10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended March 31, 2015

OR

¨ 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  ý    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  ý    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	ý	Accelerated filer	¨
Non-accelerated filer	¨ (Do not check if smaller reporting company)	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  ý

APPLICABLE ONLY TO CORPORATE ISSUERS:

The number of shares outstanding of registrant’s common stock, par value $0.01 per share, at April 30, 2015, was 152,521,932.

ASSOCIATED BANC-CORP

TABLE OF CONTENTS

	Page No.
PART I. Financial Information
Item 1. Financial Statements (Unaudited):
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	45
Item 3. Quantitative and Qualitative Disclosures About Market Risk	73
Item 4. Controls and Procedures	73
PART II. Other Information
Item 1. Legal Proceedings	73
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	74
Item 6. Exhibits	75
Signatures	76

2

PART I — FINANCIAL INFORMATION

ITEM 1. Financial Statements:

ASSOCIATED BANC-CORP

Consolidated Balance Sheets

	March 31, 2015 (Unaudited)			December 31, 2014 (Audited)
	(In Thousands, except share and per share data)
ASSETS
Cash and due from banks	$	355,541		$	444,113
Interest-bearing deposits in other financial institutions	488,426			571,924
Federal funds sold and securities purchased under agreements to resell	3,380			16,030
Investment securities held to maturity, at amortized cost	438,047			404,455
Investment securities available for sale, at fair value	5,358,310			5,396,812
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	189,222			189,107
Loans held for sale	159,963			154,935
Loans	17,979,032			17,593,846
Allowance for loan losses	(265,268		)	(266,302		)
Loans, net	17,713,764			17,327,544
Premises and equipment, net	274,591			274,688
Goodwill	968,774			929,168
Other intangible assets, net	77,984			67,582
Trading assets	42,336			35,163
Other assets	998,402			1,010,253
Total assets	$	27,068,740		$	26,821,774
LIABILITIES AND STOCKHOLDERS’ EQUITY
Noninterest-bearing demand deposits	$	4,570,872		$	4,505,272
Interest-bearing deposits	15,280,720			14,258,232
Total deposits	19,851,592			18,763,504
Federal funds purchased and securities sold under agreements to repurchase	587,272			493,991
Other short-term funding	75,265			574,297
Long-term funding	3,429,925			3,930,117
Trading liabilities	44,730			37,329
Accrued expenses and other liabilities	197,818			222,285
Total liabilities	24,186,602			24,021,523
Stockholders’ equity
Preferred equity	59,727			59,727
Common stock	1,674			1,665
Surplus	1,505,170			1,484,933
Retained earnings	1,509,967			1,497,818
Accumulated other comprehensive income (loss)	24,800			(4,850		)
Treasury stock, at cost	(219,200		)	(239,042		)
Total stockholders’ equity	2,882,138			2,800,251
Total liabilities and stockholders’ equity	$	27,068,740		$	26,821,774
Preferred shares issued	61,356			61,356
Preferred shares authorized (par value $1.00 per share)	750,000			750,000
Common shares issued	167,429,351			166,544,252
Common shares authorized (par value $0.01 per share)	250,000,000			250,000,000
Treasury shares of common stock	13,862,507			15,002,318

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,
	2015		2014
	(In Thousands, except per share data)
INTEREST INCOME
Interest and fees on loans	$	151,945	$	143,387
Interest and dividends on investment securities
Taxable	25,092		26,257
Tax exempt	7,887		6,971
Other interest	1,692		1,449
Total interest income	186,616		178,064
INTEREST EXPENSE
Interest on deposits	7,619		6,159
Interest on Federal funds purchased and securities sold under agreements to repurchase	231		305
Interest on other short-term funding	81		116
Interest on long-term funding	10,872		6,511
Total interest expense	18,803		13,091
NET INTEREST INCOME	167,813		164,973
Provision for credit losses	4,500		5,000
Net interest income after provision for credit losses	163,313		159,973
NONINTEREST INCOME
Trust service fees	12,087		11,711
Service charges on deposit accounts	15,806		16,400
Card-based and other nondeposit fees	12,416		12,509
Insurance commissions	19,728		12,317
Brokerage and annuity commissions	3,683		4,033
Mortgage banking, net	7,408		6,361
Capital market fees, net	2,467		2,322
Bank owned life insurance income	2,875		4,320
Asset gains, net	1,096		728
Investment securities gains, net	—		378
Other	2,510		2,442
Total noninterest income	80,076		73,521
NONINTEREST EXPENSE
Personnel expense	100,152		97,698
Occupancy	17,683		15,560
Equipment	5,772		6,276
Technology	15,558		12,724
Business development and advertising	5,327		5,062
Other intangible amortization	801		991
Loan expense	2,996		2,787
Legal and professional fees	4,538		4,188
Foreclosure / OREO expense	1,425		1,896
FDIC expense	6,500		5,001
Other	13,503		15,475
Total noninterest expense	174,255		167,658
Income before income taxes	69,134		65,836
Income tax expense	22,462		20,637
Net income	46,672		45,199
Preferred stock dividends	1,228		1,244
Net income available to common equity	$	45,444	$	43,955
Earnings per common share:
Basic	$	0.30	$	0.27
Diluted	$	0.30	$	0.27
Average common shares outstanding:
Basic	150,070		161,467
Diluted	151,164		162,188

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,
	2015			2014
	($ in Thousands)
Net income	$	46,672		$	45,199
Other comprehensive income, net of tax:
Investment securities available for sale:
Net unrealized gains	47,418			20,627
Reclassification adjustment for net gains realized in net income	—			(378		)
Income tax expense	(18,105		)	(7,786		)
Other comprehensive income on investment securities available for sale	29,313			12,463
Defined benefit pension and postretirement obligations:
Amortization of prior service cost	13			15
Amortization of actuarial losses	532			316
Income tax expense	(208		)	(127		)
Other comprehensive income on pension and postretirement obligations	337			204
Total other comprehensive income	29,650			12,667
Comprehensive income	$	76,322		$	57,866

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, 2013	$	61,862		$	1,750		$	1,617,990		$	1,392,508		$	(24,244	)	$	(158,576	)	$	2,891,290
Comprehensive income:
Net income	—			—			—			45,199			—			—			45,199
Other comprehensive income	—			—			—			—			12,667			—			12,667
Comprehensive income																			57,866
Common stock issued:
Stock-based compensation plans, net	—			—			376			(19,173		)	—			24,596			5,799
Purchase of treasury stock	—			—			—			—			—			(42,199		)	(42,199		)
Cash dividends:
Common stock, $0.09 per share	—			—						(14,639		)	—			—			(14,639		)
Preferred stock	—			—			—			(1,244		)	—			—			(1,244		)
Purchase of preferred stock	(704		)	—			—			(102		)	—			—			(806		)
Stock-based compensation expense, net	—			—			4,412			—			—			—			4,412
Tax benefit of stock-based compensation	—			—			545			—			—			—			545
Balance, March 31, 2014	$	61,158		$	1,750		$	1,623,323		$	1,402,549		$	(11,577	)	$	(176,179	)	$	2,901,024
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 benefit 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

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,
	2015			2014
	($ in Thousands)
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$	46,672		$	45,199
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	4,500			5,000
Depreciation and amortization	12,268			13,094
Addition to (recovery of) valuation allowance on mortgage servicing rights, net	243			(156		)
Amortization of mortgage servicing rights	3,179			2,725
Amortization of other intangible assets	801			991
Amortization and accretion on earning assets, funding, and other, net	9,572			6,537
Tax impact of stock based compensation	638			545
Gain on sales of investment securities, net	—			(378		)
Gain on sales of assets and impairment write-downs, net	(1,096		)	(728		)
Gain on mortgage banking activities, net	(3,141		)	(4,100		)
Mortgage loans originated and acquired for sale	(268,296		)	(203,764		)
Proceeds from sales of mortgage loans held for sale	238,399			224,348
Increase in interest receivable	(2,186		)	(3,009		)
Decrease in interest payable	(948		)	(6,474		)
Net change in other assets and other liabilities	(23,058		)	(6,165		)
Net cash provided by operating activities	17,547			73,665
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in loans	(368,794		)	(555,979		)
Purchases of:
Available for sale securities	(202,615		)	(273,627		)
Held to maturity securities	(36,788		)	(18,857		)
FHLB stock	(115		)	(111		)
Premises, equipment, and software, net of disposals	(13,944		)	(10,848		)
Other assets	(1,207		)	(850		)
Proceeds from:
Sales of available for sale securities	289			80,025
Prepayments, calls, and maturities of available for sale securities	282,835			180,880
Prepayments, calls, and maturities of other assets	5,155			11,036
Net cash received in acquisition	1,202			—
Net cash used in investing activities	(333,982		)	(588,331		)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	1,088,088			242,760
Net increase (decrease) in short-term funding	(405,751		)	506,980
Repayment of long-term funding	(500,009		)	(155,009		)
Purchase of common stock returned to authorized but unissued	(30,000		)	—
Purchase of preferred stock	—			(806		)
Cash dividends on common stock	(15,280		)	(14,639		)
Cash dividends on preferred stock	(1,228		)	(1,244		)
Purchase of treasury stock	(4,105		)	(42,199		)
Net cash provided by financing activities	131,715			535,843
Net increase (decrease) in cash and cash equivalents	(184,720		)	21,177
Cash and cash equivalents at beginning of period	1,032,067			602,245
Cash and cash equivalents at end of period	$	847,347		$	623,422
Supplemental disclosures of cash flow information:
Cash paid for interest	$	19,643		$	19,578
Cash paid for income taxes	—			4,165
Loans and bank premises transferred to other real estate owned	2,104			6,343
Capitalized mortgage servicing rights	3,010			1,725
Acquisition:
Fair value of assets acquired, including cash and cash equivalents	5,160			—
Fair value ascribed to goodwill and intangible assets	51,221			—
Fair value of liabilities assumed	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 Associated Banc-Corp’s 2014 annual report on Form 10-K, should be referred to in connection with the reading of these unaudited interim financial statements.

NOTE 1: 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.

NOTE 2: Acquisition

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.

NOTE 3: New Accounting Pronouncements Adopted

In August 2014, the FASB issued an amendment to clarify how creditors are to classify certain government-guaranteed mortgage loans upon foreclosure. This amendment requires that a mortgage loan be derecognized and a separate other receivable be recognized upon foreclosure if the following conditions are met: (1) the loan has a government guarantee that is not separate from the loan before foreclosure and (2) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under the claim and (3) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. This amendment is effective for annual reporting periods, including interim periods within those annual periods, beginning after December 15, 2014. Entities may apply the amendments in this update either (a) prospectively to foreclosures that occur after the date of adoption or (b) modified retrospective transition using a cumulative-effect adjustment (through a reclassification to a separate other receivable) as of the beginning of the annual period of adoption. Prior periods should not be adjusted. The Corporation adopted the accounting standard on a prospective basis during the first quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity.

In June 2014, the FASB issued an amendment to clarify the current accounting and disclosures for certain repurchase agreements. The amendments in this update require two accounting changes: (1) change the accounting for repurchase-to-maturity transactions to secured borrowing accounting and (2) require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. The amendments in this update also require additional disclosures for certain transactions on the transfer of financial

8

assets, as well as new disclosures for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings. This amendment is effective for public business entities for the first interim or annual period beginning after December 15, 2014. Early application is prohibited. The Corporation adopted the accounting standard during the first quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity.

In January 2014, the FASB issued an amendment to clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar agreement. In addition, the amendments require interim and annual disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure in accordance with local requirements of the applicable jurisdiction. This amendment is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. An entity can elect to adopt the amendments using either a modified retrospective method or a prospective transition method. The Corporation adopted the accounting standard using the prospective transition method during the first quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity.

In January 2014, the FASB issued an amendment which permits reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). For those investments in qualified affordable housing projects not accounted for using the proportional method, the investment should be accounted for as an equity method investment or a cost method investment. The decision to apply the proportional amortization method of accounting is an accounting policy decision that should be applied consistently to all qualifying affordable housing project investments rather than a decision to be applied to individual investments. This amendment should be applied retrospectively to all periods presented. A reporting entity that uses the effective yield method to account for its investments in qualified affordable housing projects before the date of adoption may continue to apply the effective yield method for those preexisting investments. This amendment is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. The Corporation made an accounting policy election to use the proportional amortization method for investments in qualified affordable housing projects during the first quarter of 2015, which had no material impact on the results of operations, financial position, or liquidity.

9

NOTE 4: Earnings Per Common Share

Earnings per 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, and outstanding stock warrants). Presented below are the calculations for basic and diluted earnings per common share.

	For the Three Months Ended March 31,
	2015			2014
	(In Thousands, except per share data)
Net income	$	46,672		$	45,199
Preferred stock dividends	(1,228		)	(1,244		)
Net income available to common equity	$	45,444		$	43,955
Common shareholder dividends	(15,166		)	(14,488		)
Dividends on unvested share-based payment awards	(114		)	(151		)
Undistributed earnings	$	30,164		$	29,316
Undistributed earnings allocated to common shareholders	29,886			29,126
Undistributed earnings allocated to unvested share-based payment awards	278			190
Undistributed earnings	$	30,164		$	29,316
Basic
Distributed earnings to common shareholders	$	15,166		$	14,488
Undistributed earnings allocated to common shareholders	29,886			29,126
Total common shareholders earnings, basic	$	45,052		$	43,614
Diluted
Distributed earnings to common shareholders	$	15,166		$	14,488
Undistributed earnings allocated to common shareholders	29,886			29,126
Total common shareholders earnings, diluted	$	45,052		$	43,614
Weighted average common shares outstanding	150,070			161,467
Effect of dilutive common stock awards	1,094			721
Diluted weighted average common shares outstanding	151,164			162,188
Basic earnings per common share	$	0.30		$	0.27
Diluted earnings per common share	$	0.30		$	0.27

Options to purchase approximately 2 million and 3 million common shares were outstanding for the three months ended March 31, 2015 and 2014, respectively, but excluded from the calculation of diluted earnings per common share as the effect would have been anti-dilutive.

NOTE 5: Stock-Based Compensation

At March 31, 2015, the Corporation had one stock-based compensation plan, the 2013 Incentive Compensation Plan. All stock options granted under this plan have an exercise price that is equal to the closing price of the Corporation’s stock on the grant date.

The Corporation also 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

10

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”).

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. Beginning with the 2014 grants, expenses related to stock options and restricted stock 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 2015 and full year 2014.

	2015		2014
Dividend yield	2.00	%	2.00	%
Risk-free interest rate	2.00	%	2.00	%
Weighted average expected volatility	20.00	%	20.00	%
Weighted average expected life	6 years		6 years
Weighted average per share fair value of options	$3.08		$3.00

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 compensation expense to be recognized in future periods.

A summary of the Corporation’s stock option activity for the year ended December 31, 2014 and for three months ended March 31, 2015, is presented below.

Stock Options	Shares		Weighted Average Exercise Price	Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value (000s)
Outstanding at December 31, 2013	8,034,243		$18.37
Granted	1,389,452		$17.45
Exercised	(933,143	)	$13.77
Forfeited or expired	(643,214	)	$23.50
Outstanding at December 31, 2014	7,847,338		$18.34	5.79	$	23,986
Options exercisable at December 31, 2014	5,076,676		$19.96	4.41	$	14,953
Granted	1,348,504		$17.95
Exercised	(366,670	)	$13.84
Forfeited or expired	(495,890	)	$32.00
Outstanding at March 31, 2015	8,333,282		$17.71	6.60	$	22,821
Options exercisable at March 31, 2015	5,536,852		$18.02	5.28	$	18,637

The following table summarizes information about the Corporation’s nonvested stock option activity for the year ended December 31, 2014, and for the three months ended March 31, 2015.

11

Nonvested Stock Options	Shares		Weighted Average Grant Date Fair Value
Nonvested at December 31, 2013	3,110,523		$4.69
Granted	1,389,452		$3.00
Vested	(1,522,152	)	$4.92
Forfeited	(207,161	)	$4.38
Nonvested at December 31, 2014	2,770,662		$3.74
Granted	1,348,504		$3.08
Vested	(1,313,007	)	$4.31
Forfeited	(9,729	)	$3.35
Nonvested at March 31, 2015	2,796,430		$3.16

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, 2015, the intrinsic value of stock options exercised was $2 million. For the year ended December 31, 2014, the intrinsic value of stock options exercised was $4 million. The total fair value of stock options that vested was $6 million for the three months ended March 31, 2015 and $7 million for the year ended December 31, 2014. The Corporation recognized compensation expense for the vesting of stock options of $1 million and $2 million for the three months ended March 31, 2015 and 2014, respectively. For the full year 2014, the Corporation recognized compensation expense of $6 million for the vesting of stock options. At March 31, 2015, 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 fourth quarter 2018.

The following table summarizes information about the Corporation’s restricted stock awards activity for the year ended December 31, 2014, and for three months ended March 31, 2015.

Restricted Stock	Shares		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2013	1,511,765		$13.92
Granted	1,177,168		$17.35
Vested	(538,877	)	$14.12
Forfeited	(167,930	)	$15.26
Outstanding at December 31, 2014	1,982,126		$15.79
Granted	1,029,339		$16.77
Vested	(619,358	)	$15.52
Forfeited	(18,834	)	$16.13
Outstanding at March 31, 2015	2,373,273		$16.28

The Corporation amortizes the expense related to restricted stock awards as compensation expense over the vesting period specified in the grant. Restricted stock awards granted during 2014 and 2015 will vest ratably over a four year period. Expense for restricted stock awards of approximately $5 million and $3 million was recognized for the three months ended March 31, 2015 and 2014, respectively. The Corporation recognized approximately $10 million of expense for restricted stock awards for the full year 2014. Included in compensation expense for three months ended March 31, 2015 was approximately $700,000 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, 2015 that is expected to be recognized over the remaining requisite service periods that extend predominantly through fourth quarter 2018.

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.

12

NOTE 6: Investment Securities

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

March 31, 2015:	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
	($ in Thousands)
Investment securities available for sale:
U.S. Treasury securities	$	999	$	3	$	—		$	1,002
Obligations of state and political subdivisions (municipal securities)	501,679		22,912		(4		)	524,587
Residential mortgage-related securities:
Government-sponsored enterprise (“GSE”)	3,613,144		73,227		(11,257		)	3,675,114
Private-label	1,962		1		(10		)	1,953
GSE commercial mortgage-related securities	1,158,217		6,114		(15,075		)	1,149,256
Other securities (debt and equity)	6,338		60		—			6,398
Total investment securities available for sale	$	5,282,339	$	102,317	$	(26,346	)	$	5,358,310
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	$	438,047	$	9,482	$	(832	)	$	446,697
Total investment securities held to maturity	$	438,047	$	9,482	$	(832	)	$	446,697
December 31, 2014:	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
	($ in Thousands)
Investment securities available for sale:
U.S. Treasury securities	$	999	$	—	$	(1	)	$	998
Obligations of state and political subdivisions (municipal securities)	560,839		21,869		(29		)	582,679
Residential mortgage-related securities:
GSE	3,700,103		61,236		(30,550		)	3,730,789
Private-label	2,297		7		(10		)	2,294
GSE commercial mortgage-related securities	1,097,913		1,922		(25,942		)	1,073,893
Other securities (debt and equity)	6,108		51		—			6,159
Total investment securities available for sale	$	5,368,259	$	85,085	$	(56,532	)	$	5,396,812
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	$	404,455	$	9,444	$	(832	)	$	413,067
Total investment securities held to maturity	$	404,455	$	9,444	$	(832	)	$	413,067

13

The amortized cost and fair values of investment securities available for sale and held to maturity at March 31, 2015, 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	$	40,879	$	41,115		$	—	$	—
Due after one year through five years	233,433		245,483			2,253		2,291
Due after five years through ten years	234,102		244,730			122,372		124,896
Due after ten years	584		609			313,422		319,510
Total debt securities	508,998		531,937			438,047		446,697
Residential mortgage-related securities:
GSE	3,613,144		3,675,114			—		—
Private-label	1,962		1,953			—		—
GSE commercial mortgage-related securities	1,158,217		1,149,256			—		—
Equity securities	18		50			—		—
Total investment securities	$	5,282,339	$	5,358,310		$	438,047	$	446,697
Ratio of Fair Value to Amortized Cost			101.4		%			102.0		%

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 March 31, 2015.

	Less than 12 months						12 months or more						Total
March 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:
Obligations of state and political subdivisions (municipal securities)	2	$	(1	)	$	629	1	$	(3	)	$	186	$	(4	)	$	815
Residential mortgage-related securities:
GSE	22	(805		)	204,345		43	(10,452		)	1,060,452		(11,257		)	1,264,797
Private-label	1	(9		)	1,750		2	(1		)	24		(10		)	1,774
GSE commercial mortgage-related securities	4	(95		)	99,052		20	(14,980		)	455,874		(15,075		)	554,926
Total		$	(910	)	$	305,776		$	(25,436	)	$	1,516,536	$	(26,346	)	$	1,822,312
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	163	$	(568	)	$	73,163	21	$	(264	)	$	9,552	$	(832	)	$	82,715
Total		$	(568	)	$	73,163		$	(264	)	$	9,552	$	(832	)	$	82,715

14

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, 2014.

	Less than 12 months						12 months or more						Total
December 31, 2014	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	$	(1	)	$	998	—	$	—		$	—	$	(1	)	$	998
Obligations of state and political subdivisions (municipal securities)	6	(9		)	3,374		6	(20		)	2,133		(29		)	5,507
Residential mortgage-related securities:
GSE	16	(1,404		)	333,713		56	(29,146		)	1,256,533		(30,550		)	1,590,246
Private-label	1	(9		)	1,772		2	(1		)	27		(10		)	1,799
GSE commercial mortgage-related securities	9	(1,766		)	329,982		20	(24,176		)	460,425		(25,942		)	790,407
Total		$	(3,189	)	$	669,839		$	(53,343	)	$	1,719,118	$	(56,532	)	$	2,388,957
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	74	$	(216	)	$	31,924	85	$	(616	)	$	38,915	$	(832	)	$	70,839
Total		$	(216	)	$	31,924		$	(616	)	$	38,915	$	(832	)	$	70,839

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. In addition, with regards to its debt securities, the Corporation may also evaluate payment structure, whether there are defaulted payments or expected defaults, prepayment speeds, and the value of any underlying collateral.

Based on the Corporation’s evaluation, management does not believe any unrealized loss at March 31, 2015 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 residential mortgage-related securities relate to private-label residential mortgage-related securities as well as residential mortgage-related securities issued by government-sponsored enterprises such as the Government National Mortgage Association (“GNMA”), the Federal National Mortgage Association (“FNMA”) and the Federal Home Loan Mortgage Corporation (“FHLMC”). The unrealized losses reported for commercial mortgage-related securities relate to securities issued by GNMA. 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 improvement in the unrealized loss position of the investment securities portfolio was due to a reduction in the overall level of interest rates from December 31, 2014 to March 31, 2015. Since December 31, 2014, the three-year and ten-year U.S. Treasury note rates declined approximately 20 basis points ("bp") and 25 bp, respectively.

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. The Corporation had FHLB stock of $118 million at both March 31, 2015 and December 31, 2014 and Federal Reserve Bank stock of $71 million at both March 31, 2015 and December 31, 2014.

15

NOTE 7: Loans, Allowance for Credit Losses, and Credit Quality

The period end loan composition was as follows.

	March 31, 2015		December 31, 2014
	($ in Thousands)
Commercial and industrial	$	6,140,420	$	5,905,902
Commercial real estate - owner occupied	1,003,885		1,007,937
Lease financing	49,496		51,529
Commercial and business lending	7,193,801		6,965,368
Commercial real estate - investor	3,086,980		3,056,485
Real estate construction	1,019,571		1,008,956
Commercial real estate lending	4,106,551		4,065,441
Total commercial	11,300,352		11,030,809
Home equity	1,583,614		1,636,058
Installment and credit cards	436,492		454,219
Residential mortgage	4,658,574		4,472,760
Total consumer	6,678,680		6,563,037
Total loans	$	17,979,032	$	17,593,846

A summary of the changes in the allowance for credit losses was as follows.

	Three Months Ended March 31, 2015			Year Ended December 31, 2014
	($ in Thousands)
Allowance for Loan Losses:
Balance at beginning of period	$	266,302		$	268,315
Provision for loan losses	4,500			13,000
Charge offs	(13,270		)	(44,096		)
Recoveries	7,736			29,083
Net charge offs	(5,534		)	(15,013		)
Balance at end of period	$	265,268		$	266,302
Allowance for Unfunded Commitments:
Balance at beginning of period	$	24,900		$	21,900
Provision for unfunded commitments	—			3,000
Balance at end of period	$	24,900		$	24,900
Allowance for Credit Losses	$	290,168		$	291,202

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. In general, the change in the allowance for loan losses is a function of a number of factors, including but not limited to changes in the loan portfolio, net charge offs, trends in past due and impaired loans, and the level of potential problem loans. Management considers the allowance for loan losses a critical accounting policy, as assessing these numerous factors involves significant judgment.

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. The determination of the appropriate level of the allowance for unfunded commitments is based upon an evaluation of the unfunded credit facilities, including an assessment of historical commitment utilization experience and credit risk grading of the loan. Net adjustments to the allowance for unfunded commitments are included in provision for credit losses in the consolidated statements of income. See Note 13 for additional information on the allowance for unfunded commitments.

16

A summary of the changes in the allowance for loan losses by portfolio segment for the three months ended March 31, 2015, was as follows.

$ in Thousands	Commercial and industrial			Commercial real estate - owner occupied			Lease financing			Commercial real estate - investor			Real estate construction			Home equity			Installment and credit cards			Residential mortgage			Total
Balance at Dec 31, 2014	$	116,025		$	16,510		$	1,610		$	46,333		$	20,999		$	30,359		$	6,435		$	28,031		$	266,302
Provision for loan losses	6,836			3,753			(130		)	(4,503		)	(402		)	348			359			(1,761		)	4,500
Charge offs	(6,829		)	(879		)	—			(1,002		)	—			(2,674		)	(938		)	(948		)	(13,270		)
Recoveries	2,179			140			—			3,531			743			669			169			305			7,736
Balance at Mar 31, 2015	$	118,211		$	19,524		$	1,480		$	44,359		$	21,340		$	28,702		$	6,025		$	25,627		$	265,268
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment	$	5,591		$	910		$	510		$	689		$	240		$	10		$	—		$	226		$	8,176
Ending balance impaired loans collectively evaluated for impairment	$	2,038		$	1,149		$	—		$	1,339		$	801		$	12,350		$	264		$	11,269		$	29,210
Total impaired loans	$	7,629		$	2,059		$	510		$	2,028		$	1,041		$	12,360		$	264		$	11,495		$	37,386
Ending balance all other loans collectively evaluated for impairment	$	110,582		$	17,465		$	970		$	42,331		$	20,299		$	16,342		$	5,761		$	14,132		$	227,882
Total	$	118,211		$	19,524		$	1,480		$	44,359		$	21,340		$	28,702		$	6,025		$	25,627		$	265,268
Loans:
Ending balance impaired loans individually evaluated for impairment	$	58,091		$	17,133		$	1,720		$	10,297		$	3,843		$	911		$	—		$	9,761		$	101,756
Ending balance impaired loans collectively evaluated for impairment	$	29,995		$	14,508		$	—		$	26,220		$	2,297		$	29,255		$	1,406		$	57,726		$	161,407
Total impaired loans	$	88,086		$	31,641		$	1,720		$	36,517		$	6,140		$	30,166		$	1,406		$	67,487		$	263,163
Ending balance all other loans collectively evaluated for impairment	$	6,052,334		$	972,244		$	47,776		$	3,050,463		$	1,013,431		$	1,553,448		$	435,086		$	4,591,087		$	17,715,869
Total	$	6,140,420		$	1,003,885		$	49,496		$	3,086,980		$	1,019,571		$	1,583,614		$	436,492		$	4,658,574		$	17,979,032

The allocation methodology used by the Corporation includes allocations for specifically identified impaired loans and loss factor allocations (used for both criticized and non-criticized loan categories), with a component primarily based on historical loss rates and a component primarily based on other qualitative factors. Management allocates the allowance for loan losses by pools of risk within each loan portfolio. The allocation of the allowance for loan losses by loan portfolio is made for analytical purposes and is not necessarily indicative of the trend of future loan losses in any particular category. At March 31, 2015, $27 million of the commercial and industrial allowance for loan losses was attributable to Oil and Gas related credits, compared to $17 million at December 31, 2014. This allocated allowance for loan losses represented 3.46% and 2.26% of period end Oil and Gas related loans at March 31, 2015 and December 31, 2014, respectively. The total allowance for loan losses is available to absorb losses from any segment of the loan portfolio.

17

For comparison purposes, a summary of the changes in the allowance for loan losses by portfolio segment for the year ended December 31, 2014, was as follows.

$ in Thousands	Commercial and industrial			Commercial real estate - owner occupied			Lease financing			Commercial real estate - investor			Real estate construction			Home equity			Installment and credit cards			Residential mortgage			Total
Balance at Dec 31, 2013	$	104,501		$	19,476		$	1,607		$	58,156		$	23,418		$	32,196		$	2,416		$	26,545		$	268,315
Provision for loan losses	14,767			(1,296		)	35			(17,290		)	(1,277		)	7,087			6,279			4,695			13,000
Charge offs	(14,633		)	(3,476		)	(39		)	(4,529		)	(1,958		)	(12,332		)	(2,876		)	(4,253		)	(44,096		)
Recoveries	11,390			1,806			7			9,996			816			3,408			616			1,044			29,083
Balance at Dec 31, 2014	$	116,025		$	16,510		$	1,610		$	46,333		$	20,999		$	30,359		$	6,435		$	28,031		$	266,302
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment	$	13,615		$	1,490		$	574		$	1,649		$	328		$	11		$	—		$	199		$	17,866
Ending balance impaired loans collectively evaluated for impairment	$	2,852		$	1,731		$	—		$	1,938		$	767		$	13,004		$	308		$	11,965		$	32,565
Total impaired loans	$	16,467		$	3,221		$	574		$	3,587		$	1,095		$	13,015		$	308		$	12,164		$	50,431
Ending balance all other loans collectively evaluated for impairment	$	99,558		$	13,289		$	1,036		$	42,746		$	19,904		$	17,344		$	6,127		$	15,867		$	215,871
Total	$	116,025		$	16,510		$	1,610		$	46,333		$	20,999		$	30,359		$	6,435		$	28,031		$	266,302
Loans:
Ending balance impaired loans individually evaluated for impairment	$	45,118		$	20,731		$	1,801		$	19,683		$	3,776		$	962		$	—		$	9,751		$	101,822
Ending balance impaired loans collectively evaluated for impairment	$	38,437		$	15,548		$	—		$	26,129		$	2,350		$	30,845		$	1,587		$	58,911		$	173,807
Total impaired loans	$	83,555		$	36,279		$	1,801		$	45,812		$	6,126		$	31,807		$	1,587		$	68,662		$	275,629
Ending balance all other loans collectively evaluated for impairment	$	5,822,347		$	971,658		$	49,728		$	3,010,673		$	1,002,830		$	1,604,251		$	452,632		$	4,404,098		$	17,318,217
Total	$	5,905,902		$	1,007,937		$	51,529		$	3,056,485		$	1,008,956		$	1,636,058		$	454,219		$	4,472,760		$	17,593,846

The following table presents commercial loans by credit quality indicator at March 31, 2015.

	Pass		Special Mention		Potential Problem		Impaired		Total
	($ in Thousands)
Commercial and industrial	$	5,820,038	$	93,893	$	138,403	$	88,086	$	6,140,420
Commercial real estate - owner occupied	911,673		17,457		43,114		31,641		1,003,885
Lease financing	44,857		910		2,009		1,720		49,496
Commercial and business lending	6,776,568		112,260		183,526		121,447		7,193,801
Commercial real estate - investor	3,013,499		10,938		26,026		36,517		3,086,980
Real estate construction	1,011,271		673		1,487		6,140		1,019,571
Commercial real estate lending	4,024,770		11,611		27,513		42,657		4,106,551
Total commercial	$	10,801,338	$	123,871	$	211,039	$	164,104	$	11,300,352

18

The following table presents commercial loans by credit quality indicator at December 31, 2014.

	Pass		Special Mention		Potential Problem		Impaired		Total
	($ in Thousands)
Commercial and industrial	$	5,594,497	$	119,328	$	108,522	$	83,555	$	5,905,902
Commercial real estate - owner occupied	904,526		18,437		48,695		36,279		1,007,937
Lease financing	46,931		88		2,709		1,801		51,529
Commercial and business lending	6,545,954		137,853		159,926		121,635		6,965,368
Commercial real estate - investor	2,974,493		12,137		24,043		45,812		3,056,485
Real estate construction	998,972		2,082		1,776		6,126		1,008,956
Commercial real estate lending	3,973,465		14,219		25,819		51,938		4,065,441
Total commercial	$	10,519,419	$	152,072	$	185,745	$	173,573	$	11,030,809

The following table presents consumer loans by credit quality indicator at March 31, 2015.

	Performing		30-89 Days Past Due		Potential Problem		Impaired		Total
	($ in Thousands)
Home equity	$	1,542,482	$	10,008	$	958	$	30,166	$	1,583,614
Installment and credit cards	433,268		1,818		—		1,406		436,492
Residential mortgage	4,581,063		3,403		6,621		67,487		4,658,574
Total consumer	$	6,556,813	$	15,229	$	7,579	$	99,059	$	6,678,680

The following table presents consumer loans by credit quality indicator at December 31, 2014.

	Performing		30-89 Days Past Due		Potential Problem		Impaired		Total
	($ in Thousands)
Home equity	$	1,592,788	$	10,583	$	880	$	31,807	$	1,636,058
Installment and credit cards	450,698		1,932		2		1,587		454,219
Residential mortgage	4,397,271		3,046		3,781		68,662		4,472,760
Total consumer	$	6,440,757	$	15,561	$	4,663	$	102,056	$	6,563,037

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 impaired 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.

19

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

	30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due (a)		Total Past Due		Current		Total
	($ in Thousands)
Accruing loans
Commercial and industrial	$	1,281	$	436	$	197	$	1,914	$	6,076,886	$	6,078,800
Commercial real estate - owner occupied	1,849		—		—		1,849		980,175		982,024
Lease financing	—		—		—		—		47,776		47,776
Commercial and business lending	3,130		436		197		3,763		7,104,837		7,108,600
Commercial real estate - investor	1,767		448		—		2,215		3,071,023		3,073,238
Real estate construction	317		—		—		317		1,013,831		1,014,148
Commercial real estate lending	2,084		448		—		2,532		4,084,854		4,087,386
Total commercial	5,214		884		197		6,295		11,189,691		11,195,986
Home equity	8,637		1,371		85		10,093		1,553,094		1,563,187
Installment and credit cards	1,180		638		1,433		3,251		432,726		435,977
Residential mortgage	3,302		101		—		3,403		4,606,133		4,609,536
Total consumer	13,119		2,110		1,518		16,747		6,591,953		6,608,700
Total accruing loans	$	18,333	$	2,994	$	1,715	$	23,042	$	17,781,644	$	17,804,686
Nonaccrual loans
Commercial and industrial	$	5,828	$	3,415	$	9,935	$	19,178	$	42,442	$	61,620
Commercial real estate - owner occupied	2,275		185		8,644		11,104		10,757		21,861
Lease financing	—		—		513		513		1,207		1,720
Commercial and business lending	8,103		3,600		19,092		30,795		54,406		85,201
Commercial real estate - investor	175		—		5,395		5,570		8,172		13,742
Real estate construction	1,350		173		872		2,395		3,028		5,423
Commercial real estate lending	1,525		173		6,267		7,965		11,200		19,165
Total commercial	9,628		3,773		25,359		38,760		65,606		104,366
Home equity	1,318		1,829		9,578		12,725		7,702		20,427
Installment and credit cards	33		35		154		222		293		515
Residential mortgage	3,276		3,321		17,531		24,128		24,910		49,038
Total consumer	4,627		5,185		27,263		37,075		32,905		69,980
Total nonaccrual loans (b)	$	14,255	$	8,958	$	52,622	$	75,835	$	98,511	$	174,346
Total loans
Commercial and industrial	$	7,109	$	3,851	$	10,132	$	21,092	$	6,119,328	$	6,140,420
Commercial real estate - owner occupied	4,124		185		8,644		12,953		990,932		1,003,885
Lease financing	—		—		513		513		48,983		49,496
Commercial and business lending	11,233		4,036		19,289		34,558		7,159,243		7,193,801
Commercial real estate - investor	1,942		448		5,395		7,785		3,079,195		3,086,980
Real estate construction	1,667		173		872		2,712		1,016,859		1,019,571
Commercial real estate lending	3,609		621		6,267		10,497		4,096,054		4,106,551
Total commercial	14,842		4,657		25,556		45,055		11,255,297		11,300,352
Home equity	9,955		3,200		9,663		22,818		1,560,796		1,583,614
Installment and credit cards	1,213		673		1,587		3,473		433,019		436,492
Residential mortgage	6,578		3,422		17,531		27,531		4,631,043		4,658,574
Total consumer	17,746		7,295		28,781		53,822		6,624,858		6,678,680
Total loans	$	32,588	$	11,952	$	54,337	$	98,877	$	17,880,155	$	17,979,032

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

(b) The percent of nonaccrual loans which are current was 57% at March 31, 2015.

20

The following table presents loans by past due status at December 31, 2014.

	30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due (a)		Total Past Due		Current		Total
	($ in Thousands)
Accruing loans
Commercial and industrial	$	4,466	$	10,281	$	254	$	15,001	$	5,841,238	$	5,856,239
Commercial real estate - owner occupied	8,429		2,199		—		10,628		971,484		982,112
Lease financing	—		—		—		—		49,728		49,728
Commercial and business lending	12,895		12,480		254		25,629		6,862,450		6,888,079
Commercial real estate - investor	712		496		—		1,208		3,032,592		3,033,800
Real estate construction	951		33		—		984		1,002,573		1,003,557
Commercial real estate lending	1,663		529		—		2,192		4,035,165		4,037,357
Total commercial	14,558		13,009		254		27,821		10,897,615		10,925,436
Home equity	8,037		2,546		52		10,635		1,603,682		1,614,317
Installment and credit cards	1,186		746		1,317		3,249		450,357		453,606
Residential mortgage	2,840		206		—		3,046		4,420,028		4,423,074
Total consumer	12,063		3,498		1,369		16,930		6,474,067		6,490,997
Total accruing loans	$	26,621	$	16,507	$	1,623	$	44,751	$	17,371,682	$	17,416,433
Nonaccrual loans
Commercial and industrial	$	872	$	627	$	10,154	$	11,653	$	38,010	$	49,663
Commercial real estate - owner occupied	3,197		41		8,596		11,834		13,991		25,825
Lease financing	—		—		513		513		1,288		1,801
Commercial and business lending	4,069		668		19,263		24,000		53,289		77,289
Commercial real estate - investor	1,857		459		12,765		15,081		7,604		22,685
Real estate construction	87		73		798		958		4,441		5,399
Commercial real estate lending	1,944		532		13,563		16,039		12,045		28,084
Total commercial	6,013		1,200		32,826		40,039		65,334		105,373
Home equity	1,615		2,306		10,602		14,523		7,218		21,741
Installment and credit cards	96		39		141		276		337		613
Residential mortgage	5,028		2,653		19,730		27,411		22,275		49,686
Total consumer	6,739		4,998		30,473		42,210		29,830		72,040
Total nonaccrual loans (b)	$	12,752	$	6,198	$	63,299	$	82,249	$	95,164	$	177,413
Total loans
Commercial and industrial	$	5,338	$	10,908	$	10,408	$	26,654	$	5,879,248	$	5,905,902
Commercial real estate - owner occupied	11,626		2,240		8,596		22,462		985,475		1,007,937
Lease financing	—		—		513		513		51,016		51,529
Commercial and business lending	16,964		13,148		19,517		49,629		6,915,739		6,965,368
Commercial real estate - investor	2,569		955		12,765		16,289		3,040,196		3,056,485
Real estate construction	1,038		106		798		1,942		1,007,014		1,008,956
Commercial real estate lending	3,607		1,061		13,563		18,231		4,047,210		4,065,441
Total commercial	20,571		14,209		33,080		67,860		10,962,949		11,030,809
Home equity	9,652		4,852		10,654		25,158		1,610,900		1,636,058
Installment and credit cards	1,282		785		1,458		3,525		450,694		454,219
Residential mortgage	7,868		2,859		19,730		30,457		4,442,303		4,472,760
Total consumer	18,802		8,496		31,842		59,140		6,503,897		6,563,037
Total loans	$	39,373	$	22,705	$	64,922	$	127,000	$	17,466,846	$	17,593,846

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2014 (the same as the reported balances for the accruing loans noted above).

(b) The percent of nonaccrual loans which are current was 54% at December 31, 2014.

21

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

	Recorded Investment		Unpaid Principal Balance		Related Allowance		YTD Average Recorded Investment		YTD Interest Income Recognized (a)
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	58,274	$	59,809	$	7,629	$	58,815	$	265
Commercial real estate - owner occupied	20,147		22,390		2,059		20,448		123
Lease financing	1,720		1,720		510		1,747		—
Commercial and business lending	80,141		83,919		10,198		81,010		388
Commercial real estate - investor	32,244		35,466		2,028		32,338		287
Real estate construction	2,967		4,354		1,041		2,987		17
Commercial real estate lending	35,211		39,820		3,069		35,325		304
Total commercial	115,352		123,739		13,267		116,335		692
Home equity	29,430		32,827		12,360		29,709		326
Installment and credit cards	1,406		1,618		264		1,437		9
Residential mortgage	60,444		64,709		11,495		60,761		495
Total consumer	91,280		99,154		24,119		91,907		830
Total loans	$	206,632	$	222,893	$	37,386	$	208,242	$	1,522
Loans with no related allowance
Commercial and industrial	$	29,812	$	38,438	$	—	$	30,561	$	104
Commercial real estate - owner occupied	11,494		13,672		—		11,753		—
Lease financing	—		—		—		—		—
Commercial and business lending	41,306		52,110		—		42,314		104
Commercial real estate - investor	4,273		6,565		—		4,954		8
Real estate construction	3,173		3,959		—		3,111		—
Commercial real estate lending	7,446		10,524		—		8,065		8
Total commercial	48,752		62,634		—		50,379		112
Home equity	736		763		—		766		2
Installment and credit cards	—		—		—		—		—
Residential mortgage	7,043		7,297		—		7,050		25
Total consumer	7,779		8,060		—		7,816		27
Total loans	$	56,531	$	70,694	$	—	$	58,195	$	139
Total
Commercial and industrial	$	88,086	$	98,247	$	7,629	$	89,376	$	369
Commercial real estate - owner occupied	31,641		36,062		2,059		32,201		123
Lease financing	1,720		1,720		510		1,747		—
Commercial and business lending	121,447		136,029		10,198		123,324		492
Commercial real estate - investor	36,517		42,031		2,028		37,292		295
Real estate construction	6,140		8,313		1,041		6,098		17
Commercial real estate lending	42,657		50,344		3,069		43,390		312
Total commercial	164,104		186,373		13,267		166,714		804
Home equity	30,166		33,590		12,360		30,475		328
Installment and credit cards	1,406		1,618		264		1,437		9
Residential mortgage	67,487		72,006		11,495		67,811		520
Total consumer	99,059		107,214		24,119		99,723		857
Total loans (b)	$	263,163	$	293,587	$	37,386	$	266,437	$	1,661

(a) Interest income recognized included $1 million of interest income recognized on accruing restructured loans for the three months ended March 31, 2015

(b) The implied fair value mark on all impaired loans at March 31, 2015, was 77% of their unpaid principal balance. The fair value mark is calculated as the recorded investment, net of the related allowance, divided by the unpaid principal balance.

22

The following table presents impaired loans at December 31, 2014.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		YTD Average Recorded Investment		YTD Interest Income Recognized (a)
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	76,433	$	80,414	$	16,467	$	80,004	$	3,139
Commercial real estate - owner occupied	19,839		21,807		3,221		20,878		681
Lease financing	1,801		1,801		574		2,009		—
Commercial and business lending	98,073		104,022		20,262		102,891		3,820
Commercial real estate - investor	36,841		40,869		3,587		38,657		1,250
Real estate construction	3,043		5,910		1,095		3,818		105
Commercial real estate lending	39,884		46,779		4,682		42,475		1,355
Total commercial	137,957		150,801		24,944		145,366		5,175
Home equity	31,021		34,727		13,015		32,375		1,510
Installment and credit cards	1,587		1,795		308		1,736		58
Residential mortgage	61,601		65,863		12,164		62,742		2,054
Total consumer	94,209		102,385		25,487		96,853		3,622
Total loans	$	232,166	$	253,186	$	50,431	$	242,219	$	8,797
Loans with no related allowance
Commercial and industrial	$	7,122	$	12,634	$	—	$	8,851	$	82
Commercial real estate - owner occupied	16,440		19,019		—		17,970		219
Lease financing	—		—		—		—		—
Commercial and business lending	23,562		31,653		—		26,821		301
Commercial real estate - investor	8,971		14,036		—		10,014		133
Real estate construction	3,083		3,815		—		3,241		—
Commercial real estate lending	12,054		17,851		—		13,255		133
Total commercial	35,616		49,504		—		40,076		434
Home equity	786		806		—		851		18
Installment and credit cards	—		—		—		—		—
Residential mortgage	7,061		7,315		—		7,224		135
Total consumer	7,847		8,121		—		8,075		153
Total loans	$	43,463	$	57,625	$	—	$	48,151	$	587
Total
Commercial and industrial	$	83,555	$	93,048	$	16,467	$	88,855	$	3,221
Commercial real estate - owner occupied	36,279		40,826		3,221		38,848		900
Lease financing	1,801		1,801		574		2,009		—
Commercial and business lending	121,635		135,675		20,262		129,712		4,121
Commercial real estate - investor	45,812		54,905		3,587		48,671		1,383
Real estate construction	6,126		9,725		1,095		7,059		105
Commercial real estate lending	51,938		64,630		4,682		55,730		1,488
Total commercial	173,573		200,305		24,944		185,442		5,609
Home equity	31,807		35,533		13,015		33,226		1,528
Installment and credit cards	1,587		1,795		308		1,736		58
Residential mortgage	68,662		73,178		12,164		69,966		2,189
Total consumer	102,056		110,506		25,487		104,928		3,775
Total loans (b)	$	275,629	$	310,811	$	50,431	$	290,370	$	9,384

(a) Interest income recognized included $5 million of interest income recognized on accruing restructured loans for the year ended December 31, 2014.

(b) The implied fair value mark on all impaired loans at December 31, 2014, was 72% of their unpaid principal balance. The fair value mark is calculated as the recorded investment, net of the related allowance, divided by the unpaid principal balance.

23

Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Loans are generally placed on nonaccrual status when contractually past due 90 days or more as to interest or principal payments, unless the loan is well secured and in the process of collection. Additionally, whenever management becomes aware of facts or circumstances that may adversely impact the collectability of principal or interest on loans, it is management’s practice to place such loans on nonaccrual status immediately, rather than delaying such action until the loans become 90 days past due. When a loan is placed on nonaccrual status, previously accrued and uncollected interest is reversed, amortization of related deferred loan fees or costs is suspended, and income is recorded only to the extent that interest payments are subsequently received in cash and a determination has been made that the principal and interest of the loan is collectible. If collectability of the principal and interest is in doubt, payments received are applied to loan principal.

While a loan is in nonaccrual status, some or all of the cash interest payments received may be treated as interest income on a cash basis as long as the remaining recorded investment in the asset (i.e., after charge off of identified losses, if any) is deemed to be fully collectible. The determination as to the ultimate collectability of the asset’s remaining recorded investment must be supported by a current, well documented, credit evaluation of the borrower’s financial condition and prospects for repayment, including consideration of the borrower’s sustained historical repayment performance and other relevant factors. A nonaccrual loan is returned to accrual status when all delinquent principal and interest payments become current in accordance with the terms of the loan agreement, the borrower has demonstrated a period of sustained repayment performance, and the ultimate collectability of the total contractual principal and interest is no longer in doubt. A sustained period of repayment performance generally would be a minimum of six months.

Troubled Debt Restructurings (“Restructured Loans”):

Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. The concessions granted generally involve the modification of terms of the loan, such as changes in payment schedule or interest rate, which generally would not otherwise be considered. Restructured loans can involve loans remaining on nonaccrual, moving to nonaccrual, or continuing on accrual status, depending on the individual facts and circumstances of the borrower. Nonaccrual restructured loans are included and treated with all other nonaccrual loans. In addition, all accruing restructured loans are reported as troubled debt restructurings, which are considered and accounted for as impaired loans. Generally, restructured loans remain on nonaccrual until the customer has attained a sustained period of repayment performance under the modified loan terms (generally a minimum of six months). However, performance prior to the restructuring, or significant events that coincide with the restructuring, are considered in assessing whether the borrower can meet the new terms and whether the loan should be returned to or maintained on accrual status. If the borrower’s ability to meet the revised payment schedule is not reasonably assured, the loan remains on nonaccrual status. The Corporation had an $11 million recorded investment in loans modified in troubled debt restructurings for the three months ended March 31, 2015, of which $2 million was in accrual status and $9 million was in nonaccrual pending a sustained period of repayment.

All restructured loans are disclosed as restructured loans in the calendar year of restructuring. In subsequent years, a restructured loan modified at a market rate that has performed according to the modified terms for at least six months will cease being disclosed as a restructured loan. A loan that has been modified at a below market rate will return to performing status if it satisfies the six month performance requirement; however, it will remain classified as a restructured loan. The following table presents nonaccrual and performing restructured loans by loan portfolio.

	March 31, 2015				December 31, 2014
	Performing Restructured Loans		Nonaccrual Restructured Loans *		Performing Restructured Loans		Nonaccrual Restructured Loans *
	($ in Thousands)
Commercial and industrial	$	26,466	$	6,631	$	33,892	$	3,260
Commercial real estate - owner occupied	9,780		5,705		10,454		5,656
Commercial real estate - investor	22,775		8,697		23,127		15,216
Real estate construction	717		2,349		727		2,438
Home equity	9,739		6,555		10,066		7,518
Installment and credit cards	891		167		974		199
Residential mortgage	18,449		23,449		18,976		23,369
Total	$	88,817	$	53,553	$	98,216	$	57,656

* Nonaccrual restructured loans have been included with nonaccrual loans.

24

The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio for the three months ended March 31, 2015 and 2014, and the recorded investment and unpaid principal balance as of March 31, 2015 and 2014.

	Three Months Ended March 31, 2015					Three Months Ended March 31, 2014
	Number of Loans	Recorded Investment (1)		Unpaid Principal Balance (2)		Number of Loans	Recorded Investment (1)		Unpaid Principal Balance (2)
	($ in Thousands)
Commercial and industrial	2	$	196	$	208	8	$	3,446	$	7,218
Commercial real estate - owner occupied	5	3,585		3,641		4	5,298		5,781
Commercial real estate - investor	4	3,030		3,042		4	1,643		1,676
Home equity	36	1,782		1,843		30	935		1,218
Installment and credit cards	—	—		—		1	10		20
Residential mortgage	30	2,816		2,864		21	2,750		2,920
Total	77	$	11,409	$	11,598	68	$	14,082	$	18,833

(1) Represents post-modification outstanding recorded investment.

(2) 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, 2015, 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 for the three months ended March 31, 2015, primarily included maturity date extensions, interest rate concessions, payment schedule modifications, non-reaffirmed Chapter 7 bankruptcies, or a combination of these concessions.

The following table provides the number of loans modified in a troubled debt restructuring during the previous 12 months which subsequently defaulted during the three months ended March 31, 2015 and 2014, as well as the recorded investment in these restructured loans as of March 31, 2015 and 2014.

	Three Months Ended March 31, 2015			Three Months Ended March 31, 2014
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	($ in Thousands)
Commercial real estate - owner occupied	1	$	297	—	$	—
Real estate construction	—	—		1	161
Home equity	24	855		7	388
Installment and credit cards	—	—		1	10
Residential mortgage	16	1,239		12	1,761
Total	41	$	2,391	21	$	2,320

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.

NOTE 8: 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

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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 2014, 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 increases in both the Corporation’s common stock price and in the overall bank common stock index (based on the NASDAQ Bank index), as well as the Corporation’s earnings per common share trend over the past year. Based on these assessments, management concluded that the 2014 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 date of the last impairment testing that have changed the Corporation's impairment assessment conclusion.

At March 31, 2015, the Corporation had goodwill of $969 million. There was an addition to the carrying amount of goodwill of approximately $40 million for the Ahmann & Martin Co. acquisition that occurred during the quarter ended March 31, 2015. See Note 2 for additional information on the Ahmann & Martin Co. acquisition.

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. There was an addition to the gross carrying amount of other intangibles of approximately $12 million for the customer relationships acquired with the Ahmann & Martin Co. acquisition that occurred during the quarter ended March 31, 2015. See Note 2 for additional information on the Ahmann & Martin Co. acquisition. 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, 2015			Year Ended December 31, 2014
	($ in Thousands)
Core deposit intangibles:
Gross carrying amount	$	36,230		$	36,230
Accumulated amortization	(34,875		)	(34,433		)
Net book value	$	1,355		$	1,797
Amortization during the period	$	442		$	2,868
Other intangibles:
Gross carrying amount	$	30,898		$	19,283
Accumulated amortization	(14,002		)	(13,643		)
Net book value	$	16,896		$	5,640
Additions during the period	$	11,615		$	—
Amortization during the period	$	359		$	879

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 13

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for a discussion of the recourse provisions on sold residential mortgage loans. See Note 14 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, 2015			Year Ended December 31, 2014
	($ in Thousands)
Mortgage servicing rights:
Mortgage servicing rights at beginning of period	$	61,379		$	64,193
Additions	3,010			8,253
Amortization	(3,179		)	(11,067		)
Mortgage servicing rights at end of period	$	61,210		$	61,379
Valuation allowance at beginning of period	(1,234		)	(913		)
Additions, net	(243		)	(321		)
Valuation allowance at end of period	(1,477		)	(1,234		)
Mortgage servicing rights, net	$	59,733		$	60,145
Fair value of mortgage servicing rights	$	64,026		$	66,342
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	7,919,711			7,999,294
Mortgage servicing rights, net to servicing portfolio	0.75		%	0.75		%
Mortgage servicing rights expense (1)	$	3,422		$	11,388

(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, 2015. 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, 2015	$	962	$	1,299	$	8,643
Year ending December 31, 2016	281		1,696		9,596
Year ending December 31, 2017	112		1,663		7,778
Year ending December 31, 2018	—		1,633		6,338
Year ending December 31, 2019	—		1,334		5,195
Year ending December 31, 2020	—		1,218		4,276
Beyond 2020	—		8,053		19,384
Total Estimated Amortization Expense	$	1,355	$	16,896	$	61,210

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NOTE 9: 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, 2015			December 31, 2014
	($ in Thousands)
Short-Term Funding
Federal funds purchased	$	58,700		$	109,770
Securities sold under agreements to repurchase	528,572			384,221
Federal funds purchased and securities sold under agreements to repurchase	$	587,272		$	493,991
FHLB advances	—			500,000
Commercial paper	75,265			74,297
Other short-term funding	75,265			574,297
Total short-term funding	$	662,537		$	1,068,288
Long-Term Funding
FHLB advances	$	2,500,251		$	3,000,260
Senior notes, at par	680,000			680,000
Subordinated notes, at par	250,000			250,000
Other long-term funding and capitalized costs	(326		)	(143		)
Total long-term funding	3,429,925			3,930,117
Total short and long-term funding	$	4,092,462		$	4,998,405

Short-term funding:

The securities sold under agreements to repurchase represent short-term funding which is collateralized by securities of the U.S. Government or its agencies. The FHLB advances included in short-term funding are those with original contractual maturities of one year or less. During the first quarter of 2015, the Corporation repaid $500 million of short-term FHLB advances.

Long-term funding:

FHLB Advances: Long-term FHLB advances had a weighted-average interest rate of 0.12% for March 31, 2015 compared to 0.11% at December 31, 2014. The FHLB advances are indexed to the FHLB discount note and reprice at varying intervals. The advances offer flexible, low cost, long-term funding that improves the Corporation’s liquidity profile. During the first quarter of 2015, the Corporation early redeemed $500 million of long-term FHLB advances.

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.

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 10: Income Taxes

The Corporation recognized income tax expense of $22 million for the first quarter of 2015, compared to income tax expense of $21 million for the comparable period in 2014. The effective tax rate was 32.49% for the first quarter of 2015, compared to an effective tax rate of 31.35% for the first quarter of 2014.

NOTE 11: Derivative and Hedging Activities

The Corporation facilitates customer borrowing activity by providing various interest rate risk management solutions through its capital markets area. To date, all of the notional amounts of customer transactions have been matched with a mirror swap with another counterparty. The Corporation has used, and may again use 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 sheet from changes in interest rates. The predominant derivative and hedging activities include interest rate-related instruments (swaps and caps),

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foreign currency exchange forwards, 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-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 $7 million of investment securities as collateral at March 31, 2015, and pledged $11 million of investment securities as collateral at December 31, 2014. Under the Dodd-Frank Wall Street Reform and Consumer Protection Act, as of June 10, 2013, the Corporation must 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, 2015, the Corporation posted cash collateral for the margin of $23 million, compared to $15 million at December 31, 2014.

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 14 for additional fair value information and disclosures.

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

							Weighted Average
($ in Thousands)	Notional Amount		Fair Value			Balance Sheet Category	Receive Rate(1)	Pay Rate(1)	Maturity
March 31, 2015
Interest rate-related instruments — customer and mirror	$	1,655,749	$	38,990		Trading assets	1.50%	1.50%	41 months
Interest rate-related instruments — customer and mirror	1,655,749		(41,633		)	Trading liabilities	1.50%	1.50%	41 months
Interest rate lock commitments (mortgage)	207,110		3,685			Other assets	--	--	--
Forward commitments (mortgage)	309,275		(1,795		)	Other liabilities	--	--	--
Foreign currency exchange forwards	88,834		3,346			Trading assets	--	--	--
Foreign currency exchange forwards	79,934		(3,097		)	Trading liabilities	--	--	--
Purchased options (time deposit)	109,510		6,111			Other assets	--	--	--
Written options (time deposit)	109,510		(6,111		)	Other liabilities	--	--	--
December 31, 2014
Interest rate-related instruments — customer and mirror	$	1,636,480	$	33,023		Trading assets	1.60%	1.60%	42 months
Interest rate-related instruments — customer and mirror	1,636,480		(35,372		)	Trading liabilities	1.60%	1.60%	42 months
Interest rate lock commitments (mortgage)	126,379		1,947			Other assets	--	--	--
Forward commitments (mortgage)	234,500		(2,435		)	Other liabilities	--	--	--
Foreign currency exchange forwards	60,742		2,140			Trading assets	--	--	--
Foreign currency exchange forwards	56,573		(1,957		)	Trading liabilities	--	--	--
Purchased options (time deposit)	110,347		6,054			Other assets	--	--	--
Written options (time deposit)	110,347		(6,054		)	Other liabilities	--	--	--

⁽¹⁾  Reflects the weighted average receive rate and pay rate for the interest rate swap derivative financial instruments only.

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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	Gain /(Loss) Recognized in Income
		($ in Thousands)
Three Months Ended March 31, 2015
Interest rate-related instruments — customer and mirror, net	Capital market fees, net	$	(294	)
Interest rate lock commitments (mortgage)	Mortgage banking, net	1,738
Forward commitments (mortgage)	Mortgage banking, net	640
Foreign currency exchange forwards	Capital market fees, net	66
Three Months Ended March 31, 2014
Interest rate-related instruments — customer and mirror, net	Capital market fees, net	$	70
Interest rate lock commitments (mortgage)	Mortgage banking, net	375
Forward commitments (mortgage)	Mortgage banking, net	(789		)
Foreign currency exchange forwards	Capital market fees, net	44

Free standing derivatives

The Corporation enters into various derivative contracts which are designated as free standing derivative contracts. 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 sheet 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).

Free standing derivative products are entered into primarily for the benefit of commercial customers seeking to manage their exposures to interest rate risk. 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.

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.

Foreign currency derivatives

The Corporation provides foreign exchange services to customers, primarily forward contracts. Our customers enter into a foreign currency 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 exchange derivative contract. Such foreign exchange contracts are carried at fair value on the consolidated balance sheet with changes in fair value recorded as a component of Capital market fees, net.

Written and purchased option derivatives (time deposit)

The Corporation has periodically entered into written and purchased option derivative instruments to facilitate an equity linked time deposit product (the “Power CD”). During September 2013, the Corporation terminated the Power CD product. 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.

NOTE 12: Balance Sheet Offsetting

Interest Rate-Related Instruments (“Interest Agreements”)

The Corporation enters into interest rate-related instruments to facilitate the interest rate risk management strategies of commercial customers. The Corporation mitigates this risk by entering into equal and offsetting interest rate-related instruments with highly rated third party financial institutions. The interest agreements are free-standing derivatives and are recorded at fair value in the Corporation’s consolidated balance sheet. The Corporation is party to master netting arrangements with its financial institution counterparties; however, the Corporation does not offset assets and liabilities under these arrangements for financial statement presentation purposes. The master netting arrangements provide for a single net settlement of all interest agreements, as well as collateral, in the event of default on, or termination of, any one contract. Collateral, usually in the form of investment securities

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and cash, is posted by the counterparty with net liability positions in accordance with contract thresholds. See Note 11 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. 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. As a result, these repurchase agreements are accounted for as collateralized financing arrangements (i.e., secured borrowings) and not as a sale and subsequent repurchase of securities. The obligation to repurchase the securities is reflected as a liability in the Corporation’s consolidated balance sheet, 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). The right of setoff 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.

The following table presents the assets and liabilities subject to an enforceable master netting arrangement as of March 31, 2015 and December 31, 2014. The swap 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 offset in the balance sheet		Net amounts presented in the balance sheet		Gross amounts not offset
							in the balance sheet
							Financial instruments			Collateral			Net amount
March 31, 2015	($ in Thousands)
Derivative assets:
Interest rate-related instruments	$	143	$	—	$	143	$	(143	)	$	—		$	—
Derivative liabilities:
Interest rate-related instruments	$	40,348	$	—	$	40,348	$	(143	)	$	(30,481	)	$	9,724
December 31, 2014
Derivative assets:
Interest rate-related instruments	$	558	$	—	$	558	$	(558	)	$	—		$	—
Derivative liabilities:
Interest rate-related instruments	$	34,087	$	—	$	34,087	$	(558	)	$	(26,105	)	$	7,424

NOTE 13: Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities

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) and derivative instruments (see Note 11). The following is a summary of lending-related commitments.

	March 31, 2015		December 31, 2014
	($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(1)(2)	$	6,362,769	$	6,884,411
Commercial letters of credit (1)	11,938		9,179
Standby letters of credit (3)	333,716		353,292

⁽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, 2015 or December 31, 2014.

⁽²⁾  Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 11.

⁽³⁾  The Corporation has established a liability of $3 million at March 31, 2015 compared to $4 million at December 31, 2014, as an estimate of the fair value of these financial instruments.

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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 $25 million at both March 31, 2015 and December 31, 2014, and is included in accrued expenses and other liabilities on the consolidated balance sheets. See Note 7 for additional information on the allowance for unfunded commitments.

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 11. 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 low-income housing, small-business commercial real estate, new market tax credit projects, and historic tax credit projects to promote the revitalization of 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, 2015 was $41 million, compared to $27 million at December 31, 2014, included in other assets on the consolidated balance sheets. Related to these investments, the Corporation had remaining commitments to fund of $28 million at both March 31, 2015 and December 31, 2014.

Contingent Liabilities

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 current 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.

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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 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.

The U.S. Department of Housing and Urban Development (“HUD”) is investigating the Bank’s compliance with fair housing laws, particularly from the period 2008 to 2011. There are several possible outcomes from this matter, including administrative or court proceedings, or a conciliation agreement with HUD. The Corporation believes it has been in compliance in all material respects with all applicable laws and regulations related to fair housing. 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 investigation by HUD.

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.

Debt protection and identity protection products have recently received increased regulatory scrutiny, and it is possible that regulatory authorities could bring enforcement actions, including civil money penalties, or take other actions against the Corporation in regard to these legacy 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 this matter.

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 $800,000 and $5 million during the three months ended March 31, 2015 and the year ended December 31, 2014, respectively, and paid loss reimbursement or settlement claims of approximately $6,000 and $734,000 during the three months ended March 31, 2015 and the year ended December 31, 2014, respectively. The Corporation had a mortgage repurchase reserve for potential claims on loans previously sold of $2 million at March 31, 2015, compared to $3 million at December 31, 2014. Make whole requests during 2014 and the first three months of 2015 generally arose from loans sold during the period January 1, 2006 to December 31, 2014, which totaled $18.9 billion at the time of sale, and consisted primarily of loans sold to GSEs. As of March 31, 2015, approximately $7.5 billion of these sold loans remain outstanding.

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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, 2015			For The Year Ended December 31, 2014
	($ in Thousands)
Balance at beginning of period	$	3,258		$	5,737
Repurchase provision expense	128			505
Adjustments to provision expense	(950		)	(2,250		)
(Charge offs) recoveries	45			(734		)
Balance at end of period	$	2,481		$	3,258

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, 2015 and December 31, 2014, there were approximately $52 million and $46 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, 2015 and December 31, 2014, there were $167 million and $178 million, respectively, of such residential mortgage loans with credit risk recourse, upon which there have been negligible historical losses to the Corporation.

NOTE 14: 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. Level 1 investment securities primarily include U.S. Treasury and exchange-traded debt and equity securities. 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. Examples of these investment securities include obligations of state and political subdivisions (municipal securities), mortgage-related securities and other debt securities. 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 again use 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 11 for additional disclosure regarding the Corporation’s derivative financial instruments.

The discounted cash flow analysis component in the fair value measurement 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

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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. In conjunction with the FASB’s fair value measurement guidance, the Corporation made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.

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 creditspreads 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, 2015, and December 31, 2014, 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 11 for additional disclosures regarding the Corporation’s foreign currency exchange forwards.

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 11 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.

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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, 2015 and December 31, 2014, 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 Measurements Using
	March 31, 2015		Level 1		Level 2		Level 3
	($ in Thousands)
Assets:
Investment securities available for sale:
U.S. Treasury securities	$	1,002	$	1,002	$	—	$	—
Obligations of state and political subdivisions (municipal securities)	524,587		—		524,587		—
Residential mortgage-related securities:
Government-sponsored enterprise (GSE)	3,675,114		—		3,675,114		—
Private-label	1,953		—		1,953		—
GSE commercial mortgage-related securities	1,149,256		—		1,149,256		—
Other securities (debt and equity)	6,398		3,198		3,000		200
Total investment securities available for sale	$	5,358,310	$	4,200	$	5,353,910	$	200
Derivatives (trading and other assets)	$	52,132	$	—	$	48,447	$	3,685
Liabilities:
Derivatives (trading and other liabilities)	$	52,636	$	—	$	50,841	$	1,795
			Fair Value Measurements Using
	December 31, 2014		Level 1		Level 2		Level 3
	($ in Thousands)
Assets:
Investment securities available for sale:
U.S. Treasury securities	$	998	$	998	$	—	$	—
Obligations of state and political subdivisions (municipal securities)	582,679		—		582,679		—
Residential mortgage-related securities:
GSE	3,730,789		—		3,730,789		—
Private-label	2,294		—		2,294		—
GSE commercial mortgage-related securities	1,073,893		—		1,073,893		—
Other securities (debt and equity)	6,159		2,959		3,000		200
Total investment securities available for sale	$	5,396,812	$	3,957	$	5,392,655	$	200
Derivatives (trading and other assets)	$	43,164	$	—	$	41,217	$	1,947
Liabilities:
Derivatives (trading and other liabilities)	$	45,818	$	—	$	43,383	$	2,435

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The table below presents a rollforward of the balance sheet amounts for the year ended December 31, 2014 and the three months ended March 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, 2013	$	299		$	1,717
Total net losses included in income:
Mortgage derivative loss	—			(2,205		)
Sales of investment securities	(99		)	—
Balance December 31, 2014	$	200		$	(488	)
Total net gains included in income:
Mortgage derivative gain	—			2,378
Balance March 31, 2015	$	200		$	1,890

For Level 3 assets and liabilities measured at fair value on a recurring or nonrecurring basis as of March 31, 2015, 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 (“IRLC”) 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 Mortgage Risk Management Committee. At March 31, 2015, the closing ratio was 86%.

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 average discounts of 20% to 30%.

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 15.0% and 9.6% at March 31, 2015, 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.

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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, 2015 and December 31, 2014, 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
			Fair Value Measurements Using
	March 31, 2015		Level 1		Level 2		Level 3
	($ in Thousands)
Assets:
Loans held for sale	$	161,662	$	—	$	161,662	$	—
Impaired loans (1)	93,580		—		—		93,580
Mortgage servicing rights	64,026		—		—		64,026
			Fair Value Measurements Using
	December 31, 2014		Level 1		Level 2		Level 3
	($ in Thousands)
Assets:
Loans held for sale	$	156,423	$	—	$	156,423	$	—
Impaired loans (1)	83,956		—		—		83,956
Mortgage servicing rights	66,342		—		—		66,342

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

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 2015 and the full year 2014, 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 $2 million for the first three months of 2015 and $21 million for the year ended December 31, 2014. 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 one million and $2 million to asset losses, net for the three months ended March 31, 2015 and the year ended December 31, 2014, 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, 2015
	Carrying Amount		Fair Value		Fair Value Measurements Using
					Level 1		Level 2		Level 3
	($ in Thousands)
Financial assets:
Cash and due from banks	$	355,541	$	355,541	$	355,541	$	—	$	—
Interest-bearing deposits in other financial institutions	488,426		488,426		488,426		—		—
Federal funds sold and securities purchased under agreements to resell	3,380		3,380		3,380		—		—
Investment securities held to maturity	438,047		446,697		—		446,697		—
Investment securities available for sale	5,358,310		5,358,310		4,200		5,353,910		200
FHLB and Federal Reserve Bank stocks	189,222		189,222		—		189,222		—
Loans held for sale	159,963		161,662		—		161,662		—
Loans, net	17,713,764		17,921,155		—		—		17,921,155
Bank owned life insurance	576,707		576,707		—		576,707		—
Accrued interest receivable	69,759		69,759		69,759		—		—
Interest rate-related instruments	38,990		38,990		—		38,990		—
Foreign currency exchange forwards	3,346		3,346		—		3,346		—
Interest rate lock commitments to originate residential mortgage loans held for sale	3,685		3,685		—		—		3,685
Purchased options (time deposit)	6,111		6,111		—		6,111		—
Financial liabilities:
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits	$	18,215,591	$	18,215,591	$	—	$	—	$	18,215,591
Brokered CDs and other time deposits	1,636,001		1,639,738		—		1,639,738		—
Short-term funding	662,537		662,537		—		662,537		—
Long-term funding	3,429,925		3,487,809		—		3,487,809		—
Accrued interest payable	8,582		8,582		8,582		—		—
Interest rate-related instruments	41,633		41,633		—		41,633		—
Foreign currency exchange forwards	3,097		3,097		—		3,097		—
Standby letters of credit (1)	3,373		3,373		—		3,373		—
Forward commitments to sell residential mortgage loans	1,795		1,795		—		—		1,795
Written options (time deposit)	6,111		6,111		—		6,111		—

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	December 31, 2014
	Carrying Amount		Fair Value		Fair Value Measurements Using
					Level 1		Level 2		Level 3
	($ in Thousands)
Financial assets:
Cash and due from banks	$	444,113	$	444,113	$	444,113	$	—	$	—
Interest-bearing deposits in other financial institutions	571,924		571,924		571,924		—		—
Federal funds sold and securities purchased under agreements to resell	16,030		16,030		16,030		—		—
Investment securities held to maturity	404,455		413,067		—		413,067		—
Investment securities available for sale	5,396,812		5,396,812		3,957		5,392,655		200
FHLB and Federal Reserve Bank stocks	189,107		189,107		—		189,107		—
Loans held for sale	154,935		156,423		—		156,423		—
Loans, net	17,327,544		17,427,647		—		—		17,427,647
Bank owned life insurance	574,154		574,154		—		574,154		—
Accrued interest receivable	67,573		67,573		67,573		—		—
Interest rate-related instruments	33,023		33,023		—		33,023		—
Foreign currency exchange forwards	2,140		2,140		—		2,140		—
Interest rate lock commitments to originate residential mortgage loans held for sale	1,947		1,947		—		—		1,947
Purchased options (time deposit)	6,054		6,054		—		6,054		—
Financial liabilities:
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits	$	17,192,049	$	17,192,049	$	—	$	—	$	17,192,049
Brokered CDs and other time deposits	1,571,455		1,571,455		—		1,571,455		—
Short-term funding	1,068,288		1,068,288		—		1,068,288		—
Long-term funding	3,930,117		3,975,605		—		3,975,605		—
Accrued interest payable	9,530		9,530		9,530		—		—
Interest rate-related instruments	35,372		35,372		—		35,372		—
Foreign currency exchange forwards	1,957		1,957		—		1,957		—
Standby letters of credit (1)	3,542		3,542		—		3,542		—
Forward commitments to sell residential mortgage loans	2,435		2,435		—		—		2,435
Written options (time deposit)	6,054		6,054		—		6,054		—

(1) The commitment on standby letters of credit was $334 million and $353 million at March 31, 2015 and December 31, 2014, respectively. See Note 13 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, federal funds sold and securities purchased under agreements to resell, and accrued interest receivable – 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), lease financing, residential mortgage, home equity, other installment, and credit cards.

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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 deposits, savings, interest-bearing demand deposits, and money market deposits, 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.

Accrued interest payable and short-term funding – For these short-term instruments, the carrying amount is a reasonable estimate of fair value.

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.

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.

Standby letters of credit – The fair value of standby letters of credit represent 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.

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.

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

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.

NOTE 15: 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. In connection with the First Federal acquisition

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in October 2004, the Corporation assumed the First Federal pension plan (the “First Federal Plan”). The First Federal Plan was frozen on December 31, 2004 and qualified participants in the First Federal Plan became eligible to participate in the RAP as of January 1, 2005. Additional discussion and information on the RAP and the First Federal Plan are collectively referred to below as the “Pension Plan”.

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 Pension and Postretirement Plans for the three months ended March 31, 2015 and 2014, respectively, and for the full year 2014 were as follows.

	Three Months Ended March 31,						Year Ended December 31,
	2015			2014			2014
	($ in Thousands)
Components of Net Periodic Benefit Cost
Pension Plan:
Service cost	$	3,063		$	2,975		$	11,058
Interest cost	1,642			1,790			7,132
Expected return on plan assets	(5,350		)	(4,855		)	(19,922		)
Amortization of prior service cost	13			15			58
Amortization of actuarial loss	532			325			1,384
Total net periodic benefit cost	$	(100	)	$	250		$	(290	)
Postretirement Plan:
Interest cost	$	35		$	39		$	150
Amortization of actuarial gain	—			(9		)	(35		)
Total net periodic benefit cost	$	35		$	30		$	115

The Corporation’s funding policy is to pay at least the minimum amount required by the funding requirements of federal law and regulations, with consideration given to the maximum funding amounts allowed. The Corporation regularly reviews the funding of its Pension Plan.

NOTE 16: 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, with no segment representing more than half of the assets of the Corporation as a whole.

The financial information of the Corporation’s segments has been compiled utilizing the accounting policies described in the Corporation's 2014 annual report on Form 10-K with certain exceptions. The more significant of these exceptions are described herein. The Corporation allocates interest income or interest expense using a funds transfer pricing methodology that charges users of funds (assets) interest expense and credits providers of funds (liabilities, primarily deposits) with income 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. 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 using the methodologies described in the Corporation's 2014 annual report on Form 10-K to assess the overall appropriateness of the allowance for credit 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

42

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. During 2015, certain organizational and methodology changes were made and, accordingly, 2014 results have been restated and presented on a comparable basis.

A description of each business segment is presented below.

Corporate and Commercial Specialty — The Corporate and Commercial Specialty segment serves a wide range of customers including larger businesses, developers, non-profits, municipalities, and financial institutions. In serving this segment we compete based on an in-depth understanding of our customers’ financial needs, the ability to match market competitive solutions to those needs, and the highest standards of relationship and service excellence in the delivery of these services. Delivery of services is provided through our corporate and commercial units, our commercial real estate unit, as well as our specialized industries and commercial financial services units. Within this segment we provide the following products and services: (1) lending solutions, such as commercial loans and lines of credit, commercial real estate financing, construction loans, letters of credit, leasing, and asset based lending; for our larger clients we also provide loan syndications; (2) deposit and cash management solutions such as commercial checking and interest-bearing deposit products, cash vault and night depository services, liquidity solutions, payables and receivables solutions; and information services; and (3) specialized financial services such as swaps, capital markets, foreign exchange, and international banking solutions.

Community, Consumer, and Business — The Community, Consumer, and Business segment serves individuals, as well as small and mid-size businesses. In serving this segment we compete based on providing a broad range of solutions to meet the needs of our customers in their entire financial lifecycle, convenient access to our services through multiple channels such as branches, phone based services, online and mobile banking, and a relationship based business model which assists our customers in navigating any changes and challenges in their financial circumstances. Delivery of services is provided through our various Consumer Banking, Community Banking, and Private Client units. Within this segment we provide the following products and services: (1) lending solutions such as residential mortgages, home equity loans and lines of credit, personal and installment loans, real estate financing, business loans, and business lines of credit; (2) deposit and transactional solutions such as checking, credit, debit and pre-paid cards, online banking and bill pay, and money transfer services; (3) investable funds solutions such as savings, money market deposit accounts, IRA accounts, certificates of deposit, fixed and variable annuities, full-service, discount and on-line investment brokerage; trust and investment management accounts; (4) insurance, benefits related products and services; and (5) fiduciary services such as administration of pension, profit-sharing and other employee benefit plans, fiduciary and corporate agency services, and institutional asset management.

Risk Management and Shared Services — The Risk Management and Shared Services segment includes Corporate Risk Management, Credit Administration, Finance, Treasury, Operations and Technology, which are key shared functions. The segment also includes Parent Company activity, intersegment eliminations and residual revenue and expenses, representing the difference between actual amounts incurred and the amounts allocated to operating segments, including interest rate risk residuals (funds transfer pricing mismatches) and credit risk and provision residuals (long term credit charge mismatches). The earning assets within this segment include the Corporation’s investment portfolio and capital includes both allocated as well as any remaining unallocated capital.

43

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, 2015
Net interest income	$	75,691		$	86,357		$	5,765		$	167,813
Noninterest income	12,613			65,514			1,949			80,076
Total revenue	88,304			151,871			7,714			247,889
Credit provision *	9,526			7,071			(12,097		)	4,500
Noninterest expense	34,460			118,543			21,252			174,255
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 (ROT1CE) **	12.5		%	10.7		%	(1.1		)%	10.2		%
Three Months Ended March 31, 2014
Net interest income	$	74,065		$	72,251		$	18,657		$	164,973
Noninterest income	11,854			55,829			5,838			73,521
Total revenue	85,919			128,080			24,495			238,494
Credit provision *	13,032			4,948			(12,980		)	5,000
Noninterest expense	35,721			111,199			20,738			167,658
Income before income taxes	37,166			11,933			16,737			65,836
Income tax expense	13,008			4,176			3,453			20,637
Net income	$	24,158		$	7,757		$	13,284		$	45,199
Return on average allocated capital (ROT1CE) **	11.0		%	5.9		%	10.2		%	9.4		%
Segment Balance Sheet Data
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business			Risk Management and Shared Services			Consolidated Total
Average Balances for 1Q 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 (T1CE) **	$	942,764		$	647,375		$	214,078		$	1,804,217
Average Balances for 1Q 2014
Average earning assets	$	8,850,984		$	7,230,394		$	5,811,125		$	21,892,503
Average loans	8,843,070			7,230,394			91,153			16,164,617
Average deposits	5,241,027			9,539,887			2,209,358			16,990,272
Average allocated capital (T1CE) **	$	886,927		$	535,752		$	476,856		$	1,899,535

* 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 Tier 1 common equity 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 ROT1CE reflects return on average allocated Tier 1 common equity ("T1CE"). The ROT1CE 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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Note 17: Accumulated Other Comprehensive Income (Loss)

The following table summarizes the components of accumulated other comprehensive income (loss) at March 31, 2015 and 2014, changes during the three month periods then ended, and reclassifications out of accumulated other comprehensive income during the three month periods ended March 31, 2015 and 2014, respectively. The amounts reclassified from accumulated other comprehensive income for the investment securities available for sale are included in investment securities gains, net on the consolidated statements of income, while the amounts reclassified from accumulated other comprehensive income for the defined benefit pension and post retirement obligations are a component of personnel expense on the consolidated statements of income.

($ in Thousands)	Investments Securities Available For Sale			Defined Benefit Pension and Post Retirement Obligations			Accumulated Other Comprehensive Income (Loss)
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	—			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
Balance January 1, 2014	$	(11,396	)	$	(12,848	)	$	(24,244	)
Other comprehensive income before reclassifications	20,627			—			20,627
Amounts reclassified from accumulated other comprehensive income (loss)	(378		)	331			(47		)
Income tax expense	(7,786		)	(127		)	(7,913		)
Net other comprehensive income during period	12,463			204			12,667
Balance March 31, 2014	$	1,067		$	(12,644	)	$	(11,577	)

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, 2014, 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.

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Performance Summary

• Average loans grew $1.7 billion (10%) from the first quarter of 2014, with commercial loans accounting for the majority of the loan growth. Average deposits grew $2.1 billion (12%) from the first quarter of 2014, primarily in money market and interest-bearing demand accounts. For the remainder of 2015, the Corporation expects high single digit annual average loan growth and to maintain the loan / deposit ratio under 100%.

• Credit quality was steady with minimal changes in charge offs, nonaccrual loans, and potential problem loans compared to the first quarter of 2014. For the remainder of 2015, the Corporation anticipates the provision for loan losses will grow based on expected loan growth, changes in risk grade, and other indicators of credit quality.

• Net interest income of $168 million increased $3 million (2%) from the comparable quarter in 2014, while the net interest margin declined to 2.89%. For the remainder of 2015, the Corporation expects modest compression on the net interest margin throughout the rest of the year.

• Noninterest income of $80 million increased $7 million (9%) from the first quarter of 2014, primarily in insurance commissions. For the remainder of 2015, the Corporation expects mid to upper single digit growth from 2014.

• Noninterest expense of $174 million increased $7 million (4%) from the first quarter of 2014. For the remainder of 2015, the Corporation expects noninterest expense will increase in the low single digits from 2014 with a continued focus on efficiency initiatives.

TABLE 1

Summary Results of Operations: Trends

($ in Thousands, except per share data)

	1st Qtr 2015			4th Qtr 2014			3rd Qtr 2014			2nd Qtr 2014			1st Qtr 2014
Net income (Quarter)	$	46,672		$	48,738		$	50,207		$	46,365		$	45,199
Net income (Year-to-date)	46,672			190,509			141,771			91,564			45,199
Net income available to common equity (Quarter)	$	45,444		$	47,513		$	48,952		$	45,087		$	43,955
Net income available to common equity (Year-to-date)	45,444			185,507			137,994			89,042			43,955
Earnings per common share – basic (Quarter)	$	0.30		$	0.31		$	0.31		$	0.28		$	0.27
Earnings per common share – basic (Year-to-date)	0.30			1.17			0.86			0.55			0.27
Earnings per common share – diluted (Quarter)	$	0.30		$	0.31		$	0.31		$	0.28		$	0.27
Earnings per common share – diluted (Year-to-date)	0.30			1.16			0.85			0.55			0.27
Return on average assets (Quarter)	0.71		%	0.75		%	0.78		%	0.75		%	0.76		%
Return on average assets (Year-to-date)	0.71			0.76			0.76			0.75			0.76
Return on average equity (Quarter)	6.65		%	6.83		%	6.93		%	6.43		%	6.35		%
Return on average equity (Year-to-date)	6.65			6.63			6.57			6.39			6.35
Return on average tangible common equity (Quarter)	10.16		%	10.27		%	10.35		%	9.56		%	9.45		%
Return on average tangible common equity (Year-to-date)	10.16			9.91			9.79			9.51			9.45
Return on average Tier 1 common equity (Quarter) (1)	10.22		%	10.35		%	10.38		%	9.56		%	9.38		%
Return on average Tier 1 common equity (Year-to-date) (1)	10.22			9.92			9.78			9.47			9.38
Efficiency ratio (Quarter) (2)	70.30		%	70.33		%	69.44		%	69.70		%	70.41		%
Efficiency ratio (Year-to-date)(2)	70.30			69.97			69.85			70.05			70.41
Efficiency ratio, fully taxable equivalent (Quarter)(2)	68.86		%	69.66		%	69.04		%	68.23		%	68.86		%
Efficiency ratio, fully taxable equivalent (Year-to-date) (2)	68.86			68.95			68.71			68.54			68.86
Net interest margin (Quarter)	2.89		%	3.04		%	3.06		%	3.08		%	3.12		%
Net interest margin (Year-to-date)	2.89			3.08			3.09			3.10			3.12

(1) Return on average Tier 1 common equity = Net income available to common equity divided by average Tier 1 capital excluding qualifying perpetual preferred stock and qualifying trust preferred securities. This is a non-GAAP financial measure.

(2) See Table 1A for a reconciliation of this non-GAAP measure.

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TABLE 1A

Reconciliation of Non-GAAP Measure

	1st Qtr 2015		4th Qtr 2014		3rd Qtr 2014		2nd Qtr 2014		1st Qtr 2014
Efficiency ratio (Quarter) (a)	70.30	%	70.33	%	69.44	%	69.70	%	70.41	%
Taxable equivalent adjustment (Quarter)	(1.42	)%	(1.40	)%	(1.36	)%	(1.32	)%	(1.35	)%
Asset gains, net (Quarter)	0.30	%	1.05	%	1.36	%	0.26	%	0.22	%
Other intangible amortization (Quarter)	(0.32	)%	(0.32	)%	(0.40	)%	(0.41	)%	(0.42	)%
Efficiency ratio, fully taxable equivalent (Quarter) (b)	68.86	%	69.66	%	69.04	%	68.23	%	68.86	%
Efficiency ratio (Year-to-date) (a)	70.30	%	69.97	%	69.85	%	70.05	%	70.41	%
Taxable equivalent adjustment (Year-to-date)	(1.42	)%	(1.36	)%	(1.34	)%	(1.34	)%	(1.35	)%
Asset gains, net (Year-to-date)	0.30	%	0.73	%	0.61	%	0.24	%	0.22	%
Other intangible amortization (Year-to-date)	(0.32	)%	(0.39	)%	(0.41	)%	(0.41	)%	(0.42	)%
Efficiency ratio, fully taxable equivalent (Year-to-date) (b)	68.86	%	68.95	%	68.71	%	68.54	%	68.86	%

(a) Efficiency ratio is defined by the Federal Reserve guidance as noninterest expense divided by the sum of net interest income plus noninterest income, excluding investment securities gains / losses, net.

(b) Efficiency ratio, fully taxable equivalent, is noninterest expense, excluding other intangible amortization, divided by the sum of taxable equivalent net interest income plus noninterest income, excluding investment securities gains / losses, net and asset gains / losses, net. This efficiency ratio is presented on a taxable equivalent basis, which adjusts net interest income for the tax-favored status of certain loans and investment securities. Management believes this measure to be the preferred industry measurement of net interest income as it enhances the comparability of net interest income arising from taxable and tax-exempt sources and it excludes certain specific revenue items (such as investment securities gains / losses, net and asset gains / losses, net).

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Net Interest Income and Net Interest Margin

TABLE 2

Net Interest Income Analysis

($ in Thousands)

	Three months ended March 31, 2015						Three months ended March 31, 2014
	Average Balance		Interest Income/ Expense		Average Yield/ Rate		Average Balance		Interest Income/ Expense		Average Yield/ Rate
Earning assets:
Loans: (1)(2)(3)
Commercial and business lending	$	6,993,169	$	55,915	3.24	%	$	6,131,185	$	51,681	3.42	%
Commercial real estate lending	4,102,733		36,403		3.60	%	3,907,363		35,591		3.69	%
Total commercial	11,095,902		92,318		3.37	%	10,038,548		87,272		3.52	%
Residential mortgage	4,663,849		36,885		3.17	%	3,926,734		32,664		3.33	%
Retail	2,055,364		23,668		4.64	%	2,199,335		24,413		4.48	%
Total loans	17,815,115		152,871		3.46	%	16,164,617		144,349		3.61	%
Investment securities(1)	5,754,747		37,159		2.58	%	5,450,066		36,922		2.71	%
Other short-term investments	578,164		1,692		1.18	%	277,820		1,449		2.09	%
Investments and other	6,332,911		38,851		2.45	%	5,727,886		38,371		2.68	%
Total earning assets	24,148,026		$	191,722	3.20	%	21,892,503		$	182,720	3.36	%
Other assets, net	2,458,899						2,320,710
Total assets	$	26,606,925					$	24,213,213
Interest-bearing liabilities:
Interest-bearing deposits:
Savings deposits	$	1,277,469	$	238	0.08	%	$	1,195,337	$	220	0.07	%
Interest-bearing demand deposits	3,203,727		1,050		0.13	%	2,796,247		823		0.12	%
Money market deposits	8,653,260		3,785		0.18	%	7,173,106		2,825		0.16	%
Time deposits	1,594,183		2,546		0.65	%	1,659,277		2,291		0.56	%
Total interest-bearing deposits	14,728,639		7,619		0.21	%	12,823,967		6,159		0.19	%
Federal funds purchased and securities sold under agreements to repurchase	585,498		231		0.16	%	805,187		305		0.15	%
Other short-term funding	119,240		81		0.27	%	328,516		116		0.14	%
Long-term funding	3,735,602		10,872		1.17	%	3,004,520		6,511		0.87	%
Total short and long-term funding	4,440,340		11,184		1.01	%	4,138,223		6,932		0.67	%
Total interest-bearing liabilities	19,168,979		$	18,803	0.39	%	16,962,190		$	13,091	0.31	%
Noninterest-bearing demand deposits	4,326,557						4,166,305
Other liabilities	266,660						195,950
Stockholders’ equity	2,844,729						2,888,768
Total liabilities and equity	$	26,606,925					$	24,213,213
Interest rate spread					2.81	%					3.05	%
Net free funds					0.08	%					0.07	%
Net interest income, taxable equivalent, and net interest margin			$	172,919	2.89	%			$	169,629	3.12	%
Taxable equivalent adjustment			$	5,106					$	4,656
Net interest income			$	167,813					$	164,973

⁽¹⁾  The yield on tax exempt loans and securities is computed on a taxable 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.

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Notable contributions to the change in net interest income were:

• Net interest income on a taxable equivalent basis for the quarter ended March 31, 2015, was $173 million, an increase of $3 million (2%) versus the first quarter of 2014. The increase in taxable equivalent net interest income was attributable to favorable volume variance (as balance sheet changes in both volume and mix increased taxable equivalent net interest income by $15 million), partially offset by unfavorable rate variances (as the impact of changes in the interest rate environment and product pricing decreased taxable equivalent net interest income by $12 million).

• The net interest margin for the first quarter of 2015 was 2.89%, 23 bp lower than 3.12% for the same period in 2014. This comparable period decrease was comprised of a 24 bp decrease in interest rate spread (the net of a 16 bp decrease in yield on earning assets and an 8 bp increase in the cost of interest-bearing liabilities) and a 1 bp higher contribution from net free funds.

• The Federal Reserve left interest rates unchanged during 2014 and the first quarter of 2015. The Federal Reserve has affirmed that it is unlikely that the short-term interest rates will increase until later in 2015.

• The yield on earning assets was 3.20% for the first quarter of 2015, 16 bp lower than the comparable period last year. Loan yields were down 15 bp, (to 3.46%), due to the repricing of adjustable rate loans and competitive pricing pressures in a low interest rate environment. The yield on investment securities and other short-term investments decreased 23 bp (to 2.45%), and was also impacted by the low interest rate environment and higher prepayment speeds of mortgage-related securities purchased at a premium.

• The rate on interest-bearing liabilities of 0.39% for the first quarter of 2015 was 8 bp higher than the same period in 2014. The cost of short and long-term funding increased 34 bp (to 1.01%). The cost of short-term funding was relatively flat, while the cost of long-term funding increased 30 bp (to 1.17%), mainly due to the issuance of long-term senior and subordinated notes in late 2014.

• Average earning assets were $24.1 billion for the first quarter of 2015, an increase of $2.3 billion (10%) from the comparable period last year. Average loans increased $1.7 billion, including increases in commercial loans (up $1.1 billion) and residential mortgage loans (up $737 million), while retail loans decreased (down $144 million). Average investment securities and other short-term investments increased $605 million, primarily in mortgage-related securities and interest-bearing deposits in other banks.

• Average interest-bearing liabilities of $19.2 billion for the first quarter of 2015 increased $2.2 billion (13%) from the comparable period last year. Average interest-bearing deposits increased $1.9 billion (primarily in money market deposits), while noninterest bearing deposits increased $160 million. On average, short and long-term funding increased $302 million between the comparable quarterly periods, including a $731 million increase in long-term funding (also mainly due to the issuance of long-term senior and subordinated notes in late 2014), partially offset by a $429 million decrease in short-term funding.

Provision for Credit Losses

The provision for credit losses (which includes the provision for loan losses and the provision for unfunded commitments) for both the first quarter of 2015 and 2014 was $5 million. The provision for credit losses was $16 million for the full year 2014. Net charge offs were $6 million for the first quarter of 2015, compared to $5 million for the first quarter of 2014 and $15 million for the full year of 2014. Annualized net charge offs as a percent of average loans for the first quarter of 2015 were 0.13%, compared to 0.14% for the first quarter of 2014 and 0.09% for the full year of 2014. See Tables 9 and 10.

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 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 “Credit Risk,” “Allowance for Credit Losses,” and “Nonaccrual Loans, Potential Problem Loans, and Other Real Estate Owned.”

49

Noninterest Income

TABLE 3

Noninterest Income

($ in Thousands)

	1st Qtr 2015			1st Qtr 2014			Dollar Change			Percent Change
Trust service fees	$	12,087		$	11,711		$	376		3.2	%
Service charges on deposit accounts	15,806			16,400			(594		)	(3.6	)%
Card-based and other nondeposit fees	12,416			12,509			(93		)	(0.7	)%
Insurance commissions	19,728			12,317			7,411			60.2	%
Brokerage and annuity commissions	3,683			4,033			(350		)	(8.7	)%
Core fee-based revenue	63,720			56,970			6,750			11.8	%
Mortgage banking income	10,830			8,930			1,900			21.3	%
Mortgage servicing rights expense	3,422			2,569			853			33.2	%
Mortgage banking, net	7,408			6,361			1,047			16.5	%
Capital market fees, net	2,467			2,322			145			6.2	%
Bank owned life insurance (“BOLI”) income	2,875			4,320			(1,445		)	(33.4	)%
Other	2,510			2,442			68			2.8	%
Subtotal ("fee income")	78,980			72,415			6,565			9.1	%
Asset gains, net	1,096			728			368			50.5	%
Investment securities gains, net	—			378			(378		)	(100.0	)%
Total noninterest income	$	80,076		$	73,521		$	6,555		8.9	%
Fee Income Ratio *	31		%	30		%
Mortgage loans originated for sale during period	$	268,296		$	203,764
Trust assets under management, at market value	$	8,137,705		$	7,535,066

* Fee income ratio is fee income, per the above table, divided by total revenue (defined as taxable equivalent net interest income plus fee income).

Notable contributions to the change in noninterest income were:

• Core fee-based revenue was $64 million, an increase of $7 million (12%) versus the first quarter of 2014. Insurance commissions were $20 million, up $7 million (60%) from the first quarter of 2014. The increase in insurance commissions was primarily due to the acquisition of Ahmann & Martin Co. See Note 2, "Acquisition," of the notes to consolidated financial statements for additional information on the Ahmann & Martin Co. acquisition.

• Net mortgage banking income was $7 million for the first quarter of 2015 and $6 million for the first quarter of 2014. 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 loan repurchase reserve, and the fair value adjustments on the mortgage derivatives. Gross mortgage banking income increased $2 million (21%) compared to the first quarter of 2014, due to a $3 million favorable change in the fair value of the mortgage derivatives, partially offset by lower gains on sales (down $1 million).

• Mortgage servicing rights expense includes both the amortization of the mortgage servicing rights asset and changes to the valuation allowance associated with the mortgage servicing rights asset. Mortgage servicing rights expense is affected by the size of the servicing portfolio, as well as the changes in the estimated fair value of the mortgage servicing rights asset. Mortgage servicing rights expense was $1 million higher than the comparable quarter in 2014. Mortgage servicing rights are considered a critical accounting policy given that estimating their fair value involves a discounted cash flow model and assumptions that involve judgment, particularly of estimated prepayment speeds of the underlying mortgages serviced and the overall level of interest rates. See section “Critical Accounting Policies,” as well as Note 8 “Goodwill and Other Intangible Assets,” and Note 14, “Fair Value Measurements,” of the notes to consolidated financial statements for additional disclosure.

50

• Bank owned life insurance income was $3 million, down $1 million from the first quarter of 2014 primarily due to death benefits received during the first quarter of 2014. All remaining noninterest income categories on a combined basis decreased less than $1 million (3%) compared to 2014.

Noninterest Expense

TABLE 4

Noninterest Expense

($ in Thousands)

	1st Qtr 2015		1st Qtr 2014		Dollar Change			Percent Change
Personnel expense	$	100,152	$	97,698	$	2,454		2.5	%
Occupancy	17,683		15,560		2,123			13.6	%
Equipment	5,772		6,276		(504		)	(8.0	)%
Technology	15,558		12,724		2,834			22.3	%
Business development and advertising	5,327		5,062		265			5.2	%
Other intangible amortization	801		991		(190		)	(19.2	)%
Loan expense	2,996		2,787		209			7.5	%
Legal and professional fees	4,538		4,188		350			8.4	%
Foreclosure / OREO expense	1,425		1,896		(471		)	(24.8	)%
FDIC expense	6,500		5,001		1,499			30.0	%
Other	13,503		15,475		(1,972		)	(12.7	)%
Total noninterest expense	$	174,255	$	167,658	$	6,597		3.9	%
Average full-time equivalent employees	4,422		4,517

Notable contributions to the change in noninterest expense were:

• Personnel expense (which includes salary-related expenses and fringe benefit expenses) was $100 million for the first quarter of 2015, up $2 million (3%) from the first quarter of 2014. Salary-related expenses increased $4 million (6%). This increase was primarily attributable to the Ahmann & Martin Co. acquisition which added approximately 120 colleagues. Fringe benefit expenses were down $2 million (12%) versus the first quarter of 2014.

• Nonpersonnel noninterest expenses on a combined basis were $74 million, up $4 million (6%) from the first quarter of 2014. Technology was up $3 million (22%), as the Corporation continues to invest in solutions that will drive operational efficiency. Occupancy expense was up $2 million (14%), related to a lease termination charge, as the Corporation further consolidated office space in Chicago. FDIC expense of $7 million, was $1 million (30%) higher than the comparable period in 2014 reflecting growth in risk-weighted assets. Other noninterest expense decreased $2 million compared to the first quarter of 2014 primarily due to a reduction in charitable contributions (as the first quarter of 2014 included the contribution of a former bank building to a local not-for-profit organization). All remaining noninterest expense categories on a combined basis were down less than $1 million (2%) compared to first quarter of 2014.

Income Taxes

The Corporation recognized income tax expense of $22 million for the first quarter of 2015, compared to income tax expense of $21 million for the comparable period in 2014. The effective tax rate was 32.49% for the first quarter of 2015, compared to an effective tax rate of 31.35% for the first quarter of 2014.

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 Note 10, “Income Taxes,” of the notes to consolidated financial statements and section “Critical Accounting Policies," for additional information on income taxes.

51

Balance Sheet

At March 31, 2015, total assets were $27.1 billion, up $247 million (1%) from December 31, 2014. Loans of $18.0 billion at March 31, 2015 were up $385 million (2%) from December 31, 2014, primarily attributable to a $270 million increase in commercial loans. Investment securities were $5.8 billion at March 31, 2015, relatively unchanged from year-end 2014. See section "Credit Risk" for additional information on loans.

At March 31, 2015, total deposits of $19.9 billion were up $1.1 billion (6%) from December 31, 2014. See section "Deposits" for additional information on deposits. Short and long-term funding decreased $906 million (18%) since year-end 2014, including a decrease of $406 million in short-term funding (primarily short-term FHLB advances) and a decrease of $500 million in long-term funding due to the early retirement of $500 million of long-term FHLB advances.

TABLE 5

Period End Loan Composition

($ in Thousands)

	March 31, 2015				December 31, 2014				September 30, 2014				June 30, 2014				March 31, 2014
	Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total
Commercial and industrial	$	6,140,420	34	%	$	5,905,902	34	%	$	5,603,899	33	%	$	5,616,205	33	%	$	5,222,141	32	%
Commercial real estate - owner occupied	1,003,885		6		1,007,937		6		1,014,335		6		1,070,463		7		1,098,089		7
Lease financing	49,496		—		51,529		—		52,600		—		51,873		—		52,500		—
Commercial and business lending	7,193,801		40		6,965,368		40		6,670,834		39		6,738,541		40		6,372,730		39
Commercial real estate - investor	3,086,980		17		3,056,485		17		3,043,361		17		2,990,732		17		3,001,219		18
Real estate construction	1,019,571		6		1,008,956		6		982,426		6		1,000,421		6		969,617		6
Commercial real estate lending	4,106,551		23		4,065,441		23		4,025,787		23		3,991,153		23		3,970,836		24
Total commercial	11,300,352		63		11,030,809		63		10,696,621		62		10,729,694		63		10,343,566		63
Home equity revolving lines of credit	879,827		5		887,779		5		880,435		5		866,042		5		856,679		5
Home equity loans first liens	549,667		3		584,131		3		619,774		4		659,598		4		705,835		4
Home equity loans junior liens	154,120		1		164,148		1		176,316		1		187,732		1		199,488		1
Home equity	1,583,614		9		1,636,058		9		1,676,525		10		1,713,372		10		1,762,002		10
Installment and credit cards	436,492		2		454,219		3		459,682		3		469,203		3		393,321		3
Residential mortgage	4,658,574		26		4,472,760		25		4,326,262		25		4,132,783		24		3,942,555		24
Total consumer	6,678,680		37		6,563,037		37		6,462,469		38		6,315,358		37		6,097,878		37
Total loans	$	17,979,032	100	%	$	17,593,846	100	%	$	17,159,090	100	%	$	17,045,052	100	%	$	16,441,444	100	%
Commercial real estate - investor and Real estate construction loan detail:
Farmland	$	8,987	—	%	$	9,249	—	%	$	8,428	—	%	$	8,475	—	%	$	8,286	—	%
Multi-family	926,640		30		976,956		32		1,030,131		34		951,698		32		965,568		32
Non-owner occupied	2,151,353		70		2,070,280		68		2,004,802		66		2,030,559		68		2,027,365		68
Commercial real estate - investor	$	3,086,980	100	%	$	3,056,485	100	%	$	3,043,361	100	%	$	2,990,732	100	%	$	3,001,219	100	%
1-4 family construction	$	300,210	29	%	$	304,992	30	%	$	305,719	31	%	$	293,361	29	%	$	273,470	28	%
All other construction	719,361		71		703,964		70		676,707		69		707,060		71		696,147		72
Real estate construction	$	1,019,571	100	%	$	1,008,956	100	%	$	982,426	100	%	$	1,000,421	100	%	$	969,617	100	%

52

Credit Risk

Total loans were $18.0 billion at March 31, 2015, an increase of $385 million or 2% from December 31, 2014. Commercial and business loans were $7.2 billion, up $228 million (3%) from December 31, 2014, to represent 40% of total loans at March 31, 2015. Commercial real estate totaled $4.1 billion at March 31, 2015 and represented 23% of total loans, an increase of $41 million (1%) from December 31, 2014. Consumer loans were $6.7 billion, up $116 million (2%) from December 31, 2014, and represented 37% of total loans at March 31, 2015.

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 analyses 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.

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 2014 and the first three months of 2015. 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.

Commercial and business lending

The commercial and business lending classification primarily includes commercial loans to large corporations, middle market companies and small businesses. At March 31, 2015, the largest industry groups within the commercial and business loan category included the manufacturing sector which represented 9% of total loans and 22% of the total commercial and business loan portfolio. The next largest industry group within the commercial and business loan category was the Mining sector, which represented 5% of total loans and 11% of the total commercial and business loan portfolio at March 31, 2015. The remaining portfolio is spread over a diverse range of industries, none of which exceeds 5% 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.

Commercial real estate lending

Commercial real estate primarily includes commercial-based loans to investors that are secured by commercial income properties or multifamily projects. Commercial real estate loans are typically intermediate to long-term financings. Loans of this type are mainly secured by commercial income properties or multifamily projects. Credit risk is managed in a similar manner to commercial and business loans 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, multifamily 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.

53

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%. As part of management’s historical practice of originating and servicing residential mortgage loans, generally the Corporation’s 30-year, 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 a portion of its 15-year and under, fixed-rate residential real estate mortgages in its loan portfolio. At March 31, 2015, the residential mortgage portfolio was comprised of $1.4 billion of fixed-rate residential real estate mortgages and $3.3 billion of adjustable-rate residential real estate 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 home equity lines, as well as home equity loans, approximately half of which are first lien positions. 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 second 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. Home equity balances declined as customers continued to deleverage and refinance into lower-priced, first lien residential mortgage loans. Loans and lines in a junior position at March 31, 2015 included approximately 33% for which the Corporation also owned or serviced the related first lien loan and approximately 67% where the Corporation did not service the related first lien loan.

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 variable rate, interest only lines of credit which do not require the payment of principal during the initial revolving period, after which principal payments are required. As of March 31, 2015, approximately 40% of the home equity loan first liens have a remaining maturity of more than 10 years. Based upon outstanding balances at March 31, 2015, the following table presents the periods when home equity lines of credit revolving periods are scheduled to end.

TABLE 6

Home Equity Lines of Credit - Revolving Period End Dates

($ in Thousands)

Home Equity Lines of Credit - Revolving Period End Dates			% to Total
Less than 1 year	$	4,412	1	%
1 — 3 years	3,891		<1%
3 — 5 years	18,579		2	%
5 — 10 years	154,314		18	%
Over 10 years	698,631		79	%
Total home equity revolving lines of credit	$	879,827	100	%

Installment and credit cards

Installment and credit cards consist of student loans, short-term and other personal installment loans and credit cards. Credit risk for non-government guaranteed student, short-term and personal installment loans and credit cards is generally 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 on these smaller retail 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.

54

The loan portfolio is widely diversified by types of borrowers, industry groups, and market areas within our core 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, 2015, no significant concentrations existed in the Corporation’s portfolio in excess of 10% of total loans.

TABLE 7

Commercial Loan Maturity Distribution and Interest Rate Sensitivity

($ in Thousands)

	Maturity(1)
March 31, 2015	Within 1 Year(2)			1-5 Years			After 5 Years			Total			% of Total
	($ in Thousands)
Commercial and industrial	$	4,907,962		$	923,945		$	308,513		$	6,140,420		55	%
Commercial real estate - investor	1,013,748			1,926,462			146,770			3,086,980			27	%
Commercial real estate - owner occupied	319,687			536,531			147,667			1,003,885			9	%
Real estate construction	638,982			338,698			41,891			1,019,571			9	%
Total	$	6,880,379		$	3,725,636		$	644,841		$	11,250,856		100	%
Fixed rate	$	3,224,406		$	1,135,739		$	319,379		$	4,679,524		42	%
Floating or adjustable rate	3,655,973			2,589,897			325,462			6,571,332			58	%
Total	$	6,880,379		$	3,725,636		$	644,841		$	11,250,856		100	%
Percent by maturity distribution	61		%	33		%	6		%	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 $6.6 billion (58%) at March 31, 2015. Including the $3.2 billion of fixed rate loans due within one year, 87% 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.

55

Deposits

TABLE 8

Period End Deposit and Customer Funding Composition

($ in Thousands)

	March 31, 2015				December 31, 2014				September 30, 2014				June 30, 2014				March 31, 2014
	Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total		Amount		% of Total
Noninterest-bearing demand	$	4,570,872	23	%	$	4,505,272	24	%	$	4,302,454	24	%	$	4,211,057	24	%	$	4,478,981	26	%
Savings	1,337,643		7		1,235,277		7		1,256,567		7		1,275,493		7		1,252,669		7
Interest-bearing demand	3,525,870		18		3,126,854		17		3,637,411		20		2,918,900		17		3,084,457		18
Money market	8,781,206		44		8,324,646		44		7,491,460		41		7,348,650		43		7,069,173		40
Brokered CDs	40,699		—		42,556		—		9,242		—		44,809		—		51,235		—
Other time	1,595,302		8		1,528,899		8		1,504,124		8		1,517,350		9		1,573,412		9
Total deposits	$	19,851,592	100	%	$	18,763,504	100	%	$	18,201,258	100	%	$	17,316,259	100	%	$	17,509,927	100	%
Customer funding	528,572				384,221				493,451				489,886				548,179
Total deposits and customer funding	$	20,380,164			$	19,147,725			$	18,694,709			$	17,806,145			$	18,058,106
Network transaction deposits included above in interest-bearing demand and money market	$	2,900,325			$	2,852,943			$	2,207,055			$	2,238,923			$	2,141,976
Total network transaction deposits and Brokered CDs	2,941,024				2,895,499				2,216,297				2,283,732				2,193,211
Total deposits and customer funding, excluding Brokered CDs and network transaction deposits	$	17,439,140			$	16,252,226			$	16,478,412			$	15,522,413			$	15,864,895
Time deposits of $100,000 or more	$	510,977			$	457,254			$	394,438			$	418,561			$	450,420
Time deposits of more than $250,000	$	188,328			$	152,059			$	135,101			$	130,532			$	146,164

• Deposits are the Corporation’s largest source of funds. Selected period-end deposit information is detailed in Table 8. Total deposits increased $2.3 billion (13%) from March 31, 2014, and increased $1.1 billion (6%) from December 31, 2014, primarily in money market and interest bearing demand accounts.

56

Allowance for Credit Losses

TABLE 9

Allowance for Credit Losses

($ in Thousands)

	At and For the Three Months Ended March 31,										At and For the Year Ended December 31,
	2015					2014					2014
Allowance for Loan Losses:
Balance at beginning of period	$	266,302				$	268,315				$	268,315
Provision for loan losses	4,500					5,000					13,000
Charge offs	(13,270		)			(11,361		)			(44,096		)
Recoveries	7,736					5,962					29,083
Net charge offs	(5,534		)			(5,399		)			(15,013		)
Balance at end of period	$	265,268				$	267,916				$	266,302
Allowance for Unfunded Commitments:
Balance at beginning of period	$	24,900				$	21,900				$	21,900
Provision for unfunded commitments	—					—					3,000
Balance at end of period	$	24,900				$	21,900				$	24,900
Allowance for credit losses (A)	$	290,168				$	289,816				$	291,202
Provision for credit losses (B)	$	4,500				$	5,000				$	16,000
Net loan charge offs (recoveries):				(C)					(C)					(C)
Commercial and industrial	$	4,650		32		$	2,725		22		$	3,243		6
Commercial real estate - owner occupied	739			30		(124		)	(5	)	1,670			16
Lease financing	—			—		—			—		32			6
Commercial and business lending	5,389			31		2,601			17		4,945			8
Commercial real estate - investor	(2,529		)	(33	)	(1,031		)	(14	)	(5,467		)	(18	)
Real estate construction	(743		)	(30	)	113			5		1,142			12
Commercial real estate lending	(3,272		)	(32	)	(918		)	(10	)	(4,325		)	(11	)
Total commercial	2,117			8		1,683			7		620			1
Home equity revolving lines of credit	1,220			56		1,182			55		4,754			54
Home equity loans first liens	362			26		406			23		1,178			18
Home equity loans junior liens	423			108		859			171		2,992			160
Home equity	2,005			51		2,447			55		8,924			52
Installment and credit cards	769			70		113			11		2,260			53
Residential mortgage	643			6		1,156			12		3,209			8
Total consumer	3,417			21		3,716			25		14,393			23
Total net charge offs	$	5,534		13		$	5,399		14		$	15,013		9
CRE & Construction Net Charge Off Detail:				(C)					(C)					(C)
Multi-family	$	4		—		$	(49	)	(2	)	$	(6,170	)	(62	)
Non-owner occupied	(2,533		)	(48	)	(982		)	(20	)	703			3
Commercial real estate - investor	$	(2,529	)	(33	)	$	(1,031	)	(14	)	$	(5,467	)	(18	)
1-4 family construction	$	(204	)	(27	)	$	(121	)	(18	)	$	(369	)	(12	)
All other construction	(539		)	(32	)	234			15		1,511			22
Real estate construction	$	(743	)	(30	)	$	113		5		$	1,142		12
(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.
(C) – Annualized ratio of net charge offs to average loans by loan type in basis points.
Ratios:
Allowance for loan losses to total loans	1.48		%			1.63		%			1.51		%
Allowance for loan losses to net charge offs (annualized)	11.8x					12.2x					17.7x

57

TABLE 9 (continued)

Allowance for Credit Losses

($ in Thousands)

Quarterly Trends:	March 31, 2015					December 31, 2014					September 30, 2014					June 30, 2014					March 31, 2014
Allowance for Loan Losses:
Balance at beginning of period	$	266,302				$	266,262				$	271,851				$	267,916				$	268,315
Provision for loan losses	4,500					4,500					(3,000		)			6,500					5,000
Charge offs	(13,270		)			(8,778		)			(14,850		)			(9,107		)			(11,361		)
Recoveries	7,736					4,318					12,261					6,542					5,962
Net charge offs	(5,534		)			(4,460		)			(2,589		)			(2,565		)			(5,399		)
Balance at end of period	$	265,268				$	266,302				$	266,262				$	271,851				$	267,916
Allowance for Unfunded Commitments:
Balance at beginning of period	$	24,900				$	24,400				$	20,400				$	21,900				$	21,900
Provision for unfunded commitments	—					500					4,000					(1,500		)			—
Balance at end of period	$	24,900				$	24,900				$	24,400				$	20,400				$	21,900
Allowance for credit losses (A)	$	290,168				$	291,202				$	290,662				$	292,251				$	289,816
Provision for credit losses (B)	$	4,500				$	5,000				$	1,000				$	5,000				$	5,000
Net loan charge offs (recoveries):				(C)					(C)					(C)					(C)					(C)
Commercial and industrial	$	4,650		32		$	1,323		9		$	572		4		$	(1,377	)	(10	)	$	2,725		22
Commercial real estate - owner occupied	739			30		134			5		2,210			84		(550		)	(20	)	(124		)	(5	)
Lease financing	—			—		9			7		(6		)	(5	)	29			22		—			—
Commercial and business lending	5,389			31		1,466			9		2,776			17		(1,898		)	(12	)	2,601			17
Commercial real estate - investor	(2,529		)	(33	)	(132		)	(2	)	(4,065		)	(54	)	(239		)	(3	)	(1,031		)	(14	)
Real estate construction	(743		)	(30	)	(116		)	(5	)	350			14		795			33		113			5
Commercial real estate lending	(3,272		)	(32	)	(248		)	(2	)	(3,715		)	(37	)	556			6		(918		)	(10	)
Total commercial	2,117			8		1,218			4		(939		)	(3	)	(1,342		)	(5	)	1,683			7
Home equity revolving lines of credit	1,220			56		1,094			49		1,098			50		1,380			64		1,182			55
Home equity loans first liens	362			26		206			14		118			7		448			26		406			23
Home equity loans junior liens	423			108		457			107		728			159		948			196		859			171
Home equity	2,005			51		1,757			42		1,944			45		2,776			64		2,447			55
Installment and credit cards	769			70		990			86		910			78		247			25		113			11
Residential mortgage	643			6		495			4		674			6		884			9		1,156			12
Total consumer	3,417			21		3,242			19		3,528			22		3,907			25		3,716			25
Total net charge offs	$	5,534		13		$	4,460		10		$	2,589		6		$	2,565		6		$	5,399		14
CRE & Construction Net Charge Off Detail:				(C)					(C)					(C)					(C)					(C)
Multi-family	$	4		—		$	(81	)	(3	)	$	(6,022	)	(243	)	$	(18	)	(1	)	$	(49	)	(2	)
Non-owner occupied	(2,533		)	(48	)	(51		)	(1	)	1,957			38		(221		)	(4	)	(982		)	(20	)
Commercial real estate - investor	$	(2,529	)	(33	)	$	(132	)	(2	)	$	(4,065	)	(54	)	$	(239	)	(3	)	$	(1,031	)	(14	)
1-4 family construction	$	(204	)	(27	)	$	(199	)	(25	)	$	(53	)	(7	)	$	4		1		$	(121	)	(18	)
All other construction	(539		)	(32	)	83			5		403			23		791			48		234			15
Real estate construction	$	(743	)	(30	)	$	(116	)	(5	)	$	350		14		$	795		33		$	113		5
(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.
(C) – Annualized ratio of net charge offs to average loans by loan type in basis points.

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 briefly in the section entitled “Credit Risk.”

58

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.

In general, the change in the allowance for credit losses is a function of a number of factors, including but not limited to changes in the loan portfolio (see Table 5), net charge offs (see Table 9) and nonperforming assets (see Table 10). To assess the appropriateness of the allowance for loan losses, an allocation methodology is applied by the Corporation which focuses on an 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. While management uses currently available information to recognize losses on loans, future adjustments to the allowance for loan losses may be necessary based on newly received appraisals, updated commercial customer financial statements, rapidly deteriorating customer cash flow, and changes in economic conditions that affect our customers. Management considers the allowance for loan losses a critical accounting policy (see section “Critical Accounting Policies”), as assessing these numerous factors involves significant judgment.

The methodology used for the allowance for loan losses at March 31, 2015 and December 31, 2014 was generally comparable, whereby the Corporation segregated its loss factors (used for both criticized and non-criticized loan categories) 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). 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 the allowance for loan losses to absorb unrecognized losses that may not be provided for by the other components 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. Because each of the criteria used is subject to change, the allocation of the allowance for loan losses is made for analytical purposes and is not necessarily indicative of the trend of future loan losses in any particular category. The total allowance for loan losses is available to absorb losses from any segment of the loan portfolio.

The methodology used for the allowance for unfunded commitments at March 31, 2015 and December 31, 2014 was also generally comparable. Management evaluated the unfunded credit facilities, including an assessment of historical commitment utilization experience and credit risk grading of the loan.

At both March 31, 2015 and March 31, 2014, the allowance for credit losses was $290 million, compared to $291 million at December 31, 2014. At March 31, 2015, the allowance for loan losses to total loans was 1.48% and covered 152% of nonaccrual loans, compared to 1.63% and 151%, respectively, at March 31, 2014, and 1.51% and 150%, respectively, at December 31, 2014. Tables 9 and 10 provide additional information regarding activity in the allowance for loan losses, impaired loans, and nonperforming assets. See Note 7, “Loans, Allowance for Credit Losses, and Credit Quality,” of the notes to consolidated financial statements for additional allowance for credit losses disclosures.

Management believes the level of allowance for loan losses and allowance for unfunded commitments to be appropriate at March 31, 2015 and December 31, 2014.

59

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

TABLE 10

Nonperforming Assets

($ in Thousands)

	March 31, 2015			December 31, 2014			September 30, 2014			June 30, 2014			March 31, 2014
Nonperforming assets by type:
Commercial and industrial	$	61,620		$	49,663		$	51,143		$	40,846		$	38,488
Commercial real estate - owner occupied	21,861			25,825			24,340			31,725			26,735
Lease financing	1,720			1,801			1,947			1,541			172
Commercial and business lending	85,201			77,289			77,430			74,112			65,395
Commercial real estate - investor	13,742			22,685			25,106			28,135			33,611
Real estate construction	5,423			5,399			8,187			6,988			6,667
Commercial real estate lending	19,165			28,084			33,293			35,123			40,278
Total commercial	104,366			105,373			110,723			109,235			105,673
Home equity revolving lines of credit	9,171			9,853			10,154			10,056			10,356
Home equity loans first liens	5,111			5,290			4,664			4,634			5,341
Home equity loans junior liens	6,145			6,598			6,443			6,183			6,788
Home equity	20,427			21,741			21,261			20,873			22,485
Installment and credit cards	515			613			653			771			915
Residential mortgage	49,038			49,686			51,501			48,347			48,905
Total consumer	69,980			72,040			73,415			69,991			72,305
Total nonaccrual loans (“NALs”)	$	174,346		$	177,413		$	184,138		$	179,226		$	177,978
Commercial real estate owned	$	10,620		$	11,699		$	10,733		$	9,498		$	8,224
Residential real estate owned	3,474			4,111			4,676			6,182			6,313
Bank properties real estate owned	832			922			1,431			2,049			4,636
Other real estate owned (“OREO”)	14,926			16,732			16,840			17,729			19,173
Total nonperforming assets (“NPAs”)	$	189,272		$	194,145		$	200,978		$	196,955		$	197,151
Commercial real estate & Real estate construction NALs detail:
Multi-family	$	423		$	2,478		$	2,518		$	3,929		$	3,713
Non-owner occupied	13,319			20,207			22,588			24,206			29,898
Commercial real estate - investor	$	13,742		$	22,685		$	25,106		$	28,135		$	33,611
1-4 family construction	$	1,304		$	1,262		$	1,350		$	1,843		$	1,900
All other construction	4,119			4,137			6,837			5,145			4,767
Real estate construction	$	5,423		$	5,399		$	8,187		$	6,988		$	6,667
Accruing loans past due 90 days or more:
Commercial	$	197		$	254		$	269		$	289		$	16
Consumer	1,518			1,369			1,421			1,487			707
Total accruing loans past due 90 days or more	$	1,715		$	1,623		$	1,690		$	1,776		$	723
Restructured loans (accruing):
Commercial	$	59,738		$	68,200		$	73,774		$	83,999		$	88,329
Consumer	29,079			30,016			30,829			30,382			28,595
Total restructured loans (accruing)	$	88,817		$	98,216		$	104,603		$	114,381		$	116,924
Nonaccrual restructured loans (included in nonaccrual loans)	$	53,553		$	57,656		$	63,314		$	72,388		$	74,231
Ratios:
Nonaccrual loans to total loans	0.97		%	1.01		%	1.07		%	1.05		%	1.08		%
NPAs to total loans plus OREO	1.05		%	1.10		%	1.17		%	1.15		%	1.20		%
NPAs to total assets	0.70		%	0.72		%	0.78		%	0.77		%	0.79		%
Allowance for loan losses to NALs	152.15		%	150.10		%	144.60		%	151.68		%	150.53		%
Allowance for loan losses to total loans	1.48		%	1.51		%	1.55		%	1.59		%	1.63		%

60

Table 10 (continued)

Nonperforming Assets

($ in Thousands)

	March 31, 2015		December 31, 2014		September 30, 2014		June 30, 2014		March 31, 2014
Loans 30-89 days past due by type:
Commercial and industrial	$	1,717	$	14,747	$	3,947	$	2,519	$	4,126
Commercial real estate - owner occupied	1,849		10,628		2,675		6,323		5,342
Lease financing	—		—		—		556		567
Commercial and business lending	3,566		25,375		6,622		9,398		10,035
Commercial real estate - investor	2,215		1,208		15,869		2,994		7,188
Real estate construction	317		984		399		258		679
Commercial real estate lending	2,532		2,192		16,268		3,252		7,867
Total commercial	6,098		27,567		22,890		12,650		17,902
Home equity revolving lines of credit	7,150		6,725		6,739		6,986		5,344
Home equity loans first liens	953		1,800		1,503		1,685		1,469
Home equity loans junior liens	1,905		2,058		2,496		2,138		3,006
Home equity	10,008		10,583		10,738		10,809		9,819
Installment and credit cards	1,818		1,932		1,818		1,734		1,269
Residential mortgage	3,403		3,046		3,231		7,070		4,498
Total consumer	15,229		15,561		15,787		19,613		15,586
Total loans past due 30-89 days	$	21,327	$	43,128	$	38,677	$	32,263	$	33,488
Commercial real estate & Real estate construction loans 30-89 days past due detail:
Multi-family	$	849	$	687	$	—	$	—	$	2,524
Non-owner occupied	1,366		521		15,869		2,994		4,664
Commercial real estate - investor	$	2,215	$	1,208	$	15,869	$	2,994	$	7,188
1-4 family construction	$	317	$	527	$	345	$	242	$	327
All other construction	—		457		54		16		352
Real estate construction	$	317	$	984	$	399	$	258	$	679
Potential problem loans by type:
Commercial and industrial	$	138,403	$	108,522	$	133,416	$	187,251	$	109,027
Commercial real estate - owner occupied	43,114		48,695		49,008		57,757		64,785
Lease financing	2,009		2,709		3,787		2,280		3,065
Commercial and business lending	183,526		159,926		186,211		247,288		176,877
Commercial real estate - investor	26,026		24,043		28,474		31,903		34,790
Real estate construction	1,487		1,776		2,227		4,473		4,870
Commercial real estate lending	27,513		25,819		30,701		36,376		39,660
Total commercial	211,039		185,745		216,912		283,664		216,537
Home equity revolving lines of credit	247		204		224		277		310
Home equity loans first liens	—		—		—		—		—
Home equity loans junior liens	711		676		687		822		741
Home equity	958		880		911		1,099		1,051
Installment and credit cards	—		2		4		844		—
Residential mortgage	6,621		3,781		2,166		2,445		2,091
Total consumer	7,579		4,663		3,081		4,388		3,142
Total potential problem loans	$	218,618	$	190,408	$	219,993	$	288,052	$	219,679

61

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 10 provides detailed information regarding nonperforming assets, which include nonaccrual loans and other real estate owned.

Nonaccrual Loans: Nonaccrual loans are considered one indicator of potential future loan losses. See also Note 7, "Loans, Allowance for Credit Losses, and Credit Quality," of the notes to consolidated financial statements for additional nonaccrual loan disclosures. The ratio of nonaccrual loans to total loans was 0.97% at March 31, 2015, compared to 1.08% at March 31, 2014 and 1.01% at December 31, 2014. The Corporation’s allowance for loan losses to nonaccrual loans was 152% at March 31, 2015, up from 151% at March 31, 2014 and up from to 150% at December 31, 2014, respectively.

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. At March 31, 2015, accruing loans 90 days or more past due totaled $2 million, up $1 million from March 31, 2014 and relatively unchanged from December 31, 2014.

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, Allowance for Credit Losses, and Credit Quality," of the notes to consolidated financial statements for management's accounting policy for restructured loans and for additional restructured loan 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 loans that have been reported as potential problem loans are predominantly commercial loans covering a diverse range of businesses and real estate property types.

Other Real Estate Owned: Other real estate owned was $15 million at March 31, 2015, compared to $19 million at March 31, 2014 and $17 million at December 31, 2014, respectively. Write-downs on other real estate owned were negligible for the first quarter of 2015 and were $1 million for the first quarter of 2014, and $2 million for the full year 2014. Management actively seeks to ensure properties held are monitored to minimize the Corporation’s risk of loss.

Liquidity

The objective of liquidity 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 fall due, including the ability to pay dividends to shareholders, service debt, invest in subsidiaries or acquisitions, and satisfy other operating requirements. In addition to satisfying cash flow requirements in the ordinary course of business, the Corporation actively monitors and manages its liquidity position to ensure sufficient resources are available to meet cash flow requirements in adverse situations.

The Corporation’s internal liquidity management framework includes measurement of several key elements, such as deposit funding as a percent of total assets and liquid asset levels. Strong capital ratios, credit quality, and core earnings are essential to maintaining cost-effective access to wholesale funding markets. A downgrade or loss in credit ratings could have an impact on the Corporation’s ability to access wholesale funding at favorable interest rates. In addition to static liquidity measures, 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. At March 31, 2015, the Corporation was in compliance with its internal liquidity objectives.

62

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. Among other factors, the credit ratings are based on financial strength, credit quality and concentrations in the loan portfolio, the level and volatility of earnings, capital adequacy, the quality of management, the liquidity of the balance sheet, the availability of a significant base of core deposits, and the Corporation’s ability to access a broad array of wholesale funding sources. 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. Ratings are subject to revision or withdrawal at any time and each rating should be evaluated independently. The senior credit ratings of the Parent Company and its subsidiary bank are displayed below.

	March 31, 2015
	Moody’s	S&P
Bank short-term	P2	—
Bank long-term	A3	BBB+
Corporation short-term	P2	—
Corporation long-term	Baa1	BBB
Outlook	Stable	Stable

The Corporation also has multiple funding sources that could be used to increase liquidity and provide additional financial flexibility. The Parent Company has filed a shelf registration 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 has also filed a universal shelf registration statement, under which the Parent Company may offer securities, either separately or in units: debt securities, preferred stock, depositary shares, common stock, and warrants. The Parent Company also has a $200 million commercial paper program, of which, $75 million was outstanding at March 31, 2015. Dividends and service fees from subsidiaries and proceeds from issuance of capital are also funding sources for the Parent Company.

The Bank has established federal funds lines with counterparty banks and has the ability to borrow from the Federal Home Loan Bank of Chicago ($2.5 billion of Federal Home Loan Bank advances were outstanding at March 31, 2015). The Bank also has significant excess investment securities collateral and pledged loan capacity which could be utilized to secure additional deposits, repurchase agreements, or Federal Home Loan Bank advances as necessary. Associated Bank may also issue institutional certificates of deposit, network transaction deposits, and brokered certificates of deposit.

Investment securities are an important tool to the Corporation’s liquidity objective. As of March 31, 2015, the majority of investment securities are classified as available for sale, with only a portion of municipal securities classified as held to maturity. Of the $5.8 billion investment securities portfolio at March 31, 2015, a portion of these securities were pledged to secure collateralized deposits and repurchase agreements and for other purposes as required or permitted by law. The majority of the remaining investment securities of $2.5 billion could be pledged or sold to enhance liquidity, if necessary.

For the three months endedMarch 31, 2015, net cash provided by operating activities and financing activities was $18 million and $132 million, respectively, while net cash used in investing activities was $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.

For the three months endedMarch 31, 2014, net cash provided by operating activities and financing activities was $73 million and $536 million, respectively, while net cash used in investing activities was $588 million, for a net increase in cash and cash equivalents of $21 million since year-end 2013. During the first three months of 2014, loans increased $545 million and investment securities increased $46 million. On the funding side, deposits increased $243 million and short-term funding increased $507 million, while long-term funding decreased $155 million.

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.

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Policies established by the Corporation’s Asset / Liability Committee (“ALCO”) and approved by the Board of Directors are intended to manage 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 tolerance for interest rate risk over both short-term and long-term horizons. No limit breaches occurred during the first quarter of 2015.

The major sources of our non-trading interest rate risk are timing differences in the maturity and repricing 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, as described in additional detail below, 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, 2015.

MVE and EAR are complementary interest rate risk metrics and should be viewed together. Net interest income and EAR sensitivity capture asset and liability repricing mismatches for the first year inclusive of forecast balance sheet changes and are considered shorter term measures, while MVE sensitivity captures mismatches within the period end balance sheets through the financial instruments’ respective maturities and is considered a longer term measure.

A positive NII and EAR sensitivity in a rising rate environment indicates that over the forecast horizon of one year, asset based income will increase more quickly than liability based expense due to the balance sheet composition. A negative MVE sensitivity in a rising rate environment indicates that the value of financial assets will decrease more than the value of financial liabilities.

One of the primary methods that we use to quantify and manage interest rate risk is simulation analysis, which we use to model net interest income from assets, liabilities, and derivative positions under various interest rate scenarios and balance sheet structures. As the future path of interest rates cannot be known, we use simulation analysis to project rate sensitive income under various scenarios including implied forward and deliberately extreme and perhaps unlikely scenarios. The analyses may include rapid and gradual ramping of interest rates, rate shocks, basis risk analysis, and yield curve twists. Specific strategies are also analyzed to determine their impact on net interest income levels and sensitivities.

Key assumptions in the simulation analysis (and in the valuation analysis discussed below) relate to the behavior of interest rates and spreads, the changes in product balances, and the behavior of loan and deposit clients in different rate environments. This analysis incorporates several assumptions, the most material of which relate to the repricing characteristics and balance fluctuations of deposits with indeterminate or non-contractual maturities.

The sensitivity analysis included below is measured as a percentage change in net interest income and EAR due to instantaneous moves in benchmark interest rates. Estimated changes set forth below are dependent upon material assumptions such as those previously discussed. We evaluate the sensitivity using: 1) a dynamic balance sheet forecast incorporating business as usual, and 2) a static balance sheet where the current balance sheet is held constant.

TABLE 11

Estimated % Change in Net Interest Income Over 12 Months

	Estimated % Change in Rate Sensitive Earnings at Risk (EAR) Over 12 Months
	Dynamic Forecast		Static Forecast		Dynamic Forecast		Static Forecast
Instantaneous Rate Change	March 31, 2015		March 31, 2015		December 31, 2014		December 31, 2014
100 bp increase in interest rates	2.1	%	2.5	%	1.6	%	2.8	%
200 bp increase in interest rates	4.6	%	5.4	%	3.4	%	5.3	%

The interest rate sensitivity incorporates the recent $250 million issuance of 5-year senior notes and $250 million issuance of 10-year subordinated notes in November 2014.

We also perform valuation analysis, which we use for discerning levels of risk present in the balance sheet and derivative positions that might not be taken into account in the net interest income simulation analysis. Whereas NII and EAR simulation highlights exposures over a relatively short time horizon, valuation analysis incorporates all cash flows over the estimated remaining life of all balance sheet and derivative positions. The valuation of the balance sheet, at a point in time, is defined as the discounted present value of asset cash flows and derivative cash flows minus the discounted present value of liability cash flows, the net of which is referred to as MVE. The sensitivity of MVE to changes in the level of interest rates is a measure of the longer-term repricing risk and options risk embedded in the balance sheet. Similar to the net interest income simulation, MVE uses instantaneous changes

64

in rates. However, MVE values only the current balance sheet and does not incorporate the growth assumptions that are used in the NII and EAR simulations. As with NII and EAR simulations, assumptions about the timing and variability of balance sheet cash flows are critical in the MVE analysis. Particularly important are the assumptions driving prepayments and the expected changes in balances and pricing of the indeterminate deposit portfolios. At March 31, 2015, the MVE profile indicates a decline in net balance sheet value due to instantaneous upward changes in rates. MVE sensitivity is reported in both upward and downward rate shocks.

TABLE 12

Market Value of Equity Sensitivity

Instantaneous Rate Change	March 31, 2015		December 31, 2014
100 bp increase in interest rates	(1.0	)%	(1.0	)%
200 bp increase in interest rates	(2.8	)%	(2.5	)%

The slight decrease in MVE sensitivity from December 31, 2014 was primarily attributable being 3 months closer to the planned redemption date of $430 million of senior notes in February 2016. 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, we believe 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, 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 net interest income simulation and valuation analyses do not include 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 13

Contractual Obligations and Other Commitments

($ in Thousands)

	One Year or Less		One to Three Years		Three to Five Years		Over Five Years		Total
Time deposits	$	973,380	$	367,417	$	277,263	$	17,941	$	1,636,001
Short-term funding	662,537		—		—		—		662,537
Long-term funding	—		431,025		2,749,749		249,151		3,429,925
Operating leases	10,477		21,061		17,139		25,668		74,345
Commitments to extend credit	3,181,657		1,770,153		1,560,233		57,836		6,569,879
Total	$	4,828,051	$	2,589,656	$	4,604,384	$	350,596	$	12,372,687

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, 2015, is included in Note 11, “Derivative and Hedging Activities,” of the notes to consolidated financial statements. A discussion of the Corporation’s lending-related commitments is included in Note 13, “Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities,” 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 13 summarizes significant contractual obligations and other commitments at March 31, 2015, 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

Stockholders’ equity at March 31, 2015 was $2.9 billion, up $82 million from December 31, 2014. At March 31, 2015, stockholders’ equity included $25 million of accumulated other comprehensive income compared to $5 million of accumulated other comprehensive loss at December 31, 2014. Cash dividends of $0.10 per share were paid in the first quarter of 2015 and cash dividends of $0.09 per share were paid in the first quarter of 2014. The ratio of total stockholders’ equity to assets was 10.65% at March 31, 2015 and 10.44% at December 31, 2014, respectively.

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. 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 14.

During the first quarter of 2015, the Corporation repurchased $30 million, or approximately 1.7 million shares of common stock, at an average cost of $17.27 per share. 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 2015. 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.

In July 2013, the Federal Reserve and the OCC issued final rules establishing a new comprehensive capital framework for U.S. banking organizations that would implement the Basel III capital framework. Under the final rules, minimum requirements will increase for both the quantity and quality of capital held by the Corporation. The rules include a new Common Equity Tier 1 capital to risk weighted assets minimum ratio of 4.5%, raise the minimum ratio of Tier 1 capital to risk-weighted assets from 4.0% to 6.0%, require a minimum ratio of Total Capital to risk-weighted assets of 8.0%, and require a minimum Tier 1 leverage ratio of 4.0%. A new capital conservation buffer, comprised of common equity Tier 1 capital, was also established above the regulatory minimum capital requirements. This capital conservation buffer will be phased in beginning January 1, 2016. The final rules also revise the definition and calculation of Tier 1 capital, Total Capital, and risk-weighted assets.

The phase-in period for the final rules became effect for the Corporation on January 1, 2015, with full compliance with all of the final rules' requirements phased in over a multi-year schedule, to be fully phased-in by January 1, 2019. As of March 31, 2015, the Corporation's capital levels remained characterized as "well-capitalized" under the new rules.

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TABLE 14

Capital Ratios

(In Thousands, except per share data)

	Quarter Ended
	March 31, 2015			December 31, 2014			September 30, 2014			June 30, 2014			March 31, 2014
Total stockholders’ equity	$	2,882,138		$	2,800,251		$	2,869,578		$	2,929,946		$	2,901,024
Tangible stockholders’ equity (1)	1,895,112			1,863,646			1,932,198			1,991,576			1,961,663
Tier 1 capital (2)	1,897,390			1,868,059			1,933,923			1,980,675			1,973,240
Common Equity Tier 1 (3)	1,837,663			1,808,332			1,872,899			1,919,651			1,912,083
Tangible common equity (1)	1,835,385			1,803,919			1,871,174			1,930,552			1,900,505
Total risk-based capital (2)	2,391,797			2,350,898			2,160,143			2,205,423			2,187,637
Tangible assets (1)	26,081,714			25,885,169			24,716,442			24,789,416			23,866,836
Risk weighted assets (2)	19,574,457			18,567,647			18,031,157			17,911,201			17,075,004
Market capitalization	2,856,346			2,823,227			2,730,811			2,920,788			2,946,399
Book value per common share	$	18.38		$	18.08		$	17.92		$	17.76		$	17.41
Tangible book value per common share	11.95			11.90			11.94			11.95			11.65
Cash dividend per common share	0.10			0.10			0.09			0.09			0.09
Stock price at end of period	18.60			18.63			17.42			18.08			18.06
Low closing price for the period	16.62			16.75			17.42			16.82			15.58
High closing price for the period	19.07			19.37			18.90			18.39			18.35
Total stockholders’ equity / assets	10.65		%	10.44		%	11.19		%	11.39		%	11.69		%
Tangible common equity / tangible assets (1)	7.04		%	6.97		%	7.57		%	7.79		%	7.96		%
Tangible stockholders’ equity / tangible assets (1)	7.27		%	7.20		%	7.82		%	8.03		%	8.22		%
Common Equity Tier 1 / risk-weighted assets (2,3)	9.39		%	9.74		%	10.39		%	10.72		%	11.20		%
Tier 1 leverage ratio (2)	7.39		%	7.48		%	7.87		%	8.26		%	8.46		%
Tier 1 risk-based capital ratio (2)	9.69		%	10.06		%	10.73		%	11.06		%	11.56		%
Total risk-based capital ratio (2)	12.22		%	12.66		%	11.98		%	12.31		%	12.81		%
Common shares outstanding (period end)	153,567			151,542			156,763			161,548			163,145
Basic common shares outstanding (average)	150,070			151,931			155,925			159,940			161,467
Diluted common shares outstanding (average)	151,164			153,083			156,991			160,838			162,188

(1) Tangible stockholders’ equity, tangible common equity, and tangible assets are non-GAAP financial measures. Additionally, any ratios utilizing these financial measures are non-GAAP measures. 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. Tangible stockholders’ equity is defined as stockholders’ equity excluding goodwill and other intangible assets. Tangible common equity is defined as common stockholders’ equity excluding goodwill and other intangible assets. Tangible assets is defined as total assets excluding goodwill and other intangible assets.

(2) The FRB establishes capital adequacy requirements, including well-capitalized standards for the Corporation. The OCC establishes similar capital adequacy requirements and standards for the Bank. Regulatory capital primarily consists of Tier 1 risk-based capital and Tier 2 risk-based capital. The sum of Tier 1 risk-based capital and Tier 2 risk-based capital equals our total risk-based capital. Risk-based capital guidelines require a minimum level of capital as a percentage of risk-weighted assets. Risk-weighted assets consist of total assets plus certain off-balance sheet and market items, subject to adjustment for predefined credit risk factors. Prior to 2015, the regulatory capital requirements effective for the Corporation followed the Capital Accord of the Basel Committee on Banking Supervision ("Basel I"). Beginning January 1, 2015, the regulatory capital requirements effective for the Corporation follow Basel III, subject to certain transition provisions from Basel I over the next three years to full implementation by January 1, 2018.

(3) Common Equity Tier 1, a non-GAAP financial measure, is used by banking regulators, investors and analysts to assess and compare the quality and composition of our capital with the capital of other financial services companies. Management uses Common Equity Tier 1, along with other capital measures, to assess and monitor our capital position. Common Equity Tier 1 for 2015 follows Basel III and is defined as common stock and related surplus, net of treasury stock, plus retained earnings. Common Equity Tier 1 for 2014 follows Basel I and is defined as Tier 1 capital excluding qualifying perpetual preferred stock and qualifying trust preferred securities.

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TABLE 15

Selected Quarterly Information

($ in Thousands)

	Quarter Ended
	March 31, 2015			December 31, 2014			September 30, 2014			June 30, 2014			March 31, 2014
Summary of Operations:
Net interest income	$	167,813		$	174,661		$	172,630		$	168,703		$	164,973
Provision for credit losses	4,500			5,000			1,000			5,000			5,000
Noninterest income
Trust service fees	12,087			12,457			12,218			12,017			11,711
Service charges on deposit accounts	15,806			17,006			17,961			17,412			16,400
Card-based and other nondeposit fees	12,416			12,019			12,407			12,577			12,509
Insurance commissions	19,728			10,593			7,860			13,651			12,317
Brokerage and annuity commissions	3,683			3,496			4,040			4,520			4,033
Total core fee-based revenue	63,720			55,571			54,486			60,177			56,970
Mortgage banking, net	7,408			2,928			6,669			5,362			6,361
Capital market fees, net	2,467			2,613			2,939			2,099			2,322
Bank owned life insurance income	2,875			2,739			3,506			3,011			4,320
Asset gains, net	1,096			3,727			4,934			899			728
Investment securities gains, net	—			25			57			34			378
Other	2,510			2,040			2,317			665			2,442
Total noninterest income	80,076			69,643			74,908			72,247			73,521
Noninterest expense
Personnel expense	100,152			97,258			97,650			97,793			97,698
Occupancy	17,683			14,589			13,743			13,785			15,560
Equipment	5,772			6,148			6,133			6,227			6,276
Technology	15,558			14,581			13,573			14,594			12,724
Business development and advertising	5,327			8,538			7,467			5,077			5,062
Other intangible amortization	801			775			990			991			991
Loan expense	2,996			3,646			3,813			3,620			2,787
Legal and professional fees	4,538			4,257			4,604			4,436			4,188
Foreclosure / OREO expense	1,425			1,168			2,083			1,575			1,896
FDIC expense	6,500			6,956			6,859			4,945			5,001
Other	13,503			13,889			14,938			14,882			15,475
Total noninterest expense	174,255			171,805			171,853			167,925			167,658
Income tax expense	22,462			18,761			24,478			21,660			20,637
Net income	46,672			48,738			50,207			46,365			45,199
Preferred stock dividends	1,228			1,225			1,255			1,278			1,244
Net income available to common equity	$	45,444		$	47,513		$	48,952		$	45,087		$	43,955
Taxable equivalent net interest income	$	172,919		$	179,631		$	177,568		$	173,360		$	169,629
Net interest margin	2.89		%	3.04		%	3.06		%	3.08		%	3.12		%
Effective tax rate	32.49		%	27.79		%	32.77		%	31.84		%	31.35		%
Average Balances:
Assets	$	26,606,925		$	25,880,765		$	25,472,052		$	24,858,072		$	24,213,213
Earning assets	24,148,026			23,492,497			23,096,717			22,537,515			21,892,503
Interest-bearing liabilities	19,168,979			18,452,797			18,158,989			17,711,534			16,962,190
Loans	17,815,115			17,387,255			17,140,961			16,646,389			16,164,617
Deposits	19,055,196			18,532,419			17,873,378			17,172,832			16,990,272
Short and long-term funding	4,440,340			4,287,409			4,525,265			4,612,012			4,138,223
Stockholders’ equity	$	2,844,729		$	2,832,337		$	2,876,079		$	2,891,118		$	2,888,768

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Sequential Quarter Results

The Corporation recorded net income of $47 million for the first quarter of 2015, compared to net income of $49 million for the fourth quarter of 2014. Net income available to common equity was $45 million for the first quarter of 2015 or net income of $0.30 for both basic and diluted earnings per common share. Comparatively, net income available to common equity for the fourth quarter of 2014, was $48 million, or net income of $0.31 for both basic and diluted earnings per common share (see Table 1).

Taxable equivalent net interest income for the first quarter of 2015 was $173 million, $7 million lower than the fourth quarter of 2014, due to lower interest recoveries and the day count difference between quarters. The Federal funds target rate was unchanged for both quarters. The net interest margin in the first quarter of 2015 was down 15 bp, to 2.89%. Average earning assets increased $656 million to $24.1 billion in the first quarter of 2015, with average loans up $428 million (predominantly in commercial and residential mortgage loans) and average investments and other short-term investments up $228 million (primarily in interest bearing deposits in other banks, municipal securities and mortgage-related securities). On the funding side, average short and long-term funding was up $153 million (primarily due to the full quarter impact of the new debt), while average interest-bearing deposits were up $563 million (primarily money market deposits).

Nonaccrual loans were $174 million (0.97% of total loans) at March 31, 2015, compared to $177 million (1.01% of total loans) at December 31, 2014 (see Table 10). Potential problem loans increased to $219 million, up $28 million from the fourth quarter of 2014. The provision for credit losses for the first quarter of 2015 was $5 million, relatively unchanged from fourth quarter of 2014 (see Table 9). Annualized net charge offs represented 0.13% of average loans for the first quarter of 2015 compared to 0.10% for the fourth quarter of 2014. The allowance for loan losses to loans at March 31, 2015 was 1.48%, compared to 1.51% at December 31, 2014 (see Table 9). See discussion under sections, “Provision for Credit Losses,” “Allowance for Credit Losses,” and “Nonaccrual Loans, Potential Problem Loans, and Other Real Estate Owned.”

Noninterest income for the first quarter of 2015 increased $10 million (15%) to $80 million versus the fourth quarter of 2014. Core fee-based revenue increased $8 million (15%) from the fourth quarter of 2014, primarily due to a $9 million increase in insurance commissions. Insurance commissions increased from the fourth quarter of 2014, primarily due to the acquisition of Ahmann & Martin Co. See Note 2, "Acquisitions," of the notes to consolidated financial statements for additional information on the Ahmann & Martin Co. acquisition. Net mortgage banking income was $7 million, up $4 million from the fourth quarter of 2014, mainly due to a $4 million favorable change in the fair value of the mortgage derivatives. Net asset gains decreased $3 million, primarily due to lower gains on sales of real estate and miscellaneous assets.

On a sequential quarter basis, noninterest expense increased $2 million (1%) to $174 million. Personnel expense was $100 million for the first quarter of 2015, up $3 million (3%) from the fourth quarter of 2014 primarily attributable to the Ahmann & Martin Co. acquisition which added approximately 120 colleagues. Occupancy expense was up $3 million (21%), related to a lease termination charge, as the Corporation further consolidated office space in Chicago. The increases in personnel expense and occupancy expense were partially offset by a $3 million (38%) decrease in business development and advertising expenses from the fourth quarter of 2014, predominantly related to seasonal advertising during the fourth quarter of 2014. All remaining noninterest expense categories on a combined basis were relatively unchanged (down 1%) compared to the fourth quarter of 2014.

For the first quarter of 2015, the Corporation recognized income tax expense of $22 million, compared to income tax expense of $19 million for the fourth quarter of 2014. The effective tax rate was 32.49% and 27.79% for the first quarter of 2015 and the fourth quarter of 2014, respectively.

Segment Review

As discussed in Note 16, “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.

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. During 2015, certain organizational and methodology changes were made and, accordingly, 2014 results have been restated and presented on a comparable basis.

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Comparable Quarter Segment Review

The Corporate and Commercial Specialty segment consists of lending and deposit solutions to larger businesses, developers, non-profits, municipalities, and financial institutions, and the support to deliver, fund and manage such banking solutions. The Corporate and Commercial Specialty segment had net income of $29 million for the first quarter of 2015, up $5 million compared to $24 million for the comparable quarter in 2014. Segment revenue increased to $88 million for the first quarter of 2015 primarily due to growth in average loan balances, partially offset by lower spreads on loan products. The credit provision decreased to $10 million for the first quarter of 2015, due to improvement in loan credit quality. Average loan balances were $9.2 billion for the first quarter of 2015, up $368 million from an average balance of $8.8 billion for the first quarter of 2014. Average deposit balances were $5.4 billion for the first quarter of 2015, up $181 million from the comparable quarter of 2014. Average allocated capital increased to $943 million for the first quarter of 2015 reflecting the increase in the segment’s loan balances.

The Community, Consumer, and Business segment consists of lending and deposit solutions to individuals and small to mid-size businesses and also provides a variety of investment and fiduciary products and services. The Community, Consumer, and Business Banking segment had net income of $17 million for the first quarter of 2015 compared to $8 million in the comparable quarter of 2014. Segment revenue increased to $152 million for the first quarter of 2015 primarily due to higher insurance commissions from the Ahmann & Martin Co. acquisition as well as changes in the long-term funding rates utilized in the funds transfer pricing methodology for allocating interest credits. The credit provision for loans increased to $7 million for the first quarter of 2015, due to loan growth, partially offset by improving credit quality. Total noninterest expense increased to $119 million for the first quarter of 2015. Average loan balances were $8.5 billion for the first quarter of 2015, up $1.3 billion for the comparable quarter of 2014. Average deposits were $10.5 billion for the first quarter of 2015, up $983 million from average deposits of $9.5 billion for the comparable quarter of 2014. Average allocated capital increased to $647 million for the first quarter of 2015.

The Risk Management and Shared Services segment had net income of $1 million for the first quarter of 2015, down $12 million compared to $13 million for the comparable quarter in 2014. The decrease was primarily due to a $13 million decrease in net interest income related to changes in the long-term funding rates utilized in the funds transfer pricing methodology for allocating interest credits to the Corporate and Commercial Specialty and Community, Consumer and Business segments. Average earning asset balances increased $593 million compared to the first quarter of 2014, primarily in investment securities. Average deposits were $3.1 billion for the first quarter of 2015, up $902 million versus the comparable quarter of 2014. Average allocated capital decreased to $214 million in the first quarter of 2015.

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.

The consolidated financial statements of the Corporation are prepared in conformity with U.S. generally accepted accounting principles and follow general practices within the industries in which it operates. This preparation requires management to make estimates, assumptions, and judgments that affect the amounts reported in the financial statements and accompanying notes. These estimates, assumptions, and judgments are based on information available as of the date of the financial statements; accordingly, as this information changes, actual results could differ from the estimates, assumptions, and judgments reflected in the financial statements. Certain policies inherently have a greater reliance on the use of estimates, assumptions, and judgments and, as such, have a greater possibility of producing results that could be materially different than originally reported. Management believes the following policies are both important to the portrayal of the Corporation’s financial condition and results of operations and require subjective or complex judgments and, therefore, management considers the following to be critical accounting policies. The critical accounting policies are discussed directly with the Audit Committee of the Corporation’s Board of Directors.

Allowance for Loan Losses: Management’s evaluation process used to determine the appropriateness of the allowance for loan losses is subject to the use of estimates, assumptions, and judgments. The evaluation process combines many factors: management’s ongoing review and grading of the loan portfolio, consideration of historical loan loss and delinquency experience, trends in past due and nonaccrual loans, risk characteristics of the various classifications of loans, 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 probable credit losses. Because current economic conditions can change and future events are inherently difficult to predict, the anticipated amount of estimated loan losses, and therefore the appropriateness of the allowance for loan losses, could change significantly. As an integral part of their examination process, various regulatory agencies also review the allowance for loan losses. Such agencies may require additions to the allowance for loan losses or may require that certain loan balances be charged off or downgraded into criticized loan categories when their credit evaluations differ from those of management, based

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on their judgments about information available to them at the time of their examination. The Corporation believes the level of the allowance for loan losses is appropriate as recorded in the consolidated financial statements. See Note 7, “Loans, Allowance for Credit Losses, and Credit Quality,” of the notes to consolidated financial statements and section “Allowance for Credit Losses.”

Goodwill Impairment Assessment: 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 Corporation conducted its most recent annual impairment testing in May 2014, 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 increases in both the Corporation’s common stock price and in the overall bank common stock index (based on the NASDAQ Bank index), as well as the Corporation’s earnings per common share trend over the past year. Based on these assessments, management concluded that the 2014 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 date of the last impairment testing that have changed the Corporation's impairment assessment conclusion. See also Note 8, “Goodwill and Other Intangible Assets,” of the notes to consolidated financial statements.

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, similar to 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 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, 2015 (holding all other factors unchanged), if refinance interest rates were to decrease 50 basis points (bp), the estimated value of the mortgage servicing rights asset would have been approximately $10 million (or 16%) lower. Conversely, if refinance interest 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 $1 million at March 31, 2015. The potential recovery 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 rights 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.”

Income Taxes: The assessment of tax assets and liabilities involves the use of estimates, assumptions, interpretations, and judgment concerning certain accounting pronouncements and federal and state tax codes and regulations. There can be no assurance that future events, such as court decisions or positions of federal and state taxing authorities, will not differ from management’s current assessment, the impact of which could be significant to the consolidated results of operations and reported earnings. Quarterly assessments are performed to determine if valuation allowances are necessary against any portion of the Corporation’s deferred tax assets. Assessing the need for, or sufficiency of, a valuation allowance requires management to evaluate all available evidence, both positive and negative, including the recent trend of quarterly earnings. Positive evidence necessary to overcome the negative evidence includes whether future taxable income in sufficient amounts and character within the carryback and carryforward periods is available under the tax law, including the use of tax planning strategies. When negative evidence (e.g., cumulative losses in recent years, history of operating loss or tax credit carryforwards expiring unused) exists, more positive evidence than negative evidence will be necessary. The Corporation has concluded that based on the level of positive evidence, it is more likely than not that the deferred tax asset will be realized. However, there is no guarantee that the tax benefits associated with the deferred tax assets will be fully realized. The Corporation believes the tax assets and liabilities are properly recorded in the consolidated

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financial statements. See also Note 10, “Income Taxes,” of the notes to consolidated financial statements and section “Income Taxes.”

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 the consolidated financial statements.

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 is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2015. Entities may apply the amendment prospectively or retrospectively to all prior periods presented in the financial statements. Early adoption is permitted. The Corporation intends to adopt the accounting standard during the first quarter of 2016, as required, and is currently evaluating the impact on its results of operations, financial position, and liquidity.

In April 2015, the FASB issued an amendment to simplify the presentation of debt issuance costs. The amendments in this update require 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. This amendment is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Entities should apply the amendment retrospectively to all prior periods presented in the financial statements. Early adoption is permitted. The Corporation intends to adopt the accounting standard during the first quarter of 2016, as required, and is currently evaluating the impact on its results of operations, financial position, and liquidity.

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 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Entities may apply the amendment using a modified retrospective approach or retrospectively to all prior periods presented in the financial statements. Early adoption is permitted, including adoption in an interim period. The Corporation intends to adopt the accounting standard during the first quarter of 2016, as required, and is currently evaluating the impact on its results of operations, financial position, and 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 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Entities may apply the amendment prospectively or retrospectively to all prior periods presented in the financial statements. Early adoption is permitted provided that the guidance is applied from the beginning of the fiscal year of adoption. The Corporation intends to adopt the accounting standard during the first quarter of 2016, as required, with no material impact as no retrospective adjustments are anticipated.

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 is effective for annual reporting periods, including interim periods within those annual periods, beginning after December 15, 2015. Early adoption is permitted. Entities may apply the amendments in this update either (a) prospectively to all awards granted or modified after the effective date or (b) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The Corporation intends to adopt the accounting standard during the first quarter of 2016, as required, with no material impact on its results of operations, financial position, and liquidity.

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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. The amendment is effective for annual reporting periods beginning after December 15, 2016 (including interim reporting periods within those periods); however, the FASB has issued a proposal to defer the effective date for one year. Early application is not permitted. The Corporation intends to adopt the accounting standard, as required, and is currently evaluating the impact on its results of operations, financial position, and liquidity.

Recent Developments

On April 21, 2015, the Board of Directors declared a regular quarterly cash dividend of $0.10 per common share, payable on June 15, 2015, to shareholders of record at the close of business on June 1, 2015. 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 Perpetual Preferred Stock payable on June 15, 2015, to shareholders of record at the close of business on June 1, 2015. These cash dividends have not been reflected in the accompanying consolidated financial statements.

On April 21, 2015, the Board of Directors authorized the repurchase of up to $125 million of the Corporation’s common stock. This repurchase authorization is in addition to the previously authorized common stock repurchase program announced on October 28, 2014. There remains approximately $46 million under the previous authorization, or approximately $171 million in the aggregate. Repurchases under such programs are subject to regulatory limitations and may occur from time to time in open market purchases, block transactions, accelerated share repurchase programs or similar facilities.

ITEM 3. Quantitative and 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, 2015, 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 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, 2015. 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.

PART II – OTHER INFORMATION

ITEM 1. Legal Proceedings

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 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

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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.

The U.S. Department of Housing and Urban Development (“HUD”) is investigating the Bank’s compliance with fair housing laws, particularly from the period 2008 to 2011. There are several possible outcomes from this matter, including administrative or court proceedings, or a conciliation agreement with HUD. The Corporation believes it has been in compliance in all material respects with all applicable laws and regulations related to fair housing. 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 investigation by HUD.

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.

Debt protection and identity protection products have recently received increased regulatory scrutiny, and it is possible that regulatory authorities could bring enforcement actions, including civil money penalties, or take other actions against the Corporation in regard to these legacy 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 this matter.

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

Following are the Corporation’s monthly common stock purchases during the first quarter of 2015. For a detailed discussion of the common stock repurchase authorizations and repurchases during the period, see section “Capital” included under Part I Item 2 of this document.

Period	Total Number of Shares Purchased (a)	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans	Maximum Number of Shares that May Yet Be Purchased Under the Plan (b)
January 1, 2015 - January 31, 2015	1,203,400	$	17.13	1,203,400	—
February 1, 2015 - February 28, 2015	533,301	17.60		533,301	—
March 1, 2015 - March 31, 2015	—	—		—	—
Total	1,736,701	$	17.27	1,736,701	2,467,850

(a) During the first quarter of 2015, the Corporation repurchased approximately 235,000 common shares for minimum tax withholding settlements on equity compensation. These purchases are not included in the monthly common stock purchases table above and do not count against the maximum number of shares that may yet be purchased under the Board of Directors’ authorization.

(b) On October 28, 2014, the Board of Directors authorized the repurchase of up to $120 million of common stock, of which approximately $46 million remained available to repurchase as of March 31, 2015. Using the closing stock price on March 31, 2015 of $18.60, a total of approximately 2.5 million shares of common stock remained available to be repurchased under the previously approved Board authorizations as of March 31, 2015. On April 21, 2015, the Board of Directors authorized the repurchase of up to $125 million of the Corporation's common stock. This repurchase authorization is in addition to the $46 million remaining under the October 28, 2014 repurchase authorization, or approximately $171 million aggregate. See section, "Recent Developments," for additional information on the April 21, 2015, repurchase authorization.

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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: May 1, 2015	/s/ Philip B. Flynn
	Philip B. Flynn
	President and Chief Executive Officer
Date: May 1, 2015	/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: May 1, 2015	/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: May 1, 2015	/s/ Christopher J. Del Moral-Niles
	Christopher J. Del Moral-Niles
	Chief Financial Officer and Principal Accounting 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, 2015 (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

May 1, 2015

/s/ Christopher J. Del Moral-Niles

Christopher J. Del Moral-Niles

Chief Financial Officer

May 1, 2015

XML

Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2015

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

Summary of activity in accumulated other comprehensive income (loss)

($ in Thousands)	Investments Securities Available For Sale			Defined Benefit Pension and Post Retirement Obligations			Accumulated Other Comprehensive Income (Loss)
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	—			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
Balance January 1, 2014	$	(11,396	)	$	(12,848	)	$	(24,244	)
Other comprehensive income before reclassifications	20,627			—			20,627
Amounts reclassified from accumulated other comprehensive income (loss)	(378		)	331			(47		)
Income tax expense	(7,786		)	(127		)	(7,913		)
Net other comprehensive income during period	12,463			204			12,667
Balance March 31, 2014	$	1,067		$	(12,644	)	$	(11,577	)

XML

Loans, Allowance for Credit Losses, and Credit Quality Consumer Loans by Credit Quality Indicator (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Consumer Loans by credit quality indicator [Abstract]
Home equity	$ 1,583,614	$ 1,636,058
Installment and credit cards	436,492	454,219
Residential mortgage	4,658,574	4,472,760
Total consumer	6,678,680	6,563,037
Performing Financing Receivable [Member]
Consumer Loans by credit quality indicator [Abstract]
Home equity	1,542,482	1,592,788
Installment and credit cards	433,268	450,698
Residential mortgage	4,581,063	4,397,271
Total consumer	6,556,813	6,440,757
30 To 89 Days Past Due [Member]
Consumer Loans by credit quality indicator [Abstract]
Home equity	10,008	10,583
Installment and credit cards	1,818	1,932
Residential mortgage	3,403	3,046
Total consumer	15,229	15,561
Potential Problem [Member]
Consumer Loans by credit quality indicator [Abstract]
Home equity	958	880
Installment and credit cards	0	2
Residential mortgage	6,621	3,781
Total consumer	7,579	4,663
Impaired [Member]
Consumer Loans by credit quality indicator [Abstract]
Home equity	30,166	31,807
Installment and credit cards	1,406	1,587
Residential mortgage	67,487	68,662
Total consumer	$ 99,059	$ 102,056

XML

Investment Securities AFS and HTM Gross Unrealized Losses (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
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	$ (910)	$ (3,189)
Unrealized losses on available for sale securities, 12 months or more	(25,436)	(53,343)
Total unrealized losses on available for sale securities	(26,346)	(56,532)
Fair value of unrealized losses on available for sale securities, less than 12 months	305,776	669,839
Fair value of unrealized losses on available for sale securities, 12 months or more	1,516,536	1,719,118
Total fair value of unrealized losses on available for sale securities	1,822,312	2,388,957
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	(568)	(216)
Unrealized losses on held to maturity securities, 12 months or more	(264)	(616)
Total unrealized losses on held to maturity securities	(832)	(832)
Fair value of unrealized losses on held to maturity securities, less than 12 months	73,163	31,924
Fair value of unrealized losses on held to maturity securities, 12 months or more	9,552	38,915
Total fair value of unrealized losses on held to maturity securities	82,715	70,839
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		(1)
Unrealized losses on available for sale securities, 12 months or more		0
Total unrealized losses on available for sale securities		(1)
Fair value of unrealized losses on available for sale securities, less than 12 months		998
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		998
Number of available for sale securities in a continuous unrealized loss position less than twelve months		1
Number of available for sale securities in a continuous unrealized loss position for twelve months or more		0
Obligations of state and political subdivisions (municipal 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)	(9)
Unrealized losses on available for sale securities, 12 months or more	(3)	(20)
Total unrealized losses on available for sale securities	(4)	(29)
Fair value of unrealized losses on available for sale securities, less than 12 months	629	3,374
Fair value of unrealized losses on available for sale securities, 12 months or more	186	2,133
Total fair value of unrealized losses on available for sale securities	815	5,507
Number of available for sale securities in a continuous unrealized loss position less than twelve months	2	6
Number of available for sale securities in a continuous unrealized loss position for twelve months or more	1	6
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Unrealized losses on held to maturity securities, less than 12 months	(568)	(216)
Unrealized losses on held to maturity securities, 12 months or more	(264)	(616)
Total unrealized losses on held to maturity securities	(832)	(832)
Fair value of unrealized losses on held to maturity securities, less than 12 months	73,163	31,924
Fair value of unrealized losses on held to maturity securities, 12 months or more	9,552	38,915
Total fair value of unrealized losses on held to maturity securities	82,715	70,839
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	163	74
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	21	85
Government-Sponsored Enterprise (GSE) [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	(805)	(1,404)
Unrealized losses on available for sale securities, 12 months or more	(10,452)	(29,146)
Total unrealized losses on available for sale securities	(11,257)	(30,550)
Fair value of unrealized losses on available for sale securities, less than 12 months	204,345	333,713
Fair value of unrealized losses on available for sale securities, 12 months or more	1,060,452	1,256,533
Total fair value of unrealized losses on available for sale securities	1,264,797	1,590,246
Number of available for sale securities in a continuous unrealized loss position less than twelve months	22	16
Number of available for sale securities in a continuous unrealized loss position for twelve months or more	43	56
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	(9)	(9)
Unrealized losses on available for sale securities, 12 months or more	(1)	(1)
Total unrealized losses on available for sale securities	(10)	(10)
Fair value of unrealized losses on available for sale securities, less than 12 months	1,750	1,772
Fair value of unrealized losses on available for sale securities, 12 months or more	24	27
Total fair value of unrealized losses on available for sale securities	1,774	1,799
Number of available for sale securities in a continuous unrealized loss position less than twelve months	1	1
Number of available for sale securities in a continuous unrealized loss position for twelve months or more	2	2
GSE 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	(95)	(1,766)
Unrealized losses on available for sale securities, 12 months or more	(14,980)	(24,176)
Total unrealized losses on available for sale securities	(15,075)	(25,942)
Fair value of unrealized losses on available for sale securities, less than 12 months	99,052	329,982
Fair value of unrealized losses on available for sale securities, 12 months or more	455,874	460,425
Total fair value of unrealized losses on available for sale securities	$ 554,926	$ 790,407
Number of available for sale securities in a continuous unrealized loss position less than twelve months	4	9
Number of available for sale securities in a continuous unrealized loss position for twelve months or more	20	20

XML

Derivative and Hedging Activities Derivative Instruments Not Designated as Hedging Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Fair Value	$ 38,990	$ 33,023
Trading Assets [Member] | Interest Rate Related Instruments Customer and Mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	1,655,749	1,636,480
Fair Value	38,990	33,023
Receive Rate	1.50%	1.60%
Pay Rate	1.50%	1.60%
Maturity	41 months	42 months
Trading Assets [Member] | Foreign Currency Exchange Forward [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	88,834	60,742
Fair Value	3,346	2,140
Trading Liabilities [Member] | Interest Rate Related Instruments Customer and Mirror [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	1,655,749	1,636,480
Fair Value	(41,633)	(35,372)
Receive Rate	1.50%	1.60%
Pay Rate	1.50%	1.60%
Maturity	41 months	42 months
Trading Liabilities [Member] | Foreign Currency Exchange Forward [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	79,934	56,573
Fair Value	(3,097)	(1,957)
Other Assets [Member] | Interest Rate Lock Commitments (mortgage) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	207,110	126,379
Fair Value	3,685	1,947
Other Assets [Member] | Purchased deposit option [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	109,510	110,347
Fair Value	6,111	6,054
Other Liabilities [Member] | Forward Commitments (mortgage) [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	309,275	234,500
Fair Value	(1,795)	(2,435)
Other Liabilities [Member] | Written deposit option [Member]
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional Amount	109,510	110,347
Fair Value	$ (6,111)	$ (6,054)

XML

Loans, Allowance for Credit Losses, and Credit Quality Loans by Past Due Status (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Summarized details of Loans
30-59 Days Past Due	$ 32,588,000	$ 39,373,000
60-89 Days Past Due	11,952,000	22,705,000
90 Days or More Past Due	54,337,000	64,922,000
Total Past Due	98,877,000	127,000,000
Current	17,880,155,000	17,466,846,000
Total loans	17,979,032,000	17,593,846,000
Accruing loans past due 90 days or more	2,000,000	2,000,000
Percent of current nonaccrual loans	57.00%	54.00%
Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
30-59 Days Past Due	7,109,000	5,338,000
60-89 Days Past Due	3,851,000	10,908,000
90 Days or More Past Due	10,132,000	10,408,000
Total Past Due	21,092,000	26,654,000
Current	6,119,328,000	5,879,248,000
Total loans	6,140,420,000	5,905,902,000
Commercial Real Estate Owner Occupied Portfolio [Member]
Summarized details of Loans
30-59 Days Past Due	4,124,000	11,626,000
60-89 Days Past Due	185,000	2,240,000
90 Days or More Past Due	8,644,000	8,596,000
Total Past Due	12,953,000	22,462,000
Current	990,932,000	985,475,000
Total loans	1,003,885,000	1,007,937,000
Finance Leases Financing Receivable [Member]
Summarized details of Loans
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
90 Days or More Past Due	513,000	513,000
Total Past Due	513,000	513,000
Current	48,983,000	51,016,000
Total loans	49,496,000	51,529,000
Commercial And Business Lending [Member]
Summarized details of Loans
30-59 Days Past Due	11,233,000	16,964,000
60-89 Days Past Due	4,036,000	13,148,000
90 Days or More Past Due	19,289,000	19,517,000
Total Past Due	34,558,000	49,629,000
Current	7,159,243,000	6,915,739,000
Total loans	7,193,801,000	6,965,368,000
Commercial Real Estate Investor Portfolio Segment [Member]
Summarized details of Loans
30-59 Days Past Due	1,942,000	2,569,000
60-89 Days Past Due	448,000	955,000
90 Days or More Past Due	5,395,000	12,765,000
Total Past Due	7,785,000	16,289,000
Current	3,079,195,000	3,040,196,000
Total loans	3,086,980,000	3,056,485,000
Commercial Real Estate Construction Financing Receivable [Member]
Summarized details of Loans
30-59 Days Past Due	1,667,000	1,038,000
60-89 Days Past Due	173,000	106,000
90 Days or More Past Due	872,000	798,000
Total Past Due	2,712,000	1,942,000
Current	1,016,859,000	1,007,014,000
Total loans	1,019,571,000	1,008,956,000
Commercial Real Estate Lending [Member]
Summarized details of Loans
30-59 Days Past Due	3,609,000	3,607,000
60-89 Days Past Due	621,000	1,061,000
90 Days or More Past Due	6,267,000	13,563,000
Total Past Due	10,497,000	18,231,000
Current	4,096,054,000	4,047,210,000
Total loans	4,106,551,000	4,065,441,000
Commercial Financing Receivable [Member]
Summarized details of Loans
30-59 Days Past Due	14,842,000	20,571,000
60-89 Days Past Due	4,657,000	14,209,000
90 Days or More Past Due	25,556,000	33,080,000
Total Past Due	45,055,000	67,860,000
Current	11,255,297,000	10,962,949,000
Total loans	11,300,352,000	11,030,809,000
Home Equity [Member]
Summarized details of Loans
30-59 Days Past Due	9,955,000	9,652,000
60-89 Days Past Due	3,200,000	4,852,000
90 Days or More Past Due	9,663,000	10,654,000
Total Past Due	22,818,000	25,158,000
Current	1,560,796,000	1,610,900,000
Total loans	1,583,614,000	1,636,058,000
Installment and Credit Cards [Member]
Summarized details of Loans
30-59 Days Past Due	1,213,000	1,282,000
60-89 Days Past Due	673,000	785,000
90 Days or More Past Due	1,587,000	1,458,000
Total Past Due	3,473,000	3,525,000
Current	433,019,000	450,694,000
Total loans	436,492,000	454,219,000
Residential, Prime, Financing Receivable [Member]
Summarized details of Loans
30-59 Days Past Due	6,578,000	7,868,000
60-89 Days Past Due	3,422,000	2,859,000
90 Days or More Past Due	17,531,000	19,730,000
Total Past Due	27,531,000	30,457,000
Current	4,631,043,000	4,442,303,000
Total loans	4,658,574,000	4,472,760,000
Consumer Loan [Member]
Summarized details of Loans
30-59 Days Past Due	17,746,000	18,802,000
60-89 Days Past Due	7,295,000	8,496,000
90 Days or More Past Due	28,781,000	31,842,000
Total Past Due	53,822,000	59,140,000
Current	6,624,858,000	6,503,897,000
Total loans	6,678,680,000	6,563,037,000
Accruing Loans [Member]
Summarized details of Loans
30-59 Days Past Due	18,333,000	26,621,000
60-89 Days Past Due	2,994,000	16,507,000
90 Days or More Past Due	1,715,000	1,623,000
Total Past Due	23,042,000	44,751,000
Current	17,781,644,000	17,371,682,000
Total loans	17,804,686,000	17,416,433,000
Accruing Loans [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
30-59 Days Past Due	1,281,000	4,466,000
60-89 Days Past Due	436,000	10,281,000
90 Days or More Past Due	197,000	254,000
Total Past Due	1,914,000	15,001,000
Current	6,076,886,000	5,841,238,000
Total loans	6,078,800,000	5,856,239,000
Accruing Loans [Member] | Commercial Real Estate Owner Occupied Portfolio [Member]
Summarized details of Loans
30-59 Days Past Due	1,849,000	8,429,000
60-89 Days Past Due	0	2,199,000
90 Days or More Past Due	0	0
Total Past Due	1,849,000	10,628,000
Current	980,175,000	971,484,000
Total loans	982,024,000	982,112,000
Accruing Loans [Member] | Finance Leases Financing Receivable [Member]
Summarized details of Loans
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
90 Days or More Past Due	0	0
Total Past Due	0	0
Current	47,776,000	49,728,000
Total loans	47,776,000	49,728,000
Accruing Loans [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
30-59 Days Past Due	3,130,000	12,895,000
60-89 Days Past Due	436,000	12,480,000
90 Days or More Past Due	197,000	254,000
Total Past Due	3,763,000	25,629,000
Current	7,104,837,000	6,862,450,000
Total loans	7,108,600,000	6,888,079,000
Accruing Loans [Member] | Commercial Real Estate Investor Portfolio Segment [Member]
Summarized details of Loans
30-59 Days Past Due	1,767,000	712,000
60-89 Days Past Due	448,000	496,000
90 Days or More Past Due	0	0
Total Past Due	2,215,000	1,208,000
Current	3,071,023,000	3,032,592,000
Total loans	3,073,238,000	3,033,800,000
Accruing Loans [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Summarized details of Loans
30-59 Days Past Due	317,000	951,000
60-89 Days Past Due	0	33,000
90 Days or More Past Due	0	0
Total Past Due	317,000	984,000
Current	1,013,831,000	1,002,573,000
Total loans	1,014,148,000	1,003,557,000
Accruing Loans [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
30-59 Days Past Due	2,084,000	1,663,000
60-89 Days Past Due	448,000	529,000
90 Days or More Past Due	0	0
Total Past Due	2,532,000	2,192,000
Current	4,084,854,000	4,035,165,000
Total loans	4,087,386,000	4,037,357,000
Accruing Loans [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
30-59 Days Past Due	5,214,000	14,558,000
60-89 Days Past Due	884,000	13,009,000
90 Days or More Past Due	197,000	254,000
Total Past Due	6,295,000	27,821,000
Current	11,189,691,000	10,897,615,000
Total loans	11,195,986,000	10,925,436,000
Accruing Loans [Member] | Home Equity [Member]
Summarized details of Loans
30-59 Days Past Due	8,637,000	8,037,000
60-89 Days Past Due	1,371,000	2,546,000
90 Days or More Past Due	85,000	52,000
Total Past Due	10,093,000	10,635,000
Current	1,553,094,000	1,603,682,000
Total loans	1,563,187,000	1,614,317,000
Accruing Loans [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
30-59 Days Past Due	1,180,000	1,186,000
60-89 Days Past Due	638,000	746,000
90 Days or More Past Due	1,433,000	1,317,000
Total Past Due	3,251,000	3,249,000
Current	432,726,000	450,357,000
Total loans	435,977,000	453,606,000
Accruing Loans [Member] | Residential, Prime, Financing Receivable [Member]
Summarized details of Loans
30-59 Days Past Due	3,302,000	2,840,000
60-89 Days Past Due	101,000	206,000
90 Days or More Past Due	0	0
Total Past Due	3,403,000	3,046,000
Current	4,606,133,000	4,420,028,000
Total loans	4,609,536,000	4,423,074,000
Accruing Loans [Member] | Consumer Loan [Member]
Summarized details of Loans
30-59 Days Past Due	13,119,000	12,063,000
60-89 Days Past Due	2,110,000	3,498,000
90 Days or More Past Due	1,518,000	1,369,000
Total Past Due	16,747,000	16,930,000
Current	6,591,953,000	6,474,067,000
Total loans	6,608,700,000	6,490,997,000
Nonaccrual Loan [Member]
Summarized details of Loans
30-59 Days Past Due	14,255,000	12,752,000
60-89 Days Past Due	8,958,000	6,198,000
90 Days or More Past Due	52,622,000	63,299,000
Total Past Due	75,835,000	82,249,000
Current	98,511,000	95,164,000
Total loans	174,346,000	177,413,000
Nonaccrual Loan [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
30-59 Days Past Due	5,828,000	872,000
60-89 Days Past Due	3,415,000	627,000
90 Days or More Past Due	9,935,000	10,154,000
Total Past Due	19,178,000	11,653,000
Current	42,442,000	38,010,000
Total loans	61,620,000	49,663,000
Nonaccrual Loan [Member] | Commercial Real Estate Owner Occupied Portfolio [Member]
Summarized details of Loans
30-59 Days Past Due	2,275,000	3,197,000
60-89 Days Past Due	185,000	41,000
90 Days or More Past Due	8,644,000	8,596,000
Total Past Due	11,104,000	11,834,000
Current	10,757,000	13,991,000
Total loans	21,861,000	25,825,000
Nonaccrual Loan [Member] | Finance Leases Financing Receivable [Member]
Summarized details of Loans
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
90 Days or More Past Due	513,000	513,000
Total Past Due	513,000	513,000
Current	1,207,000	1,288,000
Total loans	1,720,000	1,801,000
Nonaccrual Loan [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
30-59 Days Past Due	8,103,000	4,069,000
60-89 Days Past Due	3,600,000	668,000
90 Days or More Past Due	19,092,000	19,263,000
Total Past Due	30,795,000	24,000,000
Current	54,406,000	53,289,000
Total loans	85,201,000	77,289,000
Nonaccrual Loan [Member] | Commercial Real Estate Investor Portfolio Segment [Member]
Summarized details of Loans
30-59 Days Past Due	175,000	1,857,000
60-89 Days Past Due	0	459,000
90 Days or More Past Due	5,395,000	12,765,000
Total Past Due	5,570,000	15,081,000
Current	8,172,000	7,604,000
Total loans	13,742,000	22,685,000
Nonaccrual Loan [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Summarized details of Loans
30-59 Days Past Due	1,350,000	87,000
60-89 Days Past Due	173,000	73,000
90 Days or More Past Due	872,000	798,000
Total Past Due	2,395,000	958,000
Current	3,028,000	4,441,000
Total loans	5,423,000	5,399,000
Nonaccrual Loan [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
30-59 Days Past Due	1,525,000	1,944,000
60-89 Days Past Due	173,000	532,000
90 Days or More Past Due	6,267,000	13,563,000
Total Past Due	7,965,000	16,039,000
Current	11,200,000	12,045,000
Total loans	19,165,000	28,084,000
Nonaccrual Loan [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
30-59 Days Past Due	9,628,000	6,013,000
60-89 Days Past Due	3,773,000	1,200,000
90 Days or More Past Due	25,359,000	32,826,000
Total Past Due	38,760,000	40,039,000
Current	65,606,000	65,334,000
Total loans	104,366,000	105,373,000
Nonaccrual Loan [Member] | Home Equity [Member]
Summarized details of Loans
30-59 Days Past Due	1,318,000	1,615,000
60-89 Days Past Due	1,829,000	2,306,000
90 Days or More Past Due	9,578,000	10,602,000
Total Past Due	12,725,000	14,523,000
Current	7,702,000	7,218,000
Total loans	20,427,000	21,741,000
Nonaccrual Loan [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
30-59 Days Past Due	33,000	96,000
60-89 Days Past Due	35,000	39,000
90 Days or More Past Due	154,000	141,000
Total Past Due	222,000	276,000
Current	293,000	337,000
Total loans	515,000	613,000
Nonaccrual Loan [Member] | Residential, Prime, Financing Receivable [Member]
Summarized details of Loans
30-59 Days Past Due	3,276,000	5,028,000
60-89 Days Past Due	3,321,000	2,653,000
90 Days or More Past Due	17,531,000	19,730,000
Total Past Due	24,128,000	27,411,000
Current	24,910,000	22,275,000
Total loans	49,038,000	49,686,000
Nonaccrual Loan [Member] | Consumer Loan [Member]
Summarized details of Loans
30-59 Days Past Due	4,627,000	6,739,000
60-89 Days Past Due	5,185,000	4,998,000
90 Days or More Past Due	27,263,000	30,473,000
Total Past Due	37,075,000	42,210,000
Current	32,905,000	29,830,000
Total loans	$ 69,980,000	$ 72,040,000

XML

Fair Value Measurements Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Available-for-sale Securities [Member]
Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)
Beginning Balance	$ 200	$ 299
Total net gain (losses) included in income:
Sales of investment securities		(99)
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 gain (loss)	0	0
Derivatives [Member]
Total net gain (losses) included in income:
Sales of investment securities		0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	(488)	1,717
Fair Value, Net Derivative Asset (Liability Measure on Recurring Basis, Unobservable Input Reconciliation On Net Losses Included in Income [Abstract]
Mortgage derivative gain (loss)	2,378	(2,205)
Ending Balance	$ 1,890	$ (488)

XML

Investment Securities AFS and HTM Securities Amortized Cost and Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investment securities available for sale:
Amortized cost	$ 5,282,339	$ 5,368,259
Gross unrealized gains	102,317	85,085
Gross unrealized losses	(26,346)	(56,532)
Fair value	5,358,310	5,396,812
Investment securities held to maturity:
Amortized cost	438,047	404,455
Gross unrealized gains	9,482	9,444
Gross unrealized losses	(832)	(832)
Fair value	446,697	413,067
US Treasury Securities [Member]
Investment securities available for sale:
Amortized cost	999	999
Gross unrealized gains	3	0
Gross unrealized losses	0	(1)
Fair value	1,002	998
Obligations of state and political subdivisions (municipal securities) [Member]
Investment securities available for sale:
Amortized cost	501,679	560,839
Gross unrealized gains	22,912	21,869
Gross unrealized losses	(4)	(29)
Fair value	524,587	582,679
Investment securities held to maturity:
Amortized cost	438,047	404,455
Gross unrealized gains	9,482	9,444
Gross unrealized losses	(832)	(832)
Fair value	446,697	413,067
Government-Sponsored Enterprise (GSE) [Member]
Investment securities available for sale:
Amortized cost	3,613,144	3,700,103
Gross unrealized gains	73,227	61,236
Gross unrealized losses	(11,257)	(30,550)
Fair value	3,675,114	3,730,789
Private Label [Member]
Investment securities available for sale:
Amortized cost	1,962	2,297
Gross unrealized gains	1	7
Gross unrealized losses	(10)	(10)
Fair value	1,953	2,294
GSE commercial mortgage-related securities [Member]
Investment securities available for sale:
Amortized cost	1,158,217	1,097,913
Gross unrealized gains	6,114	1,922
Gross unrealized losses	(15,075)	(25,942)
Fair value	1,149,256	1,073,893
Other Debt And Other Equity Securities [Member]
Investment securities available for sale:
Amortized cost	6,338	6,108
Gross unrealized gains	60	51
Gross unrealized losses	0	0
Fair value	$ 6,398	$ 6,159

XML

Derivative and Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

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

							Weighted Average
($ in Thousands)	Notional Amount		Fair Value			Balance Sheet Category	Receive Rate(1)	Pay Rate(1)	Maturity
March 31, 2015
Interest rate-related instruments — customer and mirror	$	1,655,749	$	38,990		Trading assets	1.50%	1.50%	41 months
Interest rate-related instruments — customer and mirror	1,655,749		(41,633		)	Trading liabilities	1.50%	1.50%	41 months
Interest rate lock commitments (mortgage)	207,110		3,685			Other assets	--	--	--
Forward commitments (mortgage)	309,275		(1,795		)	Other liabilities	--	--	--
Foreign currency exchange forwards	88,834		3,346			Trading assets	--	--	--
Foreign currency exchange forwards	79,934		(3,097		)	Trading liabilities	--	--	--
Purchased options (time deposit)	109,510		6,111			Other assets	--	--	--
Written options (time deposit)	109,510		(6,111		)	Other liabilities	--	--	--
December 31, 2014
Interest rate-related instruments — customer and mirror	$	1,636,480	$	33,023		Trading assets	1.60%	1.60%	42 months
Interest rate-related instruments — customer and mirror	1,636,480		(35,372		)	Trading liabilities	1.60%	1.60%	42 months
Interest rate lock commitments (mortgage)	126,379		1,947			Other assets	--	--	--
Forward commitments (mortgage)	234,500		(2,435		)	Other liabilities	--	--	--
Foreign currency exchange forwards	60,742		2,140			Trading assets	--	--	--
Foreign currency exchange forwards	56,573		(1,957		)	Trading liabilities	--	--	--
Purchased options (time deposit)	110,347		6,054			Other assets	--	--	--
Written options (time deposit)	110,347		(6,054		)	Other liabilities	--	--	--

⁽¹⁾  Reflects the weighted average receive rate and pay rate for the interest rate swap derivative financial instruments only.

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

	Income Statement Category of Gain /(Loss) Recognized in Income	Gain /(Loss) Recognized in Income
		($ in Thousands)
Three Months Ended March 31, 2015
Interest rate-related instruments — customer and mirror, net	Capital market fees, net	$	(294	)
Interest rate lock commitments (mortgage)	Mortgage banking, net	1,738
Forward commitments (mortgage)	Mortgage banking, net	640
Foreign currency exchange forwards	Capital market fees, net	66
Three Months Ended March 31, 2014
Interest rate-related instruments — customer and mirror, net	Capital market fees, net	$	70
Interest rate lock commitments (mortgage)	Mortgage banking, net	375
Forward commitments (mortgage)	Mortgage banking, net	(789		)
Foreign currency exchange forwards	Capital market fees, net	44

XML

Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	$ 161,662	$ 156,423
Mortgage servicing rights	59,733	60,145
Fair Value, Inputs, Level 1 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	0	0
Fair Value, Inputs, Level 2 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	161,662	156,423
Fair Value, Inputs, Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	0	0
Fair Value, Measurements, Nonrecurring [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	161,662	156,423
Impaired Loans	93,580	83,956
Mortgage servicing rights	64,026	66,342
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	0	0
Impaired Loans	0	0
Mortgage servicing rights	0	0
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	161,662	156,423
Impaired Loans	0	0
Mortgage servicing rights	0	0
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Non-recurring Basis
Loans held for sale	0	0
Impaired Loans	93,580	83,956
Mortgage servicing rights	$ 64,026	$ 66,342

XML

Balance Sheet Offsetting (Details) (Interest Rate Contract [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Interest Rate Contract [Member]
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 143	$ 558
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	143	558
Financial instruments	(143)	(558)
Collateral	0	0
Net amount	0	0
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	40,348	34,087
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	40,348	34,087
Financial instruments	(143)	(558)
Collateral	(30,481)	(26,105)
Net amount	$ 9,724	$ 7,424

XML

Loans, Allowance for Credit Losses, and Credit Quality Troubled Debt Restructurings Performing and Nonaccrual (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	$ 88,817	$ 98,216
Nonaccrual Restructured Loans	53,553	57,656
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	26,466	33,892
Nonaccrual Restructured Loans	6,631	3,260
Commercial Real Estate Owner Occupied Portfolio [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	9,780	10,454
Nonaccrual Restructured Loans	5,705	5,656
Commercial Real Estate Investor Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	22,775	23,127
Nonaccrual Restructured Loans	8,697	15,216
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	717	727
Nonaccrual Restructured Loans	2,349	2,438
Home Equity Port Folio Segments [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	9,739	10,066
Nonaccrual Restructured Loans	6,555	7,518
Installment and Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	891	974
Nonaccrual Restructured Loans	167	199
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Performing Restructured Loans	18,449	18,976
Nonaccrual Restructured Loans	$ 23,449	$ 23,369

XML

Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities (Details Textuals) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Carrying value of investments	$ 41,000,000	$ 27,000,000
Commitments under unconsolidated projects	28,000,000	28,000,000
Loans repurchased under make whole requests	800,000	5,000,000
Loss reimbursements under make whole requests	6,000	734,000
Loans sold to outside investors original amount	18,900,000,000
Loans sold to outside investors remaining outstanding amount	7,500,000,000
Residential mortgage loans sold with recourse risk	52,000,000	46,000,000
Residential mortgage loans sold with credit recourse risk	167,000,000	178,000,000
Mortgage Repurchase Reserve [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Commitments	2,481,000	3,258,000	5,737,000
Reserve for Off-balance Sheet Activities [Member]
Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Textuals) [Line Items]
Commitments	$ 24,900,000	$ 24,900,000	$ 21,900,000

XML

Fair Value Measurements (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value Measurements (Textuals) [Abstract]
Other real estate owned measured at fair value	$ 2	$ 21
Write down of Other Real Estate Owned		2
Commitment on standby letters of credit	$ 334	$ 353
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage derivative interest rate lock commitments closing ratio	86.00%
Mortgage servicing rights (MSR) weighted average constant prepayment rate	15.00%
Weighted average discount rate	9.60%
Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Weighted average discount rate	30.00%
Minimum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Weighted average discount rate	20.00%

XML

Fair Value Measurements Asset and Liabilities Measured at Fair Value on a Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investment securities available for sale:
Investment securities available for sale, at fair value	$ 5,358,310	$ 5,396,812
Trading assets	42,336	35,163
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	44,730	37,329
Fair Value, Measurements, Recurring [Member]
Investment securities available for sale:
Trading assets	52,132	43,164
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	52,636	45,818
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	1,002	998
Fair Value, Measurements, Recurring [Member] | Obligations of state and political subdivisions (municipal securities) [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	524,587	582,679
Fair Value, Measurements, Recurring [Member] | Government-Sponsored Enterprise (GSE) [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	3,675,114	3,730,789
Fair Value, Measurements, Recurring [Member] | Private Label [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	1,953	2,294
Fair Value, Measurements, Recurring [Member] | GSE commercial mortgage-related securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	1,149,256	1,073,893
Fair Value, Measurements, Recurring [Member] | Other Debt And Other Equity Securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	6,398	6,159
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	4,200	3,957
Trading assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	0	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, at fair value	1,002	998
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Obligations of state and political subdivisions (municipal securities) [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Government-Sponsored Enterprise (GSE) [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Private Label [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | GSE commercial mortgage-related securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
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, at fair value	3,198	2,959
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	5,353,910	5,392,655
Trading assets	48,447	41,217
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	50,841	43,383
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Obligations of state and political subdivisions (municipal securities) [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	524,587	582,679
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, at fair value	3,675,114	3,730,789
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Private Label [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	1,953	2,294
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | GSE commercial mortgage-related securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	1,149,256	1,073,893
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, at fair value	3,000	3,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	200	200
Trading assets	3,685	1,947
Liabilities, Fair Value Disclosure [Abstract]
Trading liabilities	1,795	2,435
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Obligations of state and political subdivisions (municipal securities) [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Government-Sponsored Enterprise (GSE) [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Private Label [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | GSE commercial mortgage-related securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Debt And Other Equity Securities [Member]
Investment securities available for sale:
Investment securities available for sale, at fair value	$ 200	$ 200

XML

Derivative and Hedging Activities Gains and Losses on Derivative Instruments Not Designated at Hedging Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Capital Market Fees, Net [Member] | Interest Rate Related Instruments Customer and Mirror [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain /(Loss) Recognized in Income	$ (294)	$ 70
Capital Market Fees, Net [Member] | Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain /(Loss) Recognized in Income	66	44
Mortgage Banking, Net [Member] | Interest Rate Lock Commitments (mortgage) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain /(Loss) Recognized in Income	1,738	375
Mortgage Banking, Net [Member] | Forward Contracts (mortgage) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain /(Loss) Recognized in Income	$ 640	$ (789)

XML

Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2015

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, 2015 and 2014, changes during the three month periods then ended, and reclassifications out of accumulated other comprehensive income during the three month periods ended March 31, 2015 and 2014, respectively. The amounts reclassified from accumulated other comprehensive income for the investment securities available for sale are included in investment securities gains, net on the consolidated statements of income, while the amounts reclassified from accumulated other comprehensive income for the defined benefit pension and post retirement obligations are a component of personnel expense on the consolidated statements of income.

($ in Thousands)	Investments Securities Available For Sale			Defined Benefit Pension and Post Retirement Obligations			Accumulated Other Comprehensive Income (Loss)
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	—			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
Balance January 1, 2014	$	(11,396	)	$	(12,848	)	$	(24,244	)
Other comprehensive income before reclassifications	20,627			—			20,627
Amounts reclassified from accumulated other comprehensive income (loss)	(378		)	331			(47		)
Income tax expense	(7,786		)	(127		)	(7,913		)
Net other comprehensive income during period	12,463			204			12,667
Balance March 31, 2014	$	1,067		$	(12,644	)	$	(11,577	)

XML

Loans, Allowance for Credit Losses, and Credit Quality Loan Composition (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Loan composition
Commercial and industrial	$ 6,140,420	$ 5,905,902
Commercial real estate - owner occupied	1,003,885	1,007,937
Lease financing	49,496	51,529
Commercial and business lending	7,193,801	6,965,368
Commercial real estate - investor	3,086,980	3,056,485
Real estate construction	1,019,571	1,008,956
Commercial real estate lending	4,106,551	4,065,441
Total commercial	11,300,352	11,030,809
Home equity	1,583,614	1,636,058
Installment and credit cards	436,492	454,219
Residential mortgage	4,658,574	4,472,760
Total consumer	6,678,680	6,563,037
Total loans	$ 17,979,032	$ 17,593,846

XML

Stock-Based Compensation Stock Option Activity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair value assumptions of stock options
Dividend yield	2.00%	2.00%
Risk-free interest rate	2.00%	2.00%
Weighted average expected volatility	20.00%	20.00%
Weighted average expected life	6 years	6 years
Weighted average per share fair value of options	$ 3.08	$ 3.00
Shares
Stock Options Shares Outstanding, Beginning balance	7,847,338	8,034,243
Granted	1,348,504	1,389,452
Exercised	(366,670)	(933,143)
Forfeited or expired	(495,890)	(643,214)
Stock Options Shares Outstanding, Ending balance	8,333,282	7,847,338
Options exercisable, shares	5,536,852	5,076,676
Weighted Average Exercise Price
Stock Options Outstanding, Weighted Average Exercise Price, Beginning balance	$ 18.34	$ 18.37
Granted	$ 17.95	$ 17.45
Exercised	$ 13.84	$ 13.77
Forfeited or expired	$ 32.00	$ 23.50
Stock Options Outstanding, Weighted Average Exercise Price, Ending balance	$ 17.71	$ 18.34
Options Exercisable, Weighted Average Exercise Price	$ 18.02	$ 19.96
Stock Options Outstanding, Weighted Average Remaining Contractual Term	6 years 7 months 6 days	5 years 9 months 15 days
Options exercisable, Weighted Average Remaining Contractual Term	5 years 3 months 11 days	4 years 4 months 28 days
Stock Options Outstanding, Aggregate Intrinsic Value	$ 22,821	$ 23,986
Options exercisable, Aggregate Intrinsic Value	$ 18,637	$ 14,953

XML

Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities Residential Mortgage Repurchase Reserve (Details) (Mortgage Repurchase Reserve [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Mortgage Repurchase Reserve [Member]
Residential mortgage repurchase reserve
Balance at beginning of period	$ 3,258	$ 5,737
Repurchase provision expense	128	505
Adjustments to provision expense	(950)	(2,250)
(Charge offs) recoveries	45	(734)
Balance at end of period	$ 2,481	$ 3,258

XML

Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2015

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

Net period benefit cost for the pension and postretirement plans

	Three Months Ended March 31,						Year Ended December 31,
	2015			2014			2014
	($ in Thousands)
Components of Net Periodic Benefit Cost
Pension Plan:
Service cost	$	3,063		$	2,975		$	11,058
Interest cost	1,642			1,790			7,132
Expected return on plan assets	(5,350		)	(4,855		)	(19,922		)
Amortization of prior service cost	13			15			58
Amortization of actuarial loss	532			325			1,384
Total net periodic benefit cost	$	(100	)	$	250		$	(290	)
Postretirement Plan:
Interest cost	$	35		$	39		$	150
Amortization of actuarial gain	—			(9		)	(35		)
Total net periodic benefit cost	$	35		$	30		$	115

XML

Loans, Allowance for Credit Losses, and Credit Quality Changes in the Allowance for Loan Losses by Portfolio Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	$ 266,302	$ 268,315
Provision for loan losses	4,500	13,000
Charge offs	(13,270)	(44,096)
Recoveries	7,736	29,083
Loans and Leases Receivable, Allowance, Ending Balance	265,268	266,302
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment	8,176	17,866
Ending balance impaired loans collectively evaluated for impairment	29,210	32,565
Total impaired loans	37,386	50,431
Ending balance all other loans collectively evaluated for impairment	227,882	215,871
Total	265,268	266,302
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment	101,756	101,822
Ending balance impaired loans collectively evaluated for impairment	161,407	173,807
Total impaired loans	263,163	275,629
Ending balance all other loans collectively evaluated for impairment	17,715,869	17,318,217
Total loans	17,979,032	17,593,846
Commercial and Industrial Portfolio Segment [Member]
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	116,025	104,501
Provision for loan losses	6,836	14,767
Charge offs	(6,829)	(14,633)
Recoveries	2,179	11,390
Loans and Leases Receivable, Allowance, Ending Balance	118,211	116,025
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment	5,591	13,615
Ending balance impaired loans collectively evaluated for impairment	2,038	2,852
Total impaired loans	7,629	16,467
Ending balance all other loans collectively evaluated for impairment	110,582	99,558
Total	118,211	116,025
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment	58,091	45,118
Ending balance impaired loans collectively evaluated for impairment	29,995	38,437
Total impaired loans	88,086	83,555
Ending balance all other loans collectively evaluated for impairment	6,052,334	5,822,347
Total loans	6,140,420	5,905,902
Commercial Real Estate Owner Occupied Portfolio [Member]
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	16,510	19,476
Provision for loan losses	3,753	(1,296)
Charge offs	(879)	(3,476)
Recoveries	140	1,806
Loans and Leases Receivable, Allowance, Ending Balance	19,524	16,510
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment	910	1,490
Ending balance impaired loans collectively evaluated for impairment	1,149	1,731
Total impaired loans	2,059	3,221
Ending balance all other loans collectively evaluated for impairment	17,465	13,289
Total	19,524	16,510
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment	17,133	20,731
Ending balance impaired loans collectively evaluated for impairment	14,508	15,548
Total impaired loans	31,641	36,279
Ending balance all other loans collectively evaluated for impairment	972,244	971,658
Total loans	1,003,885	1,007,937
Finance Leases Portfolio Segment [Member]
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	1,610	1,607
Provision for loan losses	(130)	35
Charge offs	0	(39)
Recoveries	0	7
Loans and Leases Receivable, Allowance, Ending Balance	1,480	1,610
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment	510	574
Ending balance impaired loans collectively evaluated for impairment	0	0
Total impaired loans	510	574
Ending balance all other loans collectively evaluated for impairment	970	1,036
Total	1,480	1,610
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment	1,720	1,801
Ending balance impaired loans collectively evaluated for impairment	0	0
Total impaired loans	1,720	1,801
Ending balance all other loans collectively evaluated for impairment	47,776	49,728
Total loans	49,496	51,529
Commercial Real Estate Investor Portfolio Segment [Member]
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	46,333	58,156
Provision for loan losses	(4,503)	(17,290)
Charge offs	(1,002)	(4,529)
Recoveries	3,531	9,996
Loans and Leases Receivable, Allowance, Ending Balance	44,359	46,333
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment	689	1,649
Ending balance impaired loans collectively evaluated for impairment	1,339	1,938
Total impaired loans	2,028	3,587
Ending balance all other loans collectively evaluated for impairment	42,331	42,746
Total	44,359	46,333
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment	10,297	19,683
Ending balance impaired loans collectively evaluated for impairment	26,220	26,129
Total impaired loans	36,517	45,812
Ending balance all other loans collectively evaluated for impairment	3,050,463	3,010,673
Total loans	3,086,980	3,056,485
Real Estate Construction Port Folio Segment [Member]
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	20,999	23,418
Provision for loan losses	(402)	(1,277)
Charge offs	0	(1,958)
Recoveries	743	816
Loans and Leases Receivable, Allowance, Ending Balance	21,340	20,999
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment	240	328
Ending balance impaired loans collectively evaluated for impairment	801	767
Total impaired loans	1,041	1,095
Ending balance all other loans collectively evaluated for impairment	20,299	19,904
Total	21,340	20,999
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment	3,843	3,776
Ending balance impaired loans collectively evaluated for impairment	2,297	2,350
Total impaired loans	6,140	6,126
Ending balance all other loans collectively evaluated for impairment	1,013,431	1,002,830
Total loans	1,019,571	1,008,956
Home Equity Port Folio Segments [Member]
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	30,359	32,196
Provision for loan losses	348	7,087
Charge offs	(2,674)	(12,332)
Recoveries	669	3,408
Loans and Leases Receivable, Allowance, Ending Balance	28,702	30,359
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment	10	11
Ending balance impaired loans collectively evaluated for impairment	12,350	13,004
Total impaired loans	12,360	13,015
Ending balance all other loans collectively evaluated for impairment	16,342	17,344
Total	28,702	30,359
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment	911	962
Ending balance impaired loans collectively evaluated for impairment	29,255	30,845
Total impaired loans	30,166	31,807
Ending balance all other loans collectively evaluated for impairment	1,553,448	1,604,251
Total loans	1,583,614	1,636,058
Installment and Credit Cards Portfolio Segment [Member]
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	6,435	2,416
Provision for loan losses	359	6,279
Charge offs	(938)	(2,876)
Recoveries	169	616
Loans and Leases Receivable, Allowance, Ending Balance	6,025	6,435
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment	0	0
Ending balance impaired loans collectively evaluated for impairment	264	308
Total impaired loans	264	308
Ending balance all other loans collectively evaluated for impairment	5,761	6,127
Total	6,025	6,435
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment	0	0
Ending balance impaired loans collectively evaluated for impairment	1,406	1,587
Total impaired loans	1,406	1,587
Ending balance all other loans collectively evaluated for impairment	435,086	452,632
Total loans	436,492	454,219
Residential Portfolio Segment [Member]
Changes in the allowance for loan losses by portfolio segment
Loans and Leases Receivable, Allowance, Beginning Balance	28,031	26,545
Provision for loan losses	(1,761)	4,695
Charge offs	(948)	(4,253)
Recoveries	305	1,044
Loans and Leases Receivable, Allowance, Ending Balance	25,627	28,031
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment	226	199
Ending balance impaired loans collectively evaluated for impairment	11,269	11,965
Total impaired loans	11,495	12,164
Ending balance all other loans collectively evaluated for impairment	14,132	15,867
Total	25,627	28,031
Loans [Abstract]
Ending balance impaired loans individually evaluated for impairment	9,761	9,751
Ending balance impaired loans collectively evaluated for impairment	57,726	58,911
Total impaired loans	67,487	68,662
Ending balance all other loans collectively evaluated for impairment	4,591,087	4,404,098
Total loans	$ 4,658,574	$ 4,472,760

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Short and Long-Term Funding (Short-term Funding Narrative) (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Short Term Debt Disclosure [Abstract]
FHLB advances repaid	$ 500

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Goodwill and Other Intangible Assets Summary of Core Deposit and Other Intangibles (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Summary of core deposit intangibles and other intangibles
Amortization of other intangible assets	$ 801	$ 991
Core Deposit Intangibles [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount	36,230		36,230
Accumulated amortization	(34,875)		(34,433)
Amortization Expense	1,355		1,797
Amortization of other intangible assets	442		2,868
Other Intangibles [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount	30,898		19,283
Accumulated amortization	(14,002)		(13,643)
Amortization Expense	16,896		5,640
Additions during the period	11,615		0
Amortization of other intangible assets	$ 359		$ 879

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Investment Securities AFS and HTM Contractual Maturity Table (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Amortized Cost
Due in one year or less	$ 40,879
Due after one year through five years	233,433
Due after five years through ten years	234,102
Due after ten years	584
Total debt securities	508,998
Fair Value
Due in one year or less	41,115
Due after one year through five years	245,483
Due after five years through ten years	244,730
Due after ten years	609
Total debt securities	531,937
Investment securities available for sale, amortized cost	5,282,339	5,368,259
Investment securities available for sale, at fair value	5,358,310	5,396,812
Ratio of Fair Value to Amortized Cost	101.40%
Amortized Cost
Due in one year or less	0
Due after one year through five years	2,253
Due after five years through ten years	122,372
Due after ten years	313,422
Amortized cost	438,047	404,455
Fair Value
Due in one year or less	0
Due after one year through five years	2,291
Due after five years through ten years	124,896
Due after ten years	319,510
Total debt securities	446,697	413,067
Ratio of Fair Value to Amortized Cost	102.00%
Government-Sponsored Enterprise (GSE) [Member]
Fair Value
Investment securities available for sale, amortized cost	3,613,144	3,700,103
Investment securities available for sale, at fair value	3,675,114	3,730,789
Private Label [Member]
Fair Value
Investment securities available for sale, amortized cost	1,962	2,297
Investment securities available for sale, at fair value	1,953	2,294
GSE commercial mortgage-related securities [Member]
Fair Value
Investment securities available for sale, amortized cost	1,158,217	1,097,913
Investment securities available for sale, at fair value	1,149,256	1,073,893
Equity Securities [Member]
Fair Value
Investment securities available for sale, amortized cost	18
Investment securities available for sale, at fair value	$ 50

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Basis of Presentation

3 Months Ended

Mar. 31, 2015

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.

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Goodwill and Other Intangible Assets Mortgage Servicing Rights Roll-Forward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Mortgage servicing rights:
Mortgage servicing rights at beginning of period	$ 61,379	$ 64,193	$ 64,193
Additions	3,010	1,725	8,253
Amortization	(3,179)		(11,067)
Mortgage servicing rights at end of period	61,210		61,379
Valuation allowance for mortgage servicing rights
Valuation allowance at beginning of period	(1,234)	(913)	(913)
Additions, net	(243)		(321)
Mortgage servicing rights, net	59,733		60,145
Fair value of mortgage servicing rights	64,026		66,342
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	7,919,711		7,999,294
Mortgage servicing rights, net to servicing portfolio	0.75%		0.75%
Mortgage servicing rights expense	3,422		11,388
Valuation allowance at end of period	$ (1,477)		$ (1,234)

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Stock Based Compensation Nonvested Stock Option Activity (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Granted	1,348,504	1,389,452
Nonvested Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Stock Option Shares Outstanding, Beginning Balance	2,770,662	3,110,523
Granted	1,348,504	1,389,452
Vested	(1,313,007)	(1,522,152)
Forfeited	(9,729)	(207,161)
Stock Option Shares Outstanding, Ending Balance	2,796,430	2,770,662
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested Weighted Average Grant Date Fair Value, Beginning balance	3.74	4.69
Granted	3.08	3.00
Vested	4.31	4.92
Forfeited	3.35	4.38
Nonvested Weighted Average Grant Date Fair Value, Ending balance	3.16	3.74

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Investment Securities (Tables)

3 Months Ended

Mar. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Investment securities available for sale

March 31, 2015:	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
	($ in Thousands)
Investment securities available for sale:
U.S. Treasury securities	$	999	$	3	$	—		$	1,002
Obligations of state and political subdivisions (municipal securities)	501,679		22,912		(4		)	524,587
Residential mortgage-related securities:
Government-sponsored enterprise (“GSE”)	3,613,144		73,227		(11,257		)	3,675,114
Private-label	1,962		1		(10		)	1,953
GSE commercial mortgage-related securities	1,158,217		6,114		(15,075		)	1,149,256
Other securities (debt and equity)	6,338		60		—			6,398
Total investment securities available for sale	$	5,282,339	$	102,317	$	(26,346	)	$	5,358,310
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	$	438,047	$	9,482	$	(832	)	$	446,697
Total investment securities held to maturity	$	438,047	$	9,482	$	(832	)	$	446,697
December 31, 2014:	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
	($ in Thousands)
Investment securities available for sale:
U.S. Treasury securities	$	999	$	—	$	(1	)	$	998
Obligations of state and political subdivisions (municipal securities)	560,839		21,869		(29		)	582,679
Residential mortgage-related securities:
GSE	3,700,103		61,236		(30,550		)	3,730,789
Private-label	2,297		7		(10		)	2,294
GSE commercial mortgage-related securities	1,097,913		1,922		(25,942		)	1,073,893
Other securities (debt and equity)	6,108		51		—			6,159
Total investment securities available for sale	$	5,368,259	$	85,085	$	(56,532	)	$	5,396,812
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	$	404,455	$	9,444	$	(832	)	$	413,067
Total investment securities held to maturity	$	404,455	$	9,444	$	(832	)	$	413,067

Investment securities held to maturity

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

March 31, 2015:	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
	($ in Thousands)
Investment securities available for sale:
U.S. Treasury securities	$	999	$	3	$	—		$	1,002
Obligations of state and political subdivisions (municipal securities)	501,679		22,912		(4		)	524,587
Residential mortgage-related securities:
Government-sponsored enterprise (“GSE”)	3,613,144		73,227		(11,257		)	3,675,114
Private-label	1,962		1		(10		)	1,953
GSE commercial mortgage-related securities	1,158,217		6,114		(15,075		)	1,149,256
Other securities (debt and equity)	6,338		60		—			6,398
Total investment securities available for sale	$	5,282,339	$	102,317	$	(26,346	)	$	5,358,310
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	$	438,047	$	9,482	$	(832	)	$	446,697
Total investment securities held to maturity	$	438,047	$	9,482	$	(832	)	$	446,697
December 31, 2014:	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
	($ in Thousands)
Investment securities available for sale:
U.S. Treasury securities	$	999	$	—	$	(1	)	$	998
Obligations of state and political subdivisions (municipal securities)	560,839		21,869		(29		)	582,679
Residential mortgage-related securities:
GSE	3,700,103		61,236		(30,550		)	3,730,789
Private-label	2,297		7		(10		)	2,294
GSE commercial mortgage-related securities	1,097,913		1,922		(25,942		)	1,073,893
Other securities (debt and equity)	6,108		51		—			6,159
Total investment securities available for sale	$	5,368,259	$	85,085	$	(56,532	)	$	5,396,812
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	$	404,455	$	9,444	$	(832	)	$	413,067
Total investment securities held to maturity	$	404,455	$	9,444	$	(832	)	$	413,067

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

	Available for Sale					Held to Maturity
($ in Thousands)	Amortized Cost		Fair Value			Amortized Cost		Fair Value
Due in one year or less	$	40,879	$	41,115		$	—	$	—
Due after one year through five years	233,433		245,483			2,253		2,291
Due after five years through ten years	234,102		244,730			122,372		124,896
Due after ten years	584		609			313,422		319,510
Total debt securities	508,998		531,937			438,047		446,697
Residential mortgage-related securities:
GSE	3,613,144		3,675,114			—		—
Private-label	1,962		1,953			—		—
GSE commercial mortgage-related securities	1,158,217		1,149,256			—		—
Equity securities	18		50			—		—
Total investment securities	$	5,282,339	$	5,358,310		$	438,047	$	446,697
Ratio of Fair Value to Amortized Cost			101.4		%			102.0		%

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

	Less than 12 months						12 months or more						Total
March 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:
Obligations of state and political subdivisions (municipal securities)	2	$	(1	)	$	629	1	$	(3	)	$	186	$	(4	)	$	815
Residential mortgage-related securities:
GSE	22	(805		)	204,345		43	(10,452		)	1,060,452		(11,257		)	1,264,797
Private-label	1	(9		)	1,750		2	(1		)	24		(10		)	1,774
GSE commercial mortgage-related securities	4	(95		)	99,052		20	(14,980		)	455,874		(15,075		)	554,926
Total		$	(910	)	$	305,776		$	(25,436	)	$	1,516,536	$	(26,346	)	$	1,822,312
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	163	$	(568	)	$	73,163	21	$	(264	)	$	9,552	$	(832	)	$	82,715
Total		$	(568	)	$	73,163		$	(264	)	$	9,552	$	(832	)	$	82,715

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, 2014.

	Less than 12 months						12 months or more						Total
December 31, 2014	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	$	(1	)	$	998	—	$	—		$	—	$	(1	)	$	998
Obligations of state and political subdivisions (municipal securities)	6	(9		)	3,374		6	(20		)	2,133		(29		)	5,507
Residential mortgage-related securities:
GSE	16	(1,404		)	333,713		56	(29,146		)	1,256,533		(30,550		)	1,590,246
Private-label	1	(9		)	1,772		2	(1		)	27		(10		)	1,799
GSE commercial mortgage-related securities	9	(1,766		)	329,982		20	(24,176		)	460,425		(25,942		)	790,407
Total		$	(3,189	)	$	669,839		$	(53,343	)	$	1,719,118	$	(56,532	)	$	2,388,957
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	74	$	(216	)	$	31,924	85	$	(616	)	$	38,915	$	(832	)	$	70,839
Total		$	(216	)	$	31,924		$	(616	)	$	38,915	$	(832	)	$	70,839

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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Fair value assumptions of stock options

	2015		2014
Dividend yield	2.00	%	2.00	%
Risk-free interest rate	2.00	%	2.00	%
Weighted average expected volatility	20.00	%	20.00	%
Weighted average expected life	6 years		6 years
Weighted average per share fair value of options	$3.08		$3.00

Summary of Company's Stock Option Activities

Stock Options	Shares		Weighted Average Exercise Price	Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value (000s)
Outstanding at December 31, 2013	8,034,243		$18.37
Granted	1,389,452		$17.45
Exercised	(933,143	)	$13.77
Forfeited or expired	(643,214	)	$23.50
Outstanding at December 31, 2014	7,847,338		$18.34	5.79	$	23,986
Options exercisable at December 31, 2014	5,076,676		$19.96	4.41	$	14,953
Granted	1,348,504		$17.95
Exercised	(366,670	)	$13.84
Forfeited or expired	(495,890	)	$32.00
Outstanding at March 31, 2015	8,333,282		$17.71	6.60	$	22,821
Options exercisable at March 31, 2015	5,536,852		$18.02	5.28	$	18,637

Summary of Company's Nonvested Stock Option Activities

Nonvested Stock Options	Shares		Weighted Average Grant Date Fair Value
Nonvested at December 31, 2013	3,110,523		$4.69
Granted	1,389,452		$3.00
Vested	(1,522,152	)	$4.92
Forfeited	(207,161	)	$4.38
Nonvested at December 31, 2014	2,770,662		$3.74
Granted	1,348,504		$3.08
Vested	(1,313,007	)	$4.31
Forfeited	(9,729	)	$3.35
Nonvested at March 31, 2015	2,796,430		$3.16

Summary of Restricted Stock Awards Activity (Excluding Salary Shares)

Restricted Stock	Shares		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2013	1,511,765		$13.92
Granted	1,177,168		$17.35
Vested	(538,877	)	$14.12
Forfeited	(167,930	)	$15.26
Outstanding at December 31, 2014	1,982,126		$15.79
Granted	1,029,339		$16.77
Vested	(619,358	)	$15.52
Forfeited	(18,834	)	$16.13
Outstanding at March 31, 2015	2,373,273		$16.28

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Loans, Allowance for Credit Losses, and Credit Quality Impaired Loans Recorded Investment, Unpaid Principal Balance, Related Allowance, Average Recorded Investment, and Interest Income Recognized (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 263,163,000	$ 275,629,000
Unpaid Principal Balance	293,587,000	310,811,000
Related Allowance	37,386,000	50,431,000
YTD Average Recorded Investment	266,437,000	290,370,000
YTD Interest Income Recognized	1,661,000	9,384,000
Interest income recognized on accruing restructured loans	1,000,000	5,000,000
Fair Value Mark	77.00%	72.00%
Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	206,632,000	232,166,000
Unpaid Principal Balance	222,893,000	253,186,000
Related Allowance	37,386,000	50,431,000
YTD Average Recorded Investment	208,242,000	242,219,000
YTD Interest Income Recognized	1,522,000	8,797,000
Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	56,531,000	43,463,000
Unpaid Principal Balance	70,694,000	57,625,000
Related Allowance	0	0
YTD Average Recorded Investment	58,195,000	48,151,000
YTD Interest Income Recognized	139,000	587,000
Commercial And Industrial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	88,086,000	83,555,000
Unpaid Principal Balance	98,247,000	93,048,000
Related Allowance	7,629,000	16,467,000
YTD Average Recorded Investment	89,376,000	88,855,000
YTD Interest Income Recognized	369,000	3,221,000
Commercial And Industrial 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	58,274,000	76,433,000
Unpaid Principal Balance	59,809,000	80,414,000
Related Allowance	7,629,000	16,467,000
YTD Average Recorded Investment	58,815,000	80,004,000
YTD Interest Income Recognized	265,000	3,139,000
Commercial And Industrial 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	29,812,000	7,122,000
Unpaid Principal Balance	38,438,000	12,634,000
Related Allowance	0	0
YTD Average Recorded Investment	30,561,000	8,851,000
YTD Interest Income Recognized	104,000	82,000
Commercial Real Estate Owner Occupied Portfolio [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	31,641,000	36,279,000
Unpaid Principal Balance	36,062,000	40,826,000
Related Allowance	2,059,000	3,221,000
YTD Average Recorded Investment	32,201,000	38,848,000
YTD Interest Income Recognized	123,000	900,000
Commercial Real Estate Owner Occupied Portfolio [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	20,147,000	19,839,000
Unpaid Principal Balance	22,390,000	21,807,000
Related Allowance	2,059,000	3,221,000
YTD Average Recorded Investment	20,448,000	20,878,000
YTD Interest Income Recognized	123,000	681,000
Commercial Real Estate Owner Occupied Portfolio [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	11,494,000	16,440,000
Unpaid Principal Balance	13,672,000	19,019,000
Related Allowance	0	0
YTD Average Recorded Investment	11,753,000	17,970,000
YTD Interest Income Recognized	0	219,000
Finance Leases Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,720,000	1,801,000
Unpaid Principal Balance	1,720,000	1,801,000
Related Allowance	510,000	574,000
YTD Average Recorded Investment	1,747,000	2,009,000
YTD Interest Income Recognized	0	0
Finance Leases 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	1,720,000	1,801,000
Unpaid Principal Balance	1,720,000	1,801,000
Related Allowance	510,000	574,000
YTD Average Recorded Investment	1,747,000	2,009,000
YTD Interest Income Recognized	0	0
Finance Leases 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	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
YTD Average Recorded Investment	0	0
YTD Interest Income Recognized	0	0
Commercial And Business Lending [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	121,447,000	121,635,000
Unpaid Principal Balance	136,029,000	135,675,000
Related Allowance	10,198,000	20,262,000
YTD Average Recorded Investment	123,324,000	129,712,000
YTD Interest Income Recognized	492,000	4,121,000
Commercial And Business Lending [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	80,141,000	98,073,000
Unpaid Principal Balance	83,919,000	104,022,000
Related Allowance	10,198,000	20,262,000
YTD Average Recorded Investment	81,010,000	102,891,000
YTD Interest Income Recognized	388,000	3,820,000
Commercial And Business 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	41,306,000	23,562,000
Unpaid Principal Balance	52,110,000	31,653,000
Related Allowance	0	0
YTD Average Recorded Investment	42,314,000	26,821,000
YTD Interest Income Recognized	104,000	301,000
Commercial Real Estate Investor Portfolio Segment [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	36,517,000	45,812,000
Unpaid Principal Balance	42,031,000	54,905,000
Related Allowance	2,028,000	3,587,000
YTD Average Recorded Investment	37,292,000	48,671,000
YTD Interest Income Recognized	295,000	1,383,000
Commercial Real Estate Investor Portfolio Segment [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	32,244,000	36,841,000
Unpaid Principal Balance	35,466,000	40,869,000
Related Allowance	2,028,000	3,587,000
YTD Average Recorded Investment	32,338,000	38,657,000
YTD Interest Income Recognized	287,000	1,250,000
Commercial Real Estate Investor Portfolio Segment [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	4,273,000	8,971,000
Unpaid Principal Balance	6,565,000	14,036,000
Related Allowance	0	0
YTD Average Recorded Investment	4,954,000	10,014,000
YTD Interest Income Recognized	8,000	133,000
Commercial Real Estate Construction Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	6,140,000	6,126,000
Unpaid Principal Balance	8,313,000	9,725,000
Related Allowance	1,041,000	1,095,000
YTD Average Recorded Investment	6,098,000	7,059,000
YTD Interest Income Recognized	17,000	105,000
Commercial Real Estate Construction 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	2,967,000	3,043,000
Unpaid Principal Balance	4,354,000	5,910,000
Related Allowance	1,041,000	1,095,000
YTD Average Recorded Investment	2,987,000	3,818,000
YTD Interest Income Recognized	17,000	105,000
Commercial Real Estate Construction 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	3,173,000	3,083,000
Unpaid Principal Balance	3,959,000	3,815,000
Related Allowance	0	0
YTD Average Recorded Investment	3,111,000	3,241,000
YTD 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	42,657,000	51,938,000
Unpaid Principal Balance	50,344,000	64,630,000
Related Allowance	3,069,000	4,682,000
YTD Average Recorded Investment	43,390,000	55,730,000
YTD Interest Income Recognized	312,000	1,488,000
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	35,211,000	39,884,000
Unpaid Principal Balance	39,820,000	46,779,000
Related Allowance	3,069,000	4,682,000
YTD Average Recorded Investment	35,325,000	42,475,000
YTD Interest Income Recognized	304,000	1,355,000
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	7,446,000	12,054,000
Unpaid Principal Balance	10,524,000	17,851,000
Related Allowance	0	0
YTD Average Recorded Investment	8,065,000	13,255,000
YTD Interest Income Recognized	8,000	133,000
Commercial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	164,104,000	173,573,000
Unpaid Principal Balance	186,373,000	200,305,000
Related Allowance	13,267,000	24,944,000
YTD Average Recorded Investment	166,714,000	185,442,000
YTD Interest Income Recognized	804,000	5,609,000
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	115,352,000	137,957,000
Unpaid Principal Balance	123,739,000	150,801,000
Related Allowance	13,267,000	24,944,000
YTD Average Recorded Investment	116,335,000	145,366,000
YTD Interest Income Recognized	692,000	5,175,000
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	48,752,000	35,616,000
Unpaid Principal Balance	62,634,000	49,504,000
Related Allowance	0	0
YTD Average Recorded Investment	50,379,000	40,076,000
YTD Interest Income Recognized	112,000	434,000
Home Equity [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	30,166,000	31,807,000
Unpaid Principal Balance	33,590,000	35,533,000
Related Allowance	12,360,000	13,015,000
YTD Average Recorded Investment	30,475,000	33,226,000
YTD Interest Income Recognized	328,000	1,528,000
Home Equity [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	29,430,000	31,021,000
Unpaid Principal Balance	32,827,000	34,727,000
Related Allowance	12,360,000	13,015,000
YTD Average Recorded Investment	29,709,000	32,375,000
YTD Interest Income Recognized	326,000	1,510,000
Home Equity [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	736,000	786,000
Unpaid Principal Balance	763,000	806,000
Related Allowance	0	0
YTD Average Recorded Investment	766,000	851,000
YTD Interest Income Recognized	2,000	18,000
Installment and Credit Cards [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,406,000	1,587,000
Unpaid Principal Balance	1,618,000	1,795,000
Related Allowance	264,000	308,000
YTD Average Recorded Investment	1,437,000	1,736,000
YTD Interest Income Recognized	9,000	58,000
Installment and Credit Cards [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,406,000	1,587,000
Unpaid Principal Balance	1,618,000	1,795,000
Related Allowance	264,000	308,000
YTD Average Recorded Investment	1,437,000	1,736,000
YTD Interest Income Recognized	9,000	58,000
Installment and Credit Cards [Member] | 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
YTD Average Recorded Investment	0	0
YTD Interest Income Recognized	0	0
Residential, Prime, Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	67,487,000	68,662,000
Unpaid Principal Balance	72,006,000	73,178,000
Related Allowance	11,495,000	12,164,000
YTD Average Recorded Investment	67,811,000	69,966,000
YTD Interest Income Recognized	520,000	2,189,000
Residential, Prime, 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	60,444,000	61,601,000
Unpaid Principal Balance	64,709,000	65,863,000
Related Allowance	11,495,000	12,164,000
YTD Average Recorded Investment	60,761,000	62,742,000
YTD Interest Income Recognized	495,000	2,054,000
Residential, Prime, 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	7,043,000	7,061,000
Unpaid Principal Balance	7,297,000	7,315,000
Related Allowance	0	0
YTD Average Recorded Investment	7,050,000	7,224,000
YTD Interest Income Recognized	25,000	135,000
Consumer Loan [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	99,059,000	102,056,000
Unpaid Principal Balance	107,214,000	110,506,000
Related Allowance	24,119,000	25,487,000
YTD Average Recorded Investment	99,723,000	104,928,000
YTD Interest Income Recognized	857,000	3,775,000
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	91,280,000	94,209,000
Unpaid Principal Balance	99,154,000	102,385,000
Related Allowance	24,119,000	25,487,000
YTD Average Recorded Investment	91,907,000	96,853,000
YTD Interest Income Recognized	830,000	3,622,000
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	7,779,000	7,847,000
Unpaid Principal Balance	8,060,000	8,121,000
Related Allowance	0	0
YTD Average Recorded Investment	7,816,000	8,075,000
YTD Interest Income Recognized	$ 27,000	$ 153,000

XML

Stock Based Compensation Restricted Stock Activity (Details) (Restricted Stock Award [Member], USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Restricted Stock Award [Member]
Shares
Outstanding Shares, Beginning balance	1,982,126	1,511,765
Granted	1,029,339	1,177,168
Vested	(619,358)	(538,877)
Forfeited	(18,834)	(167,930)
Outstanding Shares, Ending balance	2,373,273	1,982,126
Weighted Average Grant Date Fair Value
Outstanding, Weighted Average Grant Date Fair Value, Beginning balance	$ 15.79	$ 13.92
Granted	$ 16.77	$ 17.35
Vested	$ 15.52	$ 14.12
Forfeited	$ 16.13	$ 15.26
Outstanding Weighted Average Grant Date Fair Value, Ending balance	$ 16.28	$ 15.79

XML

Loans, Allowance for Credit Losses, and Credit Quality (Tables)

3 Months Ended

Mar. 31, 2015

Financing Receivable, Impaired [Line Items]

Loan composition

	March 31, 2015		December 31, 2014
	($ in Thousands)
Commercial and industrial	$	6,140,420	$	5,905,902
Commercial real estate - owner occupied	1,003,885		1,007,937
Lease financing	49,496		51,529
Commercial and business lending	7,193,801		6,965,368
Commercial real estate - investor	3,086,980		3,056,485
Real estate construction	1,019,571		1,008,956
Commercial real estate lending	4,106,551		4,065,441
Total commercial	11,300,352		11,030,809
Home equity	1,583,614		1,636,058
Installment and credit cards	436,492		454,219
Residential mortgage	4,658,574		4,472,760
Total consumer	6,678,680		6,563,037
Total loans	$	17,979,032	$	17,593,846

Changes in the allowance for loan losses

	Three Months Ended March 31, 2015			Year Ended December 31, 2014
	($ in Thousands)
Allowance for Loan Losses:
Balance at beginning of period	$	266,302		$	268,315
Provision for loan losses	4,500			13,000
Charge offs	(13,270		)	(44,096		)
Recoveries	7,736			29,083
Net charge offs	(5,534		)	(15,013		)
Balance at end of period	$	265,268		$	266,302
Allowance for Unfunded Commitments:
Balance at beginning of period	$	24,900		$	21,900
Provision for unfunded commitments	—			3,000
Balance at end of period	$	24,900		$	24,900
Allowance for Credit Losses	$	290,168		$	291,202

Changes in the allowance for loan losses by portfolio segment

$ in Thousands	Commercial and industrial			Commercial real estate - owner occupied			Lease financing			Commercial real estate - investor			Real estate construction			Home equity			Installment and credit cards			Residential mortgage			Total
Balance at Dec 31, 2014	$	116,025		$	16,510		$	1,610		$	46,333		$	20,999		$	30,359		$	6,435		$	28,031		$	266,302
Provision for loan losses	6,836			3,753			(130		)	(4,503		)	(402		)	348			359			(1,761		)	4,500
Charge offs	(6,829		)	(879		)	—			(1,002		)	—			(2,674		)	(938		)	(948		)	(13,270		)
Recoveries	2,179			140			—			3,531			743			669			169			305			7,736
Balance at Mar 31, 2015	$	118,211		$	19,524		$	1,480		$	44,359		$	21,340		$	28,702		$	6,025		$	25,627		$	265,268
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment	$	5,591		$	910		$	510		$	689		$	240		$	10		$	—		$	226		$	8,176
Ending balance impaired loans collectively evaluated for impairment	$	2,038		$	1,149		$	—		$	1,339		$	801		$	12,350		$	264		$	11,269		$	29,210
Total impaired loans	$	7,629		$	2,059		$	510		$	2,028		$	1,041		$	12,360		$	264		$	11,495		$	37,386
Ending balance all other loans collectively evaluated for impairment	$	110,582		$	17,465		$	970		$	42,331		$	20,299		$	16,342		$	5,761		$	14,132		$	227,882
Total	$	118,211		$	19,524		$	1,480		$	44,359		$	21,340		$	28,702		$	6,025		$	25,627		$	265,268
Loans:
Ending balance impaired loans individually evaluated for impairment	$	58,091		$	17,133		$	1,720		$	10,297		$	3,843		$	911		$	—		$	9,761		$	101,756
Ending balance impaired loans collectively evaluated for impairment	$	29,995		$	14,508		$	—		$	26,220		$	2,297		$	29,255		$	1,406		$	57,726		$	161,407
Total impaired loans	$	88,086		$	31,641		$	1,720		$	36,517		$	6,140		$	30,166		$	1,406		$	67,487		$	263,163
Ending balance all other loans collectively evaluated for impairment	$	6,052,334		$	972,244		$	47,776		$	3,050,463		$	1,013,431		$	1,553,448		$	435,086		$	4,591,087		$	17,715,869
Total	$	6,140,420		$	1,003,885		$	49,496		$	3,086,980		$	1,019,571		$	1,583,614		$	436,492		$	4,658,574		$	17,979,032

$ in Thousands	Commercial and industrial			Commercial real estate - owner occupied			Lease financing			Commercial real estate - investor			Real estate construction			Home equity			Installment and credit cards			Residential mortgage			Total
Balance at Dec 31, 2013	$	104,501		$	19,476		$	1,607		$	58,156		$	23,418		$	32,196		$	2,416		$	26,545		$	268,315
Provision for loan losses	14,767			(1,296		)	35			(17,290		)	(1,277		)	7,087			6,279			4,695			13,000
Charge offs	(14,633		)	(3,476		)	(39		)	(4,529		)	(1,958		)	(12,332		)	(2,876		)	(4,253		)	(44,096		)
Recoveries	11,390			1,806			7			9,996			816			3,408			616			1,044			29,083
Balance at Dec 31, 2014	$	116,025		$	16,510		$	1,610		$	46,333		$	20,999		$	30,359		$	6,435		$	28,031		$	266,302
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment	$	13,615		$	1,490		$	574		$	1,649		$	328		$	11		$	—		$	199		$	17,866
Ending balance impaired loans collectively evaluated for impairment	$	2,852		$	1,731		$	—		$	1,938		$	767		$	13,004		$	308		$	11,965		$	32,565
Total impaired loans	$	16,467		$	3,221		$	574		$	3,587		$	1,095		$	13,015		$	308		$	12,164		$	50,431
Ending balance all other loans collectively evaluated for impairment	$	99,558		$	13,289		$	1,036		$	42,746		$	19,904		$	17,344		$	6,127		$	15,867		$	215,871
Total	$	116,025		$	16,510		$	1,610		$	46,333		$	20,999		$	30,359		$	6,435		$	28,031		$	266,302
Loans:
Ending balance impaired loans individually evaluated for impairment	$	45,118		$	20,731		$	1,801		$	19,683		$	3,776		$	962		$	—		$	9,751		$	101,822
Ending balance impaired loans collectively evaluated for impairment	$	38,437		$	15,548		$	—		$	26,129		$	2,350		$	30,845		$	1,587		$	58,911		$	173,807
Total impaired loans	$	83,555		$	36,279		$	1,801		$	45,812		$	6,126		$	31,807		$	1,587		$	68,662		$	275,629
Ending balance all other loans collectively evaluated for impairment	$	5,822,347		$	971,658		$	49,728		$	3,010,673		$	1,002,830		$	1,604,251		$	452,632		$	4,404,098		$	17,318,217
Total	$	5,905,902		$	1,007,937		$	51,529		$	3,056,485		$	1,008,956		$	1,636,058		$	454,219		$	4,472,760		$	17,593,846

Summarized details of Loans

	30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due (a)		Total Past Due		Current		Total
	($ in Thousands)
Accruing loans
Commercial and industrial	$	1,281	$	436	$	197	$	1,914	$	6,076,886	$	6,078,800
Commercial real estate - owner occupied	1,849		—		—		1,849		980,175		982,024
Lease financing	—		—		—		—		47,776		47,776
Commercial and business lending	3,130		436		197		3,763		7,104,837		7,108,600
Commercial real estate - investor	1,767		448		—		2,215		3,071,023		3,073,238
Real estate construction	317		—		—		317		1,013,831		1,014,148
Commercial real estate lending	2,084		448		—		2,532		4,084,854		4,087,386
Total commercial	5,214		884		197		6,295		11,189,691		11,195,986
Home equity	8,637		1,371		85		10,093		1,553,094		1,563,187
Installment and credit cards	1,180		638		1,433		3,251		432,726		435,977
Residential mortgage	3,302		101		—		3,403		4,606,133		4,609,536
Total consumer	13,119		2,110		1,518		16,747		6,591,953		6,608,700
Total accruing loans	$	18,333	$	2,994	$	1,715	$	23,042	$	17,781,644	$	17,804,686
Nonaccrual loans
Commercial and industrial	$	5,828	$	3,415	$	9,935	$	19,178	$	42,442	$	61,620
Commercial real estate - owner occupied	2,275		185		8,644		11,104		10,757		21,861
Lease financing	—		—		513		513		1,207		1,720
Commercial and business lending	8,103		3,600		19,092		30,795		54,406		85,201
Commercial real estate - investor	175		—		5,395		5,570		8,172		13,742
Real estate construction	1,350		173		872		2,395		3,028		5,423
Commercial real estate lending	1,525		173		6,267		7,965		11,200		19,165
Total commercial	9,628		3,773		25,359		38,760		65,606		104,366
Home equity	1,318		1,829		9,578		12,725		7,702		20,427
Installment and credit cards	33		35		154		222		293		515
Residential mortgage	3,276		3,321		17,531		24,128		24,910		49,038
Total consumer	4,627		5,185		27,263		37,075		32,905		69,980
Total nonaccrual loans (b)	$	14,255	$	8,958	$	52,622	$	75,835	$	98,511	$	174,346
Total loans
Commercial and industrial	$	7,109	$	3,851	$	10,132	$	21,092	$	6,119,328	$	6,140,420
Commercial real estate - owner occupied	4,124		185		8,644		12,953		990,932		1,003,885
Lease financing	—		—		513		513		48,983		49,496
Commercial and business lending	11,233		4,036		19,289		34,558		7,159,243		7,193,801
Commercial real estate - investor	1,942		448		5,395		7,785		3,079,195		3,086,980
Real estate construction	1,667		173		872		2,712		1,016,859		1,019,571
Commercial real estate lending	3,609		621		6,267		10,497		4,096,054		4,106,551
Total commercial	14,842		4,657		25,556		45,055		11,255,297		11,300,352
Home equity	9,955		3,200		9,663		22,818		1,560,796		1,583,614
Installment and credit cards	1,213		673		1,587		3,473		433,019		436,492
Residential mortgage	6,578		3,422		17,531		27,531		4,631,043		4,658,574
Total consumer	17,746		7,295		28,781		53,822		6,624,858		6,678,680
Total loans	$	32,588	$	11,952	$	54,337	$	98,877	$	17,880,155	$	17,979,032

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

(b) The percent of nonaccrual loans which are current was 57% at March 31, 2015.

The following table presents loans by past due status at December 31, 2014.

	30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due (a)		Total Past Due		Current		Total
	($ in Thousands)
Accruing loans
Commercial and industrial	$	4,466	$	10,281	$	254	$	15,001	$	5,841,238	$	5,856,239
Commercial real estate - owner occupied	8,429		2,199		—		10,628		971,484		982,112
Lease financing	—		—		—		—		49,728		49,728
Commercial and business lending	12,895		12,480		254		25,629		6,862,450		6,888,079
Commercial real estate - investor	712		496		—		1,208		3,032,592		3,033,800
Real estate construction	951		33		—		984		1,002,573		1,003,557
Commercial real estate lending	1,663		529		—		2,192		4,035,165		4,037,357
Total commercial	14,558		13,009		254		27,821		10,897,615		10,925,436
Home equity	8,037		2,546		52		10,635		1,603,682		1,614,317
Installment and credit cards	1,186		746		1,317		3,249		450,357		453,606
Residential mortgage	2,840		206		—		3,046		4,420,028		4,423,074
Total consumer	12,063		3,498		1,369		16,930		6,474,067		6,490,997
Total accruing loans	$	26,621	$	16,507	$	1,623	$	44,751	$	17,371,682	$	17,416,433
Nonaccrual loans
Commercial and industrial	$	872	$	627	$	10,154	$	11,653	$	38,010	$	49,663
Commercial real estate - owner occupied	3,197		41		8,596		11,834		13,991		25,825
Lease financing	—		—		513		513		1,288		1,801
Commercial and business lending	4,069		668		19,263		24,000		53,289		77,289
Commercial real estate - investor	1,857		459		12,765		15,081		7,604		22,685
Real estate construction	87		73		798		958		4,441		5,399
Commercial real estate lending	1,944		532		13,563		16,039		12,045		28,084
Total commercial	6,013		1,200		32,826		40,039		65,334		105,373
Home equity	1,615		2,306		10,602		14,523		7,218		21,741
Installment and credit cards	96		39		141		276		337		613
Residential mortgage	5,028		2,653		19,730		27,411		22,275		49,686
Total consumer	6,739		4,998		30,473		42,210		29,830		72,040
Total nonaccrual loans (b)	$	12,752	$	6,198	$	63,299	$	82,249	$	95,164	$	177,413
Total loans
Commercial and industrial	$	5,338	$	10,908	$	10,408	$	26,654	$	5,879,248	$	5,905,902
Commercial real estate - owner occupied	11,626		2,240		8,596		22,462		985,475		1,007,937
Lease financing	—		—		513		513		51,016		51,529
Commercial and business lending	16,964		13,148		19,517		49,629		6,915,739		6,965,368
Commercial real estate - investor	2,569		955		12,765		16,289		3,040,196		3,056,485
Real estate construction	1,038		106		798		1,942		1,007,014		1,008,956
Commercial real estate lending	3,607		1,061		13,563		18,231		4,047,210		4,065,441
Total commercial	20,571		14,209		33,080		67,860		10,962,949		11,030,809
Home equity	9,652		4,852		10,654		25,158		1,610,900		1,636,058
Installment and credit cards	1,282		785		1,458		3,525		450,694		454,219
Residential mortgage	7,868		2,859		19,730		30,457		4,442,303		4,472,760
Total consumer	18,802		8,496		31,842		59,140		6,503,897		6,563,037
Total loans	$	39,373	$	22,705	$	64,922	$	127,000	$	17,466,846	$	17,593,846

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2014 (the same as the reported balances for the accruing loans noted above).

(b) The percent of nonaccrual loans which are current was 54% at December 31, 2014.

Summarized details of impaired Loans

	Recorded Investment		Unpaid Principal Balance		Related Allowance		YTD Average Recorded Investment		YTD Interest Income Recognized (a)
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	58,274	$	59,809	$	7,629	$	58,815	$	265
Commercial real estate - owner occupied	20,147		22,390		2,059		20,448		123
Lease financing	1,720		1,720		510		1,747		—
Commercial and business lending	80,141		83,919		10,198		81,010		388
Commercial real estate - investor	32,244		35,466		2,028		32,338		287
Real estate construction	2,967		4,354		1,041		2,987		17
Commercial real estate lending	35,211		39,820		3,069		35,325		304
Total commercial	115,352		123,739		13,267		116,335		692
Home equity	29,430		32,827		12,360		29,709		326
Installment and credit cards	1,406		1,618		264		1,437		9
Residential mortgage	60,444		64,709		11,495		60,761		495
Total consumer	91,280		99,154		24,119		91,907		830
Total loans	$	206,632	$	222,893	$	37,386	$	208,242	$	1,522
Loans with no related allowance
Commercial and industrial	$	29,812	$	38,438	$	—	$	30,561	$	104
Commercial real estate - owner occupied	11,494		13,672		—		11,753		—
Lease financing	—		—		—		—		—
Commercial and business lending	41,306		52,110		—		42,314		104
Commercial real estate - investor	4,273		6,565		—		4,954		8
Real estate construction	3,173		3,959		—		3,111		—
Commercial real estate lending	7,446		10,524		—		8,065		8
Total commercial	48,752		62,634		—		50,379		112
Home equity	736		763		—		766		2
Installment and credit cards	—		—		—		—		—
Residential mortgage	7,043		7,297		—		7,050		25
Total consumer	7,779		8,060		—		7,816		27
Total loans	$	56,531	$	70,694	$	—	$	58,195	$	139
Total
Commercial and industrial	$	88,086	$	98,247	$	7,629	$	89,376	$	369
Commercial real estate - owner occupied	31,641		36,062		2,059		32,201		123
Lease financing	1,720		1,720		510		1,747		—
Commercial and business lending	121,447		136,029		10,198		123,324		492
Commercial real estate - investor	36,517		42,031		2,028		37,292		295
Real estate construction	6,140		8,313		1,041		6,098		17
Commercial real estate lending	42,657		50,344		3,069		43,390		312
Total commercial	164,104		186,373		13,267		166,714		804
Home equity	30,166		33,590		12,360		30,475		328
Installment and credit cards	1,406		1,618		264		1,437		9
Residential mortgage	67,487		72,006		11,495		67,811		520
Total consumer	99,059		107,214		24,119		99,723		857
Total loans (b)	$	263,163	$	293,587	$	37,386	$	266,437	$	1,661

(a) Interest income recognized included $1 million of interest income recognized on accruing restructured loans for the three months ended March 31, 2015

(b) The implied fair value mark on all impaired loans at March 31, 2015, was 77% of their unpaid principal balance. The fair value mark is calculated as the recorded investment, net of the related allowance, divided by the unpaid principal balance.

The following table presents impaired loans at December 31, 2014.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		YTD Average Recorded Investment		YTD Interest Income Recognized (a)
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	76,433	$	80,414	$	16,467	$	80,004	$	3,139
Commercial real estate - owner occupied	19,839		21,807		3,221		20,878		681
Lease financing	1,801		1,801		574		2,009		—
Commercial and business lending	98,073		104,022		20,262		102,891		3,820
Commercial real estate - investor	36,841		40,869		3,587		38,657		1,250
Real estate construction	3,043		5,910		1,095		3,818		105
Commercial real estate lending	39,884		46,779		4,682		42,475		1,355
Total commercial	137,957		150,801		24,944		145,366		5,175
Home equity	31,021		34,727		13,015		32,375		1,510
Installment and credit cards	1,587		1,795		308		1,736		58
Residential mortgage	61,601		65,863		12,164		62,742		2,054
Total consumer	94,209		102,385		25,487		96,853		3,622
Total loans	$	232,166	$	253,186	$	50,431	$	242,219	$	8,797
Loans with no related allowance
Commercial and industrial	$	7,122	$	12,634	$	—	$	8,851	$	82
Commercial real estate - owner occupied	16,440		19,019		—		17,970		219
Lease financing	—		—		—		—		—
Commercial and business lending	23,562		31,653		—		26,821		301
Commercial real estate - investor	8,971		14,036		—		10,014		133
Real estate construction	3,083		3,815		—		3,241		—
Commercial real estate lending	12,054		17,851		—		13,255		133
Total commercial	35,616		49,504		—		40,076		434
Home equity	786		806		—		851		18
Installment and credit cards	—		—		—		—		—
Residential mortgage	7,061		7,315		—		7,224		135
Total consumer	7,847		8,121		—		8,075		153
Total loans	$	43,463	$	57,625	$	—	$	48,151	$	587
Total
Commercial and industrial	$	83,555	$	93,048	$	16,467	$	88,855	$	3,221
Commercial real estate - owner occupied	36,279		40,826		3,221		38,848		900
Lease financing	1,801		1,801		574		2,009		—
Commercial and business lending	121,635		135,675		20,262		129,712		4,121
Commercial real estate - investor	45,812		54,905		3,587		48,671		1,383
Real estate construction	6,126		9,725		1,095		7,059		105
Commercial real estate lending	51,938		64,630		4,682		55,730		1,488
Total commercial	173,573		200,305		24,944		185,442		5,609
Home equity	31,807		35,533		13,015		33,226		1,528
Installment and credit cards	1,587		1,795		308		1,736		58
Residential mortgage	68,662		73,178		12,164		69,966		2,189
Total consumer	102,056		110,506		25,487		104,928		3,775
Total loans (b)	$	275,629	$	310,811	$	50,431	$	290,370	$	9,384

(a) Interest income recognized included $5 million of interest income recognized on accruing restructured loans for the year ended December 31, 2014.

(b) The implied fair value mark on all impaired loans at December 31, 2014, was 72% of their unpaid principal balance. The fair value mark is calculated as the recorded investment, net of the related allowance, divided by the unpaid principal balance.

Nonaccrual and Performing Restructured Loans

	March 31, 2015				December 31, 2014
	Performing Restructured Loans		Nonaccrual Restructured Loans *		Performing Restructured Loans		Nonaccrual Restructured Loans *
	($ in Thousands)
Commercial and industrial	$	26,466	$	6,631	$	33,892	$	3,260
Commercial real estate - owner occupied	9,780		5,705		10,454		5,656
Commercial real estate - investor	22,775		8,697		23,127		15,216
Real estate construction	717		2,349		727		2,438
Home equity	9,739		6,555		10,066		7,518
Installment and credit cards	891		167		974		199
Residential mortgage	18,449		23,449		18,976		23,369
Total	$	88,817	$	53,553	$	98,216	$	57,656

* Nonaccrual restructured loans have been included with nonaccrual loans.

Summary of Restructured Loans

	Three Months Ended March 31, 2015					Three Months Ended March 31, 2014
	Number of Loans	Recorded Investment (1)		Unpaid Principal Balance (2)		Number of Loans	Recorded Investment (1)		Unpaid Principal Balance (2)
	($ in Thousands)
Commercial and industrial	2	$	196	$	208	8	$	3,446	$	7,218
Commercial real estate - owner occupied	5	3,585		3,641		4	5,298		5,781
Commercial real estate - investor	4	3,030		3,042		4	1,643		1,676
Home equity	36	1,782		1,843		30	935		1,218
Installment and credit cards	—	—		—		1	10		20
Residential mortgage	30	2,816		2,864		21	2,750		2,920
Total	77	$	11,409	$	11,598	68	$	14,082	$	18,833

(1) Represents post-modification outstanding recorded investment.

(2) Represents pre-modification outstanding recorded investment.

Troubled debt restructurings subsequent redefault

	Three Months Ended March 31, 2015			Three Months Ended March 31, 2014
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	($ in Thousands)
Commercial real estate - owner occupied	1	$	297	—	$	—
Real estate construction	—	—		1	161
Home equity	24	855		7	388
Installment and credit cards	—	—		1	10
Residential mortgage	16	1,239		12	1,761
Total	41	$	2,391	21	$	2,320

Commercial Loan [Member]

Financing Receivable, Impaired [Line Items]

Commercial and Consumer loans by credit quality indicator

	Pass		Special Mention		Potential Problem		Impaired		Total
	($ in Thousands)
Commercial and industrial	$	5,820,038	$	93,893	$	138,403	$	88,086	$	6,140,420
Commercial real estate - owner occupied	911,673		17,457		43,114		31,641		1,003,885
Lease financing	44,857		910		2,009		1,720		49,496
Commercial and business lending	6,776,568		112,260		183,526		121,447		7,193,801
Commercial real estate - investor	3,013,499		10,938		26,026		36,517		3,086,980
Real estate construction	1,011,271		673		1,487		6,140		1,019,571
Commercial real estate lending	4,024,770		11,611		27,513		42,657		4,106,551
Total commercial	$	10,801,338	$	123,871	$	211,039	$	164,104	$	11,300,352

The following table presents commercial loans by credit quality indicator at December 31, 2014.

	Pass		Special Mention		Potential Problem		Impaired		Total
	($ in Thousands)
Commercial and industrial	$	5,594,497	$	119,328	$	108,522	$	83,555	$	5,905,902
Commercial real estate - owner occupied	904,526		18,437		48,695		36,279		1,007,937
Lease financing	46,931		88		2,709		1,801		51,529
Commercial and business lending	6,545,954		137,853		159,926		121,635		6,965,368
Commercial real estate - investor	2,974,493		12,137		24,043		45,812		3,056,485
Real estate construction	998,972		2,082		1,776		6,126		1,008,956
Commercial real estate lending	3,973,465		14,219		25,819		51,938		4,065,441
Total commercial	$	10,519,419	$	152,072	$	185,745	$	173,573	$	11,030,809

Consumer Loan [Member]

Financing Receivable, Impaired [Line Items]

Commercial and Consumer loans by credit quality indicator

	Performing		30-89 Days Past Due		Potential Problem		Impaired		Total
	($ in Thousands)
Home equity	$	1,542,482	$	10,008	$	958	$	30,166	$	1,583,614
Installment and credit cards	433,268		1,818		—		1,406		436,492
Residential mortgage	4,581,063		3,403		6,621		67,487		4,658,574
Total consumer	$	6,556,813	$	15,229	$	7,579	$	99,059	$	6,678,680

The following table presents consumer loans by credit quality indicator at December 31, 2014.

	Performing		30-89 Days Past Due		Potential Problem		Impaired		Total
	($ in Thousands)
Home equity	$	1,592,788	$	10,583	$	880	$	31,807	$	1,636,058
Installment and credit cards	450,698		1,932		2		1,587		454,219
Residential mortgage	4,397,271		3,046		3,781		68,662		4,472,760
Total consumer	$	6,440,757	$	15,561	$	4,663	$	102,056	$	6,563,037

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Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of core deposit intangibles and other intangibles

	Three Months Ended March 31, 2015			Year Ended December 31, 2014
	($ in Thousands)
Core deposit intangibles:
Gross carrying amount	$	36,230		$	36,230
Accumulated amortization	(34,875		)	(34,433		)
Net book value	$	1,355		$	1,797
Amortization during the period	$	442		$	2,868
Other intangibles:
Gross carrying amount	$	30,898		$	19,283
Accumulated amortization	(14,002		)	(13,643		)
Net book value	$	16,896		$	5,640
Additions during the period	$	11,615		$	—
Amortization during the period	$	359		$	879

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

	Three Months Ended March 31, 2015			Year Ended December 31, 2014
	($ in Thousands)
Mortgage servicing rights:
Mortgage servicing rights at beginning of period	$	61,379		$	64,193
Additions	3,010			8,253
Amortization	(3,179		)	(11,067		)
Mortgage servicing rights at end of period	$	61,210		$	61,379
Valuation allowance at beginning of period	(1,234		)	(913		)
Additions, net	(243		)	(321		)
Valuation allowance at end of period	(1,477		)	(1,234		)
Mortgage servicing rights, net	$	59,733		$	60,145
Fair value of mortgage servicing rights	$	64,026		$	66,342
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	7,919,711			7,999,294
Mortgage servicing rights, net to servicing portfolio	0.75		%	0.75		%
Mortgage servicing rights expense (1)	$	3,422		$	11,388

(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

Estimated amortization expense:	Core Deposit Intangibles		Other Intangibles		Mortgage Servicing Rights
	($ in Thousands)
Nine months ending December 31, 2015	$	962	$	1,299	$	8,643
Year ending December 31, 2016	281		1,696		9,596
Year ending December 31, 2017	112		1,663		7,778
Year ending December 31, 2018	—		1,633		6,338
Year ending December 31, 2019	—		1,334		5,195
Year ending December 31, 2020	—		1,218		4,276
Beyond 2020	—		8,053		19,384
Total Estimated Amortization Expense	$	1,355	$	16,896	$	61,210

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Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 46,672	$ 45,199
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Provision for credit losses	4,500	5,000
Depreciation and amortization	12,268	13,094
Addition to (recovery of) valuation allowance on mortgage servicing rights, net	243	(156)
Amortization of mortgage servicing rights	3,179	2,725
Amortization of other intangible assets	801	991
Amortization and accretion on earning assets, funding, and other, net	9,572	6,537
Tax impact of stock based compensation	638	545
Gain on sales of investment securities, net	0	(378)
Gain on sales of assets and impairment write-downs, net	(1,096)	(728)
Gain on mortgage banking activities, net	(3,141)	(4,100)
Mortgage loans originated and acquired for sale	(268,296)	(203,764)
Proceeds from sales of mortgage loans held for sale	238,399	224,348
Increase in interest receivable	(2,186)	(3,009)
Decrease in interest payable	(948)	(6,474)
Net change in other assets and other liabilities	(23,058)	(6,165)
Net cash provided by operating activities	17,547	73,665
CASH FLOWS FROM INVESTING ACTIVITIES
Net increase in loans	(368,794)	(555,979)
Purchases of:
Available for sale securities	(202,615)	(273,627)
Held to maturity securities	(36,788)	(18,857)
FHLB stock	(115)	(111)
Premises, equipment, and software, net of disposals	(13,944)	(10,848)
Other assets	(1,207)	(850)
Proceeds from:
Sales of available for sale securities	289	80,025
Prepayments, calls, and maturities of available for sale securities	282,835	180,880
Prepayments, calls, and maturities of other assets	5,155	11,036
Net cash received in acquisition	1,202	0
Net cash used in investing activities	(333,982)	(588,331)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits	1,088,088	242,760
Net increase (decrease) in short-term funding	(405,751)	506,980
Repayment of long-term funding	(500,009)	(155,009)
Purchase of common stock returned to authorized but unissued	(30,000)	0
Purchase of preferred stock	0	(806)
Cash dividends on common stock	(15,280)	(14,639)
Cash dividends on preferred stock	(1,228)	(1,244)
Purchase of treasury stock	(4,105)	(42,199)
Net cash provided by financing activities	131,715	535,843
Net increase (decrease) in cash and cash equivalents	(184,720)	21,177
Cash and cash equivalents at beginning of period	1,032,067	602,245	602,245
Cash and cash equivalents at end of period	847,347	623,422	1,032,067
Supplemental disclosures of cash flow information:
Cash paid for interest	19,643	19,578
Cash paid for income taxes	0	4,165
Loans and bank premises transferred to other real estate owned	2,104	6,343
Capitalized mortgage servicing rights	3,010	1,725	8,253
Acquisition:
Fair value of assets acquired, including cash and cash equivalents	5,160	0
Fair value ascribed to goodwill and intangible assets	51,221	0
Fair value of liabilities assumed	12,851	0
Common stock issued in acquisition	$ 43,530	$ 0

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Short and Long-Term Funding (Tables)

3 Months Ended

Mar. 31, 2015

Debt Disclosure [Abstract]

Breakdown of short and long-term debt balances

	March 31, 2015			December 31, 2014
	($ in Thousands)
Short-Term Funding
Federal funds purchased	$	58,700		$	109,770
Securities sold under agreements to repurchase	528,572			384,221
Federal funds purchased and securities sold under agreements to repurchase	$	587,272		$	493,991
FHLB advances	—			500,000
Commercial paper	75,265			74,297
Other short-term funding	75,265			574,297
Total short-term funding	$	662,537		$	1,068,288
Long-Term Funding
FHLB advances	$	2,500,251		$	3,000,260
Senior notes, at par	680,000			680,000
Subordinated notes, at par	250,000			250,000
Other long-term funding and capitalized costs	(326		)	(143		)
Total long-term funding	3,429,925			3,930,117
Total short and long-term funding	$	4,092,462		$	4,998,405

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Segment Reporting Selected Segment Income Statement and Balance Sheet Data (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Income Statement Data Abstract
Net interest income	$ 167,813	$ 164,973
Noninterest income	80,076	73,521
Total revenue	247,889	238,494
Credit provision	4,500	5,000
Noninterest expense	174,255	167,658
Income (loss) before income taxes	69,134	65,836
Income tax expense (benefit)	22,462	20,637
Net income	46,672	45,199
Return on average allocated capital (ROTICE)	10.20%	9.40%
Segment Balance Sheet Data
Average earning assets	24,148,026	21,892,503
Average loans	17,815,115	16,164,617
Average deposits	19,055,196	16,990,272
Average allocated capital (TICE)	1,804,217	1,899,535
Corporate and Commercial Specialty [Member]
Segment Income Statement Data Abstract
Net interest income	75,691	74,065
Noninterest income	12,613	11,854
Total revenue	88,304	85,919
Credit provision	9,526	13,032
Noninterest expense	34,460	35,721
Income (loss) before income taxes	44,318	37,166
Income tax expense (benefit)	15,368	13,008
Net income	28,950	24,158
Return on average allocated capital (ROTICE)	12.50%	11.00%
Segment Balance Sheet Data
Average earning assets	9,218,844	8,850,984
Average loans	9,210,992	8,843,070
Average deposits	5,421,541	5,241,027
Average allocated capital (TICE)	942,764	886,927
Community, Consumer, and Business [Member]
Segment Income Statement Data Abstract
Net interest income	86,357	72,251
Noninterest income	65,514	55,829
Total revenue	151,871	128,080
Credit provision	7,071	4,948
Noninterest expense	118,543	111,199
Income (loss) before income taxes	26,257	11,933
Income tax expense (benefit)	9,190	4,176
Net income	17,067	7,757
Return on average allocated capital (ROTICE)	10.70%	5.90%
Segment Balance Sheet Data
Average earning assets	8,525,399	7,230,394
Average loans	8,525,399	7,230,394
Average deposits	10,522,618	9,539,887
Average allocated capital (TICE)	647,375	535,752
Risk Management and Shared Services [Member]
Segment Income Statement Data Abstract
Net interest income	5,765	18,657
Noninterest income	1,949	5,838
Total revenue	7,714	24,495
Credit provision	(12,097)	(12,980)
Noninterest expense	21,252	20,738
Income (loss) before income taxes	(1,441)	16,737
Income tax expense (benefit)	(2,096)	3,453
Net income	655	13,284
Return on average allocated capital (ROTICE)	(1.10%)	10.20%
Segment Balance Sheet Data
Average earning assets	6,403,783	5,811,125
Average loans	78,724	91,153
Average deposits	3,111,037	2,209,358
Average allocated capital (TICE)	$ 214,078	$ 476,856

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Acquisition (Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Feb. 17, 2015
Business Acquisition [Line Items]
Cash and stock consideration	$ 43,530,000	$ 0
Ahmann & Martin Co. [Member]
Business Acquisition [Line Items]
Cash and stock consideration			48,000,000
Maximum contingent consideration			8,000,000
Goodwill acquired	40,000,000
Other intangible assets, additions during the period			12,000,000
Ahmann & Martin Co. [Member]
Business Acquisition [Line Items]
Other intangible assets, additions during the period	$ 12,000,000

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Loans, Allowance for Credit Losses, and Credit Quality Commercial Loans by Credit Quality Indicator (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Commercial loans by credit quality indicator
Commercial and industrial	$ 6,140,420	$ 5,905,902
Commercial real estate - owner occupied	1,003,885	1,007,937
Lease financing	49,496	51,529
Commercial and business lending	7,193,801	6,965,368
Commercial real estate - investor	3,086,980	3,056,485
Real estate construction	1,019,571	1,008,956
Commercial real estate lending	4,106,551	4,065,441
Total commercial	11,300,352	11,030,809
Pass [Member]
Commercial loans by credit quality indicator
Commercial and industrial	5,820,038	5,594,497
Commercial real estate - owner occupied	911,673	904,526
Lease financing	44,857	46,931
Commercial and business lending	6,776,568	6,545,954
Commercial real estate - investor	3,013,499	2,974,493
Real estate construction	1,011,271	998,972
Commercial real estate lending	4,024,770	3,973,465
Total commercial	10,801,338	10,519,419
Special Mention [Member]
Commercial loans by credit quality indicator
Commercial and industrial	93,893	119,328
Commercial real estate - owner occupied	17,457	18,437
Lease financing	910	88
Commercial and business lending	112,260	137,853
Commercial real estate - investor	10,938	12,137
Real estate construction	673	2,082
Commercial real estate lending	11,611	14,219
Total commercial	123,871	152,072
Potential Problem [Member]
Commercial loans by credit quality indicator
Commercial and industrial	138,403	108,522
Commercial real estate - owner occupied	43,114	48,695
Lease financing	2,009	2,709
Commercial and business lending	183,526	159,926
Commercial real estate - investor	26,026	24,043
Real estate construction	1,487	1,776
Commercial real estate lending	27,513	25,819
Total commercial	211,039	185,745
Impaired [Member]
Commercial loans by credit quality indicator
Commercial and industrial	88,086	83,555
Commercial real estate - owner occupied	31,641	36,279
Lease financing	1,720	1,801
Commercial and business lending	121,447	121,635
Commercial real estate - investor	36,517	45,812
Real estate construction	6,140	6,126
Commercial real estate lending	42,657	51,938
Total commercial	$ 164,104	$ 173,573

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Derivative and Hedging Activities (Details Textuals) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Investment securities and cash equivalents pledged as collateral	$ 7	$ 11
Derivative collateral right to reclaim cash	$ 23	$ 15

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Consolidated Balance Sheets (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks	$ 355,541	$ 444,113
Interest-bearing deposits in other financial institutions	488,426	571,924
Federal funds sold and securities purchased under agreements to resell	3,380	16,030
Investment securities held to maturity, at amortized cost	438,047	404,455
Investment securities available for sale, at fair value	5,358,310	5,396,812
Federal Home Loan Bank and Federal Reserve Bank stocks, at cost	189,222	189,107
Loans held for sale	159,963	154,935
Loans	17,979,032	17,593,846
Allowance for loan losses	(265,268)	(266,302)
Loans, net	17,713,764	17,327,544
Premises and equipment, net	274,591	274,688
Goodwill	968,774	929,168
Other intangible assets, net	77,984	67,582
Trading assets	42,336	35,163
Other assets	998,402	1,010,253
Total assets	27,068,740	26,821,774
LIABILITIES AND STOCKHOLDERS’ EQUITY
Noninterest-bearing demand deposits	4,570,872	4,505,272
Interest-bearing deposits	15,280,720	14,258,232
Total deposits	19,851,592	18,763,504
Federal funds purchased and securities sold under agreements to repurchase	587,272	493,991
Other short-term funding	75,265	574,297
Long-term funding	3,429,925	3,930,117
Trading liabilities	44,730	37,329
Accrued expenses and other liabilities	197,818	222,285
Total liabilities	24,186,602	24,021,523
Stockholders’ equity
Preferred equity	59,727	59,727
Common stock	1,674	1,665
Surplus	1,505,170	1,484,933
Retained earnings	1,509,967	1,497,818
Accumulated other comprehensive income (loss)	24,800	(4,850)
Treasury stock, at cost	(219,200)	(239,042)
Total stockholders’ equity	2,882,138	2,800,251
Total liabilities and stockholders’ equity	$ 27,068,740	$ 26,821,774
Preferred shares issued (in shares)	61,356	61,356
Preferred shares authorized (par value $1.00 per share)	750,000	750,000
Common shares issued (in shares)	167,429,351	166,544,252
Common shares authorized (par value $0.01 per share)	250,000,000	250,000,000
Treasury shares of common stock (in shares)	13,862,507	15,002,318

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Stock Based Compensation (Details Textuals) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of stock options exercised	$ 2,000,000		$ 4,000,000
Total fair value of vested stock options	6,000,000		7,000,000
Recognized compensation expense for vesting of stock options	1,000,000	2,000,000	6,000,000
Unvested share-based payment awards	8,000,000
Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense for vesting of stock options	5,000,000	3,000,000	10,000,000
Recognized compensation expense for accelerated vesting of stock options	700,000
Unvested share-based payment awards	$ 33,000,000

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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	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, 2013	$ 2,891,290	$ 61,862	$ 1,750	$ 1,617,990	$ 1,392,508	$ (24,244)	$ (158,576)
Comprehensive income:
Net income	45,199	0	0	0	45,199	0	0
Other comprehensive income	12,667	0	0	0	0	12,667	0
Comprehensive income	57,866
Common stock issued:
Stock-based compensation plans, net	5,799	0	0	376	(19,173)	0	24,596
Purchase of treasury stock	(42,199)	0	0	0	0	0	(42,199)
Cash dividends:
Common stock ($0.09 per share in 2014 and $0.10 per share in 2015)	(14,639)	0	0		(14,639)	0	0
Preferred stock	(1,244)	0	0	0	(1,244)	0	0
Purchase of preferred stock	806	704	0	0	102	0	0
Stock-based compensation expense, net	4,412	0	0	4,412	0	0	0
Tax benefit of stock-based compensation	545	0	0	545	0	0	0
Ending balance at Mar. 31, 2014	2,901,024	61,158	1,750	1,623,323	1,402,549	(11,577)	(176,179)
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 common stock returned to authorized but unissued	(30,000)	0	(17)	(29,983)	0	0	0
Purchase of treasury stock	(4,105)	0	0	0	0	0	(4,105)
Cash dividends:
Common stock ($0.09 per share in 2014 and $0.10 per share in 2015)	(15,280)	0	0	0	(15,280)	0	0
Preferred stock	(1,228)	0	0	0	(1,228)	0	0
Stock-based compensation expense, net	5,774	0	0	5,774	0	0	0
Tax benefit of stock-based compensation	638	0	0	638	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)

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Loans, Allowance for Credit Losses, and Credit Quality Troubled Debt Restructurings Subsequent Default (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 loan	Mar. 31, 2014 loan
Financing Receivable, Modifications [Line Items]
Number of Loans	41	21
Recorded Investment	$ 2,391	$ 2,320
Commercial Real Estate Owner Occupied Portfolio [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	0
Recorded Investment	297	0
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	1
Recorded Investment	0	161
Home Equity Port Folio Segments [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	24	7
Recorded Investment	855	388
Installment and Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	1
Recorded Investment	0	10
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	16	12
Recorded Investment	$ 1,239	$ 1,761

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Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities (Tables)

3 Months Ended

Mar. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Summary of lending-related and other commitments

	March 31, 2015		December 31, 2014
	($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(1)(2)	$	6,362,769	$	6,884,411
Commercial letters of credit (1)	11,938		9,179
Standby letters of credit (3)	333,716		353,292

⁽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, 2015 or December 31, 2014.

⁽²⁾  Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 11.

⁽³⁾  The Corporation has established a liability of $3 million at March 31, 2015 compared to $4 million at December 31, 2014, as an estimate of the fair value of these financial instruments.

Summary of changes in the residential mortgage repurchase reserve

	For The Three Months Ended March 31, 2015			For The Year Ended December 31, 2014
	($ in Thousands)
Balance at beginning of period	$	3,258		$	5,737
Repurchase provision expense	128			505
Adjustments to provision expense	(950		)	(2,250		)
(Charge offs) recoveries	45			(734		)
Balance at end of period	$	2,481		$	3,258

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Goodwill and Other Intangible Assets (Other Intangible Assets Narrative) (Details Textual) (Ahmann & Martin Co. [Member], USD $) In Thousands, unless otherwise specified	0 Months Ended
	Feb. 17, 2015
Ahmann & Martin Co. [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, additions during the period	$ 12,000

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Fair Value Measurements

3 Months Ended

Mar. 31, 2015

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. Level 1 investment securities primarily include U.S. Treasury and exchange-traded debt and equity securities. 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. Examples of these investment securities include obligations of state and political subdivisions (municipal securities), mortgage-related securities and other debt securities. 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 again use 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 11 for additional disclosure regarding the Corporation’s derivative financial instruments.

The discounted cash flow analysis component in the fair value measurement 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. In conjunction with the FASB’s fair value measurement guidance, the Corporation made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.

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 creditspreads 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, 2015, and December 31, 2014, 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 11 for additional disclosures regarding the Corporation’s foreign currency exchange forwards.

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 11 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, 2015 and December 31, 2014, 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 Measurements Using
	March 31, 2015		Level 1		Level 2		Level 3
	($ in Thousands)
Assets:
Investment securities available for sale:
U.S. Treasury securities	$	1,002	$	1,002	$	—	$	—
Obligations of state and political subdivisions (municipal securities)	524,587		—		524,587		—
Residential mortgage-related securities:
Government-sponsored enterprise (GSE)	3,675,114		—		3,675,114		—
Private-label	1,953		—		1,953		—
GSE commercial mortgage-related securities	1,149,256		—		1,149,256		—
Other securities (debt and equity)	6,398		3,198		3,000		200
Total investment securities available for sale	$	5,358,310	$	4,200	$	5,353,910	$	200
Derivatives (trading and other assets)	$	52,132	$	—	$	48,447	$	3,685
Liabilities:
Derivatives (trading and other liabilities)	$	52,636	$	—	$	50,841	$	1,795
			Fair Value Measurements Using
	December 31, 2014		Level 1		Level 2		Level 3
	($ in Thousands)
Assets:
Investment securities available for sale:
U.S. Treasury securities	$	998	$	998	$	—	$	—
Obligations of state and political subdivisions (municipal securities)	582,679		—		582,679		—
Residential mortgage-related securities:
GSE	3,730,789		—		3,730,789		—
Private-label	2,294		—		2,294		—
GSE commercial mortgage-related securities	1,073,893		—		1,073,893		—
Other securities (debt and equity)	6,159		2,959		3,000		200
Total investment securities available for sale	$	5,396,812	$	3,957	$	5,392,655	$	200
Derivatives (trading and other assets)	$	43,164	$	—	$	41,217	$	1,947
Liabilities:
Derivatives (trading and other liabilities)	$	45,818	$	—	$	43,383	$	2,435

The table below presents a rollforward of the balance sheet amounts for the year ended December 31, 2014 and the three months ended March 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, 2013	$	299		$	1,717
Total net losses included in income:
Mortgage derivative loss	—			(2,205		)
Sales of investment securities	(99		)	—
Balance December 31, 2014	$	200		$	(488	)
Total net gains included in income:
Mortgage derivative gain	—			2,378
Balance March 31, 2015	$	200		$	1,890

For Level 3 assets and liabilities measured at fair value on a recurring or nonrecurring basis as of March 31, 2015, 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 (“IRLC”) 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 Mortgage Risk Management Committee. At March 31, 2015, the closing ratio was 86%.

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 average discounts of 20% to 30%.

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 15.0% and 9.6% at March 31, 2015, 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, 2015 and December 31, 2014, 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
			Fair Value Measurements Using
	March 31, 2015		Level 1		Level 2		Level 3
	($ in Thousands)
Assets:
Loans held for sale	$	161,662	$	—	$	161,662	$	—
Impaired loans (1)	93,580		—		—		93,580
Mortgage servicing rights	64,026		—		—		64,026
			Fair Value Measurements Using
	December 31, 2014		Level 1		Level 2		Level 3
	($ in Thousands)
Assets:
Loans held for sale	$	156,423	$	—	$	156,423	$	—
Impaired loans (1)	83,956		—		—		83,956
Mortgage servicing rights	66,342		—		—		66,342

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

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 2015 and the full year 2014, 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 $2 million for the first three months of 2015 and $21 million for the year ended December 31, 2014. 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 one million and $2 million to asset losses, net for the three months ended March 31, 2015 and the year ended December 31, 2014, 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, 2015
	Carrying Amount		Fair Value		Fair Value Measurements Using
					Level 1		Level 2		Level 3
	($ in Thousands)
Financial assets:
Cash and due from banks	$	355,541	$	355,541	$	355,541	$	—	$	—
Interest-bearing deposits in other financial institutions	488,426		488,426		488,426		—		—
Federal funds sold and securities purchased under agreements to resell	3,380		3,380		3,380		—		—
Investment securities held to maturity	438,047		446,697		—		446,697		—
Investment securities available for sale	5,358,310		5,358,310		4,200		5,353,910		200
FHLB and Federal Reserve Bank stocks	189,222		189,222		—		189,222		—
Loans held for sale	159,963		161,662		—		161,662		—
Loans, net	17,713,764		17,921,155		—		—		17,921,155
Bank owned life insurance	576,707		576,707		—		576,707		—
Accrued interest receivable	69,759		69,759		69,759		—		—
Interest rate-related instruments	38,990		38,990		—		38,990		—
Foreign currency exchange forwards	3,346		3,346		—		3,346		—
Interest rate lock commitments to originate residential mortgage loans held for sale	3,685		3,685		—		—		3,685
Purchased options (time deposit)	6,111		6,111		—		6,111		—
Financial liabilities:
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits	$	18,215,591	$	18,215,591	$	—	$	—	$	18,215,591
Brokered CDs and other time deposits	1,636,001		1,639,738		—		1,639,738		—
Short-term funding	662,537		662,537		—		662,537		—
Long-term funding	3,429,925		3,487,809		—		3,487,809		—
Accrued interest payable	8,582		8,582		8,582		—		—
Interest rate-related instruments	41,633		41,633		—		41,633		—
Foreign currency exchange forwards	3,097		3,097		—		3,097		—
Standby letters of credit (1)	3,373		3,373		—		3,373		—
Forward commitments to sell residential mortgage loans	1,795		1,795		—		—		1,795
Written options (time deposit)	6,111		6,111		—		6,111		—

	December 31, 2014
	Carrying Amount		Fair Value		Fair Value Measurements Using
					Level 1		Level 2		Level 3
	($ in Thousands)
Financial assets:
Cash and due from banks	$	444,113	$	444,113	$	444,113	$	—	$	—
Interest-bearing deposits in other financial institutions	571,924		571,924		571,924		—		—
Federal funds sold and securities purchased under agreements to resell	16,030		16,030		16,030		—		—
Investment securities held to maturity	404,455		413,067		—		413,067		—
Investment securities available for sale	5,396,812		5,396,812		3,957		5,392,655		200
FHLB and Federal Reserve Bank stocks	189,107		189,107		—		189,107		—
Loans held for sale	154,935		156,423		—		156,423		—
Loans, net	17,327,544		17,427,647		—		—		17,427,647
Bank owned life insurance	574,154		574,154		—		574,154		—
Accrued interest receivable	67,573		67,573		67,573		—		—
Interest rate-related instruments	33,023		33,023		—		33,023		—
Foreign currency exchange forwards	2,140		2,140		—		2,140		—
Interest rate lock commitments to originate residential mortgage loans held for sale	1,947		1,947		—		—		1,947
Purchased options (time deposit)	6,054		6,054		—		6,054		—
Financial liabilities:
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits	$	17,192,049	$	17,192,049	$	—	$	—	$	17,192,049
Brokered CDs and other time deposits	1,571,455		1,571,455		—		1,571,455		—
Short-term funding	1,068,288		1,068,288		—		1,068,288		—
Long-term funding	3,930,117		3,975,605		—		3,975,605		—
Accrued interest payable	9,530		9,530		9,530		—		—
Interest rate-related instruments	35,372		35,372		—		35,372		—
Foreign currency exchange forwards	1,957		1,957		—		1,957		—
Standby letters of credit (1)	3,542		3,542		—		3,542		—
Forward commitments to sell residential mortgage loans	2,435		2,435		—		—		2,435
Written options (time deposit)	6,054		6,054		—		6,054		—

(1) The commitment on standby letters of credit was $334 million and $353 million at March 31, 2015 and December 31, 2014, respectively. See Note 13 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, federal funds sold and securities purchased under agreements to resell, and accrued interest receivable – 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), lease financing, residential mortgage, home equity, other installment, and credit cards. 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 deposits, savings, interest-bearing demand deposits, and money market deposits, 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.

Accrued interest payable and short-term funding – For these short-term instruments, the carrying amount is a reasonable estimate of fair value.

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.

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.

Standby letters of credit – The fair value of standby letters of credit represent 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.

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.

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

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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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

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

	Investment Securities Available for Sale			Derivative Financial Instruments
($ in Thousands)
Balance December 31, 2013	$	299		$	1,717
Total net losses included in income:
Mortgage derivative loss	—			(2,205		)
Sales of investment securities	(99		)	—
Balance December 31, 2014	$	200		$	(488	)
Total net gains included in income:
Mortgage derivative gain	—			2,378
Balance March 31, 2015	$	200		$	1,890

Assets and Liabilities Measured on Nonrecurring Basis at Fair Value

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
			Fair Value Measurements Using
	March 31, 2015		Level 1		Level 2		Level 3
	($ in Thousands)
Assets:
Loans held for sale	$	161,662	$	—	$	161,662	$	—
Impaired loans (1)	93,580		—		—		93,580
Mortgage servicing rights	64,026		—		—		64,026
			Fair Value Measurements Using
	December 31, 2014		Level 1		Level 2		Level 3
	($ in Thousands)
Assets:
Loans held for sale	$	156,423	$	—	$	156,423	$	—
Impaired loans (1)	83,956		—		—		83,956
Mortgage servicing rights	66,342		—		—		66,342

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

Estimated fair values of financial instruments

	December 31, 2014
	Carrying Amount		Fair Value		Fair Value Measurements Using
					Level 1		Level 2		Level 3
	($ in Thousands)
Financial assets:
Cash and due from banks	$	444,113	$	444,113	$	444,113	$	—	$	—
Interest-bearing deposits in other financial institutions	571,924		571,924		571,924		—		—
Federal funds sold and securities purchased under agreements to resell	16,030		16,030		16,030		—		—
Investment securities held to maturity	404,455		413,067		—		413,067		—
Investment securities available for sale	5,396,812		5,396,812		3,957		5,392,655		200
FHLB and Federal Reserve Bank stocks	189,107		189,107		—		189,107		—
Loans held for sale	154,935		156,423		—		156,423		—
Loans, net	17,327,544		17,427,647		—		—		17,427,647
Bank owned life insurance	574,154		574,154		—		574,154		—
Accrued interest receivable	67,573		67,573		67,573		—		—
Interest rate-related instruments	33,023		33,023		—		33,023		—
Foreign currency exchange forwards	2,140		2,140		—		2,140		—
Interest rate lock commitments to originate residential mortgage loans held for sale	1,947		1,947		—		—		1,947
Purchased options (time deposit)	6,054		6,054		—		6,054		—
Financial liabilities:
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits	$	17,192,049	$	17,192,049	$	—	$	—	$	17,192,049
Brokered CDs and other time deposits	1,571,455		1,571,455		—		1,571,455		—
Short-term funding	1,068,288		1,068,288		—		1,068,288		—
Long-term funding	3,930,117		3,975,605		—		3,975,605		—
Accrued interest payable	9,530		9,530		9,530		—		—
Interest rate-related instruments	35,372		35,372		—		35,372		—
Foreign currency exchange forwards	1,957		1,957		—		1,957		—
Standby letters of credit (1)	3,542		3,542		—		3,542		—
Forward commitments to sell residential mortgage loans	2,435		2,435		—		—		2,435
Written options (time deposit)	6,054		6,054		—		6,054		—

(1) The commitment on standby letters of credit was $334 million and $353 million at March 31, 2015 and December 31, 2014, respectively. See Note 13 for additional information on the standby letters of credit and for information on the fair value of lending-related commitments.

	March 31, 2015
	Carrying Amount		Fair Value		Fair Value Measurements Using
					Level 1		Level 2		Level 3
	($ in Thousands)
Financial assets:
Cash and due from banks	$	355,541	$	355,541	$	355,541	$	—	$	—
Interest-bearing deposits in other financial institutions	488,426		488,426		488,426		—		—
Federal funds sold and securities purchased under agreements to resell	3,380		3,380		3,380		—		—
Investment securities held to maturity	438,047		446,697		—		446,697		—
Investment securities available for sale	5,358,310		5,358,310		4,200		5,353,910		200
FHLB and Federal Reserve Bank stocks	189,222		189,222		—		189,222		—
Loans held for sale	159,963		161,662		—		161,662		—
Loans, net	17,713,764		17,921,155		—		—		17,921,155
Bank owned life insurance	576,707		576,707		—		576,707		—
Accrued interest receivable	69,759		69,759		69,759		—		—
Interest rate-related instruments	38,990		38,990		—		38,990		—
Foreign currency exchange forwards	3,346		3,346		—		3,346		—
Interest rate lock commitments to originate residential mortgage loans held for sale	3,685		3,685		—		—		3,685
Purchased options (time deposit)	6,111		6,111		—		6,111		—
Financial liabilities:
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits	$	18,215,591	$	18,215,591	$	—	$	—	$	18,215,591
Brokered CDs and other time deposits	1,636,001		1,639,738		—		1,639,738		—
Short-term funding	662,537		662,537		—		662,537		—
Long-term funding	3,429,925		3,487,809		—		3,487,809		—
Accrued interest payable	8,582		8,582		8,582		—		—
Interest rate-related instruments	41,633		41,633		—		41,633		—
Foreign currency exchange forwards	3,097		3,097		—		3,097		—
Standby letters of credit (1)	3,373		3,373		—		3,373		—
Forward commitments to sell residential mortgage loans	1,795		1,795		—		—		1,795
Written options (time deposit)	6,111		6,111		—		6,111		—

Fair Value, Measurements, Recurring [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Assets and Liabilities Measured on Recurring Basis at Fair Value

Assets and Liabilities Measured at Fair Value on a Recurring Basis
			Fair Value Measurements Using
	March 31, 2015		Level 1		Level 2		Level 3
	($ in Thousands)
Assets:
Investment securities available for sale:
U.S. Treasury securities	$	1,002	$	1,002	$	—	$	—
Obligations of state and political subdivisions (municipal securities)	524,587		—		524,587		—
Residential mortgage-related securities:
Government-sponsored enterprise (GSE)	3,675,114		—		3,675,114		—
Private-label	1,953		—		1,953		—
GSE commercial mortgage-related securities	1,149,256		—		1,149,256		—
Other securities (debt and equity)	6,398		3,198		3,000		200
Total investment securities available for sale	$	5,358,310	$	4,200	$	5,353,910	$	200
Derivatives (trading and other assets)	$	52,132	$	—	$	48,447	$	3,685
Liabilities:
Derivatives (trading and other liabilities)	$	52,636	$	—	$	50,841	$	1,795
			Fair Value Measurements Using
	December 31, 2014		Level 1		Level 2		Level 3
	($ in Thousands)
Assets:
Investment securities available for sale:
U.S. Treasury securities	$	998	$	998	$	—	$	—
Obligations of state and political subdivisions (municipal securities)	582,679		—		582,679		—
Residential mortgage-related securities:
GSE	3,730,789		—		3,730,789		—
Private-label	2,294		—		2,294		—
GSE commercial mortgage-related securities	1,073,893		—		1,073,893		—
Other securities (debt and equity)	6,159		2,959		3,000		200
Total investment securities available for sale	$	5,396,812	$	3,957	$	5,392,655	$	200
Derivatives (trading and other assets)	$	43,164	$	—	$	41,217	$	1,947
Liabilities:
Derivatives (trading and other liabilities)	$	45,818	$	—	$	43,383	$	2,435

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Segment Reporting

3 Months Ended

Mar. 31, 2015

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, with no segment representing more than half of the assets of the Corporation as a whole.

The financial information of the Corporation’s segments has been compiled utilizing the accounting policies described in the Corporation's 2014 annual report on Form 10-K with certain exceptions. The more significant of these exceptions are described herein. The Corporation allocates interest income or interest expense using a funds transfer pricing methodology that charges users of funds (assets) interest expense and credits providers of funds (liabilities, primarily deposits) with income 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. 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 using the methodologies described in the Corporation's 2014 annual report on Form 10-K to assess the overall appropriateness of the allowance for credit 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. During 2015, certain organizational and methodology changes were made and, accordingly, 2014 results have been restated and presented on a comparable basis.

A description of each business segment is presented below.

Corporate and Commercial Specialty — The Corporate and Commercial Specialty segment serves a wide range of customers including larger businesses, developers, non-profits, municipalities, and financial institutions. In serving this segment we compete based on an in-depth understanding of our customers’ financial needs, the ability to match market competitive solutions to those needs, and the highest standards of relationship and service excellence in the delivery of these services. Delivery of services is provided through our corporate and commercial units, our commercial real estate unit, as well as our specialized industries and commercial financial services units. Within this segment we provide the following products and services: (1) lending solutions, such as commercial loans and lines of credit, commercial real estate financing, construction loans, letters of credit, leasing, and asset based lending; for our larger clients we also provide loan syndications; (2) deposit and cash management solutions such as commercial checking and interest-bearing deposit products, cash vault and night depository services, liquidity solutions, payables and receivables solutions; and information services; and (3) specialized financial services such as swaps, capital markets, foreign exchange, and international banking solutions.

Community, Consumer, and Business — The Community, Consumer, and Business segment serves individuals, as well as small and mid-size businesses. In serving this segment we compete based on providing a broad range of solutions to meet the needs of our customers in their entire financial lifecycle, convenient access to our services through multiple channels such as branches, phone based services, online and mobile banking, and a relationship based business model which assists our customers in navigating any changes and challenges in their financial circumstances. Delivery of services is provided through our various Consumer Banking, Community Banking, and Private Client units. Within this segment we provide the following products and services: (1) lending solutions such as residential mortgages, home equity loans and lines of credit, personal and installment loans, real estate financing, business loans, and business lines of credit; (2) deposit and transactional solutions such as checking, credit, debit and pre-paid cards, online banking and bill pay, and money transfer services; (3) investable funds solutions such as savings, money market deposit accounts, IRA accounts, certificates of deposit, fixed and variable annuities, full-service, discount and on-line investment brokerage; trust and investment management accounts; (4) insurance, benefits related products and services; and (5) fiduciary services such as administration of pension, profit-sharing and other employee benefit plans, fiduciary and corporate agency services, and institutional asset management.

Risk Management and Shared Services — The Risk Management and Shared Services segment includes Corporate Risk Management, Credit Administration, Finance, Treasury, Operations and Technology, which are key shared functions. The segment also includes Parent Company activity, intersegment eliminations and residual revenue and expenses, representing the difference between actual amounts incurred and the amounts allocated to operating segments, including interest rate risk residuals (funds transfer pricing mismatches) and credit risk and provision residuals (long term credit charge mismatches). The earning assets within this segment include the Corporation’s investment portfolio and capital includes both allocated as well as any remaining unallocated capital.

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, 2015
Net interest income	$	75,691		$	86,357		$	5,765		$	167,813
Noninterest income	12,613			65,514			1,949			80,076
Total revenue	88,304			151,871			7,714			247,889
Credit provision *	9,526			7,071			(12,097		)	4,500
Noninterest expense	34,460			118,543			21,252			174,255
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 (ROT1CE) **	12.5		%	10.7		%	(1.1		)%	10.2		%
Three Months Ended March 31, 2014
Net interest income	$	74,065		$	72,251		$	18,657		$	164,973
Noninterest income	11,854			55,829			5,838			73,521
Total revenue	85,919			128,080			24,495			238,494
Credit provision *	13,032			4,948			(12,980		)	5,000
Noninterest expense	35,721			111,199			20,738			167,658
Income before income taxes	37,166			11,933			16,737			65,836
Income tax expense	13,008			4,176			3,453			20,637
Net income	$	24,158		$	7,757		$	13,284		$	45,199
Return on average allocated capital (ROT1CE) **	11.0		%	5.9		%	10.2		%	9.4		%
Segment Balance Sheet Data
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business			Risk Management and Shared Services			Consolidated Total
Average Balances for 1Q 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 (T1CE) **	$	942,764		$	647,375		$	214,078		$	1,804,217
Average Balances for 1Q 2014
Average earning assets	$	8,850,984		$	7,230,394		$	5,811,125		$	21,892,503
Average loans	8,843,070			7,230,394			91,153			16,164,617
Average deposits	5,241,027			9,539,887			2,209,358			16,990,272
Average allocated capital (T1CE) **	$	886,927		$	535,752		$	476,856		$	1,899,535

* 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 Tier 1 common equity 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 ROT1CE reflects return on average allocated Tier 1 common equity ("T1CE"). The ROT1CE 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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Short and Long-Term Funding (Long-term Funding Narrative) (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended	1 Months Ended
	Mar. 31, 2015	Nov. 30, 2014	Dec. 31, 2014	Sep. 30, 2011	Mar. 31, 2011
Long Term Debt Disclosure [Line Items]
Weighted average interest rate of Long-term advances	0.12%		0.11%
Debt instrument description of variable rate basis	FHLB discount note
FHLB advances	$ 500
2011 Senior Notes [Member] | Senior Notes [Member]
Long Term Debt Disclosure [Line Items]
Debt issuance				130	300
Percentage of interest rate on senior notes					5.125%
2014 Senior Notes [Member] | Senior Notes [Member]
Long Term Debt Disclosure [Line Items]
Debt issuance		250
Percentage of interest rate on senior notes		2.75%
2014 Subordinated Notes [Member] | Subordinated Debt [Member]
Long Term Debt Disclosure [Line Items]
Debt issuance		$ 250
Debt term		10 years
Percentage of interest rate on senior notes		4.25%

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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) (Retained Earnings [Member], USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Retained Earnings [Member]
Cash dividends:
Common stock, per share	$ 0.10	$ 0.09

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Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
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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Short and Long-Term Funding

3 Months Ended

Mar. 31, 2015

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, 2015			December 31, 2014
	($ in Thousands)
Short-Term Funding
Federal funds purchased	$	58,700		$	109,770
Securities sold under agreements to repurchase	528,572			384,221
Federal funds purchased and securities sold under agreements to repurchase	$	587,272		$	493,991
FHLB advances	—			500,000
Commercial paper	75,265			74,297
Other short-term funding	75,265			574,297
Total short-term funding	$	662,537		$	1,068,288
Long-Term Funding
FHLB advances	$	2,500,251		$	3,000,260
Senior notes, at par	680,000			680,000
Subordinated notes, at par	250,000			250,000
Other long-term funding and capitalized costs	(326		)	(143		)
Total long-term funding	3,429,925			3,930,117
Total short and long-term funding	$	4,092,462		$	4,998,405

Short-term funding:

The securities sold under agreements to repurchase represent short-term funding which is collateralized by securities of the U.S. Government or its agencies. The FHLB advances included in short-term funding are those with original contractual maturities of one year or less. During the first quarter of 2015, the Corporation repaid $500 million of short-term FHLB advances.

Long-term funding:

FHLB Advances: Long-term FHLB advances had a weighted-average interest rate of 0.12% for March 31, 2015 compared to 0.11% at December 31, 2014. The FHLB advances are indexed to the FHLB discount note and reprice at varying intervals. The advances offer flexible, low cost, long-term funding that improves the Corporation’s liquidity profile. During the first quarter of 2015, the Corporation early redeemed $500 million of long-term FHLB advances.

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.

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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Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 30, 2015
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, 2015
Amendment Flag	false
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		152,521,932

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Income Taxes

3 Months Ended

Mar. 31, 2015

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The Corporation recognized income tax expense of $22 million for the first quarter of 2015, compared to income tax expense of $21 million for the comparable period in 2014. The effective tax rate was 32.49% for the first quarter of 2015, compared to an effective tax rate of 31.35% for the first quarter of 2014.

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Fair Value Measurements Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financial assets
Cash and due from banks	$ 355,541	$ 444,113
Cash and due from banks, Fair Value	355,541	444,113
Interest-bearing deposits in other financial institutions	488,426	571,924
Interest-bearing deposits in other financial institutions, Fair value	488,426	571,924
Federal funds sold and securities purchased under agreements to resell	3,380	16,030
Federal funds sold and securities purchased under agreements to resell, Fair value	3,380	16,030
Investment securities held to maturity, carrying amount	438,047	404,455
Fair value	446,697	413,067
Investment securities available for sale, at fair value	5,358,310	5,396,812
Investment securities available for sale, fair value	5,358,310	5,396,812
Federal Home Loan Bank and Federal Reserve Bank stocks, carrying amount	189,222	189,107
Federal Home Loan Bank and Federal Reserve Bank stocks, Fair value	189,222	189,107
Loans held for sale	159,963	154,935
Loans held for sale, fair value	161,662	156,423
Loans, net	17,713,764	17,327,544
Loans, net Fair value	17,921,155	17,427,647
Bank owned life insurance, carrying amount	576,707	574,154
Bank owned life insurance, Fair value	576,707	574,154
Accrued interest receivable, carrying amount	69,759	67,573
Accrued interest receivable, Fair value	69,759	67,573
Interest rate-related agreements, carrying amount	38,990	33,023
Interest rate-related agreements, fair value	38,990	33,023
Foreign currency exchange forwards	3,346	2,140
Foreign currency exchange forwards, Fair value	3,346	2,140
Interest rate lock commitments to originate residential mortgage loans held for sale	3,685	1,947
Interest rate lock commitments to originate residential mortgage loans held for sale, fair value	3,685	1,947
Purchased options (time deposit), carrying value	6,111	6,054
Purchased options (time deposit), fair value	6,111	6,054
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits	18,215,591	17,192,049
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, Fair value	18,215,591	17,192,049
Brokered CDs and other time deposits	1,636,001	1,571,455
Brokered CDs and other time deposits, Fair value	1,639,738	1,571,455
Short-term funding	662,537	1,068,288
Short-term funding, Fair value	662,537	1,068,288
Long-term funding	3,429,925	3,930,117
Long-term funding, fair value	3,487,809	3,975,605
Accrued interest payable	8,582	9,530
Accrued interest payable, Fair value	8,582	9,530
Interest rate-related agreements	41,633	35,372
Interest rate-related agreements, Fair value	41,633	35,372
Foreign currency exchange forwards	3,097	1,957
Foreign currency exchange forwards, Fair value	3,097	1,957
Standby letters of credit, carrying amount	3,373	3,542
Standby letters of credit, Fair value	3,373	3,542
Forward commitments to sell residential mortgage loans	1,795	2,435
Forward commitments to sell residential mortgage loans, fair value	1,795	2,435
Written options (time deposit), carrying value	6,111	6,054
Written option (time deposit), fair value	6,111	6,054
Fair Value, Inputs, Level 1 [Member]
Financial assets
Cash and due from banks, Fair Value	355,541	444,113
Interest-bearing deposits in other financial institutions, Fair value	488,426	571,924
Federal funds sold and securities purchased under agreements to resell, Fair value	3,380	16,030
Fair value	0	0
Investment securities available for sale, fair value	4,200	3,957
Federal Home Loan Bank and Federal Reserve Bank stocks, Fair value	0	0
Loans held for sale, fair value	0	0
Loans, net Fair value	0	0
Bank owned life insurance, Fair value	0	0
Accrued interest receivable, Fair value	69,759	67,573
Interest rate-related agreements, fair value	0	0
Foreign currency exchange forwards, Fair value	0	0
Interest rate lock commitments to originate residential mortgage loans held for sale, fair value	0	0
Purchased options (time deposit), fair value	0	0
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, Fair value	0	0
Brokered CDs and other time deposits, Fair value	0	0
Short-term funding, Fair value	0	0
Long-term funding, fair value	0	0
Accrued interest payable, Fair value	8,582	9,530
Interest rate-related agreements, Fair value	0	0
Foreign currency exchange forwards, Fair value	0	0
Standby letters of credit, Fair value	0	0
Forward commitments to sell residential mortgage loans, fair value	0	0
Written option (time deposit), fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Financial assets
Cash and due from banks, Fair Value	0	0
Interest-bearing deposits in other financial institutions, Fair value	0	0
Federal funds sold and securities purchased under agreements to resell, Fair value	0	0
Fair value	446,697	413,067
Investment securities available for sale, fair value	5,353,910	5,392,655
Federal Home Loan Bank and Federal Reserve Bank stocks, Fair value	189,222	189,107
Loans held for sale, fair value	161,662	156,423
Loans, net Fair value	0	0
Bank owned life insurance, Fair value	576,707	574,154
Accrued interest receivable, Fair value	0	0
Interest rate-related agreements, fair value	38,990	33,023
Foreign currency exchange forwards, Fair value	3,346	2,140
Interest rate lock commitments to originate residential mortgage loans held for sale, fair value	0	0
Purchased options (time deposit), fair value	6,111	6,054
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, Fair value	0	0
Brokered CDs and other time deposits, Fair value	1,639,738	1,571,455
Short-term funding, Fair value	662,537	1,068,288
Long-term funding, fair value	3,487,809	3,975,605
Accrued interest payable, Fair value	0	0
Interest rate-related agreements, Fair value	41,633	35,372
Foreign currency exchange forwards, Fair value	3,097	1,957
Standby letters of credit, Fair value	3,373	3,542
Forward commitments to sell residential mortgage loans, fair value	0	0
Written option (time deposit), fair value	6,111	6,054
Fair Value, Inputs, Level 3 [Member]
Financial assets
Cash and due from banks, Fair Value	0	0
Interest-bearing deposits in other financial institutions, Fair value	0	0
Federal funds sold and securities purchased under agreements to resell, Fair value	0	0
Fair value	0	0
Investment securities available for sale, fair value	200	200
Federal Home Loan Bank and Federal Reserve Bank stocks, Fair value	0	0
Loans held for sale, fair value	0	0
Loans, net Fair value	17,921,155	17,427,647
Bank owned life insurance, Fair value	0	0
Accrued interest receivable, Fair value	0	0
Interest rate-related agreements, fair value	0	0
Foreign currency exchange forwards, Fair value	0	0
Interest rate lock commitments to originate residential mortgage loans held for sale, fair value	3,685	1,947
Purchased options (time deposit), fair value	0	0
Financial liabilities
Noninterest-bearing demand, savings, interest-bearing demand, and money market deposits, Fair value	18,215,591	17,192,049
Brokered CDs and other time deposits, Fair value	0	0
Short-term funding, Fair value	0	0
Long-term funding, fair value	0	0
Accrued interest payable, Fair value	0	0
Interest rate-related agreements, Fair value	0	0
Foreign currency exchange forwards, Fair value	0	0
Standby letters of credit, Fair value	0	0
Forward commitments to sell residential mortgage loans, fair value	1,795	2,435
Written option (time deposit), fair value	$ 0	$ 0

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Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
INTEREST INCOME
Interest and fees on loans	$ 151,945	$ 143,387
Interest and dividends on investment securities
Taxable	25,092	26,257
Tax exempt	7,887	6,971
Other interest	1,692	1,449
Total interest income	186,616	178,064
INTEREST EXPENSE
Interest on deposits	7,619	6,159
Interest on Federal funds purchased and securities sold under agreements to repurchase	231	305
Interest on other short-term funding	81	116
Interest on long-term funding	10,872	6,511
Total interest expense	18,803	13,091
NET INTEREST INCOME	167,813	164,973
Provision for credit losses	4,500	5,000
Net interest income after provision for credit losses	163,313	159,973
NONINTEREST INCOME
Trust service fees	12,087	11,711
Service charges on deposit accounts	15,806	16,400
Card-based and other nondeposit fees	12,416	12,509
Insurance commissions	19,728	12,317
Brokerage and annuity commissions	3,683	4,033
Mortgage banking, net	7,408	6,361
Capital market fees, net	2,467	2,322
Bank owned life insurance income	2,875	4,320
Asset gains, net	1,096	728
Investment securities gains, net	0	378
Other	2,510	2,442
Total noninterest income	80,076	73,521
NONINTEREST EXPENSE
Personnel expense	100,152	97,698
Occupancy	17,683	15,560
Equipment	5,772	6,276
Technology	15,558	12,724
Business development and advertising	5,327	5,062
Other intangible amortization	801	991
Loan expense	2,996	2,787
Legal and professional fees	4,538	4,188
Foreclosure / OREO expense	1,425	1,896
FDIC expense	6,500	5,001
Other	13,503	15,475
Total noninterest expense	174,255	167,658
Income before income taxes	69,134	65,836
Income tax expense	22,462	20,637
Net income	46,672	45,199
Preferred stock dividends	1,228	1,244
Net income available to common equity	$ 45,444	$ 43,955
Earnings per common share:
Basic (in usd per share)	$ 0.30	$ 0.27
Diluted (in usd per share)	$ 0.30	$ 0.27
Average common shares outstanding:
Basic (in shares)	150,070	161,467
Diluted (in shares)	151,164	162,188

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Earnings Per Common Share

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Earnings Per Common Share

Earnings Per Common Share

Earnings per 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, and outstanding stock warrants). Presented below are the calculations for basic and diluted earnings per common share.

	For the Three Months Ended March 31,
	2015			2014
	(In Thousands, except per share data)
Net income	$	46,672		$	45,199
Preferred stock dividends	(1,228		)	(1,244		)
Net income available to common equity	$	45,444		$	43,955
Common shareholder dividends	(15,166		)	(14,488		)
Dividends on unvested share-based payment awards	(114		)	(151		)
Undistributed earnings	$	30,164		$	29,316
Undistributed earnings allocated to common shareholders	29,886			29,126
Undistributed earnings allocated to unvested share-based payment awards	278			190
Undistributed earnings	$	30,164		$	29,316
Basic
Distributed earnings to common shareholders	$	15,166		$	14,488
Undistributed earnings allocated to common shareholders	29,886			29,126
Total common shareholders earnings, basic	$	45,052		$	43,614
Diluted
Distributed earnings to common shareholders	$	15,166		$	14,488
Undistributed earnings allocated to common shareholders	29,886			29,126
Total common shareholders earnings, diluted	$	45,052		$	43,614
Weighted average common shares outstanding	150,070			161,467
Effect of dilutive common stock awards	1,094			721
Diluted weighted average common shares outstanding	151,164			162,188
Basic earnings per common share	$	0.30		$	0.27
Diluted earnings per common share	$	0.30		$	0.27

Options to purchase approximately 2 million and 3 million common shares were outstanding for the three months ended March 31, 2015 and 2014, respectively, but excluded from the calculation of diluted earnings per common share as the effect would have been anti-dilutive.

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New Accounting Pronouncements Adopted

3 Months Ended

Mar. 31, 2015

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

New Accounting Pronouncements Adopted

New Accounting Pronouncements Adopted

In August 2014, the FASB issued an amendment to clarify how creditors are to classify certain government-guaranteed mortgage loans upon foreclosure. This amendment requires that a mortgage loan be derecognized and a separate other receivable be recognized upon foreclosure if the following conditions are met: (1) the loan has a government guarantee that is not separate from the loan before foreclosure and (2) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under the claim and (3) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. This amendment is effective for annual reporting periods, including interim periods within those annual periods, beginning after December 15, 2014. Entities may apply the amendments in this update either (a) prospectively to foreclosures that occur after the date of adoption or (b) modified retrospective transition using a cumulative-effect adjustment (through a reclassification to a separate other receivable) as of the beginning of the annual period of adoption. Prior periods should not be adjusted. The Corporation adopted the accounting standard on a prospective basis during the first quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity.

In June 2014, the FASB issued an amendment to clarify the current accounting and disclosures for certain repurchase agreements. The amendments in this update require two accounting changes: (1) change the accounting for repurchase-to-maturity transactions to secured borrowing accounting and (2) require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. The amendments in this update also require additional disclosures for certain transactions on the transfer of financial assets, as well as new disclosures for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings. This amendment is effective for public business entities for the first interim or annual period beginning after December 15, 2014. Early application is prohibited. The Corporation adopted the accounting standard during the first quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity.

In January 2014, the FASB issued an amendment to clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar agreement. In addition, the amendments require interim and annual disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure in accordance with local requirements of the applicable jurisdiction. This amendment is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. An entity can elect to adopt the amendments using either a modified retrospective method or a prospective transition method. The Corporation adopted the accounting standard using the prospective transition method during the first quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity.

In January 2014, the FASB issued an amendment which permits reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). For those investments in qualified affordable housing projects not accounted for using the proportional method, the investment should be accounted for as an equity method investment or a cost method investment. The decision to apply the proportional amortization method of accounting is an accounting policy decision that should be applied consistently to all qualifying affordable housing project investments rather than a decision to be applied to individual investments. This amendment should be applied retrospectively to all periods presented. A reporting entity that uses the effective yield method to account for its investments in qualified affordable housing projects before the date of adoption may continue to apply the effective yield method for those preexisting investments. This amendment is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. The Corporation made an accounting policy election to use the proportional amortization method for investments in qualified affordable housing projects during the first quarter of 2015, which had no material impact on the results of operations, financial position, or liquidity.

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Retirement Plans

3 Months Ended

Mar. 31, 2015

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. In connection with the First Federal acquisition in October 2004, the Corporation assumed the First Federal pension plan (the “First Federal Plan”). The First Federal Plan was frozen on December 31, 2004 and qualified participants in the First Federal Plan became eligible to participate in the RAP as of January 1, 2005. Additional discussion and information on the RAP and the First Federal Plan are collectively referred to below as the “Pension Plan”.

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 Pension and Postretirement Plans for the three months ended March 31, 2015 and 2014, respectively, and for the full year 2014 were as follows.

	Three Months Ended March 31,						Year Ended December 31,
	2015			2014			2014
	($ in Thousands)
Components of Net Periodic Benefit Cost
Pension Plan:
Service cost	$	3,063		$	2,975		$	11,058
Interest cost	1,642			1,790			7,132
Expected return on plan assets	(5,350		)	(4,855		)	(19,922		)
Amortization of prior service cost	13			15			58
Amortization of actuarial loss	532			325			1,384
Total net periodic benefit cost	$	(100	)	$	250		$	(290	)
Postretirement Plan:
Interest cost	$	35		$	39		$	150
Amortization of actuarial gain	—			(9		)	(35		)
Total net periodic benefit cost	$	35		$	30		$	115

The Corporation’s funding policy is to pay at least the minimum amount required by the funding requirements of federal law and regulations, with consideration given to the maximum funding amounts allowed. The Corporation regularly reviews the funding of its Pension Plan.

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Derivative and Hedging Activities

3 Months Ended

Mar. 31, 2015

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 solutions through its capital markets area. To date, all of the notional amounts of customer transactions have been matched with a mirror swap with another counterparty. The Corporation has used, and may again use 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 sheet from changes in interest rates. The predominant derivative and hedging activities include interest rate-related instruments (swaps and caps), foreign currency exchange forwards, 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-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 $7 million of investment securities as collateral at March 31, 2015, and pledged $11 million of investment securities as collateral at December 31, 2014. Under the Dodd-Frank Wall Street Reform and Consumer Protection Act, as of June 10, 2013, the Corporation must 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, 2015, the Corporation posted cash collateral for the margin of $23 million, compared to $15 million at December 31, 2014.

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 14 for additional fair value information and disclosures.

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

							Weighted Average
($ in Thousands)	Notional Amount		Fair Value			Balance Sheet Category	Receive Rate(1)	Pay Rate(1)	Maturity
March 31, 2015
Interest rate-related instruments — customer and mirror	$	1,655,749	$	38,990		Trading assets	1.50%	1.50%	41 months
Interest rate-related instruments — customer and mirror	1,655,749		(41,633		)	Trading liabilities	1.50%	1.50%	41 months
Interest rate lock commitments (mortgage)	207,110		3,685			Other assets	--	--	--
Forward commitments (mortgage)	309,275		(1,795		)	Other liabilities	--	--	--
Foreign currency exchange forwards	88,834		3,346			Trading assets	--	--	--
Foreign currency exchange forwards	79,934		(3,097		)	Trading liabilities	--	--	--
Purchased options (time deposit)	109,510		6,111			Other assets	--	--	--
Written options (time deposit)	109,510		(6,111		)	Other liabilities	--	--	--
December 31, 2014
Interest rate-related instruments — customer and mirror	$	1,636,480	$	33,023		Trading assets	1.60%	1.60%	42 months
Interest rate-related instruments — customer and mirror	1,636,480		(35,372		)	Trading liabilities	1.60%	1.60%	42 months
Interest rate lock commitments (mortgage)	126,379		1,947			Other assets	--	--	--
Forward commitments (mortgage)	234,500		(2,435		)	Other liabilities	--	--	--
Foreign currency exchange forwards	60,742		2,140			Trading assets	--	--	--
Foreign currency exchange forwards	56,573		(1,957		)	Trading liabilities	--	--	--
Purchased options (time deposit)	110,347		6,054			Other assets	--	--	--
Written options (time deposit)	110,347		(6,054		)	Other liabilities	--	--	--

⁽¹⁾  Reflects the weighted average receive rate and pay rate for the interest rate swap derivative financial instruments only.

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	Gain /(Loss) Recognized in Income
		($ in Thousands)
Three Months Ended March 31, 2015
Interest rate-related instruments — customer and mirror, net	Capital market fees, net	$	(294	)
Interest rate lock commitments (mortgage)	Mortgage banking, net	1,738
Forward commitments (mortgage)	Mortgage banking, net	640
Foreign currency exchange forwards	Capital market fees, net	66
Three Months Ended March 31, 2014
Interest rate-related instruments — customer and mirror, net	Capital market fees, net	$	70
Interest rate lock commitments (mortgage)	Mortgage banking, net	375
Forward commitments (mortgage)	Mortgage banking, net	(789		)
Foreign currency exchange forwards	Capital market fees, net	44

Free standing derivatives

The Corporation enters into various derivative contracts which are designated as free standing derivative contracts. 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 sheet 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).

Free standing derivative products are entered into primarily for the benefit of commercial customers seeking to manage their exposures to interest rate risk. 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.

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.

Foreign currency derivatives

The Corporation provides foreign exchange services to customers, primarily forward contracts. Our customers enter into a foreign currency 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 exchange derivative contract. Such foreign exchange contracts are carried at fair value on the consolidated balance sheet with changes in fair value recorded as a component of Capital market fees, net.

Written and purchased option derivatives (time deposit)

The Corporation has periodically entered into written and purchased option derivative instruments to facilitate an equity linked time deposit product (the “Power CD”). During September 2013, the Corporation terminated the Power CD product. 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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Accumulated Other Comprehensive Income (Loss) Reclassifications Out of AOCI (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (4,850)	$ (24,244)
Other Comprehensive Income before reclassifications	47,418	20,627
Amounts reclassified from accumulated other comprehensive income (loss)	545	(47)
Income tax expense	(18,313)	(7,913)
Total other comprehensive income	29,650	12,667
Ending Balance	24,800	(11,577)
Securities Available For Sale [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	18,512	(11,396)
Other Comprehensive Income before reclassifications	47,418	20,627
Amounts reclassified from accumulated other comprehensive income (loss)	0	(378)
Income tax expense	(18,105)	(7,786)
Total other comprehensive income	29,313	12,463
Ending Balance	47,825	1,067
Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(23,362)	(12,848)
Other Comprehensive Income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	545	331
Income tax expense	(208)	(127)
Total other comprehensive income	337	204
Ending Balance	$ (23,025)	$ (12,644)

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Loans, Allowance for Credit Losses, and Credit Quality

3 Months Ended

Mar. 31, 2015

Receivables [Abstract]

Loans, Allowance for Credit Losses, and Credit Quality

NOTE 7: Loans, Allowance for Credit Losses, and Credit Quality

The period end loan composition was as follows.

	March 31, 2015		December 31, 2014
	($ in Thousands)
Commercial and industrial	$	6,140,420	$	5,905,902
Commercial real estate - owner occupied	1,003,885		1,007,937
Lease financing	49,496		51,529
Commercial and business lending	7,193,801		6,965,368
Commercial real estate - investor	3,086,980		3,056,485
Real estate construction	1,019,571		1,008,956
Commercial real estate lending	4,106,551		4,065,441
Total commercial	11,300,352		11,030,809
Home equity	1,583,614		1,636,058
Installment and credit cards	436,492		454,219
Residential mortgage	4,658,574		4,472,760
Total consumer	6,678,680		6,563,037
Total loans	$	17,979,032	$	17,593,846

A summary of the changes in the allowance for credit losses was as follows.

	Three Months Ended March 31, 2015			Year Ended December 31, 2014
	($ in Thousands)
Allowance for Loan Losses:
Balance at beginning of period	$	266,302		$	268,315
Provision for loan losses	4,500			13,000
Charge offs	(13,270		)	(44,096		)
Recoveries	7,736			29,083
Net charge offs	(5,534		)	(15,013		)
Balance at end of period	$	265,268		$	266,302
Allowance for Unfunded Commitments:
Balance at beginning of period	$	24,900		$	21,900
Provision for unfunded commitments	—			3,000
Balance at end of period	$	24,900		$	24,900
Allowance for Credit Losses	$	290,168		$	291,202

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. In general, the change in the allowance for loan losses is a function of a number of factors, including but not limited to changes in the loan portfolio, net charge offs, trends in past due and impaired loans, and the level of potential problem loans. Management considers the allowance for loan losses a critical accounting policy, as assessing these numerous factors involves significant judgment.

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. The determination of the appropriate level of the allowance for unfunded commitments is based upon an evaluation of the unfunded credit facilities, including an assessment of historical commitment utilization experience and credit risk grading of the loan. Net adjustments to the allowance for unfunded commitments are included in provision for credit losses in the consolidated statements of income. See Note 13 for additional information on the allowance for unfunded commitments.

A summary of the changes in the allowance for loan losses by portfolio segment for the three months ended March 31, 2015, was as follows.

$ in Thousands	Commercial and industrial			Commercial real estate - owner occupied			Lease financing			Commercial real estate - investor			Real estate construction			Home equity			Installment and credit cards			Residential mortgage			Total
Balance at Dec 31, 2014	$	116,025		$	16,510		$	1,610		$	46,333		$	20,999		$	30,359		$	6,435		$	28,031		$	266,302
Provision for loan losses	6,836			3,753			(130		)	(4,503		)	(402		)	348			359			(1,761		)	4,500
Charge offs	(6,829		)	(879		)	—			(1,002		)	—			(2,674		)	(938		)	(948		)	(13,270		)
Recoveries	2,179			140			—			3,531			743			669			169			305			7,736
Balance at Mar 31, 2015	$	118,211		$	19,524		$	1,480		$	44,359		$	21,340		$	28,702		$	6,025		$	25,627		$	265,268
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment	$	5,591		$	910		$	510		$	689		$	240		$	10		$	—		$	226		$	8,176
Ending balance impaired loans collectively evaluated for impairment	$	2,038		$	1,149		$	—		$	1,339		$	801		$	12,350		$	264		$	11,269		$	29,210
Total impaired loans	$	7,629		$	2,059		$	510		$	2,028		$	1,041		$	12,360		$	264		$	11,495		$	37,386
Ending balance all other loans collectively evaluated for impairment	$	110,582		$	17,465		$	970		$	42,331		$	20,299		$	16,342		$	5,761		$	14,132		$	227,882
Total	$	118,211		$	19,524		$	1,480		$	44,359		$	21,340		$	28,702		$	6,025		$	25,627		$	265,268
Loans:
Ending balance impaired loans individually evaluated for impairment	$	58,091		$	17,133		$	1,720		$	10,297		$	3,843		$	911		$	—		$	9,761		$	101,756
Ending balance impaired loans collectively evaluated for impairment	$	29,995		$	14,508		$	—		$	26,220		$	2,297		$	29,255		$	1,406		$	57,726		$	161,407
Total impaired loans	$	88,086		$	31,641		$	1,720		$	36,517		$	6,140		$	30,166		$	1,406		$	67,487		$	263,163
Ending balance all other loans collectively evaluated for impairment	$	6,052,334		$	972,244		$	47,776		$	3,050,463		$	1,013,431		$	1,553,448		$	435,086		$	4,591,087		$	17,715,869
Total	$	6,140,420		$	1,003,885		$	49,496		$	3,086,980		$	1,019,571		$	1,583,614		$	436,492		$	4,658,574		$	17,979,032

The allocation methodology used by the Corporation includes allocations for specifically identified impaired loans and loss factor allocations (used for both criticized and non-criticized loan categories), with a component primarily based on historical loss rates and a component primarily based on other qualitative factors. Management allocates the allowance for loan losses by pools of risk within each loan portfolio. The allocation of the allowance for loan losses by loan portfolio is made for analytical purposes and is not necessarily indicative of the trend of future loan losses in any particular category. At March 31, 2015, $27 million of the commercial and industrial allowance for loan losses was attributable to Oil and Gas related credits, compared to $17 million at December 31, 2014. This allocated allowance for loan losses represented 3.46% and 2.26% of period end Oil and Gas related loans at March 31, 2015 and December 31, 2014, respectively. The total allowance for loan losses is available to absorb losses from any segment of the loan portfolio.

For comparison purposes, a summary of the changes in the allowance for loan losses by portfolio segment for the year ended December 31, 2014, was as follows.

$ in Thousands	Commercial and industrial			Commercial real estate - owner occupied			Lease financing			Commercial real estate - investor			Real estate construction			Home equity			Installment and credit cards			Residential mortgage			Total
Balance at Dec 31, 2013	$	104,501		$	19,476		$	1,607		$	58,156		$	23,418		$	32,196		$	2,416		$	26,545		$	268,315
Provision for loan losses	14,767			(1,296		)	35			(17,290		)	(1,277		)	7,087			6,279			4,695			13,000
Charge offs	(14,633		)	(3,476		)	(39		)	(4,529		)	(1,958		)	(12,332		)	(2,876		)	(4,253		)	(44,096		)
Recoveries	11,390			1,806			7			9,996			816			3,408			616			1,044			29,083
Balance at Dec 31, 2014	$	116,025		$	16,510		$	1,610		$	46,333		$	20,999		$	30,359		$	6,435		$	28,031		$	266,302
Allowance for loan losses:
Ending balance impaired loans individually evaluated for impairment	$	13,615		$	1,490		$	574		$	1,649		$	328		$	11		$	—		$	199		$	17,866
Ending balance impaired loans collectively evaluated for impairment	$	2,852		$	1,731		$	—		$	1,938		$	767		$	13,004		$	308		$	11,965		$	32,565
Total impaired loans	$	16,467		$	3,221		$	574		$	3,587		$	1,095		$	13,015		$	308		$	12,164		$	50,431
Ending balance all other loans collectively evaluated for impairment	$	99,558		$	13,289		$	1,036		$	42,746		$	19,904		$	17,344		$	6,127		$	15,867		$	215,871
Total	$	116,025		$	16,510		$	1,610		$	46,333		$	20,999		$	30,359		$	6,435		$	28,031		$	266,302
Loans:
Ending balance impaired loans individually evaluated for impairment	$	45,118		$	20,731		$	1,801		$	19,683		$	3,776		$	962		$	—		$	9,751		$	101,822
Ending balance impaired loans collectively evaluated for impairment	$	38,437		$	15,548		$	—		$	26,129		$	2,350		$	30,845		$	1,587		$	58,911		$	173,807
Total impaired loans	$	83,555		$	36,279		$	1,801		$	45,812		$	6,126		$	31,807		$	1,587		$	68,662		$	275,629
Ending balance all other loans collectively evaluated for impairment	$	5,822,347		$	971,658		$	49,728		$	3,010,673		$	1,002,830		$	1,604,251		$	452,632		$	4,404,098		$	17,318,217
Total	$	5,905,902		$	1,007,937		$	51,529		$	3,056,485		$	1,008,956		$	1,636,058		$	454,219		$	4,472,760		$	17,593,846

The following table presents commercial loans by credit quality indicator at March 31, 2015.

	Pass		Special Mention		Potential Problem		Impaired		Total
	($ in Thousands)
Commercial and industrial	$	5,820,038	$	93,893	$	138,403	$	88,086	$	6,140,420
Commercial real estate - owner occupied	911,673		17,457		43,114		31,641		1,003,885
Lease financing	44,857		910		2,009		1,720		49,496
Commercial and business lending	6,776,568		112,260		183,526		121,447		7,193,801
Commercial real estate - investor	3,013,499		10,938		26,026		36,517		3,086,980
Real estate construction	1,011,271		673		1,487		6,140		1,019,571
Commercial real estate lending	4,024,770		11,611		27,513		42,657		4,106,551
Total commercial	$	10,801,338	$	123,871	$	211,039	$	164,104	$	11,300,352

The following table presents commercial loans by credit quality indicator at December 31, 2014.

	Pass		Special Mention		Potential Problem		Impaired		Total
	($ in Thousands)
Commercial and industrial	$	5,594,497	$	119,328	$	108,522	$	83,555	$	5,905,902
Commercial real estate - owner occupied	904,526		18,437		48,695		36,279		1,007,937
Lease financing	46,931		88		2,709		1,801		51,529
Commercial and business lending	6,545,954		137,853		159,926		121,635		6,965,368
Commercial real estate - investor	2,974,493		12,137		24,043		45,812		3,056,485
Real estate construction	998,972		2,082		1,776		6,126		1,008,956
Commercial real estate lending	3,973,465		14,219		25,819		51,938		4,065,441
Total commercial	$	10,519,419	$	152,072	$	185,745	$	173,573	$	11,030,809

The following table presents consumer loans by credit quality indicator at March 31, 2015.

	Performing		30-89 Days Past Due		Potential Problem		Impaired		Total
	($ in Thousands)
Home equity	$	1,542,482	$	10,008	$	958	$	30,166	$	1,583,614
Installment and credit cards	433,268		1,818		—		1,406		436,492
Residential mortgage	4,581,063		3,403		6,621		67,487		4,658,574
Total consumer	$	6,556,813	$	15,229	$	7,579	$	99,059	$	6,678,680

The following table presents consumer loans by credit quality indicator at December 31, 2014.

	Performing		30-89 Days Past Due		Potential Problem		Impaired		Total
	($ in Thousands)
Home equity	$	1,592,788	$	10,583	$	880	$	31,807	$	1,636,058
Installment and credit cards	450,698		1,932		2		1,587		454,219
Residential mortgage	4,397,271		3,046		3,781		68,662		4,472,760
Total consumer	$	6,440,757	$	15,561	$	4,663	$	102,056	$	6,563,037

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 impaired 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, 2015.

	30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due (a)		Total Past Due		Current		Total
	($ in Thousands)
Accruing loans
Commercial and industrial	$	1,281	$	436	$	197	$	1,914	$	6,076,886	$	6,078,800
Commercial real estate - owner occupied	1,849		—		—		1,849		980,175		982,024
Lease financing	—		—		—		—		47,776		47,776
Commercial and business lending	3,130		436		197		3,763		7,104,837		7,108,600
Commercial real estate - investor	1,767		448		—		2,215		3,071,023		3,073,238
Real estate construction	317		—		—		317		1,013,831		1,014,148
Commercial real estate lending	2,084		448		—		2,532		4,084,854		4,087,386
Total commercial	5,214		884		197		6,295		11,189,691		11,195,986
Home equity	8,637		1,371		85		10,093		1,553,094		1,563,187
Installment and credit cards	1,180		638		1,433		3,251		432,726		435,977
Residential mortgage	3,302		101		—		3,403		4,606,133		4,609,536
Total consumer	13,119		2,110		1,518		16,747		6,591,953		6,608,700
Total accruing loans	$	18,333	$	2,994	$	1,715	$	23,042	$	17,781,644	$	17,804,686
Nonaccrual loans
Commercial and industrial	$	5,828	$	3,415	$	9,935	$	19,178	$	42,442	$	61,620
Commercial real estate - owner occupied	2,275		185		8,644		11,104		10,757		21,861
Lease financing	—		—		513		513		1,207		1,720
Commercial and business lending	8,103		3,600		19,092		30,795		54,406		85,201
Commercial real estate - investor	175		—		5,395		5,570		8,172		13,742
Real estate construction	1,350		173		872		2,395		3,028		5,423
Commercial real estate lending	1,525		173		6,267		7,965		11,200		19,165
Total commercial	9,628		3,773		25,359		38,760		65,606		104,366
Home equity	1,318		1,829		9,578		12,725		7,702		20,427
Installment and credit cards	33		35		154		222		293		515
Residential mortgage	3,276		3,321		17,531		24,128		24,910		49,038
Total consumer	4,627		5,185		27,263		37,075		32,905		69,980
Total nonaccrual loans (b)	$	14,255	$	8,958	$	52,622	$	75,835	$	98,511	$	174,346
Total loans
Commercial and industrial	$	7,109	$	3,851	$	10,132	$	21,092	$	6,119,328	$	6,140,420
Commercial real estate - owner occupied	4,124		185		8,644		12,953		990,932		1,003,885
Lease financing	—		—		513		513		48,983		49,496
Commercial and business lending	11,233		4,036		19,289		34,558		7,159,243		7,193,801
Commercial real estate - investor	1,942		448		5,395		7,785		3,079,195		3,086,980
Real estate construction	1,667		173		872		2,712		1,016,859		1,019,571
Commercial real estate lending	3,609		621		6,267		10,497		4,096,054		4,106,551
Total commercial	14,842		4,657		25,556		45,055		11,255,297		11,300,352
Home equity	9,955		3,200		9,663		22,818		1,560,796		1,583,614
Installment and credit cards	1,213		673		1,587		3,473		433,019		436,492
Residential mortgage	6,578		3,422		17,531		27,531		4,631,043		4,658,574
Total consumer	17,746		7,295		28,781		53,822		6,624,858		6,678,680
Total loans	$	32,588	$	11,952	$	54,337	$	98,877	$	17,880,155	$	17,979,032

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

(b) The percent of nonaccrual loans which are current was 57% at March 31, 2015.

The following table presents loans by past due status at December 31, 2014.

	30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due (a)		Total Past Due		Current		Total
	($ in Thousands)
Accruing loans
Commercial and industrial	$	4,466	$	10,281	$	254	$	15,001	$	5,841,238	$	5,856,239
Commercial real estate - owner occupied	8,429		2,199		—		10,628		971,484		982,112
Lease financing	—		—		—		—		49,728		49,728
Commercial and business lending	12,895		12,480		254		25,629		6,862,450		6,888,079
Commercial real estate - investor	712		496		—		1,208		3,032,592		3,033,800
Real estate construction	951		33		—		984		1,002,573		1,003,557
Commercial real estate lending	1,663		529		—		2,192		4,035,165		4,037,357
Total commercial	14,558		13,009		254		27,821		10,897,615		10,925,436
Home equity	8,037		2,546		52		10,635		1,603,682		1,614,317
Installment and credit cards	1,186		746		1,317		3,249		450,357		453,606
Residential mortgage	2,840		206		—		3,046		4,420,028		4,423,074
Total consumer	12,063		3,498		1,369		16,930		6,474,067		6,490,997
Total accruing loans	$	26,621	$	16,507	$	1,623	$	44,751	$	17,371,682	$	17,416,433
Nonaccrual loans
Commercial and industrial	$	872	$	627	$	10,154	$	11,653	$	38,010	$	49,663
Commercial real estate - owner occupied	3,197		41		8,596		11,834		13,991		25,825
Lease financing	—		—		513		513		1,288		1,801
Commercial and business lending	4,069		668		19,263		24,000		53,289		77,289
Commercial real estate - investor	1,857		459		12,765		15,081		7,604		22,685
Real estate construction	87		73		798		958		4,441		5,399
Commercial real estate lending	1,944		532		13,563		16,039		12,045		28,084
Total commercial	6,013		1,200		32,826		40,039		65,334		105,373
Home equity	1,615		2,306		10,602		14,523		7,218		21,741
Installment and credit cards	96		39		141		276		337		613
Residential mortgage	5,028		2,653		19,730		27,411		22,275		49,686
Total consumer	6,739		4,998		30,473		42,210		29,830		72,040
Total nonaccrual loans (b)	$	12,752	$	6,198	$	63,299	$	82,249	$	95,164	$	177,413
Total loans
Commercial and industrial	$	5,338	$	10,908	$	10,408	$	26,654	$	5,879,248	$	5,905,902
Commercial real estate - owner occupied	11,626		2,240		8,596		22,462		985,475		1,007,937
Lease financing	—		—		513		513		51,016		51,529
Commercial and business lending	16,964		13,148		19,517		49,629		6,915,739		6,965,368
Commercial real estate - investor	2,569		955		12,765		16,289		3,040,196		3,056,485
Real estate construction	1,038		106		798		1,942		1,007,014		1,008,956
Commercial real estate lending	3,607		1,061		13,563		18,231		4,047,210		4,065,441
Total commercial	20,571		14,209		33,080		67,860		10,962,949		11,030,809
Home equity	9,652		4,852		10,654		25,158		1,610,900		1,636,058
Installment and credit cards	1,282		785		1,458		3,525		450,694		454,219
Residential mortgage	7,868		2,859		19,730		30,457		4,442,303		4,472,760
Total consumer	18,802		8,496		31,842		59,140		6,503,897		6,563,037
Total loans	$	39,373	$	22,705	$	64,922	$	127,000	$	17,466,846	$	17,593,846

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2014 (the same as the reported balances for the accruing loans noted above).

(b) The percent of nonaccrual loans which are current was 54% at December 31, 2014.

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

	Recorded Investment		Unpaid Principal Balance		Related Allowance		YTD Average Recorded Investment		YTD Interest Income Recognized (a)
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	58,274	$	59,809	$	7,629	$	58,815	$	265
Commercial real estate - owner occupied	20,147		22,390		2,059		20,448		123
Lease financing	1,720		1,720		510		1,747		—
Commercial and business lending	80,141		83,919		10,198		81,010		388
Commercial real estate - investor	32,244		35,466		2,028		32,338		287
Real estate construction	2,967		4,354		1,041		2,987		17
Commercial real estate lending	35,211		39,820		3,069		35,325		304
Total commercial	115,352		123,739		13,267		116,335		692
Home equity	29,430		32,827		12,360		29,709		326
Installment and credit cards	1,406		1,618		264		1,437		9
Residential mortgage	60,444		64,709		11,495		60,761		495
Total consumer	91,280		99,154		24,119		91,907		830
Total loans	$	206,632	$	222,893	$	37,386	$	208,242	$	1,522
Loans with no related allowance
Commercial and industrial	$	29,812	$	38,438	$	—	$	30,561	$	104
Commercial real estate - owner occupied	11,494		13,672		—		11,753		—
Lease financing	—		—		—		—		—
Commercial and business lending	41,306		52,110		—		42,314		104
Commercial real estate - investor	4,273		6,565		—		4,954		8
Real estate construction	3,173		3,959		—		3,111		—
Commercial real estate lending	7,446		10,524		—		8,065		8
Total commercial	48,752		62,634		—		50,379		112
Home equity	736		763		—		766		2
Installment and credit cards	—		—		—		—		—
Residential mortgage	7,043		7,297		—		7,050		25
Total consumer	7,779		8,060		—		7,816		27
Total loans	$	56,531	$	70,694	$	—	$	58,195	$	139
Total
Commercial and industrial	$	88,086	$	98,247	$	7,629	$	89,376	$	369
Commercial real estate - owner occupied	31,641		36,062		2,059		32,201		123
Lease financing	1,720		1,720		510		1,747		—
Commercial and business lending	121,447		136,029		10,198		123,324		492
Commercial real estate - investor	36,517		42,031		2,028		37,292		295
Real estate construction	6,140		8,313		1,041		6,098		17
Commercial real estate lending	42,657		50,344		3,069		43,390		312
Total commercial	164,104		186,373		13,267		166,714		804
Home equity	30,166		33,590		12,360		30,475		328
Installment and credit cards	1,406		1,618		264		1,437		9
Residential mortgage	67,487		72,006		11,495		67,811		520
Total consumer	99,059		107,214		24,119		99,723		857
Total loans (b)	$	263,163	$	293,587	$	37,386	$	266,437	$	1,661

(a) Interest income recognized included $1 million of interest income recognized on accruing restructured loans for the three months ended March 31, 2015

(b) The implied fair value mark on all impaired loans at March 31, 2015, was 77% of their unpaid principal balance. The fair value mark is calculated as the recorded investment, net of the related allowance, divided by the unpaid principal balance.

The following table presents impaired loans at December 31, 2014.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		YTD Average Recorded Investment		YTD Interest Income Recognized (a)
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	76,433	$	80,414	$	16,467	$	80,004	$	3,139
Commercial real estate - owner occupied	19,839		21,807		3,221		20,878		681
Lease financing	1,801		1,801		574		2,009		—
Commercial and business lending	98,073		104,022		20,262		102,891		3,820
Commercial real estate - investor	36,841		40,869		3,587		38,657		1,250
Real estate construction	3,043		5,910		1,095		3,818		105
Commercial real estate lending	39,884		46,779		4,682		42,475		1,355
Total commercial	137,957		150,801		24,944		145,366		5,175
Home equity	31,021		34,727		13,015		32,375		1,510
Installment and credit cards	1,587		1,795		308		1,736		58
Residential mortgage	61,601		65,863		12,164		62,742		2,054
Total consumer	94,209		102,385		25,487		96,853		3,622
Total loans	$	232,166	$	253,186	$	50,431	$	242,219	$	8,797
Loans with no related allowance
Commercial and industrial	$	7,122	$	12,634	$	—	$	8,851	$	82
Commercial real estate - owner occupied	16,440		19,019		—		17,970		219
Lease financing	—		—		—		—		—
Commercial and business lending	23,562		31,653		—		26,821		301
Commercial real estate - investor	8,971		14,036		—		10,014		133
Real estate construction	3,083		3,815		—		3,241		—
Commercial real estate lending	12,054		17,851		—		13,255		133
Total commercial	35,616		49,504		—		40,076		434
Home equity	786		806		—		851		18
Installment and credit cards	—		—		—		—		—
Residential mortgage	7,061		7,315		—		7,224		135
Total consumer	7,847		8,121		—		8,075		153
Total loans	$	43,463	$	57,625	$	—	$	48,151	$	587
Total
Commercial and industrial	$	83,555	$	93,048	$	16,467	$	88,855	$	3,221
Commercial real estate - owner occupied	36,279		40,826		3,221		38,848		900
Lease financing	1,801		1,801		574		2,009		—
Commercial and business lending	121,635		135,675		20,262		129,712		4,121
Commercial real estate - investor	45,812		54,905		3,587		48,671		1,383
Real estate construction	6,126		9,725		1,095		7,059		105
Commercial real estate lending	51,938		64,630		4,682		55,730		1,488
Total commercial	173,573		200,305		24,944		185,442		5,609
Home equity	31,807		35,533		13,015		33,226		1,528
Installment and credit cards	1,587		1,795		308		1,736		58
Residential mortgage	68,662		73,178		12,164		69,966		2,189
Total consumer	102,056		110,506		25,487		104,928		3,775
Total loans (b)	$	275,629	$	310,811	$	50,431	$	290,370	$	9,384

(a) Interest income recognized included $5 million of interest income recognized on accruing restructured loans for the year ended December 31, 2014.

(b) The implied fair value mark on all impaired loans at December 31, 2014, was 72% of their unpaid principal balance. The fair value mark is calculated as the recorded investment, net of the related allowance, divided by the unpaid principal balance.

Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Loans are generally placed on nonaccrual status when contractually past due 90 days or more as to interest or principal payments, unless the loan is well secured and in the process of collection. Additionally, whenever management becomes aware of facts or circumstances that may adversely impact the collectability of principal or interest on loans, it is management’s practice to place such loans on nonaccrual status immediately, rather than delaying such action until the loans become 90 days past due. When a loan is placed on nonaccrual status, previously accrued and uncollected interest is reversed, amortization of related deferred loan fees or costs is suspended, and income is recorded only to the extent that interest payments are subsequently received in cash and a determination has been made that the principal and interest of the loan is collectible. If collectability of the principal and interest is in doubt, payments received are applied to loan principal.

While a loan is in nonaccrual status, some or all of the cash interest payments received may be treated as interest income on a cash basis as long as the remaining recorded investment in the asset (i.e., after charge off of identified losses, if any) is deemed to be fully collectible. The determination as to the ultimate collectability of the asset’s remaining recorded investment must be supported by a current, well documented, credit evaluation of the borrower’s financial condition and prospects for repayment, including consideration of the borrower’s sustained historical repayment performance and other relevant factors. A nonaccrual loan is returned to accrual status when all delinquent principal and interest payments become current in accordance with the terms of the loan agreement, the borrower has demonstrated a period of sustained repayment performance, and the ultimate collectability of the total contractual principal and interest is no longer in doubt. A sustained period of repayment performance generally would be a minimum of six months.

Troubled Debt Restructurings (“Restructured Loans”):

Loans are considered restructured loans if concessions have been granted to borrowers that are experiencing financial difficulty. The concessions granted generally involve the modification of terms of the loan, such as changes in payment schedule or interest rate, which generally would not otherwise be considered. Restructured loans can involve loans remaining on nonaccrual, moving to nonaccrual, or continuing on accrual status, depending on the individual facts and circumstances of the borrower. Nonaccrual restructured loans are included and treated with all other nonaccrual loans. In addition, all accruing restructured loans are reported as troubled debt restructurings, which are considered and accounted for as impaired loans. Generally, restructured loans remain on nonaccrual until the customer has attained a sustained period of repayment performance under the modified loan terms (generally a minimum of six months). However, performance prior to the restructuring, or significant events that coincide with the restructuring, are considered in assessing whether the borrower can meet the new terms and whether the loan should be returned to or maintained on accrual status. If the borrower’s ability to meet the revised payment schedule is not reasonably assured, the loan remains on nonaccrual status. The Corporation had an $11 million recorded investment in loans modified in troubled debt restructurings for the three months ended March 31, 2015, of which $2 million was in accrual status and $9 million was in nonaccrual pending a sustained period of repayment.

All restructured loans are disclosed as restructured loans in the calendar year of restructuring. In subsequent years, a restructured loan modified at a market rate that has performed according to the modified terms for at least six months will cease being disclosed as a restructured loan. A loan that has been modified at a below market rate will return to performing status if it satisfies the six month performance requirement; however, it will remain classified as a restructured loan. The following table presents nonaccrual and performing restructured loans by loan portfolio.

	March 31, 2015				December 31, 2014
	Performing Restructured Loans		Nonaccrual Restructured Loans *		Performing Restructured Loans		Nonaccrual Restructured Loans *
	($ in Thousands)
Commercial and industrial	$	26,466	$	6,631	$	33,892	$	3,260
Commercial real estate - owner occupied	9,780		5,705		10,454		5,656
Commercial real estate - investor	22,775		8,697		23,127		15,216
Real estate construction	717		2,349		727		2,438
Home equity	9,739		6,555		10,066		7,518
Installment and credit cards	891		167		974		199
Residential mortgage	18,449		23,449		18,976		23,369
Total	$	88,817	$	53,553	$	98,216	$	57,656

* Nonaccrual restructured loans have been included with nonaccrual loans.

The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio for the three months ended March 31, 2015 and 2014, and the recorded investment and unpaid principal balance as of March 31, 2015 and 2014.

	Three Months Ended March 31, 2015					Three Months Ended March 31, 2014
	Number of Loans	Recorded Investment (1)		Unpaid Principal Balance (2)		Number of Loans	Recorded Investment (1)		Unpaid Principal Balance (2)
	($ in Thousands)
Commercial and industrial	2	$	196	$	208	8	$	3,446	$	7,218
Commercial real estate - owner occupied	5	3,585		3,641		4	5,298		5,781
Commercial real estate - investor	4	3,030		3,042		4	1,643		1,676
Home equity	36	1,782		1,843		30	935		1,218
Installment and credit cards	—	—		—		1	10		20
Residential mortgage	30	2,816		2,864		21	2,750		2,920
Total	77	$	11,409	$	11,598	68	$	14,082	$	18,833

(1) Represents post-modification outstanding recorded investment.

(2) 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, 2015, 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 for the three months ended March 31, 2015, primarily included maturity date extensions, interest rate concessions, payment schedule modifications, non-reaffirmed Chapter 7 bankruptcies, or a combination of these concessions.

The following table provides the number of loans modified in a troubled debt restructuring during the previous 12 months which subsequently defaulted during the three months ended March 31, 2015 and 2014, as well as the recorded investment in these restructured loans as of March 31, 2015 and 2014.

	Three Months Ended March 31, 2015			Three Months Ended March 31, 2014
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	($ in Thousands)
Commercial real estate - owner occupied	1	$	297	—	$	—
Real estate construction	—	—		1	161
Home equity	24	855		7	388
Installment and credit cards	—	—		1	10
Residential mortgage	16	1,239		12	1,761
Total	41	$	2,391	21	$	2,320

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.

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Loans, Allowance for Credit Losses, and Credit Quality (Details Textuals) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	$ 265,268,000		$ 266,302,000	$ 268,315,000
Recorded Investment	11,409,000	14,082,000
Restructured Loans Subsequently Accruing	2,000,000
YTD Restructured Loans Still On Nonaccrual	9,000,000
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	118,211,000		116,025,000	104,501,000
Commercial Portfolio Segment [Member] | Oil and Gas Industry [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	$ 27,000,000		$ 17,000,000
Allocated allowance for loan losses, percent	3.46%		2.26%

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Stock-Based Compensation

3 Months Ended

Mar. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Stock-Based Compensation

Stock-Based Compensation

At March 31, 2015, the Corporation had one stock-based compensation plan, the 2013 Incentive Compensation Plan. All stock options granted under this plan have an exercise price that is equal to the closing price of the Corporation’s stock on the grant date.

The Corporation also 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”).

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. Beginning with the 2014 grants, expenses related to stock options and restricted stock 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 2015 and full year 2014.

	2015		2014
Dividend yield	2.00	%	2.00	%
Risk-free interest rate	2.00	%	2.00	%
Weighted average expected volatility	20.00	%	20.00	%
Weighted average expected life	6 years		6 years
Weighted average per share fair value of options	$3.08		$3.00

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 compensation expense to be recognized in future periods.

A summary of the Corporation’s stock option activity for the year ended December 31, 2014 and for three months ended March 31, 2015, is presented below.

Stock Options	Shares		Weighted Average Exercise Price	Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value (000s)
Outstanding at December 31, 2013	8,034,243		$18.37
Granted	1,389,452		$17.45
Exercised	(933,143	)	$13.77
Forfeited or expired	(643,214	)	$23.50
Outstanding at December 31, 2014	7,847,338		$18.34	5.79	$	23,986
Options exercisable at December 31, 2014	5,076,676		$19.96	4.41	$	14,953
Granted	1,348,504		$17.95
Exercised	(366,670	)	$13.84
Forfeited or expired	(495,890	)	$32.00
Outstanding at March 31, 2015	8,333,282		$17.71	6.60	$	22,821
Options exercisable at March 31, 2015	5,536,852		$18.02	5.28	$	18,637

The following table summarizes information about the Corporation’s nonvested stock option activity for the year ended December 31, 2014, and for the three months ended March 31, 2015.

Nonvested Stock Options	Shares		Weighted Average Grant Date Fair Value
Nonvested at December 31, 2013	3,110,523		$4.69
Granted	1,389,452		$3.00
Vested	(1,522,152	)	$4.92
Forfeited	(207,161	)	$4.38
Nonvested at December 31, 2014	2,770,662		$3.74
Granted	1,348,504		$3.08
Vested	(1,313,007	)	$4.31
Forfeited	(9,729	)	$3.35
Nonvested at March 31, 2015	2,796,430		$3.16

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, 2015, the intrinsic value of stock options exercised was $2 million. For the year ended December 31, 2014, the intrinsic value of stock options exercised was $4 million. The total fair value of stock options that vested was $6 million for the three months ended March 31, 2015 and $7 million for the year ended December 31, 2014. The Corporation recognized compensation expense for the vesting of stock options of $1 million and $2 million for the three months ended March 31, 2015 and 2014, respectively. For the full year 2014, the Corporation recognized compensation expense of $6 million for the vesting of stock options. At March 31, 2015, 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 fourth quarter 2018.

The following table summarizes information about the Corporation’s restricted stock awards activity for the year ended December 31, 2014, and for three months ended March 31, 2015.

Restricted Stock	Shares		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2013	1,511,765		$13.92
Granted	1,177,168		$17.35
Vested	(538,877	)	$14.12
Forfeited	(167,930	)	$15.26
Outstanding at December 31, 2014	1,982,126		$15.79
Granted	1,029,339		$16.77
Vested	(619,358	)	$15.52
Forfeited	(18,834	)	$16.13
Outstanding at March 31, 2015	2,373,273		$16.28

The Corporation amortizes the expense related to restricted stock awards as compensation expense over the vesting period specified in the grant. Restricted stock awards granted during 2014 and 2015 will vest ratably over a four year period. Expense for restricted stock awards of approximately $5 million and $3 million was recognized for the three months ended March 31, 2015 and 2014, respectively. The Corporation recognized approximately $10 million of expense for restricted stock awards for the full year 2014. Included in compensation expense for three months ended March 31, 2015 was approximately $700,000 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, 2015 that is expected to be recognized over the remaining requisite service periods that extend predominantly through fourth quarter 2018.

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, 2015

Investments, Debt and Equity Securities [Abstract]

Investment Securities

Investment Securities

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

March 31, 2015:	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
	($ in Thousands)
Investment securities available for sale:
U.S. Treasury securities	$	999	$	3	$	—		$	1,002
Obligations of state and political subdivisions (municipal securities)	501,679		22,912		(4		)	524,587
Residential mortgage-related securities:
Government-sponsored enterprise (“GSE”)	3,613,144		73,227		(11,257		)	3,675,114
Private-label	1,962		1		(10		)	1,953
GSE commercial mortgage-related securities	1,158,217		6,114		(15,075		)	1,149,256
Other securities (debt and equity)	6,338		60		—			6,398
Total investment securities available for sale	$	5,282,339	$	102,317	$	(26,346	)	$	5,358,310
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	$	438,047	$	9,482	$	(832	)	$	446,697
Total investment securities held to maturity	$	438,047	$	9,482	$	(832	)	$	446,697
December 31, 2014:	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
	($ in Thousands)
Investment securities available for sale:
U.S. Treasury securities	$	999	$	—	$	(1	)	$	998
Obligations of state and political subdivisions (municipal securities)	560,839		21,869		(29		)	582,679
Residential mortgage-related securities:
GSE	3,700,103		61,236		(30,550		)	3,730,789
Private-label	2,297		7		(10		)	2,294
GSE commercial mortgage-related securities	1,097,913		1,922		(25,942		)	1,073,893
Other securities (debt and equity)	6,108		51		—			6,159
Total investment securities available for sale	$	5,368,259	$	85,085	$	(56,532	)	$	5,396,812
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	$	404,455	$	9,444	$	(832	)	$	413,067
Total investment securities held to maturity	$	404,455	$	9,444	$	(832	)	$	413,067

The amortized cost and fair values of investment securities available for sale and held to maturity at March 31, 2015, 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	$	40,879	$	41,115		$	—	$	—
Due after one year through five years	233,433		245,483			2,253		2,291
Due after five years through ten years	234,102		244,730			122,372		124,896
Due after ten years	584		609			313,422		319,510
Total debt securities	508,998		531,937			438,047		446,697
Residential mortgage-related securities:
GSE	3,613,144		3,675,114			—		—
Private-label	1,962		1,953			—		—
GSE commercial mortgage-related securities	1,158,217		1,149,256			—		—
Equity securities	18		50			—		—
Total investment securities	$	5,282,339	$	5,358,310		$	438,047	$	446,697
Ratio of Fair Value to Amortized Cost			101.4		%			102.0		%

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 March 31, 2015.

	Less than 12 months						12 months or more						Total
March 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:
Obligations of state and political subdivisions (municipal securities)	2	$	(1	)	$	629	1	$	(3	)	$	186	$	(4	)	$	815
Residential mortgage-related securities:
GSE	22	(805		)	204,345		43	(10,452		)	1,060,452		(11,257		)	1,264,797
Private-label	1	(9		)	1,750		2	(1		)	24		(10		)	1,774
GSE commercial mortgage-related securities	4	(95		)	99,052		20	(14,980		)	455,874		(15,075		)	554,926
Total		$	(910	)	$	305,776		$	(25,436	)	$	1,516,536	$	(26,346	)	$	1,822,312
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	163	$	(568	)	$	73,163	21	$	(264	)	$	9,552	$	(832	)	$	82,715
Total		$	(568	)	$	73,163		$	(264	)	$	9,552	$	(832	)	$	82,715

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, 2014.

	Less than 12 months						12 months or more						Total
December 31, 2014	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	$	(1	)	$	998	—	$	—		$	—	$	(1	)	$	998
Obligations of state and political subdivisions (municipal securities)	6	(9		)	3,374		6	(20		)	2,133		(29		)	5,507
Residential mortgage-related securities:
GSE	16	(1,404		)	333,713		56	(29,146		)	1,256,533		(30,550		)	1,590,246
Private-label	1	(9		)	1,772		2	(1		)	27		(10		)	1,799
GSE commercial mortgage-related securities	9	(1,766		)	329,982		20	(24,176		)	460,425		(25,942		)	790,407
Total		$	(3,189	)	$	669,839		$	(53,343	)	$	1,719,118	$	(56,532	)	$	2,388,957
Investment securities held to maturity:
Obligations of state and political subdivisions (municipal securities)	74	$	(216	)	$	31,924	85	$	(616	)	$	38,915	$	(832	)	$	70,839
Total		$	(216	)	$	31,924		$	(616	)	$	38,915	$	(832	)	$	70,839

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. In addition, with regards to its debt securities, the Corporation may also evaluate payment structure, whether there are defaulted payments or expected defaults, prepayment speeds, and the value of any underlying collateral.

Based on the Corporation’s evaluation, management does not believe any unrealized loss at March 31, 2015 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 residential mortgage-related securities relate to private-label residential mortgage-related securities as well as residential mortgage-related securities issued by government-sponsored enterprises such as the Government National Mortgage Association (“GNMA”), the Federal National Mortgage Association (“FNMA”) and the Federal Home Loan Mortgage Corporation (“FHLMC”). The unrealized losses reported for commercial mortgage-related securities relate to securities issued by GNMA. 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 improvement in the unrealized loss position of the investment securities portfolio was due to a reduction in the overall level of interest rates from December 31, 2014 to March 31, 2015. Since December 31, 2014, the three-year and ten-year U.S. Treasury note rates declined approximately 20 basis points ("bp") and 25 bp, respectively.

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. The Corporation had FHLB stock of $118 million at both March 31, 2015 and December 31, 2014 and Federal Reserve Bank stock of $71 million at both March 31, 2015 and December 31, 2014.

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Goodwill and Other Intangible Assets

3 Months Ended

Mar. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other 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 2014, 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 increases in both the Corporation’s common stock price and in the overall bank common stock index (based on the NASDAQ Bank index), as well as the Corporation’s earnings per common share trend over the past year. Based on these assessments, management concluded that the 2014 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 date of the last impairment testing that have changed the Corporation's impairment assessment conclusion.

At March 31, 2015, the Corporation had goodwill of $969 million. There was an addition to the carrying amount of goodwill of approximately $40 million for the Ahmann & Martin Co. acquisition that occurred during the quarter ended March 31, 2015. See Note 2 for additional information on the Ahmann & Martin Co. acquisition.

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. There was an addition to the gross carrying amount of other intangibles of approximately $12 million for the customer relationships acquired with the Ahmann & Martin Co. acquisition that occurred during the quarter ended March 31, 2015. See Note 2 for additional information on the Ahmann & Martin Co. acquisition. 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, 2015			Year Ended December 31, 2014
	($ in Thousands)
Core deposit intangibles:
Gross carrying amount	$	36,230		$	36,230
Accumulated amortization	(34,875		)	(34,433		)
Net book value	$	1,355		$	1,797
Amortization during the period	$	442		$	2,868
Other intangibles:
Gross carrying amount	$	30,898		$	19,283
Accumulated amortization	(14,002		)	(13,643		)
Net book value	$	16,896		$	5,640
Additions during the period	$	11,615		$	—
Amortization during the period	$	359		$	879

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 13 for a discussion of the recourse provisions on sold residential mortgage loans. See Note 14 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, 2015			Year Ended December 31, 2014
	($ in Thousands)
Mortgage servicing rights:
Mortgage servicing rights at beginning of period	$	61,379		$	64,193
Additions	3,010			8,253
Amortization	(3,179		)	(11,067		)
Mortgage servicing rights at end of period	$	61,210		$	61,379
Valuation allowance at beginning of period	(1,234		)	(913		)
Additions, net	(243		)	(321		)
Valuation allowance at end of period	(1,477		)	(1,234		)
Mortgage servicing rights, net	$	59,733		$	60,145
Fair value of mortgage servicing rights	$	64,026		$	66,342
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	7,919,711			7,999,294
Mortgage servicing rights, net to servicing portfolio	0.75		%	0.75		%
Mortgage servicing rights expense (1)	$	3,422		$	11,388

(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, 2015. 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, 2015	$	962	$	1,299	$	8,643
Year ending December 31, 2016	281		1,696		9,596
Year ending December 31, 2017	112		1,663		7,778
Year ending December 31, 2018	—		1,633		6,338
Year ending December 31, 2019	—		1,334		5,195
Year ending December 31, 2020	—		1,218		4,276
Beyond 2020	—		8,053		19,384
Total Estimated Amortization Expense	$	1,355	$	16,896	$	61,210

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Goodwill and Other Intangible Assets (Goodwill Narrative) (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill	$ 968,774,000	$ 929,168,000
Ahmann & Martin Co. [Member]
Goodwill [Line Items]
Goodwill acquired	$ 40,000,000

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Short and Long-Term Funding (Components of Short-term and Long-term Funding) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Short-Term Funding
Federal funds purchased	$ 58,700	$ 109,770
Securities sold under agreements to repurchase	528,572	384,221
Federal funds purchased and securities sold under agreements to repurchase	587,272	493,991
FHLB advances	0	500,000
Commercial paper	75,265	74,297
Other short-term funding	75,265	574,297
Total short-term funding	662,537	1,068,288
Long-Term Funding
FHLB advances	2,500,251	3,000,260
Senior notes, at par	680,000	680,000
Subordinated notes, at par	250,000	250,000
Other long-term funding and capitalized costs	(326)	(143)
Total long-term funding	3,429,925	3,930,117
Total short and long-term funding	$ 4,092,462	$ 4,998,405

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Goodwill and Other Intangible Assets Estimated Future Amortization Expense (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Core Deposit Intangibles [Member]
Estimated future amortization expense
Nine Months Ending December 31, 2015	$ 962
Year ending December 31, 2016	281
Year ending December 31, 2017	112
Year ending December 31, 2018	0
Year ending December 31, 2019	0
Year ending December 31, 2020	0
Beyond 2020	0
Amortization Expense	1,355	1,797
Other Intangibles [Member]
Estimated future amortization expense
Nine Months Ending December 31, 2015	1,299
Year ending December 31, 2016	1,696
Year ending December 31, 2017	1,663
Year ending December 31, 2018	1,633
Year ending December 31, 2019	1,334
Year ending December 31, 2020	1,218
Beyond 2020	8,053
Amortization Expense	16,896	5,640
Mortgage Service Rights [Member]
Estimated future amortization expense
Nine Months Ending December 31, 2015	8,643
Year ending December 31, 2016	9,596
Year ending December 31, 2017	7,778
Year ending December 31, 2018	6,338
Year ending December 31, 2019	5,195
Year ending December 31, 2020	4,276
Beyond 2020	19,384
Amortization Expense	$ 61,210

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Balance Sheet Offsetting (Tables)

3 Months Ended

Mar. 31, 2015

Offsetting [Abstract]

Balance Sheet Offsetting of Derivative Assets and Liabilities

	Gross amounts recognized		Gross amounts offset in the balance sheet		Net amounts presented in the balance sheet		Gross amounts not offset
							in the balance sheet
							Financial instruments			Collateral			Net amount
March 31, 2015	($ in Thousands)
Derivative assets:
Interest rate-related instruments	$	143	$	—	$	143	$	(143	)	$	—		$	—
Derivative liabilities:
Interest rate-related instruments	$	40,348	$	—	$	40,348	$	(143	)	$	(30,481	)	$	9,724
December 31, 2014
Derivative assets:
Interest rate-related instruments	$	558	$	—	$	558	$	(558	)	$	—		$	—
Derivative liabilities:
Interest rate-related instruments	$	34,087	$	—	$	34,087	$	(558	)	$	(26,105	)	$	7,424

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Loans, Allowance for Credit Losses, and Credit Quality Changes in the Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Changes in the allowance for loan losses
Loans and Leases Receivable, Allowance, Beginning Balance	$ 266,302	$ 268,315
Provision for loan losses	4,500	13,000
Charge offs	(13,270)	(44,096)
Recoveries	7,736	29,083
Net charge offs	(5,534)	(15,013)
Loans and Leases Receivable, Allowance, Ending Balance	265,268	266,302
Changes in the allowance for unfunded commitments
Allowance for Credit Losses	290,168	291,202
Reserve for Off-balance Sheet Activities [Member]
Changes in the allowance for unfunded commitments
Balance at beginning of period	24,900	21,900
Provision for unfunded commitments	0	3,000
Balance at end of period	$ 24,900	$ 24,900

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Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities

3 Months Ended

Mar. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities

Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities

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) and derivative instruments (see Note 11). The following is a summary of lending-related commitments.

	March 31, 2015		December 31, 2014
	($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(1)(2)	$	6,362,769	$	6,884,411
Commercial letters of credit (1)	11,938		9,179
Standby letters of credit (3)	333,716		353,292

⁽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, 2015 or December 31, 2014.

⁽²⁾  Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 11.

⁽³⁾  The Corporation has established a liability of $3 million at March 31, 2015 compared to $4 million at December 31, 2014, 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 $25 million at both March 31, 2015 and December 31, 2014, and is included in accrued expenses and other liabilities on the consolidated balance sheets. See Note 7 for additional information on the allowance for unfunded commitments.

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 11. 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 low-income housing, small-business commercial real estate, new market tax credit projects, and historic tax credit projects to promote the revitalization of 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, 2015 was $41 million, compared to $27 million at December 31, 2014, included in other assets on the consolidated balance sheets. Related to these investments, the Corporation had remaining commitments to fund of $28 million at both March 31, 2015 and December 31, 2014.

Contingent Liabilities

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 current 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 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.

The U.S. Department of Housing and Urban Development (“HUD”) is investigating the Bank’s compliance with fair housing laws, particularly from the period 2008 to 2011. There are several possible outcomes from this matter, including administrative or court proceedings, or a conciliation agreement with HUD. The Corporation believes it has been in compliance in all material respects with all applicable laws and regulations related to fair housing. 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 investigation by HUD.

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.

Debt protection and identity protection products have recently received increased regulatory scrutiny, and it is possible that regulatory authorities could bring enforcement actions, including civil money penalties, or take other actions against the Corporation in regard to these legacy 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 this matter.

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 $800,000 and $5 million during the three months ended March 31, 2015 and the year ended December 31, 2014, respectively, and paid loss reimbursement or settlement claims of approximately $6,000 and $734,000 during the three months ended March 31, 2015 and the year ended December 31, 2014, respectively. The Corporation had a mortgage repurchase reserve for potential claims on loans previously sold of $2 million at March 31, 2015, compared to $3 million at December 31, 2014. Make whole requests during 2014 and the first three months of 2015 generally arose from loans sold during the period January 1, 2006 to December 31, 2014, which totaled $18.9 billion at the time of sale, and consisted primarily of loans sold to GSEs. As of March 31, 2015, approximately $7.5 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, 2015			For The Year Ended December 31, 2014
	($ in Thousands)
Balance at beginning of period	$	3,258		$	5,737
Repurchase provision expense	128			505
Adjustments to provision expense	(950		)	(2,250		)
(Charge offs) recoveries	45			(734		)
Balance at end of period	$	2,481		$	3,258

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, 2015 and December 31, 2014, there were approximately $52 million and $46 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, 2015 and December 31, 2014, there were $167 million and $178 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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New Accounting Pronouncements Adopted (Policies)

3 Months Ended

Mar. 31, 2015

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

New Accounting Pronouncements Adopted

In August 2014, the FASB issued an amendment to clarify how creditors are to classify certain government-guaranteed mortgage loans upon foreclosure. This amendment requires that a mortgage loan be derecognized and a separate other receivable be recognized upon foreclosure if the following conditions are met: (1) the loan has a government guarantee that is not separate from the loan before foreclosure and (2) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under the claim and (3) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. This amendment is effective for annual reporting periods, including interim periods within those annual periods, beginning after December 15, 2014. Entities may apply the amendments in this update either (a) prospectively to foreclosures that occur after the date of adoption or (b) modified retrospective transition using a cumulative-effect adjustment (through a reclassification to a separate other receivable) as of the beginning of the annual period of adoption. Prior periods should not be adjusted. The Corporation adopted the accounting standard on a prospective basis during the first quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity.

In June 2014, the FASB issued an amendment to clarify the current accounting and disclosures for certain repurchase agreements. The amendments in this update require two accounting changes: (1) change the accounting for repurchase-to-maturity transactions to secured borrowing accounting and (2) require separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty, which will result in secured borrowing accounting for the repurchase agreement. The amendments in this update also require additional disclosures for certain transactions on the transfer of financial assets, as well as new disclosures for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings. This amendment is effective for public business entities for the first interim or annual period beginning after December 15, 2014. Early application is prohibited. The Corporation adopted the accounting standard during the first quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity.

In January 2014, the FASB issued an amendment to clarify that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar agreement. In addition, the amendments require interim and annual disclosure of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure in accordance with local requirements of the applicable jurisdiction. This amendment is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. An entity can elect to adopt the amendments using either a modified retrospective method or a prospective transition method. The Corporation adopted the accounting standard using the prospective transition method during the first quarter of 2015, as required, with no material impact on its results of operations, financial position, or liquidity.

In January 2014, the FASB issued an amendment which permits reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). For those investments in qualified affordable housing projects not accounted for using the proportional method, the investment should be accounted for as an equity method investment or a cost method investment. The decision to apply the proportional amortization method of accounting is an accounting policy decision that should be applied consistently to all qualifying affordable housing project investments rather than a decision to be applied to individual investments. This amendment should be applied retrospectively to all periods presented. A reporting entity that uses the effective yield method to account for its investments in qualified affordable housing projects before the date of adoption may continue to apply the effective yield method for those preexisting investments. This amendment is effective for fiscal years, and interim periods within those years, beginning after December 15, 2014. The Corporation made an accounting policy election to use the proportional amortization method for investments in qualified affordable housing projects during the first quarter of 2015, which had no material impact on the results of operations, financial position, or liquidity.

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Investment Securities (Details Textuals) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Federal Home Loan Bank Stock	$ 118	$ 118
Federal Reserve Bank Stock	$ 71	$ 71

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Earnings Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Calculations for basic and diluted earnings per common share
Net income	$ 46,672	$ 45,199
Preferred stock dividends	(1,228)	(1,244)
Net income available to common equity	45,444	43,955
Common shareholder dividends	(15,166)	(14,488)
Dividends on unvested share-based payment awards	(114)	(151)
Undistributed earnings	30,164	29,316
Undistributed earnings allocated to common shareholders	29,886	29,126
Undistributed earnings allocated to unvested share-based payment awards	278	190
Undistributed earnings	30,164	29,316
Basic
Distributed earnings to common shareholders	15,166	14,488
Undistributed earnings allocated to common shareholders	29,886	29,126
Total common shareholders earnings, basic	45,052	43,614
Diluted
Distributed earnings to common shareholders	15,166	14,488
Undistributed earnings allocated to common shareholders	29,886	29,126
Total common shareholders earnings, diluted	$ 45,052	$ 43,614
Weighted average common shares outstanding (in shares)	150,070,000	161,467,000
Effect of dilutive common stock awards (in shares)	1,094,000	721,000
Diluted weighted average common shares outstanding (in shares)	151,164,000	162,188,000
Basic earnings per common share (in usd per share)	$ 0.30	$ 0.27
Diluted earnings per common share (in usd per share)	$ 0.30	$ 0.27
Earnings Per Share (Textuals) [Abstract]
Number of antidilutive stock options excluded from the computation of diluted earnings per share	2,000,000	3,000,000

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Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 46,672	$ 45,199
Investment securities available for sale:
Net unrealized gains	47,418	20,627
Reclassification adjustment for net gains realized in net income	0	(378)
Income tax expense	(18,105)	(7,786)
Other comprehensive income on investment securities available for sale	29,313	12,463
Defined benefit pension and postretirement obligations:
Amortization of prior service cost	13	15
Amortization of actuarial losses	532	316
Income tax expense	(208)	(127)
Other comprehensive income on pension and postretirement obligations	337	204
Total other comprehensive income	29,650	12,667
Comprehensive income	$ 76,322	$ 57,866

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Acquisition

3 Months Ended

Mar. 31, 2015

Business Combinations [Abstract]

Acquisition

Acquisition

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.

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Loans, Allowance for Credit Losses, and Credit Quality Loans Modified in a Troubled Debt Restructuring (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 loan	Mar. 31, 2014 loan
Financing Receivable, Modifications [Line Items]
Number of Loans	77	68
Recorded Investment	$ 11,409	$ 14,082
Unpaid Principal Balance	11,598	18,833
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2	8
Recorded Investment	196	3,446
Unpaid Principal Balance	208	7,218
Commercial Real Estate Owner Occupied Portfolio [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	5	4
Recorded Investment	3,585	5,298
Unpaid Principal Balance	3,641	5,781
Commercial Real Estate Investor Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	4	4
Recorded Investment	3,030	1,643
Unpaid Principal Balance	3,042	1,676
Home Equity Port Folio Segments [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	36	30
Recorded Investment	1,782	935
Unpaid Principal Balance	1,843	1,218
Installment and Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	0	1
Recorded Investment	0	10
Unpaid Principal Balance	0	20
Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	30	21
Recorded Investment	2,816	2,750
Unpaid Principal Balance	$ 2,864	$ 2,920

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Retirement Plans Components of Net Periodic Benefit Cost (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Retirement Plans (Textuals) [Abstract]
Retirement eligible age for participation	55 years
Years of service required for eligibility in plan	5 years
Pension Plans, Defined Benefit [Member]
Net period benefit cost for the pension and postretirement plans
Service cost	$ 3,063	$ 2,975	$ 11,058
Interest cost	1,642	1,790	7,132
Expected return on plan assets	(5,350)	(4,855)	(19,922)
Amortization of prior service cost	13	15	58
Amortization of actuarial gain (loss)	532	325	1,384
Total net periodic benefit cost	(100)	250	(290)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Net period benefit cost for the pension and postretirement plans
Interest cost	35	39	150
Amortization of actuarial gain (loss)	0	(9)	(35)
Total net periodic benefit cost	$ 35	$ 30	$ 115

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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 22,462	$ 20,637
Effective income tax rate	32.49%	31.35%

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Earnings Per Common Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Calculations for basic and diluted earnings per common share

	For the Three Months Ended March 31,
	2015			2014
	(In Thousands, except per share data)
Net income	$	46,672		$	45,199
Preferred stock dividends	(1,228		)	(1,244		)
Net income available to common equity	$	45,444		$	43,955
Common shareholder dividends	(15,166		)	(14,488		)
Dividends on unvested share-based payment awards	(114		)	(151		)
Undistributed earnings	$	30,164		$	29,316
Undistributed earnings allocated to common shareholders	29,886			29,126
Undistributed earnings allocated to unvested share-based payment awards	278			190
Undistributed earnings	$	30,164		$	29,316
Basic
Distributed earnings to common shareholders	$	15,166		$	14,488
Undistributed earnings allocated to common shareholders	29,886			29,126
Total common shareholders earnings, basic	$	45,052		$	43,614
Diluted
Distributed earnings to common shareholders	$	15,166		$	14,488
Undistributed earnings allocated to common shareholders	29,886			29,126
Total common shareholders earnings, diluted	$	45,052		$	43,614
Weighted average common shares outstanding	150,070			161,467
Effect of dilutive common stock awards	1,094			721
Diluted weighted average common shares outstanding	151,164			162,188
Basic earnings per common share	$	0.30		$	0.27
Diluted earnings per common share	$	0.30		$	0.27

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Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities Summary of Lending Related and Other Commitments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Summary of lending-related and other commitments
Standby letters of credit Fair value	$ 3,373	$ 3,542
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	6,362,769	6,884,411
Commercial Letters Of Credit [Member]
Summary of lending-related and other commitments
Lending related commitments	11,938	9,179
Standby Letters of Credit [Member]
Summary of lending-related and other commitments
Lending related commitments	333,716	353,292
Standby letters of credit Fair value	$ 3,000	$ 4,000

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Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Selected segment information

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, 2015
Net interest income	$	75,691		$	86,357		$	5,765		$	167,813
Noninterest income	12,613			65,514			1,949			80,076
Total revenue	88,304			151,871			7,714			247,889
Credit provision *	9,526			7,071			(12,097		)	4,500
Noninterest expense	34,460			118,543			21,252			174,255
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 (ROT1CE) **	12.5		%	10.7		%	(1.1		)%	10.2		%
Three Months Ended March 31, 2014
Net interest income	$	74,065		$	72,251		$	18,657		$	164,973
Noninterest income	11,854			55,829			5,838			73,521
Total revenue	85,919			128,080			24,495			238,494
Credit provision *	13,032			4,948			(12,980		)	5,000
Noninterest expense	35,721			111,199			20,738			167,658
Income before income taxes	37,166			11,933			16,737			65,836
Income tax expense	13,008			4,176			3,453			20,637
Net income	$	24,158		$	7,757		$	13,284		$	45,199
Return on average allocated capital (ROT1CE) **	11.0		%	5.9		%	10.2		%	9.4		%
Segment Balance Sheet Data
($ in Thousands)	Corporate and Commercial Specialty			Community, Consumer, and Business			Risk Management and Shared Services			Consolidated Total
Average Balances for 1Q 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 (T1CE) **	$	942,764		$	647,375		$	214,078		$	1,804,217
Average Balances for 1Q 2014
Average earning assets	$	8,850,984		$	7,230,394		$	5,811,125		$	21,892,503
Average loans	8,843,070			7,230,394			91,153			16,164,617
Average deposits	5,241,027			9,539,887			2,209,358			16,990,272
Average allocated capital (T1CE) **	$	886,927		$	535,752		$	476,856		$	1,899,535

* 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 Tier 1 common equity 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 ROT1CE reflects return on average allocated Tier 1 common equity ("T1CE"). The ROT1CE 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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Balance Sheet Offsetting

3 Months Ended

Mar. 31, 2015

Offsetting [Abstract]

Balance Sheet Offsetting

Balance Sheet Offsetting

Interest Rate-Related Instruments (“Interest Agreements”)

The Corporation enters into interest rate-related instruments to facilitate the interest rate risk management strategies of commercial customers. The Corporation mitigates this risk by entering into equal and offsetting interest rate-related instruments with highly rated third party financial institutions. The interest agreements are free-standing derivatives and are recorded at fair value in the Corporation’s consolidated balance sheet. The Corporation is party to master netting arrangements with its financial institution counterparties; however, the Corporation does not offset assets and liabilities under these arrangements for financial statement presentation purposes. The master netting arrangements provide for a single net settlement of all interest agreements, as well as collateral, in the event of default on, or termination of, any one contract. Collateral, usually in the form of investment securities and cash, is posted by the counterparty with net liability positions in accordance with contract thresholds. See Note 11 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. 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. As a result, these repurchase agreements are accounted for as collateralized financing arrangements (i.e., secured borrowings) and not as a sale and subsequent repurchase of securities. The obligation to repurchase the securities is reflected as a liability in the Corporation’s consolidated balance sheet, 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). The right of setoff 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.

The following table presents the assets and liabilities subject to an enforceable master netting arrangement as of March 31, 2015 and December 31, 2014. The swap 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 offset in the balance sheet		Net amounts presented in the balance sheet		Gross amounts not offset
							in the balance sheet
							Financial instruments			Collateral			Net amount
March 31, 2015	($ in Thousands)
Derivative assets:
Interest rate-related instruments	$	143	$	—	$	143	$	(143	)	$	—		$	—
Derivative liabilities:
Interest rate-related instruments	$	40,348	$	—	$	40,348	$	(143	)	$	(30,481	)	$	9,724
December 31, 2014
Derivative assets:
Interest rate-related instruments	$	558	$	—	$	558	$	(558	)	$	—		$	—
Derivative liabilities:
Interest rate-related instruments	$	34,087	$	—	$	34,087	$	(558	)	$	(26,105	)	$	7,424