$	—	$	2,562	$	—	$	1,220		$	8,403
Collectively evaluated for impairment	44,879			12,232		63,868		5,671		15,023			4,681		2,320		2,285		1,056			152,015
Acquired and accounted for under ASC 310-30 (1)	91			—		860		—		35			—		—		—		—			986
Total ending allowance balance	$	45,982		$	12,817	$	65,583	$	7,840	$	15,058		$	4,681	$	4,882	$	2,285	$	2,276		$	161,404
Loans:
Individually evaluated for impairment	$	10,642		$	921	$	11,999	$	19,370	$	—		$	349	$	27,468	$	—	$	—		$	70,749
Collectively evaluated for impairment	4,783,196			2,073,294		4,082,707		1,414,225		395,794			654,864		201,258		77,372		—			13,682,710
Acquired and accounted for under ASC 310-30 (1)	13,677			—		32,063		68,071		5,183			—		11,200		1,725		—			131,919
Total ending loans balance	$	4,807,515		$	2,074,215	$	4,126,769	$	1,501,666	$	400,977		$	655,213	$	239,926	$	79,097	$	—		$	13,885,378

⁽¹⁾  Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 “Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality.”

Changes in the Accretable Yield for Purchased Credit-Impaired Loans

Changes in the accretable yield for loans acquired and accounted for under ASC 310-30 were as follows for the three and nine months endedSeptember 30, 2018 and 2017 (in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2018			2017			2018			2017
Balance at beginning of period	$	8,241		$	12,686		$	12,069		$	16,050
Purchases	—			—			—			43
Accretion	(2,579		)	(4,315		)	(7,213		)	(9,334		)
Other (1)	236			3,453			1,042			5,065
Balance at end of period	$	5,898		$	11,824		$	5,898		$	11,824

⁽¹⁾  Primarily includes discount transfers from non-accretable discount to accretable discount due to better than expected performance of loan pools acquired and accounted for under ASC 310-30.

Carrying Amount of Loans Acquired Through a Business Combination by Loan Pool Type

The carrying amount of loans acquired through a business combination by loan pool type are as follows (in thousands):

September 30, 2018	Purchased Credit-Impaired Loans		Purchased Non-Credit-Impaired Loans		Total
Covered loans (1):
Consumer related	$	12,979	$	—	$	12,979
Non-covered loans:
Commercial loans	7,173		122,630		129,803
Commercial loans collateralized by assignment of lease payments	—		14,114		14,114
Commercial real estate	22,173		536,351		558,524
Construction real estate	3,646		1,618		5,264
Consumer related	4,857		212,838		217,695
Total non-covered loans	37,849		887,551		925,400
Total acquired	$	50,828	$	887,551	$	938,379

⁽¹⁾  Covered loans refer to loans covered under loss-sharing agreements with the FDIC. The remaining loss-share agreements expire between 2019 and 2020.

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Goodwill and Intangibles (Tables)

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Carrying Amount of Goodwill

The following table presents the carrying amount of goodwill by segment for the nine months endedSeptember 30, 2018 (in thousands):

	Banking		Leasing		Mortgage Banking			Total
Balance at beginning of period	$	959,285	$	40,640	$	3,623		$	1,003,548
Impairment	—		—		(3,623		)	(3,623		)
Balance at end of period	$	959,285	$	40,640	$	—		$	999,925

Changes in the Carrying Amount of Core Deposit and Client Relationship Intangibles

The following table presents the changes during the nine months endedSeptember 30, 2018 in the carrying amount of core deposit and client relationship intangibles, and the gross carrying amount, accumulated amortization, and net book value as of September 30, 2018 (in thousands):

	September 30, 2018
Balance at beginning of period	$	54,766
Amortization expense	(5,652		)
Balance at end of period	$	49,114
Gross carrying amount	$	112,820
Accumulated amortization	(63,706		)
Net book value	$	49,114

Estimated Future Amortization Expense of Other Intangible Assets

The following presents the estimated future amortization expense of other intangible assets (in thousands):

Year ending December 31,	Amount
2018	$	1,799
2019	5,674
2020	5,022
2021	4,790
2022	3,806
Thereafter	28,023
	$	49,114

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Deposits (Tables)

9 Months Ended

Sep. 30, 2018

Banking and Thrift [Abstract]

Schedule of Composition of Deposits

The composition of deposits was as follows as of September 30, 2018 and December 31, 2017 (in thousands):

	September 30,		December 31,
	2018		2017
Demand deposit accounts, non-interest bearing	$	6,036,012	$	6,381,512
NOW, money market, and interest bearing deposits	5,125,330		4,954,765
Savings accounts	1,180,997		1,167,810
Certificates of deposit, $250,000 or more	1,375,549		1,506,071
Other certificates of deposit	990,905		948,220
Total	$	14,708,793	$	14,958,378

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Short-Term Borrowings (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Summary of Short-Term Borrowings

Short-term borrowings were as follows as of September 30, 2018 and December 31, 2017 (dollars in thousands):

	September 30, 2018				December 31, 2017
	Weighted Average Interest Rate		Amount		Weighted Average Interest Rate		Amount
Customer repurchase agreements	0.77	%	$	311,605	0.27	%	$	232,789
Federal Home Loan Bank advances	2.19		500,000		1.31		625,000
Federal funds purchased	2.35		91,750		1.26		3,250
Line of credit	—		—		—		—
Total	1.71	%	$	903,355	1.03	%	$	861,039

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Long-Term Borrowings (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Borrowings

Long-term borrowings were as follows as of September 30, 2018 and December 31, 2017 (dollars in thousands):

	September 30, 2018				December 31, 2017
	Weighted Average Interest Rate		Amount		Weighted Average Interest Rate		Amount
Federal Home Loan Bank advances	2.65	%	$	198,939	1.73	%	$	231,317
Notes payable	4.77		79,675		4.14		90,807
Subordinated notes, net of issuance costs	4.00		173,063		4.00		173,034
Term note	—		—		3.31		10,000
Total	3.54	%	$	451,677	2.97	%	$	505,158

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Junior Subordinated Notes Issued to Capital Trusts (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Outstanding Junior Subordinated Notes and the Related Trust Preferred Securities Issued by Each Trust

The table below summarizes the outstanding junior subordinated notes and the related trust preferred securities issued by each trust as of September 30, 2018 (in thousands).

	MB Financial Capital Trust II		MB Financial Capital Trust III		MB Financial Capital Trust IV
Junior Subordinated Notes:
Principal balance	$	36,083	$	10,310	$	20,619
Annual interest rate	3-mo LIBOR + 1.40%		3-mo LIBOR + 1.50%		3-mo LIBOR + 1.52%
Stated maturity date	September 15, 2035		September 23, 2036		September 15, 2036
Call date	December 15, 2010		September 23, 2011		September 15, 2011
Trust Preferred Securities:
Face Value	$	35,000	$	10,000	$	20,000
Annual distribution rate	3-mo LIBOR + 1.40%		3-mo LIBOR + 1.50%		3-mo LIBOR + 1.52%
Issuance date	August 2005		July 2006		August 2006
Distribution dates (1)	Quarterly		Quarterly		Quarterly

	MB Financial Capital Trust V		MB Financial Capital Trust VI		FOBB Statutory Trust III (2)(4)
Junior Subordinated Notes:
Principal balance	$	30,928	$	23,196	$	5,155
Annual interest rate	3-mo LIBOR + 1.30%		3-mo LIBOR + 1.30%		3-mo LIBOR + 2.80%
Stated maturity date	December 15, 2037		October 30, 2037		January 23, 2034
Call date	December 15, 2012		October 30, 2012		January 23, 2009
Trust Preferred Securities:
Face Value	$	30,000	$	22,500	$	5,000
Annual distribution rate	3-mo LIBOR + 1.30%		3-mo LIBOR + 1.30%		3-mo LIBOR + 2.80%
Issuance date	September 2007		October 2007		December 2003
Distribution dates (1)	Quarterly		Quarterly		Quarterly

	American Chartered Statutory Trust II (3)(4)
Junior Subordinated Notes:
Principal balance	$	10,310
Annual interest rate	3-mo LIBOR + 2.75%
Stated maturity date	October 7, 2034
Call date	October 7, 2009
Trust Preferred Securities:
Face Value	$	10,000
Annual distribution rate	3-mo LIBOR + 2.75%
Issuance date	August 2004
Distribution dates (1)	Quarterly

⁽¹⁾  All distributions are cumulative and paid in cash.

⁽²⁾  FOBB Statutory Trust III was established by First Oak Brook Bancshares, Inc. (“FOBB”) prior to the Company's acquisition of FOBB in 2006, and the junior subordinated notes issued by FOBB to FOBB Statutory Trust III were assumed by the Company upon completion of the acquisition.

⁽³⁾  American Chartered Statutory Trust II was established by American Chartered prior to the Company's acquisition of American Chartered in August 2016, and the junior subordinated notes issued by American Chartered to American Chartered Statutory Trust II were assumed by the Company upon completion of the acquisition. Principal balance and face value amounts associated with American Chartered Statutory Trust II do not include acquisition accounting adjustments to such amounts, which in each case resulted in a remaining discount of $2.6 million at September 30, 2018.

⁽⁴⁾  Subsequent to September 30, 2018, the Company redeemed all of the outstanding junior subordinated notes held by American Chartered Statutory Trust II, which concurrently redeemed all of its outstanding trust preferred securities, and the Company redeemed all of the outstanding junior subordinated notes held by FOBB Statutory Trust III, which concurrently redeemed all of its outstanding trust preferred securities. See Note 18. Subsequent Events.

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Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Outstanding Financial Instruments, Contractual Amounts of Off-Balance Sheet Credit Risk

At September 30, 2018 and December 31, 2017, the following financial instruments were outstanding, the contractual amounts of which represent off-balance sheet credit risk (in thousands):

	Contractual Amount
	September 30, 2018		December 31, 2017
Commitments to extend credit:
Home equity lines	$	191,427	$	203,922
Other commitments	4,033,841		4,073,044
Letters of credit:
Standby	173,565		161,014
Commercial	1,564		2,248

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis

The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of September 30, 2018 and December 31, 2017, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands):

	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2018
Financial assets
Securities available for sale:
U.S Government sponsored agencies and enterprises	$	5,002	$	—	$	5,002	$	—
States and political subdivisions	343,256		—		342,927		329
Residential mortgage-backed securities	1,316,274		—		1,316,261		13
Commercial mortgage-backed securities	41,040		—		41,040		—
Corporate bonds	5,064		—		5,064		—
Marketable equity securities	10,901		10,901		—		—
Loans held for sale	51,834		—		51,834		—
Loans	42,363		—		42,363		—
Mortgage servicing rights	295,803		—		—		295,803
Assets held in trust for deferred compensation	25,605		25,605		—		—
Derivative financial instruments	58,196		198		57,998		—
Financial liabilities
Other liabilities (1)	25,605		25,605		—		—
Derivative financial instruments	59,309		351		58,726		232
December 31, 2017
Financial assets
Securities available for sale:
U.S. Government sponsored agencies and enterprises	$	23,007	$	—	$	23,007	$	—
States and political subdivisions	379,325		—		378,996		329
Residential mortgage-backed securities	852,699		—		852,665		34
Commercial mortgage-backed securities	72,035		—		72,035		—
Corporate bonds	70,197		—		70,197		—
Equity securities	11,063		11,063		—		—
Loans held for sale	548,578		—		548,578		—
Loans	40,531		—		40,531		—
Mortgage servicing rights	276,279		—		—		276,279
Assets held in trust for deferred compensation	21,410		21,410		—		—
Derivative financial instruments	31,499		389		29,539		1,571
Financial liabilities
Other liabilities (1)	21,410		21,410		—		—
Derivative financial instruments	40,296		1,072		39,224		—

⁽¹⁾  Liabilities associated with assets held in trust for deferred compensation

Summary of Financial Assets Measured at Fair Value on a Recurring Basis, Unobservable Inputs Used

The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a nonrecurring basis that were categorized within the Level 3 of the fair value hierarchy (fair value in thousands):

	Fair Value at		Valuation
	September 30, 2018		Technique	Unobservable Input	Range
Impaired loans	$	69,721	Appraisal of collateral	Appraisal adjustments - sales costs	5% - 10%
Foreclosed assets	14,464		Appraisal of collateral	Appraisal adjustments - sales costs	5% - 10%

	Fair Value at		Valuation
	December 31, 2017		Technique	Unobservable Input	Range
Impaired loans	$	60,569	Appraisal of collateral	Appraisal adjustments - sales costs	5% - 10%
Foreclosed assets	15,113		Appraisal of collateral	Appraisal adjustments - sales costs	5% - 10%

The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a recurring basis that were categorized within the Level 3 of the fair value hierarchy (fair value in thousands):

	Fair Value at
	September 30, 2018		Valuation Technique	Unobservable Input	Range
States and political subdivisions	$	329	Discounted cash flows	Credit assumption	40% - 45% Loss
Residential mortgage-backed securities	13		Discounted cash flows	Constant pre-payment rates (CPR)	1% - 3%
Mortgage servicing rights	295,803		Discounted cash flows	CPR	6.20% - 6.60%
				Discount rate	9.53 - 11.08
				Maturity (months)	327 - 358
				Delinquency rate	2.32 - 4.84
				Costs to service	$ 67 - $ 227
				Additive delinquent costs to service	$ 175 - $ 1,000
Derivative financial instruments (mortgage	—		Sales cash flows	Expected closing ratio	70% - 95%
interest rate lock commitments)				Expected delivery price	99.45 bps - 104.56 bps

	Fair Value at
	December 31, 2017		Valuation Technique	Unobservable Input	Range
States and political subdivisions	$	329	Discounted cash flows	Credit assumption	40-45% Loss
Residential mortgage-backed securities	34		Discounted cash flows	Constant pre-payment rates (CPR)	1% - 3%
Mortgage servicing rights	276,279		Discounted cash flows	CPR	6.7% - 7.8%
				Discount rate	9.53 - 11.06
				Maturity (months)	324 - 358
				Delinquency rate	2.42 - 5.30
				Costs to service	$ 67 - $ 227
				Additive delinquent costs to service	$ 175 - $ 1,000
Derivative financial instruments (mortgage	1,571		Sales cash flows	Expected closing ratio	70% - 95%
interest rate lock commitments)				Expected delivery price	97.38 bps - 106.87 bps

Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets

Key economic assumptions used in the measuring of the fair value of the mortgage servicing rights and the sensitivity of the fair value to immediate adverse changes in those assumptions at September 30, 2018 are presented in the following table. This table does not take into account the derivatives used to economically hedge the mortgage servicing rights.

(dollars in thousands, except for weighted average cost to service)	September 30, 2018
Weighted average CPR	6.40		%
Impact on fair value of 10% adverse change	$	(8,430	)
Impact on fair value of 20% adverse change	(16,451		)
Weighted average discount rate	9.84		%
Impact on fair value of 10% adverse change	$	(12,623	)
Impact on fair value of 20% adverse change	(24,232		)
Weighted average delinquency rate	4.58		%
Impact on fair value of 10% adverse change	$	(3,098	)
Impact on fair value of 20% adverse change	(5,299		)
Weighted average costs to service	$	91.00
Impact on fair value of 10% adverse change	(5,475		)
Impact on fair value of 20% adverse change	(10,949		)

Financial Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)

The following table presents additional information about financial assets measured at fair value on a recurring basis for which the Company used significant unobservable inputs (Level 3):

	Nine Months Ended
	September 30,
	2018			2017			2018			2017			2018			2017
(in thousands)	Investment Securities						Mortgage Servicing Rights						Derivatives
Balance, beginning of period	$	363		$	544		$	276,279		$	238,011		$	1,571		$	3,160
Purchases	—			—			161			839			—			—
Originations	—			—			30,086			43,197			—			—
Included in earnings	—			—			(10,723		)	(20,601		)	(1,571		)	(1,221		)
Principal payments	(21		)	(106		)	—			—			—			—
Sales	—			—			—			—			—			—
Balance, ending of period	$	342		$	438		$	295,803		$	261,446		$	—		$	1,939

Assets Measured at Fair Value on a Nonrecurring Basis

Assets measured at fair value on a nonrecurring basis as of September 30, 2018 and December 31, 2017 are included in the table below (in thousands):

	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
September 30, 2018
Financial assets:
Impaired loans	$	69,721	$	—	$	—	$	69,721
Non-financial assets:
Foreclosed assets	14,464		—		—		14,464
December 31, 2017
Financial assets:
Impaired loans	$	60,569	$	—	$	—	$	60,569
Non-financial assets:
Foreclosed assets	15,113		—		—		15,113

Estimated Fair Values of Financial Instruments

The estimated fair values of financial instruments are as follows (in thousands):

	September 30, 2018
	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial Assets:
Cash and due from banks	$	342,933	$	342,933	$	342,933	$	—	$	—
Interest earning deposits with banks	87,740		87,740		87,740		—		—
Investment securities available for sale	1,710,636		1,710,636		—		1,710,294		342
Investment securities held to maturity	923,082		932,756		—		932,756		—
Marketable equity securities	10,901		10,901		10,901		—		—
Non-marketable securities - FHLB and FRB stock	107,407		107,407		—		—		107,407
Loans held for sale	51,834		51,834		—		51,834		—
Loans, net	13,779,541		13,836,445		—		42,362		13,794,083
Accrued interest receivable	66,122		66,122		66,122		—		—
Derivative financial instruments	58,196		58,196		198		57,998		—
Financial Liabilities:
Non-interest bearing deposits	$	6,036,012	$	6,036,012	$	6,036,012	$	—	$	—
Interest bearing deposits	8,672,781		8,659,683		—		—		8,659,683
Short-term borrowings	903,355		903,232		—		—		903,232
Long-term borrowings	451,677		451,620		—		—		451,620
Junior subordinated notes issued to capital trusts	133,995		108,394		—		—		108,394
Accrued interest payable	8,962		8,962		8,962		—		—
Derivative financial instruments	59,309		59,309		351		58,726		232

	December 31, 2017
	Carrying Amount		Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Financial Assets:
Cash and due from banks	$	397,880	$	397,880	$	397,880	$	—	$	—
Interest earning deposits with banks	181,341		181,341		181,341		—		—
Investment securities available for sale	1,408,326		1,408,326		11,063		1,396,900		363
Investment securities held to maturity	959,082		992,455		—		992,455		—
Non-marketable securities - FHLB and FRB stock	114,111		114,111		—		—		114,111
Loans held for sale	548,578		548,578		—		548,578		—
Loans, net	13,808,352		13,988,392		—		40,531		13,947,861
Accrued interest receivable	63,589		63,589		63,589		—		—
Derivative financial instruments	31,499		31,499		389		29,539		1,571
Financial Liabilities:
Non-interest bearing deposits	$	6,381,512	$	6,381,512	$	6,381,512	$	—	$	—
Interest bearing deposits	8,576,866		8,569,368		—		—		8,569,368
Short-term borrowings	861,039		860,676		—		—		860,676
Long-term borrowings	505,158		513,725		—		—		513,725
Junior subordinated notes issued to capital trusts	211,494		170,965		—		—		170,965
Accrued interest payable	6,458		6,458		6,458		—		—
Derivative financial instruments	40,296		40,296		1,072		39,224		—

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Stock Incentive Plans (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-Based Payment Plans

The following table summarizes the impact of the Company’s share-based payment plans in the financial statements for the periods shown (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2018		2017		2018		2017
Total compensation expense for share-based payment plans during the period	$	4,542	$	4,393	$	13,688	$	13,317
Amount of related income tax benefit recognized in income (1)	1,507		2,175		5,460		8,513

⁽¹⁾ Includes tax benefits recorded for the vesting of restricted shares and exercise of options.

Summary of Changes in Stock Options

The following table summarizes changes in stock options for the nine months endedSeptember 30, 2018:

	Number of Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (In Years)	Aggregate Intrinsic Value (in thousands)
Options outstanding as of December 31, 2017	1,721,978		$	29.10	5.19
Granted	167,457		41.34
Exercised	(445,268	)	26.36
Expired	(2,293	)	33.08
Forfeited or cancelled	(24,031	)	30.56
Options outstanding as of September 30, 2018	1,417,843		$	31.37	5.92	$	20,908
Options exercisable as of September 30, 2018	928,013		$	28.46	4.78	$	16,393

Assumptions Used for Options Granted

 The following assumptions were used for options granted during the nine months endedSeptember 30, 2018:

	September 30, 2018
Risk-free interest rate	2.80		%
Expected volatility of Company’s stock	25.90		%
Expected dividend yield	2.06		%
Expected life of options	5.7 years
Weighted average fair value per option of options granted during the year	$	9.45

Summary of Changes in Restricted Shares and Units

The following is a summary of changes in restricted shares and units for the nine months endedSeptember 30, 2018:

	Number of Shares and Units		Weighted Average Grant Date Fair Value
Shares and units outstanding at December 31, 2017	973,201		$	37.03
Granted	427,939		41.66
Vested	(316,639	)	34.73
Forfeited or cancelled	(108,293	)	35.74
Shares and units outstanding at September 30, 2018	976,208		39.95

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Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of Derivative Financial Instruments

The Company’s derivative financial instruments are summarized below as of September 30, 2018 and December 31, 2017 (in thousands):

	Asset Derivatives								Liability Derivatives
	September 30, 2018				December 31, 2017				September 30, 2018					December 31, 2017
	Notional		Estimated		Notional		Estimated		Notional		Estimated			Notional		Estimated
	Amount		Fair Value		Amount		Fair Value		Amount		Fair Value			Amount		Fair Value
Derivative instruments designated as hedges of fair value:
Interest rate swap contracts (1)	$	—	$	—	$	—	$	—	$	18	$	(1	)	$	58	$	(1	)
Stand-alone derivative instruments: (2)
Interest rate swap contracts	1,713,998		38,624		1,563,109		21,217		1,713,998		(38,624		)	1,563,109		(21,217		)
Interest rate options contracts	506,760		4,324		372,927		1,887		506,760		(4,324		)	372,927		(1,887		)
Foreign exchange contracts	52,175		2,354		40,713		1,934		70,111		(2,298		)	34,029		(1,759		)
Spot foreign exchange contracts	13,036		35		1,424		23		3,119		(8		)	24		—
Mortgage related derivatives:
Interest rate swap contracts	225,000		12,661		458,000		4,479		275,000		(13,472		)	1,008,000		(14,360		)
Interest rate swaptions contracts	—		—		—		—		—		—			—		—
Treasury futures contracts	25,000		20		28,000		39		22,500		(88		)	30,000		(222		)
TBA mortgage securities	—		—		15,000		16		50,000		(250		)	100,000		(63		)
Forward loan sale commitments	35,800		178		259,000		333		9,500		(12		)	483,500		(787		)
Interest rate lock commitments	—		—		404,557		1,571		33,351		(232		)	—		—
Total stand-alone derivative instruments	2,571,769		58,196		3,142,730		31,499		2,684,339		(59,308		)	3,591,589		(40,295		)
Total	$	2,571,769	$	58,196	$	3,142,730	$	31,499	$	2,684,357	$	(59,309	)	$	3,591,647	$	(40,296	)

⁽¹⁾ Derivative instruments designated to hedge fixed-rate commercial real estate loans.

⁽²⁾ These portfolio swaps are not designated as hedging instruments under ASC Topic 815.

Schedule of the Amounts Included in Consolidated Statements of Operations Related to Derivative Financial Instruments

Amounts included in other operating income in the consolidated statements of operations related to derivative financial instruments were as follows (in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2018			2017			2018			2017
Derivative instruments designated as hedges of fair value:
Interest rate swap contracts	$	—		$	—		$	1		$	2
Stand-alone derivative instruments:
Interest rate swap contracts	617			3,276			4,245			6,749
Interest rate options contracts	—			—			—			—
Foreign exchange contracts	(83		)	(70		)	172			190
Spot foreign exchange contracts	723			629			2,340			2,036
Mortgage related derivatives	(1,630		)	(11,625		)	(3,083		)	(22,067		)
Total stand-alone derivative instruments	(373		)	(7,790		)	3,674			(13,092		)
Total	$	(373	)	$	(7,790	)	$	3,675		$	(13,090	)

Schedule of Financial Instruments Eligible for Offset In the Consolidated Balance Sheet

Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of September 30, 2018 is summarized below (in thousands):

	Financial Assets						Financial Liabilities
	Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized		Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized
Derivatives:
Interest rate swap contracts, caps and floors	$	39,790	$	—	$	39,790	$	3,046	$	—	$	3,046
Foreign exchange contracts	700		—		700		1,802		—		1,802
Mortgage related derivatives	12,859		—		12,859		13,823		—		13,823
Total derivatives	53,349		—		53,349		18,671		—		18,671
Repurchase agreements	—		—		—		311,605		—		311,605
Total	$	53,349	$	—	$	53,349	$	330,276	$	—	$	330,276

	Financial Assets										Financial Liabilities
	Net Amount Recognized		Financial Instruments			Collateral			Net Amount		Net Amount Recognized		Financial Instruments			Collateral			Net Amount
Derivatives:
Counterparty A	$	10,830	$	(2,550	)	$	(8,253	)	$	27	$	2,550	$	(2,550	)	$	—		$	—
Counterparty B	4,084		(430		)	(3,471		)	183		430		(430		)	—			—
Counterparty C	2,280		—			(1,950		)	330		—		—			—			—
Other counterparties	36,155		(15,560		)	(1,752		)	18,843		15,691		(15,560		)	(1,875		)	(1,744		)
Total derivatives	53,349		(18,540		)	(15,426		)	19,383		18,671		(18,540		)	(1,875		)	(1,744		)
Repurchase agreements	—		—			—			—		311,605		—			(311,605		)	—
Total	$	53,349	$	(18,540	)	$	(15,426	)	$	19,383	$	330,276	$	(18,540	)	$	(313,480	)	$	(1,744	)

Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of December 31, 2017 is summarized below (in thousands):

	Financial Assets						Financial Liabilities
	Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized		Gross Amount Recognized		Gross Amount Offset		Net Amount Recognized
Derivatives:
Interest rate swap contracts, caps and floors	$	11,659	$	—	$	11,659	$	11,562	$	—	$	11,562
Foreign exchange contracts	1,013		—		1,013		953		—		953
Mortgage related derivatives	4,868		—		4,868		15,432		—		15,432
Total derivatives	17,540		—		17,540		27,947		—		27,947
Repurchase agreements	—		—		—		232,789		—		232,789
Total	$	17,540	$	—	$	17,540	$	260,736	$	—	$	260,736

	Financial Assets									Financial Liabilities
	Net Amount Recognized		Financial Instruments			Collateral		Net Amount		Net Amount Recognized		Financial Instruments			Collateral			Net Amount
Derivatives:
Counterparty A	$	6,068	$	(6,068	)	$	—	$	—	$	13,807	$	(6,068	)	$	(7,739	)	$	—
Counterparty B	3,261		(3,261		)	—		—		5,595		(3,261		)	(2,334		)	—
Counterparty C	5,285		(3,640		)	—		1,645		3,640		(3,640		)	—			—
Other counterparties	2,926		(1,750		)	—		1,176		4,905		(1,750		)	(3,150		)	5
Total derivatives	17,540		(14,719		)	—		2,821		27,947		(14,719		)	(13,223		)	5
Repurchase agreements	—		—			—		—		232,789		—			(232,789		)	—
Total	$	17,540	$	(14,719	)	$	—	$	2,821	$	260,736	$	(14,719	)	$	(246,012	)	$	5

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Operating Segments (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Summary Financial Information for the Reportable Segments

The following tables present summary financial information for the reportable segments (in thousands):

	Banking		Leasing		Mortgage Banking			Consolidated
Three months ended September 30, 2018
Net interest income	$	152,003	$	2,160	$	7,685		$	161,848
Provision for credit losses	21,439		90		(26		)	21,503
Non-interest income	46,750		23,157		9,934			79,841
Non-interest expense (1)	126,979		15,611		25,954			168,544
Income tax expense	8,671		2,480		(2,223		)	8,928
Net income	$	41,664	$	7,136	$	(6,086	)	$	42,714
Total assets	$	16,677,552	$	1,340,901	$	1,701,518		$	19,719,971
Three months ended September 30, 2017
Net interest income	$	142,888	$	2,686	$	11,373		$	156,947
Provision for credit losses	3,637		399		481			4,517
Non-interest income	45,128		22,560		28,243			95,931
Non-interest expense (1)	113,014		14,498		35,449			162,961
Income tax expense	18,781		4,307		1,469			24,557
Net income	$	52,584	$	6,042	$	2,217		$	60,843
Total assets	$	16,406,714	$	1,307,459	$	2,402,362		$	20,116,535

⁽¹⁾  Includes merger related and repositioning expenses of $4.2 million and $9.8 million in the Banking and Mortgage Banking Segment, respectively, for the three months ended September 30, 2018 and $1.6 million in the Banking Segment for the three months ended September 30, 2017.

	Banking		Leasing		Mortgage Banking			Consolidated
Nine months ended September 30, 2018
Net interest income	$	439,088	$	6,991	$	28,219		$	474,298
Provision for credit losses	34,764		566		(100		)	35,230
Non-interest income	136,558		70,664		53,727			260,949
Non-interest expense (1)	367,489		46,319		115,614			529,422
Income tax expense	37,288		4,288		(8,985		)	32,591
Net income	$	136,105	$	26,482	$	(24,583	)	$	138,004
Total assets	$	16,677,552	$	1,340,901	$	1,701,518		$	19,719,971
Nine months ended September 30, 2017
Net interest income	$	410,319	$	7,300	$	31,365		$	448,984
Provision for credit losses	16,054		674		1,222			17,950
Non-interest income	130,564		62,136		86,851			279,551
Non-interest expense (1)	337,289		41,711		106,515			485,515
Income tax expense	50,103		10,951		4,170			65,224
Net income	$	137,437	$	16,100	$	6,309		$	159,846
Total assets	$	16,406,714	$	1,307,459	$	2,402,362		$	20,116,535

⁽¹⁾  Includes merger related and repositioning expenses of $9.6 million and $29.9 million in the Banking and Mortgage Banking Segment, respectively, for the nine months endedSeptember 30, 2018 and $9.0 million in the Banking Segment for the nine months endedSeptember 30, 2017.

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New Authoritative Accounting Guidance (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Accounting Changes and Prior Period Adjustments Restatement [Line Items]
Retained earnings	$ 1,147,060		$ 1,065,303
Cumulative effect of accounting changes			(297)
Accumulated Other Comprehensive Income (Loss), Net of Tax
Accounting Changes and Prior Period Adjustments Restatement [Line Items]
Cumulative effect of accounting changes			907
Retained Earnings
Accounting Changes and Prior Period Adjustments Restatement [Line Items]
Cumulative effect of accounting changes			(1,204)
Accounting Standards Update 2014-09 | Difference Between Revenue Guidance In Effect Before And After Topic 606
Accounting Changes and Prior Period Adjustments Restatement [Line Items]
Retained earnings			$ (683)
Accounting Standards Update, 2016-01 | Retained Earnings And Accumulated Other Comprehensive Income
Accounting Changes and Prior Period Adjustments Restatement [Line Items]
Cumulative effect of accounting changes		$ 385
Accounting Standards Update, 2016-01 | Accumulated Other Comprehensive Income (Loss), Net of Tax
Accounting Changes and Prior Period Adjustments Restatement [Line Items]
Cumulative effect of accounting changes		729
Accounting Standards Update, 2016-01 | Retained Earnings
Accounting Changes and Prior Period Adjustments Restatement [Line Items]
Cumulative effect of accounting changes		$ 729

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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 42,714		$ 60,843	$ 138,004	$ 159,846
Less: preferred stock dividends	3,000		2,002	9,100	6,007
Plus: return from preferred stockholders due to redemption	0		0	15,280	0
Net income available to common stockholders	39,714		58,841	144,184	153,839
Plus: preferred stock dividends on convertible preferred stock	0		2	0	7
Earnings allocated to common stockholders for diluted earnings per common share	$ 39,713		$ 58,842	$ 144,180	$ 153,843
Weighted average shares outstanding for basic earnings per common share (in shares)	84,369,519		83,891,175	84,230,835	83,799,694
Dilutive effect of convertible preferred stock (in shares)	0		6,144	0	6,867
Total dilutive effect of equity awards and convertible preferred stock (in shares)	965,590		888,622	931,385	976,258
Weighted average shares outstanding for diluted earnings per common share (in shares)	85,335,109		84,779,797	85,162,220	84,775,952
Basic earnings per common share (in dollars per share)	$ 0.47		$ 0.70	$ 1.71	$ 1.84
Diluted earnings per common share (in dollars per share)	$ 0.47		$ 0.69	$ 1.69	$ 1.81
Stock options
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of stock options and restricted shares/units (in shares)	463,024		502,794	508,270	564,541
Restricted shares and units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of stock options and restricted shares/units (in shares)	502,566		379,684	423,115	404,850
Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Distributed earnings allocated to common stock	$ 20,468		$ 17,823	$ 61,223	$ 51,783
Undistributed earnings	22,246		43,020	76,781	108,063
Net income	42,714		60,843	138,004	159,846
Net income available to common stockholders	$ 39,714		$ 58,841	$ 144,184	$ 153,839
Weighted average shares outstanding for basic earnings per common share (in shares)	84,369,519		83,891,175	84,230,835	83,799,694
Weighted average shares outstanding for diluted earnings per common share (in shares)	85,335,109		84,779,797	85,162,220	84,775,952
Participating Securities
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Less: earnings allocated to participating securities	$ 1		$ 1	$ 4	$ 3
Series A Preferred Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Preferred stock, dividend rate (percent)		8.00%		8.00%		8.00%

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Investment Securities - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Available for Sale
Amortized Cost	$ 1,730,526
Gross Unrealized Gains	10,199
Gross Unrealized Losses	(30,089)
Fair Value	1,710,636
Amortized Cost		$ 1,401,365
Gross Unrealized Gains		19,732
Gross Unrealized Losses		(12,771)
Fair Value		1,408,326
Held to Maturity
Amortized Cost	923,082	959,082
Gross Unrealized Gains	13,236	33,820
Gross Unrealized Losses	(3,562)	(447)
Fair Value	932,756	992,455
Total Available for Sale and Held to Maturity Investment Securities
Amortized Cost	2,653,608	2,360,447
Gross Unrealized Gains	23,435	53,552
Gross Unrealized Losses	(33,651)	(13,218)
Fair Value	2,643,392	2,400,781
U.S. Government sponsored agencies and enterprises
Available for Sale
Amortized Cost	5,087
Gross Unrealized Gains	0
Gross Unrealized Losses	(85)
Fair Value	5,002
Amortized Cost		23,013
Gross Unrealized Gains		3
Gross Unrealized Losses		(9)
Fair Value		23,007
States and political subdivisions
Available for Sale
Amortized Cost	335,034
Gross Unrealized Gains	8,928
Gross Unrealized Losses	(706)
Fair Value	343,256
Amortized Cost		363,813
Gross Unrealized Gains		15,998
Gross Unrealized Losses		(486)
Fair Value		379,325
Held to Maturity
Amortized Cost	899,865	878,400
Gross Unrealized Gains	12,991	32,559
Gross Unrealized Losses	(3,562)	(447)
Fair Value	$ 909,294	910,512
Total Available for Sale and Held to Maturity Investment Securities
Percentage of securities consisting general obligation issues	95.00%
Percentage of securities insured	27.00%
States and political subdivisions | State of Illinois | Securities Portfolio
Total Available for Sale and Held to Maturity Investment Securities
Percentage of investments issued by states and political subdivisions that were within the state of Illinois	20.00%
Residential mortgage-backed securities
Available for Sale
Amortized Cost	$ 1,344,270
Gross Unrealized Gains	1,209
Gross Unrealized Losses	(29,205)
Fair Value	1,316,274
Amortized Cost		861,594
Gross Unrealized Gains		3,035
Gross Unrealized Losses		(11,930)
Fair Value		852,699
Held to Maturity
Amortized Cost	23,217	80,682
Gross Unrealized Gains	245	1,261
Gross Unrealized Losses	0	0
Fair Value	23,462	81,943
Commercial mortgage-backed securities
Available for Sale
Amortized Cost	41,070
Gross Unrealized Gains	62
Gross Unrealized Losses	(92)
Fair Value	41,040
Amortized Cost		71,554
Gross Unrealized Gains		612
Gross Unrealized Losses		(131)
Fair Value		72,035
Corporate bonds
Available for Sale
Amortized Cost	5,065
Gross Unrealized Gains	0
Gross Unrealized Losses	(1)
Fair Value	$ 5,064
Amortized Cost		70,155
Gross Unrealized Gains		84
Gross Unrealized Losses		(42)
Fair Value		70,197
Equity securities
Available for Sale
Amortized Cost		11,236
Gross Unrealized Gains		0
Gross Unrealized Losses		(173)
Fair Value		$ 11,063

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Investment Securities - Unrealized Losses on Investment Securities and Fair Value of Related Securities (Details) $ in Thousands	Sep. 30, 2018 USD ($) Security_Position	Dec. 31, 2017 USD ($) Security_Position
Available for Sale
Less Than 12 Months, Fair Value	$ 819,508
Less Thank 12 Months, Fair Value		$ 308,494
Less Than 12 Months, Unrealized Losses	(12,120)
Less Than 12 Months, Unrealized Losses		(2,092)
12 Months or More, Fair Value	441,490
12 Months or More, Fair Value		450,524
12 Months or More, Unrealized Losses	(17,969)
12 Months or More, Unrealized Losses		(10,679)
Total Fair Value	1,260,998
Total Fair Value		759,018
Total Unrealized Losses	(30,089)
Total Unrealized Losses		(12,771)
Total
Less Than 12 Months, Fair Value	1,109,350	353,993
Less Than 12 Months, Unrealized Losses	(14,944)	(2,349)
12 Months or More, Fair Value	457,953	463,085
12 Months or More, Unrealized Losses	(18,707)	(10,869)
Total Fair Value	1,567,303	817,078
Total Unrealized Losses	$ (33,651)	$ (13,218)
Number of security positions in the investment portfolio in an unrealized loss position | Security_Position	761	471
U.S. Government sponsored agencies and enterprises
Available for Sale
Less Than 12 Months, Fair Value	$ 5,002
Less Thank 12 Months, Fair Value		$ 5,111
Less Than 12 Months, Unrealized Losses	(85)
Less Than 12 Months, Unrealized Losses		(9)
12 Months or More, Fair Value	0
12 Months or More, Fair Value		0
12 Months or More, Unrealized Losses	0
12 Months or More, Unrealized Losses		0
Total Fair Value	5,002
Total Fair Value		5,111
Total Unrealized Losses	(85)
Total Unrealized Losses		(9)
States and political subdivisions
Available for Sale
Less Than 12 Months, Fair Value	27,107
Less Thank 12 Months, Fair Value		9,016
Less Than 12 Months, Unrealized Losses	(140)
Less Than 12 Months, Unrealized Losses		(29)
12 Months or More, Fair Value	18,453
12 Months or More, Fair Value		18,754
12 Months or More, Unrealized Losses	(566)
12 Months or More, Unrealized Losses		(457)
Total Fair Value	45,560
Total Fair Value		27,770
Total Unrealized Losses	(706)
Total Unrealized Losses		(486)
Held to Maturity
Less Than 12 Months, Fair Value	289,842	45,499
Less Than 12 Months, Unrealized Losses	(2,824)	(257)
12 Months or More, Fair Value	16,463	12,561
12 Months or More, Unrealized Losses	(738)	(190)
Total Fair Value	306,305	58,060
Total Unrealized Losses	(3,562)	(447)
Residential mortgage-backed securities
Available for Sale
Less Than 12 Months, Fair Value	765,346
Less Thank 12 Months, Fair Value		256,769
Less Than 12 Months, Unrealized Losses	(11,848)
Less Than 12 Months, Unrealized Losses		(1,853)
12 Months or More, Fair Value	411,324
12 Months or More, Fair Value		407,224
12 Months or More, Unrealized Losses	(17,357)
12 Months or More, Unrealized Losses		(10,077)
Total Fair Value	1,176,670
Total Fair Value		663,993
Total Unrealized Losses	(29,205)
Total Unrealized Losses		(11,930)
Commercial mortgage-backed securities
Available for Sale
Less Than 12 Months, Fair Value	16,989
Less Thank 12 Months, Fair Value		19,483
Less Than 12 Months, Unrealized Losses	(46)
Less Than 12 Months, Unrealized Losses		(20)
12 Months or More, Fair Value	11,713
12 Months or More, Fair Value		14,583
12 Months or More, Unrealized Losses	(46)
12 Months or More, Unrealized Losses		(111)
Total Fair Value	28,702
Total Fair Value		34,066
Total Unrealized Losses	(92)
Total Unrealized Losses		(131)
Corporate bonds
Available for Sale
Less Than 12 Months, Fair Value	5,064
Less Thank 12 Months, Fair Value		7,052
Less Than 12 Months, Unrealized Losses	(1)
Less Than 12 Months, Unrealized Losses		(8)
12 Months or More, Fair Value	0
12 Months or More, Fair Value		9,963
12 Months or More, Unrealized Losses	0
12 Months or More, Unrealized Losses		(34)
Total Fair Value	5,064
Total Fair Value		17,015
Total Unrealized Losses	$ (1)
Total Unrealized Losses		(42)
Equity securities
Available for Sale
Less Thank 12 Months, Fair Value		11,063
Less Than 12 Months, Unrealized Losses		(173)
12 Months or More, Fair Value		0
12 Months or More, Unrealized Losses		0
Total Fair Value		11,063
Total Unrealized Losses		$ (173)

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Investment Securities - Net Gains (Losses) Recognized and Amortized Cost and Fair Value by Contractual Maturity of Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Realized gains	$ 42		$ 83	$ 192	$ 457
Realized losses	(127)		0	(537)	(6)
Net (losses) gains	(85)		$ 83	(345)	$ 451
Amortized Cost, Available for sale
Due in one year or less	44,036			44,036
Due after one year through five years	128,692			128,692
Due after five years through ten years	39,263			39,263
Due after ten years	133,195			133,195
Amortized Cost	1,730,526			1,730,526
Fair Value, Available for sale
Due in one year or less	44,350			44,350
Due after one year through five years	131,525			131,525
Due after five years through ten years	39,458			39,458
Due after ten years	137,989			137,989
Fair Value	1,710,636			1,710,636
Amortized Cost, Held to maturity
Due in one year or less	66,747			66,747
Due after one year through five years	150,122			150,122
Due after five years through ten years	230,783			230,783
Due after ten years	452,213			452,213
Investment securities held to maturity	923,082			923,082		$ 959,082
Fair value, Held to maturity
Due in one year or less	67,040			67,040
Due after one year through five years	154,149			154,149
Due after five years through ten years	234,855			234,855
Due after ten years	453,250			453,250
Fair Value	932,756			932,756		992,455
Total Available for Sale and Held to Maturity Investment Securities
Amortized Cost	2,653,608			2,653,608		2,360,447
Fair Value	2,643,392			2,643,392		2,400,781
Pledged financial instruments, not separately reported, securities	794,100			794,100		726,100
Pledged financial instruments, not separately reported, securities required to be pledged	710,400			710,400		625,200
Transfer of investment securities from held-to-maturity to available-for-sale		$ 2,600
Residential and commercial mortgage-backed securities
Amortized Cost, Available for sale
Amortized Cost	1,385,340			1,385,340
Fair Value, Available for sale
Fair Value	1,357,314			1,357,314
Residential mortgage-backed securities
Amortized Cost, Available for sale
Amortized Cost	1,344,270			1,344,270
Fair Value, Available for sale
Fair Value	1,316,274			1,316,274
Amortized Cost, Held to maturity
Investment securities held to maturity	23,217			23,217		80,682
Fair value, Held to maturity
Fair Value	$ 23,462			$ 23,462		$ 81,943

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Loans - Schedule of Composition of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Loans
Total loans, excluding purchased credit-impaired loans	$ 13,843,880	$ 13,846,318
Purchased credit-impaired loans	91,072	119,744
Total loans	13,934,952	13,966,062	$ 13,885,378
Commercial Portfolio Segment
Loans
Total loans, excluding purchased credit-impaired loans	4,936,536	4,786,180
Total loans	4,943,709		4,807,515
Commercial Portfolio Segment | Collateralized
Loans
Total loans, excluding purchased credit-impaired loans	2,065,588	2,113,135
Total loans	2,065,588		2,074,215
Commercial Real Estate Portfolio Segment | Real estate
Loans
Total loans, excluding purchased credit-impaired loans	3,832,032	4,147,529
Total loans	3,854,205		4,126,769
Commercial Real Estate Portfolio Segment | Construction real estate
Loans
Total loans, excluding purchased credit-impaired loans	548,882	406,849
Total loans	552,528		400,977
Commercial Real Estate Portfolio Segment | Other
Loans
Total loans, excluding purchased credit-impaired loans	895,748	964,326
Consumer Portfolio Segment | Real estate
Loans
Total loans, excluding purchased credit-impaired loans	1,403,087	1,432,458
Consumer Portfolio Segment | Indirect vehicle
Loans
Total loans, excluding purchased credit-impaired loans	790,573	667,928
Total loans	790,573		655,213
Consumer Portfolio Segment | Home equity
Loans
Total loans, excluding purchased credit-impaired loans	181,477	219,098
Total loans	190,476		239,926
Consumer Portfolio Segment | Other
Loans
Total loans, excluding purchased credit-impaired loans	85,705	$ 73,141
Total loans	$ 86,857		$ 79,097

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Loans - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) category	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Receivables [Abstract]
Number of highest rating categories by rating services company | category			1
Number of highest rating categories to be achieved for classification as investment grade companies | category			4
Financing Receivable, Allowance for Credit Losses [Line Items]
Percentage of collateral pledge of first mortgage loans as per agreement (minimum)	160.00%		160.00%
Percentage of collateral pledge of home equity loans as per agreement (minimum)	170.00%		170.00%
Percentage of collateral pledge of commercial real estate loans as per agreement (minimum)	157.00%		157.00%
Percentage of collateral pledge of outstanding advances from federal home loan bank as per agreement (minimum)	105.00%		105.00%
Loans pledged as collateral for long-term Federal Home Loan Bank advances	$ 3,900,000		$ 3,900,000		$ 4,700,000
Loans required to be pledged as collateral for long-term Federal Home Loan Bank advances	3,100,000		3,100,000		3,100,000
Loans pledged as collateral	859,000		859,000		902,200
Real estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans secured by owner-occupied properties	1,200,000		1,200,000
Provision	1,078	$ 935	7,046	$ 12,842
Purchased Credit-Impaired Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision			119
Allowance for loan losses and unfunded commitments write offs net of recoveries			(256)
Allowance for loan losses and unfunded commitments acquired with deteriorated credit quality	$ 1,300		$ 1,300		$ 1,200

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Loans - Contractual Aging of Recorded Investment in Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Contractual aging of the recorded investment in loans
Total loans, excluding covered loans	$ 13,843,880	$ 13,846,318
Total loans	13,934,952	13,966,062	$ 13,885,378
Non-performing loan aging
Contractual aging of the recorded investment in loans
Current	39,737	36,879
Past Due	33,994	39,929
Total loans	73,731	76,808
Non-performing loan aging | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,932	8,799
Non-performing loan aging | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	1,163	4,961
Non-performing loan aging | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	29,899	26,169
Purchased credit-impaired loans
Contractual aging of the recorded investment in loans
Current	53,843	63,937
Past Due	37,229	55,807
Total loans	91,072	119,744
Purchased credit-impaired loans | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,809	8,749
Purchased credit-impaired loans | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	3,904	3,997
Purchased credit-impaired loans | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	30,516	43,061
Total loans, excluding purchased credit-impaired loans
Contractual aging of the recorded investment in loans
Current	13,759,938	13,762,588
Past Due	83,942	83,730
Total loans, excluding covered loans	13,843,880	13,846,318
Total loans, excluding purchased credit-impaired loans | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	44,927	43,626
Total loans, excluding purchased credit-impaired loans | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	9,116	13,935
Total loans, excluding purchased credit-impaired loans | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	29,899	26,169
Total loans
Contractual aging of the recorded investment in loans
Current	13,813,781	13,826,525
Past Due	121,171	139,537
Total loans	13,934,952	13,966,062
Total loans | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	47,736	52,375
Total loans | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	13,020	17,932
Total loans | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	60,415	69,230
Commercial Portfolio Segment
Contractual aging of the recorded investment in loans
Current	4,927,393	4,769,244
Past Due	9,143	16,936
Total loans, excluding covered loans	4,936,536	4,786,180
Total loans	4,943,709		4,807,515
Commercial Portfolio Segment | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	3,487	1,702
Commercial Portfolio Segment | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	1,077	6,926
Commercial Portfolio Segment | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	4,579	8,308
Commercial Portfolio Segment | Collateralized
Contractual aging of the recorded investment in loans
Current	2,032,510	2,099,246
Past Due	33,078	13,889
Total loans, excluding covered loans	2,065,588	2,113,135
Total loans	2,065,588		2,074,215
Commercial Portfolio Segment | Collateralized | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	29,858	11,320
Commercial Portfolio Segment | Collateralized | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,458	1,878
Commercial Portfolio Segment | Collateralized | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	762	691
Commercial Real Estate Portfolio Segment | Health care
Contractual aging of the recorded investment in loans
Current	664,187	710,722
Past Due	269	0
Total loans, excluding covered loans	664,456	710,722
Commercial Real Estate Portfolio Segment | Health care | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	269	0
Commercial Real Estate Portfolio Segment | Health care | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Commercial Real Estate Portfolio Segment | Health care | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	0	0
Commercial Real Estate Portfolio Segment | Industrial
Contractual aging of the recorded investment in loans
Current	865,914	908,394
Past Due	2,811	755
Total loans, excluding covered loans	868,725	909,149
Commercial Real Estate Portfolio Segment | Industrial | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Commercial Real Estate Portfolio Segment | Industrial | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Commercial Real Estate Portfolio Segment | Industrial | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	2,811	755
Commercial Real Estate Portfolio Segment | Multifamily
Contractual aging of the recorded investment in loans
Current	503,597	601,844
Past Due	657	1,420
Total loans, excluding covered loans	504,254	603,264
Commercial Real Estate Portfolio Segment | Multifamily | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	128	688
Commercial Real Estate Portfolio Segment | Multifamily | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Commercial Real Estate Portfolio Segment | Multifamily | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	529	732
Commercial Real Estate Portfolio Segment | Retail
Contractual aging of the recorded investment in loans
Current	479,167	503,224
Past Due	1,232	474
Total loans, excluding covered loans	480,399	503,698
Commercial Real Estate Portfolio Segment | Retail | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	413	0
Commercial Real Estate Portfolio Segment | Retail | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Commercial Real Estate Portfolio Segment | Retail | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	819	474
Commercial Real Estate Portfolio Segment | Office
Contractual aging of the recorded investment in loans
Current	418,330	453,960
Past Due	120	2,410
Total loans, excluding covered loans	418,450	456,370
Commercial Real Estate Portfolio Segment | Office | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Commercial Real Estate Portfolio Segment | Office | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	956
Commercial Real Estate Portfolio Segment | Office | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	120	1,454
Commercial Real Estate Portfolio Segment | Other
Contractual aging of the recorded investment in loans
Current	887,428	956,181
Past Due	8,320	8,145
Total loans, excluding covered loans	895,748	964,326
Commercial Real Estate Portfolio Segment | Other | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,547	7,035
Commercial Real Estate Portfolio Segment | Other | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	175	76
Commercial Real Estate Portfolio Segment | Other | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	5,598	1,034
Commercial Real Estate Portfolio Segment | Construction real estate
Contractual aging of the recorded investment in loans
Current	548,882	404,595
Past Due	0	2,254
Total loans, excluding covered loans	548,882	406,849
Total loans	552,528		400,977
Commercial Real Estate Portfolio Segment | Construction real estate | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	2,254
Commercial Real Estate Portfolio Segment | Construction real estate | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Commercial Real Estate Portfolio Segment | Construction real estate | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	0	0
Consumer Portfolio Segment | Other
Contractual aging of the recorded investment in loans
Current	85,284	72,846
Past Due	421	295
Total loans, excluding covered loans	85,705	73,141
Total loans	86,857		79,097
Consumer Portfolio Segment | Other | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	169	202
Consumer Portfolio Segment | Other | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	113	36
Consumer Portfolio Segment | Other | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	139	57
Consumer Portfolio Segment | Residential real estate
Contractual aging of the recorded investment in loans
Current	1,388,338	1,410,473
Past Due	14,749	21,985
Total loans, excluding covered loans	1,403,087	1,432,458
Total loans	1,451,016		1,501,666
Consumer Portfolio Segment | Residential real estate | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	659	12,359
Consumer Portfolio Segment | Residential real estate | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,610	1,907
Consumer Portfolio Segment | Residential real estate | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	11,480	7,719
Consumer Portfolio Segment | Indirect vehicle
Contractual aging of the recorded investment in loans
Current	783,161	661,028
Past Due	7,412	6,900
Total loans, excluding covered loans	790,573	667,928
Total loans	790,573		655,213
Consumer Portfolio Segment | Indirect vehicle | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	4,747	4,905
Consumer Portfolio Segment | Indirect vehicle | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	1,847	1,083
Consumer Portfolio Segment | Indirect vehicle | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	818	912
Consumer Portfolio Segment | Home equity
Contractual aging of the recorded investment in loans
Current	175,747	210,831
Past Due	5,730	8,267
Total loans, excluding covered loans	181,477	219,098
Total loans	190,476		$ 239,926
Consumer Portfolio Segment | Home equity | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,650	3,161
Consumer Portfolio Segment | Home equity | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	836	1,073
Consumer Portfolio Segment | Home equity | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	$ 2,244	$ 4,033

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Loans - Recorded Investment in Non-Accrual Loans and Loans Past Due (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Contractual aging of the recorded investment in loans
Period past due of recorded investment in loans	90 days
Total loans
Contractual aging of the recorded investment in loans
Non-accrual	$ 72,437	$ 71,238
Loans past due 90 days or more and still accruing	1,294	5,570
Commercial Portfolio Segment
Contractual aging of the recorded investment in loans
Non-accrual	24,086	14,001
Loans past due 90 days or more and still accruing	0	3,500
Commercial Portfolio Segment | Collateralized
Contractual aging of the recorded investment in loans
Non-accrual	630	490
Loans past due 90 days or more and still accruing	662	531
Commercial Real Estate Portfolio Segment | Health care
Contractual aging of the recorded investment in loans
Non-accrual	0	0
Loans past due 90 days or more and still accruing	0	0
Commercial Real Estate Portfolio Segment | Industrial
Contractual aging of the recorded investment in loans
Non-accrual	2,811	8,807
Loans past due 90 days or more and still accruing	0	0
Commercial Real Estate Portfolio Segment | Multifamily
Contractual aging of the recorded investment in loans
Non-accrual	568	860
Loans past due 90 days or more and still accruing	0	0
Commercial Real Estate Portfolio Segment | Office
Contractual aging of the recorded investment in loans
Non-accrual	432	2,772
Loans past due 90 days or more and still accruing	0	0
Commercial Real Estate Portfolio Segment | Retail
Contractual aging of the recorded investment in loans
Non-accrual	819	590
Loans past due 90 days or more and still accruing	0	0
Commercial Real Estate Portfolio Segment | Other
Contractual aging of the recorded investment in loans
Non-accrual	5,887	8,016
Loans past due 90 days or more and still accruing	39	190
Commercial Real Estate Portfolio Segment | Construction real estate
Contractual aging of the recorded investment in loans
Non-accrual	0	0
Loans past due 90 days or more and still accruing	0	0
Consumer Portfolio Segment | Residential real estate
Contractual aging of the recorded investment in loans
Non-accrual	20,080	18,374
Loans past due 90 days or more and still accruing	381	1,210
Consumer Portfolio Segment | Indirect vehicle
Contractual aging of the recorded investment in loans
Non-accrual	4,051	3,019
Loans past due 90 days or more and still accruing	73	81
Consumer Portfolio Segment | Home equity
Contractual aging of the recorded investment in loans
Non-accrual	13,068	14,305
Loans past due 90 days or more and still accruing	0	0
Consumer Portfolio Segment | Other
Contractual aging of the recorded investment in loans
Non-accrual	5	4
Loans past due 90 days or more and still accruing	$ 139	$ 58

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Loans - Risk Category and Recorded Investment of Loans by Class (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Loans
Commercial related loans, excluding purchased credit-impaired loans	$ 11,383,038	$ 11,453,693
Non-performing substandard and doubtful loans	35,300	35,600
Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	10,833,428	10,997,156
Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	269,206	247,692
Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	280,404	208,845
Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Portfolio Segment
Loans
Commercial related loans, excluding purchased credit-impaired loans	4,936,536	4,786,180
Commercial Portfolio Segment | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	4,627,512	4,535,111
Commercial Portfolio Segment | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	161,909	147,232
Commercial Portfolio Segment | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	147,115	103,837
Commercial Portfolio Segment | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Portfolio Segment | Collateralized
Loans
Commercial related loans, excluding purchased credit-impaired loans	2,065,588	2,113,135
Commercial Portfolio Segment | Collateralized | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	2,051,164	2,095,668
Commercial Portfolio Segment | Collateralized | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	8,422	7,527
Commercial Portfolio Segment | Collateralized | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	6,002	9,940
Commercial Portfolio Segment | Collateralized | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Multifamily
Loans
Commercial related loans, excluding purchased credit-impaired loans	504,254	603,264
Commercial Real Estate Portfolio Segment | Multifamily | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	500,369	595,818
Commercial Real Estate Portfolio Segment | Multifamily | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	606	146
Commercial Real Estate Portfolio Segment | Multifamily | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	3,279	7,300
Commercial Real Estate Portfolio Segment | Multifamily | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Retail
Loans
Commercial related loans, excluding purchased credit-impaired loans	480,399	503,698
Commercial Real Estate Portfolio Segment | Retail | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	457,416	492,830
Commercial Real Estate Portfolio Segment | Retail | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	19,862	8,326
Commercial Real Estate Portfolio Segment | Retail | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	3,121	2,542
Commercial Real Estate Portfolio Segment | Retail | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Office
Loans
Commercial related loans, excluding purchased credit-impaired loans	418,450	456,370
Commercial Real Estate Portfolio Segment | Office | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	408,532	452,902
Commercial Real Estate Portfolio Segment | Office | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	1,964	696
Commercial Real Estate Portfolio Segment | Office | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	7,954	2,772
Commercial Real Estate Portfolio Segment | Office | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Construction real estate
Loans
Commercial related loans, excluding purchased credit-impaired loans	548,882	406,849
Commercial Real Estate Portfolio Segment | Construction real estate | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	546,012	406,849
Commercial Real Estate Portfolio Segment | Construction real estate | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	1,645	0
Commercial Real Estate Portfolio Segment | Construction real estate | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	1,225	0
Commercial Real Estate Portfolio Segment | Construction real estate | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Other
Loans
Commercial related loans, excluding purchased credit-impaired loans	895,748	964,326
Commercial Real Estate Portfolio Segment | Other | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	857,001	891,703
Commercial Real Estate Portfolio Segment | Other | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	10,463	37,682
Commercial Real Estate Portfolio Segment | Other | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	28,284	34,941
Commercial Real Estate Portfolio Segment | Other | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Health care
Loans
Commercial related loans, excluding purchased credit-impaired loans	664,456	710,722
Commercial Real Estate Portfolio Segment | Health care | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	544,562	640,751
Commercial Real Estate Portfolio Segment | Health care | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	49,515	33,672
Commercial Real Estate Portfolio Segment | Health care | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	70,379	36,299
Commercial Real Estate Portfolio Segment | Health care | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Industrial
Loans
Commercial related loans, excluding purchased credit-impaired loans	868,725	909,149
Commercial Real Estate Portfolio Segment | Industrial | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	840,860	885,524
Commercial Real Estate Portfolio Segment | Industrial | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	14,820	12,411
Commercial Real Estate Portfolio Segment | Industrial | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	13,045	11,214
Commercial Real Estate Portfolio Segment | Industrial | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Consumer Portfolio Segment
Loans
Commercial related loans, excluding purchased credit-impaired loans	2,460,842	2,392,625
Consumer Portfolio Segment | Performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	2,423,045	2,355,574
Consumer Portfolio Segment | Non-performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	37,797	37,051
Consumer Portfolio Segment | Residential real estate
Loans
Commercial related loans, excluding purchased credit-impaired loans	1,403,087	1,432,458
Consumer Portfolio Segment | Residential real estate | Performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	1,382,626	1,412,874
Consumer Portfolio Segment | Residential real estate | Non-performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	20,461	19,584
Consumer Portfolio Segment | Indirect vehicle
Loans
Commercial related loans, excluding purchased credit-impaired loans	790,573	667,928
Consumer Portfolio Segment | Indirect vehicle | Performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	786,449	664,828
Consumer Portfolio Segment | Indirect vehicle | Non-performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	4,124	3,100
Consumer Portfolio Segment | Home equity
Loans
Commercial related loans, excluding purchased credit-impaired loans	181,477	219,098
Consumer Portfolio Segment | Home equity | Performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	168,409	204,793
Consumer Portfolio Segment | Home equity | Non-performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	13,068	14,305
Consumer Portfolio Segment | Other
Loans
Commercial related loans, excluding purchased credit-impaired loans	85,705	73,141
Consumer Portfolio Segment | Other | Performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	85,561	73,079
Consumer Portfolio Segment | Other | Non-performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	$ 144	$ 62

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Loans - Loans Individually Evaluated for Impairment by Class of Loans (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Loans
Amount of mortgage loans in process of foreclosure	$ 53,700	$ 53,700	$ 43,600
Unpaid Principal Balance	105,641	105,641	92,635
Recorded Investment	79,032	79,032	86,970
Partial Charge-offs	26,609	26,609	5,665
Allowance for Loan Losses Allocated	4,390	4,390	10,414
Average Recorded Investment	82,462	75,481	73,282
Interest Income Recognized	310	709	904
Performing
Loans
Restructured loans	22,970	22,970	28,554
Non-performing
Loans
Restructured loans	23,959	23,959	30,836
Impaired financing receivable with no allowance | Commercial Portfolio Segment
Loans
Unpaid Principal Balance	35,407	35,407	8,312
Recorded Investment	14,641	14,641	7,771
Partial Charge-offs	20,766	20,766	541
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	17,634	10,430	5,595
Interest Income Recognized	222	222	95
Impaired financing receivable with no allowance | Commercial Portfolio Segment | Collateralized
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	301
Interest Income Recognized	0	0	0
Impaired financing receivable with no allowance | Commercial Real Estate Portfolio Segment | Health care
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Impaired financing receivable with no allowance | Commercial Real Estate Portfolio Segment | Industrial
Loans
Unpaid Principal Balance	3,426	3,426	0
Recorded Investment	2,811	2,811	0
Partial Charge-offs	615	615	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	3,491	1,176	1,260
Interest Income Recognized	0	0	8
Impaired financing receivable with no allowance | Commercial Real Estate Portfolio Segment | Multifamily
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	1,261
Interest Income Recognized	0	0	29
Impaired financing receivable with no allowance | Commercial Real Estate Portfolio Segment | Retail
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	814
Interest Income Recognized	0	0	27
Impaired financing receivable with no allowance | Commercial Real Estate Portfolio Segment | Office
Loans
Unpaid Principal Balance	0	0	527
Recorded Investment	0	0	527
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	1,426
Interest Income Recognized	0	0	18
Impaired financing receivable with no allowance | Commercial Real Estate Portfolio Segment | Other
Loans
Unpaid Principal Balance	0	0	10,597
Recorded Investment	0	0	10,597
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	1,096	2,312
Interest Income Recognized	0	52	128
Impaired financing receivable with no allowance | Commercial Real Estate Portfolio Segment | Construction real estate
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Impaired financing receivable with no allowance | Consumer Portfolio Segment | Real estate
Loans
Unpaid Principal Balance	3,847	3,847	1,950
Recorded Investment	3,809	3,809	1,912
Partial Charge-offs	38	38	38
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	2,260	3,261	483
Interest Income Recognized	0	0	0
Impaired financing receivable with no allowance | Consumer Portfolio Segment | Indirect vehicle
Loans
Unpaid Principal Balance	775	775	408
Recorded Investment	449	449	202
Partial Charge-offs	326	326	206
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	853	660	411
Interest Income Recognized	3	31	26
Impaired financing receivable with no allowance | Consumer Portfolio Segment | Home equity
Loans
Unpaid Principal Balance	79	79	81
Recorded Investment	79	79	81
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	79	27	376
Interest Income Recognized	0	0	0
Impaired financing receivable with no allowance | Consumer Portfolio Segment | Other consumer
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Impaired financing receivable with allowance | Commercial Portfolio Segment
Loans
Unpaid Principal Balance	7,996	7,996	7,418
Recorded Investment	7,996	7,996	7,418
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	797	797	2,315
Average Recorded Investment	8,559	6,147	7,668
Interest Income Recognized	85	182	277
Impaired financing receivable with allowance | Commercial Portfolio Segment | Collateralized
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	110	126
Interest Income Recognized	0	0	14
Impaired financing receivable with allowance | Commercial Real Estate Portfolio Segment | Health care
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	357	0
Interest Income Recognized	0	28	0
Impaired financing receivable with allowance | Commercial Real Estate Portfolio Segment | Industrial
Loans
Unpaid Principal Balance	0	0	8,339
Recorded Investment	0	0	8,317
Partial Charge-offs	0	0	22
Allowance for Loan Losses Allocated	0	0	2,669
Average Recorded Investment	0	2,126	3,215
Interest Income Recognized	0	8	171
Impaired financing receivable with allowance | Commercial Real Estate Portfolio Segment | Multifamily
Loans
Unpaid Principal Balance	0	0	568
Recorded Investment	0	0	568
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	320
Average Recorded Investment	0	0	426
Interest Income Recognized	0	0	0
Impaired financing receivable with allowance | Commercial Real Estate Portfolio Segment | Retail
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	1,345
Interest Income Recognized	0	0	28
Impaired financing receivable with allowance | Commercial Real Estate Portfolio Segment | Office
Loans
Unpaid Principal Balance	0	0	2,293
Recorded Investment	0	0	2,277
Partial Charge-offs	0	0	16
Allowance for Loan Losses Allocated	0	0	752
Average Recorded Investment	0	0	636
Interest Income Recognized	0	0	4
Impaired financing receivable with allowance | Commercial Real Estate Portfolio Segment | Other
Loans
Unpaid Principal Balance	4,766	4,766	0
Recorded Investment	4,766	4,766	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	438	438	0
Average Recorded Investment	4,894	3,032	29
Interest Income Recognized	0	124	0
Impaired financing receivable with allowance | Commercial Real Estate Portfolio Segment | Construction real estate
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Impaired financing receivable with allowance | Consumer Portfolio Segment | Real estate
Loans
Unpaid Principal Balance	19,604	19,604	21,380
Recorded Investment	17,591	17,591	19,014
Partial Charge-offs	2,013	2,013	2,366
Allowance for Loan Losses Allocated	1,621	1,621	2,158
Average Recorded Investment	17,590	18,496	17,616
Interest Income Recognized	0	32	25
Impaired financing receivable with allowance | Consumer Portfolio Segment | Indirect vehicle
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Impaired financing receivable with allowance | Consumer Portfolio Segment | Home equity
Loans
Unpaid Principal Balance	29,741	29,741	30,762
Recorded Investment	26,890	26,890	28,286
Partial Charge-offs	2,851	2,851	2,476
Allowance for Loan Losses Allocated	1,534	1,534	2,200
Average Recorded Investment	27,102	28,563	27,982
Interest Income Recognized	0	30	54
Impaired financing receivable with allowance | Consumer Portfolio Segment | Other consumer
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	$ 0	$ 0	$ 0

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Loans - Loans That Have Been Restructured (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) loan	Sep. 30, 2017 USD ($) loan	Sep. 30, 2018 USD ($) loan	Sep. 30, 2017 USD ($) loan
Restructured loans
Redefaulted loans			$ 0
Period past due of redefaulted loans			90 days
Performing
Restructured loans
Number of Loans | loan	2	6	3	24
Pre-Modification Recorded Investment	$ 223,000	$ 4,298,000	$ 311,000	$ 11,253,000
Post-Modification Recorded Investment	223,000	4,298,000	311,000	11,253,000
Charge-offs and Specific Reserves	$ 17,000	$ 1,000	$ 26,000	$ 515,000
Non-performing
Restructured loans
Number of Loans | loan	27	32	68	69
Pre-Modification Recorded Investment	$ 2,006,000	$ 2,943,000	$ 4,778,000	$ 7,885,000
Post-Modification Recorded Investment	2,006,000	2,943,000	4,778,000	7,885,000
Charge-offs and Specific Reserves	$ 575,000	$ 845,000	$ 1,565,000	$ 1,374,000
Commercial Portfolio Segment | Performing
Restructured loans
Number of Loans | loan				5
Pre-Modification Recorded Investment				$ 2,491,000
Post-Modification Recorded Investment				2,491,000
Charge-offs and Specific Reserves				$ 373,000
Commercial Portfolio Segment | Non-performing
Restructured loans
Number of Loans | loan	1		1	2
Pre-Modification Recorded Investment	$ 750,000		$ 750,000	$ 676,000
Post-Modification Recorded Investment	750,000		750,000	676,000
Charge-offs and Specific Reserves	$ 0		$ 0	$ 0
Commercial Real Estate Portfolio Segment | Performing | Office
Restructured loans
Number of Loans | loan				1
Pre-Modification Recorded Investment				$ 549,000
Post-Modification Recorded Investment				549,000
Charge-offs and Specific Reserves				$ 0
Commercial Real Estate Portfolio Segment | Performing | Other
Restructured loans
Number of Loans | loan		2		3
Pre-Modification Recorded Investment		$ 3,555,000		$ 3,703,000
Post-Modification Recorded Investment		3,555,000		3,703,000
Charge-offs and Specific Reserves		$ 0		$ 0
Commercial Real Estate Portfolio Segment | Performing | Retail
Restructured loans
Number of Loans | loan		2		2
Pre-Modification Recorded Investment		$ 337,000		$ 337,000
Post-Modification Recorded Investment		337,000		337,000
Charge-offs and Specific Reserves		$ 0		$ 0
Commercial Real Estate Portfolio Segment | Performing | Industrial
Restructured loans
Number of Loans | loan		1		3
Pre-Modification Recorded Investment		$ 387,000		$ 3,174,000
Post-Modification Recorded Investment		387,000		3,174,000
Charge-offs and Specific Reserves		$ 0		$ 0
Commercial Real Estate Portfolio Segment | Non-performing | Multifamily
Restructured loans
Number of Loans | loan				3
Pre-Modification Recorded Investment				$ 290,000
Post-Modification Recorded Investment				290,000
Charge-offs and Specific Reserves				$ 0
Commercial Real Estate Portfolio Segment | Non-performing | Retail
Restructured loans
Number of Loans | loan				1
Pre-Modification Recorded Investment				$ 906,000
Post-Modification Recorded Investment				906,000
Charge-offs and Specific Reserves				$ 0
Consumer Portfolio Segment | Performing | Residential real estate
Restructured loans
Number of Loans | loan	1		2	6
Pre-Modification Recorded Investment	$ 132,000		$ 220,000	$ 902,000
Post-Modification Recorded Investment	132,000		220,000	902,000
Charge-offs and Specific Reserves	$ 12,000		$ 21,000	$ 135,000
Consumer Portfolio Segment | Performing | Home equity
Restructured loans
Number of Loans | loan	1	1	1	4
Pre-Modification Recorded Investment	$ 91,000	$ 19,000	$ 91,000	$ 97,000
Post-Modification Recorded Investment	91,000	19,000	91,000	97,000
Charge-offs and Specific Reserves	$ 5,000	$ 1,000	$ 5,000	$ 7,000
Consumer Portfolio Segment | Non-performing | Residential real estate
Restructured loans
Number of Loans | loan	3	11	19	28
Pre-Modification Recorded Investment	$ 709,000	$ 2,775,000	$ 3,150,000	$ 5,155,000
Post-Modification Recorded Investment	709,000	2,775,000	3,150,000	5,155,000
Charge-offs and Specific Reserves	$ 246,000	$ 739,000	$ 1,184,000	$ 1,182,000
Consumer Portfolio Segment | Non-performing | Indirect vehicle
Restructured loans
Number of Loans | loan	21	20	41	31
Pre-Modification Recorded Investment	$ 151,000	$ 153,000	$ 272,000	$ 250,000
Post-Modification Recorded Investment	151,000	153,000	272,000	250,000
Charge-offs and Specific Reserves	$ 110,000	$ 105,000	$ 148,000	$ 134,000
Consumer Portfolio Segment | Non-performing | Home equity
Restructured loans
Number of Loans | loan	2	1	7	4
Pre-Modification Recorded Investment	$ 396,000	$ 15,000	$ 606,000	$ 608,000
Post-Modification Recorded Investment	396,000	15,000	606,000	608,000
Charge-offs and Specific Reserves	$ 219,000	$ 1,000	$ 233,000	$ 58,000

XML

Loans - Troubled Debt Restructuring Activity (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Performing
Financing Receivable, Modifications, Post Modification Recorded Investment [Roll Forward]
Beginning balance	$ 28,554
Additions	311
Charge-offs	0
Principal payments, net	(8,010)
Removals	(77)
Transfer to other real estate owned	0
Transfers in	2,970
Transfers out	(778)
Ending balance	22,970
Non-performing
Financing Receivable, Modifications, Post Modification Recorded Investment [Roll Forward]
Beginning balance	30,836
Additions	4,778
Charge-offs	(3,057)
Principal payments, net	(6,398)
Removals	(8)
Transfer to other real estate owned	0
Transfers in	778
Transfers out	(2,970)
Ending balance	$ 23,959

XML

Loans - Financing Receivable Modifications and Restructuring (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	$ 5,089
Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	2,390
Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	2,016
Delay in Payments and/or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	683
Commercial Portfolio Segment
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	750
Commercial Portfolio Segment | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Portfolio Segment | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	750
Commercial Portfolio Segment | Delay in Payments and/or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Consumer Portfolio Segment | Residential real estate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	3,370
Consumer Portfolio Segment | Residential real estate | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	2,097
Consumer Portfolio Segment | Residential real estate | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	862
Consumer Portfolio Segment | Residential real estate | Delay in Payments and/or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	411
Consumer Portfolio Segment | Indirect vehicle
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	272
Consumer Portfolio Segment | Indirect vehicle | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Consumer Portfolio Segment | Indirect vehicle | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Consumer Portfolio Segment | Indirect vehicle | Delay in Payments and/or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	272
Consumer Portfolio Segment | Home equity
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	697
Consumer Portfolio Segment | Home equity | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	293
Consumer Portfolio Segment | Home equity | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	404
Consumer Portfolio Segment | Home equity | Delay in Payments and/or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	$ 0

XML

Loans - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Allowance for credit losses:
Beginning balance			$ 157,710
Ending balance	$ 155,411		155,411
Unfunded Commitments
Allowance for unfunded credit commitments, Beginning balance	1,788	$ 2,264	1,698	$ 2,476
Allowance for unfunded commitments, Charge-Offs	0	0	0	0
Allowance for unfunded commitments, Recoveries	0	0	0	0
Allowance for unfunded commitments, Provision	220	12	310	(200)
Allowance for unfunded credit commitments, Ending balance	2,008	2,276	2,008	2,276
Allowance for credit losses
Allowance for credit losses, Beginning balance	164,578	156,297	159,408	141,842
Allowance for loan losses and unfunded commitments charge offs	31,600	2,830	45,138	9,124
Allowance for loan losses and unfunded commitments recoveries	2,938	3,420	7,919	10,736
Allowance for loan losses and unfunded commitments provision	21,503	4,517	35,230	17,950
Allowance for credit losses, Ending balance	157,419	161,404	157,419	161,404
Ending allowance balance attributable to loans:
Individually evaluated for impairment, Unfunded commitments	754	1,220	754	1,220
Individually evaluated for impairment, Total	5,144	8,403	5,144	8,403
Collectively evaluated for impairment, Unfunded commitments	1,254	1,056	1,254	1,056
Collectively evaluated for impairment, Total	150,960	152,015	150,960	152,015
Acquired and accounted for under ASC 310-30	1,315	986	1,315	986
Acquired and accounted for under ASC 310-30, Unfunded commitments	0	0	0	0
Loans:
Individually evaluated for impairment	79,032	70,749	79,032	70,749
Individually evaluated for impairment, Unfunded commitments	0	0	0	0
Collectively evaluated for impairment	13,764,848	13,682,710	13,764,848	13,682,710
Collectively evaluated for impairment, Unfunded commitments	0	0	0	0
Acquired and accounted for under ASC 310-30	91,072	131,919	91,072	131,919
Acquired and accounted for under ASC 310-30, Unfunded commitments	0	0	0	0
Total loans	13,934,952	13,885,378	13,934,952	13,885,378	$ 13,966,062
Total loans, Unfunded commitments	0	0	0	0
Commercial Portfolio Segment
Allowance for credit losses:
Beginning balance	40,318	43,783	46,267	44,661
Charge-offs	20,895	235	23,831	1,103
Recoveries	639	719	1,143	3,568
Provision	12,611	1,715	9,094	(1,144)
Ending balance	32,673	45,982	32,673	45,982
Ending allowance balance attributable to loans:
Individually evaluated for impairment	797	1,012	797	1,012
Collectively evaluated for impairment	31,638	44,879	31,638	44,879
Acquired and accounted for under ASC 310-30	238	91	238	91
Loans:
Individually evaluated for impairment	22,637	10,642	22,637	10,642
Collectively evaluated for impairment	4,913,899	4,783,196	4,913,899	4,783,196
Acquired and accounted for under ASC 310-30	7,173	13,677	7,173	13,677
Total loans	4,943,709	4,807,515	4,943,709	4,807,515
Commercial Portfolio Segment | Collateralized
Allowance for credit losses:
Beginning balance	13,095	12,765	13,007	12,238
Charge-offs	7,181	188	7,897	188
Recoveries	846		1,246	712
Provision	5,946	240	6,350	55
Ending balance	12,706	12,817	12,706	12,817
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0	585	0	585
Collectively evaluated for impairment	12,706	12,232	12,706	12,232
Acquired and accounted for under ASC 310-30		0		0
Loans:
Individually evaluated for impairment	0	921	0	921
Collectively evaluated for impairment	2,065,588	2,073,294	2,065,588	2,073,294
Acquired and accounted for under ASC 310-30	0	0	0	0
Total loans	2,065,588	2,074,215	2,065,588	2,074,215
Commercial Real Estate Portfolio Segment | Commercial real estate
Allowance for credit losses:
Beginning balance	65,391	63,247	63,429	51,807
Charge-offs	704	31	5,801	1,378
Recoveries	424	1,432	1,515	2,312
Provision	1,078	935	7,046	12,842
Ending balance	66,189	65,583	66,189	65,583
Ending allowance balance attributable to loans:
Individually evaluated for impairment	438	855	438	855
Collectively evaluated for impairment	64,710	63,868	64,710	63,868
Acquired and accounted for under ASC 310-30	1,041	860	1,041	860
Loans:
Individually evaluated for impairment	7,577	11,999	7,577	11,999
Collectively evaluated for impairment	3,824,455	4,082,707	3,824,455	4,082,707
Acquired and accounted for under ASC 310-30	22,173	32,063	22,173	32,063
Total loans	3,854,205	4,126,769	3,854,205	4,126,769
Commercial Real Estate Portfolio Segment | Construction real estate
Allowance for credit losses:
Beginning balance	26,792	15,263	15,501	14,758
Charge-offs	0		0
Recoveries	13	502	443	661
Provision	66	(707)	10,927	(361)
Ending balance	26,871	15,058	26,871	15,058
Ending allowance balance attributable to loans:
Individually evaluated for impairment		0		0
Collectively evaluated for impairment	26,835	15,023	26,835	15,023
Acquired and accounted for under ASC 310-30	36	35	36	35
Loans:
Individually evaluated for impairment	0	0	0	0
Collectively evaluated for impairment	548,882	395,794	548,882	395,794
Acquired and accounted for under ASC 310-30	3,646	5,183	3,646	5,183
Total loans	552,528	400,977	552,528	400,977
Consumer Portfolio Segment | Residential real estate
Allowance for credit losses:
Beginning balance	5,732	8,249	7,012	5,971
Charge-offs	76	541	805	901
Recoveries	121	38	217	624
Provision	(445)	94	(1,092)	2,146
Ending balance	5,332	7,840	5,332	7,840
Ending allowance balance attributable to loans:
Individually evaluated for impairment	1,621	2,169	1,621	2,169
Collectively evaluated for impairment	3,711	5,671	3,711	5,671
Acquired and accounted for under ASC 310-30		0		0
Loans:
Individually evaluated for impairment	21,400	19,370	21,400	19,370
Collectively evaluated for impairment	1,381,687	1,414,225	1,381,687	1,414,225
Acquired and accounted for under ASC 310-30	47,929	68,071	47,929	68,071
Total loans	1,451,016	1,501,666	1,451,016	1,501,666
Consumer Portfolio Segment | Indirect vehicle
Allowance for credit losses:
Beginning balance	4,738	3,963	4,728	3,421
Charge-offs	1,726	1,097	4,878	3,438
Recoveries	554	498	2,397	1,715
Provision	(486)	1,317	833	2,983
Ending balance	3,080	4,681	3,080	4,681
Ending allowance balance attributable to loans:
Individually evaluated for impairment		0		0
Collectively evaluated for impairment	3,080	4,681	3,080	4,681
Acquired and accounted for under ASC 310-30		0		0
Loans:
Individually evaluated for impairment	449	349	449	349
Collectively evaluated for impairment	790,124	654,864	790,124	654,864
Acquired and accounted for under ASC 310-30	0	0	0	0
Total loans	790,573	655,213	790,573	655,213
Consumer Portfolio Segment | Home equity
Allowance for credit losses:
Beginning balance	4,142	4,750	5,296	4,689
Charge-offs	724	439	972	873
Recoveries	261	149	559	724
Provision	2,111	422	907	342
Ending balance	5,790	4,882	5,790	4,882
Ending allowance balance attributable to loans:
Individually evaluated for impairment	1,534	2,562	1,534	2,562
Collectively evaluated for impairment	4,256	2,320	4,256	2,320
Acquired and accounted for under ASC 310-30		0		0
Loans:
Individually evaluated for impairment	26,969	27,468	26,969	27,468
Collectively evaluated for impairment	154,508	201,258	154,508	201,258
Acquired and accounted for under ASC 310-30	8,999	11,200	8,999	11,200
Total loans	190,476	239,926	190,476	239,926
Consumer Portfolio Segment | Other
Allowance for credit losses:
Beginning balance	2,582	2,013	2,470	1,821
Charge-offs	294	299	954	1,243
Recoveries	80	82	399	420
Provision	402	489	855	1,287
Ending balance	2,770	2,285	2,770	2,285
Ending allowance balance attributable to loans:
Individually evaluated for impairment		0		0
Collectively evaluated for impairment	2,770	2,285	2,770	2,285
Acquired and accounted for under ASC 310-30		0		0
Loans:
Individually evaluated for impairment	0	0	0	0
Collectively evaluated for impairment	85,705	77,372	85,705	77,372
Acquired and accounted for under ASC 310-30	1,152	1,725	1,152	1,725
Total loans	$ 86,857	$ 79,097	$ 86,857	$ 79,097

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Loans - Changes in the Accretable Yield (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Changes in the accretable yield for purchased credit-impaired loans
Balance at beginning of period	$ 8,241	$ 12,686	$ 12,069	$ 16,050
Purchases	0	0	0	43
Accretion	(2,579)	(4,315)	(7,213)	(9,334)
Other	236	3,453	1,042	5,065
Balance at end of period	$ 5,898	$ 11,824	$ 5,898	$ 11,824

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Loans - Carrying Amount of Loans Acquired (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Loans
Non covered loans	$ 925,400
Total acquired	938,379
Purchased Credit-Impaired Loans
Loans
Non covered loans	37,849
Total acquired	50,828
Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	887,551
Total acquired	887,551
Other Loans | Purchased Credit-Impaired Loans | Ginnie Mae
Loans
Consumer related purchased credit-impaired loans	40,200
Commercial Portfolio Segment
Loans
Non covered loans	129,803
Commercial Portfolio Segment | Purchased Credit-Impaired Loans
Loans
Non covered loans	7,173
Commercial Portfolio Segment | Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	122,630
Commercial Portfolio Segment | Collateralized
Loans
Non covered loans	14,114
Commercial Portfolio Segment | Collateralized | Purchased Credit-Impaired Loans
Loans
Non covered loans	0
Commercial Portfolio Segment | Collateralized | Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	14,114
Commercial Real Estate Portfolio Segment | Real estate
Loans
Non covered loans	558,524
Commercial Real Estate Portfolio Segment | Real estate | Purchased Credit-Impaired Loans
Loans
Non covered loans	22,173
Commercial Real Estate Portfolio Segment | Real estate | Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	536,351
Commercial Real Estate Portfolio Segment | Construction real estate
Loans
Non covered loans	5,264
Commercial Real Estate Portfolio Segment | Construction real estate | Purchased Credit-Impaired Loans
Loans
Non covered loans	3,646
Commercial Real Estate Portfolio Segment | Construction real estate | Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	1,618
Consumer Portfolio Segment | Consumer related
Loans
Covered loans	12,979
Non covered loans	217,695
Consumer Portfolio Segment | Consumer related | Purchased Credit-Impaired Loans
Loans
Covered loans	12,979
Non covered loans	4,857
Consumer Portfolio Segment | Consumer related | Purchased Non-Credit-Impaired Loans
Loans
Covered loans	0
Non covered loans	$ 212,838

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Goodwill and Intangibles - Additional Information (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Number of operating segments | segment				3
Goodwill	$ 999,925,000			$ 999,925,000		$ 1,003,548,000
Impairment	$ 0	$ 3,600,000	$ 0	$ 3,623,000	$ 0
Weighted average amortization period (in years)				12 years

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Goodwill and Intangibles - Changes In Carrying Amount of Goodwill (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Goodwill [Roll Forward]
Balance at beginning of period				$ 1,003,548,000
Impairment	$ 0	$ (3,600,000)	$ 0	(3,623,000)	$ 0
Balance at end of period	999,925,000			999,925,000
Banking
Goodwill [Roll Forward]
Balance at beginning of period				959,285,000
Impairment				0
Balance at end of period	959,285,000			959,285,000
Leasing
Goodwill [Roll Forward]
Balance at beginning of period				40,640,000
Impairment				0
Balance at end of period	40,640,000			40,640,000
Mortgage Banking
Goodwill [Roll Forward]
Balance at beginning of period				3,623,000
Impairment				(3,623,000)
Balance at end of period	$ 0			$ 0

XML

Goodwill and Intangibles - Changes in Core Deposit and Client Relationship Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018
Changes in the carrying amount of core deposit and client relationship intangibles
Balance at beginning of period			$ 54,766
Amortization expense	$ (1,854)	$ (2,038)	(5,652)	$ (6,214)
Balance at end of period	49,114		49,114
Gross carrying amount					$ 112,820
Accumulated amortization					(63,706)
Net book value	$ 49,114		$ 54,766		$ 49,114

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Goodwill and Intangibles - Estimated Future Amortization Expense (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2018	$ 1,799
2019	5,674
2020	5,022
2021	4,790
2022	3,806
Thereafter	28,023
Total estimated future amortization expense	$ 49,114

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Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Banking and Thrift [Abstract]
Demand deposit accounts, noninterest bearing	$ 6,036,012	$ 6,381,512
NOW, money market, and interest bearing deposits	5,125,330	4,954,765
Savings accounts	1,180,997	1,167,810
Certificates of deposit, $250,000 or more	1,375,549	1,506,071
Other certificates of deposit	990,905	948,220
Total deposits	14,708,793	14,958,378
Brokered deposits	$ 972,300	$ 1,100,000

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Short-Term Borrowings - Schedule of Short-Term Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Short-term borrowings
Weighted Average Interest Rate	1.71%	1.03%
Amount	$ 903,355	$ 861,039
Customer repurchase agreements
Short-term borrowings
Weighted Average Interest Rate	0.77%	0.27%
Amount	$ 311,605	$ 232,789
Federal Home Loan Bank advances
Short-term borrowings
Weighted Average Interest Rate	2.19%	1.31%
Amount	$ 500,000	$ 625,000
Federal funds purchased
Short-term borrowings
Weighted Average Interest Rate	2.35%	1.26%
Amount	$ 91,750	$ 3,250
Line of credit
Short-term borrowings
Weighted Average Interest Rate	0.00%	0.00%
Amount	$ 0	$ 0

XML

Short-Term Borrowings - Additional Information (Details) - USD ($)	Aug. 24, 2016	Dec. 18, 2015	Sep. 30, 2018	Dec. 31, 2017
Short-term borrowings
Fixed interest rate Federal Home Loan Bank advances			$ 500,000,000	$ 625,000,000
Short-term borrowings			903,355,000	861,039,000
London Interbank Offered Rate (LIBOR)
Short-term borrowings
Basis spread on variable rate	1.75%
Federal Home Loan Bank advances
Short-term borrowings
Short-term borrowings			$ 500,000,000	625,000,000
Federal Home Loan Bank advances | Minimum
Short-term borrowings
Effective interest rate of amounts due within one year			1.35%
Federal Home Loan Bank advances | Maximum
Short-term borrowings
Effective interest rate of amounts due within one year			2.42%
Line of credit
Short-term borrowings
Line of credit facility, maximum borrowing capacity		$ 35,000,000.0
Short-term borrowings			$ 0	$ 0
Line of credit | London Interbank Offered Rate (LIBOR)
Short-term borrowings
Basis spread on variable rate		1.75%

XML

Long-Term Borrowings (Details) - USD ($)	Nov. 16, 2017	Aug. 24, 2016	Sep. 30, 2018	Dec. 31, 2017
Long-term borrowings
Weighted Average Interest Rate			3.54%	2.97%
Amount			$ 451,677,000	$ 505,158,000
Federal Home Loan Bank advances			$ 198,900,000	$ 231,300,000
London Interbank Offered Rate (LIBOR)
Long-term borrowings
Basis spread on variable rate		1.75%
Federal Home Loan Bank advances
Long-term borrowings
Weighted Average Interest Rate			2.65%	1.73%
Amount			$ 198,939,000	$ 231,317,000
Federal Home Loan Bank advances | Minimum
Long-term borrowings
Interest rate			2.45%
Federal Home Loan Bank advances | Maximum
Long-term borrowings
Interest rate			5.87%
Notes payable
Long-term borrowings
Weighted Average Interest Rate			4.77%	4.14%
Amount			$ 79,675,000	$ 90,807,000
Subordinated notes, net of issuance costs
Long-term borrowings
Weighted Average Interest Rate			4.00%	4.00%
Amount			$ 173,063,000	$ 173,034,000
Debt instrument, face amount	$ 175,000,000.0
Debt instrument, stated interest rate	4.00%
Subordinated notes, net of issuance costs | London Interbank Offered Rate (LIBOR)
Long-term borrowings
Basis spread on variable rate	1.873%
Unsecured term
Long-term borrowings
Weighted Average Interest Rate			0.00%	3.31%
Amount		$ 16,000,000	$ 0	$ 10,000,000
Quarterly principal payments		$ 1,000,000
Notes payable to banks
Long-term borrowings
Weighted Average Interest Rate			4.73%
Amount			$ 76,500,000	76,300,000
Equipment pledged as collateral			$ 92,400,000	91,900,000
Notes payable to banks | Minimum
Long-term borrowings
Interest rate			2.25%
Notes payable to banks | Maximum
Long-term borrowings
Interest rate			7.25%
Other secured borrowings
Long-term borrowings
Weighted Average Interest Rate			5.70%
Amount			$ 3,200,000	$ 14,500,000

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Junior Subordinated Notes Issued to Capital Trusts (Details) - USD ($) $ in Thousands					3 Months Ended			9 Months Ended
	Sep. 17, 2018	Aug. 06, 2018	Mar. 19, 2018	Aug. 24, 2016	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Junior Subordinated Notes
Principal balance					$ 133,995			$ 133,995		$ 211,494
Investment Owned, Balance [Abstract]
Loss on extinguishment of debt					6,255		$ 0	$ 9,391	$ 0
Junior Subordinated Notes | Maximum
Investment Owned, Balance [Abstract]
Period for deferment of payment of interest on notes (in years)								5 years
London Interbank Offered Rate (LIBOR)
Junior Subordinated Notes
Basis spread on variable rate				1.75%
MB Financial Capital Trust II | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate								1.40%
Face Value					35,000			$ 35,000
MB Financial Capital Trust II | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance					36,083			$ 36,083
Basis spread on variable rate								1.40%
MB Financial Capital Trust III | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate								1.50%
Face Value					10,000			$ 10,000
MB Financial Capital Trust III | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance					10,310			$ 10,310
Basis spread on variable rate								1.50%
MB Financial Capital Trust IV | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate								1.52%
Face Value					20,000			$ 20,000
MB Financial Capital Trust IV | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance					20,619			$ 20,619
Basis spread on variable rate								1.52%
MB Financial Capital Trust V | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate								1.30%
Face Value					30,000			$ 30,000
MB Financial Capital Trust V | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance					30,928			$ 30,928
Basis spread on variable rate								1.30%
MB Financial Capital Trust VI | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate								1.30%
Face Value					22,500			$ 22,500
MB Financial Capital Trust VI | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance					23,196			$ 23,196
Basis spread on variable rate								1.30%
FOBB Statutory Trust III | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate								2.80%
Face Value					5,000			$ 5,000
FOBB Statutory Trust III | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance					5,155			$ 5,155
Basis spread on variable rate								2.80%
American Chartered Statutory Trust II
Investment Owned, Balance [Abstract]
Purchase accounting adjustments discount					2,600			$ 2,600
American Chartered Statutory Trust II | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate								2.75%
Face Value					10,000			$ 10,000
American Chartered Statutory Trust II | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance					10,310			$ 10,310
Basis spread on variable rate								2.75%
American Chartered Statutory Trust II | London Interbank Offered Rate (LIBOR) | Junior Subordinated Notes
Junior Subordinated Notes
Basis spread on variable rate								2.75%
American Chartered Statutory Trust I | Trust Preferred Securities
Junior Subordinated Notes
Face Value			$ 20,000
Investment Owned, Balance [Abstract]
Loss on extinguishment of debt						$ 3,100
American Chartered Statutory Trust I | London Interbank Offered Rate (LIBOR) | Junior Subordinated Notes
Junior Subordinated Notes
Basis spread on variable rate			3.60%
Coal City Capital Trust I | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate								1.80%
Face Value		$ 25,000
Investment Owned, Balance [Abstract]
Loss on extinguishment of debt					341
Coal City Capital Trust I | London Interbank Offered Rate (LIBOR) | Junior Subordinated Notes
Junior Subordinated Notes
Basis spread on variable rate		1.80%
TAYC Capital Trust II | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate								2.68%
Face Value	$ 40,000
Investment Owned, Balance [Abstract]
Loss on extinguishment of debt					$ 5,900
TAYC Capital Trust II | London Interbank Offered Rate (LIBOR) | Junior Subordinated Notes
Junior Subordinated Notes
Basis spread on variable rate	2.68%

XML

Commitments and Contingencies (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Commitments [Abstract]
Maximum maturity period for letters of credit (in years)	5 years
Increase (decrease) in maximum potential amount of future payments under letters of credit	$ 11,900
Dollar amount of letters of credit outstanding	175,100	$ 163,300
Letters of credit issued or renewed	116,700
Capital expenditure commitments outstanding	$ 1,900
State of Illinois | States and political subdivisions
Concentrations of credit risk
Concentration risk	20.00%
Home equity lines
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	$ 191,427	203,922
Other commitments
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	4,033,841	4,073,044
Standby
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	173,565	161,014
Commercial
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	$ 1,564	$ 2,248

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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value On A Recurring Basis (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	$ 1,710,636,000
Investment securities available for sale		$ 1,408,326,000
Marketable equity securities	10,901,000	0
Loans held for sale	51,834,000	548,578,000
Loans	13,843,880,000	13,846,318,000
Mortgage servicing rights	295,803,000	276,279,000
Derivative financial instruments	53,349,000	17,540,000
Derivative financial instruments	18,671,000	27,947,000
U.S. Government sponsored agencies and enterprises
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	5,002,000
Investment securities available for sale		23,007,000
States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	343,256,000
Investment securities available for sale		379,325,000
Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	1,316,274,000
Investment securities available for sale		852,699,000
Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	41,040,000
Investment securities available for sale		72,035,000
Corporate bonds
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	5,064,000
Investment securities available for sale		70,197,000
Equity securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		11,063,000
Recurring basis
Financial assets and financial liabilities measured at fair value on a recurring basis
Loans held for sale	51,834,000	548,578,000
Loans	42,363,000	40,531,000
Assets held in trust for deferred compensation	25,605,000	21,410,000
Other liabilities	25,605,000	21,410,000
Derivative financial instruments	59,309,000	40,296,000
Recurring basis | U.S. Government sponsored agencies and enterprises
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	5,002,000
Investment securities available for sale		23,007,000
Recurring basis | States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	343,256,000
Investment securities available for sale		379,325,000
Recurring basis | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	1,316,274,000
Investment securities available for sale		852,699,000
Recurring basis | Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	41,040,000
Investment securities available for sale		72,035,000
Recurring basis | Corporate bonds
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	5,064,000
Investment securities available for sale		70,197,000
Recurring basis | Equity securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		11,063,000
Marketable equity securities	10,901,000
Recurring basis | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Mortgage servicing rights	295,803,000	276,279,000
Recurring basis | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative financial instruments	58,196,000	31,499,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	0
Investment securities available for sale		11,063,000
Marketable equity securities	10,901,000
Loans held for sale	0	0
Loans	0	0
Assets held in trust for deferred compensation	25,605,000	21,410,000
Derivative financial instruments	198,000	389,000
Other liabilities	25,605,000	21,410,000
Derivative financial instruments	351,000	1,072,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government sponsored agencies and enterprises
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	0
Investment securities available for sale		0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	0
Investment securities available for sale		0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	0
Investment securities available for sale		0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	0
Investment securities available for sale		0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	0
Investment securities available for sale		0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		11,063,000
Marketable equity securities	10,901,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Mortgage servicing rights	0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative financial instruments	198,000	389,000
Recurring basis | Significant Other Observable Inputs (Level 2)
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	1,710,294,000
Investment securities available for sale		1,396,900,000
Marketable equity securities	0
Loans held for sale	51,834,000	548,578,000
Loans	42,363,000	40,531,000
Assets held in trust for deferred compensation	0	0
Derivative financial instruments	57,998,000	29,539,000
Other liabilities	0	0
Derivative financial instruments	58,726,000	39,224,000
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government sponsored agencies and enterprises
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	5,002,000
Investment securities available for sale		23,007,000
Recurring basis | Significant Other Observable Inputs (Level 2) | States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	342,927,000
Investment securities available for sale		378,996,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	1,316,261,000
Investment securities available for sale		852,665,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	41,040,000
Investment securities available for sale		72,035,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate bonds
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	5,064,000
Investment securities available for sale		70,197,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Equity securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		0
Marketable equity securities	0
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Mortgage servicing rights	0	0
Recurring basis | Significant Other Observable Inputs (Level 2) | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative financial instruments	57,998,000	29,539,000
Recurring basis | Significant Unobservable Inputs (Level 3)
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	342,000
Investment securities available for sale		363,000
Marketable equity securities	0
Loans held for sale	0	0
Loans	0	0
Assets held in trust for deferred compensation	0	0
Derivative financial instruments	0	1,571,000
Other liabilities	0	0
Derivative financial instruments	232,000	0
Recurring basis | Significant Unobservable Inputs (Level 3) | U.S. Government sponsored agencies and enterprises
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	0
Investment securities available for sale		0
Recurring basis | Significant Unobservable Inputs (Level 3) | States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	329,000
Investment securities available for sale		329,000
Recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	13,000
Investment securities available for sale		34,000
Recurring basis | Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	0
Investment securities available for sale		0
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate bonds
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	0
Investment securities available for sale		0
Recurring basis | Significant Unobservable Inputs (Level 3) | Equity securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		0
Marketable equity securities	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Mortgage servicing rights	295,803,000	276,279,000
Recurring basis | Significant Unobservable Inputs (Level 3) | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative financial instruments	$ 0	$ 1,571,000

XML

Fair Value Measurements - Unobservable Inputs Used In Fair Value Measurement (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	$ 1,710,636,000
Investment securities available for sale		$ 1,408,326,000
Mortgage servicing rights	295,803,000	276,279,000
Derivative financial instruments	53,349,000	17,540,000
Significant Unobservable Inputs (Level 3) | Recurring basis
Financial assets and financial liabilities measured at fair value on a recurring basis
Fair Value	342,000
Investment securities available for sale		363,000
Derivative financial instruments	$ 0	$ 1,571,000
Discounted cash flows | Credit assumption | Significant Unobservable Inputs (Level 3) | Recurring basis | States and political subdivisions | Minimum
Financial assets and financial liabilities measured at fair value on a recurring basis
Debt securities, available for sale, measurement input	0.40	0.40
Discounted cash flows | Credit assumption | Significant Unobservable Inputs (Level 3) | Recurring basis | States and political subdivisions | Maximum
Financial assets and financial liabilities measured at fair value on a recurring basis
Debt securities, available for sale, measurement input	0.45	0.45
Discounted cash flows | Constant pre-payment rates (CPR) | Significant Unobservable Inputs (Level 3) | Recurring basis | Residential mortgage-backed securities | Minimum
Financial assets and financial liabilities measured at fair value on a recurring basis
Debt securities, available for sale, measurement input	0.01	0.01
Discounted cash flows | Constant pre-payment rates (CPR) | Significant Unobservable Inputs (Level 3) | Recurring basis | Residential mortgage-backed securities | Maximum
Financial assets and financial liabilities measured at fair value on a recurring basis
Debt securities, available for sale, measurement input	0.03	0.03
Discounted cash flows | Constant pre-payment rates (CPR) | Significant Unobservable Inputs (Level 3) | Recurring basis | Mortgage servicing rights | Minimum
Financial assets and financial liabilities measured at fair value on a recurring basis
Servicing asset, measurement input	0.0620	0.067
Discounted cash flows | Constant pre-payment rates (CPR) | Significant Unobservable Inputs (Level 3) | Recurring basis | Mortgage servicing rights | Maximum
Financial assets and financial liabilities measured at fair value on a recurring basis
Servicing asset, measurement input	0.0660	0.078
Discounted cash flows | Discount rate | Significant Unobservable Inputs (Level 3) | Recurring basis | Mortgage servicing rights | Minimum
Financial assets and financial liabilities measured at fair value on a recurring basis
Servicing asset, measurement input	0.0953	0.0953
Discounted cash flows | Discount rate | Significant Unobservable Inputs (Level 3) | Recurring basis | Mortgage servicing rights | Maximum
Financial assets and financial liabilities measured at fair value on a recurring basis
Servicing asset, measurement input	0.1108	0.1106
Discounted cash flows | Maturity (months) | Significant Unobservable Inputs (Level 3) | Recurring basis | Mortgage servicing rights | Minimum
Financial assets and financial liabilities measured at fair value on a recurring basis
Servicing asset, term	327 months	324 months
Discounted cash flows | Maturity (months) | Significant Unobservable Inputs (Level 3) | Recurring basis | Mortgage servicing rights | Maximum
Financial assets and financial liabilities measured at fair value on a recurring basis
Servicing asset, term	358 months	358 months
Discounted cash flows | Delinquency rate | Significant Unobservable Inputs (Level 3) | Recurring basis | Mortgage servicing rights | Minimum
Financial assets and financial liabilities measured at fair value on a recurring basis
Servicing asset, measurement input	0.0232	0.0242
Discounted cash flows | Delinquency rate | Significant Unobservable Inputs (Level 3) | Recurring basis | Mortgage servicing rights | Maximum
Financial assets and financial liabilities measured at fair value on a recurring basis
Servicing asset, measurement input	0.0484	0.0530
Discounted cash flows | Costs to service | Significant Unobservable Inputs (Level 3) | Recurring basis | Mortgage servicing rights | Minimum
Financial assets and financial liabilities measured at fair value on a recurring basis
Servicing asset, measurement inputs, value	$ 67	$ 67
Discounted cash flows | Costs to service | Significant Unobservable Inputs (Level 3) | Recurring basis | Mortgage servicing rights | Maximum
Financial assets and financial liabilities measured at fair value on a recurring basis
Servicing asset, measurement inputs, value	227	227
Discounted cash flows | Additive delinquent costs to service | Significant Unobservable Inputs (Level 3) | Recurring basis | Mortgage servicing rights | Minimum
Financial assets and financial liabilities measured at fair value on a recurring basis
Servicing asset, measurement inputs, value	175	175
Discounted cash flows | Additive delinquent costs to service | Significant Unobservable Inputs (Level 3) | Recurring basis | Mortgage servicing rights | Maximum
Financial assets and financial liabilities measured at fair value on a recurring basis
Servicing asset, measurement inputs, value	$ 1,000	$ 1,000
Sales cash flows | Expected closing ratio | Significant Unobservable Inputs (Level 3) | Recurring basis | Derivative financial instruments | Minimum
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative instrument, measurement input	0.70	0.70
Sales cash flows | Expected closing ratio | Significant Unobservable Inputs (Level 3) | Recurring basis | Derivative financial instruments | Maximum
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative instrument, measurement input	0.95	0.95
Sales cash flows | Expected delivery price | Significant Unobservable Inputs (Level 3) | Recurring basis | Derivative financial instruments | Minimum
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative instrument, measurement input	0.009945	0.009738
Sales cash flows | Expected delivery price | Significant Unobservable Inputs (Level 3) | Recurring basis | Derivative financial instruments | Maximum
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative instrument, measurement input	0.010456	0.010687

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Fair Value Measurements - Assumptions Used In Measuring Fair Value of Mortgage Servicing Rights (Details) - Mortgage servicing rights	9 Months Ended
	Sep. 30, 2018 USD ($)
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Impact on fair value of 10% adverse change, CPR	$ (8,430,000)
Impact on fair value of 20% adverse change, CPR	(16,451,000)
Impact on fair value of 10% adverse change, discount rate	(12,623,000)
Impact on fair value of 20% adverse change, discount rate	(24,232,000)
Impact on fair value of 10% adverse change, delinquency rate	(3,098,000)
Impact on fair value of 20% adverse change, delinquency rate	(5,299,000)
Impact on fair value of 10% adverse change, costs to service	(5,475,000)
Impact on fair value of 20% adverse change, costs to service	$ (10,949,000)
Weighted average
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Weighted average CPR	6.40%
Weighted average discount rate	9.84%
Weighted average delinquency rate	4.58%
Weighted average costs to service	$ 91.00

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Fair Value Measurements - Level 3 Financial Assets Measured at Fair Value (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Investment Securities
Financial assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance, beginning of period	$ 363	$ 544
Purchases	0	0
Originations	0	0
Included in earnings	0	0
Principal payments	(21)	(106)
Sales	0	0
Balance, ending of period	342	438
Mortgage Servicing Rights
Financial assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance, beginning of period	276,279	238,011
Purchases	161	839
Originations	30,086	43,197
Included in earnings	(10,723)	(20,601)
Principal payments	0	0
Sales	0	0
Balance, ending of period	295,803	261,446
Derivatives
Financial assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance, beginning of period	1,571	3,160
Purchases	0	0
Originations	0	0
Included in earnings	(1,571)	(1,221)
Principal payments	0	0
Sales	0	0
Balance, ending of period	$ 0	$ 1,939

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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Estimated fair values of financial instruments
Derivative financial instruments	$ 18,671	$ 27,947
Fair value assumption, allowance for impaired real estate loans percentage	100.00%
Maximum maturity period of short-term borrowings where carrying value approximates fair value (in days)	90 days
Minimum maturity period of short-term borrowings where fair value is based on discounted value of contractual cash flows (in days)	90 days
Recurring basis
Estimated fair values of financial instruments
Derivative financial instruments	$ 59,309	40,296
Recurring basis | Significant Unobservable Inputs (Level 3)
Estimated fair values of financial instruments
Derivative financial instruments	$ 232	$ 0

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Fair Value Measurements - Assets Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring basis - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financial Assets:
Impaired loans	$ 69,721	$ 60,569
Foreclosed assets	14,464	15,113
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets:
Impaired loans	0	0
Foreclosed assets	0	0
Significant Other Observable Inputs (Level 2)
Financial Assets:
Impaired loans	0	0
Foreclosed assets	0	0
Significant Unobservable Inputs (Level 3)
Financial Assets:
Impaired loans	69,721	60,569
Foreclosed assets	$ 14,464	$ 15,113
Significant Unobservable Inputs (Level 3) | Minimum
Financial Assets:
Appraisal adjustment impaired loans (as a percent)	5.00%	5.00%
Appraisal adjustment foreclosed assets (as a percent)	5.00%	5.00%
Significant Unobservable Inputs (Level 3) | Maximum
Financial Assets:
Appraisal adjustment impaired loans (as a percent)	10.00%	10.00%
Appraisal adjustment foreclosed assets (as a percent)	10.00%	10.00%

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Fair Value Measurements - Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financial Assets:
Cash and due from banks	$ 342,933	$ 397,880
Interest earning deposits with banks	87,740	181,341
Investment securities available for sale	1,710,636
Investment securities available for sale		1,408,326
Investment securities held to maturity	932,756	992,455
Marketable equity securities	10,901	0
Non-marketable securities - FHLB and FRB stock	107,407	114,111
Loans held for sale	51,834	548,578
Derivative financial instruments	53,349	17,540
Financial Liabilities:
Non-interest bearing deposits	6,036,012	6,381,512
Interest bearing deposits	8,672,781	8,576,866
Short-term borrowings	903,355	861,039
Junior subordinated notes issued to capital trusts	133,995	211,494
Derivative financial instruments	18,671	27,947
Recurring basis
Financial Assets:
Loans held for sale	51,834	548,578
Financial Liabilities:
Derivative financial instruments	59,309	40,296
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets:
Cash and due from banks	342,933	397,880
Interest earning deposits with banks	87,740	181,341
Investment securities available for sale	0
Investment securities available for sale		11,063
Investment securities held to maturity	0	0
Marketable equity securities	10,901
Non-marketable securities - FHLB and FRB stock	0	0
Loans held for sale	0	0
Loans, net	0	0
Accrued interest receivable	66,122	63,589
Derivative financial instruments	198	389
Financial Liabilities:
Non-interest bearing deposits	6,036,012	6,381,512
Interest bearing deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Junior subordinated notes issued to capital trusts	0	0
Accrued interest payable	8,962	6,458
Derivative financial instruments	351	1,072
Recurring basis | Significant Other Observable Inputs (Level 2)
Financial Assets:
Cash and due from banks	0	0
Interest earning deposits with banks	0	0
Investment securities available for sale	1,710,294
Investment securities available for sale		1,396,900
Investment securities held to maturity	932,756	992,455
Marketable equity securities	0
Non-marketable securities - FHLB and FRB stock	0	0
Loans held for sale	51,834	548,578
Loans, net	42,362	40,531
Accrued interest receivable	0	0
Derivative financial instruments	57,998	29,539
Financial Liabilities:
Non-interest bearing deposits	0	0
Interest bearing deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Junior subordinated notes issued to capital trusts	0	0
Accrued interest payable	0	0
Derivative financial instruments	58,726	39,224
Recurring basis | Significant Unobservable Inputs (Level 3)
Financial Assets:
Cash and due from banks	0	0
Interest earning deposits with banks	0	0
Investment securities available for sale	342
Investment securities available for sale		363
Investment securities held to maturity	0	0
Marketable equity securities	0
Non-marketable securities - FHLB and FRB stock	107,407	114,111
Loans held for sale	0	0
Loans, net	13,794,083	13,947,861
Accrued interest receivable	0	0
Derivative financial instruments	0	1,571
Financial Liabilities:
Non-interest bearing deposits	0	0
Interest bearing deposits	8,659,683	8,569,368
Short-term borrowings	903,232	860,676
Long-term borrowings	451,620	513,725
Junior subordinated notes issued to capital trusts	108,394	170,965
Accrued interest payable	0	0
Derivative financial instruments	232	0
Carrying Amount
Financial Assets:
Cash and due from banks	342,933	397,880
Interest earning deposits with banks	87,740	181,341
Investment securities available for sale	1,710,636
Investment securities available for sale		1,408,326
Investment securities held to maturity	923,082	959,082
Marketable equity securities	10,901
Non-marketable securities - FHLB and FRB stock	107,407	114,111
Loans held for sale	51,834	548,578
Loans, net	13,779,541	13,808,352
Accrued interest receivable	66,122	63,589
Derivative financial instruments	58,196	31,499
Financial Liabilities:
Non-interest bearing deposits	6,036,012	6,381,512
Interest bearing deposits	8,672,781	8,576,866
Short-term borrowings	903,355	861,039
Long-term borrowings	451,677	505,158
Junior subordinated notes issued to capital trusts	133,995	211,494
Accrued interest payable	8,962	6,458
Derivative financial instruments	59,309	40,296
Estimated Fair Value
Financial Assets:
Cash and due from banks	342,933	397,880
Interest earning deposits with banks	87,740	181,341
Investment securities available for sale	1,710,636
Investment securities available for sale		1,408,326
Investment securities held to maturity	932,756	992,455
Marketable equity securities	10,901
Non-marketable securities - FHLB and FRB stock	107,407	114,111
Loans held for sale	51,834	548,578
Loans, net	13,836,445	13,988,392
Accrued interest receivable	66,122	63,589
Derivative financial instruments	58,196	31,499
Financial Liabilities:
Non-interest bearing deposits	6,036,012	6,381,512
Interest bearing deposits	8,659,683	8,569,368
Short-term borrowings	903,232	860,676
Long-term borrowings	451,620	513,725
Junior subordinated notes issued to capital trusts	108,394	170,965
Accrued interest payable	8,962	6,458
Derivative financial instruments	$ 59,309	$ 40,296

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Stock Incentive Plans - Impact of Share-Based Payment Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Total compensation expense for share-based payment plans during the period	$ 4,542	$ 4,393	$ 13,688	$ 13,317
Amount of related income tax benefit recognized in income	$ 1,507	$ 2,175	$ 5,460	$ 8,513

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Stock Incentive Plans - Additional Information (Details) - USD ($) $ in Millions			9 Months Ended		12 Months Ended
	Aug. 18, 2014	May 28, 2014	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock-based compensation
Grants beyond threshold limit count numerator (in shares)		2
Omnibus Incentive Plan
Stock-based compensation
Additional number of share authorized (in shares)		3,100,000
Total number of shares authorized (in shares)		11,400,000
Percentage of shares authorized for issuance		10.00%
Vesting period		3 years
Shares available for future grant (in shares)			2,131,433
Unrecognized compensation cost related to nonvested share-based compensation			$ 26.1
Period for recognition			2 years
Omnibus Incentive Plan | Taylor Capital Group, Inc.
Stock-based compensation
Total number of shares authorized (in shares)	13,800,000
Increase in amount of shares authorized (in shares)	2,400,000
Stock options
Stock-based compensation
Award requisite service period			4 years
Expiration term of options			10 years
Intrinsic value of options exercised			$ 9.7	$ 5.2
Stock options | Director
Stock-based compensation
Vesting period			5 years
Maximum percentage of directors fees with option to be received in equity based incentive awards			70.00%
Period of restriction for sale of shares vested			6 months
Restricted shares
Stock-based compensation
Intrinsic value of restricted shares that vested			$ 13.4	$ 17.4
Restricted shares | Minimum
Stock-based compensation
Vesting period			2 years
Restricted shares | Maximum
Stock-based compensation
Vesting period			4 years
Restricted stock | Director
Stock-based compensation
Vesting period			1 year
Maximum percentage of directors fees with option to be received in equity based incentive awards			100.00%
Performance-based restricted stock units
Stock-based compensation
Vesting period			3 years
Restricted stock issued (in shares)			71,567		65,476	80,780	71,560
Performance based restricted units performance period			3 years
Shares that have been vested, issued (in shares)			0
Share based compensation restricted stock units multiplier			100.00%
Performance-based restricted stock units | Minimum
Stock-based compensation
Percentage of shares earned to number of units issued			0.00%
Performance-based restricted stock units | Maximum
Stock-based compensation
Percentage of shares earned to number of units issued			175.00%

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Stock Incentive Plans - Summary of Impact of Share-Based Payment Plans (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Number of Options
Outstanding, beginning balance (in shares)	1,721,978
Granted (in shares)	167,457
Exercised (in shares)	(445,268)
Expired (in shares)	(2,293)
Forfeited or cancelled (in shares)	(24,031)
Outstanding, ending balance (in shares)	1,417,843	1,721,978
Options exercisable (in shares)	928,013
Weighted Average Exercise Price
Outstanding, beginning balance (in dollars per share)	$ 29.10
Granted (in dollars per share)	41.34
Exercised (in dollars per share)	26.36
Expired (in dollars per share)	33.08
Forfeited or cancelled (in dollars per share)	30.56
Outstanding, ending balance (in dollars per share)	31.37	$ 29.10
Options exercisable (in dollars per share)	$ 28.46
Weighted Average Remaining Contractual Term (In Years)
Outstanding, balance (in years)	5 years 11 months 2 days	5 years 2 months 10 days
Options exercisable (in years)	4 years 9 months 10 days
Aggregate Intrinsic Value (in thousands)
Options outstanding	$ 20,908
Options exercisable	$ 16,393

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Stock Incentive Plans - Assumptions Used For Options Granted (Details) - Stock options	9 Months Ended
	Sep. 30, 2018 $ / shares
Fair value assumptions
Risk-free interest rate	2.80%
Expected volatility of Company’s stock	25.90%
Expected dividend yield	2.06%
Expected life of options	5 years 8 months
Weighted average fair value per option of options granted during the year (in dollars per share)	$ 9.45

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Stock Incentive Plans - Changes in Restricted Shares and Units (Details) - Restricted shares	9 Months Ended
	Sep. 30, 2018 $ / shares shares
Number of Shares and Units
Shares and units outstanding, beginning balance (in shares) | shares	973,201
Granted (in shares) | shares	427,939
Vested (in shares) | shares	(316,639)
Forfeited or cancelled (in shares) | shares	(108,293)
Shares and units outstanding, ending balance (in shares) | shares	976,208
Weighted Average Grant Date Fair Value
Shares and units outstanding, beginning balance (in dollars per share) | $ / shares	$ 37.03
Granted (in dollars per share) | $ / shares	41.66
Vested (in dollars per share) | $ / shares	34.73
Forfeited or cancelled (in dollars per share) | $ / shares	35.74
Shares and units outstanding, ending balance (in dollars per share) | $ / shares	$ 39.95

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Derivative Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Net amount payable under interest rate swap	$ 1	$ 1
Interest rate swap credit risk exposure	17,700
Derivative liability, notional amount	2,684,357	$ 3,591,647
Commercial loan interest rate swaps
Derivatives, Fair Value [Line Items]
Derivative liability, notional amount	$ 18

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Derivative Financial Instruments - Summary of Derivative Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Derivative [Line Items]
Asset Derivatives, Notional Amount	$ 2,571,769		$ 2,571,769		$ 3,142,730
Asset Derivatives, Estimated Fair Value	58,196		58,196		31,499
Liability Derivatives, Notional Amount	2,684,357		2,684,357		3,591,647
Liability Derivatives, Estimated Fair Value	(59,309)		(59,309)		(40,296)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives	(373)	$ (7,790)	3,675	$ (13,090)
Derivative instruments designated as hedges of fair value | Interest rate swap contracts
Derivative [Line Items]
Asset Derivatives, Notional Amount	0		0		0
Asset Derivatives, Estimated Fair Value	0		0		0
Liability Derivatives, Notional Amount	18		18		58
Liability Derivatives, Estimated Fair Value	(1)		(1)		(1)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives	0	0	1	2
Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	2,571,769		2,571,769		3,142,730
Asset Derivatives, Estimated Fair Value	58,196		58,196		31,499
Liability Derivatives, Notional Amount	2,684,339		2,684,339		3,591,589
Liability Derivatives, Estimated Fair Value	(59,308)		(59,308)		(40,295)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives	(373)	(7,790)	3,674	(13,092)
Stand-alone derivative instruments | Interest rate swap contracts
Derivative [Line Items]
Asset Derivatives, Notional Amount	1,713,998		1,713,998		1,563,109
Asset Derivatives, Estimated Fair Value	38,624		38,624		21,217
Liability Derivatives, Notional Amount	1,713,998		1,713,998		1,563,109
Liability Derivatives, Estimated Fair Value	(38,624)		(38,624)		(21,217)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives	617	3,276	4,245	6,749
Stand-alone derivative instruments | Interest rate swap contracts | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	225,000		225,000		458,000
Asset Derivatives, Estimated Fair Value	12,661		12,661		4,479
Liability Derivatives, Notional Amount	275,000		275,000		1,008,000
Liability Derivatives, Estimated Fair Value	(13,472)		(13,472)		(14,360)
Stand-alone derivative instruments | Interest rate options contracts
Derivative [Line Items]
Asset Derivatives, Notional Amount	506,760		506,760		372,927
Asset Derivatives, Estimated Fair Value	4,324		4,324		1,887
Liability Derivatives, Notional Amount	506,760		506,760		372,927
Liability Derivatives, Estimated Fair Value	(4,324)		(4,324)		(1,887)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives	0	0	0	0
Stand-alone derivative instruments | Foreign exchange contracts
Derivative [Line Items]
Asset Derivatives, Notional Amount	52,175		52,175		40,713
Asset Derivatives, Estimated Fair Value	2,354		2,354		1,934
Liability Derivatives, Notional Amount	70,111		70,111		34,029
Liability Derivatives, Estimated Fair Value	(2,298)		(2,298)		(1,759)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives	(83)	(70)	172	190
Stand-alone derivative instruments | Spot foreign exchange contracts
Derivative [Line Items]
Asset Derivatives, Notional Amount	13,036		13,036		1,424
Asset Derivatives, Estimated Fair Value	35		35		23
Liability Derivatives, Notional Amount	3,119		3,119		24
Liability Derivatives, Estimated Fair Value	(8)		(8)		0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives	723	629	2,340	2,036
Stand-alone derivative instruments | Interest rate swaptions contracts | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	0		0		0
Asset Derivatives, Estimated Fair Value	0		0		0
Liability Derivatives, Notional Amount	0		0		0
Liability Derivatives, Estimated Fair Value	0		0		0
Stand-alone derivative instruments | Treasury futures contracts | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	25,000		25,000		28,000
Asset Derivatives, Estimated Fair Value	20		20		39
Liability Derivatives, Notional Amount	22,500		22,500		30,000
Liability Derivatives, Estimated Fair Value	(88)		(88)		(222)
Stand-alone derivative instruments | TBA mortgage securities | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	0		0		15,000
Asset Derivatives, Estimated Fair Value	0		0		16
Liability Derivatives, Notional Amount	50,000		50,000		100,000
Liability Derivatives, Estimated Fair Value	(250)		(250)		(63)
Stand-alone derivative instruments | Forward loan sale commitments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	35,800		35,800		259,000
Asset Derivatives, Estimated Fair Value	178		178		333
Liability Derivatives, Notional Amount	9,500		9,500		483,500
Liability Derivatives, Estimated Fair Value	(12)		(12)		(787)
Stand-alone derivative instruments | Interest rate lock commitments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	0		0		404,557
Asset Derivatives, Estimated Fair Value	0		0		1,571
Liability Derivatives, Notional Amount	33,351		33,351		0
Liability Derivatives, Estimated Fair Value	(232)		(232)		$ 0
Stand-alone derivative instruments | Mortgage related derivatives
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives	$ (1,630)	$ (11,625)	$ (3,083)	$ (22,067)

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Derivative Financial Instruments - Financial Instruments Eligible for Offset In Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financial Assets
Financial Assets, Gross Amount Recognized	$ 53,349	$ 17,540
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	53,349	17,540
Repurchase Agreements, Financial Assets, Gross Amount Recognized	0	0
Repurchase Agreements, Financial Assets, Gross Amount Offset	0	0
Repurchase Agreements, Financial Assets, Net Amount Recognized	0	0
Total Financial Assets, Gross Amount Recognized	53,349	17,540
Total Financial Assets, Gross Amount Offset	0	0
Total Financial Assets, Net Amount Recognized	53,349	17,540
Financial Assets, Financial Instruments	(18,540)	(14,719)
Financial Assets, Collateral	(15,426)	0
Financial Assets, Net Amount	19,383	2,821
Repurchase Agreements, Financial Assets, Financial Instruments	0	0
Repurchase Agreements, Financial Assets, Collateral	0	0
Repurchase Agreements, Financial Assets, Net Amount	0	0
Total Financial Assets, Financial Instruments	(18,540)	(14,719)
Total Financial Assets, Collateral	(15,426)	0
Total Financial Assets, Net Amount	19,383	2,821
Financial Liabilities
Financial Liabilities, Gross Amount Recognized	18,671	27,947
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	18,671	27,947
Repurchase Agreements, Financial Liabilities, Gross Amount Recognized	311,605	232,789
Repurchase Agreements, Financial Liabilities, Gross Amount Offset	0	0
Repurchase Agreements, Financial Liabilities, Net Amount Recognized	311,605	232,789
Total Financial Liabilities, Gross Amount Recognized	330,276	260,736
Total Financial Liabilities, Gross Amount Offset	0	0
Total Financial Liabilities, Net Amount Recognized	330,276	260,736
Financial Liabilities, Financial Instruments	(18,540)	(14,719)
Financial Liabilities, Collateral	(1,875)	(13,223)
Financial Liabilities, Net Amount	(1,744)	5
Repurchase Agreements, Financial Liabilities, Financial Instruments	0	0
Repurchase Agreements, Financial Liabilities, Collateral	(311,605)	(232,789)
Repurchase Agreements, Financial Liabilities, Net Amount	0	0
Total Financial Liabilities, Financial Instruments	(18,540)	(14,719)
Total Financial Liabilities, Collateral	(313,480)	(246,012)
Total Financial Liabilities, Net Amount	(1,744)	5
Counterparty A
Financial Assets
Financial Assets, Net Amount Recognized	10,830	6,068
Financial Assets, Financial Instruments	(2,550)	(6,068)
Financial Assets, Collateral	(8,253)	0
Financial Assets, Net Amount	27	0
Financial Liabilities
Financial Liabilities, Net Amount Recognized	2,550	13,807
Financial Liabilities, Financial Instruments	(2,550)	(6,068)
Financial Liabilities, Collateral	0	(7,739)
Financial Liabilities, Net Amount	0	0
Counterparty B
Financial Assets
Financial Assets, Net Amount Recognized	4,084	3,261
Financial Assets, Financial Instruments	(430)	(3,261)
Financial Assets, Collateral	(3,471)	0
Financial Assets, Net Amount	183	0
Financial Liabilities
Financial Liabilities, Net Amount Recognized	430	5,595
Financial Liabilities, Financial Instruments	(430)	(3,261)
Financial Liabilities, Collateral	0	(2,334)
Financial Liabilities, Net Amount	0	0
Counterparty C
Financial Assets
Financial Assets, Net Amount Recognized	2,280	5,285
Financial Assets, Financial Instruments	0	(3,640)
Financial Assets, Collateral	(1,950)	0
Financial Assets, Net Amount	330	1,645
Financial Liabilities
Financial Liabilities, Net Amount Recognized	0	3,640
Financial Liabilities, Financial Instruments	0	(3,640)
Financial Liabilities, Collateral	0	0
Financial Liabilities, Net Amount	0	0
Other counterparties
Financial Assets
Financial Assets, Net Amount Recognized	36,155	2,926
Financial Assets, Financial Instruments	(15,560)	(1,750)
Financial Assets, Collateral	(1,752)	0
Financial Assets, Net Amount	18,843	1,176
Financial Liabilities
Financial Liabilities, Net Amount Recognized	15,691	4,905
Financial Liabilities, Financial Instruments	(15,560)	(1,750)
Financial Liabilities, Collateral	(1,875)	(3,150)
Financial Liabilities, Net Amount	(1,744)	5
Interest rate swap contracts, caps and floors
Financial Assets
Financial Assets, Gross Amount Recognized	39,790	11,659
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	39,790	11,659
Financial Liabilities
Financial Liabilities, Gross Amount Recognized	3,046	11,562
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	3,046	11,562
Foreign exchange contracts
Financial Assets
Financial Assets, Gross Amount Recognized	700	1,013
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	700	1,013
Financial Liabilities
Financial Liabilities, Gross Amount Recognized	1,802	953
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	1,802	953
Mortgage related derivatives
Financial Assets
Financial Assets, Gross Amount Recognized	12,859	4,868
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	12,859	4,868
Financial Liabilities
Financial Liabilities, Gross Amount Recognized	13,823	15,432
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	$ 13,823	$ 15,432

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Operating Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable operating segments | segment			3
Net interest income	$ 161,848	$ 156,947	$ 474,298	$ 448,984
Provision for credit losses	21,503	4,517	35,230	17,950
Non-interest income	79,841	95,931	260,949	279,551
Non-interest expense	168,544	162,961	529,422	485,515
Income tax expense	8,928	24,557	32,591	65,224
Net income	42,714	60,843	138,004	159,846
Total assets	19,719,971	20,116,535	19,719,971	20,116,535	$ 20,086,940
Banking
Segment Reporting Information [Line Items]
Net interest income	152,003	142,888	439,088	410,319
Provision for credit losses	21,439	3,637	34,764	16,054
Non-interest income	46,750	45,128	136,558	130,564
Non-interest expense	126,979	113,014	367,489	337,289
Income tax expense	8,671	18,781	37,288	50,103
Net income	41,664	52,584	136,105	137,437
Total assets	16,677,552	16,406,714	16,677,552	16,406,714
Pretax merger related costs	4,200	1,600	9,600	9,000
Leasing
Segment Reporting Information [Line Items]
Net interest income	2,160	2,686	6,991	7,300
Provision for credit losses	90	399	566	674
Non-interest income	23,157	22,560	70,664	62,136
Non-interest expense	15,611	14,498	46,319	41,711
Income tax expense	2,480	4,307	4,288	10,951
Net income	7,136	6,042	26,482	16,100
Total assets	1,340,901	1,307,459	1,340,901	1,307,459
Mortgage Banking
Segment Reporting Information [Line Items]
Net interest income	7,685	11,373	28,219	31,365
Provision for credit losses	(26)	481	(100)	1,222
Non-interest income	9,934	28,243	53,727	86,851
Non-interest expense	25,954	35,449	115,614	106,515
Income tax expense	(2,223)	1,469	(8,985)	4,170
Net income	(6,086)	2,217	(24,583)	6,309
Total assets	1,701,518	$ 2,402,362	1,701,518	$ 2,402,362
Pretax merger related costs	$ 9,800		$ 29,900

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Preferred Stock (Details) $ / shares in Units, $ in Thousands				3 Months Ended	9 Months Ended	12 Months Ended
	Feb. 15, 2018 USD ($) $ / shares shares	Nov. 22, 2017 $ / shares shares	Aug. 18, 2014 $ / shares shares	Mar. 31, 2018	Sep. 30, 2018 USD ($) $ / shares shares	Dec. 31, 2017 $ / shares shares
Business Acquisition [Line Items]
Redemption of preferred stock | $					$ 100,000
Series A Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares) | shares					0	4,000,000
Preferred stock, liquidation preference per share (in dollars per share)					$ 25	$ 25
Preferred stock, dividend rate (percent)				8.00%	8.00%	8.00%
Stock redeemed or called during period (in shares) | shares	4,000,000
Preferred stock, redemption price per share (in dollars per share)	$ 25.00
Redemption of preferred stock | $	$ 100,000
Preferred stock redemption premium | $	$ 15,300
Series A Preferred Stock | Taylor Capital Merger
Business Acquisition [Line Items]
Stock conversion			1
Preferred stock, shares outstanding (in shares) | shares			4,000,000
Preferred stock, liquidation preference per share (in dollars per share)			$ 25
Preferred stock, dividend rate (percent)			8.00%
Series C Preferred Stock, Depository Shares
Business Acquisition [Line Items]
Preferred stock, liquidation preference per share (in dollars per share)		$ 25
Preferred stock, dividend rate (percent)		6.00%
Preferred stock, redemption price per share (in dollars per share)		$ 25
New issues of stock during period (in shares) | shares		8,000,000
Interest in preferred stock					0.025%
Series C Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares) | shares					200,000	200,000
Preferred stock, liquidation preference per share (in dollars per share)		$ 1,000			$ 1,000	$ 1,000
Preferred stock, dividend rate (percent)					6.00%	6.00%

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Definitive Merger Agreement (Details) - Merger With Fifth Third Bancorp	May 20, 2018 $ / shares shares
Business Combination, Separately Recognized Transactions [Line Items]
Number of shares called by each right (in shares) | shares	1.45
Cash paid per share (in dollars per share) | $ / shares	$ 5.54

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Subsequent Events (Details) - USD ($) $ in Thousands						9 Months Ended
	Oct. 23, 2018	Oct. 07, 2018	Sep. 17, 2018	Aug. 06, 2018	Aug. 24, 2016	Sep. 30, 2018	Sep. 30, 2017
Subsequent Event [Line Items]
Liquidation of trust preferred securities						$ 87,631	$ 0
American Chartered Statutory Trust II | Junior Subordinated Notes
Subsequent Event [Line Items]
Basis spread on variable rate						2.75%
FOBB Statutory Trust III | Junior Subordinated Notes
Subsequent Event [Line Items]
Basis spread on variable rate						2.80%
Trust Preferred Securities | Coal City Capital Trust I
Subsequent Event [Line Items]
Basis spread on variable rate						1.80%
Trust Preferred Securities | TAYC Capital Trust II
Subsequent Event [Line Items]
Basis spread on variable rate						2.68%
Trust Preferred Securities | American Chartered Statutory Trust II
Subsequent Event [Line Items]
Basis spread on variable rate						2.75%
Trust Preferred Securities | FOBB Statutory Trust III
Subsequent Event [Line Items]
Basis spread on variable rate						2.80%
Subsequent Event | Trust Preferred Securities | American Chartered Statutory Trust II
Subsequent Event [Line Items]
Liquidation of trust preferred securities		$ 10,000
Subsequent Event | Trust Preferred Securities | FOBB Statutory Trust III
Subsequent Event [Line Items]
Liquidation of trust preferred securities	$ 5,000
London Interbank Offered Rate (LIBOR)
Subsequent Event [Line Items]
Basis spread on variable rate					1.75%
London Interbank Offered Rate (LIBOR) | Coal City Capital Trust I | Junior Subordinated Notes
Subsequent Event [Line Items]
Basis spread on variable rate				1.80%
London Interbank Offered Rate (LIBOR) | TAYC Capital Trust II | Junior Subordinated Notes
Subsequent Event [Line Items]
Basis spread on variable rate			2.68%
London Interbank Offered Rate (LIBOR) | American Chartered Statutory Trust II | Junior Subordinated Notes
Subsequent Event [Line Items]
Basis spread on variable rate						2.75%
London Interbank Offered Rate (LIBOR) | Subsequent Event | FOBB Statutory Trust III | Junior Subordinated Notes
Subsequent Event [Line Items]
Basis spread on variable rate	2.80%