10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

þ	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended March 31, 2016

¨	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: 001-31343

Associated Banc-Corp

(Exact name of registrant as specified in its charter)

Wisconsin	39-1098068
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
433 Main Street Green Bay, Wisconsin	54301
(Address of principal executive offices)	(Zip Code)

(920) 491-7500

(Registrant’s telephone number, including area code)

(Former name, former address and former fiscal year, if changed since last report)

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  þ        No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted 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 and post such files).

Yes  þ        No  ¨

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

Large accelerated filer  þ	Accelerated filer  ¨
Non-accelerated filer  ¨	Smaller reporting company ¨
(Do not check if a smaller reporting company)

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

Yes  ¨        No  þ

APPLICABLE ONLY TO CORPORATE ISSUERS:

The number of shares outstanding of registrant’s common stock, par value $0.01 per share, at April 27, 2016, was 150,136,403.

.

1

ASSOCIATED BANC-CORP

TABLE OF CONTENTS

		Page
PART I. Financial Information
	Item 1. Financial Statements (Unaudited):	3
	Consolidated Balance Sheets	3
	Consolidated Statements of Income	4
	Consolidated Statements of Comprehensive Income	5
	Consolidated Statements of Changes in Stockholders’ Equity	6
	Consolidated Statements of Cash Flows	7
	Notes to Consolidated Financial Statements	8
	Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	42
	Item 3. Quantitative and Qualitative Disclosures About Market Risk	66
	Item 4. Controls and Procedures	66
PART II. Other Information
	Item 1. Legal Proceedings	68
	Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	68
	Item 6. Exhibits	69
	Signatures	70

2

PART I - FINANCIAL INFORMATION
ITEM 1.	Financial Statements:

ASSOCIATED BANC-CORP

Consolidated Balance Sheets

	March 31, 2016			December 31, 2015
	(Unaudited)			(Audited)
	(In Thousands, except share and per share data)
ASSETS
Cash and due from banks	$	287,183		$	374,921
Interest-bearing deposits in other financial institutions	68,025			79,764
Federal funds sold and securities purchased under agreements to resell	20,200			19,000
Investment securities held to maturity, at amortized cost	1,176,821			1,168,230
Investment securities available for sale, at fair value	4,905,841			4,967,414
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	181,853			147,240
Loans held for sale	128,339			124,915
Loans	19,227,240			18,714,343
Allowance for loan losses	(277,370		)	(274,264		)
Loans, net	18,949,870			18,440,079
Premises and equipment, net	331,711			267,606
Goodwill	971,951			968,844
Mortgage servicing rights, net	59,414			61,341
Other intangible assets	16,966			16,458
Trading assets	53,087			32,192
Other assets(1)	1,027,606			1,043,831
Total assets	$	28,178,867		$	27,711,835
LIABILITIES AND STOCKHOLDERS’ EQUITY
Noninterest-bearing demand deposits	$	5,272,685		$	5,562,466
Interest-bearing deposits	15,412,775			15,445,199
Total deposits	20,685,460			21,007,665
Federal funds purchased and securities sold under agreements to repurchase	583,247			431,438
Other short-term funding	834,161			402,978
Long-term funding(1)	2,861,316			2,676,164
Trading liabilities	55,223			33,430
Accrued expenses and other liabilities	176,962			222,914
Total liabilities	25,196,369			24,774,589
Stockholders’ equity
Preferred equity	120,347			121,379
Common equity:
Common stock	1,630			1,642
Surplus	1,447,368			1,458,522
Retained earnings	1,599,835			1,593,239
Accumulated other comprehensive income (loss)	2,167			(32,616		)
Treasury stock, at cost	(188,849		)	(204,920		)
Total common equity	2,862,151			2,815,867
Total stockholders’ equity	2,982,498			2,937,246
Total liabilities and stockholders’ equity	$	28,178,867		$	27,711,835
Preferred shares issued	124,054			125,114
Preferred shares authorized (par value $1.00 per share)	750,000			750,000
Common shares issued	163,030,209			164,200,068
Common shares authorized (par value $0.01 per share)	250,000,000			250,000,000
Treasury shares of common stock	12,036,645			12,960,636

(1) During the first quarter of 2016, the Corporation adopted a new accounting standard related to simplifying the presentation of debt issuance costs.  Under this new accounting standard, debt issuance costs are still capitalized; however, they are reflected on the balance sheet with the related debt issued rather than within other assets.  All prior periods have been restated to reflect this change in presentation. See Note 3 for additional information on this new accounting standard.

See accompanying notes to consolidated financial statements.

3

Item 1. Financial Statements Continued:

ASSOCIATED BANC-CORP

Consolidated Statements of Income (Unaudited)

	Three months ended March 31,
	2016		2015
	(In Thousands, except per share data)
INTEREST INCOME
Interest and fees on loans	$	159,656	$	151,945
Interest and dividends on investment securities:
Taxable	25,516		25,092
Tax-exempt	7,830		7,887
Other interest	1,067		1,692
Total interest income	194,069		186,616
INTEREST EXPENSE
Interest on deposits	11,766		7,619
Interest on Federal funds purchased and securities sold under agreements to repurchase	296		231
Interest on other short-term funding	515		81
Interest on long-term funding	9,505		10,872
Total interest expense	22,082		18,803
NET INTEREST INCOME	171,987		167,813
Provision for credit losses	20,000		4,500
Net interest income after provision for credit losses	151,987		163,313
NONINTEREST INCOME
Trust service fees	11,447		12,087
Service charges on deposit accounts	16,273		15,806
Card-based and other nondeposit fees	11,991		12,416
Insurance commissions	21,382		19,728
Brokerage and annuity commissions	3,794		3,683
Mortgage banking, net	4,204		7,408
Capital market fees, net	3,538		2,467
Bank owned life insurance income	4,770		2,875
Asset gains, net(1)	524		833
Investment securities gains, net	3,098		—
Other	2,171		2,510
Total noninterest income	83,192		79,813
NONINTEREST EXPENSE
Personnel expense	101,398		100,152
Occupancy	13,802		17,683
Equipment	5,446		5,772
Technology	14,264		15,558
Business development and advertising	8,211		5,327
Other intangible amortization	504		801
Loan expense	3,221		2,996
Legal and professional fees	5,025		4,538
Foreclosure / OREO expense, net(1)	1,877		1,162
FDIC expense	7,750		6,500
Other	12,473		13,503
Total noninterest expense	173,971		173,992
Income before income taxes	61,208		69,134
Income tax expense	18,674		22,462
Net income	42,534		46,672
Preferred stock dividends	2,198		1,228
Net income available to common equity	$	40,336	$	45,444
Earnings per common share:
Basic	$	0.27	$	0.30
Diluted	$	0.27	$	0.30
Average common shares outstanding:
Basic	148,601		150,070
Diluted	149,454		151,164

(1) During the first quarter of 2016, the consolidated statements of income were modified from prior periods' presentation to conform with the current period presentation, which reflect OREO gains/losses as a component of Foreclosure / OREO expense, net. In prior periods' presentation, OREO gains / losses were reported as a component of asset gains (losses), net. All prior periods have been restated to reflect this change in presentation.

See accompanying notes to consolidated financial statements.

4

Item 1. Financial Statements Continued:

ASSOCIATED BANC-CORP

Consolidated Statements of Comprehensive Income (Unaudited)

	Three Months Ended March 31,
	2016			2015
	($ in Thousands)
Net income	$	42,534		$	46,672
Other comprehensive income, net of tax:
Investment securities available for sale:
Net unrealized gains	60,422			47,418
Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities	(1,572		)	—
Reclassification adjustment for net gains realized in net income	(3,098		)	—
Income tax expense	(21,275		)	(18,105		)
Other comprehensive income on investment securities available for sale	34,477			29,313
Defined benefit pension and postretirement obligations:
Amortization of prior service cost	13			13
Amortization of actuarial losses	482			532
Income tax expense	(189		)	(208		)
Other comprehensive income on pension and postretirement obligations	306			337
Total other comprehensive income	34,783			29,650
Comprehensive income	$	77,317		$	76,322

See accompanying notes to consolidated financial statements.

5

Item 1. Financial Statements Continued:

ASSOCIATED BANC-CORP

Consolidated Statements of Changes in Stockholders’ Equity (Unaudited)

	Preferred Equity			Common Stock			Surplus			Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Treasury Stock			Total
	(In Thousands, except per share data)
Balance, December 31, 2014	$	59,727		$	1,665		$	1,484,933		$	1,497,818		$	(4,850	)	$	(239,042	)	$	2,800,251
Comprehensive income:
Net income	—			—			—			46,672			—			—			46,672
Other comprehensive income	—			—			—			—			29,650			—			29,650
Comprehensive income																			76,322
Common stock issued:
Stock-based compensation plans, net	—			—			304			(18,015		)	—			23,947			6,236
Acquisition of Ahmann & Martin Co.	—			26			43,504			—			—			—			43,530
Purchase of common stock returned to authorized but unissued	—			(17		)	(29,983		)	—			—			—			(30,000		)
Purchase of treasury stock	—			—			—			—			—			(4,105		)	(4,105		)
Cash dividends:
Common stock, $0.10 per share	—			—			—			(15,280		)	—			—			(15,280		)
Preferred stock	—			—			—			(1,228		)	—			—			(1,228		)
Stock-based compensation expense, net	—			—			5,774			—			—			—			5,774
Tax impact of stock-based compensation	—			—			638			—			—			—			638
Balance, March 31, 2015	$	59,727		$	1,674		$	1,505,170		$	1,509,967		$	24,800		$	(219,200	)	$	2,882,138
Balance, December 31, 2015	$	121,379		$	1,642		$	1,458,522		$	1,593,239		$	(32,616	)	$	(204,920	)	$	2,937,246
Comprehensive income:
Net income	—			—			—			42,534			—			—			42,534
Other comprehensive income	—			—			—			—			34,783			—			34,783
Comprehensive income																			77,317
Common stock issued:
Stock-based compensation plans, net	—			—			613			(17,271		)	—			18,863			2,205
Purchase of common stock returned to authorized but unissued	—			(12		)	(19,995		)	—			—			—			(20,007		)
Purchase of treasury stock	—			—			—			—			—			(2,792		)	(2,792		)
Cash dividends:
Common stock, $0.11 per share	—			—			—			(16,409		)	—			—			(16,409		)
Preferred stock	—			—			—			(2,198		)	—			—			(2,198		)
Purchase of preferred stock	(1,032		)	—			—			(60		)	—			—			(1,092		)
Stock-based compensation expense, net	—			—			8,066			—			—			—			8,066
Tax benefit of stock-based compensation	—			—			162			—			—			—			162
Balance, March 31, 2016	$	120,347		$	1,630		$	1,447,368		$	1,599,835		$	2,167		$	(188,849	)	$	2,982,498

See accompanying notes to consolidated financial statements.

6

Item 1. Financial Statements Continued:

ASSOCIATED BANC-CORP

Consolidated Statements of Cash Flows (Unaudited)

	Three Months Ended March 31,
	2016			2015
	($ in Thousands)
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	42,534		$	46,672
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	20,000			4,500
Depreciation and amortization	11,060			12,268
Addition to valuation allowance on mortgage servicing rights, net	909			243
Amortization of mortgage servicing rights	2,874			3,179
Amortization of other intangible assets	504			801
Amortization and accretion on earning assets, funding, and other, net	10,692			9,863
Tax impact of stock based compensation	162			638
Gain on sales of investment securities, net	(3,098		)	—
Gain on sales of assets and impairment write-downs, net	(524		)	(833		)
Gain on mortgage banking activities, net	(3,106		)	(3,141		)
Mortgage loans originated and acquired for sale	(193,849		)	(268,296		)
Proceeds from sales of mortgage loans held for sale	221,764			238,399
Decrease in interest receivable	(5,180		)	(2,186		)
Decrease in interest payable	(6,121		)	(948		)
Commercial loans held for sale	(30,089		)	—
Net change in other assets and other liabilities	(46,160		)	(29,848		)
Net cash provided by operating activities	22,372			11,311
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in loans	(531,891		)	(368,794		)
Purchases of:
Available for sale securities	(182,895		)	(202,615		)
Held to maturity securities	(28,570		)	(36,788		)
Federal Home Loan Bank and Federal Reserve Bank stocks	(34,613		)	(115		)
Premises, equipment, and software, net of disposals	(70,685		)	(13,944		)
Other assets	(1,226		)	(1,207		)
Proceeds from:
Sales of available for sale securities	119,379			289
Prepayments, calls, and maturities of available for sale investment securities	180,458			282,835
Prepayments, calls, and maturities of held to maturity investment securities	15,029			5,155
Sales, prepayments, calls, and maturities of other assets	9,566			—
Net cash (paid) received in acquisition	(685		)	1,202
Net cash used in investing activities	(526,133		)	(333,982		)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	(322,205		)	1,088,088
Net increase (decrease) in short-term funding	582,992			(405,751		)
Repayment of long-term funding	(430,010		)	(500,009		)
Proceeds from issuance of long-term funding	615,000			—
Proceeds from issuance of common stock for stock-based compensation plans	2,205			6,236
Purchase of preferred stock	(1,092		)	—
Purchase of common stock returned to authorized but unissued	(20,007		)	(30,000		)
Purchase of treasury stock	(2,792		)	(4,105		)
Cash dividends on common stock	(16,409		)	(15,280		)
Cash dividends on preferred stock	(2,198		)	(1,228		)
Net cash provided by financing activities	405,484			137,951
Net increase (decrease) in cash and cash equivalents	(98,277		)	(184,720		)
Cash and cash equivalents at beginning of period	473,685			1,032,067
Cash and cash equivalents at end of period	$	375,408		$	847,347
Supplemental disclosures of cash flow information:
Cash paid for interest	$	28,041		$	19,643
Cash paid for income taxes	1,167			—
Loans and bank premises transferred to other real estate owned	3,160			2,104
Capitalized mortgage servicing rights	1,856			3,010
Acquisition:
Fair value of assets acquired, including cash and cash equivalents	522			5,160
Fair value ascribed to goodwill and intangible assets	4,119			51,221
Fair value of liabilities assumed	1,423			12,851
Common stock issued in acquisition	—			43,530

See accompanying notes to consolidated financial statements.

7

Item 1. Financial Statements Continued:

ASSOCIATED BANC-CORP

Notes to Consolidated Financial Statements

These interim consolidated financial statements have been prepared according to the rules and regulations of the Securities and Exchange Commission and, therefore, certain information and footnote disclosures normally presented in accordance with U.S. generally accepted accounting principles have been omitted or abbreviated. The information contained in the consolidated financial statements and footnotes in the Corporation's 2015 Annual Report on Form 10-K, should be referred to in connection with the reading of these unaudited interim financial statements.

Note 1Basis of Presentation

In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly the financial position, results of operations and comprehensive income, changes in stockholders’ equity, and cash flows of Associated Banc-Corp (individually referred to herein as the “Parent Company,” and together with all of its subsidiaries and affiliates, collectively referred to herein as the “Corporation”) for the periods presented, and all such adjustments are of a normal recurring nature. The consolidated financial statements include the accounts of all subsidiaries. All significant intercompany transactions and balances have been eliminated in consolidation. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the full year.

In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ significantly from those estimates. Estimates that are particularly susceptible to significant change include the determination of the allowance for loan losses, goodwill impairment assessment, mortgage servicing rights valuation, and income taxes. Management has evaluated subsequent events for potential recognition or disclosure.

During the first quarter of 2016, the consolidated statements of income were modified from prior periods' presentation to conform with the current period presentation, which reflects OREO gains / losses as a component of Foreclosure / OREO expense, net. In prior periods' presentation, OREO gains/losses were reported as a component of asset gains (losses), net. All prior periods have been restated to reflect this change.

During the first quarter of 2016, the Corporation combined the lease financing portfolio with the commercial and industrial portfolio for disclosure purposes. All prior periods have been restated to reflect this change in presentation.

Note 2Acquisitions

On February 17, 2015, the Corporation acquired Ahmann & Martin Co., a risk and employee benefits consulting firm based in Minnesota. The firm merged into Associated Financial Group, LLC, the Corporation's insurance brokerage subsidiary. The Corporation's acquisition of Ahmann & Martin Co. enhances the Corporation's ability to offer clients unique, comprehensive solutions to meet their insurance and financial risk management needs. The transaction was valued at approximately $48 million with the opportunity to increase the consideration by $8 million should certain contingencies be met over a defined period.

The transaction was accounted for using the acquisition method of accounting and as such, assets acquired, liabilities assumed and consideration exchanged were recorded at their estimated fair value on the acquisition date. Goodwill from the acquisition represents the excess of the purchase price over the fair value of the net tangible and intangible assets acquired and is not deductible for tax purposes. As a result of the acquisition, the Corporation recorded goodwill of approximately $40 million and other intangible assets of approximately $12 million. Goodwill was assigned to the Corporation's Community, Consumer, and Business segment. See Note 8 for additional information on goodwill and other intangible assets.

During the first quarter of 2016, the Corporation completed two small insurance acquisitions to complement its existing insurance and benefits related products and services provided by Associated Financial Group, LLC. The Corporation recorded goodwill of $3 million and other intangibles of $1 million related to these insurance acquisitions.

Note 3New Accounting Pronouncements Adopted

In September 2015, the FASB issued an amendment to simplify the accounting for measurement adjustments to prior business combinations. The amendment requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The acquirer must record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date.

8

The amendment also requires an entity to present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. This amendment was effective for fiscal years beginning after December 15, 2015, including interim periods within those fiscal years. The Corporation adopted the accounting standard during the first quarter of 2016, as required, and with no material impact on its results of operations, financial position, or liquidity.

In May 2015, the FASB issued an amendment to eliminate the requirement to categorize investments measured using the net asset value per share ("NAV") practical expedient in the fair value hierarchy table. Entities will be required to disclose the fair value of investments measured using the NAV practical expedient so that financial statement users can reconcile amounts reported in the fair value hierarchy table to amounts reported on the balance sheet. The Corporation adopted the accounting standard during the first quarter of 2016, as required, with no material impact on its results of operations, financial position, or liquidity.

In April 2015, the FASB issued an amendment to provide guidance to customers about whether a cloud computing arrangement included a software license. If the cloud computing arrangement includes a software license, then the customer should account for the software license element consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. This amendment was effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2015. The Corporation adopted the accounting standard on a prospective basis during the first quarter of 2016, as required, and with no material impact on its results of operations, financial position, or liquidity.

In April 2015, the FASB issued an amendment to simplify the presentation of debt issuance costs. This amendment requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. In August 2015, the FASB expanded this amendment to include SEC staff views related to debt issuance costs associated with line-of-credit arrangements. The SEC staff would not object to an entity deferring and presenting debt issuance costs as an asset and subsequently amortizing the deferred debt issuance costs over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. This amendment required retrospective application and was effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The Corporation adopted the accounting standard during the first quarter of 2016. All prior periods have been restated to reflect this change in presentation, resulting in a $3 million reduction to other assets and a corresponding $3 million reduction to long-term funding on the balance sheet compared to the amounts originally reported at December 31, 2015. See "Consolidated Balance Sheets" and Note 9 for additional information on the reclassification of debt issuance costs.

In February 2015, the FASB issued an amendment to modify existing consolidation guidance for reporting companies that are required to evaluate whether they should consolidate legal entities. The new standard will place more emphasis on risk of loss when determining a controlling financial interest. Frequency in the application of related-party guidance for determining a controlling financial interest will be reduced. Also, consolidation conclusions for public and private companies among several industries that make use of limited partnerships or VIEs will be changed. This amendment was effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The Corporation adopted the accounting standard during the first quarter of 2016, as required, and with no material impact on its results of operations, financial position, or liquidity.

In January 2015, the FASB issued an amendment to eliminate from U.S. GAAP the concept of extraordinary items. Presently, an event or transaction is presumed to be an ordinary and usual activity of the reporting entity unless evidence clearly supports its classification as an extraordinary item. If an event or transaction meets the criteria for extraordinary classification, an entity is required to segregate the extraordinary item from the results of ordinary operations and show the item separately in the income statement, net of tax, after income from continuing operations. This amended guidance will prohibit separate disclosure of extraordinary items in the income statement. This amendment was effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The Corporation adopted the accounting standard during the first quarter of 2016, as required, with no material impact.

In June 2014, the FASB issued an amendment to the stock compensation accounting guidance to clarify that a performance target that affects vesting of a share-based payment and that could be achieved after the requisite service period be treated as a performance condition. As such, the performance target should not be reflected in estimating the grant-date fair value of the award. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the period(s) for which the requisite service has already been rendered. This amendment was effective for annual reporting periods, including interim periods within those annual periods, beginning after December 15, 2015. The Corporation adopted the accounting standard on a prospective basis during the first quarter of 2016, as required, with no material impact on its results of operations, financial position, or liquidity.

9

Note 4Earnings Per Common Share

Earnings per common share are calculated utilizing the two-class method. Basic earnings per common share are calculated by dividing the sum of distributed earnings to common shareholders and undistributed earnings allocated to common shareholders by the weighted average number of common shares outstanding. Diluted earnings per common share are calculated by dividing the sum of distributed earnings to common shareholders and undistributed earnings allocated to common shareholders by the weighted average number of common shares outstanding adjusted for the dilutive effect of common stock awards (outstanding stock options, unvested restricted stock awards, and outstanding common stock warrants). Presented below are the calculations for basic and diluted earnings per common share.

	For the Three Months Ended March 31,
	2016			2015
	(In thousands, except per share data)
Net income	$	42,534		$	46,672
Preferred stock dividends	(2,198		)	(1,228		)
Net income available to common equity	$	40,336		$	45,444
Common shareholder dividends	(16,203		)	(15,166		)
Unvested share-based payment awards	(206		)	(114		)
Undistributed earnings	$	23,927		$	30,164
Undistributed earnings allocated to common shareholders	23,686			29,886
Undistributed earnings allocated to unvested share-based payment awards	241			278
Undistributed earnings	$	23,927		$	30,164
Basic
Distributed earnings to common shareholders	$	16,203		$	15,166
Undistributed earnings allocated to common shareholders	23,686			29,886
Total common shareholders earnings, basic	$	39,889		$	45,052
Diluted
Distributed earnings to common shareholders	$	16,203		$	15,166
Undistributed earnings allocated to common shareholders	23,686			29,886
Total common shareholders earnings, diluted	$	39,889		$	45,052
Weighted average common shares outstanding	148,601			150,070
Effect of dilutive common stock awards	853			1,094
Diluted weighted average common shares outstanding	149,454			151,164
Basic earnings per common share	$	0.27		$	0.30
Diluted earnings per common share	$	0.27		$	0.30

Options to purchase approximately 3 million and 2 million shares were outstanding for the three months ended March 31, 2016 and 2015, respectively, but excluded from the calculation of diluted earnings per common share as the effect would have been anti-dilutive. Warrants to purchase approximately 4 million shares were outstanding for both three months ended March 31, 2016 and 2015, but excluded from the calculation of diluted earnings per common shares as the effect would have been anti-dilutive.

Note 5Stock-Based Compensation

Stock-Based Compensation Plan:

In March 2013, the Board of Directors, with subsequent approval of the Corporation’s shareholders, approved the adoption of the 2013 Incentive Compensation Plan (“2013 Plan”). Under the 2013 Plan, options are generally exercisable up to 10 years from the date of grant, have an exercise price that is equal to the closing price of the Corporation’s stock on the grant date, and vest ratably over four years, while service-based restricted stock awards vest ratably over four years and performance-based restricted stock awards vest over the three year performance period.

The Corporation issues restricted common stock and restricted common stock units to certain key employees (collectively referred to as “restricted stock awards”) under this plan. The shares of restricted stock are restricted as to transfer, but are not restricted as to dividend payment or voting rights. Restricted stock units receive dividend equivalents but do not have voting rights. The transfer restrictions lapse over three or four years, depending upon whether the awards are service-based or performance-based. Service-based awards are contingent upon continued employment or meeting the requirements for retirement, and performance-based

10

awards are based on earnings per share performance goals, relative total shareholder return, and continued employment or meeting the requirements for retirement. The plan provides that restricted stock awards and stock options will immediately become fully vested upon retirement from the Corporation of those colleagues whose retirement meets the early retirement or normal retirement definitions under the plan (“retirement eligible colleagues”).

Accounting for Stock-Based Compensation:

The fair value of stock options granted is estimated on the date of grant using a Black-Scholes option pricing model, while the fair value of restricted stock awards is their fair market value on the date of grant. The fair values of stock options and restricted stock awards are amortized as compensation expense on a straight-line basis over the vesting period of the grants. For retirement eligible colleagues, expenses related to stock options and restricted stock awards are fully recognized on the date the colleague meets the definition of normal or early retirement. Compensation expense recognized is included in personnel expense in the consolidated statements of income.

Assumptions are used in estimating the fair value of stock options granted. The weighted average expected life of the stock option represents the period of time that stock options are expected to be outstanding and is estimated using historical data of stock option exercises and forfeitures. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. The expected volatility is based on the implied volatility of the Corporation’s stock. The following assumptions were used in estimating the fair value for options granted in the first three months of 2016 and full year 2015.

	2016		2015
Dividend yield	2.50	%	2.00	%
Risk-free interest rate	2.00	%	2.00	%
Weighted average expected volatility	25.00	%	20.00	%
Weighted average expected life	5.5 years		6.0 years
Weighted average per share fair value of options	$3.36		$3.08

The Corporation is required to estimate potential forfeitures of stock grants and adjust compensation expense recorded accordingly. The estimate of forfeitures will be adjusted over the requisite service period to the extent that actual forfeitures differ, or are expected to differ, from such estimates. Changes in estimated forfeitures will be recognized in the period of change and will also impact the amount of stock-based compensation expense to be recognized in future periods.

A summary of the Corporation’s stock option activity for the year ended December 31, 2015, and the three month ended March 31, 2016 is presented below.

Stock Options	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value (000s)
Outstanding at December 31, 2014	7,847,338		$	18.34
Granted	1,348,504		17.95
Exercised	(1,351,646	)	13.90
Forfeited or expired	(1,215,053	)	29.13
Outstanding at December 31, 2015	6,629,143		$	17.22	6.24	$	18,730
Options Exercisable at December 31, 2015	4,190,245		$	17.25	4.93	$	14,873
Granted	1,302,298		$	17.45
Exercised	(96,602	)	13.60
Forfeited or expired	(48,190	)	17.75
Outstanding at March 31, 2016	7,786,649		$	17.30	6.61	$	14,682
Options Exercisable at March 31, 2016	4,907,257		$	17.22	5.18	$	12,950

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The following table summarizes information about the Corporation’s nonvested stock option activity for the year ended December 31, 2015, and for the three months ended March 31, 2016.

Nonvested Stock Options	Shares		Weighted Average Grant Date Fair Value
Nonvested at December 31, 2014	2,770,662		$	3.74
Granted	1,348,504		3.08
Vested	(1,459,709	)	4.19
Forfeited	(220,559	)	3.28
Nonvested at December 31, 2015	2,438,898		$	3.15
Granted	1,302,298		3.36
Vested	(813,614	)	3.25
Forfeited	(48,190	)	3.20
Nonvested at March 31, 2016	2,879,392		$	3.21

Intrinsic value represents the amount by which the fair market value of the underlying stock exceeds the exercise price of the stock option. For the three months ended March 31, 2016, the intrinsic value of stock options exercised was approximately $420,000. For the year ended December 31, 2015 the intrinsic value of the stock options exercised was $7 million. The total fair value of stock options that vested were $3 million and $6 million, respectively, for the three months ended March 31, 2016 and for the year ended December 31, 2015. The Corporation recognized compensation expense for the vesting of stock options of over $1 million and $4 million for the three month ended March 31, 2016 and year ended December 31, 2015, respectively. Included in compensation expense for 2016 was approximately $857,000 of expense for the accelerated vesting of stock options granted to retirement eligible colleagues. At March 31, 2016, the Corporation had $8 million of unrecognized compensation expense related to stock options that is expected to be recognized over the remaining requisite service periods that extend predominantly through the fourth quarter 2019.

The following table summarizes information about the Corporation’s restricted stock activity for the year ended December 31, 2015, and for the three months ended March 31, 2016.

Restricted Stock	Shares		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2014	1,982,126		$	15.79
Granted	1,173,847		18.09
Vested	(709,582	)	15.62
Forfeited	(196,363	)	16.87
Outstanding at December 31, 2015	2,250,028		$	17.03
Granted	1,041,985		16.37
Vested	(732,553	)	16.46
Forfeited	(34,299	)	17.69
Outstanding at March 31, 2016	2,525,161		$	16.91

The Corporation amortizes the expense related to restricted stock awards as compensation expense over the vesting period specified in the grant. Performance-based restricted stock awards granted during 2015 and 2016 will vest ratably over a three year period, while service-based restricted stock awards granted during 2015 and 2016 will vest ratably over a four year period. Expense for restricted stock awards of approximately $7 million and $15 million was recorded for the three months ended March 31, 2016 and year ended December 31, 2015, respectively. Included in compensation expense for 2016 was approximately $2 million of expense for the accelerated vesting of restricted stock awards granted to retirement eligible colleagues. The Corporation had $33 million of unrecognized compensation costs related to restricted stock awards at March 31, 2016, that is expected to be recognized over the remaining requisite service periods that extend predominantly through fourth quarter 2019.

The Corporation has the ability to issue shares from treasury or new shares upon the exercise of stock options or the granting of restricted stock awards. The Board of Directors has authorized management to repurchase shares of the Corporation’s common stock each quarter in the market, to be made available for issuance in connection with the Corporation’s employee incentive plans and for other corporate purposes. The repurchase of shares will be based on market and investment opportunities, capital levels, growth prospects, and regulatory constraints. Such repurchases may occur from time to time in open market purchases, block transactions, private transactions, accelerated share repurchase programs, or similar facilities.

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Note 6Investment Securities

Investment securities are generally classified as available for sale or held to maturity at the time of purchase. The majority of the Corporation's investment securities are mortgage-related securities issued by the Government National Mortgage Association (“GNMA”) or government-sponsored enterprises ("GSE") such as the Federal National Mortgage Association (“FNMA”) and the Federal Home Loan Mortgage Corporation (“FHLMC”). The amortized cost and fair values of securities available for sale and held to maturity were as follows.

March 31, 2016	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
U. S. Treasury securities	$	1,000	$	—	$	—		$	1,000
Residential mortgage-related securities:
FNMA / FHLMC	1,268,929		35,321		(846		)	1,303,404
GNMA	1,536,248		11,086		(79		)	1,547,255
Private-label	1,535		—		(23		)	1,512
GNMA commercial mortgage-related securities	2,053,540		5,855		(11,530		)	2,047,865
Other securities (debt and equity)	4,718		87		—			4,805
Total investment securities available for sale	$	4,865,970	$	52,349	$	(12,478	)	$	4,905,841
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	$	1,054,757	$	25,972	$	(146	)	$	1,080,583
Residential mortgage-related securities:
FNMA / FHLMC	40,404		797		(180		)	41,021
GNMA	81,660		1,086		(5		)	82,741
Total investment securities held to maturity	$	1,176,821	$	27,855	$	(331	)	$	1,204,345

December 31, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
U. S. Treasury securities	$	999	$	—	$	(2	)	$	997
Residential mortgage-related securities:
FNMA / FHLMC	1,388,995		33,791		(8,160		)	1,414,626
GNMA	1,605,956		507		(16,460		)	1,590,003
Private-label	1,722		1		(14		)	1,709
GNMA commercial mortgage-related securities	1,982,477		1,334		(28,501		)	1,955,310
Other securities (debt and equity)	4,718		51		—			4,769
Total investment securities available for sale	$	4,984,867	$	35,684	$	(53,137	)	$	4,967,414
Investment securities held to maturity:
Municipal securities	$	1,043,767	$	16,803	$	(339	)	$	1,060,231
Residential mortgage-related securities:
FNMA / FHLMC	41,469		513		(645		)	41,337
GNMA	82,994		189		(309		)	82,874
Total investment securities held to maturity	$	1,168,230	$	17,505	$	(1,293	)	$	1,184,442

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The amortized cost and fair values of investment securities available for sale and held to maturity at March 31, 2016, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Available for Sale					Held to Maturity
($ in Thousands)	Amortized Cost		Fair Value			Amortized Cost		Fair Value
Due in one year or less	$	2,500	$	2,530		$	46,749	$	32,151
Due after one year through five years	3,200		3,200			243,423		255,338
Due after five years through ten years	—		—			245,683		255,755
Due after ten years	—		—			518,902		537,339
Total debt securities	5,700		5,730			1,054,757		1,080,583
Residential mortgage-related securities:
FNMA / FHLMC	1,268,929		1,303,404			40,404		41,021
GNMA	1,536,248		1,547,255			81,660		82,741
Private-label	1,535		1,512			—		—
GNMA commercial mortgage-related securities	2,053,540		2,047,865			—		—
Equity securities	18		75			—		—
Total investment securities	$	4,865,970	$	4,905,841		$	1,176,821	$	1,204,345
Ratio of Fair Value to Amortized Cost			100.8		%			102.3		%

During the first three months of 2016, the Corporation continued to restructure its investment securities portfolio and sold approximately $119 million of FNMA and FHLMC mortgage-related securities and reinvested into GNMA mortgage-related securities, generating a $3 million net gain on sale. This restructuring lowered risk weighted assets and related capital requirements.

	Three Months Ended March 31,
	2016			2015
	($ in Thousands)
Gross gains	$	3,287		$	—
Gross losses	(189		)	—
Investment securities gains, net	$	3,098		$	—
Proceeds from sales of investment securities	$	119,379		$	289

Pledged securities with a carrying value of approximately $2.7 billion and $3.2 billion at March 31, 2016, and December 31, 2015, respectively, were pledged to secure certain deposits or for other purposes as required or permitted by law.

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The following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at March 31, 2016.

	Less than 12 months						12 months or more						Total
March 31, 2016	Number of Securities	Unrealized Losses			Fair Value		Number of Securities	Unrealized Losses			Fair Value		Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
Residential mortgage-related securities:
FNMA / FHLMC	—	$	—		$	—	12	$	(846	)	$	258,670	$	(846	)	$	258,670
GNMA	2	(79		)	41,913		—	—			—		(79		)	41,913
Private-label	1	(1		)	76		3	(22		)	1,382		(23		)	1,458
GNMA commercial mortgage-related securities	20	(1,390		)	558,620		21	(10,140		)	448,861		(11,530		)	1,007,481
Total	23	$	(1,470	)	$	600,609	36	$	(11,008	)	$	708,913	$	(12,478	)	$	1,309,522
Investment securities held to maturity:
Municipal securities	20	$	(75	)	$	10,029	17	$	(71	)	$	5,599	$	(146	)	$	15,628
Residential mortgage-related securities:
FNMA / FHLMC	1	(3		)	1,180		5	(177		)	13,587		(180		)	14,767
GNMA	—	—			—		1	(5		)	1,548		(5		)	1,548
Total	21	$	(78	)	$	11,209	23	$	(253	)	$	20,734	$	(331	)	$	31,943

For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2015.

	Less than 12 months						12 months or more						Total
December 31, 2015	Number of Securities	Unrealized Losses			Fair Value		Number of Securities	Unrealized Losses			Fair Value		Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
U.S. Treasury securities	1	$	(2	)	$	997	—	$	—		$	—	$	(2	)	$	997
Residential mortgage-related securities:
FNMA / FHLMC	17	(1,548		)	220,852		14	(6,612		)	338,186		(8,160		)	559,038
GNMA	46	(16,460		)	1,434,484		—	—			—		(16,460		)	1,434,484
Private-label	1	(1		)	83		3	(13		)	1,565		(14		)	1,648
GNMA commercial mortgage-related securities	40	(9,610		)	1,132,844		21	(18,891		)	448,218		(28,501		)	1,581,062
Total	105	$	(27,621	)	$	2,789,260	38	$	(25,516	)	$	787,969	$	(53,137	)	$	3,577,229
Investment securities held to maturity:
Municipal securities	53	$	(146	)	$	23,137	24	$	(193	)	$	9,254	$	(339	)	$	32,391
Residential mortgage-related securities:
FNMA / FHLMC	10	(177		)	12,754		3	(468		)	11,106		(645		)	23,860
GNMA	21	(201		)	45,499		3	(108		)	6,797		(309		)	52,296
Total	84	$	(524	)	$	81,390	30	$	(769	)	$	27,157	$	(1,293	)	$	108,547

The Corporation reviews the investment securities portfolio on a quarterly basis to monitor its exposure to other-than-temporary impairment. A determination as to whether a security’s decline in fair value is other-than-temporary takes into consideration numerous factors and the relative significance of any single factor can vary by security. Some factors the Corporation may consider in the other-than-temporary impairment analysis include, the length of time and extent to which the security has been in an unrealized loss position, changes in security ratings, financial condition and near-term prospects of the issuer, as well as security and industry specific economic conditions.

Based on the Corporation’s evaluation, management does not believe any unrealized loss at March 31, 2016, represents an other-than-temporary impairment as these unrealized losses are primarily attributable to changes in interest rates and the current market conditions, and not credit deterioration. The unrealized losses reported for municipal securities relate to various state and local

15

political subdivisions and school districts. The Corporation currently does not intend to sell nor does it believe that it will be required to sell the securities contained in the above unrealized losses table before recovery of their amortized cost basis. The reduction in unrealized losses at March 31, 2016 is due to the reduction in overall interest rates.  The U.S. Treasury 3-year and 5-year rates dropped by 44 basis points ("bp") and 55 bp, respectively, from December 31, 2015.

Federal Home Loan Bank (“FHLB”) and Federal Reserve Bank Stocks: The Corporation is required to maintain Federal Reserve stock and FHLB stock as a member of both the Federal Reserve System and the FHLB, and in amounts as required by these institutions. These equity securities are “restricted” in that they can only be sold back to the respective institutions or another member institution at par. Therefore, they are less liquid than other marketable equity securities and their fair value is equal to amortized cost. At March 31, 2016, and December 31, 2015, the Corporation had FHLB stock of $108 million and $74 million, respectively, reflecting the overall increase in FHLB short-term and long-term funding. The Corporation had Federal Reserve Bank stock of $73 million at both March 31, 2016 and December 31, 2015, respectively.

Note 7Loans

The period end loan composition was as follows.

	March 31, 2016		December 31, 2015
	($ in Thousands)
Commercial and industrial	$	6,511,648	$	6,190,683
Commercial real estate — owner occupied	917,285		918,212
Commercial and business lending	7,428,933		7,108,895
Commercial real estate — investor	3,276,733		3,234,266
Real estate construction	1,184,398		1,162,145
Commercial real estate lending	4,461,131		4,396,411
Total commercial	11,890,064		11,505,306
Residential mortgage	5,944,457		5,783,267
Home equity	982,994		1,005,802
Other consumer	409,725		419,968
Total consumer	7,337,176		7,209,037
Total loans	$	19,227,240	$	18,714,343

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The following table presents commercial and consumer loans by credit quality indicator at March 31, 2016.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	5,713,979	$	272,090	$	328,464	$	197,115	$	6,511,648
Commercial real estate - owner occupied	834,879		31,856		41,107		9,443		917,285
Commercial and business lending	6,548,858		303,946		369,571		206,558		7,428,933
Commercial real estate - investor	3,208,338		30,680		25,385		12,330		3,276,733
Real estate construction	1,180,914		222		2,422		840		1,184,398
Commercial real estate lending	4,389,252		30,902		27,807		13,170		4,461,131
Total commercial	10,938,110		334,848		397,378		219,728		11,890,064
Residential mortgage	5,883,743		5,014		3,488		52,212		5,944,457
Home equity	967,267		1,446		209		14,072		982,994
Other consumer	408,819		523		—		383		409,725
Total consumer	7,259,829		6,983		3,697		66,667		7,337,176
Total	$	18,197,939	$	341,831	$	401,075	$	286,395	$	19,227,240

The following table presents commercial and consumer loans by credit quality indicator at December 31, 2015.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	5,522,809	$	341,169	$	233,130	$	93,575	$	6,190,683
Commercial real estate - owner occupied	835,572		38,885		35,706		8,049		918,212
Commercial and business lending	6,358,381		380,054		268,836		101,624		7,108,895
Commercial real estate - investor	3,153,703		45,976		25,944		8,643		3,234,266
Real estate construction	1,157,034		252		3,919		940		1,162,145
Commercial real estate lending	4,310,737		46,228		29,863		9,583		4,396,411
Total commercial	10,669,118		426,282		298,699		111,207		11,505,306
Residential mortgage	5,727,437		1,552		2,796		51,482		5,783,267
Home equity	988,574		1,762		222		15,244		1,005,802
Other consumer	419,087		556		—		325		419,968
Total consumer	7,135,098		3,870		3,018		67,051		7,209,037
Total	$	17,804,216	$	430,152	$	301,717	$	178,258	$	18,714,343

Factors that are important to managing overall credit quality are sound loan underwriting and administration, systematic monitoring of existing loans and commitments, effective loan review on an ongoing basis, early identification of potential problems, and appropriate allowance for loan losses, allowance for unfunded commitments, nonaccrual, and charge off policies.

For commercial loans, management has determined the pass credit quality indicator to include credits that exhibit acceptable financial statements, cash flow, and leverage. If any risk exists, it is mitigated by the loan structure, collateral, monitoring, or control. For consumer loans, performing loans include credits that are performing in accordance with the original contractual terms. Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Special mention credits have potential weaknesses that deserve management’s attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the credit. Potential problem loans are considered inadequately protected by the current net worth and paying capacity of the obligor or the collateral pledged. These loans generally have a well-defined weakness, or weaknesses, that may jeopardize liquidation of the debt and are characterized by the distinct possibility that the Corporation will sustain some loss if the deficiencies are not corrected. Lastly, management considers a loan to be impaired when it is probable that the Corporation will be unable to collect all amounts due according to the original contractual terms of the note agreement, including both principal and interest. Management has determined that commercial and consumer loan relationships that have nonaccrual status or have had their terms restructured in a troubled debt restructuring meet this impaired loan definition. Commercial loans classified as special mention, potential problem, and nonaccrual loans are reviewed at a minimum on a quarterly basis, while pass and performing rated credits are reviewed on an annual basis or more frequently if the loan renewal is less than one year or if otherwise warranted.

17

The following table presents loans by past due status at March 31, 2016.

	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due (a)		Nonaccrual (b)		Total
	($ in Thousands)
Commercial and industrial	$	6,311,415	$	2,665	$	236	$	217	$	197,115	$	6,511,648
Commercial real estate - owner occupied	907,322		520		—		—		9,443		917,285
Commercial and business lending	7,218,737		3,185		236		217		206,558		7,428,933
Commercial real estate - investor	3,263,331		748		324		—		12,330		3,276,733
Real estate construction	1,183,143		415		—		—		840		1,184,398
Commercial real estate lending	4,446,474		1,163		324		—		13,170		4,461,131
Total commercial	11,665,211		4,348		560		217		219,728		11,890,064
Residential mortgage	5,888,651		3,199		395		—		52,212		5,944,457
Home equity	963,118		4,410		1,394		—		14,072		982,994
Other consumer	406,248		1,020		662		1,412		383		409,725
Total consumer	7,258,017		8,629		2,451		1,412		66,667		7,337,176
Total	$	18,923,228	$	12,977	$	3,011	$	1,629	$	286,395	$	19,227,240

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at March 31, 2016 (the same as the reported balances for the accruing loans noted above).

(b) Of the total nonaccrual loans,$230 million or 80% were current with respect to payment at March 31, 2016.

The following table presents loans by past due status at December 31, 2015.

	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due (a)		Nonaccrual (b)		Total
	($ in Thousands)
Commercial and industrial	$	6,095,848	$	602	$	409	$	249	$	93,575	$	6,190,683
Commercial real estate - owner occupied	903,021		7,142		—		—		8,049		918,212
Commercial and business lending	6,998,869		7,744		409		249		101,624		7,108,895
Commercial real estate - investor	3,225,332		291		—		—		8,643		3,234,266
Real estate construction	1,160,909		270		26		—		940		1,162,145
Commercial real estate lending	4,386,241		561		26		—		9,583		4,396,411
Total commercial	11,385,110		8,305		435		249		111,207		11,505,306
Residential mortgage	5,726,855		4,491		439		—		51,482		5,783,267
Home equity	982,639		6,190		1,729		—		15,244		1,005,802
Other consumer	416,374		1,195		675		1,399		325		419,968
Total consumer	7,125,868		11,876		2,843		1,399		67,051		7,209,037
Total	$	18,510,978	$	20,181	$	3,278	$	1,648	$	178,258	$	18,714,343

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2015 (the same as the reported balances for the accruing loans noted above).

(b) Of the total nonaccrual loans,$124 million or 69% were current with respect to payment at December 31, 2015.

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The following table presents impaired loans at March 31, 2016.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	105,780	$	106,837	$	14,595	$	106,280	$	613
Commercial real estate — owner occupied	10,477		10,596		554		10,552		89
Commercial and business lending	116,257		117,433		15,149		116,832		702
Commercial real estate — investor	23,494		24,430		1,244		23,541		461
Real estate construction	1,226		1,812		412		1,237		14
Commercial real estate lending	24,720		26,242		1,656		24,778		475
Total commercial	140,977		143,675		16,805		141,610		1,177
Residential mortgage	65,281		70,624		12,351		65,819		548
Home equity	20,337		22,451		9,732		20,504		248
Other consumer	1,276		1,332		221		1,291		8
Total consumer	86,894		94,407		22,304		87,614		804
Total loans(a)	$	227,871	$	238,082	$	39,109	$	229,224	$	1,981
Loans with no related allowance
Commercial and industrial	$	120,243	$	130,935	$	—	$	120,399	$	91
Commercial real estate — owner occupied	6,659		9,005		—		6,715		—
Commercial and business lending	126,902		139,940		—		127,114		91
Commercial real estate — investor	9,829		9,984		—		9,855		—
Real estate construction	—		—		—		—		—
Commercial real estate lending	9,829		9,984		—		9,855		—
Total commercial	136,731		149,924		—		136,969		91
Residential mortgage	6,738		7,020		—		6,841		35
Home equity	652		652		—		653		10
Other consumer	—		—		—		—		—
Total consumer	7,390		7,672		—		7,494		45
Total loans(a)	$	144,121	$	157,596	$	—	$	144,463	$	136
Total
Commercial and industrial	$	226,023	$	237,772	$	14,595	$	226,679	$	704
Commercial real estate — owner occupied	17,136		19,601		554		17,267		89
Commercial and business lending	243,159		257,373		15,149		243,946		793
Commercial real estate — investor	33,323		34,414		1,244		33,396		461
Real estate construction	1,226		1,812		412		1,237		14
Commercial real estate lending	34,549		36,226		1,656		34,633		475
Total commercial	277,708		293,599		16,805		278,579		1,268
Residential mortgage	72,019		77,644		12,351		72,660		583
Home equity	20,989		23,103		9,732		21,157		258
Other consumer	1,276		1,332		221		1,291		8
Total consumer	94,284		102,079		22,304		95,108		849
Total loans(a)	$	371,992	$	395,678	$	39,109	$	373,687	$	2,117

(a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 84% of the unpaid principal balance at March 31, 2016.

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The following table presents impaired loans at December 31, 2015.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	57,785	$	59,409	$	8,162	$	46,833	$	855
Commercial real estate — owner occupied	9,705		9,804		448		10,087		412
Commercial and business lending	67,490		69,213		8,610		56,920		1,267
Commercial real estate — investor	27,822		29,444		1,831		28,278		1,914
Real estate construction	1,450		2,154		453		1,667		66
Commercial real estate lending	29,272		31,598		2,284		29,945		1,980
Total commercial	96,762		100,811		10,894		86,865		3,247
Residential mortgage	66,590		71,084		12,462		68,183		2,374
Home equity	21,769		23,989		10,118		22,624		1,147
Other consumer	1,154		1,225		195		1,199		30
Total consumer	89,513		96,298		22,775		92,006		3,551
Total loans(a)	$	186,275	$	197,109	$	33,669	$	178,871	$	6,798
Loans with no related allowance
Commercial and industrial	$	65,083	$	72,259	$	—	$	79,573	$	1,657
Commercial real estate — owner occupied	6,221		6,648		—		6,534		15
Commercial and business lending	71,304		78,907		—		86,107		1,672
Commercial real estate — investor	2,736		2,840		—		2,763		90
Real estate construction	—		—		—		—		—
Commercial real estate lending	2,736		2,840		—		2,763		90
Total commercial	74,040		81,747		—		88,870		1,762
Residential mortgage	4,762		5,033		—		4,726		126
Home equity	544		544		—		544		30
Other consumer	—		—		—		—		—
Total consumer	5,306		5,577		—		5,270		156
Total loans(a)	$	79,346	$	87,324	$	—	$	94,140	$	1,918
Total
Commercial and industrial	$	122,868	$	131,668	$	8,162	$	126,406	$	2,512
Commercial real estate — owner occupied	15,926		16,452		448		16,621		427
Commercial and business lending	138,794		148,120		8,610		143,027		2,939
Commercial real estate — investor	30,558		32,284		1,831		31,041		2,004
Real estate construction	1,450		2,154		453		1,667		66
Commercial real estate lending	32,008		34,438		2,284		32,708		2,070
Total commercial	170,802		182,558		10,894		175,735		5,009
Residential mortgage	71,352		76,117		12,462		72,909		2,500
Home equity	22,313		24,533		10,118		23,168		1,177
Other consumer	1,154		1,225		195		1,199		30
Total consumer	94,819		101,875		22,775		97,276		3,707
Total loans(a)	$	265,621	$	284,433	$	33,669	$	273,011	$	8,716

(a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 82% of the unpaid principal balance at December 31, 2015.

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Troubled Debt Restructurings (“Restructured Loans”):

Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. See Note 1 “Summary of Significant Accounting Policies," in the Corporation’s 2015 Annual Report on Form 10-K for the Corporation's accounting policy for troubled debt restructurings. The Corporation had a recorded investment of over $4 million in loans modified in troubled debt restructurings for the three months ended March 31, 2016, of which approximately $470,000 was in accrual status and $4 million was in nonaccrual pending a sustained period of repayment. The following table presents nonaccrual and performing restructured loans by loan portfolio.

	March 31, 2016				December 31, 2015
	Performing Restructured Loans		Nonaccrual Restructured Loans(a)		Performing Restructured Loans		Nonaccrual Restructured Loans(a)
	($ in Thousands)
Commercial and industrial	$	28,908	$	2,711	$	29,293	$	1,714
Commercial real estate — owner occupied	7,693		2,689		7,877		2,703
Commercial real estate — investor	20,993		1,356		21,915		3,936
Real estate construction	386		182		510		177
Residential mortgage	19,807		23,845		19,870		24,592
Home equity	6,917		4,416		7,069		4,522
Other consumer	893		33		829		40
Total	$	85,597	$	35,232	$	87,363	$	37,684

(a) Nonaccrual restructured loans have been included within nonaccrual loans.

The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio during the three months ended March 31, 2016 and 2015, respectively, and the recorded investment and unpaid principal balance as of March 31, 2016 and 2015 respectively.

	Three Months Ended March 31, 2016					Three Months Ended March 31, 2015
	Number of Loans	Recorded Investment(a)		Unpaid Principal Balance(b)		Number of Loans	Recorded Investment(a)		Unpaid Principal Balance(b)
	($ in Thousands)
Commercial and industrial	7	$	1,483	$	1,522	2	$	196	$	208
Commercial real estate — owner occupied	1	125		130		5	3,585		3,641
Commercial real estate — investor	—	—		—		4	3,030		3,042
Real estate construction	1	10		55		—	—		—
Residential mortgage	30	2,062		2,124		30	2,816		2,864
Home equity	20	818		879		36	1,782		1,843
Total	59	$	4,498	$	4,710	77	$	11,409	$	11,598

(a) Represents post-modification outstanding recorded investment.

(b) Represents pre-modification outstanding recorded investment.

Restructured loan modifications may include payment schedule modifications, interest rate concessions, maturity date extensions, modification of note structure (A/B Note), non-reaffirmed Chapter 7 bankruptcies, principal reduction, or some combination of these concessions. During the three months ended March 31, 2016, restructured loan modifications of commercial and industrial, commercial real estate, and real estate construction loans primarily included maturity date extensions and payment schedule modifications. Restructured loan modifications of home equity and residential mortgage loans primarily included maturity date extensions, interest rate concessions, non-reaffirmed Chapter 7 bankruptcies, or a combination of these concessions for the three months ended March 31, 2016.

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The following table provides the number of loans modified in a troubled debt restructuring during the previous twelve months which subsequently defaulted during the three months ended March 31, 2016 and 2015, respectively, as well as the recorded investment in these restructured loans as of March 31, 2016 and 2015 respectively.

	Three Months Ended March 31, 2016			Three Month Ended March 31, 2015
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	($ in Thousands)
Commercial real estate — owner occupied	—	$	—	1	$	297
Real estate construction	1	10		—	—
Residential mortgage	7	1,151		16	1,239
Home equity	8	153		24	855
Total	16	$	1,314	41	$	2,391

All loans modified in a troubled debt restructuring are evaluated for impairment. The nature and extent of the impairment of restructured loans, including those which have experienced a subsequent payment default, is considered in the determination of an appropriate level of the allowance for loan losses.

A summary of the changes in the allowance for loan losses by portfolio segment for the three months ended March 31, 2016, was as follows.

$ in Thousands	Commercial and industrial			Commercial real estate - owner occupied			Commercial real estate - investor			Real estate construction			Residential mortgage			Home equity			Other consumer			Total
December 31, 2015	$	129,959		$	18,680		$	43,018		$	25,266		$	28,261		$	23,555		$	5,525		$	274,264
Charge offs	(16,894		)	(76		)	(176		)	(54		)	(1,390		)	(1,746		)	(909		)	(21,245		)
Recoveries	1,958			33			1,415			26			158			600			161			4,351
Net charge offs	(14,936		)	(43		)	1,239			(28		)	(1,232		)	(1,146		)	(748		)	(16,894		)
Provision for loan losses	24,470			(2,059		)	(2,233		)	(3,498		)	2,030			721			569			20,000
March 31, 2016	$	139,493		$	16,578		$	42,024		$	21,740		$	29,059		$	23,130		$	5,346		$	277,370
Allowance for loan losses:
Individually evaluated for impairment	$	14,005		$	74		$	—		$	—		$	14		$	—		$	—		$	14,093
Collectively evaluated for impairment	125,488			16,504			42,024			21,740			29,045			23,130			5,346			263,277
Total allowance for loan losses	$	139,493		$	16,578		$	42,024		$	21,740		$	29,059		$	23,130		$	5,346		$	277,370
Loans:
Individually evaluated for impairment	$	195,341		$	7,500		$	9,829		$	—		$	7,472		$	652		$	—		$	220,794
Collectively evaluated for impairment	6,316,307			909,785			3,266,904			1,184,398			5,936,985			982,342			409,725			19,006,446
Total loans	$	6,511,648		$	917,285		$	3,276,733		$	1,184,398		$	5,944,457		$	982,994		$	409,725		$	19,227,240

The allowance for credit losses is comprised of the allowance for loan losses and the allowance for unfunded commitments. The level of the allowance for loan losses represents management’s estimate of an amount appropriate to provide for probable credit losses in the loan portfolio at the balance sheet date. The allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb estimated probable losses related to unfunded credit facilities (including unfunded loan commitments and letters of credit) and is included in accrued expenses and other liabilities on the consolidated balance sheets. See Note 12 for additional information on the allowance for unfunded commitments.

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For comparison purposes, a summary of the changes in the allowance for loan losses by portfolio segment for the year ended December 31, 2015, was as follows.

$ in Thousands	Commercial and industrial			Commercial real estate - owner occupied			Commercial real estate - investor			Real estate construction			Residential mortgage			Home equity			Other consumer			Total
December 31, 2014	$	117,635		$	16,510		$	46,333		$	20,999		$	31,926		$	26,464		$	6,435		$	266,302
Charge offs	(27,687		)	(2,645		)	(4,645		)	(750		)	(5,636		)	(7,048		)	(3,869		)	(52,280		)
Recoveries	9,821			921			4,157			2,268			1,077			3,233			765			22,242
Net charge offs	(17,866		)	(1,724		)	(488		)	1,518			(4,559		)	(3,815		)	(3,104		)	(30,038		)
Provision for loan losses	30,190			3,894			(2,827		)	2,749			894			906			2,194			38,000
December 31, 2015	$	129,959		$	18,680		$	43,018		$	25,266		$	28,261		$	23,555		$	5,525		$	274,264
Allowance for loan losses:
Individually evaluated for impairment	$	7,522		$	—		$	229		$	—		$	166		$	46		$	—		$	7,963
Collectively evaluated for impairment	122,437			18,680			42,789			25,266			28,095			23,509			5,525			266,301
Total allowance for loan losses	$	129,959		$	18,680		$	43,018		$	25,266		$	28,261		$	23,555		$	5,525		$	274,264
Loans:
Individually evaluated for impairment	$	91,569		$	6,221		$	5,460		$	—		$	6,956		$	1,281		$	—		$	111,487
Collectively evaluated for impairment	6,099,114			911,991			3,228,806			1,162,145			5,776,311			1,004,521			419,968			18,602,856
Total loans	$	6,190,683		$	918,212		$	3,234,266		$	1,162,145		$	5,783,267		$	1,005,802		$	419,968		$	18,714,343

A summary of the changes in the allowance for unfunded commitments was as follows.

	Three Months Ended March 31, 2016		Year Ended December 31, 2015
	($ in Thousands)
Allowance for Unfunded Commitments:
Balance at beginning of period	$	24,400	$	24,900
Provision for unfunded commitments	—		(500		)
Balance at end of period	$	24,400	$	24,400

Note 8Goodwill and Other Intangible Assets

Goodwill:  Goodwill is not amortized but, instead, is subject to impairment tests on at least an annual basis, and more frequently if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The impairment testing process is conducted by assigning net assets and goodwill to each reporting unit. An initial qualitative evaluation is made to assess the likelihood of impairment and determine whether further quantitative testing to calculate the fair value is necessary. When the qualitative evaluation indicates that impairment is more likely than not, quantitative testing is required whereby the fair value of each reporting unit is calculated and compared to the recorded book value, “step one.” If the calculated fair value of the reporting unit exceeds its carrying value, goodwill is not considered impaired and “step two” is not considered necessary. If the carrying value of a reporting unit exceeds its calculated fair value, the impairment test continues (“step two”) by comparing the carrying value of the reporting unit’s goodwill to the implied fair value of goodwill. The implied fair value is computed by adjusting all assets and liabilities of the reporting unit to current fair value with the offset adjustment to goodwill. The adjusted goodwill balance is the implied fair value of the goodwill. An impairment charge is recognized if the carrying value of goodwill exceeds the implied fair value of goodwill.

The Corporation conducted its most recent annual impairment testing in May 2015, utilizing a qualitative assessment. Factors that management considered in this assessment included macroeconomic conditions, industry and market considerations, overall financial performance of the Corporation and each reporting unit (both current and projected), changes in management strategy, and changes in the composition or carrying amount of net assets. In addition, management considered the changes in both the Corporation’s common stock price and in the overall bank common stock index (based on the S&P 400 Regional Bank Sub-Industry Index), as well as the Corporation’s earnings per common share trend over the past year. Based on these assessments, management concluded that the 2015 annual qualitative impairment assessment indicated that it is more likely than not that the estimated fair value exceeded the carrying value (including goodwill) for each reporting unit. Therefore, a step one quantitative

23

analysis was not required. There were no events since the May 2015 impairment testing that have changed the Corporation's impairment assessment conclusion. There were no impairment charges recorded in 2015 or the first three months of 2016.

At March 31, 2016, the Corporation had goodwill of $972 million, compared to $969 million at December 31, 2015. Goodwill increased by approximately $3 million during the first quarter of 2016 as a result of two small insurance acquisitions. See Note 2 for additional information on the Corporation's acquisitions.

Other Intangible Assets:  The Corporation has other intangible assets that are amortized, consisting of core deposit intangibles, other intangibles (primarily related to customer relationships acquired in connection with the Corporation’s insurance agency acquisitions), and mortgage servicing rights. Core deposit intangibles of approximately $15 million were fully amortized in 2015 and have been removed from both the gross carrying amount and the accumulated amortization for 2016. Other intangibles increased by approximately $1 million during the first quarter of 2016 for the customer relationships associated with two small insurance acquisitions. See Note 2 for additional information on the Corporation's acquisitions. For core deposit intangibles and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows.

	Three Months Ended March 31, 2016			Year Ended  December 31, 2015
	($ in Thousands)
Core deposit intangibles:
Gross carrying amount	$	4,385		$	19,545
Accumulated amortization	(4,062		)	(19,152		)
Net book value	$	323		$	393
Amortization during the year	$	70		$	1,404
Other intangibles:
Gross carrying amount	$	32,410		$	31,398
Accumulated amortization	(15,767		)	(15,333		)
Net book value	$	16,643		$	16,065
Additions during the period	$	1,012		$	12,115
Amortization during the year	$	434		$	1,690

The Corporation sells residential mortgage loans in the secondary market and typically retains the right to service the loans sold. Mortgage servicing rights are amortized in proportion to and over the period of estimated net servicing income, and assessed for impairment at each reporting date.

The Corporation periodically evaluates its mortgage servicing rights asset for impairment. Impairment is assessed based on fair value at each reporting date using estimated prepayment speeds of the underlying mortgage loans serviced and stratifications based on the risk characteristics of the underlying loans (predominantly loan type and note interest rate). As mortgage interest rates fall, prepayment speeds are usually faster and the value of the mortgage servicing rights asset generally decreases, requiring additional valuation reserve. Conversely, as mortgage interest rates rise, prepayment speeds are usually slower and the value of the mortgage servicing rights asset generally increases, requiring less valuation reserve. A valuation allowance is established, through a charge to earnings, to the extent the amortized cost of the mortgage servicing rights exceeds the estimated fair value by stratification. If it is later determined that all or a portion of the temporary impairment no longer exists for a stratification, the valuation is reduced through a recovery to earnings. An other-than-temporary impairment (i.e., recoverability is considered remote when considering interest rates and loan pay off activity) is recognized as a write-down of the mortgage servicing rights asset and the related valuation allowance (to the extent a valuation allowance is available) and then against earnings. A direct write-down permanently reduces the carrying value of the mortgage servicing rights asset and valuation allowance, precluding subsequent recoveries. See Note 12 for a discussion of the recourse provisions on sold residential mortgage loans. See Note 13 which further discusses fair value measurement relative to the mortgage servicing rights asset.

24

A summary of changes in the balance of the mortgage servicing rights asset and the mortgage servicing rights valuation allowance was as follows.

	Three Months Ended  March 31, 2016			Year Ended December 31, 2015
	($ in Thousands)
Mortgage servicing rights
Mortgage servicing rights at beginning of period	$	62,150		$	61,379
Additions	1,856			12,372
Amortization	(2,874		)	(11,601		)
Mortgage servicing rights at end of period	$	61,132		$	62,150
Valuation allowance at beginning of period	(809		)	(1,234		)
(Additions) recoveries, net	(909		)	425
Valuation allowance at end of period	(1,718		)	(809		)
Mortgage servicing rights, net	$	59,414		$	61,341
Fair value of mortgage servicing rights	$	61,410		$	70,686
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$	7,876,888		$	7,915,224
Mortgage servicing rights, net to servicing portfolio	0.75		%	0.77		%
Mortgage servicing rights expense (1)	$	3,783		$	11,176

(1) Includes the amortization of mortgage servicing rights and additions / recoveries to the valuation allowance of mortgage servicing rights, and is a component of mortgage banking, net in the consolidated statements of income.

The following table shows the estimated future amortization expense for amortizing intangible assets. The projections of amortization expense are based on existing asset balances, the current interest rate environment, and prepayment speeds as of March 31, 2016. The actual amortization expense the Corporation recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements, and events or circumstances that indicate the carrying amount of an asset may not be recoverable.

Estimated Amortization Expense	Core Deposit Intangibles		Other Intangibles		Mortgage Servicing Rights
	($ in Thousands)
Nine months ending December 31, 2016	$	211	$	1,378	$	8,850
2017	112		1,786		9,674
2018	—		1,756		7,761
2019	—		1,457		6,313
2020	—		1,340		5,169
2021	—		1,316		4,265
Beyond 2021	—		7,610		19,100
Total Estimated Amortization Expense	$	323	$	16,643	$	61,132

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Note 9Short and Long-Term Funding

The components of short-term funding (funding with original contractual maturities of one year or less) and long-term funding (funding with original contractual maturities greater than one year) were as follows.

	March 31, 2016			December 31, 2015
	($ in Thousands)
Short-Term Funding
Federal funds purchased	$	74,985		$	47,870
Securities sold under agreements to repurchase	508,262			383,568
Federal funds purchased and securities sold under agreements to repurchase	$	583,247		$	431,438
FHLB advances	770,000			335,000
Commercial paper	64,161			67,978
Other short-term funding	834,161			402,978
Total short-term funding	$	1,417,408		$	834,416
Long-Term Funding
FHLB advances	$	2,365,216		$	1,750,225
Senior notes, at par	250,000			680,000
Subordinated notes, at par	250,000			250,000
Other long-term funding and capitalized costs (1)	(3,900		)	(4,061		)
Total long-term funding	2,861,316			2,676,164
Total short and long-term funding	$	4,278,724		$	3,510,580
(1) Debt issuance costs are now reflected on the balance sheet with the related debt issued rather than within other assets.  See Note 3 for additional information on this new accounting standard.

Securities sold under agreements to repurchase ("repurchase agreements")

The Corporation enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. Under these arrangements, the Corporation may transfer legal control over the assets but still retain effective control through an agreement that both entitles and obligates the Corporation to repurchase the assets. The obligation to repurchase the securities is reflected as a liability on the Corporation’s consolidated balance sheets, while the securities underlying the repurchase agreements remain in the respective investment securities asset accounts (i.e., there is no offsetting or netting of the investment securities assets with the repurchase agreement liabilities). See Note 11 for additional disclosures on balance sheet offsetting.

The Corporation utilizes securities sold under agreements to repurchase to facilitate the needs of its customers. As of March 31, 2016, the Corporation pledged GSE mortgage-related securities with a fair value of $643 million as collateral for the repurchase agreements. Securities pledged as collateral under repurchase agreements are maintained with the Corporation's safekeeping agents and are monitored on a daily basis due to the market risk of fair value changes in the underlying securities. The Corporation generally pledges excess securities to ensure there is sufficient collateral to satisfy short-term fluctuations in both the repurchase agreement balances and the fair value of the underlying securities.

The remaining contractual maturity of the securities sold under agreements to repurchase in the consolidated balance sheets as of March 31, 2016 and December 31, 2015 are presented in the following table.

	Remaining Contractual Maturity of the Agreements
March 31, 2016	Overnight and Continuous		Up to 30 days		30-90 days		Greater than 90 days		Total
					($ in Thousands)
Repurchase agreements
GSE securities	$	508,262	$	—	$	—	$	—	$	508,262
Total	$	508,262	$	—	$	—	$	—	$	508,262
December 31, 2015
Repurchase agreements
GSE securities	$	383,568	$	—	$	—	$	—	$	383,568
Total	$	383,568	$	—	$	—	$	—	$	383,568

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Long-term funding:

FHLB advances:  At March 31, 2016, the long-term FHLB advances had a weighted average interest rate of 0.29%, compared to 0.24% at December 31, 2015. The FHLB advances are indexed to the FHLB discount note and re-price at varying intervals. The advances offer flexible, low cost, long-term funding that improves the Corporation’s liquidity profile.

2011 Senior Notes:  In March 2011, the Corporation issued $300 million of senior notes due March 2016, and callable February 2016, with a 5.125% fixed coupon at a discount. In September 2011, the Corporation “re-opened” the offering and issued an additional $130 million of the same notes at a premium. All notes were redeemed in February 2016 at par.

2014 Senior Notes:  In November 2014, the Corporation issued $250 million of senior notes, due November 2019, and callable October 2019. The senior notes have a fixed coupon interest rate of 2.75% and were issued at a discount.

2014 Subordinated Notes:  In November 2014, the Corporation issued $250 million of 10-year subordinated notes, due January 2025, and callable October 2024. The subordinated notes have a fixed coupon interest rate of 4.25% and were issued at a discount.

Note 10Derivative and Hedging Activities

The Corporation facilitates customer borrowing activity by providing various interest rate risk management, commodity hedging, and foreign currency exchange solutions through its capital markets area. To date, all of the notional amounts of customer transactions have been matched with a mirror hedge with another counterparty. The Corporation has used, and may use again in the future, derivative instruments to hedge the variability in interest payments or protect the value of certain assets and liabilities recorded on its consolidated balance sheets from changes in interest rates. The predominant derivative and hedging activities include interest rate-related instruments (swaps and caps), foreign currency exchange forwards, commodity contracts, written options, purchased options, and certain mortgage banking activities.

The contract or notional amount of a derivative is used to determine, along with the other terms of the derivative, the amounts to be exchanged between the counterparties. The Corporation is exposed to credit risk in the event of nonperformance by counterparties to financial instruments. To mitigate the counterparty risk, interest rate and commodity-related instruments generally contain language outlining collateral pledging requirements for each counterparty. Collateral must be posted when the market value exceeds certain mutually agreed upon threshold limits. The Corporation was required to pledge $28 million of investment securities as collateral at March 31, 2016, and pledged $9 million of investment securities as collateral at December 31, 2015. Federal regulations require the Corporation to clear all LIBOR interest rate swaps through a clearing house if it can be cleared. As such, the Corporation is required to pledge cash collateral for the margin. At March 31, 2016, the Corporation posted cash collateral for the margin of $31 million, compared to $22 million at December 31, 2015.

The Corporation’s derivative and hedging instruments are recorded at fair value on the consolidated balance sheets. The fair value of the Corporation’s interest rate-related instruments is determined using discounted cash flow analysis on the expected cash flows of each derivative and also includes a nonperformance / credit risk component (credit valuation adjustment). See Note 13 for additional fair value information and disclosures.

The table below identifies the balance sheet category and fair values of the Corporation’s free standing derivative instruments, which are not designated as hedging instruments.

	March 31, 2016						December 31, 2015
($ in Thousands)	Notional Amount		Fair Value			Balance Sheet Category	Notional Amount		Fair Value			Balance Sheet Category
Interest rate-related instruments — customer and mirror	$	1,806,688	$	47,780		Trading assets	$	1,665,965	$	29,391		Trading assets
Interest rate-related instruments — customer and mirror	1,806,688		(50,145		)	Trading liabilities	1,665,965		(30,886		)	Trading liabilities
Interest rate lock commitments (mortgage)	418,136		2,689			Other assets	271,530		958			Other assets
Forward commitments (mortgage)	249,866		(1,732		)	Other liabilities	231,798		403			Other assets
Foreign currency exchange forwards	124,617		4,203			Trading assets	72,976		1,532			Trading assets
Foreign currency exchange forwards	116,751		(4,097		)	Trading liabilities	65,649		(1,398		)	Trading liabilities
Commodity contracts	43,646		1,104			Trading assets	44,380		1,269			Trading assets
Commodity contracts	43,770		(981		)	Trading liabilities	44,256		(1,146		)	Trading liabilities
Purchased options (time deposit)	103,475		2,228			Other assets	104,582		2,715			Other assets
Written options (time deposit)	103,475		(2,228		)	Other liabilities	104,582		(2,715		)	Other liabilities

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The table below identifies the income statement category of the gains and losses recognized in income on the Corporation’s derivative instruments not designated as hedging instruments.

	Income Statement Category of Gain / (Loss) Recognized in Income	For the Three Months Ended March 31,
($ in Thousands)		2016			2015
Derivative Instruments:
Interest rate-related instruments — customer and mirror, net	Capital market fees, net	$	(870	)	$	(294	)
Interest rate lock commitments (mortgage)	Mortgage banking, net	1,731			1,738
Forward commitments (mortgage)	Mortgage banking, net	(2,135		)	640
Foreign currency exchange forwards	Capital market fees, net	(28		)	66
Commodity contracts	Capital market fees, net	—			—

Free Standing Derivatives

The Corporation enters into various derivative contracts which are designated as free standing derivative contracts. Free standing derivative products are entered into primarily for the benefit of commercial customers seeking to manage their exposures to interest rate risk, foreign currency, and commodity prices. These derivative contracts are not designated against specific assets and liabilities on the balance sheet or forecasted transactions and, therefore, do not qualify for hedge accounting treatment. Such derivative contracts are carried at fair value on the consolidated balance sheets with changes in the fair value recorded as a component of Capital market fees, net, and typically include interest rate-related instruments (swaps and caps), foreign currency exchange forwards, and commodity contracts. See Note 11 for additional information and disclosures on balance sheet offsetting.

Interest rate-related instruments: The Corporation provides interest rate risk management services to commercial customers, primarily forward interest rate swaps and caps. The Corporation’s market risk from unfavorable movements in interest rates related to these derivative contracts is generally economically hedged by concurrently entering into offsetting derivative contracts. The offsetting derivative contracts have identical notional values, terms and indices.

Foreign currency exchange forwards: The Corporation provides foreign currency exchange services to customers, primarily forward contracts. Our customers enter into a foreign currency exchange forward with the Corporation as a means for them to mitigate exchange rate risk. The Corporation mitigates its risk by then entering into an offsetting foreign currency exchange derivative contract. Such foreign currency exchange contracts are carried at fair value on the consolidated balance sheets with changes in fair value recorded as a component of Capital market fees, net.

Commodity contracts: Commodity contracts are entered into primarily for the benefit of commercial customers seeking to manage their exposure to fluctuating commodity prices. The Corporation mitigates its risk by then entering into an offsetting commodity derivative contract. Commodity contracts are carried at fair value on the consolidated balance sheets with changes in fair value recorded as a component of Capital market fees, net.

Mortgage derivatives

Interest rate lock commitments to originate residential mortgage loans held for sale and forward commitments to sell residential mortgage loans are considered derivative instruments, and the fair value of these commitments is recorded on the consolidated balance sheets with the changes in fair value recorded as a component of mortgage banking, net.

Written and purchased options (time deposit)

Historically, the Corporation had entered into written and purchased option derivative instruments to facilitate an equity linked time deposit product (the “Power CD”), which the Corporation ceased offering in September 2013. The Power CD was a time deposit that provided the purchaser a guaranteed return of principal at maturity plus a potential equity return (a written option), while the Corporation received a known stream of funds based on the equity return (a purchased option). The written and purchased options are mirror derivative instruments which are carried at fair value on the consolidated balance sheets.

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Note 11Balance Sheet Offsetting

Interest Rate-Related Instruments and Commodity Contracts (“Interest and Commodity Agreements”)

The Corporation enters into interest rate-related instruments to facilitate the interest rate risk management strategies of commercial customers. The Corporation also enters into commodity contracts to manage commercial customers' exposure to fluctuating commodity prices. The Corporation mitigates these risks by entering into equal and offsetting interest and commodity agreements with highly rated third party financial institutions. The Corporation is party to master netting arrangements with its financial institution counterparties that creates a single net settlement of all legal claims or obligations to pay or receive the net amount of settlement of the individual interest and commodity agreements. Collateral, usually in the form of investment securities and cash, is posted by the counterparty with net liability positions in accordance with contract thresholds. The Corporation does not offset assets and liabilities under these arrangements for financial statement presentation purposes. See Note 10 for additional information on the Corporation’s derivative and hedging activities.

Securities Sold Under Agreements to Repurchase (“Repurchase Agreements”)

The Corporation enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. These repurchase agreements are accounted for as collateralized financing arrangements (i.e., secured borrowings) and not as a sale and subsequent repurchase of securities (i.e., there is no offsetting or netting of the investment securities assets with the repurchase agreement liabilities). The right of set-off for a repurchase agreement resembles a secured borrowing, whereby the collateral would be used to settle the fair value of the repurchase agreement should the Corporation be in default (e.g., fails to make an interest payment to the counterparty). In addition, the Corporation does not enter into reverse repurchase agreements; therefore, there is no such offsetting to be done with the repurchase agreements. See Note 9 for additional disclosures on repurchase agreements.

The following table presents the assets and liabilities subject to an enforceable master netting arrangement. The interest and commodity agreements we have with our commercial customers are not subject to an enforceable master netting arrangement, and therefore, are excluded from this table.

	Gross amounts recognized						Gross amounts not offset in the balance sheet
			Gross amounts offset in the balance sheet		Net amounts presented in the balance sheet		Financial instruments			Collateral			Net amount
	($ in Thousands)
March 31, 2016
Derivative assets:
Interest and commodity agreements	$	823	$	—	$	823	$	(823	)	$	—		$	—
Derivative liabilities:
Interest and commodity agreements	$	48,700	$	—	$	48,700	$	(823	)	$	(47,877	)	$	—
December 31, 2015
Derivative assets:
Interest and commodity instruments	$	1,466	$	—	$	1,466	$	(1,466	)	$	—		$	—
Derivative liabilities:
Interest and commodity instruments	$	30,200	$	—	$	30,200	$	(1,466	)	$	(28,734	)	$	—

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Note 12Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings

The Corporation utilizes a variety of financial instruments in the normal course of business to meet the financial needs of its customers and to manage its own exposure to fluctuations in interest rates. These financial instruments include lending-related and other commitments (see below) as well as derivative instruments (see Note 10). The following is a summary of lending-related commitments.

	March 31, 2016		December 31, 2015
	($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(1)(2)	$	7,315,642	$	7,402,518
Commercial letters of credit(1)	7,782		9,945
Standby letters of credit(3)	278,740		296,508

1) These off-balance sheet financial instruments are exercisable at the market rate prevailing at the date the underlying transaction will be completed and, thus, are deemed to have no current fair value, or the fair value is based on fees currently charged to enter into similar agreements and is not material at March 31, 2016 or December 31, 2015.

2) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 10.

3) The Corporation has established a liability of $3 million at both March 31, 2016 and December 31, 2015, as an estimate of the fair value of these financial instruments.

Lending-related Commitments

As a financial services provider, the Corporation routinely enters into commitments to extend credit. Such commitments are subject to the same credit policies and approval process accorded to loans made by the Corporation, with each customer’s creditworthiness evaluated on a case-by-case basis. The commitments generally have fixed expiration dates or other termination clauses and may require the payment of a fee. The Corporation’s exposure to credit loss in the event of nonperformance by the other party to these financial instruments is represented by the contractual amount of those instruments. The amount of collateral obtained, if deemed necessary by the Corporation upon extension of credit, is based on management’s credit evaluation of the customer. Since a significant portion of commitments to extend credit are subject to specific restrictive loan covenants or may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash flow requirements. An allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb estimated probable losses related to unfunded commitments (including unfunded loan commitments and letters of credit). The allowance for unfunded commitments totaled $24 million at both March 31, 2016 and December 31, 2015, and is included in accrued expenses and other liabilities on the consolidated balance sheets.

Lending-related commitments include commitments to extend credit, commitments to originate residential mortgage loans held for sale, commercial letters of credit, and standby letters of credit. Commitments to extend credit are legally binding agreements to lend to customers at predetermined interest rates, as long as there is no violation of any condition established in the contracts. Interest rate lock commitments to originate residential mortgage loans held for sale and forward commitments to sell residential mortgage loans are considered derivative instruments, and the fair value of these commitments is recorded on the consolidated balance sheets. The Corporation’s derivative and hedging activity is further described in Note 10. Commercial and standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Commercial letters of credit are issued specifically to facilitate commerce and typically result in the commitment being drawn on when the underlying transaction is consummated between the customer and the third party, while standby letters of credit generally are contingent upon the failure of the customer to perform according to the terms of the underlying contract with the third party.

Other Commitments

The Corporation has principal investment commitments to provide capital-based financing to private and public companies through either direct investments in specific companies or through investment funds and partnerships. The timing of future cash requirements to fund such commitments is generally dependent on the investment cycle, whereby privately held companies are funded by private equity investors and ultimately sold, merged, or taken public through an initial offering, which can vary based on overall market conditions, as well as the nature and type of industry in which the companies operate. The Corporation also invests in unconsolidated projects including low-income housing, new market tax credit projects, and historic tax credit projects to promote the revitalization of primarily low-to-moderate-income neighborhoods throughout the local communities of its bank subsidiary. As a limited partner in these unconsolidated projects, the Corporation is allocated tax credits and deductions associated with the underlying projects. The aggregate carrying value of these investments at March 31, 2016, was $53 million, compared to $52 million at December 31, 2015, included in other assets on the consolidated balance sheets. Related to these investments, the Corporation had remaining commitments to fund of $62 million at March 31, 2016, and $61 million at December 31, 2015.

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Legal Proceedings

The Corporation is party to various pending and threatened claims and legal proceedings arising in the normal course of business activities, some of which involve claims for substantial amounts. Although there can be no assurance as to the ultimate outcomes, the Corporation believes it has meritorious defenses to the claims asserted against it in its currently outstanding matters, including the matters described below, and with respect to such legal proceedings, intends to continue to defend itself vigorously. The Corporation will consider settlement of cases when, in management’s judgment, it is in the best interests of both the Corporation and its shareholders.

On at least a quarterly basis, the Corporation assesses its liabilities and contingencies in connection with all pending or threatened claims and litigation, utilizing the most recent information available. On a matter by matter basis, an accrual for loss is established for those matters which the Corporation believes it is probable that a loss may be incurred and that the amount of such loss can be reasonably estimated. Once established, each accrual is adjusted as appropriate to reflect any subsequent developments. Accordingly, management’s estimate will change from time to time, and actual losses may be more or less than the current estimate. For matters where a loss is not probable, or the amount of the loss cannot be estimated, no accrual is established.

Resolution of legal claims is inherently unpredictable, and in many legal proceedings various factors exacerbate this inherent unpredictability, including where the damages sought are unsubstantiated or indeterminate, it is unclear whether a case brought as a class action will be allowed to proceed on that basis, discovery is not complete, the proceeding is not yet in its final stages, the matters present legal uncertainties, there are significant facts in dispute, there are a large number of parties (including where it is uncertain how liability, if any, will be shared among multiple defendants), or there is a wide range of potential results.

A lawsuit, R.J. ZAYED v. Associated Bank, N.A., was filed in the United States District Court for the District of Minnesota on January 29, 2013. The lawsuit relates to a Ponzi scheme perpetrated by Oxford Global Partners and related entities (“Oxford”) and individuals and was brought by the receiver for Oxford. Oxford was a depository customer of Associated Bank (the "Bank"). The lawsuit claims that the Bank is liable for failing to uncover the Oxford Ponzi scheme, and specifically alleges the Bank aided and abetted (1) the fraudulent scheme; (2) a breach of fiduciary duty; (3) conversion; and (4) false representations and omissions. The lawsuit seeks unspecified consequential and punitive damages. The District Court granted the Bank’s motion to dismiss the complaint on September 30, 2013. On March 2, 2015, the U.S. Court of Appeals for the Eighth Circuit reversed the District Court and remanded the case back to the District Court for further proceedings. It is not possible for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss at this time. A lawsuit by investors in the same Ponzi scheme, Herman Grad, et al v. Associated Bank, N.A., brought in Brown County, Wisconsin in October 2009 was dismissed by the circuit court, and the dismissal was affirmed by the Wisconsin Court of Appeals in June 2011 in an unpublished opinion.

On May 22, 2015, the Bank entered into a Conciliation Agreement ("Conciliation Agreement") with the U.S. Department of Housing and Urban Development ("HUD") which resolved the HUD investigation into the Bank's lending practices during the years 2008-2010. The Bank's commitments under the Conciliation Agreement are spread over a three-year period and include commitments to do the following in minority communities: make mortgage loans of approximately $196 million; open one branch and four loan production offices; establish special financing programs; make affordable home repair grants; engage in affirmative marketing outreach; provide financial education programs; and make grants to support community reinvestment training and education. The cost of these commitments will be spread over four calendar years and is not expected to have a material impact on the Corporation's financial condition or results of operation.

Beginning in late 2013, the Corporation began reviewing a variety of legacy products provided by third parties, including debt protection and identity protection products. In connection with this review, the Corporation has made, and plans to make, remediation payments to affected customers and former customers, and has reserved accordingly.

A variety of consumer products, including the legacy debt protection and identity protection products referred to above, and mortgage and deposit products, and certain fees and charges related to such products, have come under increased regulatory scrutiny. It is possible that regulatory authorities could bring enforcement actions, including civil money penalties, or take other actions against the Corporation and the Bank in regard to these consumer products. The Bank could also determine of its own accord, or be required by regulators, to refund or otherwise make remediation payments to customers in connection with these products. It is not possible at this time for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss related to such matters.

Two complaints were filed against the Bank on January 11, 2016 in the United States Bankruptcy Court for the Northern District of Illinois, Eastern Division in connection with the In re: World Marketing Chicago, LLC, et al Chapter 11 bankruptcy proceeding. In the first complaint, The Official Committee of Unsecured Creditors of World Marketing Chicago, LLC, et al v. Associated Bank, N.A., the plaintiff seeks to avoid guarantees and pledges of collateral given by the debtors to secure a revolving financing

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commitment of $6 million to the debtors’ parent company from the Bank. The plaintiff alleges a variety of legal theories under federal and state law, including fraudulent conveyance, preferential transfer and conversion, in support of its position. The plaintiff seeks return of approximately $4 million paid to the Bank and the avoidance of the security interest in the collateral securing the remaining approximately $1 million of indebtedness to the Bank. The Bank intends to vigorously defend this lawsuit. In the second complaint, American Funds Service Company v. Associated Bank, N.A., the plaintiff alleges that approximately $600,000 of funds it had advanced to the World Marketing entities to apply towards future postage fees was swept by the Bank from World Marketing’s bank accounts. Plaintiff seeks the return of such funds from the Bank under several theories, including Sec. 541(d) of the Bankruptcy Code, the creation of a resulting trust, and unjust enrichment. The Bank intends to vigorously defend this lawsuit. It is not possible for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss at this time with respect to these two lawsuits.

Mortgage Repurchase Reserve

The Corporation sells residential mortgage loans to investors in the normal course of business. Residential mortgage loans sold to others are predominantly conventional residential first lien mortgages originated under our usual underwriting procedures, and are most often sold on a nonrecourse basis, primarily to the GSEs. The Corporation’s agreements to sell residential mortgage loans in the normal course of business usually require certain representations and warranties on the underlying loans sold, related to credit information, loan documentation, collateral, and insurability. Subsequent to being sold, if a material underwriting deficiency or documentation defect is discovered, the Corporation may be obligated to repurchase the loan or reimburse the GSEs for losses incurred (collectively, “make whole requests”). The make whole requests and any related risk of loss under the representations and warranties are largely driven by borrower performance.

As a result of make whole requests, the Corporation has repurchased loans with principal balances of approximately $126,000 and $3 million during the three months ended March 31, 2016 and the year ended December 31, 2015, respectively, and paid loss reimbursement or settlement claims of approximately $3,000 and $133,000 for the three months ended March 31, 2016 and the year ended December 31, 2015, respectively. Make whole requests during 2015 and the first three months of 2016 generally arose from loans sold during the period of January 1, 2012 to March 31, 2016, which total $7.9 billion at the time of sale, and consisted primarily of loans sold to GSEs. As of March 31, 2016, approximately $5.7 billion of these sold loans remain outstanding.

The balance in the mortgage repurchase reserve at the balance sheet date reflects the estimated amount of potential loss the Corporation could incur from repurchasing a loan, as well as loss reimbursements, indemnifications, and other settlement resolutions. The following summarizes the changes in the mortgage repurchase reserve.

	For the Three Months Ended March 31, 2016			For the Year Ended December 31, 2015
	($ in Thousands)
Balance at beginning of period	$	1,197		$	3,258
Repurchase provision expense	70			428
Adjustments to provision expense	—			(2,450		)
Charge offs, net	(3		)	(39		)
Balance at end of period	$	1,264		$	1,197

The Corporation may also sell residential mortgage loans with limited recourse (limited in that the recourse period ends prior to the loan’s maturity, usually after certain time and / or loan paydown criteria have been met), whereby repurchase could be required if the loan had defined delinquency issues during the limited recourse periods. At March 31, 2016, and December 31, 2015, there were approximately $60 million and $68 million, respectively, of residential mortgage loans sold with such recourse risk. There have been limited instances and immaterial historical losses on repurchases for recourse under the limited recourse criteria.

The Corporation has a subordinate position to the FHLB in the credit risk on residential mortgage loans it sold to the FHLB in exchange for a monthly credit enhancement fee. The Corporation has not sold loans to the FHLB with such credit risk retention since February 2005. At March 31, 2016 and December 31, 2015, there were $122 million and $132 million, respectively, of such residential mortgage loans with credit risk recourse, upon which there have been negligible historical losses to the Corporation.

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Note 13Fair Value Measurements

Fair value represents the estimated price at which an orderly transaction to sell an asset or to transfer a liability would take place between market participants at the measurement date under current market conditions (i.e., an exit price concept).

Following is a description of the valuation methodologies used for the Corporation’s more significant instruments measured on a recurring basis at fair value, including the general classification of such instruments pursuant to the valuation hierarchy.

Investment securities available for sale:  Where quoted prices are available in an active market, investment securities are classified in Level 1 of the fair value hierarchy. If quoted market prices are not available for the specific security, then fair values are estimated by using pricing models, quoted prices of securities with similar characteristics or discounted cash flows, with consideration given to the nature of the quote and the relationship of recently evidenced market activity to the fair value estimate, and are classified in Level 2 of the fair value hierarchy. Lastly, in certain cases where there is limited activity or less transparency around inputs to the estimated fair value, securities are classified within Level 3 of the fair value hierarchy. To validate the fair value estimates, assumptions, and controls, the Corporation looks to transactions for similar instruments and utilizes independent pricing provided by third party vendors or brokers and relevant market indices. While none of these sources are solely indicative of fair value, they serve as directional indicators for the appropriateness of the Corporation’s fair value estimates. The Corporation has determined that the fair value measures of its investment securities are classified predominantly within Level 1 or 2 of the fair value hierarchy. See Note 6 for additional disclosure regarding the Corporation’s investment securities.

Derivative financial instruments (interest rate-related instruments):  The Corporation has used, and may use again in the future, interest rate swaps to manage its interest rate risk. In addition, the Corporation offers customer interest rate-related instruments (swaps and caps) to service our customers’ needs, for which the Corporation simultaneously enters into offsetting derivative financial instruments (i.e., mirror interest rate-related instruments) with third parties to manage its interest rate risk associated with these financial instruments. The valuation of the Corporation’s derivative financial instruments is determined using discounted cash flow analysis on the expected cash flows of each derivative and, also includes a nonperformance / credit risk component (credit valuation adjustment). See Note 10 for additional disclosure regarding the Corporation’s interest rate-related instruments.

The discounted cash flow analysis component in the fair value measurements reflects the contractual terms of the derivative financial instruments, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. More specifically, the fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments), with the variable cash payments (or receipts) based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. Likewise, the fair values of interest rate options (i.e., interest rate caps) are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates fall below (or rise above) the strike rate of the floors (or caps), with the variable interest rates used in the calculation of projected receipts on the floor (or cap) based on an expectation of future interest rates derived from observable market interest rate curves and volatilities.

The Corporation also incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative financial instruments for the effect of nonperformance risk, the Corporation has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees.

While the Corporation has determined that the majority of the inputs used to value its derivative financial instruments fall within Level 2 of the fair value hierarchy, the credit valuation adjustments utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. The Corporation has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions as of March 31, 2016, and December 31, 2015, and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivative financial instruments. Therefore, the Corporation has determined that the fair value measures of its derivative financial instruments in their entirety are classified within Level 2 of the fair value hierarchy.

Derivative financial instruments (foreign currency exchange forwards):  The Corporation provides foreign currency exchange services to customers. In addition, the Corporation may enter into a foreign currency exchange forward to mitigate the exchange rate risk attached to the cash flows of a loan or as an offsetting contract to a forward entered into as a service to our customer. The valuation of the Corporation’s foreign currency exchange forwards is determined using quoted prices of foreign currency exchange forwards with similar characteristics, with consideration given to the nature of the quote and the relationship of recently evidenced market activity to the fair value estimate, and are classified in Level 2 of the fair value hierarchy. See Note 10 for additional disclosures regarding the Corporation’s foreign currency exchange forwards.

Derivative financial instruments (commodity contracts):  The Corporation enters into commodity contracts to manage commercial customers' exposure to fluctuating commodity prices, for which the Corporation simultaneously enters into offsetting derivative

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financial instruments (i.e., mirror commodity contracts) with third parties to manage its risk associated with these financial instruments. The valuation of the Corporation’s commodity contracts is determined using quoted prices of the underlying instrument, and are classified in Level 2 of the fair value hierarchy. See Note 10 for additional disclosures regarding the Corporation’s commodity contracts.

Derivative financial instruments (mortgage derivatives):  Mortgage derivatives include interest rate lock commitments to originate residential mortgage loans held for sale to individual customers and forward commitments to sell residential mortgage loans to various investors. The Corporation relies on an internal valuation model to estimate the fair value of its interest rate lock commitments to originate residential mortgage loans held for sale, which includes grouping the interest rate lock commitments by interest rate and terms, applying an estimated pull-through rate based on historical experience, and then multiplying by quoted investor prices determined to be reasonably applicable to the loan commitment groups based on interest rate, terms, and rate lock expiration dates of the loan commitment groups.

The Corporation also relies on an internal valuation model to estimate the fair value of its forward commitments to sell residential mortgage loans (i.e., an estimate of what the Corporation would receive or pay to terminate the forward delivery contract based on market prices for similar financial instruments), which includes matching specific terms and maturities of the forward commitments against applicable investor pricing available. While there are Level 2 and 3 inputs used in the valuation models, the Corporation has determined that the majority of the inputs significant in the valuation of both of the mortgage derivatives fall within Level 3 of the fair value hierarchy. See Note 10 for additional disclosure regarding the Corporation’s mortgage derivatives.

Following is a description of the valuation methodologies used for the Corporation’s more significant instruments measured on a nonrecurring basis at the lower of amortized cost or estimated fair value, including the general classification of such instruments pursuant to the valuation hierarchy.

Loans Held for Sale:  Loans held for sale, which consist generally of current production of certain fixed-rate, first-lien residential mortgage loans, are carried at the lower of cost or estimated fair value. The estimated fair value was based on what secondary markets are currently offering for portfolios with similar characteristics, which the Corporation classifies as a Level 2 nonrecurring fair value measurement.

Impaired Loans:  The Corporation considers a loan impaired when it is probable that the Corporation will be unable to collect all amounts due according to the original contractual terms of the note agreement, including both principal and interest. Management has determined that commercial and consumer loan relationships that have nonaccrual status or have had their terms restructured in a troubled debt restructuring meet this impaired loan definition. For individually evaluated impaired loans, the amount of impairment is based upon the present value of expected future cash flows discounted at the loan’s effective interest rate, the estimated fair value of the underlying collateral for collateral-dependent loans, or the estimated liquidity of the note. See Note 7 for additional information regarding the Corporation’s impaired loans.

Mortgage servicing rights:  Mortgage servicing rights do not trade in an active, open market with readily observable prices. While sales of mortgage servicing rights do occur, the precise terms and conditions typically are not readily available to allow for a “quoted price for similar assets” comparison. Accordingly, the Corporation utilizes an independent valuation from a third party which uses a discounted cash flow model to estimate the fair value of its mortgage servicing rights. The valuation model incorporates prepayment assumptions to project mortgage servicing rights cash flows based on the current interest rate scenario, which is then discounted to estimate an expected fair value of the mortgage servicing rights. The valuation model considers portfolio characteristics of the underlying mortgages, contractually specified servicing fees, prepayment assumptions, discount rate assumptions, delinquency rates, late charges, other ancillary revenue, costs to service, and other economic factors. The Corporation periodically reviews and assesses the underlying inputs and assumptions used in the model. In addition, the Corporation compares its fair value estimates and assumptions to observable market data for mortgage servicing rights, where available, and to recent market activity and actual portfolio experience. Due to the nature of the valuation inputs, mortgage servicing rights are classified within Level 3 of the fair value hierarchy. The Corporation uses the amortization method (i.e., lower of amortized cost or estimated fair value measured on a nonrecurring basis), not fair value measurement accounting, for its mortgage servicing rights assets. See Note 8 for additional disclosure regarding the Corporation’s mortgage servicing rights.

The table below presents the Corporation’s investment securities available for sale and derivative financial instruments measured at fair value on a recurring basis as of March 31, 2016 and December 31, 2015, aggregated by the level in the fair value hierarchy within which those measurements fall.

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Assets and Liabilities Measured at Fair Value on a Recurring Basis

	Fair Value Hierarchy	March 31, 2016		December 31, 2015
		($ in Thousands)
Assets:
Investment securities available for sale:
U.S. Treasury securities	Level 1	$	1,000	$	997
Residential mortgage-related securities:
FNMA / FHLMC	Level 2	1,303,404		1,414,626
GNMA	Level 2	1,547,255		1,590,003
Private-label	Level 2	1,512		1,709
GNMA commercial mortgage-related securities	Level 2	2,047,865		1,955,310
Other securities (debt and equity)	Level 1	1,605		1,569
Other securities (debt and equity)	Level 2	3,000		3,000
Other securities (debt and equity)	Level 3	200		200
Total investment securities available for sale	Level 1	2,605		2,566
Total investment securities available for sale	Level 2	4,903,036		4,964,648
Total investment securities available for sale	Level 3	200		200
Interest rate-related instruments	Level 2	47,780		29,391
Foreign currency exchange forwards	Level 2	4,203		1,532
Interest rate lock commitments to originate residential mortgage loans held for sale	Level 3	2,689		958
Forward commitments to sell residential mortgage loans	Level 3	—		403
Commodity contracts	Level 2	1,104		1,269
Purchased options (time deposit)	Level 2	2,228		2,715
Liabilities:
Interest rate-related instruments	Level 2	50,145		30,886
Foreign currency exchange forwards	Level 2	4,097		1,398
Forward commitments to sell residential mortgage loans	Level 3	1,732		—
Commodity contracts	Level 2	981		1,146
Written options (time deposit)	Level 2	2,228		2,715

The table below presents a rollforward of the balance sheet amounts for the three months ended March 31, 2016 and the year ended December 31, 2015, for financial instruments measured on a recurring basis and classified within Level 3 of the fair value hierarchy.

	Investment Securities Available for Sale		Derivative Financial Instruments
	($ in Thousands)
Balance December 31, 2014	$	200	$	(488	)
Total net gains included in income:
Mortgage derivative gain	—		1,849
Balance December 31, 2015	$	200	$	1,361
Total net losses included in income:
Mortgage derivative loss	—		(404		)
Balance March 31, 2016	$	200	$	957

For Level 3 assets and liabilities measured at fair value on a recurring or nonrecurring basis as of March 31, 2016, the Corporation utilized the following valuation techniques and significant unobservable inputs.

Derivative financial instruments (mortgage derivative — interest rate lock commitments to originate residential mortgage loans held for sale):  The significant unobservable input used in the fair value measurement of the Corporation’s mortgage derivative interest rate lock commitments is the closing ratio, which represents the percentage of loans currently in a lock position which management estimates will ultimately close. The closing ratio calculation takes into consideration historical data and loan-level data, particularly the change in the current interest rates from the time of initial rate lock. The closing ratio is periodically reviewed

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for reasonableness and reported to the Associated Mortgage Group Risk Committee. At March 31, 2016, the closing ratio was 89%.

Impaired loans:  For individually evaluated impaired loans, the amount of impairment is based upon the present value of expected future cash flows discounted at the loan’s effective interest rate, the estimated fair value of the underlying collateral for collateral-dependent loans, or the estimated liquidity of the note, resulting in an average discount of 10% to 15%.

Mortgage servicing rights:  The discounted cash flow analyses that generate expected market prices utilize the observable characteristics of the mortgage servicing rights portfolio, as well as certain unobservable valuation parameters. The significant unobservable inputs used in the fair value measurement of the Corporation’s mortgage servicing rights are the weighted average constant prepayment rate and weighted average discount rate, which were 15.2% and 9.6% at March 31, 2016, respectively. Significant increases (decreases) in any of those inputs in isolation could result in a significantly lower (higher) fair value measurement.

These parameter assumptions fall within a range that the Corporation, in consultation with an independent third party, believes purchasers of servicing would apply to such portfolios sold into the current secondary servicing market. Discussions are held with members from Treasury and Consumer Banking to reconcile the fair value estimates and the key assumptions used by the respective parties in arriving at those estimates. The Associated Mortgage Group Risk Committee is responsible for providing control over the valuation methodology and key assumptions. To assess the reasonableness of the fair value measurement, the Corporation also compares the fair value and constant prepayment rate to a value calculated by an independent third party on an annual basis.

The table below presents the Corporation’s loans held for sale, impaired loans, and mortgage servicing rights measured at fair value on a nonrecurring basis as of March 31, 2016 and December 31, 2015, aggregated by the level in the fair value hierarchy within which those measurements fall.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

				Income Statement Category of Adjustment Recognized in Income	Adjustment Recognized in Income
($ in Thousands)	Fair Value Hierarchy	Fair Value
March 31, 2016
Assets:
Loans held for sale (2)	Level 2	$	129,398	Mortgage banking, net	$	—
Impaired loans (1)	Level 3	84,664		Provision for credit losses	(15,097		)
Mortgage servicing rights	Level 3	61,410		Mortgage banking, net	(909		)
December 31, 2015
Assets:
Loans held for sale	Level 2	$	124,915	Mortgage banking, net	$	(155	)
Impaired loans (1)	Level 3	41,891		Provision for credit losses	(7,796		)
Mortgage servicing rights	Level 3	70,686		Mortgage banking, net	425

(1) Represents individually evaluated impaired loans, net of the related allowance for loan losses.

(2) Loans held for sale are carried at the lower of cost or estimated fair value. At March 31, 2016, the estimated fair value exceeded the cost and therefore there was no adjustment recognized in Income.

Certain nonfinancial assets measured at fair value on a nonrecurring basis include other real estate owned (upon initial recognition or subsequent impairment), nonfinancial assets and nonfinancial liabilities measured at fair value in the second step of a goodwill impairment test, and intangible assets and other nonfinancial long-lived assets measured at fair value for impairment assessment.

During the first three months of 2016 and the full year 2015, certain other real estate owned, upon initial recognition, was re-measured and reported at fair value through a charge off to the allowance for loan losses based upon the estimated fair value of the other real estate owned, less estimated selling costs. The fair value of other real estate owned, upon initial recognition or subsequent impairment, was estimated using appraised values, which the Corporation classifies as a Level 2 nonrecurring fair value measurement. Other real estate owned measured at fair value upon initial recognition totaled approximately $3 million for the first three months of 2016 and $11 million for the year ended December 31, 2015, respectively. In addition to other real estate owned measured at fair value upon initial recognition, the Corporation also recorded write-downs to the balance of other real estate owned for subsequent impairment of less than $1 million and $3 million to foreclosure / OREO expense, net for the three months ended 2016 and the year ended December 31, 2015, respectively.

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Fair Value of Financial Instruments:

The Corporation is required to disclose estimated fair values for its financial instruments. Fair value estimates, methods, and assumptions are set forth below for the Corporation’s financial instruments.

The estimated fair values of the Corporation’s financial instruments were as follows.

		March 31, 2016				December 31, 2015
	Fair Value Hierarchy Level	Carrying Amount		Fair Value		Carrying Amount		Fair Value
		($ in Thousands)
Financial assets:
Cash and due from banks	Level 1	$	287,183	$	287,183	$	374,921	$	374,921
Interest-bearing deposits in other financial institutions	Level 1	68,025		68,025		79,764		79,764
Federal funds sold and securities purchased under agreements to resell	Level 1	20,200		20,200		19,000		19,000
Investment securities held to maturity	Level 2	1,176,821		1,204,345		1,168,230		1,184,442
Investment securities available for sale	Level 1	2,605		2,605		2,566		2,566
Investment securities available for sale	Level 2	4,903,036		4,903,036		4,964,648		4,964,648
Investment securities available for sale	Level 3	200		200		200		200
FHLB and Federal Reserve Bank stocks	Level 2	181,853		181,853		147,240		147,240
Loans held for sale	Level 2	128,339		129,398		124,915		124,915
Loans, net	Level 3	18,949,870		19,025,680		18,440,079		18,389,832
Bank owned life insurance	Level 2	580,583		580,583		583,019		583,019
Derivatives (trading and other assets)	Level 2	55,315		55,315		34,907		34,907
Derivatives (trading and other assets)	Level 3	2,689		2,689		1,361		1,361
Financial liabilities:
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	Level 3	$	19,117,418	$	19,117,418	$	19,444,863	$	19,444,863
Brokered CDs and other time deposits	Level 2	1,568,042		1,576,714		1,562,802		1,564,464
Short-term funding	Level 2	1,417,408		1,417,408		834,416		834,416
Long-term funding	Level 2	2,861,316		2,925,447		2,676,164		2,728,112
Standby letters of credit (1)	Level 2	2,746		2,746		2,954		2,954
Derivatives (trading and other liabilities)	Level 2	57,451		57,451		36,145		36,145
Derivatives (trading and other liabilities)	Level 3	1,732		1,732		—		—

(1) The commitment on standby letters of credit was $279 million and $297 million at March 31, 2016 and December 31, 2015, respectively. See Note 12 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.

Cash and due from banks, interest-bearing deposits in other financial institutions, and federal funds sold and securities purchased under agreements to resell—For these short-term instruments, the carrying amount is a reasonable estimate of fair value.

Investment securities (held to maturity and available for sale)—The fair value of investment securities is based on quoted prices in active markets, or if quoted prices are not available for a specific security, then fair values are estimated by using pricing models, quoted prices of securities with similar characteristics, or discounted cash flows.

FHLB and Federal Reserve Bank stocks—The carrying amount is a reasonable fair value estimate for the Federal Reserve Bank and Federal Home Loan Bank stocks given their “restricted” nature (i.e., the stock can only be sold back to the respective institutions (Federal Home Loan Bank or Federal Reserve Bank) or another member institution at par).

Loans held for sale—The fair value estimation process for the loans held for sale portfolio is segregated by loan type. The estimated fair value was based on what secondary markets are currently offering for portfolios with similar characteristics.

Loans, net—The fair value estimation process for the loan portfolio uses an exit price concept and reflects discounts the Corporation believes are consistent with liquidity discounts in the market place. Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as commercial and industrial, real estate construction, commercial real estate (owner occupied and investor), residential mortgage, home equity, and other consumer. The fair value of loans is estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with

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similar credit ratings and for similar maturities. The fair value analysis also included other assumptions to estimate fair value, intended to approximate those a market participant would use in an orderly transaction, with adjustments for discount rates, interest rates, liquidity, and credit spreads, as appropriate.

Bank owned life insurance—The fair value of bank owned life insurance approximates the carrying amount, because upon liquidation of these investments, the Corporation would receive the cash surrender value which equals the carrying amount.

Deposits—The fair value of deposits with no stated maturity such as noninterest-bearing demand, savings, interest-bearing demand, and money market accounts, is equal to the amount payable on demand as of the balance sheet date. The fair value of Brokered CDs and other time deposits is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently offered for deposits of similar remaining maturities. However, if the estimated fair value of Brokered CDs and other time deposits is less than the carrying value, the carrying value is reported as the fair value.

Short-term funding—The carrying amount is a reasonable estimate of fair value for existing short-term funding.

Long-term funding—Rates currently available to the Corporation for debt with similar terms and remaining maturities are used to estimate the fair value of existing long-term funding.

Standby letters of credit—The fair value of standby letters of credit represents deferred fees arising from the related off-balance sheet financial instruments. These deferred fees approximate the fair value of these instruments and are based on several factors, including the remaining terms of the agreement and the credit standing of the customer.

Derivatives (trading and other)

Interest rate-related instruments—The fair value of interest rate-related instruments is determined using discounted cash flow analysis on the expected cash flows of each derivative. The Corporation also incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements.

Foreign currency exchange forwards—The fair value of the Corporation’s foreign currency exchange forwards is determined using quoted prices of foreign currency exchange forwards with similar characteristics, with consideration given to the nature of the quote and the relationship of recently evidenced market activity to the fair value estimate.

Purchased and written options—The fair value of the Corporation’s purchased and written options is determined using quoted prices of the underlying stocks.

Commodity contracts—The fair value of the Corporation’s commodity contracts is determined using quoted prices of the underlying instruments.

Interest rate lock commitments to originate residential mortgage loans held for sale—The Corporation relies on an internal valuation model to estimate the fair value of its interest rate lock commitments to originate residential mortgage loans held for sale, which includes grouping the interest rate lock commitments by interest rate and terms, applying an estimated pull-through rate based on historical experience, and then multiplying by quoted investor prices determined to be reasonably applicable to the loan commitment groups based on interest rate, terms, and rate lock expiration dates of the loan commitment groups.

Forward commitments to sell residential mortgage loans—The Corporation relies on an internal valuation model to estimate the fair value of its forward commitments to sell residential mortgage loans (i.e., an estimate of what the Corporation would receive or pay to terminate the forward delivery contract based on market prices for similar financial instruments), which includes matching specific terms and maturities of the forward commitments against applicable investor pricing available.

Limitations—Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Corporation’s entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Corporation’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and, therefore, cannot be determined with precision. Changes in assumptions could significantly affect the estimates.

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Note 14Retirement Plans

The Corporation has a noncontributory defined benefit retirement plan (the Retirement Account Plan (“RAP”)) covering substantially all full-time employees. The benefits are based primarily on years of service and the employee’s compensation paid. Employees of acquired entities generally participate in the RAP after consummation of the business combinations. Any retirement plans of acquired entities are typically merged into the RAP after completion of the mergers, and credit is usually given to employees for years of service at the acquired institution for vesting and eligibility purposes.

The Corporation also provides healthcare access for eligible retired employees in its Postretirement Plan (the “Postretirement Plan”). Retirees who are at least 55 years of age with 5 years of service are eligible to participate in the Postretirement Plan. The Corporation has no plan assets attributable to the Postretirement Plan. The Corporation reserves the right to terminate or make changes to the Postretirement Plan at any time.

The components of net periodic benefit cost for the RAP and Postretirement Plans for three months ended March 31, 2016 and 2015 were as follows.

	Three Months Ended March 31,
	2016			2015
	($ in Thousands)
Components of Net Periodic Benefit Cost
Pension Plan:
Service cost	$	1,725		$	3,063
Interest cost	1,780			1,642
Expected return on plan assets	(5,065		)	(5,350		)
Amortization of prior service cost	13			13
Amortization of actuarial loss	482			532
Total net pension cost	$	(1,065	)	$	(100	)
Postretirement Plan:
Interest cost	$	36		$	35
Total net periodic benefit cost	$	36		$	35

Note 15Segment Reporting

The Corporation utilizes a risk-based internal profitability measurement system to provide strategic business unit reporting. The profitability measurement system is based on internal management methodologies designed to produce consistent results and reflect the underlying economics of the units. Certain strategic business units have been combined for segment information reporting purposes where the nature of the products and services, the type of customer and the distribution of those products and services are similar. The three reportable segments are Corporate and Commercial Specialty; Community, Consumer, and Business; and Risk Management and Shared Services. The financial information of the Corporation’s segments has been compiled utilizing the accounting policies described in the Corporation’s 2015 Annual Report on Form 10-K, with certain exceptions. The more significant of these exceptions are described herein.

The Corporation allocates net interest income using an internal funds transfer pricing ("FTP") methodology that charges users of funds (assets) and credits providers of funds (liabilities, primarily deposits) based on the maturity, prepayment and / or repricing characteristics of the assets and liabilities. The net effect of this allocation is recorded in the Risk Management and Shared Services segment.

During 2015, the Corporation adopted enhanced FTP methodology utilizing, new, more granular deposit information which incorporated the additional dimension of vintage (based on time from when the deposit account was opened) for determining the funds credit for non-maturity deposits. The new deposit information demonstrated that deposit accounts with the Corporation for a longer period of time had a lower attrition rate, warranting a higher crediting rate (based on a longer-term segment of the yield curve) to reflect the long-term value such deposits provide to the Corporation.

A credit provision is allocated to segments based on the expected long-term annual net charge off rates attributable to the credit risk of loans managed by the segment during the period. In contrast, the level of the consolidated provision for credit losses is determined based on an incurred loss model using the methodologies described in the Corporation’s 2015 Annual Report on Form 10-K to assess the overall appropriateness of the allowance for loan losses. The net effect of the credit provision is recorded in Risk Management and Shared Services. Indirect expenses incurred by certain centralized support areas are allocated to segments based on actual usage (for example, volume measurements) and other criteria. Certain types of administrative expense and bank-

39

wide expense accruals (including amortization of core deposit and other intangible assets associated with acquisitions) are generally not allocated to segments. Income taxes are allocated to segments based on the Corporation’s estimated effective tax rate, with certain segments adjusted for any tax-exempt income or non-deductible expenses. Equity is allocated to the segments based on regulatory capital requirements and in proportion to an assessment of the inherent risks associated with the business of the segment (including interest, credit and operating risk).

The management accounting policies and processes utilized in compiling segment financial information are highly subjective and, unlike financial accounting, are not based on authoritative guidance similar to U.S. generally accepted accounting principles. As a result, reported segments and the financial information of the reported segments are not necessarily comparable with similar information reported by other financial institutions. Furthermore, changes in management structure or allocation methodologies and procedures may result in changes in previously reported segment financial data.

A brief description of each business segment is presented below. A more in-depth discussion of these segments can be found in the Segment Reporting footnote in the Corporation’s 2015 Annual Report on Form 10-K. There have been no changes in the Corporation's segments since December 31, 2015.

The Corporate and Commercial Specialty segment serves a wide range of customers including larger businesses, developers, not-for-profits, municipalities, and financial institutions. The Community, Consumer, and Business segment serves individuals, as well as small and mid-sized businesses. The Risk Management and Shared Services segment includes key shared operational functions and also includes residual revenue and expenses, representing the difference between actual amounts incurred and the amounts allocated to operating segments, including interest rate risk residuals (FTP mismatches) and credit risk and provision residuals (long-term credit charge mismatches).

Information about the Corporation’s segments is presented below.

Segment Income Statement Data
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business			Risk Management and Shared Services			Consolidated Total
Three Months Ended March 31, 2016
Net interest income	$	79,164		$	85,605		$	7,218		$	171,987
Noninterest income	11,613			63,748			7,831			83,192
Total revenue	90,777			149,353			15,049			255,179
Credit provision*	12,739			6,142			1,119			20,000
Noninterest expense	34,403			121,295			18,273			173,971
Income (loss) before income taxes	43,635			21,916			(4,343		)	61,208
Income tax expense (benefit)	14,579			7,670			(3,575		)	18,674
Net income (loss)	$	29,056		$	14,246		$	(768	)	$	42,534
Return on average allocated capital (ROCET1)**	11.3		%	9.1		%	(5.0		)%	8.6		%
Three Months Ended March 31, 2015
Net interest income	$	75,691		$	86,357		$	5,765		$	167,813
Noninterest income	12,613			65,344			1,856			79,813
Total revenue	88,304			151,701			7,621			247,626
Credit provision*	9,526			7,071			(12,097		)	4,500
Noninterest expense	34,460			118,373			21,159			173,992
Income (loss) before income taxes	44,318			26,257			(1,441		)	69,134
Income tax expense (benefit)	15,368			9,190			(2,096		)	22,462
Net income	$	28,950		$	17,067		$	655		$	46,672
Return on average allocated capital (ROCET1)**	12.5		%	10.7		%	(1.1		)%	10.2		%

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Segment Balance Sheet Data
($ in Thousands)	Corporate and Commercial Specialty		Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Three Months Ended March 31, 2016
Average earning assets	$	9,720,028	$	9,120,319	$	6,432,026	$	25,272,373
Average loans	9,711,221		9,119,020		92,589		18,922,830
Average deposits	5,918,341		11,100,195		3,556,638		20,575,174
Average allocated capital (CET1)**	$	1,031,659	$	627,211	$	237,611	$	1,896,481
Three Months Ended March 31, 2015
Average earning assets	$	9,218,844	$	8,525,399	$	6,403,783	$	24,148,026
Average loans	9,210,992		8,525,399		78,724		17,815,115
Average deposits	5,421,541		10,522,618		3,111,037		19,055,196
Average allocated capital (CET1)**	$	942,764	$	647,375	$	214,078	$	1,804,217
* The consolidated credit provision is equal to the actual reported provision for credit losses.
** The Federal Reserve establishes capital adequacy requirements for the Corporation, including Tier 1 capital. Tier 1 capital is comprised of common capital and certain redeemable, non-cumulative preferred stock. Average allocated capital represents average common equity Tier 1 which is defined as average Tier 1 capital excluding qualifying perpetual preferred stock and qualifying trust preferred securities. This is a non-GAAP financial measure. For segment reporting purposes, the ROCET1 reflects return on average allocated common equity Tier 1 (“CET1”). The ROCET1 for the Risk Management and Shared Services segment and the Consolidated Total is inclusive of the annualized effect of the preferred stock dividends.

Note 16Accumulated Other Comprehensive Income (Loss)

The following table summarizes the components of accumulated other comprehensive income (loss) at March 31, 2016 and 2015, changes during the three month periods then ended, and reclassifications out of accumulated other comprehensive income (loss) during the three month periods ended March 31, 2016 and 2015, respectively.

($ in Thousands)	Investments Securities Available For Sale			Defined Benefit Pension and Post Retirement Obligations			Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2016	$	459		$	(33,075	)	$	(32,616	)
Other comprehensive income before reclassifications	60,422			—			60,422
Amounts reclassified from accumulated other comprehensive income (loss):
Investment securities gain, net	(3,098		)	—			(3,098		)
Personnel expense	—			495			495
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(1,572		)	—			(1,572		)
Income tax expense	(21,275		)	(189		)	(21,464		)
Net other comprehensive income during period	34,477			306			34,783
Balance March 31, 2016	$	34,936		$	(32,769	)	$	2,167
Balance January 1, 2015	$	18,512		$	(23,362	)	$	(4,850	)
Other comprehensive income before reclassifications	47,418			—			47,418
Amounts reclassified from accumulated other comprehensive income:
Personnel expense	—			545			545
Income tax expense	(18,105		)	(208		)	(18,313		)
Net other comprehensive income during period	29,313			337			29,650
Balance March 31, 2015	$	47,825		$	(23,025	)	$	24,800

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ITEM 2. Management's Discussion and Analysis of Financial Condition and Results of Operations

Special Note Regarding Forward-Looking Statements

This report contains statements that may constitute forward-looking statements within the meaning of the safe-harbor provisions for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995, such as statements other than historical facts contained or incorporated by reference into this report. These forward-looking statements include statements with respect to the Corporation’s financial condition, results of operations, plans, objectives, future performance and business, including statements preceded by, followed by or that include the words “believes,” “expects,” or “anticipates,” references to estimates or similar expressions. Future filings by the Corporation with the Securities and Exchange Commission, and future statements other than historical facts contained in written material, press releases and oral statements issued by, or on behalf of the Corporation may also constitute forward-looking statements.

All forward-looking statements contained in this report or which may be contained in future statements made for or on behalf of the Corporation are based upon information available at the time the statement is made and the Corporation assumes no obligation to update any forward-looking statements, except as required by federal securities law. Forward-looking statements are subject to significant risks and uncertainties, and the Corporation’s actual results may differ materially from the expected results discussed in such forward-looking statements. Factors that might cause actual results to differ from the results discussed in forward-looking statements include, but are not limited to, the risk factors in Item 1A, Risk Factors, in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2015, and as may be described from time to time in the Corporation’s subsequent SEC filings.

Overview

The following discussion and analysis is presented to assist in the understanding and evaluation of the Corporation’s financial condition and results of operations. It is intended to complement the unaudited consolidated financial statements, footnotes, and supplemental financial data appearing elsewhere in this Form 10-Q and should be read in conjunction therewith. Management continually evaluates strategic acquisition opportunities and other various strategic alternatives that could involve the sale or acquisition of branches or other assets, or the consolidation or creation of subsidiaries.

During the first quarter of 2016, the consolidated statements of income were modified from prior periods' presentation to conform with the current period presentation, which reflects OREO gains / losses as a component of Foreclosure / OREO expense, net. In prior periods' presentation, OREO gains / losses were reported as a component of asset gains (losses), net. All prior periods have been restated to reflect this change.

During the first quarter of 2016, the Corporation combined the lease financing portfolio with the commercial and industrial portfolio for disclosure purposes. All prior periods have been restated to reflect this change in presentation.

42

Performance Summary

• Average loans of $18.9 billion grew $380 million, or 2% from the fourth quarter, commercial lending accounted for 85% of average loan growth. Average deposits of $20.6 billion declined slightly from the fourth quarter. For the remainder of 2016, the Corporation expects high single digit annual average loan growth and to maintain the loan to deposit ratio under 100%.

• Net interest income of $172 million was slightly higher than the prior quarter, and up $4 million, or 2% from the year ago quarter. Net interest margin was 2.81% compared to 2.82% in the fourth quarter. In the absence of Federal Reserve action to raise rates, the Corporation expects the net interest margin to dip into the 2.75% to 2.80% range.

• Provision for credit losses of $20 million was flat to the fourth quarter. For the remainder of 2016, the Corporation expects the provision for loan losses will change based on loan growth and changes in risk grade or other indicators of credit quality.

• Noninterest income of $83 million was flat from the prior quarter. The Corporation expects noninterest income to be approximately flat to the prior year, excluding net investment securities gains.

• Noninterest expense of $174 million declined $2 million, or 1% from the prior quarter. The Corporation expects noninterest expense to be approximately flat to the prior year.

TABLE 1: Summary Results of Operations: Trends

(In thousands, except per share data)

	1st Qtr 2016			4th Qtr 2015			3rd Qtr 2015			2nd Qtr 2015			1st Qtr 2015
Net income	$	42,534		$	42,791		$	49,438		$	49,400		$	46,672
Net income available to common equity	40,336			40,593			47,254			47,855			45,444
Earnings per common share - basic	0.27			0.27			0.31			0.32			0.30
Earnings per common share - diluted	0.27			0.27			0.31			0.31			0.30
Effective tax rate	30.51		%	26.82		%	30.36		%	30.61		%	32.49		%
Reconciliation of Non-GAAP Measure
Federal Reserve efficiency ratio (a)	69.01		%	70.49		%	68.85		%	70.23		%	70.26		%
Fully tax-equivalent adjustment	(1.37		)%	(1.52		)%	(1.38		)%	(1.35		)%	(1.41		)%
Other intangible amortization	(0.20		)%	(0.21		)%	(0.36		)%	(0.35		)%	(0.32		)%
Fully tax-equivalent efficiency ratio (b)	67.44		%	68.76		%	67.11		%	68.53		%	68.53		%

(a) The efficiency ratio as defined by the Federal Reserve guidance is noninterest expense (which includes the provision for unfunded commitments) divided by the sum of net interest income plus noninterest income, excluding investment securities gains / losses, net.

(b) The fully tax-equivalent efficiency ratio is noninterest expense (which includes the provision for unfunded commitments), excluding other intangible amortization, divided by the sum of fully tax-equivalent net interest income plus noninterest income, excluding investment securities gains / losses, net. Management believes the fully tax-equivalent efficiency ratio, which adjusts net interest income for the tax-favored status of certain loans and investment securities, to be the preferred industry measurement as it enhances the comparability of net interest income arising from taxable and tax-exempt sources.

43

INCOME STATEMENT ANALYSIS

Net Interest Income

TABLE 2: Net Interest Income Analysis

	Quarter ended
	March 31, 2016						December 31, 2015						March 31, 2015
	Average Balance		Interest Income / Expense		Average Yield / Rate		Average Balance		Interest Income / Expense		Average Yield / Rate		Average Balance		Interest Income / Expense		Average Yield / Rate
	($ in Thousands)
ASSETS
Earning assets:
Loans:(1)(2)(3)
Commercial and business lending	$	7,121,061	$	57,258	3.23	%	$	6,892,162	$	55,451	3.19	%	$	6,993,169	$	55,915	3.24	%
Commercial real estate lending	4,469,531		38,989		3.51	%	4,373,460		37,587		3.41	%	4,102,733		36,403		3.60	%
Total commercial	11,590,592		96,247		3.34	%	11,265,622		93,038		3.28	%	11,095,902		92,318		3.37	%
Residential mortgage	5,920,280		47,748		3.23	%	5,845,557		47,305		3.24	%	5,231,698		43,472		3.33	%
Retail	1,411,958		16,640		4.72	%	1,431,509		16,673		4.65	%	1,487,515		17,081		4.62	%
Total loans	18,922,830		160,635		3.41	%	18,542,688		157,016		3.37	%	17,815,115		152,871		3.46	%
Investment securities:
Taxable	5,034,072		25,516		2.03	%	5,205,033		26,395		2.03	%	4,804,411		25,092		2.09	%
Tax-exempt(1)	1,045,210		11,980		4.58	%	1,016,329		11,909		4.69	%	950,336		12,067		5.08	%
Other short-term investments	270,261		1,067		1.59	%	259,053		1,639		2.53	%	578,164		1,692		1.18	%
Investments and other	6,349,543		38,563		2.43	%	6,480,415		39,943		2.47	%	6,332,911		38,851		2.45	%
Total earning assets	25,272,373		$	199,198	3.16	%	25,023,103		$	196,959	3.14	%	24,148,026		$	191,722	3.20	%
Other assets, net(4)	2,426,475						2,434,297						2,454,664
Total assets	$	27,698,848					$	27,457,400					$	26,602,690
LIABILITIES AND STOCKHOLDERS’ EQUITY
Interest-bearing liabilities:
Interest-bearing deposits:
Savings	$	1,367,646	$	236	0.07	%	$	1,358,141	$	249	0.07	%	$	1,277,469	$	238	0.08	%
Interest-bearing demand	3,220,409		2,032		0.25	%	3,150,628		1,217		0.15	%	3,203,727		1,050		0.13	%
Money market	9,432,245		6,444		0.27	%	9,534,551		4,351		0.18	%	8,653,260		3,785		0.18	%
Time	1,558,278		3,054		0.79	%	1,604,864		3,027		0.75	%	1,594,183		2,546		0.65	%
Total interest-bearing deposits	15,578,578		11,766		0.30	%	15,648,184		8,844		0.22	%	14,728,639		7,619		0.21	%
Federal funds purchased and securities sold under agreements to repurchase	559,459		296		0.21	%	605,026		229		0.15	%	585,498		231		0.16	%
Other short-term funding	777,898		515		0.27	%	368,752		186		0.20	%	119,240		81		0.27	%
Total short-term funding	1,337,357		811		0.24	%	973,778		415		0.17	%	704,738		312		0.18	%
Long-term funding(4)	2,582,538		9,505		1.47	%	2,676,116		10,692		1.60	%	3,731,367		10,872		1.17	%
Total short and long-term funding	3,919,895		10,316		1.05	%	3,649,894		11,107		1.22	%	4,436,105		11,184		1.01	%
Total interest-bearing liabilities	19,498,473		$	22,082	0.45	%	19,298,078		$	19,951	0.41	%	19,164,744		$	18,803	0.40	%
Noninterest-bearing demand deposits	4,996,596						4,967,719						4,326,557
Other liabilities	233,029						250,957						266,660
Stockholders’ equity	2,970,750						2,940,646						2,844,729
Total liabilities and stockholders’ equity	$	27,698,848					$	27,457,400					$	26,602,690
Interest rate spread					2.71	%					2.73	%					2.80	%
Net free funds					0.10	%					0.09	%					0.09	%
Fully tax-equivalent net interest income and net interest margin			$	177,116	2.81	%			$	177,008	2.82	%			$	172,919	2.89	%
Fully tax-equivalent adjustment			5,129						5,540						5,106
Net interest income			$	171,987					$	171,468					$	167,813

(1) The yield on tax-exempt loans and securities is computed on a fully tax-equivalent basis using a tax rate of 35% for all periods presented and is net of the effects of certain disallowed interest deductions.

(2) Nonaccrual loans and loans held for sale have been included in the average balances.

(3) Interest income includes net loan fees.

(4) During the first quarter of 2016, the Corporation adopted a new accounting standard related to simplifying the presentation of debt issuance costs.  Under this new accounting standard, debt issuance costs are still capitalized; however, they are reflected on the balance sheet with the related debt issued rather than within other assets.  All prior periods have been restated to reflect this change in presentation.

44

Notable contributions to the change in net interest income were:

• Net interest income in the consolidated statements of income (which excludes the fully tax-equivalent adjustment) was $172 million for the first quarter of 2016 compared to $168 million for first quarter of 2015. See sections “Interest Rate Risk” and “Quantitative and Qualitative Disclosures about Market Risk,” for a discussion of interest rate risk and market risk.

• Fully tax-equivalent net interest income of $177 million for the first quarter of 2016 was $4 million higher than the first quarter of 2015. The increase in fully tax-equivalent net interest income was attributable to a favorable volume variance (as balance sheet changes in both volume and mix increased fully tax-equivalent net interest income by $11 million) and a $1 million day variance, partially offset by an unfavorable rate variance (as the impact of changes in the interest rate environment and product pricing decreased fully tax-equivalent net interest income by $8 million).

• Average earning assets of $25.3 billion for the first quarter of 2016 were $1.1 billion, or 5% higher than the first quarter of 2015. Average loans increased $1.1 billion, or 6%, primarily due to a $689 million increase in residential mortgage loans. Average securities and short-term investments were essentially flat.

• Average interest-bearing liabilities of $19.5 billion for the first quarter of 2016 were up $334 million, or 2% versus the first quarter of 2015. On average, interest-bearing deposits increased $850 million and noninterest-bearing demand deposits (a principal component of net free funds) increased by $670 million. On average, short and long-term funding decreased $516 million from first quarter of 2015, including a $1.1 billion decrease in long-term funding, partially offset by a $633 million increase in short-term funding. The Corporation redeemed $430 million of senior notes in February 2016.

• The net interest margin for the first quarter of 2016 was 2.81%, compared to 2.89% for the first quarter of 2015. The 8 basis points ("bp") decline in net interest margin was attributable to a 9 bp decrease in interest rate spread (the net of a 4 bp decrease in the yield on earning assets and a 5 bp increase in the cost of interest-bearing liabilities), partially offset by a 1 bp higher contribution from net free funds.

• For the first quarter of 2016, loan yields decreased 5 bp to 3.41%, due to competitive pricing pressures in this low interest rate environment. The yield on investment securities and other short-term investments decreased 2 bp to 2.43%, and was also impacted by the low interest rate environment and higher prepayment speeds of mortgage-related securities purchased at a premium.

• The average cost of interest-bearing deposits was 0.30% for the first quarter of 2016, 9 bp higher than the first quarter of 2015. The cost of short term funding was up 6 bp, while the cost of long-term funding increased 30 bp to 1.47% for the first quarter of 2016.

• At the end of the first quarter of 2016, the Federal funds rate was below 0.50% after a target rate increase in December 2015. If the Federal Reserve decides to increase rates later this year, the timing and magnitude of any such increases is uncertain and will likely depend on domestic and global economic conditions, among other factors.

Provision for Credit Losses

The provision for credit losses (which includes the provision for loan losses and the provision for unfunded commitments) for the three months ended March 31, 2016 was $20 million, compared to $5 million for the three months ended March 31, 2015. Net charge offs were $17 million (representing 0.36% of average loans) for the three months ended March 31, 2016, compared to $6 million (representing 0.13% of average loans) for the three months ended March 31, 2015. The ratio of the allowance for loan losses to total loans was 1.44% and 1.48% at March 31, 2016 and 2015, respectively.

The provision for credit losses is predominantly a function of the Corporation’s reserving methodology and judgments as to other qualitative and quantitative factors used to determine the appropriate level of the allowance for loan losses and the allowance for unfunded commitments, which focuses on changes in the size and character of the loan portfolio, changes in levels of impaired and other nonaccrual loans, historical losses and delinquencies in each portfolio category, the level of loans sold or transferred to held for sale, the risk inherent in specific loans, concentrations of loans to specific borrowers or industries, existing economic conditions, the fair value of underlying collateral, and other factors which could affect potential credit losses. See additional discussion under sections, “Loans,” “Credit Risk,” “Nonaccrual Loans, Potential Problem Loans, and Other Real Estate Owned,” and “Allowance for Credit Losses."

45

Noninterest Income

TABLE 3: Noninterest Income

																1Q16 Change vs
($ in Thousands)	1Q16			4Q15			3Q15			2Q15			1Q15			4Q15		1Q15
Trust service fees	$	11,447		$	11,965		$	12,273		$	12,515		$	12,087		(4	)%	(5	)%
Service charges on deposit accounts	16,273			16,577			17,385			15,703			15,806			(2	)%	3	%
Card-based and other nondeposit fees	11,991			12,694			12,618			13,597			12,416			(6	)%	(3	)%
Insurance commissions	21,382			17,997			17,561			20,077			19,728			19	%	8	%
Brokerage and annuity commissions	3,794			3,694			3,809			4,192			3,683			3	%	3	%
Subtotal ("fee-based revenue")	64,887			62,927			63,646			66,084			63,720			3	%	2	%
Mortgage banking income	7,987			10,851			9,557			12,201			10,830			(26	)%	(26	)%
Mortgage servicing rights expense	(3,783		)	(2,580		)	(2,914		)	(2,260		)	(3,422		)	47	%	11	%
Mortgage banking, net	4,204			8,271			6,643			9,941			7,408			(49	)%	(43	)%
Capital market fees, net	3,538			3,423			2,170			2,692			2,467			3	%	43	%
Bank owned life insurance income	4,770			2,092			2,448			2,381			2,875			128	%	66	%
Other	2,171			2,580			2,118			2,288			2,510			(16	)%	(14	)%
Subtotal (“fee income”)	14,683			16,366			13,379			17,302			15,260			(10	)%	(4	)%
Asset gains (losses), net	524			(391		)	244			1,854			833			(234	)%	(37	)%
Investment securities gains, net	3,098			4,095			2,796			1,242			—			(24	)%	N/M
Total noninterest income	$	83,192		$	82,997		$	80,065		$	86,482		$	79,813		—	%	4	%
Mortgage loans originated for sale during period	$	193,849		$	316,973		$	291,931		$	350,906		$	268,296		(39	)%	(28	)%
Trust assets under management, at market value	$	7,843,512		$	7,729,131		$	7,625,613		$	8,068,241		$	8,137,705		1	%	(4	)%
N/M = Not Meaningful

Notable contributions to the change in noninterest income were:

• Fee-based revenue was $65 million, an increase of $1 million (2%) compared to the first quarter of 2015. Insurance commissions were $21 million, an increase of $2 million (8%) compared to the first quarter of 2015. The increase was primarily attributable to increased property and casualty related commissions.

• Net mortgage banking income for the first quarter of 2016 was $4 million, down $3 million (43%) compared to the first quarter of 2015. Net mortgage banking consists of gross mortgage banking income less mortgage servicing rights expense. Gross mortgage banking income includes servicing fees, the gain or loss on sales of mortgage loans to the secondary market, changes to the mortgage repurchase reserve, and the fair value adjustments on the mortgage derivatives. Gross mortgage banking income decreased, primarily due to a $3 million unfavorable change in the fair value of mortgage derivatives.

• Net investment securities gains were $3 million for the first quarter of 2016, due to the ongoing restructuring of the Corporation's investment portfolio from FNMA and FHLMC mortgage-related securities into GNMA mortgage-related securities. See Note 6, "Investment Securities" of the notes to consolidated financial statements for additional information on the investment securities portfolio restructuring.

• Bank owned life insurance income ("BOLI") was $5 million, an increase of $2 million (66%) compared to the first quarter of 2015, primarily due to increased proceeds from BOLI policy redemptions during the first quarter of 2016.

46

Noninterest Expense

TABLE 4: Noninterest Expense

											1Q16 Change vs
($ in Thousands)	1Q16		4Q15		3Q15		2Q15		1Q15		4Q15		1Q15
Personnel expense	$	101,398	$	100,469	$	101,134	$	102,986	$	100,152	1	%	1	%
Occupancy	13,802		14,718		14,187		14,308		17,683		(6	)%	(22	)%
Equipment	5,446		5,695		6,003		5,739		5,772		(4	)%	(6	)%
Technology	14,264		13,953		14,748		16,354		15,558		2	%	(8	)%
Business development and advertising	8,211		7,652		5,964		6,829		5,327		7	%	54	%
Other intangible amortization	504		520		885		888		801		(3	)%	(37	)%
Loan expense	3,221		4,120		3,305		3,681		2,996		(22	)%	8	%
Legal and professional fees	5,025		3,963		4,207		4,344		4,538		27	%	11	%
Foreclosure / OREO expense	1,877		2,371		645		1,264		1,162		(21	)%	62	%
FDIC expense	7,750		7,500		6,000		6,000		6,500		3	%	19	%
Other	12,473		15,032		14,507		14,384		13,503		(17	)%	(8	)%
Total noninterest expense	$	173,971	$	175,993	$	171,585	$	176,777	$	173,992	(1	)%	—	%
Average full-time equivalent employees	4,374		4,378		4,421		4,465		4,422

Notable contributions to the change in noninterest expense were:

• Personnel expense (which includes salary-related expenses and fringe benefit expenses) was $101 million for the first quarter of 2016, up $1 million from the first quarter of 2015.

• Nonpersonnel noninterest expenses on a combined basis were $73 million, down $1 million (2%) compared to the first quarter of 2015. Occupancy expense was down $4 million from the first quarter of 2015, primarily attributable to a $3 million lease termination charge incurred in the first quarter of 2015. Business development and advertising was up $3 million from the first quarter of 2015 due to timing of marketing campaigns. FDIC expense was $1 million (19%) higher compared to the first quarter of 2015 reflecting growth in risk-weighted assets.

Income Taxes

The Corporation recognized income tax expense of $19 million for the three months ended March 31, 2016 compared to income tax expense of $22 million for three months ended 2015. The change in income tax expense was primarily due to the decrease in the level of pretax income between the years. The effective tax rate was 30.51% for the first three months of 2016, compared to an effective tax rate of 32.49% for the first three months of 2015.

Income tax expense recorded in the consolidated statements of income involves the interpretation and application of certain accounting pronouncements and federal and state tax laws and regulations, and is, therefore, considered a critical accounting policy. The Corporation is subject to examination by various taxing authorities. Examination by taxing authorities may impact the amount of tax expense and / or reserve for uncertain tax positions if their interpretations differ from those of management, based on their judgments about information available to them at the time of their examinations. See section “Critical Accounting Policies," in the Corporation’s 2015 Annual Report on Form 10-K for additional information on income taxes.

47

BALANCE SHEET ANALYSIS

• At March 31, 2016, total assets were $28.2 billion, up$467 million (2%) from December 31, 2015 and up $1.1 billion (4%) from March 31, 2015.

• Loans of $19.2 billion at March 31, 2016 were up$513 million (3%) from December 31, 2015 and were up $1.2 billion (7%) from March 31, 2015. See section "Loans" for additional information on loans.

• Investment securities were $6.1 billion at March 31, 2016, down slightly (1%) from year-end 2015 and up $286 million (5%) from March 31, 2015.

• Premises and equipment, net of $332 million increased $64 million (24%) from December 31, 2015 and increased $57 million (21%) from March 31, 2015, primarily due to the purchase of the Milwaukee Center.

• At March 31, 2016, total deposits of $20.7 billion were down$322 million (2%) from December 31, 2015 and were up $834 million (4%) from March 31, 2015. See section "Deposits and Customer Funding" for additional information on deposits.

• Short and long-term funding of $4.3 billion at March 31, 2016 increased $768 million (22%) since year-end 2015, primarily due to increases of $435 million and $615 million in short and long-term FHLB Advances, respectively. This was partially offset by the redemption of $430 million in senior notes.

Loans

TABLE 5: Period End Loan Composition

	March 31, 2016				December 31, 2015				September 30, 2015				June 30, 2015				March 31, 2015
	Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total
	($ in Thousands)
Commercial and industrial	$	6,511,648	34	%	$	6,190,683	33	%	$	6,128,080	33	%	$	6,255,092	34	%	$	6,189,916	34	%
Commercial real estate — owner occupied	917,285		5		918,212		5		966,689		5		978,183		5		1,003,885		6
Commercial and business lending	7,428,933		39		7,108,895		38		7,094,769		38		7,233,275		39		7,193,801		40
Commercial real estate — investor	3,276,733		17		3,234,266		17		3,183,352		17		3,126,440		17		3,086,980		17
Real estate construction	1,184,398		6		1,162,145		6		1,124,280		6		1,092,308		6		1,019,571		6
Commercial real estate lending	4,461,131		23		4,396,411		23		4,307,632		23		4,218,748		23		4,106,551		23
Total commercial	11,890,064		62		11,505,306		61		11,402,401		61		11,452,023		62		11,300,352		63
Residential mortgage	5,944,457		31		5,783,267		31		5,682,178		31		5,398,434		30		5,208,241		29
Home equity revolving lines of credit	867,860		4		883,759		5		883,573		5		880,628		5		879,827		5
Home equity loans junior liens	115,134		1		122,043		1		130,892		1		141,344		1		154,120		1
Home equity	982,994		5		1,005,802		6		1,014,465		6		1,021,972		6		1,033,947		6
Other consumer	409,725		2		419,968		2		425,729		2		430,823		2		436,492		2
Total consumer	7,337,176		38		7,209,037		39		7,122,372		39		6,851,229		38		6,678,680		37
Total loans	$	19,227,240	100	%	$	18,714,343	100	%	$	18,524,773	100	%	$	18,303,252	100	%	$	17,979,032	100	%
Commercial real estate - investor and Real estate construction loan detail:
Farmland	$	5,557	—	%	$	7,135	—	%	$	9,645	—	%	$	9,590	—	%	$	8,987	—	%
Multi-family	974,051		30		932,360		29		921,456		29		902,680		29		926,640		30
Non-owner occupied	2,297,125		70		2,294,771		71		2,252,251		71		2,214,170		71		2,151,353		70
Commercial real estate — investor	$	3,276,733	100	%	$	3,234,266	100	%	$	3,183,352	100	%	$	3,126,440	100	%	$	3,086,980	100	%
1-4 family construction	$	320,984	27	%	$	309,396	27	%	$	315,538	28	%	$	318,222	29	%	$	300,210	29	%
All other construction	863,414		73		852,749		73		808,742		72		774,086		71		719,361		71
Real estate construction	$	1,184,398	100	%	$	1,162,145	100	%	$	1,124,280	100	%	$	1,092,308	100	%	$	1,019,571	100	%

48

• Commercial and business loans were $7.4 billion and represented 39% of total loans at March 31, 2016, an increase of $320 million (5%) from December 31, 2015 and an increase of $235 million (3%) from March 31, 2015.

• Commercial real estate lending totaled $4.5 billion at March 31, 2016 and represented 23% of total loans, an increase of $65 million (1%) from December 31, 2015 and an increase of $355 million (9%) from March 31, 2015.

• Consumer loans were $7.3 billion and represented 38% of total loans at March 31, 2016, an increase of $128 million (2%) from December 31, 2015 and an increase of $658 million (10%) from March 31, 2015.

The Corporation has long-term guidelines relative to the proportion of Commercial and Business, Commercial Real Estate, and Consumer loans within the overall loan portfolio, with each targeted to represent 30-40% of the overall loan portfolio. The targeted long-term guidelines were unchanged during 2015 and the first three months of 2016. Furthermore, certain sub-asset classes within the respective portfolios were further defined and dollar limitations were placed on these sub-portfolios. These guidelines and limits are reviewed quarterly and approved annually by the Enterprise Risk Committee of the Corporation’s Board of Directors. These guidelines and limits are designed to create balance and diversification within the loan portfolios.

Credit Risk

An active credit risk management process is used for commercial loans to ensure that sound and consistent credit decisions are made. Credit risk is controlled by detailed underwriting procedures, comprehensive loan administration, and periodic review of borrowers’ outstanding loans and commitments. Borrower relationships are formally reviewed and graded on an ongoing basis for early identification of potential problems. Further analysis by customer, industry, and geographic location are performed to monitor trends, financial performance, and concentrations.

Factors that are important to managing overall credit quality are sound loan underwriting and administration, systematic monitoring of existing loans and commitments, effective loan review on an ongoing basis, early identification of potential problems, and appropriate allowance for loan losses, allowance for unfunded commitments, nonaccrual and charge off policies.

Commercial and business lending:

The commercial and business lending classification primarily includes commercial loans to large corporations, middle market companies and small businesses and lease financing. At March 31, 2016, the largest industry group within the commercial and business lending category was the manufacturing sector which represented 8% of total loans and 20% of the total commercial and business lending portfolio. The next largest industry groups within the commercial and business lending category included the power and utilities portfolio, which represented 4% of total loans and represented 12% of the total commercial and business lending portfolio, followed by the finance and insurance portfolio, which represented 4% of total loans and represented 11% of the total commercial and business lending portfolio and the oil and gas portfolio, which represented 4% of total loans and represented 10% of the total commercial and business lending portfolio at March 31, 2016. The remaining commercial and business lending portfolio is spread over a diverse range of industries, none of which exceed 4% of total loans. The credit risk related to commercial loans is largely influenced by general economic conditions and the resulting impact on a borrower’s operations or on the value of underlying collateral, if any. Currently, a higher risk segment of the commercial and business lending portfolio is loans to borrowers supporting oil and gas exploration and production, which are further discussed under “Oil and gas lending” below.

Oil and gas lending:

The Corporation provides reserve based loans to oil and gas exploration and production firms. The Corporation's oil and gas lending team is based in Houston and focuses on serving the funding needs of small and mid-sized companies in the upstream oil and gas business. The oil and gas loans are generally first lien, reserve-based, and borrowing base dependent lines of credit. A small portion of the portfolio is in a second lien position to which the Corporation also holds the first lien position. The portfolio is diversified across all major U.S. geographic basins. The portfolio is diverse by product line with approximately 65% in oil and 35% in gas at March 31, 2016. Borrowing base re-determinations for the portfolio are completed at least twice a year and are based on detailed engineering reports and discounted cash flow analysis.

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The following table summarizes information about the Corporation's oil and gas loan portfolio.

TABLE 6: Oil and Gas Loan Portfolio

	March 31, 2016			December 31, 2015			September 30, 2015			June 30, 2015			March 31, 2015
	($ in Millions)
Pass	$	402		$	522		$	587		$	658		$	706
Special mention	75			86			74			28			35
Potential problem	150			124			84			60			39
Nonaccrual	129			20			13			11			—
Total Oil and gas related loans	$	756		$	752		$	758		$	757		$	780
Oil and gas related allowance	$	49		$	42		$	29		$	26		$	27
Oil and gas related allowance ratio	6.5		%	5.6		%	3.8		%	3.4		%	3.5		%

The Corporation proactively risk grades and reserves accordingly against the oil and gas loan portfolio. Lower market pricing and increased market volatility has led to downward migration within the portfolio. At March 31, 2016, nonaccrual oil and gas related loans totaled approximately $129 million, representing 17% of the oil and gas loan portfolio, an increase of $109 million from December 31, 2015. Potential problem oil and gas related loans totaled approximately $150 million at March 31, 2016, compared to $124 million at December 31, 2015. The increase in nonaccrual and potential problem oil and gas related loans was primarily due to downgrades associated with the recent issuance of new regulatory guidance, as well as the negative outlook for a near term oil and gas price recovery. As a result, the allowance for loan losses on oil and gas related loans increased to $49 million.

Commercial real estate lending:

Commercial real estate lending primarily includes commercial-based loans to investors that are secured by commercial income properties or multi-family projects. Commercial real estate loans are typically intermediate to long-term financings. Credit risk is managed in a similar manner to commercial and business lending by employing sound underwriting guidelines, lending primarily to borrowers in local markets and businesses, periodically evaluating the underlying collateral, and formally reviewing the borrower’s financial soundness and relationship on an ongoing basis.

Real estate construction:

Real estate construction loans are primarily short-term or interim loans that provide financing for the acquisition or development of commercial income properties, multi-family projects or residential development, both single family and condominium. Real estate construction loans are made to developers and project managers who are generally well known to the Corporation and have prior successful project experience. The credit risk associated with real estate construction loans is generally confined to specific geographic areas but is also influenced by general economic conditions. The Corporation controls the credit risk on these types of loans by making loans in familiar markets to developers, reviewing the merits of individual projects, controlling loan structure, and monitoring project progress and construction advances.

The Corporation’s current lending standards for commercial real estate and real estate construction lending are determined by property type and specifically address many criteria, including: maximum loan amounts, maximum loan-to-value (“LTV”), requirements for pre-leasing and / or presales, minimum borrower equity, and maximum loan to cost. Currently, the maximum standard for LTV is 80%, with lower limits established for certain higher risk types, such as raw land which has a 50% LTV maximum. The Corporation’s LTV guidelines are in compliance with regulatory supervisory limits. In most cases, for real estate construction loans, the loan amounts include interest reserves, which are built into the loans and sized to fund loan payments through construction and lease up and / or sell out.

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TABLE 7: Commercial Loan Maturity Distribution and Interest Rate Sensitivity

	Maturity (1)
March 31, 2016	Within 1 Year (2)			1-5 Years			After 5 Years			Total			% of Total
	($ in Thousands)
Commercial and industrial	$	5,438,030		$	798,554		$	275,064		$	6,511,648		55	%
Commercial real estate — investor	1,592,649			1,575,716			108,368			3,276,733			27	%
Commercial real estate — owner occupied	283,411			504,698			129,176			917,285			8	%
Real estate construction	840,903			324,823			18,672			1,184,398			10	%
Total	$	8,154,993		$	3,203,791		$	531,280		$	11,890,064		100	%
Fixed rate	$	3,866,242		$	942,019		$	261,794		$	5,070,055		43	%
Floating or adjustable rate	4,288,751			2,261,772			269,486			6,820,009			57	%
Total	$	8,154,993		$	3,203,791		$	531,280		$	11,890,064		100	%
Percent by maturity distribution	69		%	27		%	4		%	100		%

(1) Based upon scheduled principal repayments.

(2) Demand loans, past due loans, and overdrafts are reported in the “Within 1 Year” category.

The total commercial loans that were floating or adjustable rate was $6.8 billion (57%) at March 31, 2016. Including the $3.9 billion of fixed rate loans due within one year, 90% of the commercial loan portfolio noted above matures, re-prices, or resets within one year. Of the fixed rate loans due within one year, 94% have an original maturity within one year.

Residential mortgage:

Residential mortgage loans are primarily first lien home mortgages with a maximum loan to collateral value without credit enhancement (e.g. private mortgage insurance) of 80%. At March 31, 2016, the residential mortgage portfolio was comprised of $1.6 billion of fixed-rate residential real estate mortgages and $4.3 billion of variable-rate residential real estate mortgages, compared to $1.6 billion of fixed-rate mortgages and $4.2 billion variable-rate mortgages at December 31, 2015. The residential mortgage portfolio is focused primarily in our three-state branch footprint, with approximately 90% of the outstanding loan balances in our branch footprint at March 31, 2016. As part of management’s historical practice of originating and servicing residential mortgage loans, generally the Corporation’s 30-year, agency conforming, fixed-rate residential real estate mortgage loans are sold in the secondary market with servicing rights retained. The majority of the on balance sheet residential mortgage portfolio consists of hybrid, adjustable rate mortgage loans with initial fixed rate terms of 3, 5, 7, or 10 years. The Corporation may retain certain fixed-rate residential real estate mortgages in its loan portfolio, including some jumbo mortgages and CRA-related mortgages.

The Corporation’s underwriting and risk-based pricing guidelines for residential mortgage loans include minimum borrower FICO and maximum LTV of the property securing the loan. Residential mortgage products generally are underwritten using FHLMC and FNMA secondary marketing guidelines.

Home equity:

Home equity consists of both home equity lines of credit and closed-end home equity loans, approximately 22% are first lien positions. Home equity loans and lines in a junior position at March 31, 2016 included approximately 44% for which the Corporation also owned or serviced the related first lien loan and approximately 56% where the Corporation did not service the related first lien loan.

The Corporation’s credit risk monitoring guidelines for home equity is based on an ongoing review of loan delinquency status, as well as a quarterly review of FICO score deterioration and property devaluation. The Corporation does not routinely obtain appraisals on performing loans to update LTV ratios after origination; however, the Corporation monitors the local housing markets by reviewing the various home price indices and incorporates the impact of the changing market conditions in its ongoing credit monitoring process. For junior lien home equity loans, the Corporation is unable to track the performance of the first lien loan if it does not own or service the first lien loan. However, the Corporation obtains a refreshed FICO score on a quarterly basis and monitors this as part of its assessment of the home equity portfolio.

The Corporation’s underwriting and risk-based pricing guidelines for home equity lines and loans consist of a combination of both borrower FICO and the original LTV of the property securing the loan. Currently, for home equity products, the maximum acceptable LTV is 90% for customers with FICO scores exceeding 700. Home equity loans generally have a 20 year term and are fixed rate with principal and interest payments required, while home equity lines are generally tied to floating rate indices.

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Based upon outstanding balances at March 31, 2016, the following table presents the periods when home equity lines of credit revolving periods are scheduled to end.

TABLE 8: Home Equity Line of Credit - Revolving Period End Dates

	$ in Thousands		% to Total
Less than 5 years	$	38,077	4	%
5 — 10 years	205,868		24	%
Over 10 years	623,915		72	%
Total home equity revolving lines of credit	$	867,860	100	%

Other consumer:

Other consumer consists of student loans, as well as short-term and other personal installment loans and credit cards. The Corporation had $239 million and $249 million of student loans at March 31, 2016, and December 31, 2015, respectively, the majority of which are government guaranteed. Credit risk for non-government guaranteed student, short-term and personal installment loans and credit cards is influenced by general economic conditions, the characteristics of individual borrowers, and the nature of the loan collateral. Risks of loss are generally on smaller average balances per loan spread over many borrowers. Once charged off, there is usually less opportunity for recovery of these smaller consumer loans. Credit risk is primarily controlled by reviewing the creditworthiness of the borrowers, monitoring payment histories, and taking appropriate collateral and guarantee positions. The student loan portfolio is in run-off and no new student loans are being originated.

The loan portfolio is widely diversified by types of borrowers, industry groups, and market areas within our branch footprint. Significant loan concentrations are considered to exist when there are amounts loaned to numerous borrowers engaged in similar activities that would cause them to be similarly impacted by economic or other conditions. At March 31, 2016, no significant concentrations existed in the Corporation’s portfolio in excess of 10% of total loans.

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Nonaccrual Loans, Potential Problem Loans, and Other Real Estate Owned

Management is committed to a proactive nonaccrual and problem loan identification philosophy. This philosophy is implemented through the ongoing monitoring and review of all pools of risk in the loan portfolio to ensure that problem loans are identified quickly and the risk of loss is minimized. Table 9 provides detailed information regarding nonperforming assets, which include nonaccrual loans and other real estate owned.

TABLE 9: Nonperforming Assets

	March 31, 2016			December 31, 2015			September 30, 2015			June 30, 2015			March 31, 2015
	($ in Thousands)
Nonperforming assets:
Commercial and industrial	$	197,115		$	93,575		$	60,184		$	66,394		$	63,340
Commercial real estate — owner occupied	9,443			8,049			13,368			18,821			21,861
Commercial and business lending	206,558			101,624			73,552			85,215			85,201
Commercial real estate — investor	12,330			8,643			6,921			6,090			13,742
Real estate construction	840			940			997			2,906			5,423
Commercial real estate lending	13,170			9,583			7,918			8,996			19,165
Total commercial	219,728			111,207			81,470			94,211			104,366
Residential mortgage	52,212			51,482			51,957			51,920			54,149
Home equity revolving lines of credit	8,822			9,917			8,060			8,420			9,171
Home equity loans junior liens	5,250			5,327			5,581			5,356			6,145
Home equity	14,072			15,244			13,641			13,776			15,316
Other consumer	383			325			386			454			515
Total consumer	66,667			67,051			65,984			66,150			69,980
Total nonaccrual loans	286,395			178,258			147,454			160,361			174,346
Commercial real estate owned	9,695			7,942			9,242			9,906			10,620
Residential real estate owned	4,689			4,768			3,788			2,996			3,474
Bank properties real estate owned	1,672			1,859			710			655			832
Other real estate owned (“OREO”)	16,056			14,569			13,740			13,557			14,926
Total nonperforming assets (“NPAs”)	$	302,451		$	192,827		$	161,194		$	173,918		$	189,272
Commercial real estate-investor & Real estate construction nonaccrual loans detail:
Multi-family	$	415		$	2		$	2		$	40		$	423
Non-owner occupied	11,915			8,641			6,919			6,050			13,319
Commercial real estate — investor	$	12,330		$	8,643		$	6,921		$	6,090		$	13,742
1-4 family construction	$	274		$	314		$	337		$	682		$	1,304
All other construction	566			626			660			2,224			4,119
Real estate construction	$	840		$	940		$	997		$	2,906		$	5,423
Accruing loans past due 90 days or more:
Commercial	$	217		$	249		$	178		$	262		$	197
Consumer	1,412			1,399			1,306			1,400			1,518
Total accruing loans past due 90 days or more	$	1,629		$	1,648		$	1,484		$	1,662		$	1,715
Restructured loans (accruing):
Commercial	$	57,980		$	59,595		$	55,006		$	60,219		$	59,738
Consumer	27,617			27,768			27,803			30,001			29,079
Total restructured loans (accruing)	$	85,597		$	87,363		$	82,809		$	90,220		$	88,817
Nonaccrual restructured loans (included in nonaccrual loans)	$	35,232		$	37,684		$	36,583		$	43,699		$	53,553
Ratios:
Nonaccrual loans to total loans	1.49		%	0.95		%	0.80		%	0.88		%	0.97		%
NPAs to total loans plus OREO	1.57		%	1.03		%	0.87		%	0.95		%	1.05		%
NPAs to total assets	1.07		%	0.70		%	0.59		%	0.64		%	0.70		%
Allowance for loan losses to nonaccrual loans	97		%	154		%	178		%	163		%	152		%

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TABLE 9: Nonperforming Assets (continued)

	March 31, 2016		December 31, 2015		September 30, 2015		June 30, 2015		March 31, 2015
	($ in Thousands)
Accruing loans 30-89 days past due:
Commercial and industrial	$	2,901	$	1,011	$	3,296	$	6,357	$	1,717
Commercial real estate — owner occupied	520		7,142		2,018		1,090		1,849
Commercial and business lending	3,421		8,153		5,314		7,447		3,566
Commercial real estate — investor	1,072		291		1,218		19,843		2,215
Real estate construction	415		296		373		312		317
Commercial real estate lending	1,487		587		1,591		20,155		2,532
Total commercial	4,908		8,740		6,905		27,602		6,098
Residential mortgage	3,594		4,930		4,811		6,602		4,356
Home equity revolving lines of credit	3,582		5,559		6,142		5,157		7,150
Home equity loans junior liens	2,222		2,360		2,423		1,894		1,905
Home equity	5,804		7,919		8,565		7,051		9,055
Other consumer	1,682		1,870		1,723		1,655		1,818
Total consumer	11,080		14,719		15,099		15,308		15,229
Total accruing loans 30-89 days past due	$	15,988	$	23,459	$	22,004	$	42,910	$	21,327
Commercial real estate-investor & Real estate construction accruing loans 30-89 days past due detail:
Farmland	$	—	$	—	$	66	$	—	$	—
Multi-family	324		108		114		541		849
Non-owner occupied	748		183		1,038		19,302		1,366
Commercial real estate — investor	$	1,072	$	291	$	1,218	$	19,843	$	2,215
1-4 family construction	$	—	$	27	$	28	$	213	$	317
All other construction	415		269		345		99		—
Real estate construction	$	415	$	296	$	373	$	312	$	317
Potential problem loans:
Commercial and industrial	$	328,464	$	233,130	$	192,174	$	127,028	$	140,412
Commercial real estate — owner occupied	41,107		35,706		41,466		41,997		43,114
Commercial and business lending	369,571		268,836		233,640		169,025		183,526
Commercial real estate — investor	25,385		25,944		23,633		23,543		26,026
Real estate construction	2,422		3,919		2,354		1,327		1,487
Commercial real estate lending	27,807		29,863		25,987		24,870		27,513
Total commercial	397,378		298,699		259,627		193,895		211,039
Residential mortgage	3,488		2,796		3,966		5,341		6,621
Home equity revolving lines of credit	48		48		141		202		247
Home equity loans junior liens	161		174		86		230		711
Home equity	209		222		227		432		958
Total consumer	3,697		3,018		4,193		5,773		7,579
Total potential problem loans	$	401,075	$	301,717	$	263,820	$	199,668	$	218,618

Nonaccrual Loans: Nonaccrual loans are considered to be one indicator of potential future loan losses. See Note 7, “Loans,” of the notes to consolidated financial statements for additional nonaccrual loan disclosures. The ratio of nonaccrual loans to total loans at March 31, 2016 was 1.49%, as compared to 0.95% at December 31, 2015 and 0.97% at March 31, 2015. See also sections "Credit Risk" and "Allowance for Credit Losses".

Accruing Loans Past Due 90 Days or More: Loans past due 90 days or more but still accruing interest are classified as such where the underlying loans are both well secured (the collateral value is sufficient to cover principal and accrued interest) and are in the process of collection. Accruing loans 90 days or more past due at March 31, 2016 were relatively unchanged from both December 31, 2015 and March 31, 2015.

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Troubled Debt Restructurings (“Restructured Loans”): Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. See also Note 7, “Loans,” of the notes to consolidated financial statements for additional restructured loans disclosures.

Potential Problem Loans: The level of potential problem loans is another predominant factor in determining the relative level of risk in the loan portfolio and in determining the appropriate level of the allowance for loan losses. Potential problem loans are generally defined by management to include loans rated as substandard by management but that are not considered impaired (i.e., nonaccrual loans and accruing troubled debt restructurings); however, there are circumstances present to create doubt as to the ability of the borrower to comply with present repayment terms. The decision of management to include performing loans in potential problem loans does not necessarily mean that the Corporation expects losses to occur, but that management recognizes a higher degree of risk associated with these loans. The increase in potential problem loans is primarily due to the risk migration on certain general commercial and oil and gas credits.

Other Real Estate Owned: Other real estate owned increased to $16 million at March 31, 2016, compared to $15 million at both December 31, 2015 and March 31, 2015. Management actively seeks to ensure properties held are monitored to minimize the Corporation’s risk of loss.

Allowance for Credit Losses

Credit risks within the loan portfolio are inherently different for each loan type. Credit risk is controlled and monitored through the use of lending standards, a thorough review of potential borrowers, and ongoing review of loan payment performance. Active asset quality administration, including early problem loan identification and timely resolution of problems, aids in the management of credit risk and minimization of loan losses. Credit risk management for each loan type is discussed in the section entitled “Credit Risk.”

The allowance for credit losses is comprised of the allowance for loan losses and the allowance for unfunded commitments. The level of the allowance for loan losses represents management’s estimate of an amount appropriate to provide for probable credit losses in the loan portfolio at the balance sheet date. The allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb estimated probable losses related to unfunded credit facilities (including unfunded loan commitments and letters of credit) and is included in accrued expenses and other liabilities on the consolidated balance sheets.

To assess the appropriateness of the allowance for loan losses, an allocation methodology is applied by the Corporation which focuses on evaluation of many factors, including but not limited to: evaluation of facts and issues related to specific loans, management’s ongoing review and grading of the loan portfolio, consideration of historical loan loss and delinquency experience on each portfolio category, trends in past due and nonaccrual loans, the level of potential problem loans, the risk characteristics of the various classifications of loans, changes in the size and character of the loan portfolio, concentrations of loans to specific borrowers or industries, existing economic conditions, the fair value of underlying collateral, and other qualitative and quantitative factors which could affect potential credit losses. Assessing these factors involves significant judgment. Because each of the criteria used is subject to change, the allowance for loan losses is not necessarily indicative of the trend of future loan losses in any particular category. Therefore, management considers the allowance for loan losses a critical accounting policy — see section “Critical Accounting Policies.” See section, “Nonaccrual Loans, Potential Problem Loans, and Other Real Estate Owned,” for a detailed discussion on asset quality. See also Note 7, “Loans,” of the notes to consolidated financial statements for additional allowance for loan losses disclosures. Table 5 provides information on loan growth and period end loan composition, Table 9 provides additional information regarding nonperforming assets, and Tables 10 and 11 provide additional information regarding activity in the allowance for loan losses.

The methodology used for the allocation of the allowance for loan losses at March 31, 2016 and December 31, 2015 was generally comparable, whereby the Corporation segregated its loss factors (used for both criticized and non-criticized loans) into a component primarily based on historical loss rates and a component primarily based on other qualitative factors that are probable to affect loan collectability. The Corporation’s allowance for loan losses methodology considers an estimate of the historical loss emergence period (which is the period of time between the event that triggers a loss and the confirmation and / or charge off of that loss), probability of default, and loss given default for each loan portfolio segment. Management allocates the allowance for loan losses by pools of risk within each loan portfolio. The allocation methodology consists of the following components: First, a valuation allowance estimate is established for specifically identified commercial and consumer loans determined by the Corporation to be impaired, using discounted cash flows, estimated fair value of underlying collateral, and / or other data available. Second, management allocates the allowance for loan losses with loss factors, for criticized loan pools by loan type as well as for non-criticized loan pools by loan type, primarily based on historical loss rates after considering loan type, historical loss and delinquency experience, and industry statistics. Loans that have been criticized are considered to have a higher risk of default than non-criticized loans, as circumstances were present to support the lower loan grade, warranting higher loss factors. The loss factors applied in the methodology are periodically re-evaluated and adjusted to reflect changes in historical loss levels or other risks. Lastly, management allocates allowance for loan losses to absorb unrecognized losses that may not be provided for by the other components

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due to other factors evaluated by management, such as limitations within the credit risk grading process, known current economic or business conditions that may not yet show in trends, industry or other concentrations with current issues that impose higher inherent risks than are reflected in the loss factors, and other relevant considerations. The total allowance is available to absorb losses from any segment of the loan portfolio.

TABLE 10: Allowance for Credit Losses

	March 31, 2016			December 31, 2015			September 30, 2015			June 30, 2015			March 31, 2015
	($ in Thousands)
Allowance for Loan Losses:
Balance at beginning of period	$	274,264		$	262,536		$	261,538		$	265,268		$	266,302
Provision for loan losses	20,000			19,500			9,000			5,000			4,500
Charge offs	(21,245		)	(12,741		)	(11,732		)	(14,537		)	(13,270		)
Recoveries	4,351			4,969			3,730			5,807			7,736
Net charge offs	(16,894		)	(7,772		)	(8,002		)	(8,730		)	(5,534		)
Balance at end of period	$	277,370		$	274,264		$	262,536		$	261,538		$	265,268
Allowance for Unfunded Commitments:
Balance at beginning of period	$	24,400		$	23,900		$	24,900		$	24,900		$	24,900
Provision for unfunded commitments	—			500			(1,000		)	—			—
Balance at end of period	$	24,400		$	24,400		$	23,900		$	24,900		$	24,900
Allowance for credit losses(A)	$	301,770		$	298,664		$	286,436		$	286,438		$	290,168
Provision for credit losses(B)	$	20,000		$	20,000		$	8,000		$	5,000		$	4,500
Net loan (charge offs) recoveries:
Commercial and industrial	$	(14,936	)	$	(4,586	)	$	(4,709	)	$	(3,921	)	$	(4,650	)
Commercial real estate — owner occupied	(43		)	(291		)	504			(1,198		)	(739		)
Commercial and business lending	(14,979		)	(4,877		)	(4,205		)	(5,119		)	(5,389		)
Commercial real estate — investor	1,239			(665		)	(496		)	(1,856		)	2,529
Real estate construction	(28		)	140			(38		)	673			743
Commercial real estate lending	1,211			(525		)	(534		)	(1,183		)	3,272
Total commercial	(13,768		)	(5,402		)	(4,739		)	(6,302		)	(2,117		)
Residential mortgage	(1,232		)	(714		)	(1,562		)	(1,278		)	(1,005		)
Home equity revolving lines of credit	(902		)	(294		)	(533		)	(246		)	(1,220		)
Home equity loans junior liens	(244		)	(623		)	(358		)	(118		)	(423		)
Home equity	(1,146		)	(917		)	(891		)	(364		)	(1,643		)
Other consumer	(748		)	(739		)	(810		)	(786		)	(769		)
Total consumer	(3,126		)	(2,370		)	(3,263		)	(2,428		)	(3,417		)
Total net charge offs	$	(16,894	)	$	(7,772	)	$	(8,002	)	$	(8,730	)	$	(5,534	)
Commercial real estate-investor and Real estate construction net charge off detail:
Multi-family	$	(2	)	$	—		$	(35	)	$	—		$	(4	)
Non-owner occupied	1,241			(665		)	(461		)	(1,856		)	2,533
Commercial real estate — investor	$	1,239		$	(665	)	$	(496	)	$	(1,856	)	$	2,529
1-4 family construction	$	(49	)	$	235		$	31		$	280		$	204
All other construction	21			(95		)	(69		)	393			539
Real estate construction	$	(28	)	$	140		$	(38	)	$	673		$	743
Ratios:
Allowance for loan losses to total loans	1.44		%	1.47		%	1.42		%	1.43		%	1.48		%
Allowance for loan losses to net charge offs (Annualized)	4.1x			8.9x			8.3x			7.5x			11.8x

(A) Includes the allowance for loan losses and the allowance for unfunded commitments.

(B) Includes the provision for loan losses and the provision for unfunded commitments.

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TABLE 11: Annualized net (charge offs) recoveries(A)

(in basis points)	March 31, 2016		December 31, 2015		September 30, 2015		June 30, 2015		March 31, 2015
Net loan (charge offs) recoveries:
Commercial and industrial	(97	)	(31	)	(31	)	(25	)	(31	)
Commercial real estate — owner occupied	(2	)	(12	)	21		(48	)	(30	)
Commercial and business lending	(85	)	(28	)	(24	)	(29	)	(31	)
Commercial real estate — investor	15		(8	)	(6	)	(24	)	33
Real estate construction	(1	)	5		(1	)	26		30
Commercial real estate lending	11		(5	)	(5	)	(11	)	32
Total commercial	(48	)	(19	)	(17	)	(22	)	(8	)
Residential mortgage	(8	)	(5	)	(11	)	(9	)	(8	)
Home equity revolving lines of credit	(41	)	(13	)	(24	)	(11	)	(56	)
Home equity loans junior liens	(83	)	(195	)	(104	)	(32	)	(108	)
Home equity	(46	)	(36	)	(35	)	(14	)	(64	)
Other consumer	(72	)	(69	)	(75	)	(73	)	(70	)
Total consumer	(17	)	(13	)	(18	)	(14	)	(21	)
Total net charge offs	(36	)	(17	)	(17	)	(19	)	(13	)
Commercial real estate-investor and Real estate construction net charge off detail:
Multi-family	N/M		N/M		(2	)	N/M		N/M
Non-owner occupied	21		(11	)	(8	)	(34	)	48
Commercial real estate — investor	15		(8	)	(6	)	(24	)	33
1-4 family construction	(6	)	29		4		35		27
All other construction	1		(5	)	(3	)	22		32
Real estate construction	(1	)	5		(1	)	26		30

(A) Annualized ratio of net charge offs to average loans by loan type.

N/M = Not Meaningful

At March 31, 2016, the allowance for credit losses was $302 million, compared to $299 million at December 31, 2015 and $290 million at March 31, 2015. At March 31, 2016, the allowance for loan losses to total loans was 1.44% and covered 97% of nonaccrual loans, compared to 1.47% and 154%, respectively, at December 31, 2015 and 1.48% and 152%, respectively, at March 31, 2015. Management believes the level of allowance for loan losses to be appropriate at March 31, 2016, December 31, 2015, and March 31, 2015.

Key contributors to the increase in the allowance for credit losses and the related provision for credit losses during the first quarter of 2016 were:

• Total loans increased $513 million (3%) during the first quarter of 2016, including a $320 million (5%) increase in commercial and business lending, a $65 million (1%) increase in commercial real estate lending, and a $128 million (2%) increase in total consumer. Compared to March 31, 2015, total loans increased $1.2 billion (7%), including a $235 million (3%) increase in commercial and business lending, a $355 million (9%) increase in commercial real estate lending, and a $658 million (10%) increase in total consumer. See section “Loans” for additional information on the changes in the loan portfolio and see section “Credit Risk” for discussion about credit risk management for each loan type.

• Total nonaccrual loans increased $108 million during the first quarter of 2016, primarily due to the risk migration of oil and gas related credits. Nonaccrual loans increased $112 million from March 31, 2015, also principally related to the risk migration within the oil and gas loan portfolio. See also Note 7, “Loans,” of the notes to consolidated financial statements and section “Nonaccrual Loans, Potential Problem Loans, and Other Real Estate Owned” for additional disclosures on the changes in asset quality.

• Potential problem loans increased $99 million from December 31, 2015 and increased $182 million from March 31, 2015, primarily due to the risk migration on general commercial and oil and gas related credits. See Table 9 for additional information on the changes in potential problem loans.

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• Net charge offs increased $9 million from the fourth quarter of 2015 and increased $11 million from the first quarter of 2015, primarily due to the charge off of one large oil and gas related credit. See Tables 10 and 11 for additional information regarding the activity in the allowance for loan losses.

• The allowance for loan losses attributable to oil and gas related credits (included within the commercial and industrial allowance for loan losses) increased to $49 million at March 31, 2016, compared to $42 million at December 31, 2015 and $27 million at March 31, 2015. See also Oil and gas lending with the "Credit Risk" section for additional information.

Deposits and Customer Funding

TABLE 12: Period End Deposit and Customer Funding Composition

($ in Thousands)	March 31, 2016				December 31, 2015				September 30, 2015				June 30, 2015				March 31, 2015
	Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total
Noninterest-bearing demand	$	5,272,685	26	%	$	5,562,466	27	%	$	4,657,261	23	%	$	4,332,171	23	%	$	4,570,872	23	%
Savings	1,426,951		7		1,334,420		6		1,346,407		6		1,359,478		7		1,337,643		7
Interest-bearing demand	3,698,941		18		3,445,000		17		3,416,429		17		3,576,311		19		3,525,870		18
Money market	8,718,841		42		9,102,977		43		9,516,503		46		8,374,186		43		8,781,206		44
Brokered CDs	41,440		—		42,443		—		42,689		—		39,760		—		40,699		—
Other time	1,526,602		7		1,520,359		7		1,579,106		8		1,587,657		8		1,595,302		8
Total deposits	$	20,685,460	100	%	$	21,007,665	100	%	$	20,558,395	100	%	$	19,269,563	100	%	$	19,851,592	100	%
Customer funding	508,262				383,568				524,630				433,044				528,572
Total deposits and customer funding	$	21,193,722			$	21,391,233			$	21,083,025			$	19,702,607			$	20,380,164
Network transaction deposits (1)	$	3,399,054			$	3,174,911			$	3,207,867			$	2,920,939			$	2,900,325
Total deposits and customer funding, excluding Brokered CDs and network transaction deposits	$	17,753,228			$	18,173,879			$	17,832,469			$	16,741,908			$	17,439,140
Time deposits of $100,000 or more	$	480,469			$	465,950			$	511,070			$	470,092			$	510,977
Time deposits of more than $250,000	$	144,294			$	127,120			$	169,146			$	185,273			$	188,328
(1) Included above in interest-bearing demand and money market.

• Deposits are the Corporation’s largest source of funds.

• Total deposits decreased $322 million (2%) from December 31, 2015, and increased $834 million (4%) from March 31, 2015, primarily in noninterest-bearing demand deposits.

• Non-maturity deposit accounts, comprised of savings, money market, and demand (both interest and non-interest bearing demand) accounts accounted for 93% of our total deposits at March 31, 2016.

• Included in the above amounts were $3.4 billion of network deposits, primarily sourced from other financial institutions and intermediaries. These represented 16% of our total deposits at March 31, 2016.

Liquidity

The objective of liquidity risk management is to ensure that the Corporation has the ability to generate sufficient cash or cash equivalents in a timely and cost effective manner to satisfy the cash flow requirements of depositors and borrowers and to meet its other commitments as they become due. The Corporation’s liquidity risk management process is designed to identify, measure, and manage the Corporation’s funding and liquidity risk to meet its daily funding needs in the ordinary course of business, as well as to address expected and unexpected changes in its funding requirements. The Corporation engages in various activities to manage its liquidity risk, including diversifying its funding sources, stress testing, and holding readily-marketable assets which can be used as a source of liquidity, if needed.

The Corporation performs dynamic scenario analysis in accordance with industry best practices. Measures have been established to ensure the Corporation has sufficient high quality short-term liquidity to meet cash flow requirements under stressed scenarios. In addition the Corporation also reviews static measures such as deposit funding as a percent of total assets and liquid asset levels. Strong capital ratios, credit quality, and core earnings are also essential to maintaining cost effective access to wholesale funding

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markets. At March 31, 2016, the Corporation was in compliance with its internal liquidity objectives and has sufficient asset-based liquidity to meet its obligations under a stressed scenario.

The Corporation maintains diverse and readily available liquidity sources, including:

• Investment securities are an important tool to the Corporation’s liquidity objective, and can be pledged or sold to enhance liquidity, if necessary. See also Note 6, “Investment Securities,” of the notes to consolidated financial statements for additional information on the Corporation's investment securities portfolio, including investment securities pledged.

• The Bank pledges eligible loans to both the Federal Reserve Bank and the FHLB as collateral to establish lines of credit and borrow from these entities. Based on the amount of collateral pledged, the FHLB established a collateral value from which the Bank may draw advances against the collateral. Also, the collateral is used to enable the FHLB to issue letters of credit in favor of public fund depositors of the Bank. As of March 31, 2016, the Bank had $2.1 billion available for future advances. The Federal Reserve Bank also establishes a collateral value of assets to support borrowings from the discount window. As of March 31, 2016, the Bank had $1.7 billion available for discount window borrowings.

• The Parent Company has a $200 million commercial paper program, of which, $64 million was outstanding as of March 31, 2016.

• Dividends and service fees from subsidiaries, as well as the proceeds from issuance of capital are also funding sources for the Parent Company.

• The Parent Company has filed a shelf registration statement with the SEC under which the Parent Company may, from time to time, offer shares of the Corporation’s common stock in connection with acquisitions of businesses, assets or securities of other companies.

• The Parent Company also has filed a universal shelf registration statement with the SEC, under which the Parent Company may offer the following securities, either separately or in units: debt securities, preferred stock, depositary shares, common stock, and warrants.

• The Bank may also issue institutional certificates of deposit, network transaction deposits, and brokered certificates of deposit.

Credit ratings relate to the Corporation’s ability to issue debt securities and the cost to borrow money, and should not be viewed as an indication of future stock performance or a recommendation to buy, sell, or hold securities. Adverse changes in these factors could result in a negative change in credit ratings and impact not only the ability to raise funds in the capital markets but also the cost of these funds. The credit ratings of the Parent Company and the Bank at March 31, 2016 are displayed below.

TABLE 13: Credit Ratings

	Moody’s	S&P*
Bank short-term deposits	P1	-
Bank long-term	A1	BBB+
Corporation short-term	P2	-
Corporation long-term	Baa1	BBB
Outlook	Negative	Stable
* - Standard and Poor's

For the three months ended March 31, 2016, net cash provided by operating and financing activities was $22 million and $405 million, respectively, while investing activities used net cash of $526 million, for a net decrease in cash and cash equivalents of $98 million since year-end 2015. During the first quarter of 2016, assets increased to $28.2 billion (up $467 million or 2%) compared to year-end 2015, primarily due to a $513 million increase in loans. On the funding side, deposits decreased $322 million while short-term and long-term funding increased $583 million and $185 million, respectively.

For the three months ended March 31, 2015, net cash provided by operating and financing activities was $11 million and $138 million, respectively, while investing activities used net cash of $334 million, for a net decrease in cash and cash equivalents of $185 million since year-end 2014. During the first three months of 2015, assets increased $247 million, including a $385 million increase in loans, while investment securities were down $5 million. On the funding side, deposits increased $1.1 billion, while long-term funding decreased $500 million and short-term funding decreased $406 million.

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Quantitative and Qualitative Disclosures about Market Risk

Market risk and interest rate risk are managed centrally. Market risk is the potential for loss arising from adverse changes in the fair value of fixed income securities, equity securities, other earning assets and derivative financial instruments as a result of changes in interest rates or other factors. Interest rate risk is the potential for reduced net interest income resulting from adverse changes in the level of interest rates. As a financial institution that engages in transactions involving an array of financial products, the Corporation is exposed to both market risk and interest rate risk. In addition to market risk, interest rate risk is measured and managed through a number of methods. The Corporation uses financial modeling simulation techniques that measure the sensitivity of future earnings due to changing rate environments to measure interest rate risk.

Policies established by the Corporation’s Asset / Liability Committee (“ALCO”) and approved by the Board of Directors are intended to limit these risks. The Board has delegated day-to-day responsibility for managing market and interest rate risk to ALCO. The primary objectives of market risk management is to minimize any adverse effect that changes in market risk factors may have on net interest income and to offset the risk of price changes for certain assets recorded at fair value.

Interest Rate Risk

The primary goal of interest rate risk management is to control exposure to interest rate risk within policy limits approved by the Board of Directors. These limits and guidelines reflect our risk appetite for interest rate risk over both short-term and long-term horizons. No limit breaches occurred during the first three months of 2016.

The major sources of our non-trading interest rate risk are timing differences in the maturity and re-pricing characteristics of assets and liabilities, changes in the shape of the yield curve, and the potential exercise of explicit or embedded options. We measure these risks and their impact by identifying and quantifying exposures through the use of sophisticated simulation and valuation models which are employed by management to understand net interest income (NII) at risk, interest rate sensitive earnings at risk (EAR), and market value of equity (MVE) at risk. These measures show that our interest rate risk profile was slightly asset sensitive at March 31, 2016.

For further discussion of the Corporation's interest rate risk and corresponding key assumptions, see the Interest Rate Risk section of Management’s Discussion and Analysis of Financial Condition and Results of Operations included in the Corporation’s 2015 Annual Report on Form 10-K.

The sensitivity analysis included below is measured as a percentage change in NII and EAR due to instantaneous moves in benchmark interest rates from a baseline scenario. We evaluate the sensitivity using: 1) a dynamic forecast incorporating expected growth in the balance sheet, and 2) a static forecast where the current balance sheet is held constant.

TABLE 14: Estimated % Change in Net Interest Income Over 12 Months

	Estimated % Change in Rate Sensitive Earnings at Risk (EAR) Over 12 Months
	Dynamic Forecast March 31, 2016		Static Forecast March 31, 2016		Dynamic Forecast December 31, 2015		Static Forecast December 31, 2015
Instantaneous Rate Change
100 bp increase in interest rates	0.7	%	0.6	%	1.6	%	2.1	%
200 bp increase in interest rates	1.4	%	1.3	%	3.0	%	4.4	%

At March 31, 2016, the MVE profile indicates a decline in net balance sheet value due to instantaneous upward changes in rates.

TABLE 15: Market Value of Equity Sensitivity

	March 31, 2016		December 31, 2015
Instantaneous Rate Change
100 bp increase in interest rates	(2.6	)%	(1.7	)%
200 bp increase in interest rates	(5.7	)%	(3.7	)%

While an instantaneous and severe shift in interest rates was used in this analysis to provide an estimate of exposure under an extremely adverse scenario, the Corporation believes that a gradual shift in interest rates would have a much more modest impact. Since MVE measures the discounted present value of cash flows over the estimated lives of instruments, the change in MVE does not directly correlate to the degree that earnings would be impacted over a shorter time horizon (i.e., the current year). Further,

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MVE does not take into account factors such as future balance sheet growth, changes in product mix, changes in yield curve relationships, and changing product spreads that could mitigate the adverse impact of changes in interest rates.

The above NII, EAR, and MVE measures do not include all actions that management may undertake to manage this risk in response to anticipated changes in interest rates.

Contractual Obligations, Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities

TABLE 16: Contractual Obligations and Other Commitments

March 31, 2016	One Year or Less		One to Three Years		Three to Five Years		Over Five Years		Total
	($ in Thousands)
Time deposits	$	874,467	$	426,834	$	260,563	$	6,178	$	1,568,042
Short-term funding	1,417,408		—		—		—		1,417,408
Long-term funding	22		2,115,000		498,828		247,466		2,861,316
Operating leases	10,417		18,635		15,931		17,968		62,951
Commitments to extend credit	3,909,904		2,269,872		1,432,370		121,632		7,733,778
Total	$	6,212,218	$	4,830,341	$	2,207,692	$	393,244	$	13,643,495

The Corporation utilizes a variety of financial instruments in the normal course of business to meet the financial needs of its customers and to manage its own exposure to fluctuations in interest rates. These financial instruments include lending-related commitments and derivative instruments. A discussion of the Corporation’s derivative instruments at March 31, 2016, is included in Note 10, “Derivative and Hedging Activities,” of the notes to consolidated financial statements. A discussion of the Corporation’s lending-related commitments is included in Note 12, “Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings,” of the notes to consolidated financial statements. See also Note 9, “Short and Long-Term Funding,” of the notes to consolidated financial statements for additional information on the Corporation’s short-term and long-term funding.

Table 16 summarizes significant contractual obligations and other commitments at March 31, 2016, at those amounts contractually due to the recipient, including any premiums or discounts, hedge basis adjustments, or other similar carrying value adjustments.

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Capital

TABLE 17: Capital Ratios

	Quarter Ended
	March 31, 2016			December 31, 2015			September 30, 2015			June 30, 2015			March 31, 2015
	(In Thousands, except per share data)
Tangible stockholders’ equity (1)	$	1,993,581		$	1,951,944		$	1,967,975		$	1,917,683		$	1,895,112
Tangible assets (1)	27,189,950			26,726,533			26,477,944			26,194,670			26,077,655
Risk-based Capital (2)
Tier 1 capital	2,021,125			2,016,861			1,983,612			1,941,694			1,897,390
Total capital	2,526,653			2,515,861			2,481,661			2,436,594			2,391,797
Total risk-weighted assets	20,453,744			19,929,963			19,866,379			19,610,281			19,574,457
Common equity Tier 1 capital ratio	9.30		%	9.52		%	9.39		%	9.31		%	9.39		%
Tier 1 capital ratio	9.88			10.12			9.98			9.90			9.69
Total capital ratio	12.35			12.62			12.49			12.43			12.22
Tier 1 leverage ratio	7.55			7.60			7.53			7.53			7.39
Selected Equity and Performance Ratios (1) (2)
Total stockholders’ equity / assets	10.58		%	10.60		%	10.76		%	10.69		%	10.65		%
Tangible common equity / tangible assets	6.89			6.85			6.97			6.86			7.04
Tangible stockholders’ equity / tangible assets	7.33			7.30			7.43			7.32			7.27
Return on average equity	5.76			5.86			6.81			6.93			6.65
Return on average tangible common equity	8.72			8.78			10.35			10.62			10.16
Return on average Common equity Tier 1	8.55			8.60			10.20			10.55			10.22
Return on average assets	0.62			0.62			0.72			0.74			0.71
Tangible Common Equity and Common Equity Tier 1 Reconciliation (1) (2)
Common equity	$	2,862,151		$	2,815,867		$	2,832,418		$	2,782,376		$	2,822,411
Goodwill and other intangible assets	(988,917		)	(985,302		)	(985,822		)	(986,707		)	(987,025		)
Tangible common equity	1,873,234			1,830,565			1,846,596			1,795,669			1,835,386
Less: Accumulated other comprehensive income (loss)	(2,167		)	32,616			(15,376		)	(2,594		)	(24,800		)
Less: Deferred tax assets/deferred tax liabilities, net	31,526			34,763			34,069			32,403			27,077
Common equity Tier 1	$	1,902,593		$	1,897,944		$	1,865,289		$	1,825,478		$	1,837,663
Average Tangible Common Equity and Common Equity Tier 1 Reconciliation (1) (2)
Common equity	$	2,849,382		$	2,819,267		$	2,797,630		$	2,794,341		$	2,785,004
Goodwill and other intangible assets	(989,127		)	(985,605		)	(986,360		)	(987,071		)	(970,572		)
Tangible common equity	1,860,255			1,833,662			1,811,270			1,807,270			1,814,432
Less: Accumulated other comprehensive income (loss)	3,320			4,266			(6,601		)	(16,305		)	(17,867		)
Less: Deferred tax assets/deferred tax liabilities, net	32,906			34,199			32,767			28,854			7,652
Average common equity Tier 1	$	1,896,481		$	1,872,127		$	1,837,436		$	1,819,819		$	1,804,217

(1) The ratios tangible common equity to tangible assets and tangible equity to tangible stockholders' assets exclude goodwill and other intangible assets, which is a non-GAAP financial measure. These financial measures have been included as they are considered to be critical metrics with which to analyze and evaluate financial condition and capital strength. See Note 8 for additional information on goodwill, core deposit intangibles, and other intangibles.

(2) The Federal Reserve establishes regulatory capital adequacy requirements, including well-capitalized standards for the Corporation. The regulatory capital requirements effective for the Corporation follow Basel III, subject to certain transition provisions. These non-GAAP regulatory capital measurements are used by management, regulators, investors, and analysts to assess, monitor and compare the quality and composition of our capital with the capital of other financial services companies.

Management actively reviews capital strategies for the Corporation and each of its subsidiaries in light of perceived business risks, future growth opportunities, industry standards, and compliance with regulatory requirements. The assessment of overall capital adequacy depends on a variety of factors, including asset quality, liquidity, stability of earnings, changing competitive forces, economic condition in markets served, and strength of management. At March 31, 2016, the capital ratios of the Corporation and its banking subsidiary were in excess of regulatory minimum requirements. The Corporation’s capital ratios are summarized in Table 17.

During the first quarter of 2016, the Corporation repurchased over 1 million shares of common stock for $20 million or an average cost of $17.10 per share. The Corporation also repurchased approximately $1 million of depositary shares, each representing a

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1/40th interest of a share of the 8.00% Non-Cumulative Perpetual Preferred Stock, Series B, during the first quarter of 2016. See Part II, Item 2, “Unregistered Sales of Equity Securities and Use of Proceeds,” for additional information on the shares repurchased during the first quarter of 2016. The repurchase of shares will be based on market and investment opportunities, capital levels, growth prospects, and regulatory constraints. Such repurchases may occur from time to time in open market purchases, block transactions, private transactions, accelerated share repurchase programs, or similar facilities.

Sequential Quarter Results

The Corporation reported net income of $43 million for both the first quarter of 2016 and the fourth quarter of 2015. Net income available to common equity was $40 million for the first quarter of 2016 or net income of $0.27 for both basic and diluted earnings per common share. Comparatively, net income available to common equity for the fourth quarter of 2015, was $41 million, or net income of $0.27 for both basic and diluted earnings per common share (see Table 1).

Fully tax-equivalent net interest income for both the first quarter of 2016 and the fourth quarter of 2015 was $177 million. The Federal funds target rate remained constant at 0.50%. The net interest margin in the first quarter of 2016 was down 1 bp, to 2.81%. Average earning assets increased $249 million to $25.3 billion in the first quarter of 2016, with average loans up $380 million, while average investments and other short-term investments were down $131 million (primarily in mortgage related securities). On the funding side, average interest-bearing deposits were down $70 million (primarily money market deposits) while noninterest bearing demand deposits were up $29 million. Average short and long-term funding increased $270 million (primarily FHLB advances, which was partially offset by the early redemption of $430 million of senior notes) (see Table 2).

The provision for credit losses was $20 million for both the first quarter of 2016 and the fourth quarter of 2015 (see Table 10). See discussion under sections, “Provision for Credit Losses,” “Nonaccrual Loans, Potential Problem Loans, and Other Real Estate Owned,” and “Allowance for Credit Losses.”

Noninterest income for both the first quarter of 2016 and the fourth quarter of 2015 was $83 million. Fee-based revenue increased $2 million (3%) from the fourth quarter of 2015, primarily due to seasonally higher insurance commissions. Bank owned life insurance increased $2 million primarily due to increased proceeds from BOLI policy redemptions received during the first quarter of 2016. Net mortgage banking income was $4 million, down $4 million from the fourth quarter of 2015, primarily driven by a $2 million decrease in gain on sale of loans, a $1 million unfavorable change in fair value of mortgage derivatives, and an increase in mortgage servicing rights expense primarily due to a $1 million addition to the valuation reserve (see Table 3).

Noninterest expense decreased $2 million (1%) to $174 million. Personnel expense was $101 million for the first quarter of 2016, up $1 million (1%) from the fourth quarter of 2015, primarily attributable to the accelerated vesting of stock options and restricted stock awards granted to retirement eligible colleagues. Occupancy expense decreased $1 million, primarily due to a recovery on a lease breakage fee during the first quarter of 2016. Legal and professional fees was $5 million, up $1 million from the fourth quarter of 2015, primarily driven by higher consulting fees. All remaining noninterest expense categories on a combined basis were down $3 million (5%) compared to fourth quarter of 2015 (see Table 4).

For the first quarter of 2016, the Corporation recognized income tax expense of $19 million, compared to income tax expense of $16 million for fourth quarter of 2015. The effective tax rate was 30.51% and 26.82% for the first quarter of 2016 and the fourth quarter of 2015, respectively.

Segment Review

As discussed in Note 15, “Segment Reporting,” of the notes to consolidated financial statements, the Corporation’s reportable segments have been determined based upon its internal profitability reporting system, which is organized by strategic business unit. Certain strategic business units have been combined for segment information reporting purposes where the nature of the products and services, the type of customer, and the distribution of those products and services are similar. The reportable segments are Corporate and Commercial Specialty; Community, Consumer and Business; and Risk Management and Shared Services.

FTP is an important tool for managing the Corporation’s balance sheet structure and measuring risk-adjusted profitability. By appropriately allocating the cost of funding and contingent liquidity to business units, the FTP process improves product pricing which influences the volume and terms of new business and helps to optimize the risk / reward profile of the balance sheet. This process helps align the Corporation’s funding and contingent liquidity risk with its risk appetite and complements broader liquidity and interest rate risk management programs. FTP methodologies are designed to promote more resilient, sustainable business models and centralize the management of funding and contingent liquidity risks. Through FTP, the Corporation transfers these risks to a central management function that can take advantage of natural off-sets, centralized hedging activities, and a broader view of these risks across business units.

During 2016, certain presentation changes were made and, accordingly, 2015 results have been restated and presented on a comparable basis. See Note 1, "Basis of Presentation" for additional information on the change in presentation.

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Comparable Quarter Segment Review

The Corporate and Commercial Specialty segment had net income of $29 million for the first quarter of 2016, relatively unchanged from the comparable quarter in 2015. Segment revenue increased $2 million compared to first quarter of 2015, primarily due to growth in average loan balances. Average loan balances were $9.7 billion for the first quarter of 2016, up $500 million from an average balance of $9.2 billion for first quarter of 2015. The credit provision increased $3 million to $13 million for the first quarter of 2016, due to increased loan growth and a decrease in loan credit quality in the oil and gas portfolio. Average deposit balances were $5.9 billion for the first quarter of 2016, up $497 million from the comparable quarter of 2015. Average allocated capital increased $89 million to $1.0 billion for first quarter of 2016.

The Community, Consumer, and Business Banking segment had net income of $14 million for the first quarter of 2016, down $3 million compared to $17 million for first quarter of 2015. Earnings decreased as segment revenue declined $2 million to $149 million for the first quarter of 2016, primarily due to lower mortgage banking income as refinancing activity has slowed. The credit provision decreased $1 million to $6 million for the first quarter of 2016, due to improvement in the loan credit quality. Total noninterest expense for first quarter of 2016 was $121 million, up $3 million from the comparable quarter of 2015. Average loan balances were $9.1 billion for the first quarter of 2016, up $594 million from the comparable quarter of 2015. Average deposits were $11.1 billion for the first quarter of 2016, up $578 million from average deposits of $10.5 billion for the comparable quarter of 2015.

The Risk Management and Shared Services segment had a net loss of $1 million for the first quarter of 2016, down $2 million compared to net income of $1 million for the comparable quarter in 2015. The credit provision increased $13 million due to increased loan growth and a decrease in loan credit quality. The increase in credit provision was partially offset by a $6 million increase in noninterest income. The increase in noninterest income was primarily due to the $3 million net investment securities gains from the continued restructuring of the Corporation's investment securities portfolio. Average earning asset balances were $6.4 billion for first quarter of 2016, up $28 million from the comparable quarter of 2015, and average deposits were $3.6 billion for first quarter of 2016, up $446 million versus the comparable quarter of 2015. Average allocated capital increased $24 million to $238 million for first quarter of 2016.

Critical Accounting Policies

In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ significantly from those estimates. Estimates that are particularly susceptible to significant change include the determination of the allowance for loan losses, goodwill impairment assessment, mortgage servicing rights valuation, and income taxes. A discussion of these policies can be found in the "Critical Accounting Policies" section in Management's Discussion and Analysis of Financial Condition and Results of Operations included in the Corporation’s 2015 Annual Report on Form 10-K. There have been no changes in the Corporation's application of critical accounting policies since December 31, 2015. The mortgage servicing rights valuation has been included due to the continued impact of the low interest rate environment.

Mortgage Servicing Rights Valuation: The fair value of the Corporation's mortgage servicing rights asset is important to the presentation of the consolidated financial statements since the mortgage servicing rights are carried on the consolidated balance sheet at the lower of amortized cost or estimated fair value. Mortgage servicing rights do not trade in an active open market with readily observable prices. As such, like other participants in the mortgage banking business, the Corporation relies on an independent valuation from a third party which uses a discounted cash flow model to estimate the fair value of its mortgage servicing rights. The use of a discounted cash flow model involves judgment, particularly of estimated prepayment speeds of underlying mortgages serviced and the overall level of interest rates. Loan type and note interest rate are the predominant risk characteristics of the underlying loans used to stratify capitalized mortgage servicing rights for purposes of measuring impairment. The Corporation periodically reviews the assumptions underlying the valuation of mortgage servicing rights. While the Corporation believes that the values produced by the discounted cash flow model are indicative of the fair value of its mortgage servicing rights portfolio, these values can change significantly depending upon key factors, such as the then current interest rate environment, estimated prepayment speeds of the underlying mortgages serviced, and other economic conditions. The proceeds that might be received should the Corporation actually consider a sale of some or all of the mortgage servicing rights portfolio could differ from the valuation amounts reported at any point in time.

To better understand the sensitivity of the impact of prepayment speeds and refinance rates on the value of the mortgage servicing rights asset at March 31, 2016, (holding all other factors unchanged), if refinance rates were to decrease 50 bp, the estimated value of the mortgage servicing rights asset would have been approximately $11 million (or 17%) lower. Conversely, if refinance rates were to increase 50 bp, the estimated value of the mortgage servicing rights asset would have been approximately $9 million (or 14%) higher. However, the Corporation's potential recovery recognition due to valuation improvement is limited to the balance of the mortgage servicing rights valuation reserve, which was approximately $2 million at March 31, 2016. The potential recovery

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recognition is constrained as the Corporation has elected to use the amortization method of accounting (rather than fair value measurement accounting). Under the amortization method, mortgage servicing rights are carried at the lower of the initial capitalized amount, net of accumulated amortization, or estimated fair value. Therefore, the mortgage servicing right asset may only be marked up to the extent of the previously recognized valuation reserve. The Corporation believes the mortgage servicing rights asset is properly recorded in the consolidated financial statements. See Note 8, "Goodwill and Other Intangible Assets," of the notes to consolidated financial statements and section "Noninterest Income."

Future Accounting Pronouncements

New accounting policies adopted by the Corporation are discussed in Note 3, “New Accounting Pronouncements Adopted,” of the notes to consolidated financial statements. The expected impact of accounting pronouncements recently issued or proposed but not yet required to be adopted are discussed below. To the extent the adoption of new accounting standards materially affects the Corporation’s financial condition, results of operations, or liquidity, the impacts are discussed in the applicable sections of this financial review and the notes to consolidated financial statements.

In March 2016, the FASB issued an amendment involving several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. This amendment is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2016. Entities should apply the amendment related to the timing of when excess tax benefits are recognized, minimum statutory withholding requirements, forfeitures, and intrinsic value using a modified retrospective transition method by means of a cumulative-effect adjustment to equity as of the beginning of the period in which the guidance is adopted. Entities should apply the amendment related to the presentation of employee taxes paid on the statement of cash flows when an employer withholds shares to meet the minimum statutory withholding requirement retrospectively. The amendment requiring recognition of excess tax benefits and tax deficiencies in the income statement and the practical expedient for estimating expected term should be applied prospectively. An entity may elect to apply the amendments related to the presentation of excess tax benefits on the statement of cash flows using either a prospective transition method or a retrospective transition method. Early adoption is permitted. The Corporation intends to adopt the accounting standard during the first quarter of 2017, as required, and is currently evaluating the impact on its results of operations, financial position, and liquidity.

In March 2016, the FASB issued an amendment to eliminate the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. Therefore, upon qualifying for the equity method of accounting, no retroactive adjustment of the investment is required. The amendments require that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. This amendment is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2016. Entities should apply the amendment prospectively to increases in the level of ownership interest or degree of influence that result in the adoption of the equity method. Early adoption is permitted. The Corporation intends to adopt the accounting standard during the first quarter of 2017, as required, and is currently evaluating the impact on its results of operations, financial position, and liquidity.

In February 2016, the FASB issued an amendment to provide transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. This amendment will require lessees to recognize the following for all leases (with the exception of short-term leases) at the commencement date: 1) a lease liability, which is a lessee's obligation to make lease payments arising from a lease, measured on a discounted basis; and 2) a right-of-use asset, which is an asset that represents the lessee's right to use, or control the use of, a specified asset for the lease term. Under the new guidance, lessor accounting is largely unchanged. This amendment is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2018. Entities are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The modified retrospective approach includes a number of optional practical expedients that entities may elect to apply. These practical expedients relate to the identification and classification of leases that commenced before the effective date, initial direct costs for leases that commenced before the effective date, and the ability to use hindsight in evaluating lessee options to extend or terminate a lease or to purchase the underlying asset. Early adoption is permitted. The Corporation intends to adopt the accounting standard during the first quarter of 2019, as required, and is currently evaluating the impact on its results of operations, financial position, and liquidity.

In January 2016, the FASB issued an amendment to address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. This amendment supersedes the guidance to classify equity securities with readily determinable

65

fair values into different categories, requires equity securities to be measured at fair value with changes in the fair value recognized through net income, and simplifies the impairment assessment of equity investments without readily determinable fair values. The amendment requires public business entities that are required to disclose the fair value of financial instruments measured at amortized cost on the balance sheet to measure that fair value using the exit price notion. The amendment 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 a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option. The amendment requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or in the accompanying notes to the financial statements. The amendment reduces diversity in current practice by clarifying that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the entity’s other deferred tax assets. This amendment is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Entities should apply the amendment by means of a cumulative-effect adjustment as of the beginning of the fiscal year of adoption, with the exception of the amendment related to equity securities without readily determinable fair values, which should be applied prospectively to equity investments that exist as of the date of adoption. The Corporation intends to adopt the accounting standard during the first quarter of 2018, as required, and is currently evaluating the impact on its results of operations, financial position, and liquidity.

In May 2014, the FASB issued an amendment to clarify the principles for recognizing revenue and to develop a common revenue standard. The standard outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The core principle of the revenue model is that “an entity recognizes 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.” In applying the revenue model to contracts within its scope, an entity should apply the following steps: (1) Identify the contract(s) with a customer, (2) Identify the performance obligations in the contract, (3) Determine the transaction price, (4) Allocate the transaction price to the performance obligations in the contract, and (5) Recognize revenue when (or as) the entity satisfies a performance obligation. The standard applies to all contracts with customers except those that are within the scope of other topics in the FASB Codification. The standard also requires significantly expanded disclosures about revenue recognition. In March 2016, the FASB issued amendments that intend to improve the operability and understandability of the implementation guidance on principal versus agent considerations by amending certain existing illustrative examples and adding additional illustrative examples to assist in the application of the guidance. The amendment was originally effective for annual reporting periods beginning after December 15, 2016 (including interim reporting periods within those periods); however, in July 2015, the FASB approved a one year deferral of the effective date to December 31, 2017. Early application is not permitted. The Corporation intends to adopt the accounting standard during the first quarter of 2018, as required, and is currently evaluating the impact on its results of operations, financial position, and liquidity.

Recent Developments

On April 26, 2016, the Board of Directors declared a regular quarterly cash dividend of $0.11 per common share, payable on June 15, 2016, to shareholders of record at the close of business on June 1, 2016. The Board of Directors also declared a regular quarterly cash dividend of $0.50 per depositary share on Associated Banc-Corp’s 8.00% Series B Non-Cumulative Perpetual Preferred Stock and a regular quarterly cash dividend of $0.3828125 per depositary share on Associated Banc-Corp’s 6.125% Series C Non-Cumulative Perpetual Preferred Stock payable on June 15, 2016, to shareholders of record at the close of business on June 1, 2016. These cash dividends have not been reflected in the accompanying consolidated financial statements.

ITEM 3.     QUANTITATIVEAND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Information required by this item is set forth in Item 2 under the captions “Quantitative and Qualitative Disclosures about Market Risk” and “Interest Rate Risk.”

ITEM 4.     CONTROLS AND PROCEDURES

The Corporation maintains disclosure controls and procedures as required under Rule 13a-15 promulgated under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), that are designed to ensure that information required to be disclosed in our Exchange Act reports is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to the Corporation’s management, including its Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

As of March 31, 2016 the Corporation’s management carried out an evaluation, under the supervision and with the participation of the Corporation’s Chief Executive Officer and Chief Financial Officer, of the effectiveness of its disclosure controls and

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procedures. Based on the foregoing, its Chief Executive Officer and Chief Financial Officer concluded that the Corporation’s disclosure controls and procedures were effective as of March 31, 2016. No changes were made to the Corporation’s internal control over financial reporting (as defined in Rule 13a-15(f) of the Exchange Act of 1934) during the last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the Corporation’s internal control over financial reporting.

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PART II - OTHER INFORMATION

ITEM 1. Legal Proceedings

The information required by this item is set forth in Part I, Item I under Note 12, "Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings."

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

Following are the Corporation’s monthly common stock and depositary share purchases during the first quarter of 2016. For additional discussion on the Corporation's common stock and depositary share purchases, see section “Capital” included under Part I Item 2 of this document.

Common Stock Purchases:
	Total Number  of Shares Purchased(a)	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Number of Shares that May Yet Be Purchased Under the Plans or Programs(b)
Period
January 1, 2016 - January 31, 2016	1,089,112	$	17.11	1,089,112	—
February 1, 2016 - February 29, 2016	80,747	16.93		80,747	—
March 1, 2016 - March 31, 2016	—	—		—	—
Total	1,169,859	$	17.10	1,169,859	4,899,421

(a) During the first quarter of 2016, the Corporation repurchased approximately 168,000 common shares for minimum tax withholding settlements on equity compensation. These purchases do not count against the maximum number of shares that may yet be purchased under the Board of Directors’ authorization.

(b) On April 21, 2015, the Board of Directors authorized the repurchase of up to $125 million of the Corporation's common stock, of which approximately $88 million remained available to repurchase as of March 31, 2016. Using the closing stock price on March 31, 2016 of $17.94, a total of approximately 4.9 million shares of common stock remained available to be repurchased under the previously approved Board authorizations as of March 31, 2016.

Series B Preferred Stock Depositary Share Purchases:
	Total Number  of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of  Publicly Announced Plans or Programs	Maximum Number of Shares that May Yet Be Purchased Under the Plans or Programs(a)
Period
January 1, 2016 - January 31, 2016	—	$	—	—	—
February 1, 2016 - February 29, 2016	—	—		—	—
March 1, 2016 - March 31, 2016	42,405	25.74		42,405	—
Total	42,405	$	25.74	42,405	135,209

(a) In 2011, the Corporation issued 2,600,000 depositary shares, each representing a 1/40th interest in a share of the Corporation’s 8.00% Non-Cumulative Perpetual Preferred Stock, Series B (the “Series B Preferred Stock”). During 2013, the Board of Directors authorized the repurchase of up to $10 million of the Series B Preferred Stock. As of March 31, 2016, approximately $3.5 million remained available under this repurchase authorization. Using the closing price on March 31, 2016 of $25.85, a total of approximately 135,000 shares remained available to be repurchased under the previously approved Board authorization as of March 31, 2016.

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Series C Preferred Stock Depositary Share Purchases:
	Total Number  of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of  Publicly Announced Plans or Programs	Maximum Number of Shares that May Yet Be Purchased Under the Plans or Programs(a)
Period
January 1, 2016 - January 31, 2016	—	$	—	—	—
February 1, 2016 - February 29, 2016	—	—		—	—
March 1, 2016 - March 31, 2016	—	—		—	—
Total	—	$	—	—	—

(a) In June 2015, the Corporation issued 2,600,000 depositary shares, each representing a 1/40th interest in a share of the Corporation’s 6.125% Non-Cumulative Perpetual Preferred Stock, Series C (the “Series C Preferred Stock”). On August 28, 2015, the Board of Directors authorized the repurchase of up to $10 million of the Series C Preferred Stock. As of March 31, 2016, $10 million remained available under this repurchase authorization as the Corporation has not yet repurchased any of the Series C Preferred Stock under this authorization. Using the closing price on March 31, 2016 of $25.60, a total of approximately 391,000 shares remained available to be repurchased under the previously approved Board authorization as of March 31, 2016.

ITEM 6. Exhibits

(a)    Exhibits:

Exhibit (11), Statement regarding computation of per share earnings. See Note 4 of the notes to consolidated financial statements in Part I Item 1.

Exhibit (31.1), Certification Under Section 302 of Sarbanes-Oxley by Philip B. Flynn, Chief Executive Officer.

Exhibit (31.2), Certification Under Section 302 of Sarbanes-Oxley by Christopher J. Del Moral-Niles, Chief Financial Officer.

Exhibit (32), Certification by the Chief Executive Officer and Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of Sarbanes-Oxley.

Exhibit (101), Interactive data files pursuant to Rule 405 of Regulation S-T: (i) Unaudited Consolidated Balance Sheets, (ii) Unaudited Consolidated Statements of Income, (iii) Unaudited Consolidated Statements of Comprehensive Income, (iv) Unaudited Consolidated Statements of Changes in Stockholders’ Equity, (v) Unaudited Consolidated Statements of Cash Flows, and (vi) Notes to Consolidated Financial Statements.

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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 hereunto duly authorized.

	ASSOCIATED BANC-CORP
	(Registrant)
Date: April 28, 2016	/s/ Philip B. Flynn
	Philip B. Flynn
	President and Chief Executive Officer
Date: April 28, 2016	/s/ Christopher J. Del Moral-Niles
	Christopher J. Del Moral-Niles
	Chief Financial Officer and Principal Accounting Officer

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EX-31.1

Exhibit 31.1

CERTIFICATION UNDER SECTION 302 OF THE

SARBANES-OXLEY ACT OF 2002

CERTIFICATIONS

I, Philip B. Flynn, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Associated Banc-Corp;

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(s) 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(s) 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 the 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: April 28, 2016	/s/ Philip B. Flynn
	Philip B. Flynn
	President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION UNDER SECTION 302 OF THE

SARBANES-OXLEY ACT OF 2002

CERTIFICATIONS

I, Christopher J. Del Moral-Niles, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Associated Banc-Corp;

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(s) 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(s) 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 the 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: April 28, 2016	/s/ Christopher J. Del Moral-Niles
	Christopher J. Del Moral-Niles
	Chief Financial Officer

EX-32

Exhibit 32

Certification by the Chief Executive Officer and Chief Financial

Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant

to Section 906 of the Sarbanes-Oxley Act of 2002

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, each of the undersigned officers of Associated Banc-Corp, a Wisconsin corporation (the “Company”), does hereby certify that:

1. The accompanying Quarterly Report of the Company on Form 10-Q for the quarter ended March 31, 2016 (the “Report”), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. Information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Philip B. Flynn

Philip B. Flynn

Chief Executive Officer

April 28, 2016

/s/ Christopher J. Del Moral-Niles

Christopher J. Del Moral-Niles

Chief Financial Officer

April 28, 2016

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	Apr. 27, 2016
Document And Entity Information [Abstract]
Trading Symbol	ASB
Entity Registrant Name	ASSOCIATED BANC-CORP
Entity Central Index Key	0000007789
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Amendment Flag	false
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		150,136,403

XML

Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks		$ 287,183	$ 374,921
Interest-bearing deposits in other financial institutions		68,025	79,764
Federal funds sold and securities purchased under agreements to resell		20,200	19,000
Investment securities held to maturity, at amortized cost		1,176,821	1,168,230
Investment securities available for sale, at fair value		4,905,841	4,967,414
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost		181,853	147,240
Loans held for sale		128,339	124,915
Loans		19,227,240	18,714,343
Allowance for loan losses		(277,370)	(274,264)
Loans, net		18,949,870	18,440,079
Premises and equipment, net		331,711	267,606
Goodwill		971,951	968,844
Mortgage servicing rights		59,414	61,341
Other intangible assets		16,966	16,458
Trading assets		53,087	32,192
Other assets	[1]	1,027,606	1,043,831
Total assets		28,178,867	27,711,835
LIABILITIES AND STOCKHOLDERS’ EQUITY
Noninterest-bearing demand deposits		5,272,685	5,562,466
Interest-bearing deposits		15,412,775	15,445,199
Total deposits		20,685,460	21,007,665
Federal funds purchased and securities sold under agreements to repurchase		583,247	431,438
Other short-term funding		834,161	402,978
Long-term funding	[1]	2,861,316	2,676,164
Trading liabilities		55,223	33,430
Accrued expenses and other liabilities		176,962	222,914
Total liabilities		25,196,369	24,774,589
Stockholders’ equity
Preferred equity		120,347	121,379
Common stock		1,630	1,642
Surplus		1,447,368	1,458,522
Retained earnings		1,599,835	1,593,239
Accumulated other comprehensive loss		2,167	(32,616)
Treasury stock, at cost		(188,849)	(204,920)
Total common equity		2,862,151	2,815,867
Total stockholders’ equity		2,982,498	2,937,246
Total liabilities and stockholders’ equity		$ 28,178,867	$ 27,711,835
Preferred shares issued (in shares)		124,054	125,114
Preferred shares authorized (par value $1.00 per share) (in shares)		750,000	750,000
Common shares issued (in shares)		163,030,209	164,200,068
Common shares authorized (par value $0.01 per share) (in shares)		250,000,000	250,000,000
Treasury shares of common stock (in shares)		12,036,645	12,960,636

[1] During the first quarter of 2016, the Corporation adopted a new accounting standard related to simplifying the presentation of debt issuance costs. Under this new accounting standard, debt issuance costs are still capitalized; however, they are reflected on the balance sheet with the related debt issued rather than within other assets. All prior periods have been restated to reflect this change in presentation. See Note 3 for additional information on this new accounting standard.

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Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
INTEREST INCOME
Interest and fees on loans	$ 159,656	$ 151,945
Interest and dividends on investment securities:
Taxable	25,516	25,092
Tax exempt	7,830	7,887
Other interest	1,067	1,692
Total interest income	194,069	186,616
INTEREST EXPENSE
Interest on deposits	11,766	7,619
Interest on Federal funds purchased and securities sold under agreements to repurchase	296	231
Interest on other short-term funding	515	81
Interest on long-term funding	9,505	10,872
Total interest expense	22,082	18,803
NET INTEREST INCOME	171,987	167,813
Provision for credit losses	20,000	4,500
Net interest income after provision for credit losses	151,987	163,313
NONINTEREST INCOME
Trust service fees	11,447	12,087
Service charges on deposit accounts	16,273	15,806
Card-based and other nondeposit fees	11,991	12,416
Insurance commissions	21,382	19,728
Brokerage and annuity commissions	3,794	3,683
Mortgage banking, net	4,204	7,408
Capital market fees, net	3,538	2,467
Bank owned life insurance income	4,770	2,875
Asset gains, net	524	833
Investment securities gains, net	3,098	0
Other	2,171	2,510
Total noninterest income	83,192	79,813
NONINTEREST EXPENSE
Personnel expense	101,398	100,152
Occupancy	13,802	17,683
Equipment	5,446	5,772
Technology	14,264	15,558
Business development and advertising	8,211	5,327
Other intangible amortization	504	801
Loan expense	3,221	2,996
Legal and professional fees	5,025	4,538
Foreclosure / OREO expense	1,877	1,162
FDIC expense	7,750	6,500
Other	12,473	13,503
Total noninterest expense	173,971	173,992
Income before income taxes	61,208	69,134
Income tax expense	18,674	22,462
Net income	42,534	46,672
Preferred stock dividends	2,198	1,228
Net income available to common equity	$ 40,336	$ 45,444
Earnings per common share:
Basic (in usd per share)	$ 0.27	$ 0.30
Diluted (in usd per share)	$ 0.27	$ 0.30
Average common shares outstanding:
Basic (in shares)	148,601	150,070
Diluted (in shares)	149,454	151,164

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Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Preferred shares, par value	$ 1.00	$ 1.00
Common shares, par value	$ 0.01	$ 0.01

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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 42,534	$ 46,672
Investment securities available for sale:
Net unrealized gains (losses)	60,422	47,418
Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities	(1,572)	0
Reclassification adjustment for net gains realized in net income	(3,098)	0
Income tax (expense) benefit	(21,275)	(18,105)
Other comprehensive income (loss) on investment securities available for sale	34,477	29,313
Defined benefit pension and postretirement obligations:
Prior service cost, net of amortization	13	13
Amortization of actuarial losses	482	532
Income tax (expense) benefit	(189)	(208)
Other comprehensive income (loss) on pension and postretirement obligations	306	337
Comprehensive income	77,317	76,322
Total other comprehensive income (loss)	$ 34,783	$ 29,650

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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Preferred Equity [Member]	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Beginning balance at Dec. 31, 2014	$ 2,800,251	$ 59,727	$ 1,665	$ 1,484,933	$ 1,497,818	$ (4,850)	$ (239,042)
Comprehensive income:
Net income	46,672	0	0	0	46,672	0	0
Other comprehensive income	29,650	0	0	0	0	29,650	0
Comprehensive income	76,322
Common stock issued:
Stock-based compensation plans, net	6,236	0	0	304	(18,015)	0	23,947
Acquisition of Ahmann & Martin Co.	43,530	0	26	43,504	0	0	0
Purchase of treasury stock	(4,105)	0	0	0	0	0	(4,105)
Cash dividends:
Common stock dividends ($0.10 per share in 2015 and $0.11 per share in 2016)	(15,280)	0	0	0	(15,280)	0	0
Preferred stock dividends	(1,228)	0	0	0	(1,228)	0	0
Stock-based compensation expense, net	5,774	0	0	5,774	0	0	0
Tax impact of stock-based compensation	638	0	0	638	0	0	0
Purchase of common stock returned to authorized but unissued	(30,000)	0	(17)	(29,983)	0	0	0
Ending balance at Mar. 31, 2015	2,882,138	59,727	1,674	1,505,170	1,509,967	24,800	(219,200)
Beginning balance at Dec. 31, 2015	2,937,246	121,379	1,642	1,458,522	1,593,239	(32,616)	(204,920)
Comprehensive income:
Net income	42,534	0	0	0	42,534	0	0
Other comprehensive income	34,783	0	0	0	0	34,783	0
Comprehensive income	77,317
Common stock issued:
Stock-based compensation plans, net	2,205	0	0	613	(17,271)	0	18,863
Purchase of treasury stock	(2,792)	0	0	0	0	0	(2,792)
Cash dividends:
Common stock dividends ($0.10 per share in 2015 and $0.11 per share in 2016)	(16,409)	0	0	0	(16,409)	0	0
Preferred stock dividends	(2,198)	0	0	0	(2,198)	0	0
Purchase of preferred stock	(1,092)	(1,032)	0	0	(60)	0	0
Stock-based compensation expense, net	8,066	0	0	8,066	0	0	0
Tax impact of stock-based compensation	162	0	0	162	0	0	0
Purchase of common stock returned to authorized but unissued	(20,007)	0	(12)	(19,995)	0	0	0
Ending balance at Mar. 31, 2016	$ 2,982,498	$ 120,347	$ 1,630	$ 1,447,368	$ 1,599,835	$ 2,167	$ (188,849)

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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Common Stock [Member]
Cash dividends:
Common stock, per share	$ 0.11	$ 0.10

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 42,534	$ 46,672
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	20,000	4,500
Depreciation and amortization	11,060	12,268
(Recovery of) addition to valuation allowance on mortgage servicing rights, net	909	243
Amortization of mortgage servicing rights	2,874	3,179
Amortization of other intangible assets	504	801
Amortization and accretion on earning assets, funding, and other, net	10,692	9,863
Tax impact of stock based compensation	162	638
Gain on sales of investment securities, net	(3,098)	0
Gain on sales of assets and impairment write-downs, net	(524)	(833)
Gain on mortgage banking activities, net	(3,106)	(3,141)
Mortgage loans originated and acquired for sale	(193,849)	(268,296)
Proceeds from sales of mortgage loans held for sale	221,764	238,399
(Increase) decrease in interest receivable	(5,180)	(2,186)
Increase (decrease) in interest payable	(6,121)	(948)
Commercial loans held for sale	(30,089)	0
Other, net	(46,160)	(29,848)
Net cash provided by operating activities	22,372	11,311
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in loans	(531,891)	(368,794)
Purchases of:
Available for sale securities	(182,895)	(202,615)
Held to maturity securities	(28,570)	(36,788)
Federal Home Loan Bank and Federal Reserve Bank stocks	(34,613)	(115)
Premises, equipment, and software, net of disposals	(70,685)	(13,944)
Other assets	(1,226)	(1,207)
Proceeds from:
Sales of available for sale securities	119,379	289
Prepayments, calls, and maturities of available for sale investment securities	180,458	282,835
Prepayments, calls, and maturities of held to maturity investment securities	15,029	5,155
Sales, prepayments, calls, and maturities of other assets	9,566	0
Net cash (paid) received in acquisition	(685)	1,202
Net cash used in investing activities	(526,133)	(333,982)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in deposits	(322,205)	1,088,088
Net increase (decrease) in short-term funding	582,992	(405,751)
Repayment of long-term funding	(430,010)	(500,009)
Proceeds from issuance of long-term funding	615,000	0
Proceeds from issuance of common stock for stock-based compensation plans	2,205	6,236
Purchase of preferred stock	(1,092)	0
Purchase of common stock returned to authorized but unissued	(20,007)	(30,000)
Purchase of treasury stock	(2,792)	(4,105)
Cash dividends on common stock	(16,409)	(15,280)
Cash dividends on preferred stock	(2,198)	(1,228)
Net cash provided by financing activities	405,484	137,951
Net increase (decrease) in cash and cash equivalents	(98,277)	(184,720)
Cash and cash equivalents at beginning of period	473,685	1,032,067	$ 1,032,067
Cash and cash equivalents at end of period	375,408	847,347	$ 473,685
Supplemental disclosures of cash flow information:
Cash paid for interest	28,041	19,643
Cash paid for income taxes	1,167	0
Loans and bank premises transferred to other real estate owned	3,160	2,104
Capitalized mortgage servicing rights	1,856	3,010
Fair value of assets acquired, including cash and cash equivalents	522	5,160
Fair value ascribed to goodwill and intangible assets	4,119	51,221
Fair value of liabilities assumed	1,423	12,851
Common stock issued in acquisition	$ 0	$ 43,530

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Basis of Presentation

3 Months Ended

Mar. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly the financial position, results of operations and comprehensive income, changes in stockholders’ equity, and cash flows of Associated Banc-Corp (individually referred to herein as the “Parent Company,” and together with all of its subsidiaries and affiliates, collectively referred to herein as the “Corporation”) for the periods presented, and all such adjustments are of a normal recurring nature. The consolidated financial statements include the accounts of all subsidiaries. All significant intercompany transactions and balances have been eliminated in consolidation. The results of operations for the interim periods are not necessarily indicative of the results to be expected for the full year.

In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and revenues and expenses for the period. Actual results could differ significantly from those estimates. Estimates that are particularly susceptible to significant change include the determination of the allowance for loan losses, goodwill impairment assessment, mortgage servicing rights valuation, and income taxes. Management has evaluated subsequent events for potential recognition or disclosure.

During the first quarter of 2016, the consolidated statements of income were modified from prior periods' presentation to conform with the current period presentation, which reflects OREO gains / losses as a component of Foreclosure / OREO expense, net. In prior periods' presentation, OREO gains/losses were reported as a component of asset gains (losses), net. All prior periods have been restated to reflect this change.

During the first quarter of 2016, the Corporation combined the lease financing portfolio with the commercial and industrial portfolio for disclosure purposes. All prior periods have been restated to reflect this change in presentation.

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Acquisitions

3 Months Ended

Mar. 31, 2016

Business Combinations [Abstract]

Acquisitions

Acquisitions

On February 17, 2015, the Corporation acquired Ahmann & Martin Co., a risk and employee benefits consulting firm based in Minnesota. The firm merged into Associated Financial Group, LLC, the Corporation's insurance brokerage subsidiary. The Corporation's acquisition of Ahmann & Martin Co. enhances the Corporation's ability to offer clients unique, comprehensive solutions to meet their insurance and financial risk management needs. The transaction was valued at approximately $48 million with the opportunity to increase the consideration by $8 million should certain contingencies be met over a defined period.

The transaction was accounted for using the acquisition method of accounting and as such, assets acquired, liabilities assumed and consideration exchanged were recorded at their estimated fair value on the acquisition date. Goodwill from the acquisition represents the excess of the purchase price over the fair value of the net tangible and intangible assets acquired and is not deductible for tax purposes. As a result of the acquisition, the Corporation recorded goodwill of approximately $40 million and other intangible assets of approximately $12 million. Goodwill was assigned to the Corporation's Community, Consumer, and Business segment. See Note 8 for additional information on goodwill and other intangible assets.

During the first quarter of 2016, the Corporation completed two small insurance acquisitions to complement its existing insurance and benefits related products and services provided by Associated Financial Group, LLC. The Corporation recorded goodwill of $3 million and other intangibles of $1 million related to these insurance acquisitions.

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New Accounting Pronouncements Adopted

3 Months Ended

Mar. 31, 2016

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

New Accounting Pronouncements Adopted

New Accounting Pronouncements Adopted

In September 2015, the FASB issued an amendment to simplify the accounting for measurement adjustments to prior business combinations. The amendment requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The acquirer must record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. The amendment also requires an entity to present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. This amendment was effective for fiscal years beginning after December 15, 2015, including interim periods within those fiscal years. The Corporation adopted the accounting standard during the first quarter of 2016, as required, and with no material impact on its results of operations, financial position, or liquidity.

In May 2015, the FASB issued an amendment to eliminate the requirement to categorize investments measured using the net asset value per share ("NAV") practical expedient in the fair value hierarchy table. Entities will be required to disclose the fair value of investments measured using the NAV practical expedient so that financial statement users can reconcile amounts reported in the fair value hierarchy table to amounts reported on the balance sheet. The Corporation adopted the accounting standard during the first quarter of 2016, as required, with no material impact on its results of operations, financial position, or liquidity.

In April 2015, the FASB issued an amendment to provide guidance to customers about whether a cloud computing arrangement included a software license. If the cloud computing arrangement includes a software license, then the customer should account for the software license element consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. This amendment was effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2015. The Corporation adopted the accounting standard on a prospective basis during the first quarter of 2016, as required, and with no material impact on its results of operations, financial position, or liquidity.

In April 2015, the FASB issued an amendment to simplify the presentation of debt issuance costs. This amendment requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. In August 2015, the FASB expanded this amendment to include SEC staff views related to debt issuance costs associated with line-of-credit arrangements. The SEC staff would not object to an entity deferring and presenting debt issuance costs as an asset and subsequently amortizing the deferred debt issuance costs over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. This amendment required retrospective application and was effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The Corporation adopted the accounting standard during the first quarter of 2016. All prior periods have been restated to reflect this change in presentation, resulting in a $3 million reduction to other assets and a corresponding $3 million reduction to long-term funding on the balance sheet compared to the amounts originally reported at December 31, 2015. See "Consolidated Balance Sheets" and Note 9 for additional information on the reclassification of debt issuance costs.

In February 2015, the FASB issued an amendment to modify existing consolidation guidance for reporting companies that are required to evaluate whether they should consolidate legal entities. The new standard will place more emphasis on risk of loss when determining a controlling financial interest. Frequency in the application of related-party guidance for determining a controlling financial interest will be reduced. Also, consolidation conclusions for public and private companies among several industries that make use of limited partnerships or VIEs will be changed. This amendment was effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The Corporation adopted the accounting standard during the first quarter of 2016, as required, and with no material impact on its results of operations, financial position, or liquidity.

In January 2015, the FASB issued an amendment to eliminate from U.S. GAAP the concept of extraordinary items. Presently, an event or transaction is presumed to be an ordinary and usual activity of the reporting entity unless evidence clearly supports its classification as an extraordinary item. If an event or transaction meets the criteria for extraordinary classification, an entity is required to segregate the extraordinary item from the results of ordinary operations and show the item separately in the income statement, net of tax, after income from continuing operations. This amended guidance will prohibit separate disclosure of extraordinary items in the income statement. This amendment was effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The Corporation adopted the accounting standard during the first quarter of 2016, as required, with no material impact.

In June 2014, the FASB issued an amendment to the stock compensation accounting guidance to clarify that a performance target that affects vesting of a share-based payment and that could be achieved after the requisite service period be treated as a performance condition. As such, the performance target should not be reflected in estimating the grant-date fair value of the award. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the period(s) for which the requisite service has already been rendered. This amendment was effective for annual reporting periods, including interim periods within those annual periods, beginning after December 15, 2015. The Corporation adopted the accounting standard on a prospective basis during the first quarter of 2016, as required, with no material impact on its results of operations, financial position, or liquidity.

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Earnings Per Common Share

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Earnings Per Common Share

Earnings Per Common Share

Earnings per common share are calculated utilizing the two-class method. Basic earnings per common share are calculated by dividing the sum of distributed earnings to common shareholders and undistributed earnings allocated to common shareholders by the weighted average number of common shares outstanding. Diluted earnings per common share are calculated by dividing the sum of distributed earnings to common shareholders and undistributed earnings allocated to common shareholders by the weighted average number of common shares outstanding adjusted for the dilutive effect of common stock awards (outstanding stock options, unvested restricted stock awards, and outstanding common stock warrants). Presented below are the calculations for basic and diluted earnings per common share.

	For the Three Months Ended March 31,
	2016			2015
	(In thousands, except per share data)
Net income	$	42,534		$	46,672
Preferred stock dividends	(2,198		)	(1,228		)
Net income available to common equity	$	40,336		$	45,444
Common shareholder dividends	(16,203		)	(15,166		)
Unvested share-based payment awards	(206		)	(114		)
Undistributed earnings	$	23,927		$	30,164
Undistributed earnings allocated to common shareholders	23,686			29,886
Undistributed earnings allocated to unvested share-based payment awards	241			278
Undistributed earnings	$	23,927		$	30,164
Basic
Distributed earnings to common shareholders	$	16,203		$	15,166
Undistributed earnings allocated to common shareholders	23,686			29,886
Total common shareholders earnings, basic	$	39,889		$	45,052
Diluted
Distributed earnings to common shareholders	$	16,203		$	15,166
Undistributed earnings allocated to common shareholders	23,686			29,886
Total common shareholders earnings, diluted	$	39,889		$	45,052
Weighted average common shares outstanding	148,601			150,070
Effect of dilutive common stock awards	853			1,094
Diluted weighted average common shares outstanding	149,454			151,164
Basic earnings per common share	$	0.27		$	0.30
Diluted earnings per common share	$	0.27		$	0.30

Options to purchase approximately 3 million and 2 million shares were outstanding for the three months ended March 31, 2016 and 2015, respectively, but excluded from the calculation of diluted earnings per common share as the effect would have been anti-dilutive. Warrants to purchase approximately 4 million shares were outstanding for both three months ended March 31, 2016 and 2015, but excluded from the calculation of diluted earnings per common shares as the effect would have been anti-dilutive.

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Stock-Based Compensation

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Stock-Based Compensation

Stock-Based Compensation

Stock-Based Compensation Plan:

In March 2013, the Board of Directors, with subsequent approval of the Corporation’s shareholders, approved the adoption of the 2013 Incentive Compensation Plan (“2013 Plan”). Under the 2013 Plan, options are generally exercisable up to 10 years from the date of grant, have an exercise price that is equal to the closing price of the Corporation’s stock on the grant date, and vest ratably over four years, while service-based restricted stock awards vest ratably over four years and performance-based restricted stock awards vest over the three year performance period.

The Corporation issues restricted common stock and restricted common stock units to certain key employees (collectively referred to as “restricted stock awards”) under this plan. The shares of restricted stock are restricted as to transfer, but are not restricted as to dividend payment or voting rights. Restricted stock units receive dividend equivalents but do not have voting rights. The transfer restrictions lapse over three or four years, depending upon whether the awards are service-based or performance-based. Service-based awards are contingent upon continued employment or meeting the requirements for retirement, and performance-based awards are based on earnings per share performance goals, relative total shareholder return, and continued employment or meeting the requirements for retirement. The plan provides that restricted stock awards and stock options will immediately become fully vested upon retirement from the Corporation of those colleagues whose retirement meets the early retirement or normal retirement definitions under the plan (“retirement eligible colleagues”).

Accounting for Stock-Based Compensation:

The fair value of stock options granted is estimated on the date of grant using a Black-Scholes option pricing model, while the fair value of restricted stock awards is their fair market value on the date of grant. The fair values of stock options and restricted stock awards are amortized as compensation expense on a straight-line basis over the vesting period of the grants. For retirement eligible colleagues, expenses related to stock options and restricted stock awards are fully recognized on the date the colleague meets the definition of normal or early retirement. Compensation expense recognized is included in personnel expense in the consolidated statements of income.

Assumptions are used in estimating the fair value of stock options granted. The weighted average expected life of the stock option represents the period of time that stock options are expected to be outstanding and is estimated using historical data of stock option exercises and forfeitures. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. The expected volatility is based on the implied volatility of the Corporation’s stock. The following assumptions were used in estimating the fair value for options granted in the first three months of 2016 and full year 2015.

	2016		2015
Dividend yield	2.50	%	2.00	%
Risk-free interest rate	2.00	%	2.00	%
Weighted average expected volatility	25.00	%	20.00	%
Weighted average expected life	5.5 years		6.0 years
Weighted average per share fair value of options	$3.36		$3.08

The Corporation is required to estimate potential forfeitures of stock grants and adjust compensation expense recorded accordingly. The estimate of forfeitures will be adjusted over the requisite service period to the extent that actual forfeitures differ, or are expected to differ, from such estimates. Changes in estimated forfeitures will be recognized in the period of change and will also impact the amount of stock-based compensation expense to be recognized in future periods.

A summary of the Corporation’s stock option activity for the year ended December 31, 2015, and the three month ended March 31, 2016 is presented below.

Stock Options	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value (000s)
Outstanding at December 31, 2014	7,847,338		$	18.34
Granted	1,348,504		17.95
Exercised	(1,351,646	)	13.90
Forfeited or expired	(1,215,053	)	29.13
Outstanding at December 31, 2015	6,629,143		$	17.22	6.24	$	18,730
Options Exercisable at December 31, 2015	4,190,245		$	17.25	4.93	$	14,873
Granted	1,302,298		$	17.45
Exercised	(96,602	)	13.60
Forfeited or expired	(48,190	)	17.75
Outstanding at March 31, 2016	7,786,649		$	17.30	6.61	$	14,682
Options Exercisable at March 31, 2016	4,907,257		$	17.22	5.18	$	12,950

The following table summarizes information about the Corporation’s nonvested stock option activity for the year ended December 31, 2015, and for the three months ended March 31, 2016.

Nonvested Stock Options	Shares		Weighted Average Grant Date Fair Value
Nonvested at December 31, 2014	2,770,662		$	3.74
Granted	1,348,504		3.08
Vested	(1,459,709	)	4.19
Forfeited	(220,559	)	3.28
Nonvested at December 31, 2015	2,438,898		$	3.15
Granted	1,302,298		3.36
Vested	(813,614	)	3.25
Forfeited	(48,190	)	3.20
Nonvested at March 31, 2016	2,879,392		$	3.21

Intrinsic value represents the amount by which the fair market value of the underlying stock exceeds the exercise price of the stock option. For the three months ended March 31, 2016, the intrinsic value of stock options exercised was approximately $420,000. For the year ended December 31, 2015 the intrinsic value of the stock options exercised was $7 million. The total fair value of stock options that vested were $3 million and $6 million, respectively, for the three months ended March 31, 2016 and for the year ended December 31, 2015. The Corporation recognized compensation expense for the vesting of stock options of over $1 million and $4 million for the three month ended March 31, 2016 and year ended December 31, 2015, respectively. Included in compensation expense for 2016 was approximately $857,000 of expense for the accelerated vesting of stock options granted to retirement eligible colleagues. At March 31, 2016, the Corporation had $8 million of unrecognized compensation expense related to stock options that is expected to be recognized over the remaining requisite service periods that extend predominantly through the fourth quarter 2019.

The following table summarizes information about the Corporation’s restricted stock activity for the year ended December 31, 2015, and for the three months ended March 31, 2016.

Restricted Stock	Shares		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2014	1,982,126		$	15.79
Granted	1,173,847		18.09
Vested	(709,582	)	15.62
Forfeited	(196,363	)	16.87
Outstanding at December 31, 2015	2,250,028		$	17.03
Granted	1,041,985		16.37
Vested	(732,553	)	16.46
Forfeited	(34,299	)	17.69
Outstanding at March 31, 2016	2,525,161		$	16.91

The Corporation amortizes the expense related to restricted stock awards as compensation expense over the vesting period specified in the grant. Performance-based restricted stock awards granted during 2015 and 2016 will vest ratably over a three year period, while service-based restricted stock awards granted during 2015 and 2016 will vest ratably over a four year period. Expense for restricted stock awards of approximately $7 million and $15 million was recorded for the three months ended March 31, 2016 and year ended December 31, 2015, respectively. Included in compensation expense for 2016 was approximately $2 million of expense for the accelerated vesting of restricted stock awards granted to retirement eligible colleagues. The Corporation had $33 million of unrecognized compensation costs related to restricted stock awards at March 31, 2016, that is expected to be recognized over the remaining requisite service periods that extend predominantly through fourth quarter 2019.

The Corporation has the ability to issue shares from treasury or new shares upon the exercise of stock options or the granting of restricted stock awards. The Board of Directors has authorized management to repurchase shares of the Corporation’s common stock each quarter in the market, to be made available for issuance in connection with the Corporation’s employee incentive plans and for other corporate purposes. The repurchase of shares will be based on market and investment opportunities, capital levels, growth prospects, and regulatory constraints. Such repurchases may occur from time to time in open market purchases, block transactions, private transactions, accelerated share repurchase programs, or similar facilities.

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Investment Securities

3 Months Ended

Mar. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Investment Securities

Investment Securities

Investment securities are generally classified as available for sale or held to maturity at the time of purchase. The majority of the Corporation's investment securities are mortgage-related securities issued by the Government National Mortgage Association (“GNMA”) or government-sponsored enterprises ("GSE") such as the Federal National Mortgage Association (“FNMA”) and the Federal Home Loan Mortgage Corporation (“FHLMC”). The amortized cost and fair values of securities available for sale and held to maturity were as follows.

March 31, 2016	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
U. S. Treasury securities	$	1,000	$	—	$	—		$	1,000
Residential mortgage-related securities:
FNMA / FHLMC	1,268,929		35,321		(846		)	1,303,404
GNMA	1,536,248		11,086		(79		)	1,547,255
Private-label	1,535		—		(23		)	1,512
GNMA commercial mortgage-related securities	2,053,540		5,855		(11,530		)	2,047,865
Other securities (debt and equity)	4,718		87		—			4,805
Total investment securities available for sale	$	4,865,970	$	52,349	$	(12,478	)	$	4,905,841
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	$	1,054,757	$	25,972	$	(146	)	$	1,080,583
Residential mortgage-related securities:
FNMA / FHLMC	40,404		797		(180		)	41,021
GNMA	81,660		1,086		(5		)	82,741
Total investment securities held to maturity	$	1,176,821	$	27,855	$	(331	)	$	1,204,345

December 31, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
U. S. Treasury securities	$	999	$	—	$	(2	)	$	997
Residential mortgage-related securities:
FNMA / FHLMC	1,388,995		33,791		(8,160		)	1,414,626
GNMA	1,605,956		507		(16,460		)	1,590,003
Private-label	1,722		1		(14		)	1,709
GNMA commercial mortgage-related securities	1,982,477		1,334		(28,501		)	1,955,310
Other securities (debt and equity)	4,718		51		—			4,769
Total investment securities available for sale	$	4,984,867	$	35,684	$	(53,137	)	$	4,967,414
Investment securities held to maturity:
Municipal securities	$	1,043,767	$	16,803	$	(339	)	$	1,060,231
Residential mortgage-related securities:
FNMA / FHLMC	41,469		513		(645		)	41,337
GNMA	82,994		189		(309		)	82,874
Total investment securities held to maturity	$	1,168,230	$	17,505	$	(1,293	)	$	1,184,442

The amortized cost and fair values of investment securities available for sale and held to maturity at March 31, 2016, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Available for Sale					Held to Maturity
($ in Thousands)	Amortized Cost		Fair Value			Amortized Cost		Fair Value
Due in one year or less	$	2,500	$	2,530		$	46,749	$	32,151
Due after one year through five years	3,200		3,200			243,423		255,338
Due after five years through ten years	—		—			245,683		255,755
Due after ten years	—		—			518,902		537,339
Total debt securities	5,700		5,730			1,054,757		1,080,583
Residential mortgage-related securities:
FNMA / FHLMC	1,268,929		1,303,404			40,404		41,021
GNMA	1,536,248		1,547,255			81,660		82,741
Private-label	1,535		1,512			—		—
GNMA commercial mortgage-related securities	2,053,540		2,047,865			—		—
Equity securities	18		75			—		—
Total investment securities	$	4,865,970	$	4,905,841		$	1,176,821	$	1,204,345
Ratio of Fair Value to Amortized Cost			100.8		%			102.3		%

During the first three months of 2016, the Corporation continued to restructure its investment securities portfolio and sold approximately $119 million of FNMA and FHLMC mortgage-related securities and reinvested into GNMA mortgage-related securities, generating a $3 million net gain on sale. This restructuring lowered risk weighted assets and related capital requirements.

	Three Months Ended March 31,
	2016			2015
	($ in Thousands)
Gross gains	$	3,287		$	—
Gross losses	(189		)	—
Investment securities gains, net	$	3,098		$	—
Proceeds from sales of investment securities	$	119,379		$	289

Pledged securities with a carrying value of approximately $2.7 billion and $3.2 billion at March 31, 2016, and December 31, 2015, respectively, were pledged to secure certain deposits or for other purposes as required or permitted by law.

The following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at March 31, 2016.

	Less than 12 months						12 months or more						Total
March 31, 2016	Number of Securities	Unrealized Losses			Fair Value		Number of Securities	Unrealized Losses			Fair Value		Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
Residential mortgage-related securities:
FNMA / FHLMC	—	$	—		$	—	12	$	(846	)	$	258,670	$	(846	)	$	258,670
GNMA	2	(79		)	41,913		—	—			—		(79		)	41,913
Private-label	1	(1		)	76		3	(22		)	1,382		(23		)	1,458
GNMA commercial mortgage-related securities	20	(1,390		)	558,620		21	(10,140		)	448,861		(11,530		)	1,007,481
Total	23	$	(1,470	)	$	600,609	36	$	(11,008	)	$	708,913	$	(12,478	)	$	1,309,522
Investment securities held to maturity:
Municipal securities	20	$	(75	)	$	10,029	17	$	(71	)	$	5,599	$	(146	)	$	15,628
Residential mortgage-related securities:
FNMA / FHLMC	1	(3		)	1,180		5	(177		)	13,587		(180		)	14,767
GNMA	—	—			—		1	(5		)	1,548		(5		)	1,548
Total	21	$	(78	)	$	11,209	23	$	(253	)	$	20,734	$	(331	)	$	31,943

For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2015.

	Less than 12 months						12 months or more						Total
December 31, 2015	Number of Securities	Unrealized Losses			Fair Value		Number of Securities	Unrealized Losses			Fair Value		Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
U.S. Treasury securities	1	$	(2	)	$	997	—	$	—		$	—	$	(2	)	$	997
Residential mortgage-related securities:
FNMA / FHLMC	17	(1,548		)	220,852		14	(6,612		)	338,186		(8,160		)	559,038
GNMA	46	(16,460		)	1,434,484		—	—			—		(16,460		)	1,434,484
Private-label	1	(1		)	83		3	(13		)	1,565		(14		)	1,648
GNMA commercial mortgage-related securities	40	(9,610		)	1,132,844		21	(18,891		)	448,218		(28,501		)	1,581,062
Total	105	$	(27,621	)	$	2,789,260	38	$	(25,516	)	$	787,969	$	(53,137	)	$	3,577,229
Investment securities held to maturity:
Municipal securities	53	$	(146	)	$	23,137	24	$	(193	)	$	9,254	$	(339	)	$	32,391
Residential mortgage-related securities:
FNMA / FHLMC	10	(177		)	12,754		3	(468		)	11,106		(645		)	23,860
GNMA	21	(201		)	45,499		3	(108		)	6,797		(309		)	52,296
Total	84	$	(524	)	$	81,390	30	$	(769	)	$	27,157	$	(1,293	)	$	108,547

The Corporation reviews the investment securities portfolio on a quarterly basis to monitor its exposure to other-than-temporary impairment. A determination as to whether a security’s decline in fair value is other-than-temporary takes into consideration numerous factors and the relative significance of any single factor can vary by security. Some factors the Corporation may consider in the other-than-temporary impairment analysis include, the length of time and extent to which the security has been in an unrealized loss position, changes in security ratings, financial condition and near-term prospects of the issuer, as well as security and industry specific economic conditions.

Based on the Corporation’s evaluation, management does not believe any unrealized loss at March 31, 2016, represents an other-than-temporary impairment as these unrealized losses are primarily attributable to changes in interest rates and the current market conditions, and not credit deterioration. The unrealized losses reported for municipal securities relate to various state and local political subdivisions and school districts. The Corporation currently does not intend to sell nor does it believe that it will be required to sell the securities contained in the above unrealized losses table before recovery of their amortized cost basis. The reduction in unrealized losses at March 31, 2016 is due to the reduction in overall interest rates.  The U.S. Treasury 3-year and 5-year rates dropped by 44 basis points ("bp") and 55 bp, respectively, from December 31, 2015.

Federal Home Loan Bank (“FHLB”) and Federal Reserve Bank Stocks: The Corporation is required to maintain Federal Reserve stock and FHLB stock as a member of both the Federal Reserve System and the FHLB, and in amounts as required by these institutions. These equity securities are “restricted” in that they can only be sold back to the respective institutions or another member institution at par. Therefore, they are less liquid than other marketable equity securities and their fair value is equal to amortized cost. At March 31, 2016, and December 31, 2015, the Corporation had FHLB stock of $108 million and $74 million, respectively, reflecting the overall increase in FHLB short-term and long-term funding. The Corporation had Federal Reserve Bank stock of $73 million at both March 31, 2016 and December 31, 2015, respectively.

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Loans

3 Months Ended

Mar. 31, 2016

Receivables [Abstract]

Loans

Loans

The period end loan composition was as follows.

	March 31, 2016		December 31, 2015
	($ in Thousands)
Commercial and industrial	$	6,511,648	$	6,190,683
Commercial real estate — owner occupied	917,285		918,212
Commercial and business lending	7,428,933		7,108,895
Commercial real estate — investor	3,276,733		3,234,266
Real estate construction	1,184,398		1,162,145
Commercial real estate lending	4,461,131		4,396,411
Total commercial	11,890,064		11,505,306
Residential mortgage	5,944,457		5,783,267
Home equity	982,994		1,005,802
Other consumer	409,725		419,968
Total consumer	7,337,176		7,209,037
Total loans	$	19,227,240	$	18,714,343

The following table presents commercial and consumer loans by credit quality indicator at March 31, 2016.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	5,713,979	$	272,090	$	328,464	$	197,115	$	6,511,648
Commercial real estate - owner occupied	834,879		31,856		41,107		9,443		917,285
Commercial and business lending	6,548,858		303,946		369,571		206,558		7,428,933
Commercial real estate - investor	3,208,338		30,680		25,385		12,330		3,276,733
Real estate construction	1,180,914		222		2,422		840		1,184,398
Commercial real estate lending	4,389,252		30,902		27,807		13,170		4,461,131
Total commercial	10,938,110		334,848		397,378		219,728		11,890,064
Residential mortgage	5,883,743		5,014		3,488		52,212		5,944,457
Home equity	967,267		1,446		209		14,072		982,994
Other consumer	408,819		523		—		383		409,725
Total consumer	7,259,829		6,983		3,697		66,667		7,337,176
Total	$	18,197,939	$	341,831	$	401,075	$	286,395	$	19,227,240

The following table presents commercial and consumer loans by credit quality indicator at December 31, 2015.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	5,522,809	$	341,169	$	233,130	$	93,575	$	6,190,683
Commercial real estate - owner occupied	835,572		38,885		35,706		8,049		918,212
Commercial and business lending	6,358,381		380,054		268,836		101,624		7,108,895
Commercial real estate - investor	3,153,703		45,976		25,944		8,643		3,234,266
Real estate construction	1,157,034		252		3,919		940		1,162,145
Commercial real estate lending	4,310,737		46,228		29,863		9,583		4,396,411
Total commercial	10,669,118		426,282		298,699		111,207		11,505,306
Residential mortgage	5,727,437		1,552		2,796		51,482		5,783,267
Home equity	988,574		1,762		222		15,244		1,005,802
Other consumer	419,087		556		—		325		419,968
Total consumer	7,135,098		3,870		3,018		67,051		7,209,037
Total	$	17,804,216	$	430,152	$	301,717	$	178,258	$	18,714,343

Factors that are important to managing overall credit quality are sound loan underwriting and administration, systematic monitoring of existing loans and commitments, effective loan review on an ongoing basis, early identification of potential problems, and appropriate allowance for loan losses, allowance for unfunded commitments, nonaccrual, and charge off policies.

For commercial loans, management has determined the pass credit quality indicator to include credits that exhibit acceptable financial statements, cash flow, and leverage. If any risk exists, it is mitigated by the loan structure, collateral, monitoring, or control. For consumer loans, performing loans include credits that are performing in accordance with the original contractual terms. Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Special mention credits have potential weaknesses that deserve management’s attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the credit. Potential problem loans are considered inadequately protected by the current net worth and paying capacity of the obligor or the collateral pledged. These loans generally have a well-defined weakness, or weaknesses, that may jeopardize liquidation of the debt and are characterized by the distinct possibility that the Corporation will sustain some loss if the deficiencies are not corrected. Lastly, management considers a loan to be impaired when it is probable that the Corporation will be unable to collect all amounts due according to the original contractual terms of the note agreement, including both principal and interest. Management has determined that commercial and consumer loan relationships that have nonaccrual status or have had their terms restructured in a troubled debt restructuring meet this impaired loan definition. Commercial loans classified as special mention, potential problem, and nonaccrual loans are reviewed at a minimum on a quarterly basis, while pass and performing rated credits are reviewed on an annual basis or more frequently if the loan renewal is less than one year or if otherwise warranted.

The following table presents loans by past due status at March 31, 2016.

	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due (a)		Nonaccrual (b)		Total
	($ in Thousands)
Commercial and industrial	$	6,311,415	$	2,665	$	236	$	217	$	197,115	$	6,511,648
Commercial real estate - owner occupied	907,322		520		—		—		9,443		917,285
Commercial and business lending	7,218,737		3,185		236		217		206,558		7,428,933
Commercial real estate - investor	3,263,331		748		324		—		12,330		3,276,733
Real estate construction	1,183,143		415		—		—		840		1,184,398
Commercial real estate lending	4,446,474		1,163		324		—		13,170		4,461,131
Total commercial	11,665,211		4,348		560		217		219,728		11,890,064
Residential mortgage	5,888,651		3,199		395		—		52,212		5,944,457
Home equity	963,118		4,410		1,394		—		14,072		982,994
Other consumer	406,248		1,020		662		1,412		383		409,725
Total consumer	7,258,017		8,629		2,451		1,412		66,667		7,337,176
Total	$	18,923,228	$	12,977	$	3,011	$	1,629	$	286,395	$	19,227,240

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at March 31, 2016 (the same as the reported balances for the accruing loans noted above).

(b) Of the total nonaccrual loans,$230 million or 80% were current with respect to payment at March 31, 2016.

The following table presents loans by past due status at December 31, 2015.

	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due (a)		Nonaccrual (b)		Total
	($ in Thousands)
Commercial and industrial	$	6,095,848	$	602	$	409	$	249	$	93,575	$	6,190,683
Commercial real estate - owner occupied	903,021		7,142		—		—		8,049		918,212
Commercial and business lending	6,998,869		7,744		409		249		101,624		7,108,895
Commercial real estate - investor	3,225,332		291		—		—		8,643		3,234,266
Real estate construction	1,160,909		270		26		—		940		1,162,145
Commercial real estate lending	4,386,241		561		26		—		9,583		4,396,411
Total commercial	11,385,110		8,305		435		249		111,207		11,505,306
Residential mortgage	5,726,855		4,491		439		—		51,482		5,783,267
Home equity	982,639		6,190		1,729		—		15,244		1,005,802
Other consumer	416,374		1,195		675		1,399		325		419,968
Total consumer	7,125,868		11,876		2,843		1,399		67,051		7,209,037
Total	$	18,510,978	$	20,181	$	3,278	$	1,648	$	178,258	$	18,714,343

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2015 (the same as the reported balances for the accruing loans noted above).

(b) Of the total nonaccrual loans,$124 million or 69% were current with respect to payment at December 31, 2015.

The following table presents impaired loans at March 31, 2016.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	105,780	$	106,837	$	14,595	$	106,280	$	613
Commercial real estate — owner occupied	10,477		10,596		554		10,552		89
Commercial and business lending	116,257		117,433		15,149		116,832		702
Commercial real estate — investor	23,494		24,430		1,244		23,541		461
Real estate construction	1,226		1,812		412		1,237		14
Commercial real estate lending	24,720		26,242		1,656		24,778		475
Total commercial	140,977		143,675		16,805		141,610		1,177
Residential mortgage	65,281		70,624		12,351		65,819		548
Home equity	20,337		22,451		9,732		20,504		248
Other consumer	1,276		1,332		221		1,291		8
Total consumer	86,894		94,407		22,304		87,614		804
Total loans(a)	$	227,871	$	238,082	$	39,109	$	229,224	$	1,981
Loans with no related allowance
Commercial and industrial	$	120,243	$	130,935	$	—	$	120,399	$	91
Commercial real estate — owner occupied	6,659		9,005		—		6,715		—
Commercial and business lending	126,902		139,940		—		127,114		91
Commercial real estate — investor	9,829		9,984		—		9,855		—
Real estate construction	—		—		—		—		—
Commercial real estate lending	9,829		9,984		—		9,855		—
Total commercial	136,731		149,924		—		136,969		91
Residential mortgage	6,738		7,020		—		6,841		35
Home equity	652		652		—		653		10
Other consumer	—		—		—		—		—
Total consumer	7,390		7,672		—		7,494		45
Total loans(a)	$	144,121	$	157,596	$	—	$	144,463	$	136
Total
Commercial and industrial	$	226,023	$	237,772	$	14,595	$	226,679	$	704
Commercial real estate — owner occupied	17,136		19,601		554		17,267		89
Commercial and business lending	243,159		257,373		15,149		243,946		793
Commercial real estate — investor	33,323		34,414		1,244		33,396		461
Real estate construction	1,226		1,812		412		1,237		14
Commercial real estate lending	34,549		36,226		1,656		34,633		475
Total commercial	277,708		293,599		16,805		278,579		1,268
Residential mortgage	72,019		77,644		12,351		72,660		583
Home equity	20,989		23,103		9,732		21,157		258
Other consumer	1,276		1,332		221		1,291		8
Total consumer	94,284		102,079		22,304		95,108		849
Total loans(a)	$	371,992	$	395,678	$	39,109	$	373,687	$	2,117

(a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 84% of the unpaid principal balance at March 31, 2016.

The following table presents impaired loans at December 31, 2015.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	57,785	$	59,409	$	8,162	$	46,833	$	855
Commercial real estate — owner occupied	9,705		9,804		448		10,087		412
Commercial and business lending	67,490		69,213		8,610		56,920		1,267
Commercial real estate — investor	27,822		29,444		1,831		28,278		1,914
Real estate construction	1,450		2,154		453		1,667		66
Commercial real estate lending	29,272		31,598		2,284		29,945		1,980
Total commercial	96,762		100,811		10,894		86,865		3,247
Residential mortgage	66,590		71,084		12,462		68,183		2,374
Home equity	21,769		23,989		10,118		22,624		1,147
Other consumer	1,154		1,225		195		1,199		30
Total consumer	89,513		96,298		22,775		92,006		3,551
Total loans(a)	$	186,275	$	197,109	$	33,669	$	178,871	$	6,798
Loans with no related allowance
Commercial and industrial	$	65,083	$	72,259	$	—	$	79,573	$	1,657
Commercial real estate — owner occupied	6,221		6,648		—		6,534		15
Commercial and business lending	71,304		78,907		—		86,107		1,672
Commercial real estate — investor	2,736		2,840		—		2,763		90
Real estate construction	—		—		—		—		—
Commercial real estate lending	2,736		2,840		—		2,763		90
Total commercial	74,040		81,747		—		88,870		1,762
Residential mortgage	4,762		5,033		—		4,726		126
Home equity	544		544		—		544		30
Other consumer	—		—		—		—		—
Total consumer	5,306		5,577		—		5,270		156
Total loans(a)	$	79,346	$	87,324	$	—	$	94,140	$	1,918
Total
Commercial and industrial	$	122,868	$	131,668	$	8,162	$	126,406	$	2,512
Commercial real estate — owner occupied	15,926		16,452		448		16,621		427
Commercial and business lending	138,794		148,120		8,610		143,027		2,939
Commercial real estate — investor	30,558		32,284		1,831		31,041		2,004
Real estate construction	1,450		2,154		453		1,667		66
Commercial real estate lending	32,008		34,438		2,284		32,708		2,070
Total commercial	170,802		182,558		10,894		175,735		5,009
Residential mortgage	71,352		76,117		12,462		72,909		2,500
Home equity	22,313		24,533		10,118		23,168		1,177
Other consumer	1,154		1,225		195		1,199		30
Total consumer	94,819		101,875		22,775		97,276		3,707
Total loans(a)	$	265,621	$	284,433	$	33,669	$	273,011	$	8,716

(a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 82% of the unpaid principal balance at December 31, 2015.

Troubled Debt Restructurings (“Restructured Loans”):

Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. See Note 1 “Summary of Significant Accounting Policies," in the Corporation’s 2015 Annual Report on Form 10-K for the Corporation's accounting policy for troubled debt restructurings. The Corporation had a recorded investment of over $4 million in loans modified in troubled debt restructurings for the three months ended March 31, 2016, of which approximately $470,000 was in accrual status and $4 million was in nonaccrual pending a sustained period of repayment. The following table presents nonaccrual and performing restructured loans by loan portfolio.

	March 31, 2016				December 31, 2015
	Performing Restructured Loans		Nonaccrual Restructured Loans(a)		Performing Restructured Loans		Nonaccrual Restructured Loans(a)
	($ in Thousands)
Commercial and industrial	$	28,908	$	2,711	$	29,293	$	1,714
Commercial real estate — owner occupied	7,693		2,689		7,877		2,703
Commercial real estate — investor	20,993		1,356		21,915		3,936
Real estate construction	386		182		510		177
Residential mortgage	19,807		23,845		19,870		24,592
Home equity	6,917		4,416		7,069		4,522
Other consumer	893		33		829		40
Total	$	85,597	$	35,232	$	87,363	$	37,684

(a) Nonaccrual restructured loans have been included within nonaccrual loans.

The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio during the three months ended March 31, 2016 and 2015, respectively, and the recorded investment and unpaid principal balance as of March 31, 2016 and 2015 respectively.

	Three Months Ended March 31, 2016					Three Months Ended March 31, 2015
	Number of Loans	Recorded Investment(a)		Unpaid Principal Balance(b)		Number of Loans	Recorded Investment(a)		Unpaid Principal Balance(b)
	($ in Thousands)
Commercial and industrial	7	$	1,483	$	1,522	2	$	196	$	208
Commercial real estate — owner occupied	1	125		130		5	3,585		3,641
Commercial real estate — investor	—	—		—		4	3,030		3,042
Real estate construction	1	10		55		—	—		—
Residential mortgage	30	2,062		2,124		30	2,816		2,864
Home equity	20	818		879		36	1,782		1,843
Total	59	$	4,498	$	4,710	77	$	11,409	$	11,598

(a) Represents post-modification outstanding recorded investment.

(b) Represents pre-modification outstanding recorded investment.

Restructured loan modifications may include payment schedule modifications, interest rate concessions, maturity date extensions, modification of note structure (A/B Note), non-reaffirmed Chapter 7 bankruptcies, principal reduction, or some combination of these concessions. During the three months ended March 31, 2016, restructured loan modifications of commercial and industrial, commercial real estate, and real estate construction loans primarily included maturity date extensions and payment schedule modifications. Restructured loan modifications of home equity and residential mortgage loans primarily included maturity date extensions, interest rate concessions, non-reaffirmed Chapter 7 bankruptcies, or a combination of these concessions for the three months ended March 31, 2016.

The following table provides the number of loans modified in a troubled debt restructuring during the previous twelve months which subsequently defaulted during the three months ended March 31, 2016 and 2015, respectively, as well as the recorded investment in these restructured loans as of March 31, 2016 and 2015 respectively.

	Three Months Ended March 31, 2016			Three Month Ended March 31, 2015
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	($ in Thousands)
Commercial real estate — owner occupied	—	$	—	1	$	297
Real estate construction	1	10		—	—
Residential mortgage	7	1,151		16	1,239
Home equity	8	153		24	855
Total	16	$	1,314	41	$	2,391

All loans modified in a troubled debt restructuring are evaluated for impairment. The nature and extent of the impairment of restructured loans, including those which have experienced a subsequent payment default, is considered in the determination of an appropriate level of the allowance for loan losses.

A summary of the changes in the allowance for loan losses by portfolio segment for the three months ended March 31, 2016, was as follows.

$ in Thousands	Commercial and industrial			Commercial real estate - owner occupied			Commercial real estate - investor			Real estate construction			Residential mortgage			Home equity			Other consumer			Total
December 31, 2015	$	129,959		$	18,680		$	43,018		$	25,266		$	28,261		$	23,555		$	5,525		$	274,264
Charge offs	(16,894		)	(76		)	(176		)	(54		)	(1,390		)	(1,746		)	(909		)	(21,245		)
Recoveries	1,958			33			1,415			26			158			600			161			4,351
Net charge offs	(14,936		)	(43		)	1,239			(28		)	(1,232		)	(1,146		)	(748		)	(16,894		)
Provision for loan losses	24,470			(2,059		)	(2,233		)	(3,498		)	2,030			721			569			20,000
March 31, 2016	$	139,493		$	16,578		$	42,024		$	21,740		$	29,059		$	23,130		$	5,346		$	277,370
Allowance for loan losses:
Individually evaluated for impairment	$	14,005		$	74		$	—		$	—		$	14		$	—		$	—		$	14,093
Collectively evaluated for impairment	125,488			16,504			42,024			21,740			29,045			23,130			5,346			263,277
Total allowance for loan losses	$	139,493		$	16,578		$	42,024		$	21,740		$	29,059		$	23,130		$	5,346		$	277,370
Loans:
Individually evaluated for impairment	$	195,341		$	7,500		$	9,829		$	—		$	7,472		$	652		$	—		$	220,794
Collectively evaluated for impairment	6,316,307			909,785			3,266,904			1,184,398			5,936,985			982,342			409,725			19,006,446
Total loans	$	6,511,648		$	917,285		$	3,276,733		$	1,184,398		$	5,944,457		$	982,994		$	409,725		$	19,227,240

The allowance for credit losses is comprised of the allowance for loan losses and the allowance for unfunded commitments. The level of the allowance for loan losses represents management’s estimate of an amount appropriate to provide for probable credit losses in the loan portfolio at the balance sheet date. The allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb estimated probable losses related to unfunded credit facilities (including unfunded loan commitments and letters of credit) and is included in accrued expenses and other liabilities on the consolidated balance sheets. See Note 12 for additional information on the allowance for unfunded commitments.

For comparison purposes, a summary of the changes in the allowance for loan losses by portfolio segment for the year ended December 31, 2015, was as follows.

$ in Thousands	Commercial and industrial			Commercial real estate - owner occupied			Commercial real estate - investor			Real estate construction			Residential mortgage			Home equity			Other consumer			Total
December 31, 2014	$	117,635		$	16,510		$	46,333		$	20,999		$	31,926		$	26,464		$	6,435		$	266,302
Charge offs	(27,687		)	(2,645		)	(4,645		)	(750		)	(5,636		)	(7,048		)	(3,869		)	(52,280		)
Recoveries	9,821			921			4,157			2,268			1,077			3,233			765			22,242
Net charge offs	(17,866		)	(1,724		)	(488		)	1,518			(4,559		)	(3,815		)	(3,104		)	(30,038		)
Provision for loan losses	30,190			3,894			(2,827		)	2,749			894			906			2,194			38,000
December 31, 2015	$	129,959		$	18,680		$	43,018		$	25,266		$	28,261		$	23,555		$	5,525		$	274,264
Allowance for loan losses:
Individually evaluated for impairment	$	7,522		$	—		$	229		$	—		$	166		$	46		$	—		$	7,963
Collectively evaluated for impairment	122,437			18,680			42,789			25,266			28,095			23,509			5,525			266,301
Total allowance for loan losses	$	129,959		$	18,680		$	43,018		$	25,266		$	28,261		$	23,555		$	5,525		$	274,264
Loans:
Individually evaluated for impairment	$	91,569		$	6,221		$	5,460		$	—		$	6,956		$	1,281		$	—		$	111,487
Collectively evaluated for impairment	6,099,114			911,991			3,228,806			1,162,145			5,776,311			1,004,521			419,968			18,602,856
Total loans	$	6,190,683		$	918,212		$	3,234,266		$	1,162,145		$	5,783,267		$	1,005,802		$	419,968		$	18,714,343

A summary of the changes in the allowance for unfunded commitments was as follows.

	Three Months Ended March 31, 2016		Year Ended December 31, 2015
	($ in Thousands)
Allowance for Unfunded Commitments:
Balance at beginning of period	$	24,400	$	24,900
Provision for unfunded commitments	—		(500		)
Balance at end of period	$	24,400	$	24,400

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Goodwill and Intangible Assets

3 Months Ended

Mar. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill and Other Intangible Assets

Goodwill:  Goodwill is not amortized but, instead, is subject to impairment tests on at least an annual basis, and more frequently if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The impairment testing process is conducted by assigning net assets and goodwill to each reporting unit. An initial qualitative evaluation is made to assess the likelihood of impairment and determine whether further quantitative testing to calculate the fair value is necessary. When the qualitative evaluation indicates that impairment is more likely than not, quantitative testing is required whereby the fair value of each reporting unit is calculated and compared to the recorded book value, “step one.” If the calculated fair value of the reporting unit exceeds its carrying value, goodwill is not considered impaired and “step two” is not considered necessary. If the carrying value of a reporting unit exceeds its calculated fair value, the impairment test continues (“step two”) by comparing the carrying value of the reporting unit’s goodwill to the implied fair value of goodwill. The implied fair value is computed by adjusting all assets and liabilities of the reporting unit to current fair value with the offset adjustment to goodwill. The adjusted goodwill balance is the implied fair value of the goodwill. An impairment charge is recognized if the carrying value of goodwill exceeds the implied fair value of goodwill.

The Corporation conducted its most recent annual impairment testing in May 2015, utilizing a qualitative assessment. Factors that management considered in this assessment included macroeconomic conditions, industry and market considerations, overall financial performance of the Corporation and each reporting unit (both current and projected), changes in management strategy, and changes in the composition or carrying amount of net assets. In addition, management considered the changes in both the Corporation’s common stock price and in the overall bank common stock index (based on the S&P 400 Regional Bank Sub-Industry Index), as well as the Corporation’s earnings per common share trend over the past year. Based on these assessments, management concluded that the 2015 annual qualitative impairment assessment indicated that it is more likely than not that the estimated fair value exceeded the carrying value (including goodwill) for each reporting unit. Therefore, a step one quantitative analysis was not required. There were no events since the May 2015 impairment testing that have changed the Corporation's impairment assessment conclusion. There were no impairment charges recorded in 2015 or the first three months of 2016.

At March 31, 2016, the Corporation had goodwill of $972 million, compared to $969 million at December 31, 2015. Goodwill increased by approximately $3 million during the first quarter of 2016 as a result of two small insurance acquisitions. See Note 2 for additional information on the Corporation's acquisitions.

Other Intangible Assets:  The Corporation has other intangible assets that are amortized, consisting of core deposit intangibles, other intangibles (primarily related to customer relationships acquired in connection with the Corporation’s insurance agency acquisitions), and mortgage servicing rights. Core deposit intangibles of approximately $15 million were fully amortized in 2015 and have been removed from both the gross carrying amount and the accumulated amortization for 2016. Other intangibles increased by approximately $1 million during the first quarter of 2016 for the customer relationships associated with two small insurance acquisitions. See Note 2 for additional information on the Corporation's acquisitions. For core deposit intangibles and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows.

	Three Months Ended March 31, 2016			Year Ended  December 31, 2015
	($ in Thousands)
Core deposit intangibles:
Gross carrying amount	$	4,385		$	19,545
Accumulated amortization	(4,062		)	(19,152		)
Net book value	$	323		$	393
Amortization during the year	$	70		$	1,404
Other intangibles:
Gross carrying amount	$	32,410		$	31,398
Accumulated amortization	(15,767		)	(15,333		)
Net book value	$	16,643		$	16,065
Additions during the period	$	1,012		$	12,115
Amortization during the year	$	434		$	1,690

The Corporation sells residential mortgage loans in the secondary market and typically retains the right to service the loans sold. Mortgage servicing rights are amortized in proportion to and over the period of estimated net servicing income, and assessed for impairment at each reporting date.

The Corporation periodically evaluates its mortgage servicing rights asset for impairment. Impairment is assessed based on fair value at each reporting date using estimated prepayment speeds of the underlying mortgage loans serviced and stratifications based on the risk characteristics of the underlying loans (predominantly loan type and note interest rate). As mortgage interest rates fall, prepayment speeds are usually faster and the value of the mortgage servicing rights asset generally decreases, requiring additional valuation reserve. Conversely, as mortgage interest rates rise, prepayment speeds are usually slower and the value of the mortgage servicing rights asset generally increases, requiring less valuation reserve. A valuation allowance is established, through a charge to earnings, to the extent the amortized cost of the mortgage servicing rights exceeds the estimated fair value by stratification. If it is later determined that all or a portion of the temporary impairment no longer exists for a stratification, the valuation is reduced through a recovery to earnings. An other-than-temporary impairment (i.e., recoverability is considered remote when considering interest rates and loan pay off activity) is recognized as a write-down of the mortgage servicing rights asset and the related valuation allowance (to the extent a valuation allowance is available) and then against earnings. A direct write-down permanently reduces the carrying value of the mortgage servicing rights asset and valuation allowance, precluding subsequent recoveries. See Note 12 for a discussion of the recourse provisions on sold residential mortgage loans. See Note 13 which further discusses fair value measurement relative to the mortgage servicing rights asset.

A summary of changes in the balance of the mortgage servicing rights asset and the mortgage servicing rights valuation allowance was as follows.

	Three Months Ended  March 31, 2016			Year Ended December 31, 2015
	($ in Thousands)
Mortgage servicing rights
Mortgage servicing rights at beginning of period	$	62,150		$	61,379
Additions	1,856			12,372
Amortization	(2,874		)	(11,601		)
Mortgage servicing rights at end of period	$	61,132		$	62,150
Valuation allowance at beginning of period	(809		)	(1,234		)
(Additions) recoveries, net	(909		)	425
Valuation allowance at end of period	(1,718		)	(809		)
Mortgage servicing rights, net	$	59,414		$	61,341
Fair value of mortgage servicing rights	$	61,410		$	70,686
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$	7,876,888		$	7,915,224
Mortgage servicing rights, net to servicing portfolio	0.75		%	0.77		%
Mortgage servicing rights expense (1)	$	3,783		$	11,176

(1) Includes the amortization of mortgage servicing rights and additions / recoveries to the valuation allowance of mortgage servicing rights, and is a component of mortgage banking, net in the consolidated statements of income.

The following table shows the estimated future amortization expense for amortizing intangible assets. The projections of amortization expense are based on existing asset balances, the current interest rate environment, and prepayment speeds as of March 31, 2016. The actual amortization expense the Corporation recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements, and events or circumstances that indicate the carrying amount of an asset may not be recoverable.

Estimated Amortization Expense	Core Deposit Intangibles		Other Intangibles		Mortgage Servicing Rights
	($ in Thousands)
Nine months ending December 31, 2016	$	211	$	1,378	$	8,850
2017	112		1,786		9,674
2018	—		1,756		7,761
2019	—		1,457		6,313
2020	—		1,340		5,169
2021	—		1,316		4,265
Beyond 2021	—		7,610		19,100
Total Estimated Amortization Expense	$	323	$	16,643	$	61,132

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Short and Long-Term Funding

3 Months Ended

Mar. 31, 2016

Debt Disclosure [Abstract]

Short and Long-Term Funding

Short and Long-Term Funding

The components of short-term funding (funding with original contractual maturities of one year or less) and long-term funding (funding with original contractual maturities greater than one year) were as follows.

	March 31, 2016			December 31, 2015
	($ in Thousands)
Short-Term Funding
Federal funds purchased	$	74,985		$	47,870
Securities sold under agreements to repurchase	508,262			383,568
Federal funds purchased and securities sold under agreements to repurchase	$	583,247		$	431,438
FHLB advances	770,000			335,000
Commercial paper	64,161			67,978
Other short-term funding	834,161			402,978
Total short-term funding	$	1,417,408		$	834,416
Long-Term Funding
FHLB advances	$	2,365,216		$	1,750,225
Senior notes, at par	250,000			680,000
Subordinated notes, at par	250,000			250,000
Other long-term funding and capitalized costs (1)	(3,900		)	(4,061		)
Total long-term funding	2,861,316			2,676,164
Total short and long-term funding	$	4,278,724		$	3,510,580
(1) Debt issuance costs are now reflected on the balance sheet with the related debt issued rather than within other assets.  See Note 3 for additional information on this new accounting standard.

Securities sold under agreements to repurchase ("repurchase agreements")

The Corporation enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. Under these arrangements, the Corporation may transfer legal control over the assets but still retain effective control through an agreement that both entitles and obligates the Corporation to repurchase the assets. The obligation to repurchase the securities is reflected as a liability on the Corporation’s consolidated balance sheets, while the securities underlying the repurchase agreements remain in the respective investment securities asset accounts (i.e., there is no offsetting or netting of the investment securities assets with the repurchase agreement liabilities). See Note 11 for additional disclosures on balance sheet offsetting.

The Corporation utilizes securities sold under agreements to repurchase to facilitate the needs of its customers. As of March 31, 2016, the Corporation pledged GSE mortgage-related securities with a fair value of $643 million as collateral for the repurchase agreements. Securities pledged as collateral under repurchase agreements are maintained with the Corporation's safekeeping agents and are monitored on a daily basis due to the market risk of fair value changes in the underlying securities. The Corporation generally pledges excess securities to ensure there is sufficient collateral to satisfy short-term fluctuations in both the repurchase agreement balances and the fair value of the underlying securities.

The remaining contractual maturity of the securities sold under agreements to repurchase in the consolidated balance sheets as of March 31, 2016 and December 31, 2015 are presented in the following table.

	Remaining Contractual Maturity of the Agreements
March 31, 2016	Overnight and Continuous		Up to 30 days		30-90 days		Greater than 90 days		Total
					($ in Thousands)
Repurchase agreements
GSE securities	$	508,262	$	—	$	—	$	—	$	508,262
Total	$	508,262	$	—	$	—	$	—	$	508,262
December 31, 2015
Repurchase agreements
GSE securities	$	383,568	$	—	$	—	$	—	$	383,568
Total	$	383,568	$	—	$	—	$	—	$	383,568

Long-term funding:

FHLB advances:  At March 31, 2016, the long-term FHLB advances had a weighted average interest rate of 0.29%, compared to 0.24% at December 31, 2015. The FHLB advances are indexed to the FHLB discount note and re-price at varying intervals. The advances offer flexible, low cost, long-term funding that improves the Corporation’s liquidity profile.

2011 Senior Notes:  In March 2011, the Corporation issued $300 million of senior notes due March 2016, and callable February 2016, with a 5.125% fixed coupon at a discount. In September 2011, the Corporation “re-opened” the offering and issued an additional $130 million of the same notes at a premium. All notes were redeemed in February 2016 at par.

2014 Senior Notes:  In November 2014, the Corporation issued $250 million of senior notes, due November 2019, and callable October 2019. The senior notes have a fixed coupon interest rate of 2.75% and were issued at a discount.

2014 Subordinated Notes:  In November 2014, the Corporation issued $250 million of 10-year subordinated notes, due January 2025, and callable October 2024. The subordinated notes have a fixed coupon interest rate of 4.25% and were issued at a discount.

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Derivative and Hedging Activities

3 Months Ended

Mar. 31, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative and Hedging Activities

Derivative and Hedging Activities

The Corporation facilitates customer borrowing activity by providing various interest rate risk management, commodity hedging, and foreign currency exchange solutions through its capital markets area. To date, all of the notional amounts of customer transactions have been matched with a mirror hedge with another counterparty. The Corporation has used, and may use again in the future, derivative instruments to hedge the variability in interest payments or protect the value of certain assets and liabilities recorded on its consolidated balance sheets from changes in interest rates. The predominant derivative and hedging activities include interest rate-related instruments (swaps and caps), foreign currency exchange forwards, commodity contracts, written options, purchased options, and certain mortgage banking activities.

The contract or notional amount of a derivative is used to determine, along with the other terms of the derivative, the amounts to be exchanged between the counterparties. The Corporation is exposed to credit risk in the event of nonperformance by counterparties to financial instruments. To mitigate the counterparty risk, interest rate and commodity-related instruments generally contain language outlining collateral pledging requirements for each counterparty. Collateral must be posted when the market value exceeds certain mutually agreed upon threshold limits. The Corporation was required to pledge $28 million of investment securities as collateral at March 31, 2016, and pledged $9 million of investment securities as collateral at December 31, 2015. Federal regulations require the Corporation to clear all LIBOR interest rate swaps through a clearing house if it can be cleared. As such, the Corporation is required to pledge cash collateral for the margin. At March 31, 2016, the Corporation posted cash collateral for the margin of $31 million, compared to $22 million at December 31, 2015.

The Corporation’s derivative and hedging instruments are recorded at fair value on the consolidated balance sheets. The fair value of the Corporation’s interest rate-related instruments is determined using discounted cash flow analysis on the expected cash flows of each derivative and also includes a nonperformance / credit risk component (credit valuation adjustment). See Note 13 for additional fair value information and disclosures.

The table below identifies the balance sheet category and fair values of the Corporation’s free standing derivative instruments, which are not designated as hedging instruments.

	March 31, 2016						December 31, 2015
($ in Thousands)	Notional Amount		Fair Value			Balance Sheet Category	Notional Amount		Fair Value			Balance Sheet Category
Interest rate-related instruments — customer and mirror	$	1,806,688	$	47,780		Trading assets	$	1,665,965	$	29,391		Trading assets
Interest rate-related instruments — customer and mirror	1,806,688		(50,145		)	Trading liabilities	1,665,965		(30,886		)	Trading liabilities
Interest rate lock commitments (mortgage)	418,136		2,689			Other assets	271,530		958			Other assets
Forward commitments (mortgage)	249,866		(1,732		)	Other liabilities	231,798		403			Other assets
Foreign currency exchange forwards	124,617		4,203			Trading assets	72,976		1,532			Trading assets
Foreign currency exchange forwards	116,751		(4,097		)	Trading liabilities	65,649		(1,398		)	Trading liabilities
Commodity contracts	43,646		1,104			Trading assets	44,380		1,269			Trading assets
Commodity contracts	43,770		(981		)	Trading liabilities	44,256		(1,146		)	Trading liabilities
Purchased options (time deposit)	103,475		2,228			Other assets	104,582		2,715			Other assets
Written options (time deposit)	103,475		(2,228		)	Other liabilities	104,582		(2,715		)	Other liabilities

The table below identifies the income statement category of the gains and losses recognized in income on the Corporation’s derivative instruments not designated as hedging instruments.

	Income Statement Category of Gain / (Loss) Recognized in Income	For the Three Months Ended March 31,
($ in Thousands)		2016			2015
Derivative Instruments:
Interest rate-related instruments — customer and mirror, net	Capital market fees, net	$	(870	)	$	(294	)
Interest rate lock commitments (mortgage)	Mortgage banking, net	1,731			1,738
Forward commitments (mortgage)	Mortgage banking, net	(2,135		)	640
Foreign currency exchange forwards	Capital market fees, net	(28		)	66
Commodity contracts	Capital market fees, net	—			—

Free Standing Derivatives

The Corporation enters into various derivative contracts which are designated as free standing derivative contracts. Free standing derivative products are entered into primarily for the benefit of commercial customers seeking to manage their exposures to interest rate risk, foreign currency, and commodity prices. These derivative contracts are not designated against specific assets and liabilities on the balance sheet or forecasted transactions and, therefore, do not qualify for hedge accounting treatment. Such derivative contracts are carried at fair value on the consolidated balance sheets with changes in the fair value recorded as a component of Capital market fees, net, and typically include interest rate-related instruments (swaps and caps), foreign currency exchange forwards, and commodity contracts. See Note 11 for additional information and disclosures on balance sheet offsetting.

Interest rate-related instruments: The Corporation provides interest rate risk management services to commercial customers, primarily forward interest rate swaps and caps. The Corporation’s market risk from unfavorable movements in interest rates related to these derivative contracts is generally economically hedged by concurrently entering into offsetting derivative contracts. The offsetting derivative contracts have identical notional values, terms and indices.

Foreign currency exchange forwards: The Corporation provides foreign currency exchange services to customers, primarily forward contracts. Our customers enter into a foreign currency exchange forward with the Corporation as a means for them to mitigate exchange rate risk. The Corporation mitigates its risk by then entering into an offsetting foreign currency exchange derivative contract. Such foreign currency exchange contracts are carried at fair value on the consolidated balance sheets with changes in fair value recorded as a component of Capital market fees, net.

Commodity contracts: Commodity contracts are entered into primarily for the benefit of commercial customers seeking to manage their exposure to fluctuating commodity prices. The Corporation mitigates its risk by then entering into an offsetting commodity derivative contract. Commodity contracts are carried at fair value on the consolidated balance sheets with changes in fair value recorded as a component of Capital market fees, net.

Mortgage derivatives

Interest rate lock commitments to originate residential mortgage loans held for sale and forward commitments to sell residential mortgage loans are considered derivative instruments, and the fair value of these commitments is recorded on the consolidated balance sheets with the changes in fair value recorded as a component of mortgage banking, net.

Written and purchased options (time deposit)

Historically, the Corporation had entered into written and purchased option derivative instruments to facilitate an equity linked time deposit product (the “Power CD”), which the Corporation ceased offering in September 2013. The Power CD was a time deposit that provided the purchaser a guaranteed return of principal at maturity plus a potential equity return (a written option), while the Corporation received a known stream of funds based on the equity return (a purchased option). The written and purchased options are mirror derivative instruments which are carried at fair value on the consolidated balance sheets.

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Balance Sheet Offsetting

3 Months Ended

Mar. 31, 2016

Offsetting [Abstract]

Balance Sheet Offsetting

Balance Sheet Offsetting

Interest Rate-Related Instruments and Commodity Contracts (“Interest and Commodity Agreements”)

The Corporation enters into interest rate-related instruments to facilitate the interest rate risk management strategies of commercial customers. The Corporation also enters into commodity contracts to manage commercial customers' exposure to fluctuating commodity prices. The Corporation mitigates these risks by entering into equal and offsetting interest and commodity agreements with highly rated third party financial institutions. The Corporation is party to master netting arrangements with its financial institution counterparties that creates a single net settlement of all legal claims or obligations to pay or receive the net amount of settlement of the individual interest and commodity agreements. Collateral, usually in the form of investment securities and cash, is posted by the counterparty with net liability positions in accordance with contract thresholds. The Corporation does not offset assets and liabilities under these arrangements for financial statement presentation purposes. See Note 10 for additional information on the Corporation’s derivative and hedging activities.

Securities Sold Under Agreements to Repurchase (“Repurchase Agreements”)

The Corporation enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. These repurchase agreements are accounted for as collateralized financing arrangements (i.e., secured borrowings) and not as a sale and subsequent repurchase of securities (i.e., there is no offsetting or netting of the investment securities assets with the repurchase agreement liabilities). The right of set-off for a repurchase agreement resembles a secured borrowing, whereby the collateral would be used to settle the fair value of the repurchase agreement should the Corporation be in default (e.g., fails to make an interest payment to the counterparty). In addition, the Corporation does not enter into reverse repurchase agreements; therefore, there is no such offsetting to be done with the repurchase agreements. See Note 9 for additional disclosures on repurchase agreements.

The following table presents the assets and liabilities subject to an enforceable master netting arrangement. The interest and commodity agreements we have with our commercial customers are not subject to an enforceable master netting arrangement, and therefore, are excluded from this table.

	Gross amounts recognized						Gross amounts not offset in the balance sheet
			Gross amounts offset in the balance sheet		Net amounts presented in the balance sheet		Financial instruments			Collateral			Net amount
	($ in Thousands)
March 31, 2016
Derivative assets:
Interest and commodity agreements	$	823	$	—	$	823	$	(823	)	$	—		$	—
Derivative liabilities:
Interest and commodity agreements	$	48,700	$	—	$	48,700	$	(823	)	$	(47,877	)	$	—
December 31, 2015
Derivative assets:
Interest and commodity instruments	$	1,466	$	—	$	1,466	$	(1,466	)	$	—		$	—
Derivative liabilities:
Interest and commodity instruments	$	30,200	$	—	$	30,200	$	(1,466	)	$	(28,734	)	$	—

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Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings

3 Months Ended

Mar. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings

Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings

The Corporation utilizes a variety of financial instruments in the normal course of business to meet the financial needs of its customers and to manage its own exposure to fluctuations in interest rates. These financial instruments include lending-related and other commitments (see below) as well as derivative instruments (see Note 10). The following is a summary of lending-related commitments.

	March 31, 2016		December 31, 2015
	($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(1)(2)	$	7,315,642	$	7,402,518
Commercial letters of credit(1)	7,782		9,945
Standby letters of credit(3)	278,740		296,508

1) These off-balance sheet financial instruments are exercisable at the market rate prevailing at the date the underlying transaction will be completed and, thus, are deemed to have no current fair value, or the fair value is based on fees currently charged to enter into similar agreements and is not material at March 31, 2016 or December 31, 2015.

2) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 10.

3) The Corporation has established a liability of $3 million at both March 31, 2016 and December 31, 2015, as an estimate of the fair value of these financial instruments.

Lending-related Commitments

As a financial services provider, the Corporation routinely enters into commitments to extend credit. Such commitments are subject to the same credit policies and approval process accorded to loans made by the Corporation, with each customer’s creditworthiness evaluated on a case-by-case basis. The commitments generally have fixed expiration dates or other termination clauses and may require the payment of a fee. The Corporation’s exposure to credit loss in the event of nonperformance by the other party to these financial instruments is represented by the contractual amount of those instruments. The amount of collateral obtained, if deemed necessary by the Corporation upon extension of credit, is based on management’s credit evaluation of the customer. Since a significant portion of commitments to extend credit are subject to specific restrictive loan covenants or may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash flow requirements. An allowance for unfunded commitments is maintained at a level believed by management to be sufficient to absorb estimated probable losses related to unfunded commitments (including unfunded loan commitments and letters of credit). The allowance for unfunded commitments totaled $24 million at both March 31, 2016 and December 31, 2015, and is included in accrued expenses and other liabilities on the consolidated balance sheets.

Lending-related commitments include commitments to extend credit, commitments to originate residential mortgage loans held for sale, commercial letters of credit, and standby letters of credit. Commitments to extend credit are legally binding agreements to lend to customers at predetermined interest rates, as long as there is no violation of any condition established in the contracts. Interest rate lock commitments to originate residential mortgage loans held for sale and forward commitments to sell residential mortgage loans are considered derivative instruments, and the fair value of these commitments is recorded on the consolidated balance sheets. The Corporation’s derivative and hedging activity is further described in Note 10. Commercial and standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Commercial letters of credit are issued specifically to facilitate commerce and typically result in the commitment being drawn on when the underlying transaction is consummated between the customer and the third party, while standby letters of credit generally are contingent upon the failure of the customer to perform according to the terms of the underlying contract with the third party.

Other Commitments

The Corporation has principal investment commitments to provide capital-based financing to private and public companies through either direct investments in specific companies or through investment funds and partnerships. The timing of future cash requirements to fund such commitments is generally dependent on the investment cycle, whereby privately held companies are funded by private equity investors and ultimately sold, merged, or taken public through an initial offering, which can vary based on overall market conditions, as well as the nature and type of industry in which the companies operate. The Corporation also invests in unconsolidated projects including low-income housing, new market tax credit projects, and historic tax credit projects to promote the revitalization of primarily low-to-moderate-income neighborhoods throughout the local communities of its bank subsidiary. As a limited partner in these unconsolidated projects, the Corporation is allocated tax credits and deductions associated with the underlying projects. The aggregate carrying value of these investments at March 31, 2016, was $53 million, compared to $52 million at December 31, 2015, included in other assets on the consolidated balance sheets. Related to these investments, the Corporation had remaining commitments to fund of $62 million at March 31, 2016, and $61 million at December 31, 2015.

Legal Proceedings

The Corporation is party to various pending and threatened claims and legal proceedings arising in the normal course of business activities, some of which involve claims for substantial amounts. Although there can be no assurance as to the ultimate outcomes, the Corporation believes it has meritorious defenses to the claims asserted against it in its currently outstanding matters, including the matters described below, and with respect to such legal proceedings, intends to continue to defend itself vigorously. The Corporation will consider settlement of cases when, in management’s judgment, it is in the best interests of both the Corporation and its shareholders.

On at least a quarterly basis, the Corporation assesses its liabilities and contingencies in connection with all pending or threatened claims and litigation, utilizing the most recent information available. On a matter by matter basis, an accrual for loss is established for those matters which the Corporation believes it is probable that a loss may be incurred and that the amount of such loss can be reasonably estimated. Once established, each accrual is adjusted as appropriate to reflect any subsequent developments. Accordingly, management’s estimate will change from time to time, and actual losses may be more or less than the current estimate. For matters where a loss is not probable, or the amount of the loss cannot be estimated, no accrual is established.

Resolution of legal claims is inherently unpredictable, and in many legal proceedings various factors exacerbate this inherent unpredictability, including where the damages sought are unsubstantiated or indeterminate, it is unclear whether a case brought as a class action will be allowed to proceed on that basis, discovery is not complete, the proceeding is not yet in its final stages, the matters present legal uncertainties, there are significant facts in dispute, there are a large number of parties (including where it is uncertain how liability, if any, will be shared among multiple defendants), or there is a wide range of potential results.

A lawsuit, R.J. ZAYED v. Associated Bank, N.A., was filed in the United States District Court for the District of Minnesota on January 29, 2013. The lawsuit relates to a Ponzi scheme perpetrated by Oxford Global Partners and related entities (“Oxford”) and individuals and was brought by the receiver for Oxford. Oxford was a depository customer of Associated Bank (the "Bank"). The lawsuit claims that the Bank is liable for failing to uncover the Oxford Ponzi scheme, and specifically alleges the Bank aided and abetted (1) the fraudulent scheme; (2) a breach of fiduciary duty; (3) conversion; and (4) false representations and omissions. The lawsuit seeks unspecified consequential and punitive damages. The District Court granted the Bank’s motion to dismiss the complaint on September 30, 2013. On March 2, 2015, the U.S. Court of Appeals for the Eighth Circuit reversed the District Court and remanded the case back to the District Court for further proceedings. It is not possible for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss at this time. A lawsuit by investors in the same Ponzi scheme, Herman Grad, et al v. Associated Bank, N.A., brought in Brown County, Wisconsin in October 2009 was dismissed by the circuit court, and the dismissal was affirmed by the Wisconsin Court of Appeals in June 2011 in an unpublished opinion.

On May 22, 2015, the Bank entered into a Conciliation Agreement ("Conciliation Agreement") with the U.S. Department of Housing and Urban Development ("HUD") which resolved the HUD investigation into the Bank's lending practices during the years 2008-2010. The Bank's commitments under the Conciliation Agreement are spread over a three-year period and include commitments to do the following in minority communities: make mortgage loans of approximately $196 million; open one branch and four loan production offices; establish special financing programs; make affordable home repair grants; engage in affirmative marketing outreach; provide financial education programs; and make grants to support community reinvestment training and education. The cost of these commitments will be spread over four calendar years and is not expected to have a material impact on the Corporation's financial condition or results of operation.

Beginning in late 2013, the Corporation began reviewing a variety of legacy products provided by third parties, including debt protection and identity protection products. In connection with this review, the Corporation has made, and plans to make, remediation payments to affected customers and former customers, and has reserved accordingly.

A variety of consumer products, including the legacy debt protection and identity protection products referred to above, and mortgage and deposit products, and certain fees and charges related to such products, have come under increased regulatory scrutiny. It is possible that regulatory authorities could bring enforcement actions, including civil money penalties, or take other actions against the Corporation and the Bank in regard to these consumer products. The Bank could also determine of its own accord, or be required by regulators, to refund or otherwise make remediation payments to customers in connection with these products. It is not possible at this time for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss related to such matters.

Two complaints were filed against the Bank on January 11, 2016 in the United States Bankruptcy Court for the Northern District of Illinois, Eastern Division in connection with the In re: World Marketing Chicago, LLC, et al Chapter 11 bankruptcy proceeding. In the first complaint, The Official Committee of Unsecured Creditors of World Marketing Chicago, LLC, et al v. Associated Bank, N.A., the plaintiff seeks to avoid guarantees and pledges of collateral given by the debtors to secure a revolving financing commitment of $6 million to the debtors’ parent company from the Bank. The plaintiff alleges a variety of legal theories under federal and state law, including fraudulent conveyance, preferential transfer and conversion, in support of its position. The plaintiff seeks return of approximately $4 million paid to the Bank and the avoidance of the security interest in the collateral securing the remaining approximately $1 million of indebtedness to the Bank. The Bank intends to vigorously defend this lawsuit. In the second complaint, American Funds Service Company v. Associated Bank, N.A., the plaintiff alleges that approximately $600,000 of funds it had advanced to the World Marketing entities to apply towards future postage fees was swept by the Bank from World Marketing’s bank accounts. Plaintiff seeks the return of such funds from the Bank under several theories, including Sec. 541(d) of the Bankruptcy Code, the creation of a resulting trust, and unjust enrichment. The Bank intends to vigorously defend this lawsuit. It is not possible for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss at this time with respect to these two lawsuits.

Mortgage Repurchase Reserve

The Corporation sells residential mortgage loans to investors in the normal course of business. Residential mortgage loans sold to others are predominantly conventional residential first lien mortgages originated under our usual underwriting procedures, and are most often sold on a nonrecourse basis, primarily to the GSEs. The Corporation’s agreements to sell residential mortgage loans in the normal course of business usually require certain representations and warranties on the underlying loans sold, related to credit information, loan documentation, collateral, and insurability. Subsequent to being sold, if a material underwriting deficiency or documentation defect is discovered, the Corporation may be obligated to repurchase the loan or reimburse the GSEs for losses incurred (collectively, “make whole requests”). The make whole requests and any related risk of loss under the representations and warranties are largely driven by borrower performance.

As a result of make whole requests, the Corporation has repurchased loans with principal balances of approximately $126,000 and $3 million during the three months ended March 31, 2016 and the year ended December 31, 2015, respectively, and paid loss reimbursement or settlement claims of approximately $3,000 and $133,000 for the three months ended March 31, 2016 and the year ended December 31, 2015, respectively. Make whole requests during 2015 and the first three months of 2016 generally arose from loans sold during the period of January 1, 2012 to March 31, 2016, which total $7.9 billion at the time of sale, and consisted primarily of loans sold to GSEs. As of March 31, 2016, approximately $5.7 billion of these sold loans remain outstanding.

The balance in the mortgage repurchase reserve at the balance sheet date reflects the estimated amount of potential loss the Corporation could incur from repurchasing a loan, as well as loss reimbursements, indemnifications, and other settlement resolutions. The following summarizes the changes in the mortgage repurchase reserve.

	For the Three Months Ended March 31, 2016			For the Year Ended December 31, 2015
	($ in Thousands)
Balance at beginning of period	$	1,197		$	3,258
Repurchase provision expense	70			428
Adjustments to provision expense	—			(2,450		)
Charge offs, net	(3		)	(39		)
Balance at end of period	$	1,264		$	1,197

The Corporation may also sell residential mortgage loans with limited recourse (limited in that the recourse period ends prior to the loan’s maturity, usually after certain time and / or loan paydown criteria have been met), whereby repurchase could be required if the loan had defined delinquency issues during the limited recourse periods. At March 31, 2016, and December 31, 2015, there were approximately $60 million and $68 million, respectively, of residential mortgage loans sold with such recourse risk. There have been limited instances and immaterial historical losses on repurchases for recourse under the limited recourse criteria.

The Corporation has a subordinate position to the FHLB in the credit risk on residential mortgage loans it sold to the FHLB in exchange for a monthly credit enhancement fee. The Corporation has not sold loans to the FHLB with such credit risk retention since February 2005. At March 31, 2016 and December 31, 2015, there were $122 million and $132 million, respectively, of such residential mortgage loans with credit risk recourse, upon which there have been negligible historical losses to the Corporation.

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Fair Value Measurements

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

Fair value represents the estimated price at which an orderly transaction to sell an asset or to transfer a liability would take place between market participants at the measurement date under current market conditions (i.e., an exit price concept).

Following is a description of the valuation methodologies used for the Corporation’s more significant instruments measured on a recurring basis at fair value, including the general classification of such instruments pursuant to the valuation hierarchy.

Investment securities available for sale:  Where quoted prices are available in an active market, investment securities are classified in Level 1 of the fair value hierarchy. If quoted market prices are not available for the specific security, then fair values are estimated by using pricing models, quoted prices of securities with similar characteristics or discounted cash flows, with consideration given to the nature of the quote and the relationship of recently evidenced market activity to the fair value estimate, and are classified in Level 2 of the fair value hierarchy. Lastly, in certain cases where there is limited activity or less transparency around inputs to the estimated fair value, securities are classified within Level 3 of the fair value hierarchy. To validate the fair value estimates, assumptions, and controls, the Corporation looks to transactions for similar instruments and utilizes independent pricing provided by third party vendors or brokers and relevant market indices. While none of these sources are solely indicative of fair value, they serve as directional indicators for the appropriateness of the Corporation’s fair value estimates. The Corporation has determined that the fair value measures of its investment securities are classified predominantly within Level 1 or 2 of the fair value hierarchy. See Note 6 for additional disclosure regarding the Corporation’s investment securities.

Derivative financial instruments (interest rate-related instruments):  The Corporation has used, and may use again in the future, interest rate swaps to manage its interest rate risk. In addition, the Corporation offers customer interest rate-related instruments (swaps and caps) to service our customers’ needs, for which the Corporation simultaneously enters into offsetting derivative financial instruments (i.e., mirror interest rate-related instruments) with third parties to manage its interest rate risk associated with these financial instruments. The valuation of the Corporation’s derivative financial instruments is determined using discounted cash flow analysis on the expected cash flows of each derivative and, also includes a nonperformance / credit risk component (credit valuation adjustment). See Note 10 for additional disclosure regarding the Corporation’s interest rate-related instruments.

The discounted cash flow analysis component in the fair value measurements reflects the contractual terms of the derivative financial instruments, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. More specifically, the fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments), with the variable cash payments (or receipts) based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. Likewise, the fair values of interest rate options (i.e., interest rate caps) are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates fall below (or rise above) the strike rate of the floors (or caps), with the variable interest rates used in the calculation of projected receipts on the floor (or cap) based on an expectation of future interest rates derived from observable market interest rate curves and volatilities.

The Corporation also incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative financial instruments for the effect of nonperformance risk, the Corporation has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees.

While the Corporation has determined that the majority of the inputs used to value its derivative financial instruments fall within Level 2 of the fair value hierarchy, the credit valuation adjustments utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. The Corporation has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions as of March 31, 2016, and December 31, 2015, and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivative financial instruments. Therefore, the Corporation has determined that the fair value measures of its derivative financial instruments in their entirety are classified within Level 2 of the fair value hierarchy.

Derivative financial instruments (foreign currency exchange forwards):  The Corporation provides foreign currency exchange services to customers. In addition, the Corporation may enter into a foreign currency exchange forward to mitigate the exchange rate risk attached to the cash flows of a loan or as an offsetting contract to a forward entered into as a service to our customer. The valuation of the Corporation’s foreign currency exchange forwards is determined using quoted prices of foreign currency exchange forwards with similar characteristics, with consideration given to the nature of the quote and the relationship of recently evidenced market activity to the fair value estimate, and are classified in Level 2 of the fair value hierarchy. See Note 10 for additional disclosures regarding the Corporation’s foreign currency exchange forwards.

Derivative financial instruments (commodity contracts):  The Corporation enters into commodity contracts to manage commercial customers' exposure to fluctuating commodity prices, for which the Corporation simultaneously enters into offsetting derivative financial instruments (i.e., mirror commodity contracts) with third parties to manage its risk associated with these financial instruments. The valuation of the Corporation’s commodity contracts is determined using quoted prices of the underlying instrument, and are classified in Level 2 of the fair value hierarchy. See Note 10 for additional disclosures regarding the Corporation’s commodity contracts.

Derivative financial instruments (mortgage derivatives):  Mortgage derivatives include interest rate lock commitments to originate residential mortgage loans held for sale to individual customers and forward commitments to sell residential mortgage loans to various investors. The Corporation relies on an internal valuation model to estimate the fair value of its interest rate lock commitments to originate residential mortgage loans held for sale, which includes grouping the interest rate lock commitments by interest rate and terms, applying an estimated pull-through rate based on historical experience, and then multiplying by quoted investor prices determined to be reasonably applicable to the loan commitment groups based on interest rate, terms, and rate lock expiration dates of the loan commitment groups.

The Corporation also relies on an internal valuation model to estimate the fair value of its forward commitments to sell residential mortgage loans (i.e., an estimate of what the Corporation would receive or pay to terminate the forward delivery contract based on market prices for similar financial instruments), which includes matching specific terms and maturities of the forward commitments against applicable investor pricing available. While there are Level 2 and 3 inputs used in the valuation models, the Corporation has determined that the majority of the inputs significant in the valuation of both of the mortgage derivatives fall within Level 3 of the fair value hierarchy. See Note 10 for additional disclosure regarding the Corporation’s mortgage derivatives.

Following is a description of the valuation methodologies used for the Corporation’s more significant instruments measured on a nonrecurring basis at the lower of amortized cost or estimated fair value, including the general classification of such instruments pursuant to the valuation hierarchy.

Loans Held for Sale:  Loans held for sale, which consist generally of current production of certain fixed-rate, first-lien residential mortgage loans, are carried at the lower of cost or estimated fair value. The estimated fair value was based on what secondary markets are currently offering for portfolios with similar characteristics, which the Corporation classifies as a Level 2 nonrecurring fair value measurement.

Impaired Loans:  The Corporation considers a loan impaired when it is probable that the Corporation will be unable to collect all amounts due according to the original contractual terms of the note agreement, including both principal and interest. Management has determined that commercial and consumer loan relationships that have nonaccrual status or have had their terms restructured in a troubled debt restructuring meet this impaired loan definition. For individually evaluated impaired loans, the amount of impairment is based upon the present value of expected future cash flows discounted at the loan’s effective interest rate, the estimated fair value of the underlying collateral for collateral-dependent loans, or the estimated liquidity of the note. See Note 7 for additional information regarding the Corporation’s impaired loans.

Mortgage servicing rights:  Mortgage servicing rights do not trade in an active, open market with readily observable prices. While sales of mortgage servicing rights do occur, the precise terms and conditions typically are not readily available to allow for a “quoted price for similar assets” comparison. Accordingly, the Corporation utilizes an independent valuation from a third party which uses a discounted cash flow model to estimate the fair value of its mortgage servicing rights. The valuation model incorporates prepayment assumptions to project mortgage servicing rights cash flows based on the current interest rate scenario, which is then discounted to estimate an expected fair value of the mortgage servicing rights. The valuation model considers portfolio characteristics of the underlying mortgages, contractually specified servicing fees, prepayment assumptions, discount rate assumptions, delinquency rates, late charges, other ancillary revenue, costs to service, and other economic factors. The Corporation periodically reviews and assesses the underlying inputs and assumptions used in the model. In addition, the Corporation compares its fair value estimates and assumptions to observable market data for mortgage servicing rights, where available, and to recent market activity and actual portfolio experience. Due to the nature of the valuation inputs, mortgage servicing rights are classified within Level 3 of the fair value hierarchy. The Corporation uses the amortization method (i.e., lower of amortized cost or estimated fair value measured on a nonrecurring basis), not fair value measurement accounting, for its mortgage servicing rights assets. See Note 8 for additional disclosure regarding the Corporation’s mortgage servicing rights.

The table below presents the Corporation’s investment securities available for sale and derivative financial instruments measured at fair value on a recurring basis as of March 31, 2016 and December 31, 2015, aggregated by the level in the fair value hierarchy within which those measurements fall.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	Fair Value Hierarchy	March 31, 2016		December 31, 2015
		($ in Thousands)
Assets:
Investment securities available for sale:
U.S. Treasury securities	Level 1	$	1,000	$	997
Residential mortgage-related securities:
FNMA / FHLMC	Level 2	1,303,404		1,414,626
GNMA	Level 2	1,547,255		1,590,003
Private-label	Level 2	1,512		1,709
GNMA commercial mortgage-related securities	Level 2	2,047,865		1,955,310
Other securities (debt and equity)	Level 1	1,605		1,569
Other securities (debt and equity)	Level 2	3,000		3,000
Other securities (debt and equity)	Level 3	200		200
Total investment securities available for sale	Level 1	2,605		2,566
Total investment securities available for sale	Level 2	4,903,036		4,964,648
Total investment securities available for sale	Level 3	200		200
Interest rate-related instruments	Level 2	47,780		29,391
Foreign currency exchange forwards	Level 2	4,203		1,532
Interest rate lock commitments to originate residential mortgage loans held for sale	Level 3	2,689		958
Forward commitments to sell residential mortgage loans	Level 3	—		403
Commodity contracts	Level 2	1,104		1,269
Purchased options (time deposit)	Level 2	2,228		2,715
Liabilities:
Interest rate-related instruments	Level 2	50,145		30,886
Foreign currency exchange forwards	Level 2	4,097		1,398
Forward commitments to sell residential mortgage loans	Level 3	1,732		—
Commodity contracts	Level 2	981		1,146
Written options (time deposit)	Level 2	2,228		2,715

The table below presents a rollforward of the balance sheet amounts for the three months ended March 31, 2016 and the year ended December 31, 2015, for financial instruments measured on a recurring basis and classified within Level 3 of the fair value hierarchy.

	Investment Securities Available for Sale		Derivative Financial Instruments
	($ in Thousands)
Balance December 31, 2014	$	200	$	(488	)
Total net gains included in income:
Mortgage derivative gain	—		1,849
Balance December 31, 2015	$	200	$	1,361
Total net losses included in income:
Mortgage derivative loss	—		(404		)
Balance March 31, 2016	$	200	$	957

For Level 3 assets and liabilities measured at fair value on a recurring or nonrecurring basis as of March 31, 2016, the Corporation utilized the following valuation techniques and significant unobservable inputs.

Derivative financial instruments (mortgage derivative — interest rate lock commitments to originate residential mortgage loans held for sale):  The significant unobservable input used in the fair value measurement of the Corporation’s mortgage derivative interest rate lock commitments is the closing ratio, which represents the percentage of loans currently in a lock position which management estimates will ultimately close. The closing ratio calculation takes into consideration historical data and loan-level data, particularly the change in the current interest rates from the time of initial rate lock. The closing ratio is periodically reviewed for reasonableness and reported to the Associated Mortgage Group Risk Committee. At March 31, 2016, the closing ratio was 89%.

Impaired loans:  For individually evaluated impaired loans, the amount of impairment is based upon the present value of expected future cash flows discounted at the loan’s effective interest rate, the estimated fair value of the underlying collateral for collateral-dependent loans, or the estimated liquidity of the note, resulting in an average discount of 10% to 15%.

Mortgage servicing rights:  The discounted cash flow analyses that generate expected market prices utilize the observable characteristics of the mortgage servicing rights portfolio, as well as certain unobservable valuation parameters. The significant unobservable inputs used in the fair value measurement of the Corporation’s mortgage servicing rights are the weighted average constant prepayment rate and weighted average discount rate, which were 15.2% and 9.6% at March 31, 2016, respectively. Significant increases (decreases) in any of those inputs in isolation could result in a significantly lower (higher) fair value measurement.

These parameter assumptions fall within a range that the Corporation, in consultation with an independent third party, believes purchasers of servicing would apply to such portfolios sold into the current secondary servicing market. Discussions are held with members from Treasury and Consumer Banking to reconcile the fair value estimates and the key assumptions used by the respective parties in arriving at those estimates. The Associated Mortgage Group Risk Committee is responsible for providing control over the valuation methodology and key assumptions. To assess the reasonableness of the fair value measurement, the Corporation also compares the fair value and constant prepayment rate to a value calculated by an independent third party on an annual basis.

The table below presents the Corporation’s loans held for sale, impaired loans, and mortgage servicing rights measured at fair value on a nonrecurring basis as of March 31, 2016 and December 31, 2015, aggregated by the level in the fair value hierarchy within which those measurements fall.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

				Income Statement Category of Adjustment Recognized in Income	Adjustment Recognized in Income
($ in Thousands)	Fair Value Hierarchy	Fair Value
March 31, 2016
Assets:
Loans held for sale (2)	Level 2	$	129,398	Mortgage banking, net	$	—
Impaired loans (1)	Level 3	84,664		Provision for credit losses	(15,097		)
Mortgage servicing rights	Level 3	61,410		Mortgage banking, net	(909		)
December 31, 2015
Assets:
Loans held for sale	Level 2	$	124,915	Mortgage banking, net	$	(155	)
Impaired loans (1)	Level 3	41,891		Provision for credit losses	(7,796		)
Mortgage servicing rights	Level 3	70,686		Mortgage banking, net	425

(1) Represents individually evaluated impaired loans, net of the related allowance for loan losses.

(2) Loans held for sale are carried at the lower of cost or estimated fair value. At March 31, 2016, the estimated fair value exceeded the cost and therefore there was no adjustment recognized in Income.

Certain nonfinancial assets measured at fair value on a nonrecurring basis include other real estate owned (upon initial recognition or subsequent impairment), nonfinancial assets and nonfinancial liabilities measured at fair value in the second step of a goodwill impairment test, and intangible assets and other nonfinancial long-lived assets measured at fair value for impairment assessment.

During the first three months of 2016 and the full year 2015, certain other real estate owned, upon initial recognition, was re-measured and reported at fair value through a charge off to the allowance for loan losses based upon the estimated fair value of the other real estate owned, less estimated selling costs. The fair value of other real estate owned, upon initial recognition or subsequent impairment, was estimated using appraised values, which the Corporation classifies as a Level 2 nonrecurring fair value measurement. Other real estate owned measured at fair value upon initial recognition totaled approximately $3 million for the first three months of 2016 and $11 million for the year ended December 31, 2015, respectively. In addition to other real estate owned measured at fair value upon initial recognition, the Corporation also recorded write-downs to the balance of other real estate owned for subsequent impairment of less than $1 million and $3 million to foreclosure / OREO expense, net for the three months ended 2016 and the year ended December 31, 2015, respectively.

Fair Value of Financial Instruments:

The Corporation is required to disclose estimated fair values for its financial instruments. Fair value estimates, methods, and assumptions are set forth below for the Corporation’s financial instruments.

The estimated fair values of the Corporation’s financial instruments were as follows.

		March 31, 2016				December 31, 2015
	Fair Value Hierarchy Level	Carrying Amount		Fair Value		Carrying Amount		Fair Value
		($ in Thousands)
Financial assets:
Cash and due from banks	Level 1	$	287,183	$	287,183	$	374,921	$	374,921
Interest-bearing deposits in other financial institutions	Level 1	68,025		68,025		79,764		79,764
Federal funds sold and securities purchased under agreements to resell	Level 1	20,200		20,200		19,000		19,000
Investment securities held to maturity	Level 2	1,176,821		1,204,345		1,168,230		1,184,442
Investment securities available for sale	Level 1	2,605		2,605		2,566		2,566
Investment securities available for sale	Level 2	4,903,036		4,903,036		4,964,648		4,964,648
Investment securities available for sale	Level 3	200		200		200		200
FHLB and Federal Reserve Bank stocks	Level 2	181,853		181,853		147,240		147,240
Loans held for sale	Level 2	128,339		129,398		124,915		124,915
Loans, net	Level 3	18,949,870		19,025,680		18,440,079		18,389,832
Bank owned life insurance	Level 2	580,583		580,583		583,019		583,019
Derivatives (trading and other assets)	Level 2	55,315		55,315		34,907		34,907
Derivatives (trading and other assets)	Level 3	2,689		2,689		1,361		1,361
Financial liabilities:
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	Level 3	$	19,117,418	$	19,117,418	$	19,444,863	$	19,444,863
Brokered CDs and other time deposits	Level 2	1,568,042		1,576,714		1,562,802		1,564,464
Short-term funding	Level 2	1,417,408		1,417,408		834,416		834,416
Long-term funding	Level 2	2,861,316		2,925,447		2,676,164		2,728,112
Standby letters of credit (1)	Level 2	2,746		2,746		2,954		2,954
Derivatives (trading and other liabilities)	Level 2	57,451		57,451		36,145		36,145
Derivatives (trading and other liabilities)	Level 3	1,732		1,732		—		—

(1) The commitment on standby letters of credit was $279 million and $297 million at March 31, 2016 and December 31, 2015, respectively. See Note 12 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.

Cash and due from banks, interest-bearing deposits in other financial institutions, and federal funds sold and securities purchased under agreements to resell—For these short-term instruments, the carrying amount is a reasonable estimate of fair value.

Investment securities (held to maturity and available for sale)—The fair value of investment securities is based on quoted prices in active markets, or if quoted prices are not available for a specific security, then fair values are estimated by using pricing models, quoted prices of securities with similar characteristics, or discounted cash flows.

FHLB and Federal Reserve Bank stocks—The carrying amount is a reasonable fair value estimate for the Federal Reserve Bank and Federal Home Loan Bank stocks given their “restricted” nature (i.e., the stock can only be sold back to the respective institutions (Federal Home Loan Bank or Federal Reserve Bank) or another member institution at par).

Loans held for sale—The fair value estimation process for the loans held for sale portfolio is segregated by loan type. The estimated fair value was based on what secondary markets are currently offering for portfolios with similar characteristics.

Loans, net—The fair value estimation process for the loan portfolio uses an exit price concept and reflects discounts the Corporation believes are consistent with liquidity discounts in the market place. Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as commercial and industrial, real estate construction, commercial real estate (owner occupied and investor), residential mortgage, home equity, and other consumer. The fair value of loans is estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for similar maturities. The fair value analysis also included other assumptions to estimate fair value, intended to approximate those a market participant would use in an orderly transaction, with adjustments for discount rates, interest rates, liquidity, and credit spreads, as appropriate.

Bank owned life insurance—The fair value of bank owned life insurance approximates the carrying amount, because upon liquidation of these investments, the Corporation would receive the cash surrender value which equals the carrying amount.

Deposits—The fair value of deposits with no stated maturity such as noninterest-bearing demand, savings, interest-bearing demand, and money market accounts, is equal to the amount payable on demand as of the balance sheet date. The fair value of Brokered CDs and other time deposits is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently offered for deposits of similar remaining maturities. However, if the estimated fair value of Brokered CDs and other time deposits is less than the carrying value, the carrying value is reported as the fair value.

Short-term funding—The carrying amount is a reasonable estimate of fair value for existing short-term funding.

Long-term funding—Rates currently available to the Corporation for debt with similar terms and remaining maturities are used to estimate the fair value of existing long-term funding.

Standby letters of credit—The fair value of standby letters of credit represents deferred fees arising from the related off-balance sheet financial instruments. These deferred fees approximate the fair value of these instruments and are based on several factors, including the remaining terms of the agreement and the credit standing of the customer.

Derivatives (trading and other)

Interest rate-related instruments—The fair value of interest rate-related instruments is determined using discounted cash flow analysis on the expected cash flows of each derivative. The Corporation also incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements.

Foreign currency exchange forwards—The fair value of the Corporation’s foreign currency exchange forwards is determined using quoted prices of foreign currency exchange forwards with similar characteristics, with consideration given to the nature of the quote and the relationship of recently evidenced market activity to the fair value estimate.

Purchased and written options—The fair value of the Corporation’s purchased and written options is determined using quoted prices of the underlying stocks.

Commodity contracts—The fair value of the Corporation’s commodity contracts is determined using quoted prices of the underlying instruments.

Interest rate lock commitments to originate residential mortgage loans held for sale—The Corporation relies on an internal valuation model to estimate the fair value of its interest rate lock commitments to originate residential mortgage loans held for sale, which includes grouping the interest rate lock commitments by interest rate and terms, applying an estimated pull-through rate based on historical experience, and then multiplying by quoted investor prices determined to be reasonably applicable to the loan commitment groups based on interest rate, terms, and rate lock expiration dates of the loan commitment groups.

Forward commitments to sell residential mortgage loans—The Corporation relies on an internal valuation model to estimate the fair value of its forward commitments to sell residential mortgage loans (i.e., an estimate of what the Corporation would receive or pay to terminate the forward delivery contract based on market prices for similar financial instruments), which includes matching specific terms and maturities of the forward commitments against applicable investor pricing available.

Limitations—Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Corporation’s entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Corporation’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and, therefore, cannot be determined with precision. Changes in assumptions could significantly affect the estimates.

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Retirement Plans

3 Months Ended

Mar. 31, 2016

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Retirement Plans

Retirement Plans

The Corporation has a noncontributory defined benefit retirement plan (the Retirement Account Plan (“RAP”)) covering substantially all full-time employees. The benefits are based primarily on years of service and the employee’s compensation paid. Employees of acquired entities generally participate in the RAP after consummation of the business combinations. Any retirement plans of acquired entities are typically merged into the RAP after completion of the mergers, and credit is usually given to employees for years of service at the acquired institution for vesting and eligibility purposes.

The Corporation also provides healthcare access for eligible retired employees in its Postretirement Plan (the “Postretirement Plan”). Retirees who are at least 55 years of age with 5 years of service are eligible to participate in the Postretirement Plan. The Corporation has no plan assets attributable to the Postretirement Plan. The Corporation reserves the right to terminate or make changes to the Postretirement Plan at any time.

The components of net periodic benefit cost for the RAP and Postretirement Plans for three months ended March 31, 2016 and 2015 were as follows.

	Three Months Ended March 31,
	2016			2015
	($ in Thousands)
Components of Net Periodic Benefit Cost
Pension Plan:
Service cost	$	1,725		$	3,063
Interest cost	1,780			1,642
Expected return on plan assets	(5,065		)	(5,350		)
Amortization of prior service cost	13			13
Amortization of actuarial loss	482			532
Total net pension cost	$	(1,065	)	$	(100	)
Postretirement Plan:
Interest cost	$	36		$	35
Total net periodic benefit cost	$	36		$	35

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Segment Reporting

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Segment Reporting

Segment Reporting

The Corporation utilizes a risk-based internal profitability measurement system to provide strategic business unit reporting. The profitability measurement system is based on internal management methodologies designed to produce consistent results and reflect the underlying economics of the units. Certain strategic business units have been combined for segment information reporting purposes where the nature of the products and services, the type of customer and the distribution of those products and services are similar. The three reportable segments are Corporate and Commercial Specialty; Community, Consumer, and Business; and Risk Management and Shared Services. The financial information of the Corporation’s segments has been compiled utilizing the accounting policies described in the Corporation’s 2015 Annual Report on Form 10-K, with certain exceptions. The more significant of these exceptions are described herein.

The Corporation allocates net interest income using an internal funds transfer pricing ("FTP") methodology that charges users of funds (assets) and credits providers of funds (liabilities, primarily deposits) based on the maturity, prepayment and / or repricing characteristics of the assets and liabilities. The net effect of this allocation is recorded in the Risk Management and Shared Services segment.

During 2015, the Corporation adopted enhanced FTP methodology utilizing, new, more granular deposit information which incorporated the additional dimension of vintage (based on time from when the deposit account was opened) for determining the funds credit for non-maturity deposits. The new deposit information demonstrated that deposit accounts with the Corporation for a longer period of time had a lower attrition rate, warranting a higher crediting rate (based on a longer-term segment of the yield curve) to reflect the long-term value such deposits provide to the Corporation.

A credit provision is allocated to segments based on the expected long-term annual net charge off rates attributable to the credit risk of loans managed by the segment during the period. In contrast, the level of the consolidated provision for credit losses is determined based on an incurred loss model using the methodologies described in the Corporation’s 2015 Annual Report on Form 10-K to assess the overall appropriateness of the allowance for loan losses. The net effect of the credit provision is recorded in Risk Management and Shared Services. Indirect expenses incurred by certain centralized support areas are allocated to segments based on actual usage (for example, volume measurements) and other criteria. Certain types of administrative expense and bank-wide expense accruals (including amortization of core deposit and other intangible assets associated with acquisitions) are generally not allocated to segments. Income taxes are allocated to segments based on the Corporation’s estimated effective tax rate, with certain segments adjusted for any tax-exempt income or non-deductible expenses. Equity is allocated to the segments based on regulatory capital requirements and in proportion to an assessment of the inherent risks associated with the business of the segment (including interest, credit and operating risk).

The management accounting policies and processes utilized in compiling segment financial information are highly subjective and, unlike financial accounting, are not based on authoritative guidance similar to U.S. generally accepted accounting principles. As a result, reported segments and the financial information of the reported segments are not necessarily comparable with similar information reported by other financial institutions. Furthermore, changes in management structure or allocation methodologies and procedures may result in changes in previously reported segment financial data.

A brief description of each business segment is presented below. A more in-depth discussion of these segments can be found in the Segment Reporting footnote in the Corporation’s 2015 Annual Report on Form 10-K. There have been no changes in the Corporation's segments since December 31, 2015.

The Corporate and Commercial Specialty segment serves a wide range of customers including larger businesses, developers, not-for-profits, municipalities, and financial institutions. The Community, Consumer, and Business segment serves individuals, as well as small and mid-sized businesses. The Risk Management and Shared Services segment includes key shared operational functions and also includes residual revenue and expenses, representing the difference between actual amounts incurred and the amounts allocated to operating segments, including interest rate risk residuals (FTP mismatches) and credit risk and provision residuals (long-term credit charge mismatches).

Information about the Corporation’s segments is presented below.

Segment Income Statement Data
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business			Risk Management and Shared Services			Consolidated Total
Three Months Ended March 31, 2016
Net interest income	$	79,164		$	85,605		$	7,218		$	171,987
Noninterest income	11,613			63,748			7,831			83,192
Total revenue	90,777			149,353			15,049			255,179
Credit provision*	12,739			6,142			1,119			20,000
Noninterest expense	34,403			121,295			18,273			173,971
Income (loss) before income taxes	43,635			21,916			(4,343		)	61,208
Income tax expense (benefit)	14,579			7,670			(3,575		)	18,674
Net income (loss)	$	29,056		$	14,246		$	(768	)	$	42,534
Return on average allocated capital (ROCET1)**	11.3		%	9.1		%	(5.0		)%	8.6		%
Three Months Ended March 31, 2015
Net interest income	$	75,691		$	86,357		$	5,765		$	167,813
Noninterest income	12,613			65,344			1,856			79,813
Total revenue	88,304			151,701			7,621			247,626
Credit provision*	9,526			7,071			(12,097		)	4,500
Noninterest expense	34,460			118,373			21,159			173,992
Income (loss) before income taxes	44,318			26,257			(1,441		)	69,134
Income tax expense (benefit)	15,368			9,190			(2,096		)	22,462
Net income	$	28,950		$	17,067		$	655		$	46,672
Return on average allocated capital (ROCET1)**	12.5		%	10.7		%	(1.1		)%	10.2		%

Segment Balance Sheet Data
($ in Thousands)	Corporate and Commercial Specialty		Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Three Months Ended March 31, 2016
Average earning assets	$	9,720,028	$	9,120,319	$	6,432,026	$	25,272,373
Average loans	9,711,221		9,119,020		92,589		18,922,830
Average deposits	5,918,341		11,100,195		3,556,638		20,575,174
Average allocated capital (CET1)**	$	1,031,659	$	627,211	$	237,611	$	1,896,481
Three Months Ended March 31, 2015
Average earning assets	$	9,218,844	$	8,525,399	$	6,403,783	$	24,148,026
Average loans	9,210,992		8,525,399		78,724		17,815,115
Average deposits	5,421,541		10,522,618		3,111,037		19,055,196
Average allocated capital (CET1)**	$	942,764	$	647,375	$	214,078	$	1,804,217
* The consolidated credit provision is equal to the actual reported provision for credit losses.
** The Federal Reserve establishes capital adequacy requirements for the Corporation, including Tier 1 capital. Tier 1 capital is comprised of common capital and certain redeemable, non-cumulative preferred stock. Average allocated capital represents average common equity Tier 1 which is defined as average Tier 1 capital excluding qualifying perpetual preferred stock and qualifying trust preferred securities. This is a non-GAAP financial measure. For segment reporting purposes, the ROCET1 reflects return on average allocated common equity Tier 1 (“CET1”). The ROCET1 for the Risk Management and Shared Services segment and the Consolidated Total is inclusive of the annualized effect of the preferred stock dividends.

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Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2016

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss)

The following table summarizes the components of accumulated other comprehensive income (loss) at March 31, 2016 and 2015, changes during the three month periods then ended, and reclassifications out of accumulated other comprehensive income (loss) during the three month periods ended March 31, 2016 and 2015, respectively.

($ in Thousands)	Investments Securities Available For Sale			Defined Benefit Pension and Post Retirement Obligations			Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2016	$	459		$	(33,075	)	$	(32,616	)
Other comprehensive income before reclassifications	60,422			—			60,422
Amounts reclassified from accumulated other comprehensive income (loss):
Investment securities gain, net	(3,098		)	—			(3,098		)
Personnel expense	—			495			495
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(1,572		)	—			(1,572		)
Income tax expense	(21,275		)	(189		)	(21,464		)
Net other comprehensive income during period	34,477			306			34,783
Balance March 31, 2016	$	34,936		$	(32,769	)	$	2,167
Balance January 1, 2015	$	18,512		$	(23,362	)	$	(4,850	)
Other comprehensive income before reclassifications	47,418			—			47,418
Amounts reclassified from accumulated other comprehensive income:
Personnel expense	—			545			545
Income tax expense	(18,105		)	(208		)	(18,313		)
Net other comprehensive income during period	29,313			337			29,650
Balance March 31, 2015	$	47,825		$	(23,025	)	$	24,800

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New Accounting Pronouncements Adopted (Policies)

3 Months Ended

Mar. 31, 2016

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

New Accounting Pronouncements Adopted

In September 2015, the FASB issued an amendment to simplify the accounting for measurement adjustments to prior business combinations. The amendment requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The acquirer must record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. The amendment also requires an entity to present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. This amendment was effective for fiscal years beginning after December 15, 2015, including interim periods within those fiscal years. The Corporation adopted the accounting standard during the first quarter of 2016, as required, and with no material impact on its results of operations, financial position, or liquidity.

In May 2015, the FASB issued an amendment to eliminate the requirement to categorize investments measured using the net asset value per share ("NAV") practical expedient in the fair value hierarchy table. Entities will be required to disclose the fair value of investments measured using the NAV practical expedient so that financial statement users can reconcile amounts reported in the fair value hierarchy table to amounts reported on the balance sheet. The Corporation adopted the accounting standard during the first quarter of 2016, as required, with no material impact on its results of operations, financial position, or liquidity.

In April 2015, the FASB issued an amendment to provide guidance to customers about whether a cloud computing arrangement included a software license. If the cloud computing arrangement includes a software license, then the customer should account for the software license element consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. This amendment was effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2015. The Corporation adopted the accounting standard on a prospective basis during the first quarter of 2016, as required, and with no material impact on its results of operations, financial position, or liquidity.

In April 2015, the FASB issued an amendment to simplify the presentation of debt issuance costs. This amendment requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. In August 2015, the FASB expanded this amendment to include SEC staff views related to debt issuance costs associated with line-of-credit arrangements. The SEC staff would not object to an entity deferring and presenting debt issuance costs as an asset and subsequently amortizing the deferred debt issuance costs over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. This amendment required retrospective application and was effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The Corporation adopted the accounting standard during the first quarter of 2016. All prior periods have been restated to reflect this change in presentation, resulting in a $3 million reduction to other assets and a corresponding $3 million reduction to long-term funding on the balance sheet compared to the amounts originally reported at December 31, 2015. See "Consolidated Balance Sheets" and Note 9 for additional information on the reclassification of debt issuance costs.

In February 2015, the FASB issued an amendment to modify existing consolidation guidance for reporting companies that are required to evaluate whether they should consolidate legal entities. The new standard will place more emphasis on risk of loss when determining a controlling financial interest. Frequency in the application of related-party guidance for determining a controlling financial interest will be reduced. Also, consolidation conclusions for public and private companies among several industries that make use of limited partnerships or VIEs will be changed. This amendment was effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The Corporation adopted the accounting standard during the first quarter of 2016, as required, and with no material impact on its results of operations, financial position, or liquidity.

In January 2015, the FASB issued an amendment to eliminate from U.S. GAAP the concept of extraordinary items. Presently, an event or transaction is presumed to be an ordinary and usual activity of the reporting entity unless evidence clearly supports its classification as an extraordinary item. If an event or transaction meets the criteria for extraordinary classification, an entity is required to segregate the extraordinary item from the results of ordinary operations and show the item separately in the income statement, net of tax, after income from continuing operations. This amended guidance will prohibit separate disclosure of extraordinary items in the income statement. This amendment was effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The Corporation adopted the accounting standard during the first quarter of 2016, as required, with no material impact.

In June 2014, the FASB issued an amendment to the stock compensation accounting guidance to clarify that a performance target that affects vesting of a share-based payment and that could be achieved after the requisite service period be treated as a performance condition. As such, the performance target should not be reflected in estimating the grant-date fair value of the award. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the period(s) for which the requisite service has already been rendered. This amendment was effective for annual reporting periods, including interim periods within those annual periods, beginning after December 15, 2015. The Corporation adopted the accounting standard on a prospective basis during the first quarter of 2016, as required, with no material impact on its results of operations, financial position, or liquidity.

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Earnings Per Common Share (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Calculations for basic and diluted earnings per common share

Presented below are the calculations for basic and diluted earnings per common share.

	For the Three Months Ended March 31,
	2016			2015
	(In thousands, except per share data)
Net income	$	42,534		$	46,672
Preferred stock dividends	(2,198		)	(1,228		)
Net income available to common equity	$	40,336		$	45,444
Common shareholder dividends	(16,203		)	(15,166		)
Unvested share-based payment awards	(206		)	(114		)
Undistributed earnings	$	23,927		$	30,164
Undistributed earnings allocated to common shareholders	23,686			29,886
Undistributed earnings allocated to unvested share-based payment awards	241			278
Undistributed earnings	$	23,927		$	30,164
Basic
Distributed earnings to common shareholders	$	16,203		$	15,166
Undistributed earnings allocated to common shareholders	23,686			29,886
Total common shareholders earnings, basic	$	39,889		$	45,052
Diluted
Distributed earnings to common shareholders	$	16,203		$	15,166
Undistributed earnings allocated to common shareholders	23,686			29,886
Total common shareholders earnings, diluted	$	39,889		$	45,052
Weighted average common shares outstanding	148,601			150,070
Effect of dilutive common stock awards	853			1,094
Diluted weighted average common shares outstanding	149,454			151,164
Basic earnings per common share	$	0.27		$	0.30
Diluted earnings per common share	$	0.27		$	0.30

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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Fair value assumptions of stock options

The following assumptions were used in estimating the fair value for options granted in the first three months of 2016 and full year 2015.

	2016		2015
Dividend yield	2.50	%	2.00	%
Risk-free interest rate	2.00	%	2.00	%
Weighted average expected volatility	25.00	%	20.00	%
Weighted average expected life	5.5 years		6.0 years
Weighted average per share fair value of options	$3.36		$3.08

Summary of Company's Stock Option Activities

A summary of the Corporation’s stock option activity for the year ended December 31, 2015, and the three month ended March 31, 2016 is presented below.

Stock Options	Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value (000s)
Outstanding at December 31, 2014	7,847,338		$	18.34
Granted	1,348,504		17.95
Exercised	(1,351,646	)	13.90
Forfeited or expired	(1,215,053	)	29.13
Outstanding at December 31, 2015	6,629,143		$	17.22	6.24	$	18,730
Options Exercisable at December 31, 2015	4,190,245		$	17.25	4.93	$	14,873
Granted	1,302,298		$	17.45
Exercised	(96,602	)	13.60
Forfeited or expired	(48,190	)	17.75
Outstanding at March 31, 2016	7,786,649		$	17.30	6.61	$	14,682
Options Exercisable at March 31, 2016	4,907,257		$	17.22	5.18	$	12,950

Summary of Company's Nonvested Stock Option Activities

The following table summarizes information about the Corporation’s nonvested stock option activity for the year ended December 31, 2015, and for the three months ended March 31, 2016.

Nonvested Stock Options	Shares		Weighted Average Grant Date Fair Value
Nonvested at December 31, 2014	2,770,662		$	3.74
Granted	1,348,504		3.08
Vested	(1,459,709	)	4.19
Forfeited	(220,559	)	3.28
Nonvested at December 31, 2015	2,438,898		$	3.15
Granted	1,302,298		3.36
Vested	(813,614	)	3.25
Forfeited	(48,190	)	3.20
Nonvested at March 31, 2016	2,879,392		$	3.21

Summary of Restricted Stock Awards Activity (Excluding Salary Shares)

The following table summarizes information about the Corporation’s restricted stock activity for the year ended December 31, 2015, and for the three months ended March 31, 2016.

Restricted Stock	Shares		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2014	1,982,126		$	15.79
Granted	1,173,847		18.09
Vested	(709,582	)	15.62
Forfeited	(196,363	)	16.87
Outstanding at December 31, 2015	2,250,028		$	17.03
Granted	1,041,985		16.37
Vested	(732,553	)	16.46
Forfeited	(34,299	)	17.69
Outstanding at March 31, 2016	2,525,161		$	16.91

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Investment Securities (Tables)

3 Months Ended

Mar. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Investment securities available for sale

The amortized cost and fair values of securities available for sale and held to maturity were as follows.

March 31, 2016	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
U. S. Treasury securities	$	1,000	$	—	$	—		$	1,000
Residential mortgage-related securities:
FNMA / FHLMC	1,268,929		35,321		(846		)	1,303,404
GNMA	1,536,248		11,086		(79		)	1,547,255
Private-label	1,535		—		(23		)	1,512
GNMA commercial mortgage-related securities	2,053,540		5,855		(11,530		)	2,047,865
Other securities (debt and equity)	4,718		87		—			4,805
Total investment securities available for sale	$	4,865,970	$	52,349	$	(12,478	)	$	4,905,841
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	$	1,054,757	$	25,972	$	(146	)	$	1,080,583
Residential mortgage-related securities:
FNMA / FHLMC	40,404		797		(180		)	41,021
GNMA	81,660		1,086		(5		)	82,741
Total investment securities held to maturity	$	1,176,821	$	27,855	$	(331	)	$	1,204,345

December 31, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
U. S. Treasury securities	$	999	$	—	$	(2	)	$	997
Residential mortgage-related securities:
FNMA / FHLMC	1,388,995		33,791		(8,160		)	1,414,626
GNMA	1,605,956		507		(16,460		)	1,590,003
Private-label	1,722		1		(14		)	1,709
GNMA commercial mortgage-related securities	1,982,477		1,334		(28,501		)	1,955,310
Other securities (debt and equity)	4,718		51		—			4,769
Total investment securities available for sale	$	4,984,867	$	35,684	$	(53,137	)	$	4,967,414
Investment securities held to maturity:
Municipal securities	$	1,043,767	$	16,803	$	(339	)	$	1,060,231
Residential mortgage-related securities:
FNMA / FHLMC	41,469		513		(645		)	41,337
GNMA	82,994		189		(309		)	82,874
Total investment securities held to maturity	$	1,168,230	$	17,505	$	(1,293	)	$	1,184,442

Investment securities held to maturity

The amortized cost and fair values of securities available for sale and held to maturity were as follows.

March 31, 2016	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
U. S. Treasury securities	$	1,000	$	—	$	—		$	1,000
Residential mortgage-related securities:
FNMA / FHLMC	1,268,929		35,321		(846		)	1,303,404
GNMA	1,536,248		11,086		(79		)	1,547,255
Private-label	1,535		—		(23		)	1,512
GNMA commercial mortgage-related securities	2,053,540		5,855		(11,530		)	2,047,865
Other securities (debt and equity)	4,718		87		—			4,805
Total investment securities available for sale	$	4,865,970	$	52,349	$	(12,478	)	$	4,905,841
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	$	1,054,757	$	25,972	$	(146	)	$	1,080,583
Residential mortgage-related securities:
FNMA / FHLMC	40,404		797		(180		)	41,021
GNMA	81,660		1,086		(5		)	82,741
Total investment securities held to maturity	$	1,176,821	$	27,855	$	(331	)	$	1,204,345

December 31, 2015	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
U. S. Treasury securities	$	999	$	—	$	(2	)	$	997
Residential mortgage-related securities:
FNMA / FHLMC	1,388,995		33,791		(8,160		)	1,414,626
GNMA	1,605,956		507		(16,460		)	1,590,003
Private-label	1,722		1		(14		)	1,709
GNMA commercial mortgage-related securities	1,982,477		1,334		(28,501		)	1,955,310
Other securities (debt and equity)	4,718		51		—			4,769
Total investment securities available for sale	$	4,984,867	$	35,684	$	(53,137	)	$	4,967,414
Investment securities held to maturity:
Municipal securities	$	1,043,767	$	16,803	$	(339	)	$	1,060,231
Residential mortgage-related securities:
FNMA / FHLMC	41,469		513		(645		)	41,337
GNMA	82,994		189		(309		)	82,874
Total investment securities held to maturity	$	1,168,230	$	17,505	$	(1,293	)	$	1,184,442

Amortized cost and fair values of investment securities available for sale by contractual maturity

The amortized cost and fair values of investment securities available for sale and held to maturity at March 31, 2016, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Available for Sale					Held to Maturity
($ in Thousands)	Amortized Cost		Fair Value			Amortized Cost		Fair Value
Due in one year or less	$	2,500	$	2,530		$	46,749	$	32,151
Due after one year through five years	3,200		3,200			243,423		255,338
Due after five years through ten years	—		—			245,683		255,755
Due after ten years	—		—			518,902		537,339
Total debt securities	5,700		5,730			1,054,757		1,080,583
Residential mortgage-related securities:
FNMA / FHLMC	1,268,929		1,303,404			40,404		41,021
GNMA	1,536,248		1,547,255			81,660		82,741
Private-label	1,535		1,512			—		—
GNMA commercial mortgage-related securities	2,053,540		2,047,865			—		—
Equity securities	18		75			—		—
Total investment securities	$	4,865,970	$	4,905,841		$	1,176,821	$	1,204,345
Ratio of Fair Value to Amortized Cost			100.8		%			102.3		%

Realized gains and losses and proceeds from sale

During the first three months of 2016, the Corporation continued to restructure its investment securities portfolio and sold approximately $119 million of FNMA and FHLMC mortgage-related securities and reinvested into GNMA mortgage-related securities, generating a $3 million net gain on sale. This restructuring lowered risk weighted assets and related capital requirements.

	Three Months Ended March 31,
	2016			2015
	($ in Thousands)
Gross gains	$	3,287		$	—
Gross losses	(189		)	—
Investment securities gains, net	$	3,098		$	—
Proceeds from sales of investment securities	$	119,379		$	289

Unrealized losses and fair value of available for sale and held to maturity securities, by investment category and time length

The following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at March 31, 2016.

	Less than 12 months						12 months or more						Total
March 31, 2016	Number of Securities	Unrealized Losses			Fair Value		Number of Securities	Unrealized Losses			Fair Value		Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
Residential mortgage-related securities:
FNMA / FHLMC	—	$	—		$	—	12	$	(846	)	$	258,670	$	(846	)	$	258,670
GNMA	2	(79		)	41,913		—	—			—		(79		)	41,913
Private-label	1	(1		)	76		3	(22		)	1,382		(23		)	1,458
GNMA commercial mortgage-related securities	20	(1,390		)	558,620		21	(10,140		)	448,861		(11,530		)	1,007,481
Total	23	$	(1,470	)	$	600,609	36	$	(11,008	)	$	708,913	$	(12,478	)	$	1,309,522
Investment securities held to maturity:
Municipal securities	20	$	(75	)	$	10,029	17	$	(71	)	$	5,599	$	(146	)	$	15,628
Residential mortgage-related securities:
FNMA / FHLMC	1	(3		)	1,180		5	(177		)	13,587		(180		)	14,767
GNMA	—	—			—		1	(5		)	1,548		(5		)	1,548
Total	21	$	(78	)	$	11,209	23	$	(253	)	$	20,734	$	(331	)	$	31,943

For comparative purposes, the following represents gross unrealized losses and the related fair value of investment securities available for sale and held to maturity, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2015.

	Less than 12 months						12 months or more						Total
December 31, 2015	Number of Securities	Unrealized Losses			Fair Value		Number of Securities	Unrealized Losses			Fair Value		Unrealized Losses			Fair Value
	($ in Thousands)
Investment securities available for sale:
U.S. Treasury securities	1	$	(2	)	$	997	—	$	—		$	—	$	(2	)	$	997
Residential mortgage-related securities:
FNMA / FHLMC	17	(1,548		)	220,852		14	(6,612		)	338,186		(8,160		)	559,038
GNMA	46	(16,460		)	1,434,484		—	—			—		(16,460		)	1,434,484
Private-label	1	(1		)	83		3	(13		)	1,565		(14		)	1,648
GNMA commercial mortgage-related securities	40	(9,610		)	1,132,844		21	(18,891		)	448,218		(28,501		)	1,581,062
Total	105	$	(27,621	)	$	2,789,260	38	$	(25,516	)	$	787,969	$	(53,137	)	$	3,577,229
Investment securities held to maturity:
Municipal securities	53	$	(146	)	$	23,137	24	$	(193	)	$	9,254	$	(339	)	$	32,391
Residential mortgage-related securities:
FNMA / FHLMC	10	(177		)	12,754		3	(468		)	11,106		(645		)	23,860
GNMA	21	(201		)	45,499		3	(108		)	6,797		(309		)	52,296
Total	84	$	(524	)	$	81,390	30	$	(769	)	$	27,157	$	(1,293	)	$	108,547

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Loans (Tables)

3 Months Ended

Mar. 31, 2016

Receivables [Abstract]

Loan composition

The period end loan composition was as follows.

	March 31, 2016		December 31, 2015
	($ in Thousands)
Commercial and industrial	$	6,511,648	$	6,190,683
Commercial real estate — owner occupied	917,285		918,212
Commercial and business lending	7,428,933		7,108,895
Commercial real estate — investor	3,276,733		3,234,266
Real estate construction	1,184,398		1,162,145
Commercial real estate lending	4,461,131		4,396,411
Total commercial	11,890,064		11,505,306
Residential mortgage	5,944,457		5,783,267
Home equity	982,994		1,005,802
Other consumer	409,725		419,968
Total consumer	7,337,176		7,209,037
Total loans	$	19,227,240	$	18,714,343

Commercial and Consumer loans by credit quality indicator

The following table presents commercial and consumer loans by credit quality indicator at March 31, 2016.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	5,713,979	$	272,090	$	328,464	$	197,115	$	6,511,648
Commercial real estate - owner occupied	834,879		31,856		41,107		9,443		917,285
Commercial and business lending	6,548,858		303,946		369,571		206,558		7,428,933
Commercial real estate - investor	3,208,338		30,680		25,385		12,330		3,276,733
Real estate construction	1,180,914		222		2,422		840		1,184,398
Commercial real estate lending	4,389,252		30,902		27,807		13,170		4,461,131
Total commercial	10,938,110		334,848		397,378		219,728		11,890,064
Residential mortgage	5,883,743		5,014		3,488		52,212		5,944,457
Home equity	967,267		1,446		209		14,072		982,994
Other consumer	408,819		523		—		383		409,725
Total consumer	7,259,829		6,983		3,697		66,667		7,337,176
Total	$	18,197,939	$	341,831	$	401,075	$	286,395	$	19,227,240

The following table presents commercial and consumer loans by credit quality indicator at December 31, 2015.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	5,522,809	$	341,169	$	233,130	$	93,575	$	6,190,683
Commercial real estate - owner occupied	835,572		38,885		35,706		8,049		918,212
Commercial and business lending	6,358,381		380,054		268,836		101,624		7,108,895
Commercial real estate - investor	3,153,703		45,976		25,944		8,643		3,234,266
Real estate construction	1,157,034		252		3,919		940		1,162,145
Commercial real estate lending	4,310,737		46,228		29,863		9,583		4,396,411
Total commercial	10,669,118		426,282		298,699		111,207		11,505,306
Residential mortgage	5,727,437		1,552		2,796		51,482		5,783,267
Home equity	988,574		1,762		222		15,244		1,005,802
Other consumer	419,087		556		—		325		419,968
Total consumer	7,135,098		3,870		3,018		67,051		7,209,037
Total	$	17,804,216	$	430,152	$	301,717	$	178,258	$	18,714,343

Summarized details of Loans

The following table presents loans by past due status at March 31, 2016.

	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due (a)		Nonaccrual (b)		Total
	($ in Thousands)
Commercial and industrial	$	6,311,415	$	2,665	$	236	$	217	$	197,115	$	6,511,648
Commercial real estate - owner occupied	907,322		520		—		—		9,443		917,285
Commercial and business lending	7,218,737		3,185		236		217		206,558		7,428,933
Commercial real estate - investor	3,263,331		748		324		—		12,330		3,276,733
Real estate construction	1,183,143		415		—		—		840		1,184,398
Commercial real estate lending	4,446,474		1,163		324		—		13,170		4,461,131
Total commercial	11,665,211		4,348		560		217		219,728		11,890,064
Residential mortgage	5,888,651		3,199		395		—		52,212		5,944,457
Home equity	963,118		4,410		1,394		—		14,072		982,994
Other consumer	406,248		1,020		662		1,412		383		409,725
Total consumer	7,258,017		8,629		2,451		1,412		66,667		7,337,176
Total	$	18,923,228	$	12,977	$	3,011	$	1,629	$	286,395	$	19,227,240

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at March 31, 2016 (the same as the reported balances for the accruing loans noted above).

(b) Of the total nonaccrual loans,$230 million or 80% were current with respect to payment at March 31, 2016.

The following table presents loans by past due status at December 31, 2015.

	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due (a)		Nonaccrual (b)		Total
	($ in Thousands)
Commercial and industrial	$	6,095,848	$	602	$	409	$	249	$	93,575	$	6,190,683
Commercial real estate - owner occupied	903,021		7,142		—		—		8,049		918,212
Commercial and business lending	6,998,869		7,744		409		249		101,624		7,108,895
Commercial real estate - investor	3,225,332		291		—		—		8,643		3,234,266
Real estate construction	1,160,909		270		26		—		940		1,162,145
Commercial real estate lending	4,386,241		561		26		—		9,583		4,396,411
Total commercial	11,385,110		8,305		435		249		111,207		11,505,306
Residential mortgage	5,726,855		4,491		439		—		51,482		5,783,267
Home equity	982,639		6,190		1,729		—		15,244		1,005,802
Other consumer	416,374		1,195		675		1,399		325		419,968
Total consumer	7,125,868		11,876		2,843		1,399		67,051		7,209,037
Total	$	18,510,978	$	20,181	$	3,278	$	1,648	$	178,258	$	18,714,343

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2015 (the same as the reported balances for the accruing loans noted above).

(b) Of the total nonaccrual loans,$124 million or 69% were current with respect to payment at December 31, 2015.

Summarized details of impaired Loans

The following table presents impaired loans at March 31, 2016.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	105,780	$	106,837	$	14,595	$	106,280	$	613
Commercial real estate — owner occupied	10,477		10,596		554		10,552		89
Commercial and business lending	116,257		117,433		15,149		116,832		702
Commercial real estate — investor	23,494		24,430		1,244		23,541		461
Real estate construction	1,226		1,812		412		1,237		14
Commercial real estate lending	24,720		26,242		1,656		24,778		475
Total commercial	140,977		143,675		16,805		141,610		1,177
Residential mortgage	65,281		70,624		12,351		65,819		548
Home equity	20,337		22,451		9,732		20,504		248
Other consumer	1,276		1,332		221		1,291		8
Total consumer	86,894		94,407		22,304		87,614		804
Total loans(a)	$	227,871	$	238,082	$	39,109	$	229,224	$	1,981
Loans with no related allowance
Commercial and industrial	$	120,243	$	130,935	$	—	$	120,399	$	91
Commercial real estate — owner occupied	6,659		9,005		—		6,715		—
Commercial and business lending	126,902		139,940		—		127,114		91
Commercial real estate — investor	9,829		9,984		—		9,855		—
Real estate construction	—		—		—		—		—
Commercial real estate lending	9,829		9,984		—		9,855		—
Total commercial	136,731		149,924		—		136,969		91
Residential mortgage	6,738		7,020		—		6,841		35
Home equity	652		652		—		653		10
Other consumer	—		—		—		—		—
Total consumer	7,390		7,672		—		7,494		45
Total loans(a)	$	144,121	$	157,596	$	—	$	144,463	$	136
Total
Commercial and industrial	$	226,023	$	237,772	$	14,595	$	226,679	$	704
Commercial real estate — owner occupied	17,136		19,601		554		17,267		89
Commercial and business lending	243,159		257,373		15,149		243,946		793
Commercial real estate — investor	33,323		34,414		1,244		33,396		461
Real estate construction	1,226		1,812		412		1,237		14
Commercial real estate lending	34,549		36,226		1,656		34,633		475
Total commercial	277,708		293,599		16,805		278,579		1,268
Residential mortgage	72,019		77,644		12,351		72,660		583
Home equity	20,989		23,103		9,732		21,157		258
Other consumer	1,276		1,332		221		1,291		8
Total consumer	94,284		102,079		22,304		95,108		849
Total loans(a)	$	371,992	$	395,678	$	39,109	$	373,687	$	2,117

(a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 84% of the unpaid principal balance at March 31, 2016.

The following table presents impaired loans at December 31, 2015.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	57,785	$	59,409	$	8,162	$	46,833	$	855
Commercial real estate — owner occupied	9,705		9,804		448		10,087		412
Commercial and business lending	67,490		69,213		8,610		56,920		1,267
Commercial real estate — investor	27,822		29,444		1,831		28,278		1,914
Real estate construction	1,450		2,154		453		1,667		66
Commercial real estate lending	29,272		31,598		2,284		29,945		1,980
Total commercial	96,762		100,811		10,894		86,865		3,247
Residential mortgage	66,590		71,084		12,462		68,183		2,374
Home equity	21,769		23,989		10,118		22,624		1,147
Other consumer	1,154		1,225		195		1,199		30
Total consumer	89,513		96,298		22,775		92,006		3,551
Total loans(a)	$	186,275	$	197,109	$	33,669	$	178,871	$	6,798
Loans with no related allowance
Commercial and industrial	$	65,083	$	72,259	$	—	$	79,573	$	1,657
Commercial real estate — owner occupied	6,221		6,648		—		6,534		15
Commercial and business lending	71,304		78,907		—		86,107		1,672
Commercial real estate — investor	2,736		2,840		—		2,763		90
Real estate construction	—		—		—		—		—
Commercial real estate lending	2,736		2,840		—		2,763		90
Total commercial	74,040		81,747		—		88,870		1,762
Residential mortgage	4,762		5,033		—		4,726		126
Home equity	544		544		—		544		30
Other consumer	—		—		—		—		—
Total consumer	5,306		5,577		—		5,270		156
Total loans(a)	$	79,346	$	87,324	$	—	$	94,140	$	1,918
Total
Commercial and industrial	$	122,868	$	131,668	$	8,162	$	126,406	$	2,512
Commercial real estate — owner occupied	15,926		16,452		448		16,621		427
Commercial and business lending	138,794		148,120		8,610		143,027		2,939
Commercial real estate — investor	30,558		32,284		1,831		31,041		2,004
Real estate construction	1,450		2,154		453		1,667		66
Commercial real estate lending	32,008		34,438		2,284		32,708		2,070
Total commercial	170,802		182,558		10,894		175,735		5,009
Residential mortgage	71,352		76,117		12,462		72,909		2,500
Home equity	22,313		24,533		10,118		23,168		1,177
Other consumer	1,154		1,225		195		1,199		30
Total consumer	94,819		101,875		22,775		97,276		3,707
Total loans(a)	$	265,621	$	284,433	$	33,669	$	273,011	$	8,716

(a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 82% of the unpaid principal balance at December 31, 2015.

Nonaccrual and Performing Restructured Loans

The following table presents nonaccrual and performing restructured loans by loan portfolio.

	March 31, 2016				December 31, 2015
	Performing Restructured Loans		Nonaccrual Restructured Loans(a)		Performing Restructured Loans		Nonaccrual Restructured Loans(a)
	($ in Thousands)
Commercial and industrial	$	28,908	$	2,711	$	29,293	$	1,714
Commercial real estate — owner occupied	7,693		2,689		7,877		2,703
Commercial real estate — investor	20,993		1,356		21,915		3,936
Real estate construction	386		182		510		177
Residential mortgage	19,807		23,845		19,870		24,592
Home equity	6,917		4,416		7,069		4,522
Other consumer	893		33		829		40
Total	$	85,597	$	35,232	$	87,363	$	37,684

(a) Nonaccrual restructured loans have been included within nonaccrual loans.

Summary of Restructured Loans

The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio during the three months ended March 31, 2016 and 2015, respectively, and the recorded investment and unpaid principal balance as of March 31, 2016 and 2015 respectively.

	Three Months Ended March 31, 2016					Three Months Ended March 31, 2015
	Number of Loans	Recorded Investment(a)		Unpaid Principal Balance(b)		Number of Loans	Recorded Investment(a)		Unpaid Principal Balance(b)
	($ in Thousands)
Commercial and industrial	7	$	1,483	$	1,522	2	$	196	$	208
Commercial real estate — owner occupied	1	125		130		5	3,585		3,641
Commercial real estate — investor	—	—		—		4	3,030		3,042
Real estate construction	1	10		55		—	—		—
Residential mortgage	30	2,062		2,124		30	2,816		2,864
Home equity	20	818		879		36	1,782		1,843
Total	59	$	4,498	$	4,710	77	$	11,409	$	11,598

(a) Represents post-modification outstanding recorded investment.

(b) Represents pre-modification outstanding recorded investment.

Troubled debt restructurings subsequent redefault

The following table provides the number of loans modified in a troubled debt restructuring during the previous twelve months which subsequently defaulted during the three months ended March 31, 2016 and 2015, respectively, as well as the recorded investment in these restructured loans as of March 31, 2016 and 2015 respectively.

	Three Months Ended March 31, 2016			Three Month Ended March 31, 2015
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	($ in Thousands)
Commercial real estate — owner occupied	—	$	—	1	$	297
Real estate construction	1	10		—	—
Residential mortgage	7	1,151		16	1,239
Home equity	8	153		24	855
Total	16	$	1,314	41	$	2,391

Changes in the allowance for loan losses by portfolio segment

A summary of the changes in the allowance for loan losses by portfolio segment for the three months ended March 31, 2016, was as follows.

$ in Thousands	Commercial and industrial			Commercial real estate - owner occupied			Commercial real estate - investor			Real estate construction			Residential mortgage			Home equity			Other consumer			Total
December 31, 2015	$	129,959		$	18,680		$	43,018		$	25,266		$	28,261		$	23,555		$	5,525		$	274,264
Charge offs	(16,894		)	(76		)	(176		)	(54		)	(1,390		)	(1,746		)	(909		)	(21,245		)
Recoveries	1,958			33			1,415			26			158			600			161			4,351
Net charge offs	(14,936		)	(43		)	1,239			(28		)	(1,232		)	(1,146		)	(748		)	(16,894		)
Provision for loan losses	24,470			(2,059		)	(2,233		)	(3,498		)	2,030			721			569			20,000
March 31, 2016	$	139,493		$	16,578		$	42,024		$	21,740		$	29,059		$	23,130		$	5,346		$	277,370
Allowance for loan losses:
Individually evaluated for impairment	$	14,005		$	74		$	—		$	—		$	14		$	—		$	—		$	14,093
Collectively evaluated for impairment	125,488			16,504			42,024			21,740			29,045			23,130			5,346			263,277
Total allowance for loan losses	$	139,493		$	16,578		$	42,024		$	21,740		$	29,059		$	23,130		$	5,346		$	277,370
Loans:
Individually evaluated for impairment	$	195,341		$	7,500		$	9,829		$	—		$	7,472		$	652		$	—		$	220,794
Collectively evaluated for impairment	6,316,307			909,785			3,266,904			1,184,398			5,936,985			982,342			409,725			19,006,446
Total loans	$	6,511,648		$	917,285		$	3,276,733		$	1,184,398		$	5,944,457		$	982,994		$	409,725		$	19,227,240

For comparison purposes, a summary of the changes in the allowance for loan losses by portfolio segment for the year ended December 31, 2015, was as follows.

$ in Thousands	Commercial and industrial			Commercial real estate - owner occupied			Commercial real estate - investor			Real estate construction			Residential mortgage			Home equity			Other consumer			Total
December 31, 2014	$	117,635		$	16,510		$	46,333		$	20,999		$	31,926		$	26,464		$	6,435		$	266,302
Charge offs	(27,687		)	(2,645		)	(4,645		)	(750		)	(5,636		)	(7,048		)	(3,869		)	(52,280		)
Recoveries	9,821			921			4,157			2,268			1,077			3,233			765			22,242
Net charge offs	(17,866		)	(1,724		)	(488		)	1,518			(4,559		)	(3,815		)	(3,104		)	(30,038		)
Provision for loan losses	30,190			3,894			(2,827		)	2,749			894			906			2,194			38,000
December 31, 2015	$	129,959		$	18,680		$	43,018		$	25,266		$	28,261		$	23,555		$	5,525		$	274,264
Allowance for loan losses:
Individually evaluated for impairment	$	7,522		$	—		$	229		$	—		$	166		$	46		$	—		$	7,963
Collectively evaluated for impairment	122,437			18,680			42,789			25,266			28,095			23,509			5,525			266,301
Total allowance for loan losses	$	129,959		$	18,680		$	43,018		$	25,266		$	28,261		$	23,555		$	5,525		$	274,264
Loans:
Individually evaluated for impairment	$	91,569		$	6,221		$	5,460		$	—		$	6,956		$	1,281		$	—		$	111,487
Collectively evaluated for impairment	6,099,114			911,991			3,228,806			1,162,145			5,776,311			1,004,521			419,968			18,602,856
Total loans	$	6,190,683		$	918,212		$	3,234,266		$	1,162,145		$	5,783,267		$	1,005,802		$	419,968		$	18,714,343

Changes in the allowance for unfunded commitments

A summary of the changes in the allowance for unfunded commitments was as follows.

	Three Months Ended March 31, 2016		Year Ended December 31, 2015
	($ in Thousands)
Allowance for Unfunded Commitments:
Balance at beginning of period	$	24,400	$	24,900
Provision for unfunded commitments	—		(500		)
Balance at end of period	$	24,400	$	24,400

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Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets Disclosure [Text Block]

Goodwill and Other Intangible Assets

Goodwill:  Goodwill is not amortized but, instead, is subject to impairment tests on at least an annual basis, and more frequently if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The impairment testing process is conducted by assigning net assets and goodwill to each reporting unit. An initial qualitative evaluation is made to assess the likelihood of impairment and determine whether further quantitative testing to calculate the fair value is necessary. When the qualitative evaluation indicates that impairment is more likely than not, quantitative testing is required whereby the fair value of each reporting unit is calculated and compared to the recorded book value, “step one.” If the calculated fair value of the reporting unit exceeds its carrying value, goodwill is not considered impaired and “step two” is not considered necessary. If the carrying value of a reporting unit exceeds its calculated fair value, the impairment test continues (“step two”) by comparing the carrying value of the reporting unit’s goodwill to the implied fair value of goodwill. The implied fair value is computed by adjusting all assets and liabilities of the reporting unit to current fair value with the offset adjustment to goodwill. The adjusted goodwill balance is the implied fair value of the goodwill. An impairment charge is recognized if the carrying value of goodwill exceeds the implied fair value of goodwill.

The Corporation conducted its most recent annual impairment testing in May 2015, utilizing a qualitative assessment. Factors that management considered in this assessment included macroeconomic conditions, industry and market considerations, overall financial performance of the Corporation and each reporting unit (both current and projected), changes in management strategy, and changes in the composition or carrying amount of net assets. In addition, management considered the changes in both the Corporation’s common stock price and in the overall bank common stock index (based on the S&P 400 Regional Bank Sub-Industry Index), as well as the Corporation’s earnings per common share trend over the past year. Based on these assessments, management concluded that the 2015 annual qualitative impairment assessment indicated that it is more likely than not that the estimated fair value exceeded the carrying value (including goodwill) for each reporting unit. Therefore, a step one quantitative analysis was not required. There were no events since the May 2015 impairment testing that have changed the Corporation's impairment assessment conclusion. There were no impairment charges recorded in 2015 or the first three months of 2016.

At March 31, 2016, the Corporation had goodwill of $972 million, compared to $969 million at December 31, 2015. Goodwill increased by approximately $3 million during the first quarter of 2016 as a result of two small insurance acquisitions. See Note 2 for additional information on the Corporation's acquisitions.

Other Intangible Assets:  The Corporation has other intangible assets that are amortized, consisting of core deposit intangibles, other intangibles (primarily related to customer relationships acquired in connection with the Corporation’s insurance agency acquisitions), and mortgage servicing rights. Core deposit intangibles of approximately $15 million were fully amortized in 2015 and have been removed from both the gross carrying amount and the accumulated amortization for 2016. Other intangibles increased by approximately $1 million during the first quarter of 2016 for the customer relationships associated with two small insurance acquisitions. See Note 2 for additional information on the Corporation's acquisitions. For core deposit intangibles and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows.

	Three Months Ended March 31, 2016			Year Ended  December 31, 2015
	($ in Thousands)
Core deposit intangibles:
Gross carrying amount	$	4,385		$	19,545
Accumulated amortization	(4,062		)	(19,152		)
Net book value	$	323		$	393
Amortization during the year	$	70		$	1,404
Other intangibles:
Gross carrying amount	$	32,410		$	31,398
Accumulated amortization	(15,767		)	(15,333		)
Net book value	$	16,643		$	16,065
Additions during the period	$	1,012		$	12,115
Amortization during the year	$	434		$	1,690

The Corporation sells residential mortgage loans in the secondary market and typically retains the right to service the loans sold. Mortgage servicing rights are amortized in proportion to and over the period of estimated net servicing income, and assessed for impairment at each reporting date.

The Corporation periodically evaluates its mortgage servicing rights asset for impairment. Impairment is assessed based on fair value at each reporting date using estimated prepayment speeds of the underlying mortgage loans serviced and stratifications based on the risk characteristics of the underlying loans (predominantly loan type and note interest rate). As mortgage interest rates fall, prepayment speeds are usually faster and the value of the mortgage servicing rights asset generally decreases, requiring additional valuation reserve. Conversely, as mortgage interest rates rise, prepayment speeds are usually slower and the value of the mortgage servicing rights asset generally increases, requiring less valuation reserve. A valuation allowance is established, through a charge to earnings, to the extent the amortized cost of the mortgage servicing rights exceeds the estimated fair value by stratification. If it is later determined that all or a portion of the temporary impairment no longer exists for a stratification, the valuation is reduced through a recovery to earnings. An other-than-temporary impairment (i.e., recoverability is considered remote when considering interest rates and loan pay off activity) is recognized as a write-down of the mortgage servicing rights asset and the related valuation allowance (to the extent a valuation allowance is available) and then against earnings. A direct write-down permanently reduces the carrying value of the mortgage servicing rights asset and valuation allowance, precluding subsequent recoveries. See Note 12 for a discussion of the recourse provisions on sold residential mortgage loans. See Note 13 which further discusses fair value measurement relative to the mortgage servicing rights asset.

A summary of changes in the balance of the mortgage servicing rights asset and the mortgage servicing rights valuation allowance was as follows.

	Three Months Ended  March 31, 2016			Year Ended December 31, 2015
	($ in Thousands)
Mortgage servicing rights
Mortgage servicing rights at beginning of period	$	62,150		$	61,379
Additions	1,856			12,372
Amortization	(2,874		)	(11,601		)
Mortgage servicing rights at end of period	$	61,132		$	62,150
Valuation allowance at beginning of period	(809		)	(1,234		)
(Additions) recoveries, net	(909		)	425
Valuation allowance at end of period	(1,718		)	(809		)
Mortgage servicing rights, net	$	59,414		$	61,341
Fair value of mortgage servicing rights	$	61,410		$	70,686
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$	7,876,888		$	7,915,224
Mortgage servicing rights, net to servicing portfolio	0.75		%	0.77		%
Mortgage servicing rights expense (1)	$	3,783		$	11,176

(1) Includes the amortization of mortgage servicing rights and additions / recoveries to the valuation allowance of mortgage servicing rights, and is a component of mortgage banking, net in the consolidated statements of income.

The following table shows the estimated future amortization expense for amortizing intangible assets. The projections of amortization expense are based on existing asset balances, the current interest rate environment, and prepayment speeds as of March 31, 2016. The actual amortization expense the Corporation recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements, and events or circumstances that indicate the carrying amount of an asset may not be recoverable.

Estimated Amortization Expense	Core Deposit Intangibles		Other Intangibles		Mortgage Servicing Rights
	($ in Thousands)
Nine months ending December 31, 2016	$	211	$	1,378	$	8,850
2017	112		1,786		9,674
2018	—		1,756		7,761
2019	—		1,457		6,313
2020	—		1,340		5,169
2021	—		1,316		4,265
Beyond 2021	—		7,610		19,100
Total Estimated Amortization Expense	$	323	$	16,643	$	61,132

Summary of core deposit intangibles and other intangibles

For core deposit intangibles and other intangibles, changes in the gross carrying amount, accumulated amortization, and net book value were as follows.

	Three Months Ended March 31, 2016			Year Ended  December 31, 2015
	($ in Thousands)
Core deposit intangibles:
Gross carrying amount	$	4,385		$	19,545
Accumulated amortization	(4,062		)	(19,152		)
Net book value	$	323		$	393
Amortization during the year	$	70		$	1,404
Other intangibles:
Gross carrying amount	$	32,410		$	31,398
Accumulated amortization	(15,767		)	(15,333		)
Net book value	$	16,643		$	16,065
Additions during the period	$	1,012		$	12,115
Amortization during the year	$	434		$	1,690

Summary of changes in balance of mortgage servicing rights asset and mortgage servicing rights valuation allowance

A summary of changes in the balance of the mortgage servicing rights asset and the mortgage servicing rights valuation allowance was as follows.

	Three Months Ended  March 31, 2016			Year Ended December 31, 2015
	($ in Thousands)
Mortgage servicing rights
Mortgage servicing rights at beginning of period	$	62,150		$	61,379
Additions	1,856			12,372
Amortization	(2,874		)	(11,601		)
Mortgage servicing rights at end of period	$	61,132		$	62,150
Valuation allowance at beginning of period	(809		)	(1,234		)
(Additions) recoveries, net	(909		)	425
Valuation allowance at end of period	(1,718		)	(809		)
Mortgage servicing rights, net	$	59,414		$	61,341
Fair value of mortgage servicing rights	$	61,410		$	70,686
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$	7,876,888		$	7,915,224
Mortgage servicing rights, net to servicing portfolio	0.75		%	0.77		%
Mortgage servicing rights expense (1)	$	3,783		$	11,176

(1) Includes the amortization of mortgage servicing rights and additions / recoveries to the valuation allowance of mortgage servicing rights, and is a component of mortgage banking, net in the consolidated statements of income.

Summary of estimated future amortization expense

The following table shows the estimated future amortization expense for amortizing intangible assets. The projections of amortization expense are based on existing asset balances, the current interest rate environment, and prepayment speeds as of March 31, 2016. The actual amortization expense the Corporation recognizes in any given period may be significantly different depending upon acquisition or sale activities, changes in interest rates, prepayment speeds, market conditions, regulatory requirements, and events or circumstances that indicate the carrying amount of an asset may not be recoverable.

Estimated Amortization Expense	Core Deposit Intangibles		Other Intangibles		Mortgage Servicing Rights
	($ in Thousands)
Nine months ending December 31, 2016	$	211	$	1,378	$	8,850
2017	112		1,786		9,674
2018	—		1,756		7,761
2019	—		1,457		6,313
2020	—		1,340		5,169
2021	—		1,316		4,265
Beyond 2021	—		7,610		19,100
Total Estimated Amortization Expense	$	323	$	16,643	$	61,132

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Short and Long-Term Funding (Tables)

3 Months Ended

Mar. 31, 2016

Debt Disclosure [Abstract]

Breakdown of short & long-term debt balances

The components of short-term funding (funding with original contractual maturities of one year or less) and long-term funding (funding with original contractual maturities greater than one year) were as follows.

	March 31, 2016			December 31, 2015
	($ in Thousands)
Short-Term Funding
Federal funds purchased	$	74,985		$	47,870
Securities sold under agreements to repurchase	508,262			383,568
Federal funds purchased and securities sold under agreements to repurchase	$	583,247		$	431,438
FHLB advances	770,000			335,000
Commercial paper	64,161			67,978
Other short-term funding	834,161			402,978
Total short-term funding	$	1,417,408		$	834,416
Long-Term Funding
FHLB advances	$	2,365,216		$	1,750,225
Senior notes, at par	250,000			680,000
Subordinated notes, at par	250,000			250,000
Other long-term funding and capitalized costs (1)	(3,900		)	(4,061		)
Total long-term funding	2,861,316			2,676,164
Total short and long-term funding	$	4,278,724		$	3,510,580
(1) Debt issuance costs are now reflected on the balance sheet with the related debt issued rather than within other assets.  See Note 3 for additional information on this new accounting standard.

Remaining contractual maturity of securities sold under agreements to repurchase

	Remaining Contractual Maturity of the Agreements
March 31, 2016	Overnight and Continuous		Up to 30 days		30-90 days		Greater than 90 days		Total
					($ in Thousands)
Repurchase agreements
GSE securities	$	508,262	$	—	$	—	$	—	$	508,262
Total	$	508,262	$	—	$	—	$	—	$	508,262
December 31, 2015
Repurchase agreements
GSE securities	$	383,568	$	—	$	—	$	—	$	383,568
Total	$	383,568	$	—	$	—	$	—	$	383,568

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Derivative and Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Balance sheet category and fair values of derivative instruments not designated as hedging instruments

The table below identifies the balance sheet category and fair values of the Corporation’s free standing derivative instruments, which are not designated as hedging instruments.

	March 31, 2016						December 31, 2015
($ in Thousands)	Notional Amount		Fair Value			Balance Sheet Category	Notional Amount		Fair Value			Balance Sheet Category
Interest rate-related instruments — customer and mirror	$	1,806,688	$	47,780		Trading assets	$	1,665,965	$	29,391		Trading assets
Interest rate-related instruments — customer and mirror	1,806,688		(50,145		)	Trading liabilities	1,665,965		(30,886		)	Trading liabilities
Interest rate lock commitments (mortgage)	418,136		2,689			Other assets	271,530		958			Other assets
Forward commitments (mortgage)	249,866		(1,732		)	Other liabilities	231,798		403			Other assets
Foreign currency exchange forwards	124,617		4,203			Trading assets	72,976		1,532			Trading assets
Foreign currency exchange forwards	116,751		(4,097		)	Trading liabilities	65,649		(1,398		)	Trading liabilities
Commodity contracts	43,646		1,104			Trading assets	44,380		1,269			Trading assets
Commodity contracts	43,770		(981		)	Trading liabilities	44,256		(1,146		)	Trading liabilities
Purchased options (time deposit)	103,475		2,228			Other assets	104,582		2,715			Other assets
Written options (time deposit)	103,475		(2,228		)	Other liabilities	104,582		(2,715		)	Other liabilities

Gain (loss) on derivative instruments not designated as hedging instruments

The table below identifies the income statement category of the gains and losses recognized in income on the Corporation’s derivative instruments not designated as hedging instruments.

	Income Statement Category of Gain / (Loss) Recognized in Income	For the Three Months Ended March 31,
($ in Thousands)		2016			2015
Derivative Instruments:
Interest rate-related instruments — customer and mirror, net	Capital market fees, net	$	(870	)	$	(294	)
Interest rate lock commitments (mortgage)	Mortgage banking, net	1,731			1,738
Forward commitments (mortgage)	Mortgage banking, net	(2,135		)	640
Foreign currency exchange forwards	Capital market fees, net	(28		)	66
Commodity contracts	Capital market fees, net	—			—

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Balance Sheet Offsetting (Tables)

3 Months Ended

Mar. 31, 2016

Offsetting [Abstract]

Balance Sheet Offsetting of Derivative Assets and Liabilities

The following table presents the assets and liabilities subject to an enforceable master netting arrangement. The interest and commodity agreements we have with our commercial customers are not subject to an enforceable master netting arrangement, and therefore, are excluded from this table.

	Gross amounts recognized						Gross amounts not offset in the balance sheet
			Gross amounts offset in the balance sheet		Net amounts presented in the balance sheet		Financial instruments			Collateral			Net amount
	($ in Thousands)
March 31, 2016
Derivative assets:
Interest and commodity agreements	$	823	$	—	$	823	$	(823	)	$	—		$	—
Derivative liabilities:
Interest and commodity agreements	$	48,700	$	—	$	48,700	$	(823	)	$	(47,877	)	$	—
December 31, 2015
Derivative assets:
Interest and commodity instruments	$	1,466	$	—	$	1,466	$	(1,466	)	$	—		$	—
Derivative liabilities:
Interest and commodity instruments	$	30,200	$	—	$	30,200	$	(1,466	)	$	(28,734	)	$	—

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Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings (Tables)

3 Months Ended

Mar. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Summary of lending-related and other commitments

The following is a summary of lending-related commitments.

	March 31, 2016		December 31, 2015
	($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(1)(2)	$	7,315,642	$	7,402,518
Commercial letters of credit(1)	7,782		9,945
Standby letters of credit(3)	278,740		296,508

1) These off-balance sheet financial instruments are exercisable at the market rate prevailing at the date the underlying transaction will be completed and, thus, are deemed to have no current fair value, or the fair value is based on fees currently charged to enter into similar agreements and is not material at March 31, 2016 or December 31, 2015.

2) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 10.

3) The Corporation has established a liability of $3 million at both March 31, 2016 and December 31, 2015, as an estimate of the fair value of these financial instruments.

Summary of changes in the residential mortgage repurchase reserve

The following summarizes the changes in the mortgage repurchase reserve.

	For the Three Months Ended March 31, 2016			For the Year Ended December 31, 2015
	($ in Thousands)
Balance at beginning of period	$	1,197		$	3,258
Repurchase provision expense	70			428
Adjustments to provision expense	—			(2,450		)
Charge offs, net	(3		)	(39		)
Balance at end of period	$	1,264		$	1,197

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured on Recurring Basis at Fair Value

Assets and Liabilities Measured at Fair Value on a Recurring Basis

	Fair Value Hierarchy	March 31, 2016		December 31, 2015
		($ in Thousands)
Assets:
Investment securities available for sale:
U.S. Treasury securities	Level 1	$	1,000	$	997
Residential mortgage-related securities:
FNMA / FHLMC	Level 2	1,303,404		1,414,626
GNMA	Level 2	1,547,255		1,590,003
Private-label	Level 2	1,512		1,709
GNMA commercial mortgage-related securities	Level 2	2,047,865		1,955,310
Other securities (debt and equity)	Level 1	1,605		1,569
Other securities (debt and equity)	Level 2	3,000		3,000
Other securities (debt and equity)	Level 3	200		200
Total investment securities available for sale	Level 1	2,605		2,566
Total investment securities available for sale	Level 2	4,903,036		4,964,648
Total investment securities available for sale	Level 3	200		200
Interest rate-related instruments	Level 2	47,780		29,391
Foreign currency exchange forwards	Level 2	4,203		1,532
Interest rate lock commitments to originate residential mortgage loans held for sale	Level 3	2,689		958
Forward commitments to sell residential mortgage loans	Level 3	—		403
Commodity contracts	Level 2	1,104		1,269
Purchased options (time deposit)	Level 2	2,228		2,715
Liabilities:
Interest rate-related instruments	Level 2	50,145		30,886
Foreign currency exchange forwards	Level 2	4,097		1,398
Forward commitments to sell residential mortgage loans	Level 3	1,732		—
Commodity contracts	Level 2	981		1,146
Written options (time deposit)	Level 2	2,228		2,715

Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)

The table below presents a rollforward of the balance sheet amounts for the three months ended March 31, 2016 and the year ended December 31, 2015, for financial instruments measured on a recurring basis and classified within Level 3 of the fair value hierarchy.

	Investment Securities Available for Sale		Derivative Financial Instruments
	($ in Thousands)
Balance December 31, 2014	$	200	$	(488	)
Total net gains included in income:
Mortgage derivative gain	—		1,849
Balance December 31, 2015	$	200	$	1,361
Total net losses included in income:
Mortgage derivative loss	—		(404		)
Balance March 31, 2016	$	200	$	957

Assets and Liabilities Measured on Nonrecurring Basis at Fair Value

The table below presents the Corporation’s loans held for sale, impaired loans, and mortgage servicing rights measured at fair value on a nonrecurring basis as of March 31, 2016 and December 31, 2015, aggregated by the level in the fair value hierarchy within which those measurements fall.

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

				Income Statement Category of Adjustment Recognized in Income	Adjustment Recognized in Income
($ in Thousands)	Fair Value Hierarchy	Fair Value
March 31, 2016
Assets:
Loans held for sale (2)	Level 2	$	129,398	Mortgage banking, net	$	—
Impaired loans (1)	Level 3	84,664		Provision for credit losses	(15,097		)
Mortgage servicing rights	Level 3	61,410		Mortgage banking, net	(909		)
December 31, 2015
Assets:
Loans held for sale	Level 2	$	124,915	Mortgage banking, net	$	(155	)
Impaired loans (1)	Level 3	41,891		Provision for credit losses	(7,796		)
Mortgage servicing rights	Level 3	70,686		Mortgage banking, net	425

(1) Represents individually evaluated impaired loans, net of the related allowance for loan losses.

(2) Loans held for sale are carried at the lower of cost or estimated fair value. At March 31, 2016, the estimated fair value exceeded the cost and therefore there was no adjustment recognized in Income.

Estimated fair values of financial instruments

The estimated fair values of the Corporation’s financial instruments were as follows.

		March 31, 2016				December 31, 2015
	Fair Value Hierarchy Level	Carrying Amount		Fair Value		Carrying Amount		Fair Value
		($ in Thousands)
Financial assets:
Cash and due from banks	Level 1	$	287,183	$	287,183	$	374,921	$	374,921
Interest-bearing deposits in other financial institutions	Level 1	68,025		68,025		79,764		79,764
Federal funds sold and securities purchased under agreements to resell	Level 1	20,200		20,200		19,000		19,000
Investment securities held to maturity	Level 2	1,176,821		1,204,345		1,168,230		1,184,442
Investment securities available for sale	Level 1	2,605		2,605		2,566		2,566
Investment securities available for sale	Level 2	4,903,036		4,903,036		4,964,648		4,964,648
Investment securities available for sale	Level 3	200		200		200		200
FHLB and Federal Reserve Bank stocks	Level 2	181,853		181,853		147,240		147,240
Loans held for sale	Level 2	128,339		129,398		124,915		124,915
Loans, net	Level 3	18,949,870		19,025,680		18,440,079		18,389,832
Bank owned life insurance	Level 2	580,583		580,583		583,019		583,019
Derivatives (trading and other assets)	Level 2	55,315		55,315		34,907		34,907
Derivatives (trading and other assets)	Level 3	2,689		2,689		1,361		1,361
Financial liabilities:
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts	Level 3	$	19,117,418	$	19,117,418	$	19,444,863	$	19,444,863
Brokered CDs and other time deposits	Level 2	1,568,042		1,576,714		1,562,802		1,564,464
Short-term funding	Level 2	1,417,408		1,417,408		834,416		834,416
Long-term funding	Level 2	2,861,316		2,925,447		2,676,164		2,728,112
Standby letters of credit (1)	Level 2	2,746		2,746		2,954		2,954
Derivatives (trading and other liabilities)	Level 2	57,451		57,451		36,145		36,145
Derivatives (trading and other liabilities)	Level 3	1,732		1,732		—		—

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Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2016

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Net period benefit cost for the pension and postretirement plans

The components of net periodic benefit cost for the RAP and Postretirement Plans for three months ended March 31, 2016 and 2015 were as follows.

	Three Months Ended March 31,
	2016			2015
	($ in Thousands)
Components of Net Periodic Benefit Cost
Pension Plan:
Service cost	$	1,725		$	3,063
Interest cost	1,780			1,642
Expected return on plan assets	(5,065		)	(5,350		)
Amortization of prior service cost	13			13
Amortization of actuarial loss	482			532
Total net pension cost	$	(1,065	)	$	(100	)
Postretirement Plan:
Interest cost	$	36		$	35
Total net periodic benefit cost	$	36		$	35

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Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Selected segment information

Information about the Corporation’s segments is presented below.

Segment Income Statement Data
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business			Risk Management and Shared Services			Consolidated Total
Three Months Ended March 31, 2016
Net interest income	$	79,164		$	85,605		$	7,218		$	171,987
Noninterest income	11,613			63,748			7,831			83,192
Total revenue	90,777			149,353			15,049			255,179
Credit provision*	12,739			6,142			1,119			20,000
Noninterest expense	34,403			121,295			18,273			173,971
Income (loss) before income taxes	43,635			21,916			(4,343		)	61,208
Income tax expense (benefit)	14,579			7,670			(3,575		)	18,674
Net income (loss)	$	29,056		$	14,246		$	(768	)	$	42,534
Return on average allocated capital (ROCET1)**	11.3		%	9.1		%	(5.0		)%	8.6		%
Three Months Ended March 31, 2015
Net interest income	$	75,691		$	86,357		$	5,765		$	167,813
Noninterest income	12,613			65,344			1,856			79,813
Total revenue	88,304			151,701			7,621			247,626
Credit provision*	9,526			7,071			(12,097		)	4,500
Noninterest expense	34,460			118,373			21,159			173,992
Income (loss) before income taxes	44,318			26,257			(1,441		)	69,134
Income tax expense (benefit)	15,368			9,190			(2,096		)	22,462
Net income	$	28,950		$	17,067		$	655		$	46,672
Return on average allocated capital (ROCET1)**	12.5		%	10.7		%	(1.1		)%	10.2		%

Segment Balance Sheet Data
($ in Thousands)	Corporate and Commercial Specialty		Community, Consumer, and Business		Risk Management and Shared Services		Consolidated Total
Three Months Ended March 31, 2016
Average earning assets	$	9,720,028	$	9,120,319	$	6,432,026	$	25,272,373
Average loans	9,711,221		9,119,020		92,589		18,922,830
Average deposits	5,918,341		11,100,195		3,556,638		20,575,174
Average allocated capital (CET1)**	$	1,031,659	$	627,211	$	237,611	$	1,896,481
Three Months Ended March 31, 2015
Average earning assets	$	9,218,844	$	8,525,399	$	6,403,783	$	24,148,026
Average loans	9,210,992		8,525,399		78,724		17,815,115
Average deposits	5,421,541		10,522,618		3,111,037		19,055,196
Average allocated capital (CET1)**	$	942,764	$	647,375	$	214,078	$	1,804,217
* The consolidated credit provision is equal to the actual reported provision for credit losses.
** The Federal Reserve establishes capital adequacy requirements for the Corporation, including Tier 1 capital. Tier 1 capital is comprised of common capital and certain redeemable, non-cumulative preferred stock. Average allocated capital represents average common equity Tier 1 which is defined as average Tier 1 capital excluding qualifying perpetual preferred stock and qualifying trust preferred securities. This is a non-GAAP financial measure. For segment reporting purposes, the ROCET1 reflects return on average allocated common equity Tier 1 (“CET1”). The ROCET1 for the Risk Management and Shared Services segment and the Consolidated Total is inclusive of the annualized effect of the preferred stock dividends.

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Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2016

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Summary of activity in accumulated other comprehensive income (loss)

The following table summarizes the components of accumulated other comprehensive income (loss) at March 31, 2016 and 2015, changes during the three month periods then ended, and reclassifications out of accumulated other comprehensive income (loss) during the three month periods ended March 31, 2016 and 2015, respectively.

($ in Thousands)	Investments Securities Available For Sale			Defined Benefit Pension and Post Retirement Obligations			Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2016	$	459		$	(33,075	)	$	(32,616	)
Other comprehensive income before reclassifications	60,422			—			60,422
Amounts reclassified from accumulated other comprehensive income (loss):
Investment securities gain, net	(3,098		)	—			(3,098		)
Personnel expense	—			495			495
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(1,572		)	—			(1,572		)
Income tax expense	(21,275		)	(189		)	(21,464		)
Net other comprehensive income during period	34,477			306			34,783
Balance March 31, 2016	$	34,936		$	(32,769	)	$	2,167
Balance January 1, 2015	$	18,512		$	(23,362	)	$	(4,850	)
Other comprehensive income before reclassifications	47,418			—			47,418
Amounts reclassified from accumulated other comprehensive income:
Personnel expense	—			545			545
Income tax expense	(18,105		)	(208		)	(18,313		)
Net other comprehensive income during period	29,313			337			29,650
Balance March 31, 2015	$	47,825		$	(23,025	)	$	24,800

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Acquisitions (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Feb. 17, 2015	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Common stock issued in acquisition		$ 0	$ 43,530
Goodwill acquired during period		3,000
Additions to finite-lived intangible assets		1,000		$ 12,000
Ahmann and Martin Company [Member]
Business Acquisition [Line Items]
Common stock issued in acquisition	$ 48,000
Maximum contingent consideration	$ 8,000
Goodwill acquired during period				40,000
Other Intangible Assets [Member]
Business Acquisition [Line Items]
Additions to finite-lived intangible assets		$ 1,012		$ 12,115

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New Accounting Pronouncements Adopted (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Other Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ (3)
Long-term Debt [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ (3)

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Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Calculations for basic and diluted earnings per common share
Net income	$ 42,534	$ 46,672
Preferred stock dividends	(2,198)	(1,228)
Net income available to common equity	40,336	45,444
Common shareholder dividends	(16,203)	(15,166)
Unvested share-based payment awards	(206)	(114)
Undistributed earnings	23,927	30,164
Undistributed earnings allocated to common shareholders	23,686	29,886
Undistributed earnings allocated to unvested share-based payment awards	241	278
Undistributed earnings	23,927	30,164
Basic
Distributed earnings to common shareholders	16,203	15,166
Undistributed earnings allocated to common shareholders	23,686	29,886
Total common shareholders earnings, basic	39,889	45,052
Diluted
Distributed earnings to common shareholders	16,203	15,166
Undistributed earnings allocated to common shareholders	23,686	29,886
Total common shareholders earnings, diluted	$ 39,889	$ 45,052
Weighted average common shares outstanding (in shares)	148,601	150,070
Effect of dilutive common stock awards (in shares)	853	1,094
Diluted weighted average common shares outstanding (in shares)	149,454	151,164
Basic earnings (loss) per common share (in usd per share)	$ 0.27	$ 0.30
Diluted earnings (loss) per common share (in usd per share)	$ 0.27	$ 0.30
Earnings Per Share (Textuals) [Abstract]
Number of antidilutive stock options excluded from the computation of diluted earnings per share (in shares)	3,000	2,000
Warrants to purchase	4,000	4,000

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Stock-Based Compensation, Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Fair value assumptions of stock options
Dividend yield	2.50%	2.00%
Risk-free interest rate	2.00%	2.00%
Weighted average expected volatility	25.00%	20.00%
Weighted average expected life	5 years 6 months	6 years
Weighted average per share fair value of stock options (in usd per share)	$ 3.36	$ 3.08
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Stock Options Shares Outstanding, Beginning balance (in shares)	6,629,143	7,847,338
Granted (in shares)	1,302,298	1,348,504
Exercised (in shares)	(96,602)	(1,351,646)
Forfeited or expired (in shares)	(48,190)	(1,215,053)
Stock Options Shares Outstanding, Ending balance (in shares)	7,786,649	6,629,143
Options exercisable (in shares)	4,907,257	4,190,245
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Stock Options Outstanding, Weighted Average Exercise Price, Beginning balance (in usd per share)	$ 17.22	$ 18.34
Granted, Weighted Average Exercise Price (in usd per share)	17.45	17.95
Exercised, Weighted Average Exercise Price (in usd per share)	13.60	13.90
Forfeited or expired, Weighted Average Exercise Price (in usd per share)	17.75	29.13
Stock Options Outstanding, Weighted Average Exercise Price, Ending balance (in usd per share)	17.30	17.22
Options Exercisable, Weighted Average Exercise Price (in usd per share)	$ 17.22	$ 17.25
Stock Options Outstanding, Weighted Average Remaining Contractual Term	6 years 7 months 10 days	6 years 2 months 26 days
Options exercisable, Weighted Average Remaining Contractual Term	5 years 2 months 5 days	4 years 11 months 5 days
Stock Options Outstanding, Aggregate Intrinsic Value	$ 14,682	$ 18,730
Options exercisable, Aggregate Intrinsic Value	$ 12,950	$ 14,873

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Stock-Based Compensation, Nonvested Stock Option Activity (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Summary of nonvested stock activity
Granted (in shares)	1,302,298	1,348,504
Nonvested Stock Options [Member]
Summary of nonvested stock activity
Stock Options Shares Outstanding, Beginning balance (in shares)	2,438,898	2,770,662
Granted (in shares)	1,302,298	1,348,504
Vested (in shares)	(813,614)	(1,459,709)
Forfeited (in shares)	(48,190)	(220,559)
Stock Options Shares Outstanding, Ending balance (in shares)	2,879,392	2,438,898
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Exercise Price [Roll Forward]
Nonvested Weighted Average Grant Date Fair Value, Beginning balance (in usd per share)	$ 3.15	$ 3.74
Granted Weighted Average Grant Date Fair Value (in usd per share)	3.36	3.08
Vested Weighted Average Grant Date Fair Value (in usd per share)	3.25	4.19
Forfeited Weighted Average Grant Date Fair Value (in usd per share)	3.20	3.28
Nonvested Weighted Average Grant Date Fair Value, Ending balance (in usd per share)	$ 3.21	$ 3.15

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Stock-Based Compensation, Restricted Stock Activity (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding Shares, Beginning balance (in shares)	2,250,028	1,982,126
Granted (in shares)	1,041,985	1,173,847
Vested (in shares)	(732,553)	(709,582)
Forfeited (in shares)	(34,299)	(196,363)
Outstanding Shares, Ending balance (in shares)	2,525,161	2,250,028
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, Weighted Average Grant Date Fair Value, Beginning balance (in usd per share)	$ 17.03	$ 15.79
Granted, Weighted Average Grant Date Fair Value (in usd per share)	16.37	18.09
Vested, Weighted Average Grant Date Fair Value (in usd per share)	16.46	15.62
Forfeited, Weighted Average Grant Date Fair Value (in usd per share)	17.69	16.87
Outstanding Weighted Average Grant Date Fair Value, Ending balance (in usd per share)	$ 16.91	$ 17.03

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Stock-Based Compensation (Details Textuals) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 7 months 10 days	6 years 2 months 26 days
Unvested share-based payment awards	$ 8,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	5 years 2 months 5 days	4 years 11 months 5 days
Stock Based Compensation (Textuals) [Abstract]
Intrinsic value of stock options exercised	$ 420	$ 7,000
Total fair value of vested stock options	$ 3,000	$ 6,000
Service-based Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years	4 years
Performance-based Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years	3 years
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense for accelerated vesting of stock options	$ 857
Recognized compensation expense for vesting of stock options	$ 1,000	$ 4,000
Total compensation cost not yet recognized, period for recognition	fourth quarter 2019
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense for accelerated vesting of stock options	$ 2,000
Recognized compensation expense for vesting of stock options	7,000	$ 15,000
Unvested share-based payment awards	$ 33,000
Total compensation cost not yet recognized, period for recognition	fourth quarter 2019
2013 Incentive Compensation Plan [Member] | Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration term of awards	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
2013 Incentive Compensation Plan [Member] | Service-based Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of transfer restrictions	4 years
2013 Incentive Compensation Plan [Member] | Performance-based Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of transfer restrictions	3 years

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Investment Securities, AFS and HTM Securities Amortized Costs and Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investment securities available for sale:
Amortized Cost	$ 4,865,970	$ 4,984,867
Gross Unrealized Gains	52,349	35,684
Gross Unrealized Losses	(12,478)	(53,137)
Fair Value	4,905,841	4,967,414
Investment securities held to maturity:
Amortized Cost	1,176,821	1,168,230
Gross Unrealized Gains	27,855	17,505
Gross Unrealized Losses	(331)	(1,293)
Fair Value	1,204,345	1,184,442
US Treasury Securities [Member]
Investment securities available for sale:
Amortized Cost	1,000	999
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(2)
Fair Value	1,000	997
Obligations of state and political subdivisions (municipal securities) [Member]
Investment securities held to maturity:
Amortized Cost	1,054,757	1,043,767
Gross Unrealized Gains	25,972	16,803
Gross Unrealized Losses	(146)	(339)
Fair Value	1,080,583	1,060,231
Private Label [Member]
Investment securities available for sale:
Amortized Cost	1,535	1,722
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(23)	(14)
Fair Value	1,512	1,709
Investment securities held to maturity:
Amortized Cost	0
Fair Value	0
GNMA Commercial Mortgage-Related Securities [Member]
Investment securities available for sale:
Amortized Cost	2,053,540	1,982,477
Gross Unrealized Gains	5,855	1,334
Gross Unrealized Losses	(11,530)	(28,501)
Fair Value	2,047,865	1,955,310
Investment securities held to maturity:
Amortized Cost	0
Fair Value	0
Other Debt And Other Equity Securities [Member]
Investment securities available for sale:
Amortized Cost	4,718	4,718
Gross Unrealized Gains	87	51
Gross Unrealized Losses	0	0
Fair Value	4,805	4,769
FNMA and FHLMC [Member] | Residential Related Securities [Member]
Investment securities available for sale:
Amortized Cost	1,268,929	1,388,995
Gross Unrealized Gains	35,321	33,791
Gross Unrealized Losses	(846)	(8,160)
Fair Value	1,303,404	1,414,626
Investment securities held to maturity:
Amortized Cost	40,404	41,469
Gross Unrealized Gains	797	513
Gross Unrealized Losses	(180)	(645)
Fair Value	41,021	41,337
GNMA [Member] | Residential Related Securities [Member]
Investment securities available for sale:
Amortized Cost	1,536,248	1,605,956
Gross Unrealized Gains	11,086	507
Gross Unrealized Losses	(79)	(16,460)
Fair Value	1,547,255	1,590,003
Investment securities held to maturity:
Amortized Cost	81,660	82,994
Gross Unrealized Gains	1,086	189
Gross Unrealized Losses	(5)	(309)
Fair Value	$ 82,741	$ 82,874

XML

Investment Securities, AFS and HTM Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Amortized Cost
Available for Sale, Due in one year or less	$ 2,500
Available for Sale, Due after one year through five years	3,200
Available for Sale, Due after five years through ten years	0
Available for Sale, Due after ten years	0
Available for Sale, Total debt securities	5,700
Investment securities available for sale, amortized cost	4,865,970	$ 4,984,867
Fair Value
Available for Sale, Due in one year or less	2,530
Available for Sale, Due after one year through five years	3,200
Available for Sale, Due after five years through ten years	0
Available for Sale, Due after ten years	0
Available for Sale, Total debt securities	5,730
Investment securities available for sale, at fair value	$ 4,905,841	4,967,414
Ratio of Fair Value to Amortized Cost	100.80%
Amortized Cost
Held to Maturity, Due in one year or less	$ 46,749
Held to Maturity, Due after one year through five years	243,423
Held to Maturity, Due after five years through ten years	245,683
Held to Maturity, Due after ten years	518,902
Held to Maturity, Debt Securities, Amortized Cost Basis	1,054,757
Held to Maturity Amortized Cost	1,176,821	1,168,230
Fair Value
Held to Maturity, Due in one year or less	32,151
Held to Maturity, Due after one year through five years	255,338
Held to Maturity, Due after five years through ten years	255,755
Held to Maturity, Due after ten years	537,339
Held to Maturity, Securities, Debt Securities	1,080,583
Held to Maturity, Total debt securities	$ 1,204,345	1,184,442
Ratio of Fair Value to Amortized Cost	102.30%
Private Label [Member]
Amortized Cost
Investment securities available for sale, amortized cost	$ 1,535	1,722
Fair Value
Investment securities available for sale, at fair value	1,512	1,709
Amortized Cost
Held to Maturity Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities	0
GNMA Commercial Mortgage-Related Securities [Member]
Amortized Cost
Investment securities available for sale, amortized cost	2,053,540	1,982,477
Fair Value
Investment securities available for sale, at fair value	2,047,865	1,955,310
Amortized Cost
Held to Maturity Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities	0
Equity Securities [Member]
Amortized Cost
Investment securities available for sale, amortized cost	18
Fair Value
Investment securities available for sale, at fair value	75
Amortized Cost
Held to Maturity Amortized Cost	0
Fair Value
Held to Maturity, Total debt securities	0
FNMA and FHLMC [Member] | Residential Related Securities [Member]
Amortized Cost
Investment securities available for sale, amortized cost	1,268,929	1,388,995
Fair Value
Investment securities available for sale, at fair value	1,303,404	1,414,626
Amortized Cost
Held to Maturity Amortized Cost	40,404	41,469
Fair Value
Held to Maturity, Total debt securities	41,021	41,337
GNMA [Member] | Residential Related Securities [Member]
Amortized Cost
Investment securities available for sale, amortized cost	1,536,248	1,605,956
Fair Value
Investment securities available for sale, at fair value	1,547,255	1,590,003
Amortized Cost
Held to Maturity Amortized Cost	81,660	82,994
Fair Value
Held to Maturity, Total debt securities	$ 82,741	$ 82,874

XML

Investment Securities, Gains, Losses, and Proceeds (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross gains	$ 3,287	$ 0
Gross losses	(189)	0
Total investment securities gains, net	3,098	0
Proceeds from sales of securities	$ 119,379	$ 289

XML

Investment Securities, AFS and HTM Securities Gross Unrealized Losses (Details) $ in Thousands	Mar. 31, 2016 USD ($) security	Dec. 31, 2015 USD ($) security
Unrealized losses and fair value of available for sale securities , by investment category and time length
Unrealized losses on available for sale securities, less than 12 months	$ (1,470)	$ (27,621)
Unrealized losses on available for sale securities, 12 months or more	(11,008)	(25,516)
Total unrealized losses on available for sale securities	(12,478)	(53,137)
Fair value of unrealized losses on available for sale securities, less than 12 months	600,609	2,789,260
Fair value of unrealized losses on available for sale securities, 12 months or more	708,913	787,969
Total fair value of unrealized losses on available for sale securities	$ 1,309,522	$ 3,577,229
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	23	105
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	36	38
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (78)	$ (524)
Unrealized losses on held to maturity securities, 12 months or more	(253)	(769)
Total unrealized losses on held to maturity securities	(331)	(1,293)
Fair value of unrealized losses on held to maturity securities, less than 12 months	$ 11,209	$ 81,390
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, 12 Months or Longer | security	23	30
Fair value of unrealized losses on held to maturity securities, 12 months or more	$ 20,734	$ 27,157
Total fair value of unrealized losses on held to maturity securities	$ 31,943	$ 108,547
Held-to-maturity, Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions, less than 12 Months | security	21	84
US Treasury Securities [Member]
Unrealized losses and fair value of available for sale securities , by investment category and time length
Unrealized losses on available for sale securities, less than 12 months		$ (2)
Unrealized losses on available for sale securities, 12 months or more		0
Total unrealized losses on available for sale securities		(2)
Fair value of unrealized losses on available for sale securities, less than 12 months		997
Fair value of unrealized losses on available for sale securities, 12 months or more		0
Total fair value of unrealized losses on available for sale securities		$ 997
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security		1
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security		0
Obligations of state and political subdivisions (municipal securities) [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (75)	$ (146)
Unrealized losses on held to maturity securities, 12 months or more	(71)	(193)
Total unrealized losses on held to maturity securities	(146)	(339)
Fair value of unrealized losses on held to maturity securities, less than 12 months	10,029	23,137
Fair value of unrealized losses on held to maturity securities, 12 months or more	5,599	9,254
Total fair value of unrealized losses on held to maturity securities	$ 15,628	$ 32,391
Obligations of state and political subdivisions (municipal securities) [Member] | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Number of held to maturity securities in a continuous unrealized loss position | security	20	53
Obligations of state and political subdivisions (municipal securities) [Member] | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Number of held to maturity securities in a continuous unrealized loss position | security	17	24
Private Label [Member]
Unrealized losses and fair value of available for sale securities , by investment category and time length
Unrealized losses on available for sale securities, less than 12 months	$ (1)	$ (1)
Unrealized losses on available for sale securities, 12 months or more	(22)	(13)
Total unrealized losses on available for sale securities	(23)	(14)
Fair value of unrealized losses on available for sale securities, less than 12 months	76	83
Fair value of unrealized losses on available for sale securities, 12 months or more	1,382	1,565
Total fair value of unrealized losses on available for sale securities	$ 1,458	$ 1,648
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	1	1
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	3	3
GNMA Commercial Mortgage-Related Securities [Member]
Unrealized losses and fair value of available for sale securities , by investment category and time length
Unrealized losses on available for sale securities, less than 12 months	$ (1,390)	$ (9,610)
Unrealized losses on available for sale securities, 12 months or more	(10,140)	(18,891)
Total unrealized losses on available for sale securities	(11,530)	(28,501)
Fair value of unrealized losses on available for sale securities, less than 12 months	558,620	1,132,844
Fair value of unrealized losses on available for sale securities, 12 months or more	448,861	448,218
Total fair value of unrealized losses on available for sale securities	$ 1,007,481	$ 1,581,062
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	20	40
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	21	21
FNMA and FHLMC [Member] | Residential Related Securities [Member]
Unrealized losses and fair value of available for sale securities , by investment category and time length
Unrealized losses on available for sale securities, less than 12 months	$ 0	$ (1,548)
Unrealized losses on available for sale securities, 12 months or more	(846)	(6,612)
Total unrealized losses on available for sale securities	(846)	(8,160)
Fair value of unrealized losses on available for sale securities, less than 12 months	0	220,852
Fair value of unrealized losses on available for sale securities, 12 months or more	258,670	338,186
Total fair value of unrealized losses on available for sale securities	$ 258,670	$ 559,038
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	0	17
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	12	14
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ (3)	$ (177)
Unrealized losses on held to maturity securities, 12 months or more	(177)	(468)
Total unrealized losses on held to maturity securities	(180)	(645)
Fair value of unrealized losses on held to maturity securities, less than 12 months	1,180	12,754
Fair value of unrealized losses on held to maturity securities, 12 months or more	13,587	11,106
Total fair value of unrealized losses on held to maturity securities	$ 14,767	$ 23,860
FNMA and FHLMC [Member] | Residential Related Securities [Member] | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Number of held to maturity securities in a continuous unrealized loss position | security	1	10
FNMA and FHLMC [Member] | Residential Related Securities [Member] | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Number of held to maturity securities in a continuous unrealized loss position | security	5	3
GNMA [Member] | Residential Related Securities [Member]
Unrealized losses and fair value of available for sale securities , by investment category and time length
Unrealized losses on available for sale securities, less than 12 months	$ (79)	$ (16,460)
Unrealized losses on available for sale securities, 12 months or more	0	0
Total unrealized losses on available for sale securities	(79)	(16,460)
Fair value of unrealized losses on available for sale securities, less than 12 months	41,913	1,434,484
Fair value of unrealized losses on available for sale securities, 12 months or more	0	0
Total fair value of unrealized losses on available for sale securities	$ 41,913	$ 1,434,484
Number of available for sale securities in a continuous unrealized loss position less than twelve months | security	2	46
Number of available for sale securities in a continuous unrealized loss position for twelve months or more | security	0	0
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	$ 0	$ (201)
Unrealized losses on held to maturity securities, 12 months or more	(5)	(108)
Total unrealized losses on held to maturity securities	(5)	(309)
Fair value of unrealized losses on held to maturity securities, less than 12 months	0	45,499
Fair value of unrealized losses on held to maturity securities, 12 months or more	1,548	6,797
Total fair value of unrealized losses on held to maturity securities	$ 1,548	$ 52,296
GNMA [Member] | Residential Related Securities [Member] | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Number of held to maturity securities in a continuous unrealized loss position | security	0	21
GNMA [Member] | Residential Related Securities [Member] | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]
Held-to-maturity Securities Continuous Unrealized Loss Position [Abstract]
Number of held to maturity securities in a continuous unrealized loss position | security	1	3

XML

Investment Securities (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities	$ 119,379	$ 289
Marketable Securities, Gain (Loss)	3,098	$ 0
Investment Securities (Textuals) [Abstract]
Securities pledged as collateral	2,700,000		$ 3,200,000
Federal Home Loan Bank Stock	108,000		74,000
Federal Reserve Bank Stock	$ 73,000		$ 73,000

XML

Loans, Loan Composition (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 19,227,240	$ 18,714,343
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	6,511,648	6,190,683
Commercial real estate — owner occupied
Loans and Leases Receivable Disclosure [Line Items]
Total loans	917,285	918,212
Commercial and business lending
Loans and Leases Receivable Disclosure [Line Items]
Total loans	7,428,933	7,108,895
Commercial real estate — investor
Loans and Leases Receivable Disclosure [Line Items]
Total loans	3,276,733	3,234,266
Real estate construction
Loans and Leases Receivable Disclosure [Line Items]
Total loans	1,184,398	1,162,145
Commercial real estate lending
Loans and Leases Receivable Disclosure [Line Items]
Total loans	4,461,131	4,396,411
Total commercial
Loans and Leases Receivable Disclosure [Line Items]
Total loans	11,890,064	11,505,306
Residential mortgage
Loans and Leases Receivable Disclosure [Line Items]
Total loans	5,944,457	5,783,267
Home equity
Loans and Leases Receivable Disclosure [Line Items]
Total loans	982,994	1,005,802
Other consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	409,725	419,968
Total consumer
Loans and Leases Receivable Disclosure [Line Items]
Total loans	$ 7,337,176	$ 7,209,037

XML

Loans Loans, Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 19,227,240	$ 18,714,343
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	18,197,939	17,804,216
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	341,831	430,152
Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	401,075	301,717
Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	286,395	178,258
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,511,648	6,190,683
Commercial and industrial | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,713,979	5,522,809
Commercial and industrial | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	272,090	341,169
Commercial and industrial | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	328,464	233,130
Commercial and industrial | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	197,115	93,575
Commercial real estate — owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	917,285	918,212
Commercial real estate — owner occupied | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	834,879	835,572
Commercial real estate — owner occupied | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	31,856	38,885
Commercial real estate — owner occupied | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	41,107	35,706
Commercial real estate — owner occupied | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	9,443	8,049
Commercial and business lending
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,428,933	7,108,895
Commercial and business lending | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,548,858	6,358,381
Commercial and business lending | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	303,946	380,054
Commercial and business lending | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	369,571	268,836
Commercial and business lending | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	206,558	101,624
Commercial real estate — investor
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,276,733	3,234,266
Commercial real estate — investor | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,208,338	3,153,703
Commercial real estate — investor | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	30,680	45,976
Commercial real estate — investor | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	25,385	25,944
Commercial real estate — investor | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	12,330	8,643
Real estate construction
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,184,398	1,162,145
Real estate construction | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,180,914	1,157,034
Real estate construction | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	222	252
Real estate construction | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,422	3,919
Real estate construction | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	840	940
Commercial real estate lending
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,461,131	4,396,411
Commercial real estate lending | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,389,252	4,310,737
Commercial real estate lending | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	30,902	46,228
Commercial real estate lending | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	27,807	29,863
Commercial real estate lending | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	13,170	9,583
Total commercial
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	11,890,064	11,505,306
Total commercial | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	10,938,110	10,669,118
Total commercial | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	334,848	426,282
Total commercial | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	397,378	298,699
Total commercial | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	219,728	111,207
Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,944,457	5,783,267
Residential mortgage | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,883,743	5,727,437
Residential mortgage | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,014	1,552
Residential mortgage | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,488	2,796
Residential mortgage | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	52,212	51,482
Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	982,994	1,005,802
Home equity | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	967,267	988,574
Home equity | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,446	1,762
Home equity | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	209	222
Home equity | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	14,072	15,244
Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	409,725	419,968
Other consumer | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	408,819	419,087
Other consumer | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	523	556
Other consumer | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Other consumer | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	383	325
Total consumer
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,337,176	7,209,037
Total consumer | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,259,829	7,135,098
Total consumer | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,983	3,870
Total consumer | Potential Problem [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,697	3,018
Total consumer | Nonaccrual Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 66,667	$ 67,051

XML

Loans, Loans by Past Due Status (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Summarized details of Loans
Current	$ 18,923,228	$ 18,510,978
Financing Receivable, Recorded Investment, Nonaccrual Status	286,395	178,258
Total loans	19,227,240	18,714,343
Accruing loans past due 90 days or more	2,000	2,000
Nonaccrual Loans, Current Portion	$ 230,000	$ 124,000
Percent of current nonaccrual loans	80.00%	69.00%
Financing Receivables, 30 to 59 Days Past Due [Member]
Summarized details of Loans
Total Past Due	$ 12,977	$ 20,181
Financing Receivables, 60 to 89 Days Past Due [Member]
Summarized details of Loans
Total Past Due	3,011	3,278
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	1,629	1,648
Commercial and industrial
Summarized details of Loans
Current	6,311,415	6,095,848
Financing Receivable, Recorded Investment, Nonaccrual Status	197,115	93,575
Total loans	6,511,648	6,190,683
Commercial and industrial | Financing Receivables, 30 to 59 Days Past Due [Member]
Summarized details of Loans
Total Past Due	2,665	602
Commercial and industrial | Financing Receivables, 60 to 89 Days Past Due [Member]
Summarized details of Loans
Total Past Due	236	409
Commercial and industrial | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	217	249
Commercial real estate — owner occupied
Summarized details of Loans
Current	907,322	903,021
Financing Receivable, Recorded Investment, Nonaccrual Status	9,443	8,049
Total loans	917,285	918,212
Commercial real estate — owner occupied | Financing Receivables, 30 to 59 Days Past Due [Member]
Summarized details of Loans
Total Past Due	520	7,142
Commercial real estate — owner occupied | Financing Receivables, 60 to 89 Days Past Due [Member]
Summarized details of Loans
Total Past Due	0	0
Commercial real estate — owner occupied | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	0	0
Commercial and business lending
Summarized details of Loans
Current	7,218,737	6,998,869
Financing Receivable, Recorded Investment, Nonaccrual Status	206,558	101,624
Total loans	7,428,933	7,108,895
Commercial and business lending | Financing Receivables, 30 to 59 Days Past Due [Member]
Summarized details of Loans
Total Past Due	3,185	7,744
Commercial and business lending | Financing Receivables, 60 to 89 Days Past Due [Member]
Summarized details of Loans
Total Past Due	236	409
Commercial and business lending | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	217	249
Commercial real estate — investor
Summarized details of Loans
Current	3,263,331	3,225,332
Financing Receivable, Recorded Investment, Nonaccrual Status	12,330	8,643
Total loans	3,276,733	3,234,266
Commercial real estate — investor | Financing Receivables, 30 to 59 Days Past Due [Member]
Summarized details of Loans
Total Past Due	748	291
Commercial real estate — investor | Financing Receivables, 60 to 89 Days Past Due [Member]
Summarized details of Loans
Total Past Due	324	0
Commercial real estate — investor | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	0	0
Real estate construction
Summarized details of Loans
Current	1,183,143	1,160,909
Financing Receivable, Recorded Investment, Nonaccrual Status	840	940
Total loans	1,184,398	1,162,145
Real estate construction | Financing Receivables, 30 to 59 Days Past Due [Member]
Summarized details of Loans
Total Past Due	415	270
Real estate construction | Financing Receivables, 60 to 89 Days Past Due [Member]
Summarized details of Loans
Total Past Due	0	26
Real estate construction | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	0	0
Commercial Real Estate Lending [Member]
Summarized details of Loans
Current	4,446,474	4,386,241
Financing Receivable, Recorded Investment, Nonaccrual Status	13,170	9,583
Total loans	4,461,131	4,396,411
Commercial Real Estate Lending [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Summarized details of Loans
Total Past Due	1,163	561
Commercial Real Estate Lending [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Summarized details of Loans
Total Past Due	324	26
Commercial Real Estate Lending [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	0	0
Commercial Financing Receivable [Member]
Summarized details of Loans
Current	11,665,211	11,385,110
Financing Receivable, Recorded Investment, Nonaccrual Status	219,728	111,207
Total loans	11,890,064	11,505,306
Commercial Financing Receivable [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Summarized details of Loans
Total Past Due	4,348	8,305
Commercial Financing Receivable [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Summarized details of Loans
Total Past Due	560	435
Commercial Financing Receivable [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	217	249
Residential mortgage
Summarized details of Loans
Current	5,888,651	5,726,855
Financing Receivable, Recorded Investment, Nonaccrual Status	52,212	51,482
Total loans	5,944,457	5,783,267
Residential mortgage | Financing Receivables, 30 to 59 Days Past Due [Member]
Summarized details of Loans
Total Past Due	3,199	4,491
Residential mortgage | Financing Receivables, 60 to 89 Days Past Due [Member]
Summarized details of Loans
Total Past Due	395	439
Residential mortgage | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	0	0
Home equity
Summarized details of Loans
Current	963,118	982,639
Financing Receivable, Recorded Investment, Nonaccrual Status	14,072	15,244
Total loans	982,994	1,005,802
Home equity | Financing Receivables, 30 to 59 Days Past Due [Member]
Summarized details of Loans
Total Past Due	4,410	6,190
Home equity | Financing Receivables, 60 to 89 Days Past Due [Member]
Summarized details of Loans
Total Past Due	1,394	1,729
Home equity | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	0	0
Other consumer
Summarized details of Loans
Current	406,248	416,374
Financing Receivable, Recorded Investment, Nonaccrual Status	383	325
Total loans	409,725	419,968
Other consumer | Financing Receivables, 30 to 59 Days Past Due [Member]
Summarized details of Loans
Total Past Due	1,020	1,195
Other consumer | Financing Receivables, 60 to 89 Days Past Due [Member]
Summarized details of Loans
Total Past Due	662	675
Other consumer | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	1,412	1,399
Consumer Loan [Member]
Summarized details of Loans
Current	7,258,017	7,125,868
Financing Receivable, Recorded Investment, Nonaccrual Status	66,667	67,051
Total loans	7,337,176	7,209,037
Consumer Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Summarized details of Loans
Total Past Due	8,629	11,876
Consumer Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Summarized details of Loans
Total Past Due	2,451	2,843
Consumer Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	$ 1,412	$ 1,399

XML

Loans, Impaired Loans Recorded Investment, Unpaid Principal Balance, Related Allowance, Average Recorded Investment, and Interest Income Recognized (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 371,992	$ 265,621
Unpaid Principal Balance	395,678	284,433
Related Allowance	39,109	33,669
Average Recorded Investment	373,687	273,011
Interest Income Recognized	$ 2,117	$ 8,716
Net Recorded Investment of the Impaired Loans	84.00%	82.00%
Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 227,871	$ 186,275
Unpaid Principal Balance	238,082	197,109
Related Allowance	39,109	33,669
Average Recorded Investment	229,224	178,871
Interest Income Recognized	1,981	6,798
Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	144,121	79,346
Unpaid Principal Balance	157,596	87,324
Related Allowance	0	0
Average Recorded Investment	144,463	94,140
Interest Income Recognized	136	1,918
Commercial and industrial
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	226,023	122,868
Unpaid Principal Balance	237,772	131,668
Related Allowance	14,595	8,162
Average Recorded Investment	226,679	126,406
Interest Income Recognized	704	2,512
Commercial and industrial | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	105,780	57,785
Unpaid Principal Balance	106,837	59,409
Related Allowance	14,595	8,162
Average Recorded Investment	106,280	46,833
Interest Income Recognized	613	855
Commercial and industrial | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	120,243	65,083
Unpaid Principal Balance	130,935	72,259
Related Allowance	0	0
Average Recorded Investment	120,399	79,573
Interest Income Recognized	91	1,657
Commercial real estate — owner occupied
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	17,136	15,926
Unpaid Principal Balance	19,601	16,452
Related Allowance	554	448
Average Recorded Investment	17,267	16,621
Interest Income Recognized	89	427
Commercial real estate — owner occupied | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	10,477	9,705
Unpaid Principal Balance	10,596	9,804
Related Allowance	554	448
Average Recorded Investment	10,552	10,087
Interest Income Recognized	89	412
Commercial real estate — owner occupied | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	6,659	6,221
Unpaid Principal Balance	9,005	6,648
Related Allowance	0	0
Average Recorded Investment	6,715	6,534
Interest Income Recognized	0	15
Commercial and business lending
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	243,159	138,794
Unpaid Principal Balance	257,373	148,120
Related Allowance	15,149	8,610
Average Recorded Investment	243,946	143,027
Interest Income Recognized	793	2,939
Commercial and business lending | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	116,257	67,490
Unpaid Principal Balance	117,433	69,213
Related Allowance	15,149	8,610
Average Recorded Investment	116,832	56,920
Interest Income Recognized	702	1,267
Commercial and business lending | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	126,902	71,304
Unpaid Principal Balance	139,940	78,907
Related Allowance	0	0
Average Recorded Investment	127,114	86,107
Interest Income Recognized	91	1,672
Commercial real estate — investor
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	33,323	30,558
Unpaid Principal Balance	34,414	32,284
Related Allowance	1,244	1,831
Average Recorded Investment	33,396	31,041
Interest Income Recognized	461	2,004
Commercial real estate — investor | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	23,494	27,822
Unpaid Principal Balance	24,430	29,444
Related Allowance	1,244	1,831
Average Recorded Investment	23,541	28,278
Interest Income Recognized	461	1,914
Commercial real estate — investor | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	9,829	2,736
Unpaid Principal Balance	9,984	2,840
Related Allowance	0	0
Average Recorded Investment	9,855	2,763
Interest Income Recognized	0	90
Real estate construction
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,226	1,450
Unpaid Principal Balance	1,812	2,154
Related Allowance	412	453
Average Recorded Investment	1,237	1,667
Interest Income Recognized	14	66
Real estate construction | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,226	1,450
Unpaid Principal Balance	1,812	2,154
Related Allowance	412	453
Average Recorded Investment	1,237	1,667
Interest Income Recognized	14	66
Real estate construction | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Commercial Real Estate Lending [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	34,549	32,008
Unpaid Principal Balance	36,226	34,438
Related Allowance	1,656	2,284
Average Recorded Investment	34,633	32,708
Interest Income Recognized	475	2,070
Commercial Real Estate Lending [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	24,720	29,272
Unpaid Principal Balance	26,242	31,598
Related Allowance	1,656	2,284
Average Recorded Investment	24,778	29,945
Interest Income Recognized	475	1,980
Commercial Real Estate Lending [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	9,829	2,736
Unpaid Principal Balance	9,984	2,840
Related Allowance	0	0
Average Recorded Investment	9,855	2,763
Interest Income Recognized	0	90
Commercial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	277,708	170,802
Unpaid Principal Balance	293,599	182,558
Related Allowance	16,805	10,894
Average Recorded Investment	278,579	175,735
Interest Income Recognized	1,268	5,009
Commercial Financing Receivable [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	140,977	96,762
Unpaid Principal Balance	143,675	100,811
Related Allowance	16,805	10,894
Average Recorded Investment	141,610	86,865
Interest Income Recognized	1,177	3,247
Commercial Financing Receivable [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	136,731	74,040
Unpaid Principal Balance	149,924	81,747
Related Allowance	0	0
Average Recorded Investment	136,969	88,870
Interest Income Recognized	91	1,762
Residential mortgage
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	72,019	71,352
Unpaid Principal Balance	77,644	76,117
Related Allowance	12,351	12,462
Average Recorded Investment	72,660	72,909
Interest Income Recognized	583	2,500
Residential mortgage | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	65,281	66,590
Unpaid Principal Balance	70,624	71,084
Related Allowance	12,351	12,462
Average Recorded Investment	65,819	68,183
Interest Income Recognized	548	2,374
Residential mortgage | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	6,738	4,762
Unpaid Principal Balance	7,020	5,033
Related Allowance	0	0
Average Recorded Investment	6,841	4,726
Interest Income Recognized	35	126
Home equity
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	20,989	22,313
Unpaid Principal Balance	23,103	24,533
Related Allowance	9,732	10,118
Average Recorded Investment	21,157	23,168
Interest Income Recognized	258	1,177
Home equity | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	20,337	21,769
Unpaid Principal Balance	22,451	23,989
Related Allowance	9,732	10,118
Average Recorded Investment	20,504	22,624
Interest Income Recognized	248	1,147
Home equity | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	652	544
Unpaid Principal Balance	652	544
Related Allowance	0	0
Average Recorded Investment	653	544
Interest Income Recognized	10	30
Other consumer
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,276	1,154
Unpaid Principal Balance	1,332	1,225
Related Allowance	221	195
Average Recorded Investment	1,291	1,199
Interest Income Recognized	8	30
Other consumer | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,276	1,154
Unpaid Principal Balance	1,332	1,225
Related Allowance	221	195
Average Recorded Investment	1,291	1,199
Interest Income Recognized	8	30
Other consumer | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Consumer Loan [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	94,284	94,819
Unpaid Principal Balance	102,079	101,875
Related Allowance	22,304	22,775
Average Recorded Investment	95,108	97,276
Interest Income Recognized	849	3,707
Consumer Loan [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	86,894	89,513
Unpaid Principal Balance	94,407	96,298
Related Allowance	22,304	22,775
Average Recorded Investment	87,614	92,006
Interest Income Recognized	804	3,551
Consumer Loan [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	7,390	5,306
Unpaid Principal Balance	7,672	5,577
Related Allowance	0	0
Average Recorded Investment	7,494	5,270
Interest Income Recognized	$ 45	$ 156

XML

Loans, Troubled Debt Restructurings Performing and Nonaccrual (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 85,597	$ 87,363
Nonaccrual Restructured Loans	35,232	37,684
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	28,908	29,293
Nonaccrual Restructured Loans	2,711	1,714
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	7,693	7,877
Nonaccrual Restructured Loans	2,689	2,703
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	20,993	21,915
Nonaccrual Restructured Loans	1,356	3,936
Real estate construction
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	386	510
Nonaccrual Restructured Loans	182	177
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	19,807	19,870
Nonaccrual Restructured Loans	23,845	24,592
Home Equity Portfolio Segments [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	6,917	7,069
Nonaccrual Restructured Loans	4,416	4,522
Other consumer
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	893	829
Nonaccrual Restructured Loans	$ 33	$ 40

XML

Loans, Loans Modified in a Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) loan	Mar. 31, 2015 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	59	77
Recorded Investment	$ 4,498	$ 11,409
Unpaid Principal Balance	$ 4,710	$ 11,598
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	7	2
Recorded Investment	$ 1,483	$ 196
Unpaid Principal Balance	$ 1,522	$ 208
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	5
Recorded Investment	$ 125	$ 3,585
Unpaid Principal Balance	$ 130	$ 3,641
Commercial real estate — investor
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	4
Recorded Investment	$ 0	$ 3,030
Unpaid Principal Balance	$ 0	$ 3,042
Real estate construction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	0
Recorded Investment	$ 10	$ 0
Unpaid Principal Balance	$ 55	$ 0
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	30	30
Recorded Investment	$ 2,062	$ 2,816
Unpaid Principal Balance	$ 2,124	$ 2,864
Home Equity Portfolio Segments [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	20	36
Recorded Investment	$ 818	$ 1,782
Unpaid Principal Balance	$ 879	$ 1,843

XML

Loans, Troubled Debt Restructurings Subsequent Default (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) loan	Mar. 31, 2015 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	16	41
Recorded Investment | $	$ 1,314	$ 2,391
Commercial real estate — owner occupied
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1
Recorded Investment | $	$ 0	$ 297
Real estate construction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	0
Recorded Investment | $	$ 10	$ 0
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	7	16
Recorded Investment | $	$ 1,151	$ 1,239
Home Equity Portfolio Segments [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	8	24
Recorded Investment | $	$ 153	$ 855

XML

Loans, Changes in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2016	Dec. 31, 2015
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of year	$ 274,264	$ 266,302
Charge offs	(21,245)	(52,280)
Recoveries	4,351	22,242
Net charge offs	(16,894)	(30,038)
Provision for loan losses	20,000	38,000
Balance at end of year	277,370	274,264
Allowance for loan losses:
Individually evaluated for impairment			$ 14,093	$ 7,963
Collectively evaluated for impairment			263,277	266,301
Total allowance for loan losses	274,264	266,302	277,370	274,264
Loans [Abstract]
Individually evaluated for impairment			220,794	111,487
Collectively evaluated for impairment			19,006,446	18,602,856
Total loans			19,227,240	18,714,343
Commercial and industrial
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of year	129,959	117,635
Charge offs	(16,894)	(27,687)
Recoveries	1,958	9,821
Net charge offs	(14,936)	(17,866)
Provision for loan losses	24,470	30,190
Balance at end of year	139,493	129,959
Allowance for loan losses:
Individually evaluated for impairment			14,005	7,522
Collectively evaluated for impairment			125,488	122,437
Total allowance for loan losses	129,959	117,635	139,493	129,959
Loans [Abstract]
Individually evaluated for impairment			195,341	91,569
Collectively evaluated for impairment			6,316,307	6,099,114
Total loans			6,511,648	6,190,683
Commercial real estate — owner occupied
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of year	18,680	16,510
Charge offs	(76)	(2,645)
Recoveries	33	921
Net charge offs	(43)	(1,724)
Provision for loan losses	(2,059)	3,894
Balance at end of year	16,578	18,680
Allowance for loan losses:
Individually evaluated for impairment			74	0
Collectively evaluated for impairment			16,504	18,680
Total allowance for loan losses	18,680	16,510	16,578	18,680
Loans [Abstract]
Individually evaluated for impairment			7,500	6,221
Collectively evaluated for impairment			909,785	911,991
Total loans			917,285	918,212
Commercial real estate — investor
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of year	43,018	46,333
Charge offs	(176)	(4,645)
Recoveries	1,415	4,157
Net charge offs	1,239	(488)
Provision for loan losses	(2,233)	(2,827)
Balance at end of year	42,024	43,018
Allowance for loan losses:
Individually evaluated for impairment			0	229
Collectively evaluated for impairment			42,024	42,789
Total allowance for loan losses	43,018	46,333	42,024	43,018
Loans [Abstract]
Individually evaluated for impairment			9,829	5,460
Collectively evaluated for impairment			3,266,904	3,228,806
Total loans			3,276,733	3,234,266
Real Estate Construction Portfolio Segment [Member]
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of year	25,266	20,999
Charge offs	(54)	(750)
Recoveries	26	2,268
Net charge offs	(28)	1,518
Provision for loan losses	(3,498)	2,749
Balance at end of year	21,740	25,266
Allowance for loan losses:
Individually evaluated for impairment			0	0
Collectively evaluated for impairment			21,740	25,266
Total allowance for loan losses	25,266	20,999	21,740	25,266
Loans [Abstract]
Individually evaluated for impairment			0	0
Collectively evaluated for impairment			1,184,398	1,162,145
Total loans			1,184,398	1,162,145
Residential Portfolio Segment [Member]
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of year	28,261	31,926
Charge offs	(1,390)	(5,636)
Recoveries	158	1,077
Net charge offs	(1,232)	(4,559)
Provision for loan losses	2,030	894
Balance at end of year	29,059	28,261
Allowance for loan losses:
Individually evaluated for impairment			14	166
Collectively evaluated for impairment			29,045	28,095
Total allowance for loan losses	28,261	31,926	29,059	28,261
Loans [Abstract]
Individually evaluated for impairment			7,472	6,956
Collectively evaluated for impairment			5,936,985	5,776,311
Total loans			5,944,457	5,783,267
Home Equity Portfolio Segments [Member]
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of year	23,555	26,464
Charge offs	(1,746)	(7,048)
Recoveries	600	3,233
Net charge offs	(1,146)	(3,815)
Provision for loan losses	721	906
Balance at end of year	23,130	23,555
Allowance for loan losses:
Individually evaluated for impairment			0	46
Collectively evaluated for impairment			23,130	23,509
Total allowance for loan losses	23,555	26,464	23,130	23,555
Loans [Abstract]
Individually evaluated for impairment			652	1,281
Collectively evaluated for impairment			982,342	1,004,521
Total loans			982,994	1,005,802
Other consumer [Member]
Changes in the allowance for loan losses by portfolio segment
Balance at beginning of year	5,525	6,435
Charge offs	(909)	(3,869)
Recoveries	161	765
Net charge offs	(748)	(3,104)
Provision for loan losses	569	2,194
Balance at end of year	5,346	5,525
Allowance for loan losses:
Individually evaluated for impairment			0	0
Collectively evaluated for impairment			5,346	5,525
Total allowance for loan losses	$ 5,525	$ 6,435	5,346	5,525
Loans [Abstract]
Individually evaluated for impairment			0	0
Collectively evaluated for impairment			409,725	419,968
Total loans			$ 409,725	$ 419,968

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Loans, Changes in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Change in the allowance for unfunded commitments
Balance at beginning of year	$ 24,000
Balance at end of year	24,000	$ 24,000
Reserve for Off-balance Sheet Activities [Member]
Change in the allowance for unfunded commitments
Balance at beginning of year	24,400	24,900
Provision for unfunded commitments	0	(500)
Balance at end of year	$ 24,400	$ 24,400

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Loans (Details Textuals) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Receivables [Abstract]
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 4,498	$ 11,409
Restructured Loans Subsequently Accruing	470
Ytd Restructured Loans Still On Nonaccrual	$ 4,000

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Goodwill and Intangible Assets (Details Textuals) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill acquired during period	$ 3,000
Additions to finite-lived intangible assets	1,000	$ 12,000
Goodwill	971,951	968,844
Fully amortized core deposits intangibles	$ 15,000
Ahmann and Martin Company [Member]
Business Acquisition [Line Items]
Goodwill acquired during period		$ 40,000

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Goodwill and Intangible Assets, Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Summary of core deposit intangibles and other intangibles
Additions during the period	$ 1,000		$ 12,000
Amortization of other intangible assets	504	$ 801
Core Deposit Intangibles [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount	4,385		19,545
Accumulated amortization	(4,062)		(19,152)
Total Estimated Amortization Expense	323		393
Amortization of other intangible assets	70		1,404
Other Intangible Assets [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount	32,410		31,398
Accumulated amortization	(15,767)		(15,333)
Total Estimated Amortization Expense	16,643		16,065
Additions during the period	1,012		12,115
Amortization of other intangible assets	$ 434		$ 1,690

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Goodwill and Intangible Assets, Mortgage Servicing Rights Roll-Forward (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Mortgage servicing rights:
Mortgage servicing rights at beginning of year	$ 62,150	$ 61,379
Additions	1,856	12,372
Amortization	(2,874)	(11,601)
Mortgage servicing rights at end of year	61,132	62,150
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance at beginning of year	(809)	(1,234)
(Additions) recoveries, net	(909)	425
Valuation allowance at end of year	(1,718)	(809)
Mortgage servicing rights, net	59,414	61,341
Fair value of mortgage servicing rights	61,410	70,686
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$ 7,876,888	$ 7,915,224
Mortgage servicing rights, net to servicing portfolio	0.75%	0.77%
Mortgage servicing rights expense	$ 3,783	$ 11,176

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Goodwill and Intangible Assets, Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Core Deposit Intangibles [Member]
Estimated future amortization expense
Nine months ending December 31, 2016	$ 211
Year ending December 31, 2017	112
Year ending December 31, 2018	0
Year ending December 31, 2019	0
Year ending December 31, 2020	0
Year ending December 31, 2021	0
Beyond 2021	0
Total Estimated Amortization Expense	323	$ 393
Other Intangible Assets [Member]
Estimated future amortization expense
Nine months ending December 31, 2016	1,378
Year ending December 31, 2017	1,786
Year ending December 31, 2018	1,756
Year ending December 31, 2019	1,457
Year ending December 31, 2020	1,340
Year ending December 31, 2021	1,316
Beyond 2021	7,610
Total Estimated Amortization Expense	16,643	$ 16,065
Mortgage Service Rights [Member]
Estimated future amortization expense
Nine months ending December 31, 2016	8,850
Year ending December 31, 2017	9,674
Year ending December 31, 2018	7,761
Year ending December 31, 2019	6,313
Year ending December 31, 2020	5,169
Year ending December 31, 2021	4,265
Beyond 2021	19,100
Total Estimated Amortization Expense	$ 61,132

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Short and Long-Term Funding (Components of Short-term and Long-term Funding) (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Short-term Funding [Abstract]
Federal funds purchased		$ 74,985	$ 47,870
Securities sold under agreements to repurchase		508,262	383,568
Federal funds purchased and securities sold under agreements to repurchase		583,247	431,438
FHLB advances		770,000	335,000
Commercial paper		64,161	67,978
Other short-term funding		834,161	402,978
Total short-term funding		1,417,408	834,416
Long-term Funding
FHLB advances		2,365,216	1,750,225
Senior notes, at par		250,000	680,000
Subordinated notes, at par		250,000	250,000
Other long-term funding and capitalized costs (1)		(3,900)	(4,061)
Total long-term funding	[1]	2,861,316	2,676,164
Total short and long-term funding		$ 4,278,724	$ 3,510,580

[1] During the first quarter of 2016, the Corporation adopted a new accounting standard related to simplifying the presentation of debt issuance costs. Under this new accounting standard, debt issuance costs are still capitalized; however, they are reflected on the balance sheet with the related debt issued rather than within other assets. All prior periods have been restated to reflect this change in presentation. See Note 3 for additional information on this new accounting standard.

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Short and Long-Term Funding (Long-term Funding Narrative) (Details) - USD ($) $ in Millions	1 Months Ended
	Nov. 30, 2014	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2011	Mar. 31, 2011
Subordinated Borrowing [Line Items]
Carrying Value of Federal Funds Purchased, Securities Sold under Agreements to Repurchase, and Deposits Received for Securities Loaned		$ 643
Federal Home Loan Bank, Advances, Weighted Average Interest Rate		0.29%	0.24%
Two Thousand Eleven Senior Notes [Member]
Subordinated Borrowing [Line Items]
New Senior Debt Issued				$ 130	$ 300
Debt Instrument, Interest Rate, Stated Percentage					5.125%
Two Thousand Fourteen Senior Notes [Member]
Subordinated Borrowing [Line Items]
New Senior Debt Issued	$ 250
Debt Instrument, Interest Rate, Stated Percentage	2.75%
Two Thousand Fourteen Subordinated Notes [Member]
Subordinated Borrowing [Line Items]
Junior Subordinated Debentures Issued	$ 250
Debt Instrument, Term	10 years
Subordinated Borrowing, Interest Rate	4.25%

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Short and Long-Term Funding (Remaining Contractual Maturity of the Securities Sold Under Agreements to Repurchase) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	$ 508,262	$ 383,568
Securities sold under agreements to repurchase	508,262	383,568
Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	508,262	383,568
Up to 30 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
30-90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Greater than 90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Government-Sponsored Enterprise (GSE) [Member]
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	508,262	383,568
Government-Sponsored Enterprise (GSE) [Member] | Overnight and Continuous
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	508,262	383,568
Government-Sponsored Enterprise (GSE) [Member] | Up to 30 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Government-Sponsored Enterprise (GSE) [Member] | 30-90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	0	0
Government-Sponsored Enterprise (GSE) [Member] | Greater than 90 days
RemainingContractualMaturityoftheSecuritiesSoldUnderAgreementtoRepurchase [Line Items]
Repurchase agreements	$ 0	$ 0

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Derivative and Hedging Activities, Derivative Instruments Not Designated as Hedging Instruments (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Trading Assets [Member] | Interest Rate-related instruments - customer and mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	$ 1,806,688	$ 1,665,965
Fair Value	47,780	29,391
Trading Assets [Member] | Foreign currency exchange forwards [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	124,617	72,976
Fair Value	4,203	1,532
Trading Assets [Member] | Commodity contract [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	43,646	44,380
Fair Value	1,104	1,269
Trading Liabilities [Member] | Interest Rate-related instruments - customer and mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	1,806,688	1,665,965
Fair Value	(50,145)	(30,886)
Trading Liabilities [Member] | Foreign currency exchange forwards [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	116,751	65,649
Fair Value	(4,097)	(1,398)
Trading Liabilities [Member] | Commodity contract [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	43,770	44,256
Fair Value	(981)	(1,146)
Other Assets [Member] | Interest rate lock commitments (mortgage) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	418,136	271,530
Fair Value	2,689	958
Other Assets [Member] | Forward commitments (mortgage) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount		231,798
Fair Value		403
Other Assets [Member] | Purchased options (time deposit) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	103,475	104,582
Fair Value	2,228	2,715
Other Liabilities [Member] | Forward commitments (mortgage) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	249,866
Fair Value	(1,732)
Other Liabilities [Member] | Written options (time deposit) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	103,475	104,582
Fair Value	$ (2,228)	$ (2,715)

XML

Derivative and Hedging Activities, Income Statement Category of the Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Capital market fees, net [Member] | Interest Rate-related instruments - customer and mirror [Member]
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	$ (870)	$ (294)
Capital market fees, net [Member] | Foreign currency exchange forwards [Member]
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	(28)	66
Capital market fees, net [Member] | Commodity contract [Member]
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	0	0
Mortgage banking, net [Member] | Interest rate lock commitments (mortgage) [Member]
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	1,731	1,738
Mortgage banking, net [Member] | Forward commitments (mortgage) [Member]
Gain (loss) on derivative instruments not designated as hedging instruments
Gain / (Loss) Recognized in Income	$ (2,135)	$ 640

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Derivative and Hedging Activities (Details Textuals) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Investment securities and cash equivalents pledged as collateral	$ 28	$ 9
Derivative collateral right to reclaim cash	$ 31	$ 22

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Balance Sheet Offsetting (Details) - Interest Rate Contract [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 823	$ 1,466
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	823	1,466
Financial instruments	(823)	(1,466)
Collateral	0	0
Net amount	0	0
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	48,700	30,200
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	48,700	30,200
Financial instruments	(823)	(1,466)
Collateral	(47,877)	(28,734)
Net amount	$ 0	$ 0

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Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings (Summary of Lending Related and Other Commitments) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale [Member]
Summary of lending-related and other commitments
Lending related commitments	$ 7,315,642	$ 7,402,518
Commercial Letters Of Credit [Member]
Summary of lending-related and other commitments
Lending related commitments	7,782	9,945
Standby Letters of Credit [Member]
Summary of lending-related and other commitments
Lending related commitments	278,740	296,508
Standby letters of credit, fair value	$ 3,000	$ 3,000

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Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings (Details Textuals)	Jan. 11, 2016 USD ($) loan_production_office branch	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Unfunded commitments		$ 24,000,000	$ 24,000,000
Carrying value of investments		53,000,000	52,000,000
Commitments under unconsolidated projects		62,000,000	61,000,000
Commitment term	3 years
Mortgage loan commitment	$ 196,000,000
Number of branch opening commitments | branch	1
Number of loan production offices | loan_production_office	4
Conciliation agreement cost, commitment term	4 years
Loans repurchased under make whole requests		126,000	3,000,000
Loans sold to outside investors original amount		7,900,000,000
Loans sold to outside investors remaining outstanding amount		5,700,000,000
Residential mortgage loans sold with recourse risk		60,000,000	68,000,000
Residential mortgage loans sold with credit recourse risk		122,000,000	132,000,000
The Official Committee of Unsecured Creditors of World Marketing Chicago LLC v Associated Bank [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Damages sought	$ 6,000,000
Damages sought, cash	4,000,000
Damages sought, indebtedness	1,000,000
American Funds Service Company v Associated Bank [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Damages sought	$ 600,000
Reserve for Off-balance Sheet Activities [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Unfunded commitments		24,400,000	24,400,000	$ 24,900,000
Mortgage Repurchase Reserve [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Unfunded commitments		1,264,000	1,197,000	$ 3,258,000
Standby Letters of Credit [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Lines of Credit, Fair Value Disclosure		$ 3,000,000	$ 3,000,000

XML

Commitments, Off-Balance Sheet Arrangements, and Legal Proceedings (Residential Mortgage Repurchase Reserve) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Summary of changes in the residential mortgage repurchase reserve [Line Items]
Loans Repurchased Under Make Whole Requests	$ 126,000	$ 3,000,000
Residential mortgage repurchase reserve
Balance at beginning of year	24,000,000
Balance at end of year	24,000,000	24,000,000
Loss Reimbursement Claims Under Make Whole Requests	3,000	133,000
Loans Sold To Outside Investors Original Amount	7,900,000,000
Loans Sold To Outside Investors Remaining Outstanding Amount	5,700,000,000
Mortgage Repurchase Reserve [Member]
Residential mortgage repurchase reserve
Balance at beginning of year	1,197,000	3,258,000
Repurchase provision expense	70,000	428,000
Adjustments to provision expense	0	(2,450,000)
Charge offs, net	(3,000)	(39,000)
Balance at end of year	$ 1,264,000	$ 1,197,000

XML

Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investment securities available for sale:
Investment securities available for sale	$ 4,905,841	$ 4,967,414
Trading assets	53,087	32,192
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	55,223	33,430
Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale:
Investment securities available for sale	2,605	2,566
Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale:
Investment securities available for sale	4,903,036	4,964,648
Trading assets	55,315	34,907
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	57,451	36,145
Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale:
Investment securities available for sale	200	200
Trading assets	2,689	1,361
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	1,732	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Investment securities available for sale:
Investment securities available for sale	1,000	997
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Debt And Other Equity Securities [Member]
Investment securities available for sale:
Investment securities available for sale	1,605	1,569
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Available-for-sale Securities [Member]
Investment securities available for sale:
Investment securities available for sale	2,605	2,566
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Government-Sponsored Enterprise (GSE) [Member]
Investment securities available for sale:
Investment securities available for sale	1,303,404	1,414,626
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | GNMA [Member]
Investment securities available for sale:
Investment securities available for sale	1,547,255	1,590,003
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Private Label [Member]
Investment securities available for sale:
Investment securities available for sale	1,512	1,709
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | GNMA Commercial Mortgage-Related Securities [Member]
Investment securities available for sale:
Investment securities available for sale	2,047,865	1,955,310
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Debt And Other Equity Securities [Member]
Investment securities available for sale:
Investment securities available for sale	3,000	3,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member]
Investment securities available for sale:
Investment securities available for sale	4,903,036	4,964,648
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate-related instruments - customer and mirror [Member]
Investment securities available for sale:
Trading assets	47,780	29,391
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	50,145	30,886
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign currency exchange forwards [Member]
Investment securities available for sale:
Trading assets	4,203	1,532
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	4,097	1,398
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commodity contract [Member]
Investment securities available for sale:
Trading assets	1,104	1,269
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	981	1,146
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Written options (time deposit) [Member]
Investment securities available for sale:
Trading assets	2,228	2,715
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	2,228	2,715
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Debt And Other Equity Securities [Member]
Investment securities available for sale:
Trading assets	200	200
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member]
Investment securities available for sale:
Investment securities available for sale	200	200
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest rate lock commitments (mortgage) [Member]
Investment securities available for sale:
Trading assets	2,689	958
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Forward commitments (mortgage) [Member]
Investment securities available for sale:
Trading assets	0	403
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	$ 1,732	$ 0

XML

Fair Value Measurements, Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Available-for-sale Securities [Member]
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)
Beginning Balance	$ 200	$ 200
Total net gains included in other comprehensive income
Ending Balance	200	200
Fair Value, Net Derivative Asset (Liability Measure on Recurring Basis, Unobservable Input Reconciliation On Net Losses Included in Income [Abstract]
Mortgage derivative loss	0	0
Derivatives [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	1,361	(488)
Fair Value, Net Derivative Asset (Liability Measure on Recurring Basis, Unobservable Input Reconciliation On Net Losses Included in Income [Abstract]
Mortgage derivative loss	(404)	1,849
Ending Balance	$ 957	$ 1,361

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Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Mortgage servicing rights	$ 59,414		$ 61,341
Mortgage Servicing Rights (MSR) Impairment (Recovery)	(909)	$ (243)
Fair Value, Inputs, Level 2 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	129,398		124,915
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	129,398		124,915
market valuation adjustment, loans held for sale	0		(155)
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Impaired loans	84,664		41,891
Provision for Credit Losses, Impaired Loans	(15,097)		(7,796)
Mortgage servicing rights	61,410		70,686
Mortgage Servicing Rights (MSR) Impairment (Recovery)	$ 909		$ (425)

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Fair Value Measurements, Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Financial assets
Cash and due from banks		$ 287,183	$ 374,921
Interest-bearing deposits in other financial institutions		68,025	79,764
Federal funds sold and securities purchased under agreements to resell		20,200	19,000
Investment securities held to maturity		1,176,821	1,168,230
Investment securities held to maturity, fair value		1,204,345	1,184,442
Investment securities available for sale		4,905,841	4,967,414
FHLB and Federal Reserve Bank stocks		181,853	147,240
Loans held for sale		128,339	124,915
Loans, net		18,949,870	18,440,079
Derivatives (trading and other assets)		53,087	32,192
Financial liabilities
Short-term funding		1,417,408	834,416
Long-term funding	[1]	2,861,316	2,676,164
Derivatives (trading and other liabilities)		55,223	33,430
Fair Value, Inputs, Level 1 [Member]
Financial assets
Cash and due from banks		287,183	374,921
Cash and due from banks, Fair Value		287,183	374,921
Interest-bearing deposits in other financial institutions		68,025	79,764
Interest-bearing deposits in other financial institutions, fair value		68,025	79,764
Federal funds sold and securities purchased under agreements to resell		20,200	19,000
Federal funds sold and securities purchased under agreements to resell, fair value		20,200	19,000
Investment securities available for sale		2,605	2,566
Investment securities available for sale, at fair value		2,605	2,566
Fair Value, Inputs, Level 2 [Member]
Financial assets
Investment securities held to maturity		1,176,821	1,168,230
Investment securities held to maturity, fair value		1,204,345	1,184,442
Investment securities available for sale		4,903,036	4,964,648
Investment securities available for sale, at fair value		4,903,036	4,964,648
FHLB and Federal Reserve Bank stocks		181,853	147,240
Federal Home Loan Bank and Federal Reserve Bank stocks, fair value		181,853	147,240
Loans held for sale		128,339	124,915
Loans held for sale, fair value		129,398	124,915
Bank owned life insurance		580,583	583,019
Bank owned life insurance, fair value		580,583	583,019
Derivatives (trading and other assets)		55,315	34,907
Derivatives (trading and other assets), fair value		55,315	34,907
Financial liabilities
Brokered CDs and other time deposits		1,568,042	1,562,802
Brokered CDs and other time deposits, fair value		1,576,714	1,564,464
Short-term funding		1,417,408	834,416
Short-term funding, fair value		1,417,408	834,416
Long-term funding		2,861,316	2,676,164
Long-term funding, fair value		2,925,447	2,728,112
Standby letters of credit		2,746	2,954
Standby letters of credit, fair value		2,746	2,954
Derivatives (trading and other liabilities)		57,451	36,145
Derivatives (trading and other liabilities), fair value		57,451	36,145
Fair Value, Inputs, Level 3 [Member]
Financial assets
Investment securities available for sale		200	200
Investment securities available for sale, at fair value		200	200
Loans, net		18,949,870	18,440,079
Loans, net, fair value		19,025,680	18,389,832
Derivatives (trading and other assets)		2,689	1,361
Derivatives (trading and other assets), fair value		2,689	1,361
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market accounts		19,117,418	19,444,863
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, fair value		19,117,418	19,444,863
Derivatives (trading and other liabilities)		1,732	0
Derivatives (trading and other liabilities), fair value		$ 1,732	$ 0

[1] During the first quarter of 2016, the Corporation adopted a new accounting standard related to simplifying the presentation of debt issuance costs. Under this new accounting standard, debt issuance costs are still capitalized; however, they are reflected on the balance sheet with the related debt issued rather than within other assets. All prior periods have been restated to reflect this change in presentation. See Note 3 for additional information on this new accounting standard.

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Fair Value Measurements (Details Textuals) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Fair Value Measurements (Textuals) [Abstract]
Other real estate owned measured at fair value	$ 3	$ 11
Write down of Other Real Estate Owned	1	3
Commitment on standby letters of credit	$ 279	$ 297
Fair Value of Assets and Liabilities [Line Items]
Closing ratio	89.00%
Weighted average discount rate	9.60%
Weighted average constant prepayment rate	15.20%
Maximum [Member]
Fair Value of Assets and Liabilities [Line Items]
Weighted average discount rate	15.00%
Minimum [Member]
Fair Value of Assets and Liabilities [Line Items]
Weighted average discount rate	10.00%

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Retirement Plans, Components of Net Periodic Benefit Cost for the Pension and Postretirement Tables (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Retirement Plans Textuals [Abstract]
Defined Benefit Plan, Age of Eligibility of Plan	55 years
Defined Benefit Plan, Service Period for Eligibility in Plan	5 years
Pension Plan [Member]
Net period benefit cost for the pension and postretirement plans
Service cost	$ 1,725	$ 3,063
Interest cost	1,780	1,642
Expected return on plan assets	(5,065)	(5,350)
Prior service cost	13	13
Actuarial (gain) loss	482	532
Total net pension cost	(1,065)	(100)
Other Postretirement Benefit Plan [Member]
Net period benefit cost for the pension and postretirement plans
Interest cost	36	35
Total net pension cost	$ 36	$ 35

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Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Income Statement Data Abstract
Net interest income	$ 171,987	$ 167,813
Noninterest income	83,192	79,813
Total income	255,179	247,626
Provision for credit losses	20,000	4,500
Noninterest expense	173,971	173,992
Income before income taxes	61,208	69,134
Income tax expense	18,674	22,462
Net income	$ 42,534	$ 46,672
Return on average allocated capital (ROCET1)	8.60%	10.20%
Segment Balance Sheet Data
Average earning assets	$ 25,272,373	$ 24,148,026
Average loans	18,922,830	17,815,115
Average deposits	20,575,174	19,055,196
Average allocated capital (CET1)	1,896,481	1,804,217
Operating Segments [Member] | Corporate and Commercial Specialty
Segment Income Statement Data Abstract
Net interest income	79,164	75,691
Noninterest income	11,613	12,613
Total income	90,777	88,304
Provision for credit losses	12,739	9,526
Noninterest expense	34,403	34,460
Income before income taxes	43,635	44,318
Income tax expense	14,579	15,368
Net income	$ 29,056	$ 28,950
Return on average allocated capital (ROCET1)	11.30%	12.50%
Segment Balance Sheet Data
Average earning assets	$ 9,720,028	$ 9,218,844
Average loans	9,711,221	9,210,992
Average deposits	5,918,341	5,421,541
Average allocated capital (CET1)	1,031,659	942,764
Operating Segments [Member] | Community, Consumer, and Business
Segment Income Statement Data Abstract
Net interest income	85,605	86,357
Noninterest income	63,748	65,344
Total income	149,353	151,701
Provision for credit losses	6,142	7,071
Noninterest expense	121,295	118,373
Income before income taxes	21,916	26,257
Income tax expense	7,670	9,190
Net income	$ 14,246	$ 17,067
Return on average allocated capital (ROCET1)	9.10%	10.70%
Segment Balance Sheet Data
Average earning assets	$ 9,120,319	$ 8,525,399
Average loans	9,119,020	8,525,399
Average deposits	11,100,195	10,522,618
Average allocated capital (CET1)	627,211	647,375
Operating Segments [Member] | Risk Management and Shared Services
Segment Income Statement Data Abstract
Net interest income	7,218	5,765
Noninterest income	7,831	1,856
Total income	15,049	7,621
Provision for credit losses	1,119	(12,097)
Noninterest expense	18,273	21,159
Income before income taxes	(4,343)	(1,441)
Income tax expense	(3,575)	(2,096)
Net income	$ (768)	$ 655
Return on average allocated capital (ROCET1)	(5.00%)	(1.10%)
Segment Balance Sheet Data
Average earning assets	$ 6,432,026	$ 6,403,783
Average loans	92,589	78,724
Average deposits	3,556,638	3,111,037
Average allocated capital (CET1)	$ 237,611	$ 214,078

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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (32,616)
Personnel expense	(101,398)	$ (100,152)
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(1,572)	0
Total other comprehensive income (loss)	34,783	29,650
Ending Balance	2,167
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(32,616)	(4,850)
Other comprehensive income (loss) before reclassifications	60,422	47,418
Investment securities gain, net	(3,098)
Personnel expense	495	545
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(1,572)
Income tax (expense) benefit	(21,464)	(18,313)
Total other comprehensive income (loss)	34,783	29,650
Ending Balance	2,167	24,800
Investment Securities Available For Sale [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	459	18,512
Other comprehensive income (loss) before reclassifications	60,422	47,418
Investment securities gain, net	(3,098)
Personnel expense	0	0
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	(1,572)
Income tax (expense) benefit	(21,275)	(18,105)
Total other comprehensive income (loss)	34,477	29,313
Ending Balance	34,936	47,825
Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(33,075)	(23,362)
Other comprehensive income (loss) before reclassifications	0	0
Investment securities gain, net	0
Personnel expense	495	545
Interest income (Amortization of net unrealized gains on available for sale securities transferred to held to maturity securities)	0
Income tax (expense) benefit	(189)	(208)
Total other comprehensive income (loss)	306	337
Ending Balance	$ (32,769)	$ (23,025)