MB Financial 10-Q 9 May 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	May 09, 2017
Document and Entity Information
Entity Registrant Name	MB FINANCIAL INC /MD
Entity Central Index Key	1,139,812
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		83,853,175
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 368,078	$ 364,783
Interest earning deposits with banks	102,328	98,686
Total cash and cash equivalents	470,406	463,469
Investment securities:
Securities available for sale, at fair value	1,657,950	1,696,195
Securities held to maturity, at amortized cost ($1,083,998 fair value at March 31, 2017 and $1,093,740 at December 31, 2016)	1,056,008	1,069,750
Non-marketable securities - FHLB and FRB stock	144,427	143,276
Total investment securities	2,858,385	2,909,221
Loans held for sale	493,261	716,883
Loans:
Total loans, excluding purchased credit-impaired loans	12,789,667	12,605,726
Purchased credit-impaired loans	168,814	163,077
Total loans	12,958,481	12,768,803
Less: Allowance for loan and lease losses	144,170	139,366
Net loans	12,814,311	12,629,437
Lease investments, net	315,523	311,327
Premises and equipment, net	290,767	293,910
Cash surrender value of life insurance	202,233	200,945
Goodwill	999,925	1,001,038
Other intangibles	60,869	62,959
Mortgage servicing rights, at fair value	251,498	238,011
Other real estate owned, net	14,706	26,279
Other real estate owned related to FDIC-assisted transactions	3,864	5,006
Other assets	370,314	443,832
Total assets	19,146,062	19,302,317
Deposits:
Non-interest bearing	6,211,173	6,408,169
Interest bearing	7,788,210	7,702,279
Total deposits	13,999,383	14,110,448
Short-term borrowings	1,550,628	1,569,288
Long-term borrowings	315,618	311,790
Junior subordinated notes issued to capital trusts	210,769	210,668
Accrued expenses and other liabilities	453,236	520,914
Total liabilities	16,529,634	16,723,108
STOCKHOLDERS’ EQUITY
Preferred stock, ($0.01 par value, authorized 10,000,000 shares at March 31, 2017 and December 31, 2016; Series A, 8% perpetual non-cumulative, 4,000,000 shares issued and outstanding at March 31, 2017 and December 31, 2016, $25 liquidation value; Series B, 8% cumulative voting convertible, 125 shares issued and outstanding at March 31, 2017 and December 31, 2016)	115,572	115,572
Common stock, ($0.01 par value; authorized 120,000,000 shares at March 31, 2017 and December 31, 2016; issued 85,686,343 shares at March 31, 2017 and 85,630,748 shares at December 31, 2016)	857	856
Additional paid-in capital	1,675,956	1,678,826
Retained earnings	875,295	838,892
Accumulated other comprehensive income	8,415	5,190
Less: 1,853,695 and 1,905,479 shares of treasury common stock, at cost, at March 31, 2017 and December 31, 2016, respectively	(59,667)	(60,384)
Controlling interest stockholders’ equity	2,616,428	2,578,952
Non-controlling interest	0	257
Total stockholders’ equity	2,616,428	2,579,209
Total liabilities and stockholders’ equity	$ 19,146,062	$ 19,302,317

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Securities held to maturity, at amortized cost, fair value	$ 1,083,998	$ 1,093,740
Preferred stock, par or stated value per share (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	120,000,000	120,000,000
Common stock, issued shares	85,686,343	85,630,748
Treasury stock, shares	1,853,695	1,905,479
Series A Preferred Stock
Preferred stock, dividend rate (percent)	8.00%	8.00%
Preferred stock, shares issued	4,000,000	4,000,000
Preferred stock, shares outstanding	4,000,000	4,000,000
Preferred stock, liquidation preference per share (in dollars per share)	$ 25	$ 25
Series B Preferred Stock
Preferred stock, dividend rate (percent)	8.00%	8.00%
Preferred stock, shares issued	125	125
Preferred stock, shares outstanding	125	125
Preferred stock, liquidation preference per share (in dollars per share)	$ 1,000	$ 1,000

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Loans:
Taxable		$ 133,737	$ 104,923
Nontaxable		2,880	2,586
Investment securities:
Taxable		9,122	9,566
Nontaxable		9,973	10,776
Other interest earning accounts		199	141
Total interest income		155,911	127,992
Interest expense:
Deposits		7,475	5,622
Short-term borrowings		2,380	721
Long-term borrowings and junior subordinated notes		3,013	2,345
Total interest expense		12,868	8,688
Net interest income		143,043	119,304
Provision for credit losses		3,734	7,563
Net interest income after provision for credit losses		139,309	111,741
Non-interest income:
Mortgage banking revenue		27,779	27,482
Lease financing revenue, net		21,418	19,046
Commercial deposit and treasury management fees		14,689	11,878
Trust and asset management fees		8,520	7,950
Card fees		4,566	3,525
Capital markets and international banking fees		3,253	3,227
Consumer and other deposit service fees		3,363	3,025
Brokerage fees		1,125	1,158
Loan service fees		1,969	1,752
Increase in cash surrender value of life insurance		1,288	854
Net gain on investment securities		231	0
Net loss on disposal of other assets		(123)	(48)
Other operating income		3,695	1,844
Total non-interest income		91,773	81,693
Non-interest expenses:
Salaries and employee benefits expense		101,551	85,591
Occupancy and equipment expense		15,044	13,260
Computer services and telecommunication expense		9,440	9,055
Advertising and marketing expense		3,161	2,878
Professional and legal expense		2,691	2,589
Other intangibles amortization expense		2,090	1,626
Branch exit and facilities impairment charges		(682)	44
Net loss (gain) recognized on other real estate owned and other related expenses		844	(346)
Other operating expenses		21,526	21,103
Total non-interest expenses	[1]	155,665	135,800
Income before income taxes		75,417	57,634
Income tax expense		20,880	18,520
Net income		54,537	39,114
Dividends on preferred shares		2,003	2,000
Net income available to common stockholders		$ 52,534	$ 37,114
Common share data:
Basic earnings per common share (in dollars per share)		$ 0.63	$ 0.51
Diluted earnings per common share (in dollars per share)		$ 0.62	$ 0.50
Weighted average common shares outstanding for basic earnings per common share (in shares)		83,662,430	73,330,731
Diluted weighted average common shares outstanding for diluted earnings per common share (in shares)		84,778,130	73,966,935
[1]	Includes merger related and repositioning expenses of $258 thousand and $3.3 million in the Banking Segment for the three months ended March 31, 2017 and 2016, respectively.

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 54,537	$ 39,114
Unrealized holding gains on investment securities, net of reclassification adjustments	6,054	15,576
Reclassification adjustment for amortization of unrealized gains on investment securities transferred to held to maturity from available for sale	(473)	(803)
Reclassification adjustments for gains included in net income	(231)	0
Other comprehensive income, before tax	5,350	14,773
Income tax expense related to items of other comprehensive income	(2,125)	(5,863)
Other comprehensive income, net of tax	3,225	8,910
Comprehensive income	$ 57,762	$ 48,024

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income, Net of Tax	Treasury Stock	Non-controlling Interest
Beginning balance at Dec. 31, 2015	$ 2,087,284	$ 115,280	$ 756	$ 1,280,870	$ 731,812	$ 15,777	$ (58,504)	$ 1,293
Increase (Decrease) in Stockholders' Equity
Net income	39,211				39,114			97
Other comprehensive income, net of tax	8,910					8,910
Cash dividends declared on preferred shares	(2,000)				(2,000)
Cash dividends declared on common shares ($0.17 and $0.19 per share in 2016 and 2017, respectively)	(12,654)				(12,654)
Restricted common stock activity, net of tax	1			(698)			699
Stock option activity, net of tax	17			17
Repurchase of common shares in connection with employee benefit plans and held in trust for deferred compensation plan	(1,860)			198			(2,058)
Stock-based compensation expense	4,051			4,051
Distributions to non-controlling interest	(75)							(75)
Ending balance at Mar. 31, 2016	2,122,885	115,280	756	1,284,438	756,272	24,687	(59,863)	1,315
Beginning balance at Dec. 31, 2016	2,579,209	115,572	856	1,678,826	838,892	5,190	(60,384)	257
Increase (Decrease) in Stockholders' Equity
Net income	54,537				54,537
Other comprehensive income, net of tax	3,225					3,225
Cash dividends declared on preferred shares	(2,003)				(2,003)
Cash dividends declared on common shares ($0.17 and $0.19 per share in 2016 and 2017, respectively)	(16,131)				(16,131)
Restricted common stock activity, net of tax	(3,321)			(6,870)			3,549
Stock option activity, net of tax	(199)		1	(200)
Repurchase of common shares in connection with employee benefit plans and held in trust for deferred compensation plan	(2,543)			289			(2,832)
Stock-based compensation expense	4,481			4,481
Purchase of additional investment in subsidiary from minority owners	(827)			(570)				(257)
Ending balance at Mar. 31, 2017	$ 2,616,428	$ 115,572	$ 857	$ 1,675,956	$ 875,295	$ 8,415	$ (59,667)	$ 0

CONSOLIDATED STATEMENTS OF CHA7

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.19	$ 0.17

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows From Operating Activities
Net income	$ 54,537	$ 39,114
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment and leased equipment	21,797	17,302
Branch exit and facilities impairment charges	(682)	44
Compensation expense for share-based payment plans	4,481	4,051
Net (gain) loss on sales of premises and equipment and leased equipment	(576)	121
Amortization of other intangibles	2,090	1,626
Provision for credit losses	3,734	7,563
Deferred income tax expense	18,304	11,751
Amortization of premiums and discounts on investment securities, net	10,738	12,059
Accretion of discounts on loans, net	(7,158)	(7,156)
Net gain on investment securities	(231)	0
Proceeds from sale of loans held for sale	1,305,445	1,365,630
Origination of loans held for sale	(1,073,357)	(1,241,245)
Net gain on sale of loans held for sale	(4,052)	(10,176)
Change in fair value of mortgage servicing rights	2,660	34,372
Net loss (gain) on other real estate owned	607	(483)
Increase in cash surrender value of life insurance	(1,288)	(854)
Decrease (increase) in other assets, net	52,415	(57,188)
Decrease in other liabilities, net	(97,061)	(9,867)
Net cash provided by operating activities	292,403	166,664
Cash Flows From Investing Activities
Proceeds from sales of investment securities available for sale	9,911	842
Proceeds from maturities and calls of investment securities available for sale	71,539	62,891
Purchases of investment securities available for sale	(45,791)	(3,857)
Proceeds from maturities and calls of investment securities held to maturity	31,896	44,100
Purchases of investment securities held to maturity	(15,150)	(9,513)
Purchases of non-marketable securities - FHLB and FRB stock	(53,307)	(7,517)
Redemption of non-marketable securities - FHLB and FRB stock	52,156	0
Net increase in loans	(179,104)	(163,704)
Purchases of mortgage servicing rights	(496)	(154)
Purchases of premises and equipment and leased equipment	(28,361)	(21,513)
Proceeds from sales of premises and equipment and leased equipment	5,976	1,185
Proceeds from sale of other real estate owned	11,324	5,151
Proceeds from sale of other real estate owned related to FDIC-assisted transactions	1,420	1,085
Purchase of additional investment in subsidiary from minority owners	(827)	0
Net proceeds from FDIC related covered assets	(434)	(1,593)
Net cash used in investing activities	(139,248)	(92,597)
Cash Flows From Financing Activities
Net (decrease) increase in deposits	(111,065)	28,611
Proceeds from short-term borrowings - FHLB advances	1,000,000	450,000
Principal paid on short-term borrowings - FHLB advances	(1,050,000)	(550,000)
Net increase in short-term borrowings	(43,660)	(21,636)
Proceeds from long-term borrowings	89,060	86,070
Principal paid on long-term borrowings	(10,232)	(46,729)
Treasury stock transactions, net	(2,543)	(1,860)
Stock options exercised	610	55
Dividends paid on preferred stock	(2,003)	(2,000)
Dividends paid on common stock	(16,385)	(12,502)
Net cash used in financing activities	(146,218)	(69,991)
Net increase in cash and cash equivalents	6,937	4,076
Cash and cash equivalents:
Beginning of period	463,469	381,441
End of period	470,406	385,517
Cash payments for:
Interest paid to depositors and on other borrowed funds	12,687	8,734
Income tax payments, net	1,700	1,832
Supplemental Schedule of Noncash Investing Activities:
Investment securities held to maturity purchased not settled	6,386	581
Loans transferred to other real estate owned	350	1,270
Loans transferred to other real estate owned related to FDIC-assisted transactions	0	830
Loans transferred to repossessed assets	489	337
Operating leases rewritten as direct finance leases included as loans	1,339	137
Long-term borrowings transferred to short-term borrowings	75,000	0
Adjustments to noncash assets previously acquired:
Loans	1,846	0
Goodwill	(1,113)	0
Other assets	(733)	0
Total adjustments to noncash assets previously acquired	$ 0	$ 0

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation These unaudited consolidated financial statements include the accounts of MB Financial, Inc., a Maryland corporation (the “Company”), and its subsidiaries, including its wholly owned national bank subsidiary, MB Financial Bank, N.A. (“MB Financial Bank”), based in Chicago, Illinois. In the opinion of management, all normal recurring adjustments necessary for a fair presentation of the financial condition, results of operations and cash flows for the interim periods have been made. The results of operations for the three months ended March 31, 2017 are not necessarily indicative of the results to be expected for the entire fiscal year. These unaudited interim financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and industry practice. Certain information in footnote disclosure normally included in financial statements prepared in accordance with U.S. GAAP and industry practice has been condensed or omitted pursuant to rules and regulations of the Securities and Exchange Commission. These financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 . The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions which affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements, as well as the reported amounts of income and expenses during the reported periods. Actual results could differ from those estimates. Certain prior period amounts have been reclassified to conform to current period presentation. These reclassifications did not result in any changes to previously reported net income or stockholders’ equity.

New Authoritative Accounting Gu

New Authoritative Accounting Guidance	3 Months Ended
	Mar. 31, 2017
Accounting Changes and Error Corrections [Abstract]
New Authoritative Accounting Guidance	New Authoritative Accounting Guidance ASC Topic 805 "Business Combinations." New authoritative accounting guidance under ASC Topic 805 "Business Combinations" amends prior guidance to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The new authoritative guidance will be effective for reporting periods after January 1, 2018. This new authoritative guidance is not expected to have a significant impact on the Company's statements of operations or financial condition. ASC Topic 606 "Revenue from Contracts with Customers." New authoritative accounting guidance under ASC Topic 606, "Revenue from Contracts with Customers" amended prior guidance to require an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services and to provide clarification on identifying performance obligations and licensing implementation guidance. The new authoritative guidance was initially effective for reporting periods after January 1, 2017 but was deferred to January 1, 2018. The Company's revenue is comprised of interest income on financial assets, which is excluded from the scope of this new guidance, and non-interest income. The Company expects this new guidance will require it to change how certain recurring revenue streams are recognized within trust and asset management fees but does not expect these changes to have a significant impact on its statements of operations or financial condition. The Company continues to evaluate the impact of this guidance on other components of non-interest income. The Company expects to adopt this new guidance on January 1, 2018 with a cumulative effect adjustment to opening retained earnings, if such adjustment is deemed to be significant. ASC Topic 825 "Financial Instruments." New authoritative accounting guidance under ASC Topic 825 "Financial Instruments" amended prior guidance to require equity investments (except those accounted for under the equity method of accounting) to be measured at fair value with changes in fair value recognized in net income. An entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer. The new guidance simplifies the impairment assessment of equity investments without readily determinable fair values, requires public entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from changes in the instrument-specific credit risk when the entity has selected the fair value option for financial instruments and requires separate presentation of financial assets and liabilities by measurement category and form of financial asset. The new authoritative guidance will be effective for reporting periods after January 1, 2018 and is not expected to have a significant impact on the Company's statements of operations or financial condition. ASC Topic 405 "Liabilities-Extinguishment of Liabilities." New authoritative accounting guidance under ASC Topic 405, "Liabilities-Extinguishment of Liabilities" amended prior guidance to clarify that liabilities related to the sale of prepaid store-value products within the scope of this guidance are financial liabilities and that breakage for those liabilities are to be accounted for consistent with the breakage guidance in ASC Topic 606 "Revenue from Contracts with Customers." The new authoritative guidance will be effective for reporting periods after January 1, 2018. The Company is evaluating the new guidance but does not expect it to have a significant impact on the Company's statements of operations or financial condition. ASC Topic 842 "Leases." New authoritative accounting guidance under ASC Topic 842 "Leases" amended prior guidance to require lessees to recognize the assets and liabilities arising from all leases on the balance sheet. The new authoritative guidance defines a lease as a contract, or part of a contract, that conveys the right to control the use of identified property, plant, or equipment (an identified asset) for a period of time in exchange for consideration. In addition, the qualifications for a sale and leaseback transaction have been amended. The new authoritative guidance also requires qualitative and quantitative disclosures by lessees and lessors to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The new authoritative guidance will be effective for reporting periods after January 1, 2019. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition. The Company expects an increase in assets and liabilities as a result of recording additional lease contracts where the Company is lessee. ASC Topic 815 "Derivatives and Hedging." New authoritative accounting guidance under ASC Topic 815 "Derivatives and Hedging" amended prior guidance to clarify that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument does not, in and of itself, require dedesignation of that hedging relationship provided that all other hedge accounting criteria continue to be met. An entity has an option to apply the amendments in this new authoritative guidance on either a prospective basis or a modified retrospective basis. The Company adopted this new authoritative guidance on January 1, 2017, and it did not have a significant impact on the Company's statements of operations or financial condition. New authoritative accounting guidance under ASC Topic 815 "Derivatives and Hedging" amended prior guidance to clarify what steps are required when assessing whether the economic characteristics and risks of call (put) options are clearly and closely related to the economic characteristics and risks of their debt hosts, which is one of the criteria for bifurcating an embedded derivative. An entity is required to consider whether (1) the payoff is adjusted based on changes in an index, (2) the payoff is indexed to an underlying other than interest rates or credit risk, (3) the debt involves a substantial premium or discount, and (4) the call (put) option is contingently exercisable. An entity should apply this new authoritative guidance on a modified retrospective basis to existing debt instruments as of the beginning of the fiscal year for which the amendments are effective. The Company adopted this new authoritative guidance on January 1, 2017, and it did not have a significant impact on the Company's statements of operations or financial condition. ASC Topic 323 "Investment - Equity Method and Joint Ventures." New authoritative accounting guidance under ASC Topic 323 "Investment - Equity Method and Joint Ventures" amended prior guidance to eliminate the requirement to retroactively adopt the equity method of accounting as a result of an increase in the level of ownership interest or degree of influence. The new authoritative guidance required that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. The Company adopted this new authoritative guidance on January 1, 2017, and it did not have an impact on the Company's statements of operations or financial condition. ASC Topic 718 "Compensation - Stock Compensation." New authoritative accounting guidance under ASC Topic 718 "Compensation - Stock Compensation" amended prior guidance on several aspects, including the income tax consequences, classification of awards as either equity or liability, and classification on the statement of cash flows. The new authoritative guidance allows for all excess tax benefits and tax deficiencies to be recognized as income tax benefit or expense in the income statement. The tax effects of exercised or vested awards should be treated as discrete items in the reporting period in which they occur. An entity also should recognize excess tax benefits regardless of whether the benefit reduces taxes payable in the current period. For the statement of cash flows, excess tax benefits should be classified along with other income tax cash flows as an operating activity, and cash paid by an employer when directly withholding shares for tax withholding purposes should be classified as a financing activity. The new authoritative guidance also allows an entity to make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures when they occur. In addition, the threshold to qualify for equity classification permits withholding up to the maximum statutory tax rates in the applicable jurisdictions. The Company early adopted the new guidance in the third quarter of 2016. The Company has also elected to account for forfeitures when they occur. ASC Topic 326 "Financial Instruments - Credit Losses." New authoritative accounting guidance under ASC Topic 326 " Financial Instruments - Credit Losses " amended the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information for credit loss estimates. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The new authoritative guidance also requires a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected (net of the allowance for credit losses). In addition, the credit losses relating to available-for-sale debt securities should be recorded through an allowance for credit losses rather than a write-down. The new authoritative guidance will be effective for reporting periods after January 1, 2020. The Company is evaluating the new guidance and expects it to have an impact on the Company's statements of operations and financial condition, the significance of which is not yet known. Due to the significant differences in the new authoritative guidance from the existing GAAP, the implementation of this guidance may result in material changes in our accounting for credit losses on the financial instruments. ASC Topic 230 "Statement of Cash Flows." New authoritative accounting guidance under ASC Topic 230 "Statement of Cash Flows" addresses eight specific cash flow classification issues with the objective of reducing the existing diversity in practice. The new authoritative guidance will be effective for reporting periods after January 1, 2018. This new authoritative guidance is not expected to have a significant impact on the Company's statements of operations or financial condition. New authoritative accounting guidance under ASC Topic 230 "Statement of Cash Flows" amends prior guidance to require an entity to include amounts generally described as restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning of period and end of period total amounts shown on the statement of cash flows. The new authoritative guidance will be effective for reporting periods after January 1, 2018. This new authoritative guidance is not expected to have a significant impact on the Company's statements of operations or financial condition. ASC Topic 740 "Income Taxes." New authoritative accounting guidance under ASC Topic 740 "Income Taxes" amends prior guidance to require an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The new authoritative guidance will be effective for reporting periods after January 1, 2018. The Company is evaluating the new guidance and its impact on the Company's statements of operations or financial condition. ASC Topic 350 "Intangibles-Goodwill and Other." New authoritative accounting guidance under ASC Topic 350 "Intangibles-Goodwill and Other" amends prior guidance to eliminate Step 2 from the goodwill impairment test and require an entity to perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new authoritative guidance will be effective for reporting periods after January 1, 2020. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition. ASC Topic 610 "Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets." New authoritative accounting guidance under ASC Topic 610 "Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets" amends prior guidance to clarify the scope of Subtopic 610-20 by defining in substance nonfinancial assets and to add guidance for partial sales of nonfinancial assets. The new authoritative guidance will be effective for reporting periods after January 1, 2018. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition. ASC Topic 310 "Receivables - Nonrefundable Fees and Other Costs." New authoritative accounting guidance under ASC Topic 610 "Receivables - Nonrefundable Fees and Other Costs" amends prior guidance by shortening the amortization period for certain callable debt securities held at a premium requiring the premium to be amortized to the earliest call date. The new authoritative guidance will be effective for reporting periods after January 1, 2019 with early adoption permitted. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition.

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share Earnings per common share is computed using the two-class method. Basic earnings per common share is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding during the applicable period, excluding outstanding participating securities. Participating securities include non-vested restricted stock awards and restricted stock units, though no actual shares of common stock related to restricted stock units are issued until the settlement of such units, to the extent holders of these securities receive non-forfeitable dividends or dividend equivalents at the same rate as holders of the Company's common stock. Diluted earnings per common share is computed using the weighted-average number of shares determined for the basic earnings per common share computation plus the dilutive effect of stock compensation using the treasury stock method. The following table presents a reconciliation of the number of shares used in the calculation of basic and diluted earnings per common share (amounts in thousands, except share and per share data). Three Months Ended March 31, 2017 2016 Distributed earnings allocated to common stock $ 16,131 $ 12,654 Undistributed earnings 38,406 26,460 Net income 54,537 39,114 Less: preferred stock dividends 2,003 2,000 Net income available to common stockholders for basic earnings per common share 52,534 37,114 Plus: preferred stock dividends on convertible preferred stock 3 — Less: earnings allocated to participating securities 1 2 Earnings allocated to common stockholders for diluted earnings per common share $ 52,536 $ 37,112 Weighted average shares outstanding for basic earnings per common share 83,662,430 73,330,731 Dilutive effect of: Stock options 636,515 237,556 Restricted shares and units 471,863 398,648 Convertible preferred stock 7,322 — Total dilutive effect of equity awards and convertible preferred stock 1,115,700 636,204 Weighted average shares outstanding for diluted earnings per common share 84,778,130 73,966,935 Basic earnings per common share $ 0.63 $ 0.51 Diluted earnings per common share 0.62 0.50

Business Combinations

Business Combinations	3 Months Ended
	Mar. 31, 2017
Business Combinations [Abstract]
Business Combinations	Business Combinations American Chartered Bancorp, Inc. On August 24, 2016, American Chartered Bancorp, Inc. ("American Chartered"), an Illinois corporation, was merged (the "American Chartered merger") with and into the Company, pursuant to the Agreement and Plan of Merger, dated as of November 20, 2015 (the "Merger Agreement"), by and between the Company and American Chartered. This transaction continues to solidify the Company's market position in Chicago. At the effective time of the merger (the "American Chartered Effective Time"), (i) each share of the common stock, no par value, of American Chartered ("American Chartered Common Stock") that was issued and outstanding immediately prior to the American Chartered Effective Time, (ii) each share of American Chartered’s 8% Cumulative Voting Convertible Preferred Stock, Series D ("American Chartered Series D Preferred Stock"), that was issued and outstanding immediately prior to the American Chartered Effective Time whose holder elected pursuant to American Chartered’s charter to receive the same consideration in the American Chartered merger as holders of American Chartered Common Stock, based on the number of shares of American Chartered Common Stock into which such share of American Chartered Series D Preferred Stock would otherwise then be convertible, and (iii) each share of American Chartered Non-Voting Perpetual Preferred Stock, Series F, that was issued and outstanding immediately prior to the American Chartered Effective Time, was converted into the right to receive, subject to the election and proration procedures set forth in the Merger Agreement: (1) cash in the amount of $9.30 (the "Cash Consideration") or (2) 0.2732 shares of the Company's common stock, with cash paid in lieu of fractional Company shares determined by multiplying the fractional Company share amount by $39.01 (the average closing sale price of the Company's common stock for the five full trading days ending on August 23, 2016) (the "Stock Consideration"). The holders of such shares of American Chartered stock also could elect to receive a combination of the Cash Consideration and the Stock Consideration for their shares. Each share of American Chartered Series D Preferred Stock whose holder did not elect to receive the same consideration in the American Chartered merger as holders of American Chartered Common Stock, based on the number of shares of American Chartered Common Stock into which such share of American Chartered Series D Preferred Stock would otherwise then be convertible, was converted into the right to receive one share of the Company's 8% cumulative voting convertible preferred stock, Series B. Consideration paid was $487.4 million , including $382.8 million in common stock ( 9.7 million shares), $102.3 million in cash and $2.3 million in preferred stock and stock-based awards assumed. The $102.3 million in cash consideration includes payments for the value of the net option shares of the American Chartered stock options pursuant to the Merger Agreement. This business combination was accounted for under the acquisition method of accounting. Accordingly, the results of operations of the acquired company have been included in the Company’s results of operations since the date of acquisition. Under this method of accounting, the assets acquired, liabilities assumed and consideration paid are recorded at their estimated fair values. The excess cost over fair value of net assets acquired is recorded as goodwill. In the event that the fair value of net assets acquired exceeds the cost, the Company will record a gain on the acquisition. As the consideration paid for American Chartered exceeded the net assets acquired, goodwill of $274.9 million was recorded on the acquisition and allocated to the banking segment. Goodwill recorded in the transaction, which reflects the increased Chicago market share and related synergies expected from the combined operations, is not tax deductible. As of March 31, 2017, the fair value estimates of loans increased by $1.8 million compared to previously reported balances, which decreased the deferred tax asset by $733 thousand and goodwill by $1.1 million . The amounts recognized for the business combination in the financial statements as of March 31, 2017 were determined to be final. Estimated fair values of the assets acquired and liabilities assumed in the American Chartered transaction, as of the closing date of the transaction were as follows (in thousands): August 24, 2016 ASSETS Cash and cash equivalents $ 93,307 Investment securities available for sale 505,564 Non-marketable securities - FRB and FHLB Stock 16,000 Loans 1,942,548 Premises and equipment 39,048 Cash surrender value of life insurance 59,917 Goodwill 274,885 Other intangibles 25,452 Other real estate owned 3,960 Other assets 31,408 Total assets $ 2,992,089 LIABILITIES Deposits $ 2,389,327 Short-term borrowings 48,305 Long-term borrowings 16,000 Junior subordinated notes issued to capital trusts 28,075 Accrued expenses and other liabilities 22,966 Total liabilities $ 2,504,673 Total identifiable net assets $ 487,416 Consideration: Market value of common stock at $39.28 per share at August 24, 2016 (9,744,636 shares of common stock issued) $ 382,769 Series B preferred stock at $2,337.97 per share at August 24, 2016 (525 shares of preferred stock issued) (1) 1,227 Stock-based compensation attributed to pre-business combination service 1,103 Cash paid 102,317 Total fair value of consideration, excluding Series B preferred stock $ 487,416 (1) Per share fair value amount determined as if the shares of Series B were converted into shares common stock. Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date without a carryover of the related allowance for loan and lease losses. These acquired loans are segregated into three types: pass rated loans with no discount attributable to credit quality, non-impaired loans with a discount attributable at least in part to credit quality and impaired loans with evidence of significant credit deterioration. • Pass rated loans (typically performing loans) are accounted for in accordance with ASC Topic 310-20 "Nonrefundable Fees and Other Costs" as these loans do not have evidence of credit deterioration since origination. • Non-impaired loans (typically performing substandard loans) are accounted for in accordance with ASC Topic 310-30 if they display at least some level of credit deterioration since origination. • Impaired loans (typically substandard loans on non-accrual status) are accounted for in accordance with ASC Topic 310-30 as they display significant credit deterioration since origination. For pass rated loans (non-purchased credit-impaired loans), the difference between the estimated fair value of the loans and the principal outstanding is accreted over the remaining life of the loans. The accretable discount for the non-purchased credit-impaired loans was $20.7 million as of the date of the acquisition. In accordance with ASC Topic 310-30, for both purchased non-impaired loans (performing substandard loans) and purchased credit-impaired loans, the loans are pooled by loan type and the difference between contractually required payments at acquisition and the cash flows expected to be collected is referred to as the non-accretable difference. Further, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan pools when there is a reasonable expectation about the amount and timing of such cash flows. The non-accretable and accretable discount for the purchased credit-impaired loans was $18.4 million and $5.3 million , respectively, as of the date of the acquisition. The following table presents the acquired loans as of the acquisition date (in thousands): Purchased Purchased Non-Credit-Impaired Fair value $ 62,104 $ 1,880,444 Gross contractual amounts receivable 93,490 2,149,868 Best estimate of contractual cash flows not expected to be collected (1) 22,293 114,154 Best estimate of contractual cash flows expected to be collected 71,197 2,035,714 (1) Includes interest payments not expected to be collected due to loan prepayments as well as principal and interest payments not expected to be collected due to customer defaults. The Company incurred costs of $2.0 million directly related to the consummation of the merger for the year ended December 31, 2016, which was recorded in professional and legal fees on the statement of operations. The data processing systems were converted in September 2016. The following table provides the unaudited pro forma information for the results of operations for the three months ended March 31, 2016, as if the acquisition had occurred on January 1, 2016. The pro forma results combine the historical results of American Chartered into the Company's consolidated statement of operations including the impact of certain acquisition accounting adjustments including loan discount accretion, investment securities discount accretion, intangible assets amortization, deposit premium accretion and borrowing discount amortization. The pro forma results have been prepared for comparative purposes only and are not necessarily indicative of the results that would have been obtained had the acquisition actually occurred on January 1, 2016. No assumptions have been applied to the pro forma results of operations regarding possible revenue enhancements, provision for credit losses, expense efficiencies or asset dispositions. The merger related expenses that have been recognized are included in net income in the table below. Three Months Ended March 31, 2016 (in thousands) Total revenues (net interest income plus non-interest income) $ 231,760 Net income 47,424 Revenues and earnings of the acquired company since the acquisition date have not been disclosed as it is not practicable as American Chartered was merged into the Company and separate financial information is not readily available.

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities Amortized cost and fair value of investment securities were as follows as of the dates indicated (in thousands): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value March 31, 2017 Available for Sale U.S. Government sponsored agencies and enterprises $ 23,204 $ 126 $ — $ 23,330 States and political subdivisions 371,329 18,480 (700 ) 389,109 Residential mortgage-backed securities 969,982 5,642 (9,249 ) 966,375 Commercial mortgage-backed securities 88,959 1,357 (162 ) 90,154 Corporate bonds 177,335 1,019 (257 ) 178,097 Equity securities 11,057 — (172 ) 10,885 Total Available for Sale 1,641,866 26,624 (10,540 ) 1,657,950 Held to Maturity States and political subdivisions 910,336 25,863 (1,930 ) 934,269 Residential mortgage-backed securities 145,672 4,057 — 149,729 Total Held to Maturity 1,056,008 29,920 (1,930 ) 1,083,998 Total $ 2,697,874 $ 56,544 $ (12,470 ) $ 2,741,948 December 31, 2016 Available for Sale U.S. Government sponsored agencies and enterprises $ 23,267 $ 148 $ — $ 23,415 States and political subdivisions 376,541 15,669 (845 ) 391,365 Residential mortgage-backed securities 988,744 5,741 (10,801 ) 983,684 Commercial mortgage-backed securities 91,949 1,221 (162 ) 93,008 Corporate bonds 193,164 1,426 (695 ) 193,895 Equity securities 11,000 — (172 ) 10,828 Total Available for Sale 1,684,665 24,205 (12,675 ) 1,696,195 Held to Maturity States and political subdivisions 910,608 21,609 (3,039 ) 929,178 Residential mortgage-backed securities 159,142 5,420 — 164,562 Total Held to Maturity 1,069,750 27,029 (3,039 ) 1,093,740 Total $ 2,754,415 $ 51,234 $ (15,714 ) $ 2,789,935 The Company has no direct exposure to the State of Illinois, but approximately 21% of the state and political subdivisions portfolio consisted of securities issued by municipalities located in Illinois as of March 31, 2017 . Approximately 95% of the state and political subdivisions securities were general obligation issues, and 27% were insured or had another form of credit enhancement as of March 31, 2017 . Unrealized losses on investment securities by length of time in a continuous unrealized loss position and the fair value of the related securities at March 31, 2017 were as follows (in thousands): Less Than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses Available for Sale States and political subdivisions $ 26,994 $ (700 ) $ — $ — $ 26,994 $ (700 ) Residential mortgage-backed securities 568,401 (8,666 ) 47,389 (583 ) 615,790 (9,249 ) Commercial mortgage-backed securities 6,955 (24 ) 11,558 (138 ) 18,513 (162 ) Corporate bonds 15,405 (82 ) 16,784 (175 ) 32,189 (257 ) Equity securities 10,885 (172 ) — — 10,885 (172 ) Total Available for Sale 628,640 (9,644 ) 75,731 (896 ) 704,371 (10,540 ) Held to Maturity States and political subdivisions 189,387 (1,906 ) 2,072 (24 ) 191,459 (1,930 ) Total $ 818,027 $ (11,550 ) $ 77,803 $ (920 ) $ 895,830 $ (12,470 ) Unrealized losses on investment securities by length of time in a continuous unrealized loss position and the fair value of the related securities at December 31, 2016 were as follows (in thousands): Less Than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses Available for Sale States and political subdivisions $ 42,806 $ (845 ) $ — $ — $ 42,806 $ (845 ) Residential mortgage-backed securities 623,732 (10,084 ) 54,990 (717 ) 678,722 (10,801 ) Commercial mortgage-backed securities 7,062 (9 ) 11,612 (153 ) 18,674 (162 ) Corporate bonds 21,028 (204 ) 20,088 (491 ) 41,116 (695 ) Equity securities 10,828 (172 ) — — 10,828 (172 ) Total Available for Sale 705,456 (11,314 ) 86,690 (1,361 ) 792,146 (12,675 ) Held to Maturity States and political subdivisions 243,568 (2,999 ) 2,988 (40 ) 246,556 (3,039 ) Total $ 949,024 $ (14,313 ) $ 89,678 $ (1,401 ) $ 1,038,702 $ (15,714 ) The total number of security positions in the investment portfolio in an unrealized loss position at March 31, 2017 was 538 compared to 615 at December 31, 2016 . This decrease in total number of security positions in a continuous unrealized loss position from December 31, 2016 to March 31, 2017 was mainly attributable to the mortgage-backed securities in the investment securities portfolio. Declines in the fair value of available for sale securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses to the extent the impairment is related to credit losses. The amount of the impairment related to other factors is recognized in other comprehensive income. In estimating other-than-temporary impairment losses, management considers, among other things, (i) the length of time and the extent to which the fair value has been less than cost, (ii) the financial condition and near-term prospects of the issuer, and (iii) whether the Company is more likely than not to sell the security before recovery of its cost basis. As of March 31, 2017 , management does not have the intent to sell any of the securities in the table above at March 31, 2017 and believes that it is more likely than not that the Company will not have to sell any such securities before a recovery of cost. The fair value is expected to recover as the securities approach their maturity date or repricing date or if market yields for such investments decline. Accordingly, as of March 31, 2017 , management believes the impairments detailed in the table above at March 31, 2017 are temporary. Changes in market interest rates can significantly influence the fair value of securities, and the fair value of our municipal securities portfolio would decline substantially if interest rates increase materially. Net gains recognized on investment securities available for sale were as follows (in thousands): Three Months Ended March 31, 2017 2016 Realized gains $ 237 $ 21 Realized losses (6 ) (21 ) Net gains $ 231 $ — The amortized cost and fair value of investment securities as of March 31, 2017 by contractual maturity are shown below. Maturities may differ from contractual maturities in mortgage-backed securities because the mortgages underlying the securities may be called or repaid without any penalties. Therefore, mortgage-backed securities are not included in the maturity categories in the following maturity summary. Amortized Fair (In thousands) Cost Value Available for sale: Due in one year or less $ 104,648 $ 105,122 Due after one year through five years 107,412 107,636 Due after five years through ten years 51,650 52,294 Due after ten years 308,158 325,484 Equity securities 11,057 10,885 Residential and commercial mortgage-backed securities 1,058,941 1,056,529 1,641,866 1,657,950 Held to maturity: Due in one year or less 58,499 58,576 Due after one year through five years 78,436 79,374 Due after five years through ten years 211,260 220,766 Due after ten years 562,141 575,553 Residential mortgage-backed securities 145,672 149,729 1,056,008 1,083,998 Total $ 2,697,874 $ 2,741,948 Investment securities with a carrying amount of $906.6 million at March 31, 2017 and $1.0 billion at December 31, 2016 were pledged as collateral on public deposits and for other purposes as required or permitted by law, while only $685.9 million and $756.5 million were required to be pledged at March 31, 2017 and December 31, 2016 , respectively.

Loans

Loans	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Loans	Loans Loans consist of the following at (in thousands): March 31, December 31, Commercial loans $ 4,364,122 $ 4,346,506 Commercial loans collateralized by assignment of lease payments 2,008,601 2,002,976 Commercial real estate 3,734,171 3,788,016 Residential real estate 1,227,218 1,060,828 Construction real estate 554,942 518,562 Indirect vehicle 573,792 541,680 Home equity 246,805 266,377 Other consumer loans 80,016 80,781 Total loans, excluding purchased credit-impaired loans 12,789,667 12,605,726 Purchased credit-impaired loans 168,814 163,077 Total loans $ 12,958,481 $ 12,768,803 Loans are made to individuals as well as commercial and tax exempt entities. Specific loan terms vary as to interest rate, repayment, and collateral requirements based on the type of loan requested and the credit worthiness of the prospective borrower. Except for commercial loans collateralized by assignment of lease payments, asset-based loans, residential real estate loans and indirect vehicle loans, credit risk tends to be geographically concentrated in that a majority of the loan customers are located in Illinois. The Company's extension of credit is governed by its Credit Risk Policy, which was established to control the quality of the Company's loans. This policy is reviewed and approved by the Enterprise Risk Committee of the Company's Board of Directors on an annual basis. Commercial Loans. Commercial credit is extended primarily to emerging middle market and middle market customers. Such credits are typically comprised of working capital loans, loans for physical asset expansion, asset acquisition loans and other business loans. Loans to closely held businesses will generally be guaranteed in full or for a significant amount by the businesses' principal owners. Commercial loans are made based primarily on the historical and projected cash flow of the borrower and secondarily on the underlying collateral provided by the borrower. The cash flows of borrowers, however, may not behave as forecasted and collateral securing loans may fluctuate in value due to economic or individual performance factors. Minimum standards and underwriting guidelines have been established for all commercial loan types. Asset-based loans, also included in commercial loans, are made to businesses with the primary source of repayment derived from payments on the related assets securing the loan. Collateral for these loans may include accounts receivable, inventory and equipment, and is monitored regularly to ensure ongoing sufficiency of collateral coverage and quality. The primary risk for these loans is a significant decline in collateral values due to general market conditions. Loan terms that mitigate these risks include typical industry amortization schedules, percentage of collateral advances, maintenance of cash collateral accounts and regular asset monitoring. Because of the national scope of our asset-based lending, the risk of these loans is also diversified by geography. Commercial Loans Collateralized by Assignment of Lease Payments ("Lease Loans"). The Company makes lease loans to lessors where the underlying leases are with both investment grade and non-investment grade companies. Investment grade lessees are companies rated in one of the four highest categories by Moody's Investor Services or Standard & Poor's Rating Services or, in the event the related lessee has not received any such rating, where the related lessee would be viewed under the underwriting policies of the Company as an investment grade company. Whether or not companies fall into this category, each lease loan is considered on its individual merit based on the financial wherewithal of the lessee using financial information available at the time of underwriting. In addition, leases that transfer substantially all of the benefits and risk related to the equipment ownership are classified as direct finance leases and are included in lease loans. Commercial Real Estate Loans. Commercial real estate loans are subject to underwriting standards and processes similar to commercial loans. These loans are viewed primarily as cash flow loans and the repayment of these loans is largely dependent on the successful operation of the property. Loan performance may be adversely affected by factors impacting the general economy or conditions specific to the real estate market such as geographic location and/or property type. Construction Real Estate Loans. The Company defines construction loans as loans where the loan proceeds are controlled by the Company and used exclusively for the improvement of real estate in which the Company holds a mortgage. Due to the inherent risk in this type of loan, these loans are subject to other industry specific policy guidelines outlined in the Company's Credit Risk Policy. Consumer Related Loans. The Company originates direct and indirect consumer loans, including primarily residential real estate, home equity lines and loans, credit cards, and indirect vehicle loans (motorcycle, marine, recreational and powersports vehicles). Each loan type is underwritten based upon several factors including debt to income, type of collateral and loan to collateral value, credit history and the Company's relationship with the borrower. Indirect loan and credit card underwriting involves the use of risk-based pricing in the underwriting process. Purchased credit-impaired loans. Purchased credit-impaired loans are accounted for under ASC Topic 310-30, which include purchased credit-impaired loans acquired through business combinations, FDIC-assisted transactions and re-purchase transactions with the Government National Mortgage Association ("GNMA"). The loans re-purchased from GNMA were originally sold by the Company with servicing retained and subsequently became delinquent. These loans are also insured by the Federal Housing Administration (commonly referred to as "FHA") or the U.S. Department of Veterans Affairs (commonly referred to as "VA") where the Company would be able to recover the principal balance of these loans. All re-purchases from GNMA are at the Company's discretion. A collateral pledge agreement exists whereby at all times, the Company must keep on hand, free of all other pledges, liens, and encumbrances, first mortgage loans and home equity loans with unpaid principal balances aggregating no less than 133% for first mortgage loans and 250% for home equity loans of the outstanding advances from the Federal Home Loan Bank. As of March 31, 2017 and December 31, 2016 , the Company had $4.3 billion and $5.5 billion , respectively, of loans pledged as collateral for long-term Federal Home Loan Bank advances and third party letters of credit, while only $3.4 billion and $3.2 billion were required to be pledged at March 31, 2017 and December 31, 2016 , respectively. The following table presents the contractual aging of the recorded investment in past due loans by class of loans as of March 31, 2017 and December 31, 2016 (in thousands): Current 30-59 Days 60-89 Days Loans Past Due Total Total March 31, 2017 Commercial $ 4,356,793 $ 2,197 $ 70 $ 5,062 $ 7,329 $ 4,364,122 Commercial collateralized by assignment of lease payments 1,992,906 12,664 1,267 1,764 15,695 2,008,601 Commercial real estate: Healthcare 594,225 — — — — 594,225 Industrial 834,842 907 — 2,264 3,171 838,013 Multifamily 515,137 808 181 315 1,304 516,441 Retail 498,262 90 180 — 270 498,532 Office 402,893 2,173 1,280 348 3,801 406,694 Other 877,080 2,505 127 554 3,186 880,266 Residential real estate 1,210,411 8,586 1,408 6,813 16,807 1,227,218 Construction real estate 554,645 297 — — 297 554,942 Indirect vehicle 570,575 2,161 708 348 3,217 573,792 Home equity 241,346 2,458 47 2,954 5,459 246,805 Other consumer 79,726 176 88 26 290 80,016 Total loans, excluding purchased credit-impaired loans 12,728,841 35,022 5,356 20,448 60,826 12,789,667 Purchased credit-impaired loans 87,050 13,383 4,984 63,397 81,764 168,814 Total loans $ 12,815,891 $ 48,405 $ 10,340 $ 83,845 $ 142,590 $ 12,958,481 Non-performing loan aging $ 21,864 $ 5,765 $ 1,461 $ 20,111 $ 27,337 $ 49,201 December 31, 2016 Commercial $ 4,337,348 $ 2,515 $ 156 $ 6,487 $ 9,158 $ 4,346,506 Commercial collateralized by assignment of lease payments 1,989,934 9,229 1,869 1,944 13,042 2,002,976 Commercial real estate: Healthcare 582,450 — — — — 582,450 Industrial 825,715 3,045 3,293 1,340 7,678 833,393 Multifamily 547,107 458 53 379 890 547,997 Retail 506,789 568 — — 568 507,357 Office 405,992 350 475 6,381 7,206 413,198 Other 899,950 2,385 1,155 131 3,671 903,621 Residential real estate 1,041,189 8,248 3,409 7,982 19,639 1,060,828 Construction real estate 518,171 — 391 — 391 518,562 Indirect vehicle 537,221 2,836 1,062 561 4,459 541,680 Home equity 261,765 1,219 815 2,578 4,612 266,377 Other consumer 80,443 152 120 66 338 80,781 Total loans, excluding purchased credit-impaired loans 12,534,074 31,005 12,798 27,849 71,652 12,605,726 Purchased credit-impaired loans 86,169 6,546 6,600 63,762 76,908 163,077 Total loans $ 12,620,243 $ 37,551 $ 19,398 $ 91,611 $ 148,560 $ 12,768,803 Non-performing loan aging $ 28,364 $ 2,308 $ 978 $ 27,702 $ 30,988 $ 59,352 The following table presents the recorded investment in non-accrual loans and loans past due ninety days or more and still accruing by class of loans, excluding purchased credit-impaired loans, as of March 31, 2017 and December 31, 2016 (in thousands): March 31, 2017 December 31, 2016 Loans past due Loans past due Non-accrual 90 days or more and still accruing Non-accrual 90 days or more and still accruing Commercial $ 6,575 $ — $ 11,222 $ 1,406 Commercial collateralized by assignment of lease payments 1,129 1,035 1,364 1,197 Commercial real estate: Healthcare — — — — Industrial 2,185 562 276 1,064 Multifamily 3,160 19 2,662 — Office 2,095 — 896 6,381 Retail 369 — 384 — Other 80 249 83 21 Residential real estate 17,206 270 16,538 235 Construction real estate — — — — Indirect vehicle 2,113 — 2,355 10 Home equity 12,124 — 13,187 — Other consumer 6 24 7 64 Total $ 47,042 $ 2,159 $ 48,974 $ 10,378 The Company utilizes an internal asset classification system as a means of reporting problem and potential problem loans. Under the Company's risk rating system, the Company classifies potential problem and problem loans as “Special Mention,” “Substandard,” and “Doubtful.” Substandard loans include those characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Loans classified as Doubtful have all the weaknesses inherent in those classified as Substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. Loans that do not currently expose the Company to sufficient risk to warrant classification in one of the aforementioned categories but possess weaknesses that deserve management's close attention are deemed to be Special Mention. Loans rated but not adversely classified are deemed to be Pass. Risk ratings are updated any time the situation warrants and at least annually. Loans not rated are included in groups of homogeneous loans with similar risk and loss characteristics and are not included in the table below. The following tables present the risk category of loans by class of loans based on the most recent analysis performed, excluding purchased credit-impaired loans, as of March 31, 2017 and December 31, 2016 (in thousands): Pass Special Substandard Doubtful Total March 31, 2017 Commercial $ 4,128,984 $ 138,056 $ 97,082 $ — $ 4,364,122 Commercial collateralized by assignment of lease payments 1,994,532 6,191 7,878 — 2,008,601 Commercial real estate: Healthcare 563,680 21,631 8,914 — 594,225 Industrial 805,925 26,657 5,431 — 838,013 Multifamily 511,625 449 4,367 — 516,441 Retail 490,494 5,455 2,583 — 498,532 Office 397,054 4,827 4,813 — 406,694 Other 801,650 40,282 38,334 — 880,266 Construction real estate 554,942 — — — 554,942 Total $ 10,248,886 $ 243,548 $ 169,402 $ — $ 10,661,836 December 31, 2016 Commercial $ 4,127,397 $ 113,838 $ 105,271 $ — $ 4,346,506 Commercial collateralized by assignment of lease payments 1,981,689 16,010 5,277 — 2,002,976 Commercial real estate: Healthcare 545,663 32,251 4,536 — 582,450 Industrial 814,668 17,962 763 — 833,393 Multifamily 544,071 312 3,614 — 547,997 Retail 498,458 8,350 549 — 507,357 Office 404,811 5,299 3,088 — 413,198 Other 820,229 44,629 38,763 — 903,621 Construction real estate 518,562 — — — 518,562 Total $ 10,255,548 $ 238,651 $ 161,861 $ — $ 10,656,060 Approximately $15.6 million and $17.3 million of the substandard loans were non-performing as of March 31, 2017 and December 31, 2016 , respectively. For residential real estate, home equity, indirect vehicle and other consumer loan classes, the Company also evaluates credit quality based on the aging status of the loan, which was previously presented, and by payment activity. The following table presents the recorded investment in those loan classes based on payment activity, excluding purchased credit-impaired loans, as of March 31, 2017 and December 31, 2016 (in thousands): Performing Non-performing Total March 31, 2017 Residential real estate $ 1,209,742 $ 17,476 $ 1,227,218 Indirect vehicle 571,679 2,113 573,792 Home equity 234,681 12,124 246,805 Other consumer 79,986 30 80,016 Total $ 2,096,088 $ 31,743 $ 2,127,831 December 31, 2016 Residential real estate $ 1,044,055 $ 16,773 $ 1,060,828 Indirect vehicle 539,315 2,365 541,680 Home equity 253,190 13,187 266,377 Other consumer 80,710 71 80,781 Total $ 1,917,270 $ 32,396 $ 1,949,666 The recorded investment in residential mortgage loans secured by residential real estate properties (including purchased credit-impaired loans) for which foreclosure proceedings are in process totaled $26.6 million and $29.1 million at March 31, 2017 and December 31, 2016 , respectively. The following tables present loans individually evaluated for impairment by class of loans, excluding purchased credit-impaired loans, as of March 31, 2017 and December 31, 2016 (in thousands): March 31, 2017 Three Months Ended Unpaid Recorded Partial Allowance for Average Interest With no related allowance recorded: Commercial $ 6,785 $ 6,785 $ — $ — $ 7,561 $ 15 Commercial collateralized by assignment of lease payments 1,111 729 382 — 1,085 — Commercial real estate: Healthcare — — — — — — Industrial 1,909 1,909 — — 1,906 — Multifamily 2,438 2,438 — — 2,842 29 Retail 2,646 906 1,740 — 918 — Office 1,335 1,335 — — 1,325 — Other — — — — — — Residential real estate — — — — — — Construction real estate — — — — — — Indirect vehicle 207 108 99 — 258 5 Home equity 592 592 — — 592 — Other consumer — — — — — — With an allowance recorded: Commercial 8,429 8,429 — 986 8,612 147 Commercial collateralized by assignment of lease payments — — — — — — Commercial real estate: Healthcare — — — — — — Industrial — — — — — — Multifamily — — — — — — Retail 3,572 3,572 — 286 3,581 — Office — — — — — — Other — — — — — — Residential real estate 17,725 15,803 1,922 2,192 15,801 1 Construction real estate — — — — — — Indirect vehicle — — — — — — Home equity 30,192 27,845 2,347 2,634 27,847 11 Other consumer — — — — — — Total $ 76,941 $ 70,451 $ 6,490 $ 6,098 $ 72,328 $ 208 December 31, 2016 Year Ended Unpaid Recorded Partial Allowance for Average Interest With no related allowance recorded: Commercial $ 9,056 $ 9,056 $ — $ — $ 5,944 $ — Commercial collateralized by assignment of lease payments 1,129 747 382 — 1,045 34 Commercial real estate: Healthcare — — — — — — Industrial — — — — 402 — Multifamily 1,922 1,922 — — 2,348 — Retail 2,670 929 1,741 — 2,165 — Office — — — — 256 — Other — — — — 60 — Residential real estate — — — — — — Construction real estate — — — — — — Indirect vehicle 223 122 101 — 252 — Home equity — — — — 143 — Other consumer — — — — — — With an allowance recorded: Commercial 14,403 14,403 — 2,889 22,737 — Commercial collateralized by assignment of lease payments — — — — 2,397 18 Commercial real estate: Healthcare — — — — — — Industrial — — — — — — Multifamily — — — — — — Retail 3,592 3,592 — 354 6,827 — Office — — — — 745 — Other — — — — 235 — Residential real estate 16,257 14,353 1,904 2,163 13,412 — Construction real estate — — — — — — Indirect vehicle — — — — — — Home equity 31,104 28,790 2,314 2,930 28,677 — Other consumer — — — — — — Total $ 80,356 $ 73,914 $ 6,442 $ 8,336 $ 87,645 $ 52 Impaired loans included accruing restructured loans of $31.1 million and $32.7 million that have been modified and are performing in accordance with those modified terms as of March 31, 2017 and December 31, 2016 , respectively. In addition, impaired loans included $20.7 million and $27.1 million of non-performing restructured loans as of March 31, 2017 and December 31, 2016 , respectively. Loans may be restructured in an effort to maximize collections from financially distressed borrowers. We use various restructuring techniques, including, but not limited to, deferring past due interest or principal, implementing an A/B note structure, redeeming past due taxes, reducing interest rates, extending maturities and modifying amortization schedules. Residential real estate loans are restructured in an effort to minimize losses while allowing borrowers to remain in their primary residences when possible. Programs that we offer to residential real estate borrowers include the Home Affordable Refinance Program (“HARP”), a restructuring program similar to the Home Affordable Modification Program (“HAMP”) for first mortgage borrowers, the Second Lien Modification Program (“2MP”) and similar programs for home equity borrowers in keeping with the restructuring techniques discussed above. Periodically, the Company will restructure a note into two separate notes (A/B structure), charging off the entire B portion of the note. The A note is structured with appropriate loan-to-value and cash flow coverage ratios that provide for a high likelihood of repayment. The A note is classified as a non-performing note until the borrower has displayed a historical payment performance for a reasonable time prior to and subsequent to the restructuring. A period of sustained repayment for at least six months generally is required to return the note to accrual status provided that management has determined that the performance is reasonably expected to continue. The A note will be classified as a restructured note (either performing or non-performing) through the calendar year of the restructuring that the historical payment performance has been established. As of March 31, 2017 and December 31, 2016 , there was one A/B structure with a recorded investment of $906 thousand and $929 thousand , respectively, which is included above as an accruing restructured loan. A loan classified as a troubled debt restructuring will no longer be included in the troubled debt restructuring disclosures in the years after the restructuring if the loan performs in accordance with the terms specified by the restructuring agreement and the interest rate specified in the restructuring agreement represents a market rate at the time of modification. The specified interest rate is considered a market rate when the interest rate is equal to or greater than the rate the Company is willing to accept at the time of restructuring for a new loan with comparable risk. If there are concerns that the borrower will not be able to meet the modified terms of the loan, the loan will continue to be included in the troubled debt restructuring disclosures. Impairment analyses on commercial-related loans classified as troubled debt restructurings are performed in conjunction with the normal allowance for loan and lease losses process. Consumer loans classified as troubled debt restructurings are aggregated in two pools that share common risk characteristics, home equity and residential real estate loans, with impairment measured on a quarterly basis based on the present value of expected future cash flows discounted at the loan's effective interest rate. The following table presents loans that were restructured during the three months ended March 31, 2017 (dollars in thousands): March 31, 2017 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Residential real estate 3 $ 409 $ 409 $ 49 Home equity 1 33 33 3 Total 4 $ 442 $ 442 $ 52 Non-Performing: Residential real estate 9 $ 1,257 $ 1,257 $ 154 Indirect vehicle 3 20 20 4 Total 12 $ 1,277 $ 1,277 $ 158 The following table presents loans that were restructured during the three months ended March 31, 2016 (dollars in thousands): March 31, 2016 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Home equity 2 $ 410 $ 410 $ — Total 2 $ 410 $ 410 $ — Non-Performing: Residential real estate 1 72 72 — Indirect vehicle 10 $ 80 $ 80 $ 22 Home equity 9 1,081 1,081 51 Total 20 $ 1,233 $ 1,233 $ 73 Of the troubled debt restructurings entered into during the past twelve months, none subsequently defaulted during the three months ended March 31, 2017 . Performing troubled debt restructurings are considered to have defaulted when they become 90 days or more past due post-restructuring or are placed on non-accrual status. The following table presents the troubled debt restructurings activity during the three months ended March 31, 2017 (in thousands): Performing Non-performing Beginning balance $ 32,687 $ 27,068 Additions 442 1,277 Charge-offs — (238 ) Principal payments, net (386 ) (4,734 ) Removals (2,334 ) (1,987 ) Transfers in 713 21 Transfers out (21 ) (713 ) Ending balance $ 31,101 $ 20,694 Loans removed from troubled debt restructuring status are those that were restructured in a previous calendar year at a market rate of interest and have performed in compliance with the modified terms. The following table presents the type of modification for loans that have been restructured during the three months ended March 31, 2017 (in thousands): March 31, 2017 Extended Maturity, Delay in Amortization Extended Payments or and Reduction Maturity and/or Reduction of of Interest Rate Amortization Interest Rate Total Residential real estate $ 455 $ 822 $ 389 $ 1,666 Indirect vehicle — — 20 20 Home equity — — 33 33 Total $ 455 $ 822 $ 442 $ 1,719 The following table presents the activity in the allowance for credit losses, balance in allowance for credit losses and recorded investment in loans by portfolio segment and based on impairment method as of March 31, 2017 and 2016 (in thousands): Commercial Commercial collateralized by assignment of lease payments Commercial real estate Residential real estate Construction real estate Indirect vehicle Home equity Other consumer Unfunded commitments Total March 31, 2017 Allowance for credit losses: Three Months Ended Beginning balance $ 44,661 $ 12,238 $ 51,807 $ 5,971 $ 14,758 $ 3,421 $ 5,469 $ 1,041 $ 2,476 $ 141,842 Charge-offs 168 — 1,085 90 — 1,411 173 446 — 3,373 Recoveries 1,510 463 518 528 112 652 283 229 — 4,295 Provision (5,313 ) (558 ) 6,980 1,722 (11 ) 962 (267 ) 367 (148 ) 3,734 Ending balance $ 40,690 $ 12,143 $ 58,220 $ 8,131 $ 14,859 $ 3,624 $ 5,312 $ 1,191 $ 2,328 $ 146,498 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 986 $ — $ 286 $ 2,192 $ — $ — $ 2,634 $ — $ 541 $ 6,639 Collectively evaluated for impairment 39,545 12,143 57,799 5,939 14,824 3,624 2,678 1,191 1,787 139,530 Acquired and accounted for under ASC 310-30 (1) 159 — 135 — 35 — — — — 329 Total ending allowance balance $ 40,690 $ 12,143 $ 58,220 $ 8,131 $ 14,859 $ 3,624 $ 5,312 $ 1,191 $ 2,328 $ 146,498 Loans: Individually evaluated for impairment $ 15,214 $ 729 $ 10,160 $ 15,803 $ — $ 108 $ 28,437 $ — $ — $ 70,451 Collectively evaluated for impairment 4,348,908 2,007,872 3,724,011 1,211,415 554,942 573,684 218,368 80,016 — 12,719,216 Acquired and accounted for under ASC 310-30 (1) 24,768 — 46,683 77,332 5,624 — 12,382 2,025 — 168,814 Total ending loans balance $ 4,388,890 $ 2,008,601 $ 3,780,854 $ 1,304,550 $ 560,566 $ 573,792 $ 259,187 $ 82,041 $ — $ 12,958,481 March 31, 2016 Allowance for credit losses: Three Months Ended Beginning balance $ 39,316 $ 10,434 $ 45,475 $ 5,734 $ 15,113 $ 2,418 $ 7,374 $ 2,276 $ 3,368 $ 131,508 Charge-offs 713 574 352 368 — 931 238 412 — 3,588 Recoveries 380 50 594 24 27 463 318 393 — 2,249 Provision 7,979 595 1,068 206 (526 ) 782 (2,432 ) 20 (129 ) 7,563 Ending balance $ 46,962 $ 10,505 $ 46,785 $ 5,596 $ 14,614 $ 2,732 $ 5,022 $ 2,277 $ 3,239 $ 137,732 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 12,174 $ 2,299 $ 6,522 $ 2,642 $ — $ — $ 3,044 $ — $ 1,205 $ 27,886 Collectively evaluated for impairment 34,282 8,206 39,273 2,954 14,520 2,732 1,978 2,277 2,034 108,256 Acquired and accounted for under ASC 310-30 (1) 506 — 990 — 94 — — — — 1,590 Total ending allowance balance $ 46,962 $ 10,505 $ 46,785 $ 5,596 $ 14,614 $ 2,732 $ 5,022 $ 2,277 $ 3,239 $ 137,732 Loans: Individually evaluated for impairment $ 31,869 $ 5,554 $ 29,100 $ 13,047 $ — $ 122 $ 29,260 $ — $ — $ 108,952 Collectively evaluated for impairment 3,477,735 1,768,550 2,802,714 664,744 310,278 432,793 177,819 77,318 — 9,711,951 Acquired and accounted for under ASC 310-30 (1) 25,924 — 29,325 55,397 13,859 — 13,353 2,587 — 140,445 Total ending loans balance $ 3,535,528 $ 1,774,104 $ 2,861,139 $ 733,188 $ 324,137 $ 432,915 $ 220,432 $ 79,905 $ — $ 9,961,348 (1) Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 “Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality.” Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date without a carryover of the related allowance for loan and lease losses. These acquired loans are segregated into three types: pass rated loans with no discount attributable to credit quality, non-impaired loans with a discount attributable at least in part to credit quality and impaired loans with evidence of significant credit deterioration. • Pass rated loans (typically performing loans) are accounted for in accordance with ASC Topic 310-20 "Nonrefundable Fees and Other Costs" as these loans do not have evidence of credit deterioration since origination. • Non-impaired loans (typically performing substandard loans) are accounted for in accordance with ASC Topic 310-30 if they display at least some level of credit deterioration since origination. • Impaired loans (typically substandard loans on non-accrual status) are accounted for in accordance with ASC Topic 310-30 as they display significant credit deterioration since origination. For pass rated loans (non-purchased credit-impaired loans), the difference between the estimated fair value of the loans and the principal outstanding is accreted over the remaining life of the loans. In accordance with ASC 310-30, for both purchased non-impaired loans and purchased credit-impaired loans, the loans are pooled by loan type and the difference between contractually required payments at acquisition and the cash flows expected to be collected is referred to as the non-accretable difference. Further, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan pools when there is a reasonable expectation about the amount and timing of such cash flows. Substantially all of the loans acquired in transactions with the FDIC displayed at least some level of credit deterioration and as such are included as non-impaired and impaired loans as described immediately above. During the three months ended March 31, 2017 , there was a negative provision for credit losses of $182 thousand and net charge-offs of $355 thousand in relation to purchased loans. There was $329 thousand and $866 thousand in allowance for loan and lease losses related to these purchased loans at March 31, 2017 and December 31, 2016 , respectively. The provision for credit losses and accompanying charge-offs are included in the table above. Changes in the accretable yield for loans acquired and accounted for under ASC 310-30 were as follows for the three months ended March 31, 2017 and 2016 (in thousands): Three Months Ended March 31, 2017 2016 Balance at beginning of period $ 16,050 $ 12,596 Purchases 43 — Accretion (2,188 ) (2,210 ) Other (1) 1,006 3,584 Balance at end of period $ 14,911 $ 13,970 (1) Primarily includes discount transfers from non-accretable discount to accretable discount due to better than expected performance of loan pools acquired and accounted for under ASC 310-30. In our FDIC-assisted transactions, the fair value of purchased credit-impaired loans, on the acquisition date, was determined based on assigned risk ratings, expected cash flows and the fair value of loan collateral. The fair value of loans that were non-impaired was determined based on estimates of losses on defaults and other market factors. Due to the loss-share agreements with the FDIC, we recorded a receivable (FDIC indemnification asset) from the FDIC equal to the present value of the corresponding reimbursement percentages on the estimated losses embedded in the loan portfolio. For other loans acquired through business combinations, the fair value of purchased credit-impaired loans, on the acquisition date, was determined based on assigned risk ratings, expected cash flows and the fair value of loan collateral. The fair value of loans that were non-impaired was determined based on estimates of losses on defaults and other market factors. The carrying amount of loans acquired through a business combination by loan pool type are as follows (in thousands): March 31, 2017 Purchased Purchased Non-Credit-Impaired Total Covered loans: Consumer related $ 16,840 $ — $ 16,840 Non-covered loans: Commercial loans 24,768 664,658 689,426 Commercial loans collateralized by assignment of lease payments — 68,405 68,405 Commercial real estate 46,683 1,174,593 1,221,276 Construction real estate 5,624 15,782 21,406 Consumer related 6,141 340,642 346,783 Total non-covered loans 83,216 2,264,080 2,347,296 Total acquired $ 100,056 $ 2,264,080 $ 2,364,136 Consumer related purchased credit-impaired loans includes re-purchase transactions with GNMA of $68.8 million as of March 31, 2017 in addition to loans acquired through a business combination noted in the table above. Effective April 1, 2014, the losses on commercial related loans (commercial, commercial real estate and construction real estate) acquired in connection with the Heritage Community Bank ("Heritage") FDIC-assisted transaction ceased being covered under the loss-share agreement for that transaction. The carrying amount of those loans was $1.6 million as of March 31, 2017 . Any recoveries, net of expenses, received on commercial related loans on which losses were incurred prior to April 1, 2014 were covered (and any such net recoveries must be shared with the FDIC in accordance with the loss-share agreement) through March 31, 2017. The losses on consumer related loans acquired in connection with the Heritage FDIC-assisted transaction will continue to be covered under the loss-share agreement through March 31, 2019. The losses on commercial related loans acquired in connection with the Benchmark Bank ("Benchmark") FDIC-assisted transaction ceased to be covered under the loss-share agreement for that transaction effective January 1, 2015. The carrying amount of those loans was $1.6 million as of March 31, 2017 . Any recoveries, net of expenses, received on commercial related loans on which losses were incurred prior to January 1, 2015 will continue to be covered (and any such net recoveries must be shared with the FDIC in accordance with the loss-share agreements) through December 31, 2017. The losses on consumer related loans acquired in connection with the Benchmark FDIC-assisted transaction will continue to be covered under the loss-share agreements through December 31, 2019. Effective July 1, 2015, the losses on commercial related loans acquired in connection with Broadway Bank ("Broadway") and New Century Bank ("New Century") FDIC-assisted transactions ceased to be covered under the loss-share agreements for those transactions. The carrying amount of those loans was $5.6 million as of March 31, 2017 . Any recoveries, net of expenses, received on commercial related loans on which losses were incurred prior to July 1, 2015 will continue to be covered (and any such net recoveries must be shared with the F

Goodwill and Intangibles

Goodwill and Intangibles	3 Months Ended
	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangibles	Goodwill and Intangibles The excess of the cost of an acquisition over the fair value of the net assets acquired, including core deposit and client relationship intangibles, consists of goodwill. Under ASC Topic 350, goodwill is subject to at least annual assessments for impairment by applying a fair value based test. The Company reviews goodwill to determine potential impairment annually, or more frequently if events and circumstances indicate that goodwill might be impaired, by comparing the carrying value of the reporting units with the fair value of the reporting units. The Company's annual assessment date is as of December 31. Goodwill is tested for impairment at the reporting unit level. The Company has three reporting units: Banking, Leasing and Mortgage Banking. No impairment losses were recognized during the three months ended March 31, 2017 or 2016 . The carrying amount of goodwill was $999.9 million and $1.0 billion at March 31, 2017 and December 31, 2016 , respectively. The following table presents the changes in the carrying amount of goodwill for the three months ended March 31, 2017 (in thousands): Banking Leasing Mortgage Banking Total Balance at beginning of period $ 960,398 $ 40,640 $ — $ 1,001,038 Goodwill from business combinations (1) (1,113 ) — — (1,113 ) Balance at end of period $ 959,285 $ 40,640 $ — $ 999,925 (1) Due to the adjustments recognized for the American Chartered merger. The Company has other intangible assets consisting of core deposit and client relationship intangibles that had a remaining weighted average amortization period of approximately 13 years as of March 31, 2017 . The following table presents the changes during the three months ended March 31, 2017 in the carrying amount of core deposit and client relationship intangibles, and the gross carrying amount, accumulated amortization, and net book value as of March 31, 2017 (in thousands): March 31, 2017 Balance at beginning of period $ 62,959 Amortization expense (2,090 ) Balance at end of period $ 60,869 Gross carrying amount $ 112,820 Accumulated amortization (51,951 ) Net book value $ 60,869 The following presents the estimated future amortization expense of other intangible assets (in thousands): Year ending December 31, Amount 2017 $ 6,103 2018 7,451 2019 5,674 2020 5,022 2021 4,790 Thereafter 31,829 $ 60,869

Deposits

Deposits	3 Months Ended
	Mar. 31, 2017
Banking and Thrift [Abstract]
Deposits	Deposits The composition of deposits was as follows as of March 31, 2017 and December 31, 2016 (in thousands): March 31, December 31, 2017 2016 Demand deposit accounts, non-interest bearing $ 6,211,173 $ 6,408,169 NOW, money market and interest bearing deposits 4,580,773 4,543,004 Savings accounts 1,126,879 1,135,992 Certificates of deposit, $250,000 or more 1,179,607 1,144,121 Other certificates of deposit 900,951 879,162 Total $ 13,999,383 $ 14,110,448 Certificates of deposit of $250,000 or more included $816.3 million and $795.0 million of brokered deposits at March 31, 2017 and December 31, 2016 , respectively. Brokered deposits typically consist of smaller individual time certificates that have the same liquidity characteristics and yields consistent with time certificates of $250,000 or more.

Short-Term Borrowings

Short-Term Borrowings	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Short-Term Borrowings	Short-Term Borrowings Short-term borrowings were as follows as of March 31, 2017 and December 31, 2016 (dollars in thousands): March 31, 2017 December 31, 2016 Weighted Average Interest Rate Amount Weighted Average Interest Rate Amount Customer repurchase agreements 0.21 % $ 182,128 0.22 % $ 237,538 Federal Home Loan Bank advances 0.89 1,300,000 0.63 1,275,000 Federal funds purchased 1.01 68,500 0.80 46,750 Line of credit — — 2.52 10,000 Total 0.81 % $ 1,550,628 0.59 % $ 1,569,288 Securities sold under agreements to repurchase are agreements in which the Company acquires funds by selling assets to another party under a simultaneous agreement to repurchase the same assets at a specified price and date. The Company enters into repurchase agreements and also offers a demand deposit account product to customers that sweeps their balances in excess of an agreed upon target amount into overnight repurchase agreements. All securities sold under agreements to repurchase are recorded on the face of the balance sheet. The Company pledges mortgage-backed securities as collateral for the repurchase agreements and may be required to provide additional collateral based on the fair value of those securities. The Company had Federal Home Loan Bank fixed rate advances with a maturity date less than one year of $1.3 billion at March 31, 2017 and December 31, 2016 . At March 31, 2017 , the interest rate on the advances outstanding on that date had rates ranging from 0.60% to 0.94% with maturities from April 2017 to March 2018 . The Company has loans pledged as collateral on this FHLB advance. See Note 6. Loans of the notes to the consolidated financial statements. On December 18, 2015, the Company entered into a $35.0 million unsecured line of credit at the holding company level with a correspondent bank. Interest is payable at a rate of one month LIBOR + 1.75% . No borrowings under the line of credit were outstanding as of March 31, 2017 , and $10.0 million were outstanding as of December 31, 2016 . The line of credit is scheduled to mature on June 30, 2017.

Long-Term Borrowings

Long-Term Borrowings	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Long-Term Borrowings	Long-Term Borrowings Long-term borrowings were as follows as of March 31, 2017 and December 31, 2016 (dollars in thousands): March 31, 2017 December 31, 2016 Weighted Average Interest Rate Amount Weighted Average Interest Rate Amount Federal Home Loan Bank advances 1.27 % $ 230,819 0.85 % $ 230,865 Notes payable 4.18 71,799 4.18 66,925 Term note 2.73 13,000 2.52 14,000 Total 1.99 % $ 315,618 1.64 % $ 311,790 The Company had Federal Home Loan Bank ("FHLB") advances with remaining contractual maturities greater than one year of $230.8 million at March 31, 2017 and $230.9 million at December 31, 2016 . As of March 31, 2017 , the advances had fixed terms with effective interest rates, net of discounts, ranging from 1.06% to 5.87% and maturities ranging from June 2018 to April 2035 . The Company has loans pledged as collateral on these FHLB advances. See Note 6. Loans of the notes to the consolidated financial statements. The Company had notes payable to banks totaling $71.8 million and $66.9 million at March 31, 2017 and December 31, 2016 , respectively, which as of March 31, 2017 , were accruing interest at rates ranging from 2.25% to 7.40% , with a weighted average rate of 4.18% . Lease investments includes equipment with an amortized cost of $80.4 million and $79.6 million at March 31, 2017 and December 31, 2016 , respectively, that is pledged as collateral on these notes. On August 24, 2016, the Company assumed a $16.0 million unsecured term loan at the holding company level with a correspondent bank through the American Chartered merger. Interest is payable at a rate of one month LIBOR + 1.75% and the loan matures on June 30, 2020. Principal payments of $1.0 million are due quarterly until maturity. As of March 31, 2017 , $13.0 million of principal was outstanding.

Junior Subordinated Notes Issue

Junior Subordinated Notes Issued to Capital Trusts	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Junior Subordinated Notes Issued to Capital Trusts	Junior Subordinated Notes Issued to Capital Trusts The Company has established statutory trusts for the sole purpose of issuing trust preferred securities and related trust common securities. The proceeds from such issuances were used by the trusts to purchase junior subordinated notes of the Company, which are the sole assets of each trust. Concurrently with the issuance of the trust preferred securities, the Company issued guarantees for the benefit of the holders of the trust preferred securities. The Company’s outstanding trust preferred securities qualify, and are treated by the Company, as Tier 2 regulatory capital. Prior to the completion of the American Chartered merger, the trust preferred securities qualified, and were treated by the Company, as Tier 1 regulatory capital. The Company owns all of the common securities of each trust. The trust preferred securities issued by each trust rank equally with the common securities in right of payment, except that if an event of default under the indenture governing the notes has occurred and is continuing, the preferred securities will rank senior to the common securities in right of payment. The table below summarizes the outstanding junior subordinated notes and the related trust preferred securities issued by each trust as of March 31, 2017 (in thousands): Coal City Capital Trust I MB Financial Capital Trust II MB Financial Capital Trust III MB Financial Capital Trust IV Junior Subordinated Notes: Principal balance $ 25,774 $ 36,083 $ 10,310 $ 20,619 Annual interest rate 3-mo LIBOR + 1.80% 3-mo LIBOR + 1.40% 3-mo LIBOR + 1.50% 3-mo LIBOR + 1.52% Stated maturity date September 1, 2028 September 15, 2035 September 23, 2036 September 15, 2036 Call date September 1, 2008 December 15, 2010 September 23, 2011 September 15, 2011 Trust Preferred Securities: Face Value $ 25,000 $ 35,000 $ 10,000 $ 20,000 Annual distribution rate 3-mo LIBOR + 1.80% 3-mo LIBOR + 1.40% 3-mo LIBOR + 1.50% 3-mo LIBOR + 1.52% Issuance date July 1998 August 2005 July 2006 August 2006 Distribution dates (1) Quarterly Quarterly Quarterly Quarterly MB Financial Capital Trust V MB Financial Capital Trust VI FOBB Statutory Trust III (2) TAYC Capital Trust II (3) Junior Subordinated Notes: Principal balance $ 30,928 $ 23,196 $ 5,155 $ 41,238 Annual interest rate 3-mo LIBOR + 1.30% 3-mo LIBOR + 1.30% 3-mo LIBOR + 2.80% 3-mo LIBOR + 2.68% Stated maturity date December 15, 2037 October 30, 2037 January 23, 2034 June 17, 2034 Call date December 15, 2012 October 30, 2012 January 23, 2009 June 17, 2009 Trust Preferred Securities: Face Value $ 30,000 $ 22,500 $ 5,000 $ 40,000 Annual distribution rate 3-mo LIBOR + 1.30% 3-mo LIBOR + 1.30% 3-mo LIBOR + 2.80% 3-mo LIBOR + 2.68% Issuance date September 2007 October 2007 December 2003 June 2004 Distribution dates (1) Quarterly Quarterly Quarterly Quarterly American Chartered Statutory Trust I (4) American Chartered Statutory Trust II (4) Junior Subordinated Notes: Principal balance $ 20,619 $ 10,310 Annual interest rate 3-mo LIBOR + 3.60% 3-mo LIBOR + 2.75% Stated maturity date December 18, 2031 October 7, 2034 Call date December 18, 2006 October 7, 2009 Trust Preferred Securities: Face Value $ 20,000 $ 10,000 Annual distribution rate 3-mo LIBOR + 3.60% 3-mo LIBOR + 2.75% Issuance date November 2001 August 2004 Distribution dates (1) Quarterly Quarterly (1) All distributions are cumulative and paid in cash. (2) FOBB Statutory Trust III was established by First Oak Brook Bancshares, Inc. (“FOBB”) prior to the Company's acquisition of FOBB in 2006, and the junior subordinated notes issued by FOBB to FOBB Statutory Trust III were assumed by the Company upon completion of the acquisition. (3) TAYC Capital Trust II was established by Taylor Capital Group, Inc. (“Taylor Capital”) prior to the Company's acquisition of Taylor Capital in 2014, and the junior subordinated notes issued by Taylor Capital to TAYC Capital Trust II were assumed by the Company upon completion of the acquisition. Principal balance and face value amounts associated with TAYC Capital Trust II do not include purchase accounting adjustments to such amounts, which in each case resulted in a discount of $6.7 million . (4) American Chartered Statutory Trust I and American Chartered Statutory Trust II were established by American Chartered prior to the Company's acquisition of American Chartered in August 2016, and the junior subordinated notes issued by American Chartered to American Chartered Statutory Trust I and American Chartered Statutory Trust II were assumed by the Company upon completion of the acquisition. Principal balance and face value amounts associated with American Chartered Statutory Trust I and American Chartered Statutory Trust II do not include purchase accounting adjustments to such amounts, which in each case resulted in a discount of $6.2 million . The trust preferred securities are subject to mandatory redemption, in whole or in part, upon repayment of the junior subordinated notes at the stated maturity date or upon redemption. Each trust’s ability to pay amounts due on the trust preferred securities is solely dependent upon the Company making payment on the related junior subordinated notes. The Company’s obligation under the junior subordinated notes and other relevant trust agreements, in aggregate, constitute a full and unconditional guarantee by the Company of each trust’s obligations under the trust preferred securities issued by each trust. The Company has the right to defer payment of interest on the notes and, therefore, distributions on the trust preferred securities, for up to five years , but not beyond the stated maturity date in the table above. During any such deferral period, the Company may not pay cash dividends on its common or preferred stock and generally may not repurchase its common or preferred stock.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments: The Company is a party to credit-related financial instruments with off-balance-sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit, standby letters of credit and commercial letters of credit. Such commitments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the consolidated balance sheets. The Company’s exposure to credit loss is represented by the contractual amount of these commitments. The Company follows the same credit policies in making commitments as it does for on-balance-sheet instruments. At March 31, 2017 and December 31, 2016 , the following financial instruments were outstanding, the contractual amounts of which represent off-balance sheet credit risk (in thousands): Contractual Amount March 31, 2017 December 31, 2016 Commitments to extend credit: Home equity lines $ 244,136 $ 235,279 Other commitments 3,724,089 3,679,259 Letters of credit: Standby 181,783 185,386 Commercial 2,765 1,766 Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require a payment of a fee. The commitments for home equity lines of credit may expire without being drawn upon. Therefore, the total commitment amounts do not necessarily represent future cash requirements. The amount of collateral obtained, if it is deemed necessary by the Company, is based on management’s credit evaluation of the customer. The Company, in the normal course of its business, regularly offers standby and commercial letters of credit to its bank customers. Standby and commercial letters of credit are a conditional but irrevocable form of guarantee. Under letters of credit, the Company typically guarantees payment to a third party beneficiary upon the default of payment or nonperformance by the bank customer and upon receipt of complying documentation from that beneficiary. Both standby and commercial letters of credit may be issued for any length of time, but normally do not exceed a period of five years. These letters of credit may also be extended or amended from time to time depending on the bank customer’s needs. As of March 31, 2017 , the maximum remaining term for any standby letters of credit was September 30, 2030 . A fee is charged to the bank customer and is recognized as income over the life of the letter of credit, unless considered non-rebatable under the terms of a letter of credit application. At March 31, 2017 , the aggregate contractual amount of these letters of credit, which represents the maximum potential amount of future payments that the Company would be obligated to pay, decreased $2.6 million to $184.5 million from $187.2 million at December 31, 2016 . Of the $184.5 million in commitments outstanding at March 31, 2017 , approximately $9.9 million of the letters of credit have been issued or renewed since December 31, 2016 . Letters of credit issued on behalf of bank customers may be done on either a secured or unsecured basis. If a letter credit is secured, the collateral can take various forms including bank accounts, investments, fixed assets, inventory, accounts receivable or real estate. The Company takes the same care in making credit decisions and obtaining collateral when it issues letters of credit on behalf of its customers as it does when making other types of loans. As of March 31, 2017 , the Company had approximately $3.7 million in capital expenditure commitments outstanding which relate to various projects to renovate the corporate office space and branches. Concentrations of credit risk: As of March 31, 2017 , approximately 21% of our investments in securities issued by states and political subdivisions were within the state of Illinois. We did not hold any direct exposure to the state of Illinois as of March 31, 2017 . Our commitments to extend credit are primarily related to commercial credits. Standby letters of credit are granted primarily to commercial borrowers. Our asset-based loans are made to borrowers located throughout the United States. Lease banking provides banking services to lessors located throughout the United States. Our leasing subsidiaries originate leases to companies located throughout the United States. In addition, our mortgage segment and indirect vehicle lenders originate loans to borrowers located throughout the United States. Contingencies: In the normal course of business, the Company is involved in various legal proceedings. In the opinion of management, any liability resulting from pending proceedings would not be expected to have a material adverse effect on the Company’s consolidated financial statements.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements ASC Topic 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability. The price in the principal (or most advantageous) market used to measure the fair value of the asset or liability shall not be adjusted for transaction costs. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets and liabilities; it is not a forced transaction. Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact and (iv) willing to transact. ASC Topic 820 requires the use of valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets and liabilities. The income approach uses valuation techniques to convert expected future amounts, such as cash flows or earnings, to a single present value amount on a discounted basis. The cost approach is based on the amount that currently would be required to replace the service capacity of an asset (replacement cost). Valuation techniques should be consistently applied. Inputs to valuation techniques refer to the assumptions that market participants would use in pricing the asset or liability. Inputs may be observable, meaning those that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources, or unobservable, meaning those that reflect the reporting entity's own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. In that regard, ASC Topic 820 establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect a reporting entity's own assumptions about the assumptions that market participants would use in pricing an asset or liability. A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below. In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality, the Company's creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. Our valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes the Company's valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally coincides with the Company's monthly and/or quarterly valuation process. Financial Instruments Recorded at Fair Value on a Recurring Basis Securities Available for Sale . The fair values of securities available for sale are determined by quoted prices in active markets, when available, and classified as Level 1. If quoted market prices are not available, the fair value is determined by a matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities and classified as Level 2. In cases where significant credit valuation adjustments are incorporated into the estimation of fair value, reported amounts are classified as Level 3. Loans Held for Sale. Mortgage loans originated and held for sale in the secondary market are carried at fair value. The fair value of loans held for sale is determined using quoted secondary market prices and classified as Level 2. Loans. The Company has elected to record certain mortgage loans at fair value. The fair value of these loans is determined using quoted secondary market prices and classified as Level 2. Mortgage Servicing Rights. The Company has elected to record its mortgage servicing rights at fair value. Mortgage servicing rights do not trade in an active market with readily observable prices. Accordingly, the Company determines the fair value of mortgage servicing rights by estimating the fair value of the future cash flows associated with the mortgage loans being serviced. Key economic assumptions used in measuring the fair value of mortgage servicing rights include, but are not limited to, prepayment speeds, discount rates, delinquencies and cost to service. The assumptions used in the model are validated on a regular basis. The fair value is validated on a quarterly basis with an independent third party. Any discrepancies between the internal model and the third party validation are investigated and resolved by an internal committee. Due to the nature of the valuation inputs, mortgage servicing rights are classified in Level 3 of the fair value hierarchy. Assets Held in Trust for Deferred Compensation and Associated Liabilities. Assets held in trust for deferred compensation are recorded at fair value and included in “Other Assets” on the consolidated balance sheets. These assets are invested in mutual funds and classified as Level 1. Deferred compensation liabilities, also classified as Level 1, are carried at the fair value of the obligation to the employee, which corresponds to the fair value of the invested assets. Derivatives . Currently, we use interest rate swaps to manage our interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative and classified as Level 2. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including LIBOR rate curves. The Company also obtains dealer quotations for these derivatives for comparative purposes to assess the reasonableness of the model valuations. In addition, the Company uses forward commitments to buy to-be-announced mortgage securities for which we do not intend to take delivery of the security and will enter into an offsetting position before physical delivery to lessen the price volatility of the mortgage servicing rights asset. Dealer quotations are used for these derivatives and are classified as Level 1. The Company also offers other derivatives, including foreign currency forward contracts and interest rate lock commitments, to our customers and offset our exposure from such contracts by purchasing other financial contracts, which are valued using market consensus prices. For certain interest rate lock commitments, the Company uses an external valuation model that relies on internally developed inputs to estimate the fair value of its interest rate lock commitments which is based on unobservable inputs that reflect management’s assumptions and specific information about each borrower transaction and is classified in Level 3 of the hierarchy. The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of March 31, 2017 and December 31, 2016 , segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands): Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) March 31, 2017 Financial assets Securities available for sale: U.S Government sponsored agencies and enterprises $ 23,330 $ — $ 23,330 $ — States and political subdivisions 389,109 — 388,736 373 Residential mortgage-backed securities 966,375 — 966,239 136 Commercial mortgage-backed securities 90,154 — 90,154 — Corporate bonds 178,097 — 178,097 — Equity securities 10,885 10,885 — — Loans held for sale 493,261 — 493,261 — Loans 16,029 — 16,029 — Mortgage servicing rights 251,498 — — 251,498 Assets held in trust for deferred compensation 21,231 21,231 — — Derivative financial instruments 37,942 858 31,473 5,611 Financial liabilities Other liabilities (1) 21,231 21,231 — — Derivative financial instruments 49,895 3,370 46,525 — December 31, 2016 Financial assets Securities available for sale: U.S. Government sponsored agencies and enterprises $ 23,415 $ — $ 23,415 $ — States and political subdivisions 391,365 — 390,992 373 Residential mortgage-backed securities 983,684 — 983,513 171 Commercial mortgage-backed securities 93,008 — 93,008 — Corporate bonds 193,895 — 193,895 — Equity securities 10,828 10,828 — — Loans held for sale 716,883 — 716,883 — Loans 16,273 — 16,273 — Mortgage servicing rights 238,011 — — 238,011 Assets held in trust for deferred compensation 18,723 18,723 — — Derivative financial instruments 44,586 7,687 33,739 3,160 Financial liabilities Other liabilities (1) 18,723 18,723 — — Derivative financial instruments 63,885 2,046 61,839 — (1) Liabilities associated with assets held in trust for deferred compensation The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a recurring basis that were categorized within the Level 3 of the fair value hierarchy: Fair Value at March 31, 2017 Valuation Technique Unobservable Input Range (in thousands) States and political subdivisions $ 373 Discounted cash flows Credit assumption 50% Loss Residential mortgage-backed securities 136 Discounted cash flows Constant pre-payment rates (CPR) 1% - 3% Mortgage servicing rights 251,498 Discounted cash flows CPR 6.5% - 7.9% Discount rate 9.53 - 11.04 Maturity (months) 323 - 357 Delinquencies 0.35 - 1.96 Costs to service $ 66 - $ 226 Additive delinquent costs to service $ 175 - $ 1,000 Derivative financial instruments (mortgage 5,611 Sales cash flows Expected closing ratio 70% - 95% interest rate lock commitments) Expected delivery price 98.77 bps - 108.32 bps The significant unobservable inputs used in the fair value measurement of the Company’s mortgage servicing rights include prepayment speeds, discount rates, maturities, delinquencies and cost to service. Significant increases in prepayment speeds, discount rates, delinquencies or cost to service would result in a significantly lower fair value measurement. Conversely, significant decreases in prepayment speeds, discount rates, delinquencies or costs to service would result in a significantly higher fair value measurement. With the exception of changes in delinquencies, which can change the cost to service, the unobservable inputs move independently of each other. Key economic assumptions used in the measuring of the fair value of the mortgage servicing rights and the sensitivity of the fair value to immediate adverse changes in those assumptions at March 31, 2017 are presented in the following table. This table does not take into account the derivatives used to economically hedge the mortgage servicing rights. (dollars in thousands, except for weighted average cost to service) March 31, 2017 Weighted average CPR 7.20 % Impact on fair value of 10% adverse change $ (7,847 ) Impact on fair value of 20% adverse change (15,282 ) Weighted average discount rate 9.80 % Impact on fair value of 10% adverse change $ (10,799 ) Impact on fair value of 20% adverse change (20,750 ) Weighted average delinquency rate 1.81 % Impact on fair value of 10% adverse change $ (2,466 ) Impact on fair value of 20% adverse change (4,353 ) Weighted average costs to service $ 89 Impact on fair value of 10% adverse change (4,719 ) Impact on fair value of 20% adverse change (9,438 ) The Company did not have any transfers between Level 1 and Level 2 of the fair value hierarchy during the three months ended March 31, 2017 . The Company's policy for determining transfers between levels occurs at the end of the reporting period when circumstances in the underlying valuation criteria change and result in transfer between levels. The following table presents additional information about financial assets measured at fair value on a recurring basis for which the Company used significant unobservable inputs (Level 3): Three Months Ended March 31, 2017 2016 2017 2016 2017 2016 (in thousands) Investment Securities Mortgage Servicing Rights Derivatives Balance, beginning of period $ 544 $ 773 $ 238,011 $ 168,162 $ 3,160 $ 3,822 Purchases — — 496 154 — — Originations — — 15,651 11,856 — — Included in earnings — — (2,660 ) (34,372 ) 2,451 4,397 Principal payments (35 ) (83 ) — — — — Sales — — — — — — Balance, ending of period $ 509 $ 690 $ 251,498 $ 145,800 $ 5,611 $ 8,219 Financial Instruments Recorded at Fair Value on a Nonrecurring Basis The Company may be required, from time to time, to measure certain financial assets and financial liabilities at fair value on a nonrecurring basis in accordance with U.S. GAAP. These include assets that are measured at the lower of cost or fair value that were recognized at fair value below cost at the end of the period. Impaired Loans. Loans for which it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement are considered impaired. Once a loan is identified as individually impaired, management measures impairment in accordance with ASC Topic 310. The fair value of impaired loans is estimated using one of several methods, including collateral value, market value of similar debt, enterprise value, liquidation value and discounted cash flows. Those impaired loans not requiring an allowance represent loans for which the fair value of the expected repayments or collateral exceed the recorded investments in such loans. In accordance with ASC Topic 820, impaired loans where an allowance is established based on the fair value of collateral require classification in the fair value hierarchy. Collateral values are estimated using Level 3 inputs based on customized discounting criteria. For a majority of impaired real estate loans where an allowance is established based on the fair value of collateral ( 100% at March 31, 2017 ), the Company obtains a current external appraisal. Other valuation techniques are used as well, including internal valuations, comparable property analysis and contractual sales information. Non-Financial Assets and Non-Financial Liabilities Recorded at Fair Value The Company has no non-financial assets or non-financial liabilities measured at fair value on a recurring basis. Certain non-financial assets and non-financial liabilities measured at fair value on a non-recurring basis include foreclosed assets and non-financial long-lived assets. Other Real Estate and Repossessed Vehicles Owned (Foreclosed Assets). Foreclosed assets, upon initial recognition, are measured and reported at fair value through a charge-off to the allowance for loan and lease losses based upon the fair value of the foreclosed asset. The fair value of foreclosed assets, upon initial recognition, are estimated using Level 3 inputs based on customized discounting criteria. Non-Financial Long-Lived Assets. Non-financial long-lived assets, when determined to be impaired, are measured and reported at fair value using Level 3 inputs based on customized discounting criteria. Assets measured at fair value on a nonrecurring basis as of March 31, 2017 and December 31, 2016 are included in the table below (in thousands): Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) March 31, 2017 Financial assets: Impaired loans $ 51,274 $ — $ — $ 51,274 Non-financial assets: Foreclosed assets 19,047 — — 19,047 December 31, 2016 Financial assets: Impaired loans $ 54,576 $ — $ — $ 54,576 Non-financial assets: Foreclosed assets 31,607 — — 31,607 The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a nonrecurring basis that were categorized within the Level 3 of the fair value hierarchy: Fair Value at Valuation Unobservable March 31, 2017 Technique Input Range (in thousands) Impaired loans $ 51,274 Appraisal of collateral Appraisal adjustments 5% - 10% Foreclosed assets 19,047 Appraisal of collateral Appraisal adjustments 5% - 10% ASC Topic 825 requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis. The methodologies for estimating the fair value of financial assets and financial liabilities that are measured at fair value on a recurring or non-recurring basis are discussed above. The estimated fair value approximates carrying value for cash and cash equivalents, accrued interest and the cash surrender value of life insurance policies. The methodologies for other financial assets and financial liabilities are discussed below: The following methods and assumptions were used by the Company in estimating the fair values of its other financial instruments: Cash and due from banks and interest earning deposits with banks: The carrying amounts reported in the balance sheet approximate fair value. Securities held to maturity: The fair values of securities held to maturity are determined by quoted prices in active markets, when available, and classified as Level 1. If quoted market prices are not available, the fair value is determined by a matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities and classified as Level 2. In cases where significant credit valuation adjustments are incorporated into the estimation of fair value, reported amounts are classified as Level 3. Non-marketable securities - FHLB and FRB Stock: The carrying amounts reported in the balance sheet approximate fair value. Loans : The fair values for loans are estimated using discounted cash flow analyses, using the corporate bond curve adjusted for liquidity for commercial loans and the swap curve adjusted for liquidity for retail loans. Non-interest bearing deposits : The fair values disclosed are equal to their balance sheet carrying amounts, which represent the amount payable on demand. Interest bearing deposits : The fair values disclosed for deposits with no defined maturities are equal to their carrying amounts, which represent the amounts payable on demand. Fair values for certificates of deposit are estimated using a discounted cash flow calculation that applies the Company's current incremental borrowing rates for similar terms. Short-term borrowings : The carrying amounts of federal funds purchased, borrowings under repurchase agreements and other short-term borrowings with maturities of 90 days or less approximate their fair values. The fair value of short-term borrowings greater than 90 days is based on the discounted value of contractual cash flows. Long-term borrowings : The fair values of the Company's long-term borrowings (other than deposits) are estimated using discounted cash flow analyses, based on the Company's current incremental borrowing rates for similar types of borrowing arrangements. Junior subordinated notes issued to capital trusts : The fair values of the Company's junior subordinated notes issued to capital trusts are estimated based on the quoted market prices, when available, of the related trust preferred security instruments, or are estimated based on the quoted market prices of comparable trust preferred securities. Accrued interest : The carrying amount of accrued interest receivable and payable approximate their fair values. Off-balance-sheet instruments : Fair values for the Company’s off-balance-sheet lending commitments (guarantees, letters of credit and commitments to extend credit) are based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements. The estimated fair values of financial instruments are as follows (in thousands): March 31, 2017 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets: Cash and due from banks $ 368,078 $ 368,078 $ 368,078 $ — $ — Interest earning deposits with banks 102,328 102,328 102,328 — — Investment securities available for sale 1,657,950 1,657,950 10,885 1,646,556 509 Investment securities held to maturity 1,056,008 1,083,998 — 1,083,998 — Non-marketable securities - FHLB and FRB stock 144,427 144,427 — — 144,427 Loans held for sale 493,261 493,261 — 493,261 — Loans, net 12,814,311 12,913,824 — 16,029 12,897,795 Accrued interest receivable 58,348 58,348 58,348 — — Derivative financial instruments 37,942 37,942 858 31,473 5,611 Financial Liabilities: Non-interest bearing deposits $ 6,211,173 $ 6,211,173 $ 6,211,173 $ — $ — Interest bearing deposits 7,788,210 7,782,914 — — 7,782,914 Short-term borrowings 1,550,628 1,550,730 — — 1,550,730 Long-term borrowings 315,618 320,655 — — 320,655 Junior subordinated notes issued to capital trusts 210,769 165,889 — — 165,889 Accrued interest payable 4,469 4,469 4,469 — — Derivative financial instruments 49,895 49,895 3,370 46,525 — December 31, 2016 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets: Cash and due from banks $ 364,783 $ 364,783 $ 364,783 $ — $ — Interest earning deposits with banks 98,686 98,686 98,686 — — Investment securities available for sale 1,696,195 1,696,195 10,828 1,684,823 544 Investment securities held to maturity 1,069,750 1,093,740 — 1,093,740 — Non-marketable securities - FHLB and FRB stock 143,276 143,276 — — 143,276 Loans held for sale 716,883 716,883 — 716,883 — Loans, net 12,629,437 12,747,107 — 16,273 12,730,834 Accrued interest receivable 59,024 59,024 59,024 — — Derivative financial instruments 44,586 44,586 7,687 33,739 3,160 Financial Liabilities: Non-interest bearing deposits $ 6,408,169 $ 6,408,169 $ 6,408,169 $ — $ — Interest bearing deposits 7,702,279 7,698,839 — — 7,698,839 Short-term borrowings 1,569,288 1,569,314 — — 1,569,314 Long-term borrowings 311,790 317,028 — — 317,028 Junior subordinated notes issued to capital trusts 210,668 157,098 — — 157,098 Accrued interest payable 4,288 4,288 4,288 — — Derivative financial instruments 63,885 63,885 2,046 61,839 —

Stock Incentive Plans

Stock Incentive Plans	3 Months Ended
	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Incentive Plans	Stock Incentive Plans ASC Topic 718 requires that the grant date fair value of equity awards to employees be recognized as compensation expense over the period during which an employee is required to provide service in exchange for such award. The following table summarizes the impact of the Company’s share-based payment plans in the financial statements for the periods shown (in thousands): Three Months Ended March 31, 2017 2016 Total compensation expense for share-based payment plans during the period $ 4,481 $ 4,051 Amount of related income tax benefit recognized in income 4,422 $ 1,583 The Company adopted the Omnibus Incentive Plan (the “Omnibus Plan”) in 1997. On May 28, 2014, the Company’s stockholders approved the third amendment and restatement of the Omnibus Plan to add 3,100,000 authorized shares for a total of 11,400,000 shares of common stock authorized to be utilized in connection with awards under the Omnibus Plan to directors, officers, and employees of the Company or any of its subsidiaries. The number of shares authorized increased by 2,400,000 to 13,800,000 upon completion of the Taylor Capital merger. Equity grants under the Omnibus Plan can be in the form of incentive stock options, non-qualified stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance units, and other stock-based awards. Shares awarded in the form of restricted stock, restricted stock units, performance shares, performance units, or other stock-based awards generally will reduce the shares available under the Omnibus Plan on a 2 -for- 1 basis. No more than 10% of the total number of authorized shares may be issued with respect to awards granted after May 28, 2014, other than stock appreciation rights, stock options and performance-based awards, which at the date of grant are scheduled to fully vest prior to three years from the date of grant (although such awards may provide scheduled vesting earlier with respect to some of such shares and for acceleration of vesting as provided in the Omnibus Plan). As of March 31, 2017 , there were 2,913,676 shares available for future grants. Annual equity-based incentive awards are generally granted to selected officers and employees in the first quarter of the year. Options are granted with an exercise price equal to no less than the market price of the Company’s shares at the date of grant; those option awards generally vest over four years of service and have 10 -year contractual terms. Restricted shares and units typically vest over a two to four year period. Equity awards may also be granted at other times throughout the year in connection with the recruitment and retention of officers and employees. Directors currently may elect, in lieu of cash, to receive up to 70% of their fees in stock options with a five year term, which are fully vested on the grant date (provided that the director may not sell the underlying shares for at least six months after the grant date), and up to 100% of their fees in restricted shares, which vest one year after the grant date. The following table summarizes changes in stock options for the three months ended March 31, 2017 : Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (In Years) Aggregate Intrinsic Value (in thousands) Options outstanding as of December 31, 2016 1,940,405 $ 27.45 5.31 Granted 155,059 45.59 Exercised (150,829 ) 26.83 Expired — — Forfeited or cancelled (6,518 ) 30.05 Options outstanding as of March 31, 2017 1,938,117 $ 28.94 5.59 $ 27,368 Options exercisable as of March 31, 2017 1,281,740 $ 26.95 4.09 $ 20,378 The fair value of each option award is estimated on the date of grant using the Black-Scholes option pricing model based on certain assumptions. Expected volatility is based on historical volatility and the expectations of future volatility of Company shares. The risk free interest rate for periods within the contractual term of the option is based on the U.S. Treasury yield curve in effect at the time of the grant. The expected life of options is estimated based on historical employee behavior and represents the period of time that options granted are expected to remain outstanding. The following assumptions were used for options granted during the three months ended March 31, 2017 : March 31, 2017 Risk-free interest rate 2.19 % Expected volatility of Company’s stock 22.65 % Expected dividend yield 1.66 % Expected life of options 5.9 years Weighted average fair value per option of options granted during the year $ 9.49 The total intrinsic value of options exercised during the three months ended March 31, 2017 and 2016 was $2.9 million and $170 thousand , respectively. The following is a summary of changes in restricted shares and units for the three months ended March 31, 2017 : Number of Shares and Units Weighted Average Grant Date Fair Value Shares and units outstanding at December 31, 2016 998,807 $ 31.20 Granted 371,856 45.85 Vested (327,008 ) 31.09 Forfeited or cancelled (7,739 ) 29.92 Shares and units outstanding at March 31, 2017 1,035,916 36.50 The total intrinsic value of restricted shares that vested during the three months ended March 31, 2017 and 2016 was $15.3 million and $6.0 million , respectively. The Company awarded 65,476 , 80,780 and 71,560 market-based restricted stock units in 2017, 2016 and 2015, respectively, which entitle recipients to shares of common stock at the end of a three year vesting period. Recipients will earn shares, totaling between 0% and 175% of the number of units issued, based on the Company's total stockholder return relative to a specified peer group of financial institutions over the three year period. The Company awarded 48,569 market-based restricted stock units in 2014 that vested in 2017. Recipients earned shares totaling approximately 121% of the number of units issued, based on the Company’s total shareholder return relative to a specified peer group of financial institutions over the three year period. The market-based restricted stock units are included in the preceding table as if the recipients earned shares equal to 100% of the units issued. A Monte Carlo simulation model was used to value the market-based restricted stock units at the time awarded. As of March 31, 2017 , there was $35.1 million of total unrecognized compensation cost related to nonvested share-based compensation arrangements (including share option and nonvested share awards) granted under the Omnibus Plan. At March 31, 2017 , the weighted-average period over which the unrecognized compensation expense is expected to be recognized was approximately three years.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The Company offers various derivatives, including interest rate swaps and foreign currency forward contracts, to its qualifying customers which can mitigate our exposure to market risk through the execution of off-setting positions with inter-bank dealer counterparties. This also permits the Company to offer customized risk management solutions to our customers. These customer accommodations and any offsetting financial contracts are treated as non-designated derivative instruments and carried at fair value through an adjustment to the statement of operations. Interest rate swap and foreign currency forward contracts involve the risk of dealing with counterparties and their ability to meet contractual terms. The net amount payable or receivable under interest rate swaps is accrued as an adjustment to interest income. The net amount receivable as of March 31, 2017 was approximately $2 thousand , and the net amount payable as of December 31, 2016 was approximately $1 thousand . The Company's credit exposure on interest rate swaps is limited to the Company's net favorable value and interest payments of all swaps to each counterparty. In such cases, collateral is generally required from the counterparties involved if the net value of the swaps exceeds a nominal amount. At March 31, 2017 , the Company’s credit exposure relating to interest rate swaps was approximately $10.0 million , which is secured by the underlying collateral on customer loans. The Company also enters into mortgage banking derivatives which are classified as non-designated hedging derivatives. These derivatives include interest rate lock commitments provided to customers to fund certain mortgage loans to be sold into the secondary market and forward commitments for the future delivery of such loans. It is the Company's practice to enter into forward commitments for the future delivery of residential mortgage loans when interest rate lock commitments are entered into in order to economically hedge the effect of future changes in interest rates on its commitments to fund the loans as well as on its portfolio of mortgage loans held-for-sale. The Company had fair value commercial loan interest rate swaps, to hedge its interest rate risk, with an aggregate notional amount of $95 thousand at March 31, 2017 . For fair value hedges, the changes in fair values of both the hedging derivative and the hedged item were recorded in current earnings as other income. Interest rate swaps, swaptions and treasury futures are used in order to lessen the price volatility of the mortgage servicing rights asset. The Company also uses forward commitments to buy to-be-announced ("TBA") mortgage securities for which the Company does not intend to take delivery of the security and will enter into an offsetting position before physical delivery to lessen the price volatility of the mortgage servicing rights asset. These derivatives are recorded at their fair value on the consolidated balance sheets in other assets with changes in fair value recorded on the consolidated statements of operations in mortgage banking revenue in non-interest income. The Company’s derivative financial instruments are summarized below as of March 31, 2017 and December 31, 2016 (in thousands): Asset Derivatives Liability Derivatives March 31, 2017 December 31, 2016 March 31, 2017 December 31, 2016 Notional Estimated Notional Estimated Notional Estimated Notional Estimated Amount Fair Value Amount Fair Value Amount Fair Value Amount Fair Value Derivative instruments designated as hedges of fair value: Interest rate swap contracts (1) $ — $ — $ — $ — $ 95 $ (3 ) $ 107 $ (4 ) Stand-alone derivative instruments: (2) Interest rate swap contracts 1,353,075 23,460 1,310,057 25,471 1,353,057 (23,460 ) 1,310,057 (25,471 ) Interest rate options contracts 268,130 1,207 217,546 881 268,130 (1,207 ) 217,546 (881 ) Foreign exchange contracts 40,176 2,010 40,641 4,429 39,875 (1,870 ) 40,505 (4,265 ) Spot foreign exchange contracts 2,333 48 1,691 12 563 (30 ) 660 (5 ) Mortgage related derivatives: Interest rate swap contracts 516,000 4,748 383,000 2,946 1,138,000 (19,955 ) 1,458,000 (31,212 ) Treasury futures contracts 37,500 223 15,500 41 — — — — TBA mortgage securities 83,000 582 — — — — 55,000 (132 ) Forward loan sale commitments 65,000 53 585,000 7,646 670,000 (3,370 ) 386,000 (1,915 ) Interest rate lock commitments 550,073 5,611 543,901 3,160 — — — — Total stand-alone derivative instruments 2,915,287 37,942 3,097,336 44,586 3,469,625 (49,892 ) 3,467,768 (63,881 ) Total $ 2,915,287 $ 37,942 $ 3,097,336 $ 44,586 $ 3,469,720 $ (49,895 ) $ 3,467,875 $ (63,885 ) (1) Derivative instruments designated to hedge fixed-rate commercial real estate loans. (2) These portfolio swaps are not designated as hedging instruments under ASC Topic 815. Amounts included in other operating income in the consolidated statements of operations related to derivative financial instruments were as follows (in thousands): Three Months Ended March 31, 2017 2016 Derivative instruments designated as hedges of fair value: Interest rate swap contracts $ 1 $ 1 Stand-alone derivative instruments: Interest rate swap contracts 1,849 2,338 Interest rate options contracts — 36 Foreign exchange contracts 63 128 Spot foreign exchange contracts 678 303 Mortgage related derivatives (10,141 ) 23,711 Total stand-alone derivative instruments (7,551 ) 26,516 Total $ (7,550 ) $ 26,517 Methods and assumptions used by the Company in estimating the fair value of its interest rate swaps are discussed in Note 13 to consolidated financial statements. Certain instruments and transactions subject to an agreement similar to a master netting arrangement are eligible for offset in the consolidated balance sheet. The instruments and transactions would include derivatives, sale and repurchase agreements and reverse sale and repurchase agreements, and securities borrowing and securities lending arrangements. The Company’s derivative transactions with financial institution counterparties are generally executed under International Swaps and Derivative Association (“ISDA”) master agreements which include “right of set-off” provisions. Under these agreements, there is generally a legally enforceable right to offset recognized amounts, and there may be an intention to settle such amounts on a net basis. The Company, however, does not generally offset such financial instruments for financial reporting purposes. Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of March 31, 2017 is summarized below (in thousands): Financial Assets Financial Liabilities Gross Amount Recognized Gross Amount Offset Net Amount Recognized Gross Amount Recognized Gross Amount Offset Net Amount Recognized Derivatives: Interest rate swap contracts, caps and floors $ 8,509 $ — $ 8,509 $ 16,255 $ — $ 16,255 Foreign exchange contracts 1,661 — 1,661 1,008 — 1,008 Mortgage related derivatives 5,606 — 5,606 23,325 — 23,325 Total derivatives 15,776 — 15,776 40,588 — 40,588 Repurchase agreements — — — 182,128 — 182,128 Total $ 15,776 $ — $ 15,776 $ 222,716 $ — $ 222,716 Financial Assets Financial Liabilities Net Amount Recognized Financial Instruments Collateral Net Amount Net Amount Recognized Financial Instruments Collateral Net Amount Derivatives: Counterparty A $ 4,647 $ (4,647 ) $ — $ — $ 11,616 $ (4,647 ) $ (6,969 ) $ — Counterparty B 5,567 (5,567 ) — — 11,088 (5,567 ) (5,521 ) — Counterparty C 3,504 (3,504 ) — — 6,325 (3,504 ) (2,821 ) — Other counterparties 2,058 (1,956 ) — 102 11,559 (1,956 ) (9,603 ) — Total derivatives 15,776 (15,674 ) — 102 40,588 (15,674 ) (24,914 ) — Repurchase agreements — — — — 182,128 — (182,128 ) — Total $ 15,776 $ (15,674 ) $ — $ 102 $ 222,716 $ (15,674 ) $ (207,042 ) $ — Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of December 31, 2016 is summarized below (in thousands): Financial Assets Financial Liabilities Gross Amount Recognized Gross Amount Offset Net Amount Recognized Gross Amount Recognized Gross Amount Offset Net Amount Recognized Derivatives: Interest rate swap contracts, caps and floors $ 7,885 $ — $ 7,885 $ 18,564 $ — $ 18,564 Foreign exchange contracts 4,315 — 4,315 1,674 — 1,674 Mortgage related derivatives 10,633 — 10,633 33,259 — 33,259 Total derivatives 22,833 — 22,833 53,497 — 53,497 Repurchase agreements — — — 237,538 — 237,538 Total $ 22,833 $ — $ 22,833 $ 291,035 $ — $ 291,035 Financial Assets Financial Liabilities Net Amount Recognized Financial Instruments Collateral Net Amount Net Amount Recognized Financial Instruments Collateral Net Amount Derivatives: Counterparty A $ 2,697 $ (2,697 ) $ — $ — $ 18,768 $ (2,697 ) $ (16,071 ) $ — Counterparty B 4,683 (4,683 ) — — 12,881 (4,683 ) (8,198 ) — Counterparty C 64 (64 ) — — 4,919 (64 ) (4,855 ) — Other counterparties 15,389 (10,938 ) — 4,451 16,929 (10,938 ) (5,980 ) 11 Total derivatives 22,833 (18,382 ) — 4,451 53,497 (18,382 ) (35,104 ) 11 Repurchase agreements — — — — 237,538 — (237,538 ) — Total $ 22,833 $ (18,382 ) $ — $ 4,451 $ 291,035 $ (18,382 ) $ (272,642 ) $ 11

Operating Segments

Operating Segments	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Operating Segments	Operating Segments The Company's operations consist of three reportable operating segments: Banking, Leasing and Mortgage Banking. The Company offers different products and services through its three segments. The accounting policies of the segments are generally the same as those of the consolidated company. The Banking Segment generates its revenues primarily from its lending, deposit gathering and fee business activities. The profitability of this segment's operations depends primarily on its net interest income after provision for credit losses, which is the difference between interest earned on interest earning assets and interest paid on interest bearing liabilities less provision for credit losses. The provision for credit losses is dependent on changes in the Banking Segment's loan portfolio and management’s assessment of the collectability of the loan portfolio as well as prevailing economic and market conditions. The Banking Segment is also subject to an extensive system of laws and regulations that are intended primarily for the protection of depositors and other customers, federal deposit insurance funds and the banking system as a whole. These laws and regulations govern such areas as capital, permissible activities, allowance for loan and lease losses, loans and investments, and rates of interest that can be charged on loans. The Leasing Segment generates its revenues through lease originations and related services. The Leasing Segment invests directly in equipment that the Company leases (referred to as direct finance, leveraged or operating leases) to "Fortune 1000," middle-market companies and healthcare providers located throughout the United States. The lease portfolio is made up of various kinds of equipment, generally technology related, such as computer systems, satellite equipment, medical equipment and general manufacturing, industrial, construction and transportation equipment. The Leasing Segment also specializes in selling third party equipment maintenance contracts to large companies. The Mortgage Banking Segment originates residential mortgage loans for sale to investors and for the Company's portfolio through its retail and third party originator channels. This segment also services residential mortgage loans for various investors and for loans owned by the Company. The Mortgage Banking Segment is subject to an extensive system of laws and regulations that are intended primarily for the protection of customers. Net interest income for the Leasing and Mortgage Banking segments include adjustments based on the Company's internal funds transfer pricing model. Non-interest income for the Leasing Segment includes income on loans originated for the sole purpose of funding equipment purchases related to leases at the Company's lease subsidiaries. The following tables present summary financial information for the reportable segments (in thousands): Banking Leasing Mortgage Banking Consolidated Three months ended March 31, 2017 Net interest income $ 131,449 $ 2,269 $ 9,325 $ 143,043 Provision for credit losses 3,527 (135 ) 342 3,734 Non-interest income 42,531 21,463 27,779 91,773 Non-interest expense (1) 107,839 13,844 33,982 155,665 Income tax expense 15,660 4,119 1,101 20,880 Net income $ 46,954 $ 5,904 $ 1,679 $ 54,537 Total assets $ 16,009,339 $ 1,173,558 $ 1,963,165 $ 19,146,062 Three months ended March 31, 2016 Net interest income $ 109,608 $ 2,423 $ 7,273 $ 119,304 Provision for credit losses 7,001 437 125 7,563 Non-interest income 35,019 19,195 27,479 81,693 Non-interest expense (1) 90,640 12,186 32,974 135,800 Income tax expense 14,350 3,509 661 18,520 Net income $ 32,636 $ 5,486 $ 992 $ 39,114 Total assets $ 13,235,848 $ 1,045,117 $ 1,294,688 $ 15,575,653 (1) Includes merger related and repositioning expenses of $258 thousand and $3.3 million in the Banking Segment for the three months ended March 31, 2017 and 2016 , respectively.

Preferred Stock

Preferred Stock	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Preferred Stock	Preferred Stock On August 18, 2014, in connection with the Taylor Capital merger, the Company issued one share of its Perpetual Non-Cumulative Preferred Stock, Series A (“Company Series A Preferred Stock”), in exchange for each of the 4,000,000 outstanding shares of Taylor Capital’s Perpetual Non-Cumulative Preferred Stock, Series A. Holders of the Company Series A Preferred Stock are entitled to receive, when as and if declared by the Company’s board of directors, non-cumulative cash dividends on the liquidation preference amount, which is $25 per share, at a rate of 8.00% per annum, payable quarterly. The Company Series A Preferred Stock is callable in February 2018. The Company Series A Preferred Stock is included in Tier 1 capital for regulatory capital purposes. On August 24, 2016, in connection with the American Chartered merger, the Company issued one share of its Cumulative Voting Convertible Preferred Stock, Series B ("Company Series B Preferred Stock"), in exchange for each of the 525 shares of American Chartered's Series D Preferred Stock outstanding immediately prior to the merger whose holders did not elect to receive the same consideration in the Merger as holders of American Chartered Common Stock, based on the number of shares of American Chartered Common Stock into which each such share of American Chartered Series D Preferred Stock would otherwise then be convertible. Holders of the Company Series B Preferred Stock are entitled to receive cumulative cash dividends on the liquidation preference amount, which is $1,000 per share, at a rate of 8.00% per annum, have the right to vote on all matters upon which holders of the Company's common stock are entitled to vote and have the right to convert each share into shares of the Company's common stock at any time. The Company Series B Preferred stock has a mandatory conversion date of September 20, 2017. The Company Series B Preferred Stock is included in Tier 2 capital for regulatory capital purposes.

New Authoritative Accounting 26

New Authoritative Accounting Guidance (Policies)	3 Months Ended
	Mar. 31, 2017
Accounting Changes and Error Corrections [Abstract]
New Authoritative Accounting Guidance	ASC Topic 805 "Business Combinations." New authoritative accounting guidance under ASC Topic 805 "Business Combinations" amends prior guidance to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The new authoritative guidance will be effective for reporting periods after January 1, 2018. This new authoritative guidance is not expected to have a significant impact on the Company's statements of operations or financial condition. ASC Topic 606 "Revenue from Contracts with Customers." New authoritative accounting guidance under ASC Topic 606, "Revenue from Contracts with Customers" amended prior guidance to require an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services and to provide clarification on identifying performance obligations and licensing implementation guidance. The new authoritative guidance was initially effective for reporting periods after January 1, 2017 but was deferred to January 1, 2018. The Company's revenue is comprised of interest income on financial assets, which is excluded from the scope of this new guidance, and non-interest income. The Company expects this new guidance will require it to change how certain recurring revenue streams are recognized within trust and asset management fees but does not expect these changes to have a significant impact on its statements of operations or financial condition. The Company continues to evaluate the impact of this guidance on other components of non-interest income. The Company expects to adopt this new guidance on January 1, 2018 with a cumulative effect adjustment to opening retained earnings, if such adjustment is deemed to be significant. ASC Topic 825 "Financial Instruments." New authoritative accounting guidance under ASC Topic 825 "Financial Instruments" amended prior guidance to require equity investments (except those accounted for under the equity method of accounting) to be measured at fair value with changes in fair value recognized in net income. An entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer. The new guidance simplifies the impairment assessment of equity investments without readily determinable fair values, requires public entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from changes in the instrument-specific credit risk when the entity has selected the fair value option for financial instruments and requires separate presentation of financial assets and liabilities by measurement category and form of financial asset. The new authoritative guidance will be effective for reporting periods after January 1, 2018 and is not expected to have a significant impact on the Company's statements of operations or financial condition. ASC Topic 405 "Liabilities-Extinguishment of Liabilities." New authoritative accounting guidance under ASC Topic 405, "Liabilities-Extinguishment of Liabilities" amended prior guidance to clarify that liabilities related to the sale of prepaid store-value products within the scope of this guidance are financial liabilities and that breakage for those liabilities are to be accounted for consistent with the breakage guidance in ASC Topic 606 "Revenue from Contracts with Customers." The new authoritative guidance will be effective for reporting periods after January 1, 2018. The Company is evaluating the new guidance but does not expect it to have a significant impact on the Company's statements of operations or financial condition. ASC Topic 842 "Leases." New authoritative accounting guidance under ASC Topic 842 "Leases" amended prior guidance to require lessees to recognize the assets and liabilities arising from all leases on the balance sheet. The new authoritative guidance defines a lease as a contract, or part of a contract, that conveys the right to control the use of identified property, plant, or equipment (an identified asset) for a period of time in exchange for consideration. In addition, the qualifications for a sale and leaseback transaction have been amended. The new authoritative guidance also requires qualitative and quantitative disclosures by lessees and lessors to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. In transition, lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The new authoritative guidance will be effective for reporting periods after January 1, 2019. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition. The Company expects an increase in assets and liabilities as a result of recording additional lease contracts where the Company is lessee. ASC Topic 815 "Derivatives and Hedging." New authoritative accounting guidance under ASC Topic 815 "Derivatives and Hedging" amended prior guidance to clarify that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument does not, in and of itself, require dedesignation of that hedging relationship provided that all other hedge accounting criteria continue to be met. An entity has an option to apply the amendments in this new authoritative guidance on either a prospective basis or a modified retrospective basis. The Company adopted this new authoritative guidance on January 1, 2017, and it did not have a significant impact on the Company's statements of operations or financial condition. New authoritative accounting guidance under ASC Topic 815 "Derivatives and Hedging" amended prior guidance to clarify what steps are required when assessing whether the economic characteristics and risks of call (put) options are clearly and closely related to the economic characteristics and risks of their debt hosts, which is one of the criteria for bifurcating an embedded derivative. An entity is required to consider whether (1) the payoff is adjusted based on changes in an index, (2) the payoff is indexed to an underlying other than interest rates or credit risk, (3) the debt involves a substantial premium or discount, and (4) the call (put) option is contingently exercisable. An entity should apply this new authoritative guidance on a modified retrospective basis to existing debt instruments as of the beginning of the fiscal year for which the amendments are effective. The Company adopted this new authoritative guidance on January 1, 2017, and it did not have a significant impact on the Company's statements of operations or financial condition. ASC Topic 323 "Investment - Equity Method and Joint Ventures." New authoritative accounting guidance under ASC Topic 323 "Investment - Equity Method and Joint Ventures" amended prior guidance to eliminate the requirement to retroactively adopt the equity method of accounting as a result of an increase in the level of ownership interest or degree of influence. The new authoritative guidance required that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. The Company adopted this new authoritative guidance on January 1, 2017, and it did not have an impact on the Company's statements of operations or financial condition. ASC Topic 718 "Compensation - Stock Compensation." New authoritative accounting guidance under ASC Topic 718 "Compensation - Stock Compensation" amended prior guidance on several aspects, including the income tax consequences, classification of awards as either equity or liability, and classification on the statement of cash flows. The new authoritative guidance allows for all excess tax benefits and tax deficiencies to be recognized as income tax benefit or expense in the income statement. The tax effects of exercised or vested awards should be treated as discrete items in the reporting period in which they occur. An entity also should recognize excess tax benefits regardless of whether the benefit reduces taxes payable in the current period. For the statement of cash flows, excess tax benefits should be classified along with other income tax cash flows as an operating activity, and cash paid by an employer when directly withholding shares for tax withholding purposes should be classified as a financing activity. The new authoritative guidance also allows an entity to make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures when they occur. In addition, the threshold to qualify for equity classification permits withholding up to the maximum statutory tax rates in the applicable jurisdictions. The Company early adopted the new guidance in the third quarter of 2016. The Company has also elected to account for forfeitures when they occur. ASC Topic 326 "Financial Instruments - Credit Losses." New authoritative accounting guidance under ASC Topic 326 " Financial Instruments - Credit Losses " amended the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information for credit loss estimates. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The new authoritative guidance also requires a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected (net of the allowance for credit losses). In addition, the credit losses relating to available-for-sale debt securities should be recorded through an allowance for credit losses rather than a write-down. The new authoritative guidance will be effective for reporting periods after January 1, 2020. The Company is evaluating the new guidance and expects it to have an impact on the Company's statements of operations and financial condition, the significance of which is not yet known. Due to the significant differences in the new authoritative guidance from the existing GAAP, the implementation of this guidance may result in material changes in our accounting for credit losses on the financial instruments. ASC Topic 230 "Statement of Cash Flows." New authoritative accounting guidance under ASC Topic 230 "Statement of Cash Flows" addresses eight specific cash flow classification issues with the objective of reducing the existing diversity in practice. The new authoritative guidance will be effective for reporting periods after January 1, 2018. This new authoritative guidance is not expected to have a significant impact on the Company's statements of operations or financial condition. New authoritative accounting guidance under ASC Topic 230 "Statement of Cash Flows" amends prior guidance to require an entity to include amounts generally described as restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning of period and end of period total amounts shown on the statement of cash flows. The new authoritative guidance will be effective for reporting periods after January 1, 2018. This new authoritative guidance is not expected to have a significant impact on the Company's statements of operations or financial condition. ASC Topic 740 "Income Taxes." New authoritative accounting guidance under ASC Topic 740 "Income Taxes" amends prior guidance to require an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. The new authoritative guidance will be effective for reporting periods after January 1, 2018. The Company is evaluating the new guidance and its impact on the Company's statements of operations or financial condition. ASC Topic 350 "Intangibles-Goodwill and Other." New authoritative accounting guidance under ASC Topic 350 "Intangibles-Goodwill and Other" amends prior guidance to eliminate Step 2 from the goodwill impairment test and require an entity to perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new authoritative guidance will be effective for reporting periods after January 1, 2020. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition. ASC Topic 610 "Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets." New authoritative accounting guidance under ASC Topic 610 "Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets" amends prior guidance to clarify the scope of Subtopic 610-20 by defining in substance nonfinancial assets and to add guidance for partial sales of nonfinancial assets. The new authoritative guidance will be effective for reporting periods after January 1, 2018. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition. ASC Topic 310 "Receivables - Nonrefundable Fees and Other Costs." New authoritative accounting guidance under ASC Topic 610 "Receivables - Nonrefundable Fees and Other Costs" amends prior guidance by shortening the amortization period for certain callable debt securities held at a premium requiring the premium to be amortized to the earliest call date. The new authoritative guidance will be effective for reporting periods after January 1, 2019 with early adoption permitted. The Company is evaluating the new guidance and its impact on the Company's statements of operations and financial condition.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Reconciliation of the Number of Shares Used in the Calculation of Basic and Diluted Earnings Per Common Share	The following table presents a reconciliation of the number of shares used in the calculation of basic and diluted earnings per common share (amounts in thousands, except share and per share data). Three Months Ended March 31, 2017 2016 Distributed earnings allocated to common stock $ 16,131 $ 12,654 Undistributed earnings 38,406 26,460 Net income 54,537 39,114 Less: preferred stock dividends 2,003 2,000 Net income available to common stockholders for basic earnings per common share 52,534 37,114 Plus: preferred stock dividends on convertible preferred stock 3 — Less: earnings allocated to participating securities 1 2 Earnings allocated to common stockholders for diluted earnings per common share $ 52,536 $ 37,112 Weighted average shares outstanding for basic earnings per common share 83,662,430 73,330,731 Dilutive effect of: Stock options 636,515 237,556 Restricted shares and units 471,863 398,648 Convertible preferred stock 7,322 — Total dilutive effect of equity awards and convertible preferred stock 1,115,700 636,204 Weighted average shares outstanding for diluted earnings per common share 84,778,130 73,966,935 Basic earnings per common share $ 0.63 $ 0.51 Diluted earnings per common share 0.62 0.50

Business Combinations (Tables)

Business Combinations (Tables)	3 Months Ended
	Mar. 31, 2017
Business Combinations [Abstract]
Schedule of Business Acquisitions	Estimated fair values of the assets acquired and liabilities assumed in the American Chartered transaction, as of the closing date of the transaction were as follows (in thousands): August 24, 2016 ASSETS Cash and cash equivalents $ 93,307 Investment securities available for sale 505,564 Non-marketable securities - FRB and FHLB Stock 16,000 Loans 1,942,548 Premises and equipment 39,048 Cash surrender value of life insurance 59,917 Goodwill 274,885 Other intangibles 25,452 Other real estate owned 3,960 Other assets 31,408 Total assets $ 2,992,089 LIABILITIES Deposits $ 2,389,327 Short-term borrowings 48,305 Long-term borrowings 16,000 Junior subordinated notes issued to capital trusts 28,075 Accrued expenses and other liabilities 22,966 Total liabilities $ 2,504,673 Total identifiable net assets $ 487,416 Consideration: Market value of common stock at $39.28 per share at August 24, 2016 (9,744,636 shares of common stock issued) $ 382,769 Series B preferred stock at $2,337.97 per share at August 24, 2016 (525 shares of preferred stock issued) (1) 1,227 Stock-based compensation attributed to pre-business combination service 1,103 Cash paid 102,317 Total fair value of consideration, excluding Series B preferred stock $ 487,416 (1) Per share fair value amount determined as if the shares of Series B were converted into shares common stock.
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period	The following table presents the acquired loans as of the acquisition date (in thousands): Purchased Purchased Non-Credit-Impaired Fair value $ 62,104 $ 1,880,444 Gross contractual amounts receivable 93,490 2,149,868 Best estimate of contractual cash flows not expected to be collected (1) 22,293 114,154 Best estimate of contractual cash flows expected to be collected 71,197 2,035,714 (1) Includes interest payments not expected to be collected due to loan prepayments as well as principal and interest payments not expected to be collected due to customer defaults.
Summary of Pro Forma Information	The following table provides the unaudited pro forma information for the results of operations for the three months ended March 31, 2016, as if the acquisition had occurred on January 1, 2016. The pro forma results combine the historical results of American Chartered into the Company's consolidated statement of operations including the impact of certain acquisition accounting adjustments including loan discount accretion, investment securities discount accretion, intangible assets amortization, deposit premium accretion and borrowing discount amortization. The pro forma results have been prepared for comparative purposes only and are not necessarily indicative of the results that would have been obtained had the acquisition actually occurred on January 1, 2016. No assumptions have been applied to the pro forma results of operations regarding possible revenue enhancements, provision for credit losses, expense efficiencies or asset dispositions. The merger related expenses that have been recognized are included in net income in the table below. Three Months Ended March 31, 2016 (in thousands) Total revenues (net interest income plus non-interest income) $ 231,760 Net income 47,424

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Summary of Amortized Cost and Fair Value of Investment Securities	Amortized cost and fair value of investment securities were as follows as of the dates indicated (in thousands): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value March 31, 2017 Available for Sale U.S. Government sponsored agencies and enterprises $ 23,204 $ 126 $ — $ 23,330 States and political subdivisions 371,329 18,480 (700 ) 389,109 Residential mortgage-backed securities 969,982 5,642 (9,249 ) 966,375 Commercial mortgage-backed securities 88,959 1,357 (162 ) 90,154 Corporate bonds 177,335 1,019 (257 ) 178,097 Equity securities 11,057 — (172 ) 10,885 Total Available for Sale 1,641,866 26,624 (10,540 ) 1,657,950 Held to Maturity States and political subdivisions 910,336 25,863 (1,930 ) 934,269 Residential mortgage-backed securities 145,672 4,057 — 149,729 Total Held to Maturity 1,056,008 29,920 (1,930 ) 1,083,998 Total $ 2,697,874 $ 56,544 $ (12,470 ) $ 2,741,948 December 31, 2016 Available for Sale U.S. Government sponsored agencies and enterprises $ 23,267 $ 148 $ — $ 23,415 States and political subdivisions 376,541 15,669 (845 ) 391,365 Residential mortgage-backed securities 988,744 5,741 (10,801 ) 983,684 Commercial mortgage-backed securities 91,949 1,221 (162 ) 93,008 Corporate bonds 193,164 1,426 (695 ) 193,895 Equity securities 11,000 — (172 ) 10,828 Total Available for Sale 1,684,665 24,205 (12,675 ) 1,696,195 Held to Maturity States and political subdivisions 910,608 21,609 (3,039 ) 929,178 Residential mortgage-backed securities 159,142 5,420 — 164,562 Total Held to Maturity 1,069,750 27,029 (3,039 ) 1,093,740 Total $ 2,754,415 $ 51,234 $ (15,714 ) $ 2,789,935
Unrealized Losses on Investment Securities and the Fair Value of the Related Securities	Unrealized losses on investment securities by length of time in a continuous unrealized loss position and the fair value of the related securities at March 31, 2017 were as follows (in thousands): Less Than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses Available for Sale States and political subdivisions $ 26,994 $ (700 ) $ — $ — $ 26,994 $ (700 ) Residential mortgage-backed securities 568,401 (8,666 ) 47,389 (583 ) 615,790 (9,249 ) Commercial mortgage-backed securities 6,955 (24 ) 11,558 (138 ) 18,513 (162 ) Corporate bonds 15,405 (82 ) 16,784 (175 ) 32,189 (257 ) Equity securities 10,885 (172 ) — — 10,885 (172 ) Total Available for Sale 628,640 (9,644 ) 75,731 (896 ) 704,371 (10,540 ) Held to Maturity States and political subdivisions 189,387 (1,906 ) 2,072 (24 ) 191,459 (1,930 ) Total $ 818,027 $ (11,550 ) $ 77,803 $ (920 ) $ 895,830 $ (12,470 ) Unrealized losses on investment securities by length of time in a continuous unrealized loss position and the fair value of the related securities at December 31, 2016 were as follows (in thousands): Less Than 12 Months 12 Months or More Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses Available for Sale States and political subdivisions $ 42,806 $ (845 ) $ — $ — $ 42,806 $ (845 ) Residential mortgage-backed securities 623,732 (10,084 ) 54,990 (717 ) 678,722 (10,801 ) Commercial mortgage-backed securities 7,062 (9 ) 11,612 (153 ) 18,674 (162 ) Corporate bonds 21,028 (204 ) 20,088 (491 ) 41,116 (695 ) Equity securities 10,828 (172 ) — — 10,828 (172 ) Total Available for Sale 705,456 (11,314 ) 86,690 (1,361 ) 792,146 (12,675 ) Held to Maturity States and political subdivisions 243,568 (2,999 ) 2,988 (40 ) 246,556 (3,039 ) Total $ 949,024 $ (14,313 ) $ 89,678 $ (1,401 ) $ 1,038,702 $ (15,714 )
Summary of Net Gains (Losses) on Investment Securities Available for Sale	Net gains recognized on investment securities available for sale were as follows (in thousands): Three Months Ended March 31, 2017 2016 Realized gains $ 237 $ 21 Realized losses (6 ) (21 ) Net gains $ 231 $ —
Schedule of Remaining Contractual Maturities of Securities Included in the Securities Portfolio	The amortized cost and fair value of investment securities as of March 31, 2017 by contractual maturity are shown below. Maturities may differ from contractual maturities in mortgage-backed securities because the mortgages underlying the securities may be called or repaid without any penalties. Therefore, mortgage-backed securities are not included in the maturity categories in the following maturity summary. Amortized Fair (In thousands) Cost Value Available for sale: Due in one year or less $ 104,648 $ 105,122 Due after one year through five years 107,412 107,636 Due after five years through ten years 51,650 52,294 Due after ten years 308,158 325,484 Equity securities 11,057 10,885 Residential and commercial mortgage-backed securities 1,058,941 1,056,529 1,641,866 1,657,950 Held to maturity: Due in one year or less 58,499 58,576 Due after one year through five years 78,436 79,374 Due after five years through ten years 211,260 220,766 Due after ten years 562,141 575,553 Residential mortgage-backed securities 145,672 149,729 1,056,008 1,083,998 Total $ 2,697,874 $ 2,741,948

Loans (Tables)

Loans (Tables)	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Schedule of Composition of Loans	Loans consist of the following at (in thousands): March 31, December 31, Commercial loans $ 4,364,122 $ 4,346,506 Commercial loans collateralized by assignment of lease payments 2,008,601 2,002,976 Commercial real estate 3,734,171 3,788,016 Residential real estate 1,227,218 1,060,828 Construction real estate 554,942 518,562 Indirect vehicle 573,792 541,680 Home equity 246,805 266,377 Other consumer loans 80,016 80,781 Total loans, excluding purchased credit-impaired loans 12,789,667 12,605,726 Purchased credit-impaired loans 168,814 163,077 Total loans $ 12,958,481 $ 12,768,803
Contractual Aging of the Recorded Investment in Past Due Loans by Class of Loans	The following table presents the contractual aging of the recorded investment in past due loans by class of loans as of March 31, 2017 and December 31, 2016 (in thousands): Current 30-59 Days 60-89 Days Loans Past Due Total Total March 31, 2017 Commercial $ 4,356,793 $ 2,197 $ 70 $ 5,062 $ 7,329 $ 4,364,122 Commercial collateralized by assignment of lease payments 1,992,906 12,664 1,267 1,764 15,695 2,008,601 Commercial real estate: Healthcare 594,225 — — — — 594,225 Industrial 834,842 907 — 2,264 3,171 838,013 Multifamily 515,137 808 181 315 1,304 516,441 Retail 498,262 90 180 — 270 498,532 Office 402,893 2,173 1,280 348 3,801 406,694 Other 877,080 2,505 127 554 3,186 880,266 Residential real estate 1,210,411 8,586 1,408 6,813 16,807 1,227,218 Construction real estate 554,645 297 — — 297 554,942 Indirect vehicle 570,575 2,161 708 348 3,217 573,792 Home equity 241,346 2,458 47 2,954 5,459 246,805 Other consumer 79,726 176 88 26 290 80,016 Total loans, excluding purchased credit-impaired loans 12,728,841 35,022 5,356 20,448 60,826 12,789,667 Purchased credit-impaired loans 87,050 13,383 4,984 63,397 81,764 168,814 Total loans $ 12,815,891 $ 48,405 $ 10,340 $ 83,845 $ 142,590 $ 12,958,481 Non-performing loan aging $ 21,864 $ 5,765 $ 1,461 $ 20,111 $ 27,337 $ 49,201 December 31, 2016 Commercial $ 4,337,348 $ 2,515 $ 156 $ 6,487 $ 9,158 $ 4,346,506 Commercial collateralized by assignment of lease payments 1,989,934 9,229 1,869 1,944 13,042 2,002,976 Commercial real estate: Healthcare 582,450 — — — — 582,450 Industrial 825,715 3,045 3,293 1,340 7,678 833,393 Multifamily 547,107 458 53 379 890 547,997 Retail 506,789 568 — — 568 507,357 Office 405,992 350 475 6,381 7,206 413,198 Other 899,950 2,385 1,155 131 3,671 903,621 Residential real estate 1,041,189 8,248 3,409 7,982 19,639 1,060,828 Construction real estate 518,171 — 391 — 391 518,562 Indirect vehicle 537,221 2,836 1,062 561 4,459 541,680 Home equity 261,765 1,219 815 2,578 4,612 266,377 Other consumer 80,443 152 120 66 338 80,781 Total loans, excluding purchased credit-impaired loans 12,534,074 31,005 12,798 27,849 71,652 12,605,726 Purchased credit-impaired loans 86,169 6,546 6,600 63,762 76,908 163,077 Total loans $ 12,620,243 $ 37,551 $ 19,398 $ 91,611 $ 148,560 $ 12,768,803 Non-performing loan aging $ 28,364 $ 2,308 $ 978 $ 27,702 $ 30,988 $ 59,352
Recorded Investment in Non-accrual Loans and Loans Past Due Ninety Days or More and Still Accruing by Class of Loans	The following table presents the recorded investment in non-accrual loans and loans past due ninety days or more and still accruing by class of loans, excluding purchased credit-impaired loans, as of March 31, 2017 and December 31, 2016 (in thousands): March 31, 2017 December 31, 2016 Loans past due Loans past due Non-accrual 90 days or more and still accruing Non-accrual 90 days or more and still accruing Commercial $ 6,575 $ — $ 11,222 $ 1,406 Commercial collateralized by assignment of lease payments 1,129 1,035 1,364 1,197 Commercial real estate: Healthcare — — — — Industrial 2,185 562 276 1,064 Multifamily 3,160 19 2,662 — Office 2,095 — 896 6,381 Retail 369 — 384 — Other 80 249 83 21 Residential real estate 17,206 270 16,538 235 Construction real estate — — — — Indirect vehicle 2,113 — 2,355 10 Home equity 12,124 — 13,187 — Other consumer 6 24 7 64 Total $ 47,042 $ 2,159 $ 48,974 $ 10,378
Risk Category of Loans by Class of Loans	The following tables present the risk category of loans by class of loans based on the most recent analysis performed, excluding purchased credit-impaired loans, as of March 31, 2017 and December 31, 2016 (in thousands): Pass Special Substandard Doubtful Total March 31, 2017 Commercial $ 4,128,984 $ 138,056 $ 97,082 $ — $ 4,364,122 Commercial collateralized by assignment of lease payments 1,994,532 6,191 7,878 — 2,008,601 Commercial real estate: Healthcare 563,680 21,631 8,914 — 594,225 Industrial 805,925 26,657 5,431 — 838,013 Multifamily 511,625 449 4,367 — 516,441 Retail 490,494 5,455 2,583 — 498,532 Office 397,054 4,827 4,813 — 406,694 Other 801,650 40,282 38,334 — 880,266 Construction real estate 554,942 — — — 554,942 Total $ 10,248,886 $ 243,548 $ 169,402 $ — $ 10,661,836 December 31, 2016 Commercial $ 4,127,397 $ 113,838 $ 105,271 $ — $ 4,346,506 Commercial collateralized by assignment of lease payments 1,981,689 16,010 5,277 — 2,002,976 Commercial real estate: Healthcare 545,663 32,251 4,536 — 582,450 Industrial 814,668 17,962 763 — 833,393 Multifamily 544,071 312 3,614 — 547,997 Retail 498,458 8,350 549 — 507,357 Office 404,811 5,299 3,088 — 413,198 Other 820,229 44,629 38,763 — 903,621 Construction real estate 518,562 — — — 518,562 Total $ 10,255,548 $ 238,651 $ 161,861 $ — $ 10,656,060
Recorded Investment in Loan Classes Based on Payment Activity	The following table presents the recorded investment in those loan classes based on payment activity, excluding purchased credit-impaired loans, as of March 31, 2017 and December 31, 2016 (in thousands): Performing Non-performing Total March 31, 2017 Residential real estate $ 1,209,742 $ 17,476 $ 1,227,218 Indirect vehicle 571,679 2,113 573,792 Home equity 234,681 12,124 246,805 Other consumer 79,986 30 80,016 Total $ 2,096,088 $ 31,743 $ 2,127,831 December 31, 2016 Residential real estate $ 1,044,055 $ 16,773 $ 1,060,828 Indirect vehicle 539,315 2,365 541,680 Home equity 253,190 13,187 266,377 Other consumer 80,710 71 80,781 Total $ 1,917,270 $ 32,396 $ 1,949,666
Loans Individually Evaluated for Impairment by Class of Loans	The following tables present loans individually evaluated for impairment by class of loans, excluding purchased credit-impaired loans, as of March 31, 2017 and December 31, 2016 (in thousands): March 31, 2017 Three Months Ended Unpaid Recorded Partial Allowance for Average Interest With no related allowance recorded: Commercial $ 6,785 $ 6,785 $ — $ — $ 7,561 $ 15 Commercial collateralized by assignment of lease payments 1,111 729 382 — 1,085 — Commercial real estate: Healthcare — — — — — — Industrial 1,909 1,909 — — 1,906 — Multifamily 2,438 2,438 — — 2,842 29 Retail 2,646 906 1,740 — 918 — Office 1,335 1,335 — — 1,325 — Other — — — — — — Residential real estate — — — — — — Construction real estate — — — — — — Indirect vehicle 207 108 99 — 258 5 Home equity 592 592 — — 592 — Other consumer — — — — — — With an allowance recorded: Commercial 8,429 8,429 — 986 8,612 147 Commercial collateralized by assignment of lease payments — — — — — — Commercial real estate: Healthcare — — — — — — Industrial — — — — — — Multifamily — — — — — — Retail 3,572 3,572 — 286 3,581 — Office — — — — — — Other — — — — — — Residential real estate 17,725 15,803 1,922 2,192 15,801 1 Construction real estate — — — — — — Indirect vehicle — — — — — — Home equity 30,192 27,845 2,347 2,634 27,847 11 Other consumer — — — — — — Total $ 76,941 $ 70,451 $ 6,490 $ 6,098 $ 72,328 $ 208 December 31, 2016 Year Ended Unpaid Recorded Partial Allowance for Average Interest With no related allowance recorded: Commercial $ 9,056 $ 9,056 $ — $ — $ 5,944 $ — Commercial collateralized by assignment of lease payments 1,129 747 382 — 1,045 34 Commercial real estate: Healthcare — — — — — — Industrial — — — — 402 — Multifamily 1,922 1,922 — — 2,348 — Retail 2,670 929 1,741 — 2,165 — Office — — — — 256 — Other — — — — 60 — Residential real estate — — — — — — Construction real estate — — — — — — Indirect vehicle 223 122 101 — 252 — Home equity — — — — 143 — Other consumer — — — — — — With an allowance recorded: Commercial 14,403 14,403 — 2,889 22,737 — Commercial collateralized by assignment of lease payments — — — — 2,397 18 Commercial real estate: Healthcare — — — — — — Industrial — — — — — — Multifamily — — — — — — Retail 3,592 3,592 — 354 6,827 — Office — — — — 745 — Other — — — — 235 — Residential real estate 16,257 14,353 1,904 2,163 13,412 — Construction real estate — — — — — — Indirect vehicle — — — — — — Home equity 31,104 28,790 2,314 2,930 28,677 — Other consumer — — — — — — Total $ 80,356 $ 73,914 $ 6,442 $ 8,336 $ 87,645 $ 52
Schedule of Loans That Have Been Restructured	The following table presents loans that were restructured during the three months ended March 31, 2017 (dollars in thousands): March 31, 2017 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Residential real estate 3 $ 409 $ 409 $ 49 Home equity 1 33 33 3 Total 4 $ 442 $ 442 $ 52 Non-Performing: Residential real estate 9 $ 1,257 $ 1,257 $ 154 Indirect vehicle 3 20 20 4 Total 12 $ 1,277 $ 1,277 $ 158 The following table presents loans that were restructured during the three months ended March 31, 2016 (dollars in thousands): March 31, 2016 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Home equity 2 $ 410 $ 410 $ — Total 2 $ 410 $ 410 $ — Non-Performing: Residential real estate 1 72 72 — Indirect vehicle 10 $ 80 $ 80 $ 22 Home equity 9 1,081 1,081 51 Total 20 $ 1,233 $ 1,233 $ 73
Troubled Debt Restructuring Activity Rollforward	The following table presents the troubled debt restructurings activity during the three months ended March 31, 2017 (in thousands): Performing Non-performing Beginning balance $ 32,687 $ 27,068 Additions 442 1,277 Charge-offs — (238 ) Principal payments, net (386 ) (4,734 ) Removals (2,334 ) (1,987 ) Transfers in 713 21 Transfers out (21 ) (713 ) Ending balance $ 31,101 $ 20,694
Type of Financing Receivable Modifications and Restructuring	The following table presents the type of modification for loans that have been restructured during the three months ended March 31, 2017 (in thousands): March 31, 2017 Extended Maturity, Delay in Amortization Extended Payments or and Reduction Maturity and/or Reduction of of Interest Rate Amortization Interest Rate Total Residential real estate $ 455 $ 822 $ 389 $ 1,666 Indirect vehicle — — 20 20 Home equity — — 33 33 Total $ 455 $ 822 $ 442 $ 1,719
Allowance Activity for Credit Losses, Balance in Allowance for Credit Losses and Recorded Investment in Loans by Portfolio Segment	The following table presents the activity in the allowance for credit losses, balance in allowance for credit losses and recorded investment in loans by portfolio segment and based on impairment method as of March 31, 2017 and 2016 (in thousands): Commercial Commercial collateralized by assignment of lease payments Commercial real estate Residential real estate Construction real estate Indirect vehicle Home equity Other consumer Unfunded commitments Total March 31, 2017 Allowance for credit losses: Three Months Ended Beginning balance $ 44,661 $ 12,238 $ 51,807 $ 5,971 $ 14,758 $ 3,421 $ 5,469 $ 1,041 $ 2,476 $ 141,842 Charge-offs 168 — 1,085 90 — 1,411 173 446 — 3,373 Recoveries 1,510 463 518 528 112 652 283 229 — 4,295 Provision (5,313 ) (558 ) 6,980 1,722 (11 ) 962 (267 ) 367 (148 ) 3,734 Ending balance $ 40,690 $ 12,143 $ 58,220 $ 8,131 $ 14,859 $ 3,624 $ 5,312 $ 1,191 $ 2,328 $ 146,498 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 986 $ — $ 286 $ 2,192 $ — $ — $ 2,634 $ — $ 541 $ 6,639 Collectively evaluated for impairment 39,545 12,143 57,799 5,939 14,824 3,624 2,678 1,191 1,787 139,530 Acquired and accounted for under ASC 310-30 (1) 159 — 135 — 35 — — — — 329 Total ending allowance balance $ 40,690 $ 12,143 $ 58,220 $ 8,131 $ 14,859 $ 3,624 $ 5,312 $ 1,191 $ 2,328 $ 146,498 Loans: Individually evaluated for impairment $ 15,214 $ 729 $ 10,160 $ 15,803 $ — $ 108 $ 28,437 $ — $ — $ 70,451 Collectively evaluated for impairment 4,348,908 2,007,872 3,724,011 1,211,415 554,942 573,684 218,368 80,016 — 12,719,216 Acquired and accounted for under ASC 310-30 (1) 24,768 — 46,683 77,332 5,624 — 12,382 2,025 — 168,814 Total ending loans balance $ 4,388,890 $ 2,008,601 $ 3,780,854 $ 1,304,550 $ 560,566 $ 573,792 $ 259,187 $ 82,041 $ — $ 12,958,481 March 31, 2016 Allowance for credit losses: Three Months Ended Beginning balance $ 39,316 $ 10,434 $ 45,475 $ 5,734 $ 15,113 $ 2,418 $ 7,374 $ 2,276 $ 3,368 $ 131,508 Charge-offs 713 574 352 368 — 931 238 412 — 3,588 Recoveries 380 50 594 24 27 463 318 393 — 2,249 Provision 7,979 595 1,068 206 (526 ) 782 (2,432 ) 20 (129 ) 7,563 Ending balance $ 46,962 $ 10,505 $ 46,785 $ 5,596 $ 14,614 $ 2,732 $ 5,022 $ 2,277 $ 3,239 $ 137,732 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 12,174 $ 2,299 $ 6,522 $ 2,642 $ — $ — $ 3,044 $ — $ 1,205 $ 27,886 Collectively evaluated for impairment 34,282 8,206 39,273 2,954 14,520 2,732 1,978 2,277 2,034 108,256 Acquired and accounted for under ASC 310-30 (1) 506 — 990 — 94 — — — — 1,590 Total ending allowance balance $ 46,962 $ 10,505 $ 46,785 $ 5,596 $ 14,614 $ 2,732 $ 5,022 $ 2,277 $ 3,239 $ 137,732 Loans: Individually evaluated for impairment $ 31,869 $ 5,554 $ 29,100 $ 13,047 $ — $ 122 $ 29,260 $ — $ — $ 108,952 Collectively evaluated for impairment 3,477,735 1,768,550 2,802,714 664,744 310,278 432,793 177,819 77,318 — 9,711,951 Acquired and accounted for under ASC 310-30 (1) 25,924 — 29,325 55,397 13,859 — 13,353 2,587 — 140,445 Total ending loans balance $ 3,535,528 $ 1,774,104 $ 2,861,139 $ 733,188 $ 324,137 $ 432,915 $ 220,432 $ 79,905 $ — $ 9,961,348 (1) Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 “Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality.”
Changes in the Accretable Yield for Purchased Credit-Impaired Loans	Changes in the accretable yield for loans acquired and accounted for under ASC 310-30 were as follows for the three months ended March 31, 2017 and 2016 (in thousands): Three Months Ended March 31, 2017 2016 Balance at beginning of period $ 16,050 $ 12,596 Purchases 43 — Accretion (2,188 ) (2,210 ) Other (1) 1,006 3,584 Balance at end of period $ 14,911 $ 13,970 (1) Primarily includes discount transfers from non-accretable discount to accretable discount due to better than expected performance of loan pools acquired and accounted for under ASC 310-30.
Carrying Amount of Loans Acquired Through a Business Combination by Loan Pool Type	The carrying amount of loans acquired through a business combination by loan pool type are as follows (in thousands): March 31, 2017 Purchased Purchased Non-Credit-Impaired Total Covered loans: Consumer related $ 16,840 $ — $ 16,840 Non-covered loans: Commercial loans 24,768 664,658 689,426 Commercial loans collateralized by assignment of lease payments — 68,405 68,405 Commercial real estate 46,683 1,174,593 1,221,276 Construction real estate 5,624 15,782 21,406 Consumer related 6,141 340,642 346,783 Total non-covered loans 83,216 2,264,080 2,347,296 Total acquired $ 100,056 $ 2,264,080 $ 2,364,136

Goodwill and Intangibles (Table

Goodwill and Intangibles (Tables)	3 Months Ended
	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Carrying Amount of Goodwill	The following table presents the changes in the carrying amount of goodwill for the three months ended March 31, 2017 (in thousands): Banking Leasing Mortgage Banking Total Balance at beginning of period $ 960,398 $ 40,640 $ — $ 1,001,038 Goodwill from business combinations (1) (1,113 ) — — (1,113 ) Balance at end of period $ 959,285 $ 40,640 $ — $ 999,925 (1) Due to the adjustments recognized for the American Chartered merger.
Changes in the Carrying Amount of Core Deposit and Client Relationship Intangibles	The following table presents the changes during the three months ended March 31, 2017 in the carrying amount of core deposit and client relationship intangibles, and the gross carrying amount, accumulated amortization, and net book value as of March 31, 2017 (in thousands): March 31, 2017 Balance at beginning of period $ 62,959 Amortization expense (2,090 ) Balance at end of period $ 60,869 Gross carrying amount $ 112,820 Accumulated amortization (51,951 ) Net book value $ 60,869
Estimated Future Amortization Expense of Other Intangible Assets	The following presents the estimated future amortization expense of other intangible assets (in thousands): Year ending December 31, Amount 2017 $ 6,103 2018 7,451 2019 5,674 2020 5,022 2021 4,790 Thereafter 31,829 $ 60,869

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2017
Banking and Thrift [Abstract]
Schedule of Composition of Deposits	The composition of deposits was as follows as of March 31, 2017 and December 31, 2016 (in thousands): March 31, December 31, 2017 2016 Demand deposit accounts, non-interest bearing $ 6,211,173 $ 6,408,169 NOW, money market and interest bearing deposits 4,580,773 4,543,004 Savings accounts 1,126,879 1,135,992 Certificates of deposit, $250,000 or more 1,179,607 1,144,121 Other certificates of deposit 900,951 879,162 Total $ 13,999,383 $ 14,110,448

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Summary of Short-Term Borrowings	Short-term borrowings were as follows as of March 31, 2017 and December 31, 2016 (dollars in thousands): March 31, 2017 December 31, 2016 Weighted Average Interest Rate Amount Weighted Average Interest Rate Amount Customer repurchase agreements 0.21 % $ 182,128 0.22 % $ 237,538 Federal Home Loan Bank advances 0.89 1,300,000 0.63 1,275,000 Federal funds purchased 1.01 68,500 0.80 46,750 Line of credit — — 2.52 10,000 Total 0.81 % $ 1,550,628 0.59 % $ 1,569,288

Long-Term Borrowings (Tables)

Long-Term Borrowings (Tables)	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Schedule of Long-term Borrowings	Long-term borrowings were as follows as of March 31, 2017 and December 31, 2016 (dollars in thousands): March 31, 2017 December 31, 2016 Weighted Average Interest Rate Amount Weighted Average Interest Rate Amount Federal Home Loan Bank advances 1.27 % $ 230,819 0.85 % $ 230,865 Notes payable 4.18 71,799 4.18 66,925 Term note 2.73 13,000 2.52 14,000 Total 1.99 % $ 315,618 1.64 % $ 311,790

Junior Subordinated Notes Iss35

Junior Subordinated Notes Issued to Capital Trusts (Tables)	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Outstanding Junior Subordinated Notes and the Related Trust Preferred Securities Issued by Each Trust	The table below summarizes the outstanding junior subordinated notes and the related trust preferred securities issued by each trust as of March 31, 2017 (in thousands): Coal City Capital Trust I MB Financial Capital Trust II MB Financial Capital Trust III MB Financial Capital Trust IV Junior Subordinated Notes: Principal balance $ 25,774 $ 36,083 $ 10,310 $ 20,619 Annual interest rate 3-mo LIBOR + 1.80% 3-mo LIBOR + 1.40% 3-mo LIBOR + 1.50% 3-mo LIBOR + 1.52% Stated maturity date September 1, 2028 September 15, 2035 September 23, 2036 September 15, 2036 Call date September 1, 2008 December 15, 2010 September 23, 2011 September 15, 2011 Trust Preferred Securities: Face Value $ 25,000 $ 35,000 $ 10,000 $ 20,000 Annual distribution rate 3-mo LIBOR + 1.80% 3-mo LIBOR + 1.40% 3-mo LIBOR + 1.50% 3-mo LIBOR + 1.52% Issuance date July 1998 August 2005 July 2006 August 2006 Distribution dates (1) Quarterly Quarterly Quarterly Quarterly MB Financial Capital Trust V MB Financial Capital Trust VI FOBB Statutory Trust III (2) TAYC Capital Trust II (3) Junior Subordinated Notes: Principal balance $ 30,928 $ 23,196 $ 5,155 $ 41,238 Annual interest rate 3-mo LIBOR + 1.30% 3-mo LIBOR + 1.30% 3-mo LIBOR + 2.80% 3-mo LIBOR + 2.68% Stated maturity date December 15, 2037 October 30, 2037 January 23, 2034 June 17, 2034 Call date December 15, 2012 October 30, 2012 January 23, 2009 June 17, 2009 Trust Preferred Securities: Face Value $ 30,000 $ 22,500 $ 5,000 $ 40,000 Annual distribution rate 3-mo LIBOR + 1.30% 3-mo LIBOR + 1.30% 3-mo LIBOR + 2.80% 3-mo LIBOR + 2.68% Issuance date September 2007 October 2007 December 2003 June 2004 Distribution dates (1) Quarterly Quarterly Quarterly Quarterly American Chartered Statutory Trust I (4) American Chartered Statutory Trust II (4) Junior Subordinated Notes: Principal balance $ 20,619 $ 10,310 Annual interest rate 3-mo LIBOR + 3.60% 3-mo LIBOR + 2.75% Stated maturity date December 18, 2031 October 7, 2034 Call date December 18, 2006 October 7, 2009 Trust Preferred Securities: Face Value $ 20,000 $ 10,000 Annual distribution rate 3-mo LIBOR + 3.60% 3-mo LIBOR + 2.75% Issuance date November 2001 August 2004 Distribution dates (1) Quarterly Quarterly (1) All distributions are cumulative and paid in cash. (2) FOBB Statutory Trust III was established by First Oak Brook Bancshares, Inc. (“FOBB”) prior to the Company's acquisition of FOBB in 2006, and the junior subordinated notes issued by FOBB to FOBB Statutory Trust III were assumed by the Company upon completion of the acquisition. (3) TAYC Capital Trust II was established by Taylor Capital Group, Inc. (“Taylor Capital”) prior to the Company's acquisition of Taylor Capital in 2014, and the junior subordinated notes issued by Taylor Capital to TAYC Capital Trust II were assumed by the Company upon completion of the acquisition. Principal balance and face value amounts associated with TAYC Capital Trust II do not include purchase accounting adjustments to such amounts, which in each case resulted in a discount of $6.7 million . (4) American Chartered Statutory Trust I and American Chartered Statutory Trust II were established by American Chartered prior to the Company's acquisition of American Chartered in August 2016, and the junior subordinated notes issued by American Chartered to American Chartered Statutory Trust I and American Chartered Statutory Trust II were assumed by the Company upon completion of the acquisition. Principal balance and face value amounts associated with American Chartered Statutory Trust I and American Chartered Statutory Trust II do not include purchase accounting adjustments to such amounts, which in each case resulted in a discount of $6.2 million .

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule of Outstanding Financial Instruments, Contractual Amounts of Off-Balance Sheet Credit Risk	At March 31, 2017 and December 31, 2016 , the following financial instruments were outstanding, the contractual amounts of which represent off-balance sheet credit risk (in thousands): Contractual Amount March 31, 2017 December 31, 2016 Commitments to extend credit: Home equity lines $ 244,136 $ 235,279 Other commitments 3,724,089 3,679,259 Letters of credit: Standby 181,783 185,386 Commercial 2,765 1,766

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis	The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of March 31, 2017 and December 31, 2016 , segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands): Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) March 31, 2017 Financial assets Securities available for sale: U.S Government sponsored agencies and enterprises $ 23,330 $ — $ 23,330 $ — States and political subdivisions 389,109 — 388,736 373 Residential mortgage-backed securities 966,375 — 966,239 136 Commercial mortgage-backed securities 90,154 — 90,154 — Corporate bonds 178,097 — 178,097 — Equity securities 10,885 10,885 — — Loans held for sale 493,261 — 493,261 — Loans 16,029 — 16,029 — Mortgage servicing rights 251,498 — — 251,498 Assets held in trust for deferred compensation 21,231 21,231 — — Derivative financial instruments 37,942 858 31,473 5,611 Financial liabilities Other liabilities (1) 21,231 21,231 — — Derivative financial instruments 49,895 3,370 46,525 — December 31, 2016 Financial assets Securities available for sale: U.S. Government sponsored agencies and enterprises $ 23,415 $ — $ 23,415 $ — States and political subdivisions 391,365 — 390,992 373 Residential mortgage-backed securities 983,684 — 983,513 171 Commercial mortgage-backed securities 93,008 — 93,008 — Corporate bonds 193,895 — 193,895 — Equity securities 10,828 10,828 — — Loans held for sale 716,883 — 716,883 — Loans 16,273 — 16,273 — Mortgage servicing rights 238,011 — — 238,011 Assets held in trust for deferred compensation 18,723 18,723 — — Derivative financial instruments 44,586 7,687 33,739 3,160 Financial liabilities Other liabilities (1) 18,723 18,723 — — Derivative financial instruments 63,885 2,046 61,839 — (1) Liabilities associated with assets held in trust for deferred compensation
Summary of Financial Assets Measured at Fair Value on a Recurring Basis, Unobservable Inputs Used	The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a recurring basis that were categorized within the Level 3 of the fair value hierarchy: Fair Value at March 31, 2017 Valuation Technique Unobservable Input Range (in thousands) States and political subdivisions $ 373 Discounted cash flows Credit assumption 50% Loss Residential mortgage-backed securities 136 Discounted cash flows Constant pre-payment rates (CPR) 1% - 3% Mortgage servicing rights 251,498 Discounted cash flows CPR 6.5% - 7.9% Discount rate 9.53 - 11.04 Maturity (months) 323 - 357 Delinquencies 0.35 - 1.96 Costs to service $ 66 - $ 226 Additive delinquent costs to service $ 175 - $ 1,000 Derivative financial instruments (mortgage 5,611 Sales cash flows Expected closing ratio 70% - 95% interest rate lock commitments) Expected delivery price 98.77 bps - 108.32 bps The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a nonrecurring basis that were categorized within the Level 3 of the fair value hierarchy: Fair Value at Valuation Unobservable March 31, 2017 Technique Input Range (in thousands) Impaired loans $ 51,274 Appraisal of collateral Appraisal adjustments 5% - 10% Foreclosed assets 19,047 Appraisal of collateral Appraisal adjustments 5% - 10%
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets	Key economic assumptions used in the measuring of the fair value of the mortgage servicing rights and the sensitivity of the fair value to immediate adverse changes in those assumptions at March 31, 2017 are presented in the following table. This table does not take into account the derivatives used to economically hedge the mortgage servicing rights. (dollars in thousands, except for weighted average cost to service) March 31, 2017 Weighted average CPR 7.20 % Impact on fair value of 10% adverse change $ (7,847 ) Impact on fair value of 20% adverse change (15,282 ) Weighted average discount rate 9.80 % Impact on fair value of 10% adverse change $ (10,799 ) Impact on fair value of 20% adverse change (20,750 ) Weighted average delinquency rate 1.81 % Impact on fair value of 10% adverse change $ (2,466 ) Impact on fair value of 20% adverse change (4,353 ) Weighted average costs to service $ 89 Impact on fair value of 10% adverse change (4,719 ) Impact on fair value of 20% adverse change (9,438 )
Financial Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)	The following table presents additional information about financial assets measured at fair value on a recurring basis for which the Company used significant unobservable inputs (Level 3): Three Months Ended March 31, 2017 2016 2017 2016 2017 2016 (in thousands) Investment Securities Mortgage Servicing Rights Derivatives Balance, beginning of period $ 544 $ 773 $ 238,011 $ 168,162 $ 3,160 $ 3,822 Purchases — — 496 154 — — Originations — — 15,651 11,856 — — Included in earnings — — (2,660 ) (34,372 ) 2,451 4,397 Principal payments (35 ) (83 ) — — — — Sales — — — — — — Balance, ending of period $ 509 $ 690 $ 251,498 $ 145,800 $ 5,611 $ 8,219
Assets Measured at Fair Value on a Nonrecurring Basis	Assets measured at fair value on a nonrecurring basis as of March 31, 2017 and December 31, 2016 are included in the table below (in thousands): Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) March 31, 2017 Financial assets: Impaired loans $ 51,274 $ — $ — $ 51,274 Non-financial assets: Foreclosed assets 19,047 — — 19,047 December 31, 2016 Financial assets: Impaired loans $ 54,576 $ — $ — $ 54,576 Non-financial assets: Foreclosed assets 31,607 — — 31,607
Estimated Fair Values of Financial Instruments	The estimated fair values of financial instruments are as follows (in thousands): March 31, 2017 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets: Cash and due from banks $ 368,078 $ 368,078 $ 368,078 $ — $ — Interest earning deposits with banks 102,328 102,328 102,328 — — Investment securities available for sale 1,657,950 1,657,950 10,885 1,646,556 509 Investment securities held to maturity 1,056,008 1,083,998 — 1,083,998 — Non-marketable securities - FHLB and FRB stock 144,427 144,427 — — 144,427 Loans held for sale 493,261 493,261 — 493,261 — Loans, net 12,814,311 12,913,824 — 16,029 12,897,795 Accrued interest receivable 58,348 58,348 58,348 — — Derivative financial instruments 37,942 37,942 858 31,473 5,611 Financial Liabilities: Non-interest bearing deposits $ 6,211,173 $ 6,211,173 $ 6,211,173 $ — $ — Interest bearing deposits 7,788,210 7,782,914 — — 7,782,914 Short-term borrowings 1,550,628 1,550,730 — — 1,550,730 Long-term borrowings 315,618 320,655 — — 320,655 Junior subordinated notes issued to capital trusts 210,769 165,889 — — 165,889 Accrued interest payable 4,469 4,469 4,469 — — Derivative financial instruments 49,895 49,895 3,370 46,525 — December 31, 2016 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Financial Assets: Cash and due from banks $ 364,783 $ 364,783 $ 364,783 $ — $ — Interest earning deposits with banks 98,686 98,686 98,686 — — Investment securities available for sale 1,696,195 1,696,195 10,828 1,684,823 544 Investment securities held to maturity 1,069,750 1,093,740 — 1,093,740 — Non-marketable securities - FHLB and FRB stock 143,276 143,276 — — 143,276 Loans held for sale 716,883 716,883 — 716,883 — Loans, net 12,629,437 12,747,107 — 16,273 12,730,834 Accrued interest receivable 59,024 59,024 59,024 — — Derivative financial instruments 44,586 44,586 7,687 33,739 3,160 Financial Liabilities: Non-interest bearing deposits $ 6,408,169 $ 6,408,169 $ 6,408,169 $ — $ — Interest bearing deposits 7,702,279 7,698,839 — — 7,698,839 Short-term borrowings 1,569,288 1,569,314 — — 1,569,314 Long-term borrowings 311,790 317,028 — — 317,028 Junior subordinated notes issued to capital trusts 210,668 157,098 — — 157,098 Accrued interest payable 4,288 4,288 4,288 — — Derivative financial instruments 63,885 63,885 2,046 61,839 —

Stock Incentive Plans (Tables)

Stock Incentive Plans (Tables)	3 Months Ended
	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-Based Payment Plans	The following table summarizes the impact of the Company’s share-based payment plans in the financial statements for the periods shown (in thousands): Three Months Ended March 31, 2017 2016 Total compensation expense for share-based payment plans during the period $ 4,481 $ 4,051 Amount of related income tax benefit recognized in income 4,422 $ 1,583
Summary of Changes in Stock Options	The following table summarizes changes in stock options for the three months ended March 31, 2017 : Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Term (In Years) Aggregate Intrinsic Value (in thousands) Options outstanding as of December 31, 2016 1,940,405 $ 27.45 5.31 Granted 155,059 45.59 Exercised (150,829 ) 26.83 Expired — — Forfeited or cancelled (6,518 ) 30.05 Options outstanding as of March 31, 2017 1,938,117 $ 28.94 5.59 $ 27,368 Options exercisable as of March 31, 2017 1,281,740 $ 26.95 4.09 $ 20,378
Assumptions Used for Options Granted	The following assumptions were used for options granted during the three months ended March 31, 2017 : March 31, 2017 Risk-free interest rate 2.19 % Expected volatility of Company’s stock 22.65 % Expected dividend yield 1.66 % Expected life of options 5.9 years Weighted average fair value per option of options granted during the year $ 9.49
Summary of Changes in Restricted Shares and Units	The following is a summary of changes in restricted shares and units for the three months ended March 31, 2017 : Number of Shares and Units Weighted Average Grant Date Fair Value Shares and units outstanding at December 31, 2016 998,807 $ 31.20 Granted 371,856 45.85 Vested (327,008 ) 31.09 Forfeited or cancelled (7,739 ) 29.92 Shares and units outstanding at March 31, 2017 1,035,916 36.50

Derivative Financial Instrume39

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Derivative Financial Instruments	The Company’s derivative financial instruments are summarized below as of March 31, 2017 and December 31, 2016 (in thousands): Asset Derivatives Liability Derivatives March 31, 2017 December 31, 2016 March 31, 2017 December 31, 2016 Notional Estimated Notional Estimated Notional Estimated Notional Estimated Amount Fair Value Amount Fair Value Amount Fair Value Amount Fair Value Derivative instruments designated as hedges of fair value: Interest rate swap contracts (1) $ — $ — $ — $ — $ 95 $ (3 ) $ 107 $ (4 ) Stand-alone derivative instruments: (2) Interest rate swap contracts 1,353,075 23,460 1,310,057 25,471 1,353,057 (23,460 ) 1,310,057 (25,471 ) Interest rate options contracts 268,130 1,207 217,546 881 268,130 (1,207 ) 217,546 (881 ) Foreign exchange contracts 40,176 2,010 40,641 4,429 39,875 (1,870 ) 40,505 (4,265 ) Spot foreign exchange contracts 2,333 48 1,691 12 563 (30 ) 660 (5 ) Mortgage related derivatives: Interest rate swap contracts 516,000 4,748 383,000 2,946 1,138,000 (19,955 ) 1,458,000 (31,212 ) Treasury futures contracts 37,500 223 15,500 41 — — — — TBA mortgage securities 83,000 582 — — — — 55,000 (132 ) Forward loan sale commitments 65,000 53 585,000 7,646 670,000 (3,370 ) 386,000 (1,915 ) Interest rate lock commitments 550,073 5,611 543,901 3,160 — — — — Total stand-alone derivative instruments 2,915,287 37,942 3,097,336 44,586 3,469,625 (49,892 ) 3,467,768 (63,881 ) Total $ 2,915,287 $ 37,942 $ 3,097,336 $ 44,586 $ 3,469,720 $ (49,895 ) $ 3,467,875 $ (63,885 ) (1) Derivative instruments designated to hedge fixed-rate commercial real estate loans. (2) These portfolio swaps are not designated as hedging instruments under ASC Topic 815.
Schedule of the Amounts Included in Consolidated Statements of Operations Related to Derivative Financial Instruments	Amounts included in other operating income in the consolidated statements of operations related to derivative financial instruments were as follows (in thousands): Three Months Ended March 31, 2017 2016 Derivative instruments designated as hedges of fair value: Interest rate swap contracts $ 1 $ 1 Stand-alone derivative instruments: Interest rate swap contracts 1,849 2,338 Interest rate options contracts — 36 Foreign exchange contracts 63 128 Spot foreign exchange contracts 678 303 Mortgage related derivatives (10,141 ) 23,711 Total stand-alone derivative instruments (7,551 ) 26,516 Total $ (7,550 ) $ 26,517
Schedule of Financial Instruments Eligible for Offset In the Consolidated Balance Sheet	Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of March 31, 2017 is summarized below (in thousands): Financial Assets Financial Liabilities Gross Amount Recognized Gross Amount Offset Net Amount Recognized Gross Amount Recognized Gross Amount Offset Net Amount Recognized Derivatives: Interest rate swap contracts, caps and floors $ 8,509 $ — $ 8,509 $ 16,255 $ — $ 16,255 Foreign exchange contracts 1,661 — 1,661 1,008 — 1,008 Mortgage related derivatives 5,606 — 5,606 23,325 — 23,325 Total derivatives 15,776 — 15,776 40,588 — 40,588 Repurchase agreements — — — 182,128 — 182,128 Total $ 15,776 $ — $ 15,776 $ 222,716 $ — $ 222,716 Financial Assets Financial Liabilities Net Amount Recognized Financial Instruments Collateral Net Amount Net Amount Recognized Financial Instruments Collateral Net Amount Derivatives: Counterparty A $ 4,647 $ (4,647 ) $ — $ — $ 11,616 $ (4,647 ) $ (6,969 ) $ — Counterparty B 5,567 (5,567 ) — — 11,088 (5,567 ) (5,521 ) — Counterparty C 3,504 (3,504 ) — — 6,325 (3,504 ) (2,821 ) — Other counterparties 2,058 (1,956 ) — 102 11,559 (1,956 ) (9,603 ) — Total derivatives 15,776 (15,674 ) — 102 40,588 (15,674 ) (24,914 ) — Repurchase agreements — — — — 182,128 — (182,128 ) — Total $ 15,776 $ (15,674 ) $ — $ 102 $ 222,716 $ (15,674 ) $ (207,042 ) $ — Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of December 31, 2016 is summarized below (in thousands): Financial Assets Financial Liabilities Gross Amount Recognized Gross Amount Offset Net Amount Recognized Gross Amount Recognized Gross Amount Offset Net Amount Recognized Derivatives: Interest rate swap contracts, caps and floors $ 7,885 $ — $ 7,885 $ 18,564 $ — $ 18,564 Foreign exchange contracts 4,315 — 4,315 1,674 — 1,674 Mortgage related derivatives 10,633 — 10,633 33,259 — 33,259 Total derivatives 22,833 — 22,833 53,497 — 53,497 Repurchase agreements — — — 237,538 — 237,538 Total $ 22,833 $ — $ 22,833 $ 291,035 $ — $ 291,035 Financial Assets Financial Liabilities Net Amount Recognized Financial Instruments Collateral Net Amount Net Amount Recognized Financial Instruments Collateral Net Amount Derivatives: Counterparty A $ 2,697 $ (2,697 ) $ — $ — $ 18,768 $ (2,697 ) $ (16,071 ) $ — Counterparty B 4,683 (4,683 ) — — 12,881 (4,683 ) (8,198 ) — Counterparty C 64 (64 ) — — 4,919 (64 ) (4,855 ) — Other counterparties 15,389 (10,938 ) — 4,451 16,929 (10,938 ) (5,980 ) 11 Total derivatives 22,833 (18,382 ) — 4,451 53,497 (18,382 ) (35,104 ) 11 Repurchase agreements — — — — 237,538 — (237,538 ) — Total $ 22,833 $ (18,382 ) $ — $ 4,451 $ 291,035 $ (18,382 ) $ (272,642 ) $ 11

Operating Segments (Tables)

Operating Segments (Tables)	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Summary Financial Information for the Reportable Segments	The following tables present summary financial information for the reportable segments (in thousands): Banking Leasing Mortgage Banking Consolidated Three months ended March 31, 2017 Net interest income $ 131,449 $ 2,269 $ 9,325 $ 143,043 Provision for credit losses 3,527 (135 ) 342 3,734 Non-interest income 42,531 21,463 27,779 91,773 Non-interest expense (1) 107,839 13,844 33,982 155,665 Income tax expense 15,660 4,119 1,101 20,880 Net income $ 46,954 $ 5,904 $ 1,679 $ 54,537 Total assets $ 16,009,339 $ 1,173,558 $ 1,963,165 $ 19,146,062 Three months ended March 31, 2016 Net interest income $ 109,608 $ 2,423 $ 7,273 $ 119,304 Provision for credit losses 7,001 437 125 7,563 Non-interest income 35,019 19,195 27,479 81,693 Non-interest expense (1) 90,640 12,186 32,974 135,800 Income tax expense 14,350 3,509 661 18,520 Net income $ 32,636 $ 5,486 $ 992 $ 39,114 Total assets $ 13,235,848 $ 1,045,117 $ 1,294,688 $ 15,575,653 (1) Includes merger related and repositioning expenses of $258 thousand and $3.3 million in the Banking Segment for the three months ended March 31, 2017 and 2016 , respectively.

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 54,537	$ 39,114
Less: preferred stock dividends	2,003	2,000
Net income available to common stockholders	52,534	37,114
Plus: preferred stock dividends on convertible preferred stock	3	0
Earnings allocated to common stockholders for diluted earnings per common share	$ 52,536	$ 37,112
Weighted average shares outstanding for basic earnings per common share (in shares)	83,662,430	73,330,731
Dilutive effect of convertible preferred stock (in shares)	7,322	0
Total dilutive effect of equity awards and convertible preferred stock	1,115,700	636,204
Weighted average shares outstanding for diluted earnings per common share (in shares)	84,778,130	73,966,935
Basic earnings per common share (in dollars per share)	$ 0.63	$ 0.51
Diluted earnings per common share (in dollars per share)	$ 0.62	$ 0.50
Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Distributed earnings allocated to common stock	$ 16,131	$ 12,654
Undistributed earnings	38,406	26,460
Net income	54,537	39,114
Net income available to common stockholders	$ 52,534	$ 37,114
Weighted average shares outstanding for basic earnings per common share (in shares)	83,662,430	73,330,731
Weighted average shares outstanding for diluted earnings per common share (in shares)	84,778,130	73,966,935
Participating Securities
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Less: earnings allocated to participating securities	$ 1	$ 2
Stock options
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of stock options and restricted shares/units	636,515	237,556
Restricted shares and units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of stock options and restricted shares/units	471,863	398,648

Business Combinations (Details

Business Combinations (Details 1) - USD ($)		Aug. 24, 2016	Nov. 20, 2015	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill				$ 999,925,000		$ 1,001,038,000
Accretable discount on loans				7,158,000	$ 7,156,000
American Chartered Bancorp, Inc.
Business Acquisition [Line Items]
Total identifiable net assets		$ 487,416,000
Cash paid		102,317,000
Preferred stock and stock-based awards assumed		2,300,000
Goodwill		274,885,000
Increase in fair value estimates				1,800,000
Decrease in deferred tax asset				733,000
Decrease to goodwill				$ 1,100,000
Acquisition costs incurred						$ 2,000,000
American Chartered Bancorp, Inc. | Purchased Credit-Impaired Loans
Business Acquisition [Line Items]
Best estimate of contractual cash flows not expected to be collected		18,400,000
Accretable discount		5,300,000
American Chartered Bancorp, Inc. | Substandard
Business Acquisition [Line Items]
Accretable discount on loans		20,700,000
American Chartered Bancorp, Inc. | Common Stock
Business Acquisition [Line Items]
Market value of common stock and Series B preferred stock		$ 382,769,000
Stock issued (in shares)	[1]	9,744,636
American Chartered Bancorp, Inc.
Business Acquisition [Line Items]
Amount called by each warrant or right (in dollars per share)			$ 9.30
Amount paid for each fractional share (in dollars per share)			$ 39.01
American Chartered Bancorp, Inc. | Common Stock
Business Acquisition [Line Items]
Number of securities called by each warrant (in shares)			0.2732
Series D Preferred Stock | American Chartered Bancorp, Inc.
Business Acquisition [Line Items]
Preferred stock, dividend rate (percent)		8.00%
Series B Preferred Stock
Business Acquisition [Line Items]
Preferred stock, dividend rate (percent)			8.00%	8.00%		8.00%
Series B Preferred Stock | American Chartered Merger
Business Acquisition [Line Items]
Preferred stock, dividend rate (percent)			8.00%
Series B Preferred Stock | American Chartered Bancorp, Inc.
Business Acquisition [Line Items]
Number of securities called by each warrant (in shares)		1
Preferred stock, dividend rate (percent)		8.00%
[1]	Per share fair value amount determined as if the shares of Series B were converted into shares common stock.

Business Combinations (Detail43

Business Combinations (Details 2) - USD ($) $ / shares in Units, $ in Thousands		Aug. 24, 2016	Mar. 31, 2017	Dec. 31, 2016
ASSETS
Goodwill			$ 999,925	$ 1,001,038
American Chartered Bancorp, Inc.
ASSETS
Cash and cash equivalents		$ 93,307
Investment securities available for sale		505,564
Non-marketable securities - FRB and FHLB Stock		16,000
Loans		1,942,548
Premises and equipment		39,048
Cash surrender value of life insurance		59,917
Goodwill		274,885
Other intangibles		25,452
Other real estate owned		3,960
Other assets		31,408
Total assets		2,992,089
LIABILITIES
Deposits		2,389,327
Short-term borrowings		48,305
Long-term borrowings		16,000
Accrued expenses and other liabilities		22,966
Total liabilities		2,504,673
Total identifiable net assets		487,416
Consideration:
Stock-based compensation attributed to pre-business combination service		1,103
Cash paid		102,317
Total fair value of consideration, excluding Series B preferred stock		487,416
American Chartered Bancorp, Inc. | Common Stock
Consideration:
Market value of common stock and Series B preferred stock		$ 382,769
Stock issued (in dollars per share)	[1]	$ 39.28
Stock issued (in shares)	[1]	9,744,636
American Chartered Bancorp, Inc. | Preferred Stock | Series B Preferred Stock
Consideration:
Market value of common stock and Series B preferred stock	[1]	$ 1,227
Stock issued (in dollars per share)	[1]	$ 2,337.97
Stock issued (in shares)	[1]	525
American Chartered Bancorp, Inc. | Junior Subordinated Notes
LIABILITIES
Long-term borrowings		$ 28,075
[1]	Per share fair value amount determined as if the shares of Series B were converted into shares common stock.

Business Combinations (Detail44

Business Combinations (Details 3) - American Chartered Bancorp, Inc. $ in Thousands	Aug. 24, 2016USD ($)
Purchased Credit-Impaired Loans
Business Acquisition [Line Items]
Fair value	$ 62,104
Gross contractual amounts receivable	93,490
Best estimate of contractual cash flows not expected to be collected	22,293	[1]
Best estimate of contractual cash flows expected to be collected	71,197
Purchased Non-Credit-Impaired Loans
Business Acquisition [Line Items]
Fair value	1,880,444
Gross contractual amounts receivable	2,149,868
Best estimate of contractual cash flows not expected to be collected	114,154	[1]
Best estimate of contractual cash flows expected to be collected	$ 2,035,714
[1]	Includes interest payments not expected to be collected due to loan prepayments as well as principal and interest payments not expected to be collected due to customer defaults.

Business Combinations (Detail45

Business Combinations (Details 4) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)
Business Combinations [Abstract]
Total revenues (net interest income plus non-interest income	$ 231,760
Net income	$ 47,424

Investment Securities (Details)

Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Available for Sale
Amortized Cost	$ 1,641,866	$ 1,684,665
Gross Unrealized Gains	26,624	24,205
Gross Unrealized Losses	(10,540)	(12,675)
Fair Value	1,657,950	1,696,195
Held to Maturity
Amortized Cost	1,056,008	1,069,750
Gross Unrealized Gains	29,920	27,029
Gross Unrealized Losses	(1,930)	(3,039)
Fair Value	1,083,998	1,093,740
Total Available for Sale and Held to Maturity Investment Securities
Amortized Cost	2,697,874	2,754,415
Gross Unrealized Gains	56,544	51,234
Gross Unrealized Losses	(12,470)	(15,714)
Fair Value	2,741,948	2,789,935
U.S. Government sponsored agencies and enterprises
Available for Sale
Amortized Cost	23,204	23,267
Gross Unrealized Gains	126	148
Gross Unrealized Losses	0	0
Fair Value	23,330	23,415
States and political subdivisions
Available for Sale
Amortized Cost	371,329	376,541
Gross Unrealized Gains	18,480	15,669
Gross Unrealized Losses	(700)	(845)
Fair Value	389,109	391,365
Held to Maturity
Amortized Cost	910,336	910,608
Gross Unrealized Gains	25,863	21,609
Gross Unrealized Losses	(1,930)	(3,039)
Fair Value	$ 934,269	929,178
Total Available for Sale and Held to Maturity Investment Securities
Percentage of securities consisting general obligation issues	95.00%
Percentage of securities insured	27.00%
States and political subdivisions | State of Illinois
Total Available for Sale and Held to Maturity Investment Securities
Percentage of investments issued by states and political subdivisions that were within the state of Illinois	21.00%
Residential mortgage-backed securities
Available for Sale
Amortized Cost	$ 969,982	988,744
Gross Unrealized Gains	5,642	5,741
Gross Unrealized Losses	(9,249)	(10,801)
Fair Value	966,375	983,684
Held to Maturity
Amortized Cost	145,672	159,142
Gross Unrealized Gains	4,057	5,420
Gross Unrealized Losses	0	0
Fair Value	149,729	164,562
Commercial mortgage-backed securities
Available for Sale
Amortized Cost	88,959	91,949
Gross Unrealized Gains	1,357	1,221
Gross Unrealized Losses	(162)	(162)
Fair Value	90,154	93,008
Corporate bonds
Available for Sale
Amortized Cost	177,335	193,164
Gross Unrealized Gains	1,019	1,426
Gross Unrealized Losses	(257)	(695)
Fair Value	178,097	193,895
Equity securities
Available for Sale
Amortized Cost	11,057	11,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(172)	(172)
Fair Value	$ 10,885	$ 10,828

Investment Securities (Details

Investment Securities (Details 2) $ in Thousands	Mar. 31, 2017USD ($)Security_Position	Dec. 31, 2016USD ($)Security_Position
Available for Sale
Less Than 12 Months, Fair Value	$ 628,640	$ 705,456
Less Than 12 Months, Unrealized Losses	(9,644)	(11,314)
12 Months or More, Fair Value	75,731	86,690
12 Months or More, Unrealized Losses	(896)	(1,361)
Total Fair Value	704,371	792,146
Total Unrealized Losses	(10,540)	(12,675)
Total
Less Than 12 Months, Fair Value	818,027	949,024
Less Than 12 Months, Unrealized Losses	(11,550)	(14,313)
12 Months or More, Fair Value	77,803	89,678
12 Months or More, Unrealized Losses	(920)	(1,401)
Total Fair Value	895,830	1,038,702
Total Unrealized Losses	$ (12,470)	$ (15,714)
Number of security positions in the investment portfolio in an unrealized loss position | Security_Position	538	615
States and political subdivisions
Available for Sale
Less Than 12 Months, Fair Value	$ 26,994	$ 42,806
Less Than 12 Months, Unrealized Losses	(700)	(845)
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Total Fair Value	26,994	42,806
Total Unrealized Losses	(700)	(845)
Held to Maturity
Less Than 12 Months, Fair Value	189,387	243,568
Less Than 12 Months, Unrealized Losses	(1,906)	(2,999)
12 Months or More, Fair Value	2,072	2,988
12 Months or More, Unrealized Losses	(24)	(40)
Total Fair Value	191,459	246,556
Total Unrealized Losses	(1,930)	(3,039)
Residential mortgage-backed securities
Available for Sale
Less Than 12 Months, Fair Value	568,401	623,732
Less Than 12 Months, Unrealized Losses	(8,666)	(10,084)
12 Months or More, Fair Value	47,389	54,990
12 Months or More, Unrealized Losses	(583)	(717)
Total Fair Value	615,790	678,722
Total Unrealized Losses	(9,249)	(10,801)
Commercial mortgage-backed securities
Available for Sale
Less Than 12 Months, Fair Value	6,955	7,062
Less Than 12 Months, Unrealized Losses	(24)	(9)
12 Months or More, Fair Value	11,558	11,612
12 Months or More, Unrealized Losses	(138)	(153)
Total Fair Value	18,513	18,674
Total Unrealized Losses	(162)	(162)
Corporate bonds
Available for Sale
Less Than 12 Months, Fair Value	15,405	21,028
Less Than 12 Months, Unrealized Losses	(82)	(204)
12 Months or More, Fair Value	16,784	20,088
12 Months or More, Unrealized Losses	(175)	(491)
Total Fair Value	32,189	41,116
Total Unrealized Losses	(257)	(695)
Equity securities
Available for Sale
Less Than 12 Months, Fair Value	10,885	10,828
Less Than 12 Months, Unrealized Losses	(172)	(172)
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Total Fair Value	10,885	10,828
Total Unrealized Losses	$ (172)	$ (172)

Investment Securities (Detail48

Investment Securities (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Amortized cost and fair value of investment securities by contractual maturity
Realized gains	$ 237	$ 21
Realized losses	(6)	(21)
Net gains	231	$ 0
Amortized Cost, Available for sale
Due in one year or less	104,648
Due after one year through five years	107,412
Due after five years through ten years	51,650
Due after ten years	308,158
Amortized Cost	1,641,866		$ 1,684,665
Fair Value, Available for sale
Due in one year or less	105,122
Due after one year through five years	107,636
Due after five years through ten years	52,294
Due after ten years	325,484
Fair Value	1,657,950		1,696,195
Amortized Cost, Held to maturity
Due in one year or less	58,499
Due after one year through five years	78,436
Due after five years through ten years	211,260
Due after ten years	562,141
Investment securities held to maturity	1,056,008		1,069,750
Fair value, Held to maturity
Due in one year or less	58,576
Due after one year through five years	79,374
Due after five years through ten years	220,766
Due after ten years	575,553
Fair Value	1,083,998		1,093,740
Total Available for Sale and Held to Maturity Investment Securities
Amortized Cost	2,697,874		2,754,415
Fair Value	2,741,948		2,789,935
Pledged financial instruments, not separately reported, securities	906,600		1,000,000
Pledged financial instruments, not separately reported, securities required to be pledged	685,900		756,500
Equity securities
Amortized Cost, Available for sale
Amortized Cost	11,057		11,000
Fair Value, Available for sale
Fair Value	10,885		10,828
Residential and commercial mortgage-backed securities
Amortized Cost, Available for sale
Amortized Cost	1,058,941
Fair Value, Available for sale
Fair Value	1,056,529
Residential mortgage-backed securities
Amortized Cost, Available for sale
Amortized Cost	969,982		988,744
Fair Value, Available for sale
Fair Value	966,375		983,684
Amortized Cost, Held to maturity
Investment securities held to maturity	145,672		159,142
Fair value, Held to maturity
Fair Value	$ 149,729		$ 164,562

Loans (Details)

Loans (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)category	Dec. 31, 2016USD ($)	Mar. 31, 2016USD ($)
Loans
Total loans, excluding purchased credit-impaired loans	$ 12,789,667	$ 12,605,726
Purchased credit-impaired loans	168,814	163,077
Total loans	$ 12,958,481	12,768,803	$ 9,961,348
Number of highest rating categories by rating services company | category	1
Number of highest rating categories to be achieved for classification as investment grade companies | category	4
Percentage of collateral pledge of first mortgage loans as per agreement (minimum)	133.00%
Percentage of collateral pledge of home equity loans as per agreement	250.00%
Loans pledged as collateral for long-term Federal Home Loan Bank advances	$ 4,300,000	5,500,000
Loans required to be pledged as collateral for long-term Federal Home Loan Bank advances	3,400,000	3,200,000
Commercial loans
Loans
Total loans, excluding purchased credit-impaired loans	4,364,122	4,346,506
Total loans	4,388,890		3,535,528
Commercial loans collateralized by assignment of lease payments
Loans
Total loans, excluding purchased credit-impaired loans	2,008,601	2,002,976
Total loans	2,008,601		1,774,104
Commercial real estate
Loans
Total loans, excluding purchased credit-impaired loans	3,734,171	3,788,016
Total loans	3,780,854		2,861,139
Residential real estate
Loans
Total loans, excluding purchased credit-impaired loans	1,227,218	1,060,828
Total loans	1,304,550		733,188
Construction real estate
Loans
Total loans, excluding purchased credit-impaired loans	554,942	518,562
Total loans	560,566		324,137
Indirect vehicle
Loans
Total loans, excluding purchased credit-impaired loans	573,792	541,680
Total loans	573,792		432,915
Home equity
Loans
Total loans, excluding purchased credit-impaired loans	246,805	266,377
Other consumer loans
Loans
Total loans, excluding purchased credit-impaired loans	80,016	$ 80,781
Total loans	$ 82,041		$ 79,905

Loans (Details 2)

Loans (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Contractual aging of the recorded investment in loans
Total loans, excluding covered loans	$ 12,789,667	$ 12,605,726
Total loans	$ 12,958,481	12,768,803	$ 9,961,348
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Period past due of recorded investment in loans (in days)	90 days
Non-performing loan aging
Contractual aging of the recorded investment in loans
Current	$ 21,864	28,364
Past Due	27,337	30,988
Total loans	49,201	59,352
30-59 Days Past Due | Non-performing loan aging
Contractual aging of the recorded investment in loans
Past Due	5,765	2,308
60-89 Days Past Due | Non-performing loan aging
Contractual aging of the recorded investment in loans
Past Due	1,461	978
Loans Past Due 90 Days or More | Non-performing loan aging
Contractual aging of the recorded investment in loans
Past Due	20,111	27,702
Commercial
Contractual aging of the recorded investment in loans
Current	4,356,793	4,337,348
Past Due	7,329	9,158
Total loans, excluding covered loans	4,364,122	4,346,506
Total loans	4,388,890		3,535,528
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	6,575	11,222
Loans past due 90 days or more and still accruing	0	1,406
Commercial | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,197	2,515
Commercial | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	70	156
Commercial | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	5,062	6,487
Commercial loans collateralized by assignment of lease payments
Contractual aging of the recorded investment in loans
Current	1,992,906	1,989,934
Past Due	15,695	13,042
Total loans, excluding covered loans	2,008,601	2,002,976
Total loans	2,008,601		1,774,104
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	1,129	1,364
Loans past due 90 days or more and still accruing	1,035	1,197
Commercial loans collateralized by assignment of lease payments | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	12,664	9,229
Commercial loans collateralized by assignment of lease payments | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	1,267	1,869
Commercial loans collateralized by assignment of lease payments | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	1,764	1,944
Healthcare
Contractual aging of the recorded investment in loans
Current	594,225	582,450
Past Due	0	0
Total loans, excluding covered loans	594,225	582,450
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	0	0
Loans past due 90 days or more and still accruing	0	0
Healthcare | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Healthcare | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Healthcare | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	0	0
Industrial
Contractual aging of the recorded investment in loans
Current	834,842	825,715
Past Due	3,171	7,678
Total loans, excluding covered loans	838,013	833,393
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	2,185	276
Loans past due 90 days or more and still accruing	562	1,064
Industrial | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	907	3,045
Industrial | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	3,293
Industrial | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	2,264	1,340
Multifamily
Contractual aging of the recorded investment in loans
Current	515,137	547,107
Past Due	1,304	890
Total loans, excluding covered loans	516,441	547,997
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	3,160	2,662
Loans past due 90 days or more and still accruing	19	0
Multifamily | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	808	458
Multifamily | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	181	53
Multifamily | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	315	379
Retail
Contractual aging of the recorded investment in loans
Current	498,262	506,789
Past Due	270	568
Total loans, excluding covered loans	498,532	507,357
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	369	384
Loans past due 90 days or more and still accruing	0	0
Retail | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	90	568
Retail | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	180	0
Retail | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	0	0
Office
Contractual aging of the recorded investment in loans
Current	402,893	405,992
Past Due	3,801	7,206
Total loans, excluding covered loans	406,694	413,198
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	2,095	896
Loans past due 90 days or more and still accruing	0	6,381
Office | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,173	350
Office | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	1,280	475
Office | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	348	6,381
Other
Contractual aging of the recorded investment in loans
Current	877,080	899,950
Past Due	3,186	3,671
Total loans, excluding covered loans	880,266	903,621
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	80	83
Loans past due 90 days or more and still accruing	249	21
Other | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,505	2,385
Other | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	127	1,155
Other | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	554	131
Residential real estate
Contractual aging of the recorded investment in loans
Current	1,210,411	1,041,189
Past Due	16,807	19,639
Total loans, excluding covered loans	1,227,218	1,060,828
Total loans	1,304,550		733,188
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	17,206	16,538
Loans past due 90 days or more and still accruing	270	235
Residential real estate | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	8,586	8,248
Residential real estate | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	1,408	3,409
Residential real estate | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	6,813	7,982
Construction real estate
Contractual aging of the recorded investment in loans
Current	554,645	518,171
Past Due	297	391
Total loans, excluding covered loans	554,942	518,562
Total loans	560,566		324,137
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	0	0
Loans past due 90 days or more and still accruing	0	0
Construction real estate | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	297	0
Construction real estate | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	391
Construction real estate | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	0	0
Indirect vehicle
Contractual aging of the recorded investment in loans
Current	570,575	537,221
Past Due	3,217	4,459
Total loans, excluding covered loans	573,792	541,680
Total loans	573,792		432,915
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	2,113	2,355
Loans past due 90 days or more and still accruing	0	10
Indirect vehicle | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,161	2,836
Indirect vehicle | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	708	1,062
Indirect vehicle | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	348	561
Home equity
Contractual aging of the recorded investment in loans
Current	241,346	261,765
Past Due	5,459	4,612
Total loans, excluding covered loans	246,805	266,377
Total loans	259,187		220,432
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	12,124	13,187
Loans past due 90 days or more and still accruing	0	0
Home equity | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,458	1,219
Home equity | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	47	815
Home equity | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	2,954	2,578
Other consumer
Contractual aging of the recorded investment in loans
Current	79,726	80,443
Past Due	290	338
Total loans, excluding covered loans	80,016	80,781
Total loans	82,041		$ 79,905
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	6	7
Loans past due 90 days or more and still accruing	24	64
Other consumer | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	176	152
Other consumer | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	88	120
Other consumer | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	26	66
Total loans, excluding purchased credit-impaired loans
Contractual aging of the recorded investment in loans
Current	12,728,841	12,534,074
Past Due	60,826	71,652
Total loans, excluding covered loans	12,789,667	12,605,726
Total loans, excluding purchased credit-impaired loans | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	35,022	31,005
Total loans, excluding purchased credit-impaired loans | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	5,356	12,798
Total loans, excluding purchased credit-impaired loans | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	20,448	27,849
Purchased credit-impaired loans
Contractual aging of the recorded investment in loans
Current	87,050	86,169
Past Due	81,764	76,908
Total loans	168,814	163,077
Purchased credit-impaired loans | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	13,383	6,546
Purchased credit-impaired loans | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	4,984	6,600
Purchased credit-impaired loans | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	63,397	63,762
Total loans
Contractual aging of the recorded investment in loans
Current	12,815,891	12,620,243
Past Due	142,590	148,560
Total loans	12,958,481	12,768,803
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	47,042	48,974
Loans past due 90 days or more and still accruing	2,159	10,378
Total loans | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	48,405	37,551
Total loans | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	10,340	19,398
Total loans | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	$ 83,845	$ 91,611

Loans (Details 3)

Loans (Details 3) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Loans
Total loans, excluding purchased credit-impaired loans	$ 12,789,667	$ 12,605,726
Substandard and doubtful loans non-performing	15,600	17,300
Commercial
Loans
Total loans, excluding purchased credit-impaired loans	4,364,122	4,346,506
Commercial loans collateralized by assignment of lease payments
Loans
Total loans, excluding purchased credit-impaired loans	2,008,601	2,002,976
Healthcare
Loans
Total loans, excluding purchased credit-impaired loans	594,225	582,450
Industrial
Loans
Total loans, excluding purchased credit-impaired loans	838,013	833,393
Multifamily
Loans
Total loans, excluding purchased credit-impaired loans	516,441	547,997
Retail
Loans
Total loans, excluding purchased credit-impaired loans	498,532	507,357
Office
Loans
Total loans, excluding purchased credit-impaired loans	406,694	413,198
Other
Loans
Total loans, excluding purchased credit-impaired loans	880,266	903,621
Construction real estate
Loans
Total loans, excluding purchased credit-impaired loans	554,942	518,562
Pass
Loans
Total loans, excluding purchased credit-impaired loans	10,248,886	10,255,548
Pass | Commercial
Loans
Total loans, excluding purchased credit-impaired loans	4,128,984	4,127,397
Pass | Commercial loans collateralized by assignment of lease payments
Loans
Total loans, excluding purchased credit-impaired loans	1,994,532	1,981,689
Pass | Healthcare
Loans
Total loans, excluding purchased credit-impaired loans	563,680	545,663
Pass | Industrial
Loans
Total loans, excluding purchased credit-impaired loans	805,925	814,668
Pass | Multifamily
Loans
Total loans, excluding purchased credit-impaired loans	511,625	544,071
Pass | Retail
Loans
Total loans, excluding purchased credit-impaired loans	490,494	498,458
Pass | Office
Loans
Total loans, excluding purchased credit-impaired loans	397,054	404,811
Pass | Other
Loans
Total loans, excluding purchased credit-impaired loans	801,650	820,229
Pass | Construction real estate
Loans
Total loans, excluding purchased credit-impaired loans	554,942	518,562
Special Mention
Loans
Total loans, excluding purchased credit-impaired loans	243,548	238,651
Special Mention | Commercial
Loans
Total loans, excluding purchased credit-impaired loans	138,056	113,838
Special Mention | Commercial loans collateralized by assignment of lease payments
Loans
Total loans, excluding purchased credit-impaired loans	6,191	16,010
Special Mention | Healthcare
Loans
Total loans, excluding purchased credit-impaired loans	21,631	32,251
Special Mention | Industrial
Loans
Total loans, excluding purchased credit-impaired loans	26,657	17,962
Special Mention | Multifamily
Loans
Total loans, excluding purchased credit-impaired loans	449	312
Special Mention | Retail
Loans
Total loans, excluding purchased credit-impaired loans	5,455	8,350
Special Mention | Office
Loans
Total loans, excluding purchased credit-impaired loans	4,827	5,299
Special Mention | Other
Loans
Total loans, excluding purchased credit-impaired loans	40,282	44,629
Special Mention | Construction real estate
Loans
Total loans, excluding purchased credit-impaired loans	0	0
Substandard
Loans
Total loans, excluding purchased credit-impaired loans	169,402	161,861
Substandard | Commercial
Loans
Total loans, excluding purchased credit-impaired loans	97,082	105,271
Substandard | Commercial loans collateralized by assignment of lease payments
Loans
Total loans, excluding purchased credit-impaired loans	7,878	5,277
Substandard | Healthcare
Loans
Total loans, excluding purchased credit-impaired loans	8,914	4,536
Substandard | Industrial
Loans
Total loans, excluding purchased credit-impaired loans	5,431	763
Substandard | Multifamily
Loans
Total loans, excluding purchased credit-impaired loans	4,367	3,614
Substandard | Retail
Loans
Total loans, excluding purchased credit-impaired loans	2,583	549
Substandard | Office
Loans
Total loans, excluding purchased credit-impaired loans	4,813	3,088
Substandard | Other
Loans
Total loans, excluding purchased credit-impaired loans	38,334	38,763
Substandard | Construction real estate
Loans
Total loans, excluding purchased credit-impaired loans	0	0
Doubtful
Loans
Total loans, excluding purchased credit-impaired loans	0	0
Doubtful | Commercial
Loans
Total loans, excluding purchased credit-impaired loans	0	0
Doubtful | Commercial loans collateralized by assignment of lease payments
Loans
Total loans, excluding purchased credit-impaired loans	0	0
Doubtful | Healthcare
Loans
Total loans, excluding purchased credit-impaired loans	0	0
Doubtful | Industrial
Loans
Total loans, excluding purchased credit-impaired loans	0	0
Doubtful | Multifamily
Loans
Total loans, excluding purchased credit-impaired loans	0	0
Doubtful | Retail
Loans
Total loans, excluding purchased credit-impaired loans	0	0
Doubtful | Office
Loans
Total loans, excluding purchased credit-impaired loans	0	0
Doubtful | Other
Loans
Total loans, excluding purchased credit-impaired loans	0	0
Doubtful | Construction real estate
Loans
Total loans, excluding purchased credit-impaired loans	0	0
Total
Loans
Total loans, excluding purchased credit-impaired loans	10,661,836	10,656,060
Total | Commercial
Loans
Total loans, excluding purchased credit-impaired loans	4,364,122	4,346,506
Total | Commercial loans collateralized by assignment of lease payments
Loans
Total loans, excluding purchased credit-impaired loans	2,008,601	2,002,976
Total | Healthcare
Loans
Total loans, excluding purchased credit-impaired loans	594,225	582,450
Total | Industrial
Loans
Total loans, excluding purchased credit-impaired loans	838,013	833,393
Total | Multifamily
Loans
Total loans, excluding purchased credit-impaired loans	516,441	547,997
Total | Retail
Loans
Total loans, excluding purchased credit-impaired loans	498,532	507,357
Total | Office
Loans
Total loans, excluding purchased credit-impaired loans	406,694	413,198
Total | Other
Loans
Total loans, excluding purchased credit-impaired loans	880,266	903,621
Total | Construction real estate
Loans
Total loans, excluding purchased credit-impaired loans	$ 554,942	$ 518,562

Loans (Details 4)

Loans (Details 4) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Loans
Total loans, excluding purchased credit-impaired loans	$ 12,789,667	$ 12,605,726
Mortgage loans in process of foreclosure	26,600	29,100
Residential real estate
Loans
Total loans, excluding purchased credit-impaired loans	1,227,218	1,060,828
Indirect vehicle
Loans
Total loans, excluding purchased credit-impaired loans	573,792	541,680
Home equity
Loans
Total loans, excluding purchased credit-impaired loans	246,805	266,377
Other consumer loans
Loans
Total loans, excluding purchased credit-impaired loans	80,016	80,781
Total
Loans
Total loans, excluding purchased credit-impaired loans	2,127,831	1,949,666
Performing | Residential real estate
Loans
Total loans, excluding purchased credit-impaired loans	1,209,742	1,044,055
Performing | Indirect vehicle
Loans
Total loans, excluding purchased credit-impaired loans	571,679	539,315
Performing | Home equity
Loans
Total loans, excluding purchased credit-impaired loans	234,681	253,190
Performing | Other consumer loans
Loans
Total loans, excluding purchased credit-impaired loans	79,986	80,710
Performing | Total
Loans
Total loans, excluding purchased credit-impaired loans	2,096,088	1,917,270
Non-performing | Residential real estate
Loans
Total loans, excluding purchased credit-impaired loans	17,476	16,773
Non-performing | Indirect vehicle
Loans
Total loans, excluding purchased credit-impaired loans	2,113	2,365
Non-performing | Home equity
Loans
Total loans, excluding purchased credit-impaired loans	12,124	13,187
Non-performing | Other consumer loans
Loans
Total loans, excluding purchased credit-impaired loans	30	71
Non-performing | Total
Loans
Total loans, excluding purchased credit-impaired loans	$ 31,743	$ 32,396

Loans (Details 5)

Loans (Details 5) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017USD ($)loan	Dec. 31, 2016USD ($)loan
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	$ 76,941	$ 80,356
Recorded Investment	70,451	73,914
Partial Charge-offs	6,490	6,442
Allowance for Loan Losses Allocated	6,098	8,336
Average Recorded Investment	72,328	87,645
Interest Income Recognized	208	$ 52
Restructured loans	$ 1,719
Minimum period of sustained repayment required to return note to accrual status	6 months
Restructured loans number of A and B structures | loan	1	1
Restructured loans representing A And B structures	$ 906	$ 929
Commercial | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	6,785	9,056
Recorded Investment	6,785	9,056
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	7,561	5,944
Interest Income Recognized	15	0
Commercial | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	8,429	14,403
Recorded Investment	8,429	14,403
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	986	2,889
Average Recorded Investment	8,612	22,737
Interest Income Recognized	147	0
Commercial loans collateralized by assignment of lease payments | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	1,111	1,129
Recorded Investment	729	747
Partial Charge-offs	382	382
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	1,085	1,045
Interest Income Recognized	0	34
Commercial loans collateralized by assignment of lease payments | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	0	2,397
Interest Income Recognized	0	18
Healthcare | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Healthcare | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Industrial | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	1,909	0
Recorded Investment	1,909	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	1,906	402
Interest Income Recognized	0	0
Industrial | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Multifamily | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	2,438	1,922
Recorded Investment	2,438	1,922
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	2,842	2,348
Interest Income Recognized	29	0
Multifamily | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Retail | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	2,646	2,670
Recorded Investment	906	929
Partial Charge-offs	1,740	1,741
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	918	2,165
Interest Income Recognized	0	0
Retail | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	3,572	3,592
Recorded Investment	3,572	3,592
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	286	354
Average Recorded Investment	3,581	6,827
Interest Income Recognized	0	0
Office | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	1,335	0
Recorded Investment	1,335	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	1,325	256
Interest Income Recognized	0	0
Office | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	0	745
Interest Income Recognized	0	0
Other | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	0	60
Interest Income Recognized	0	0
Other | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	0	235
Interest Income Recognized	0	0
Residential real estate
Loans individually evaluated for impairment by class of loans
Restructured loans	1,666
Residential real estate | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Residential real estate | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	17,725	16,257
Recorded Investment	15,803	14,353
Partial Charge-offs	1,922	1,904
Allowance for Loan Losses Allocated	2,192	2,163
Average Recorded Investment	15,801	13,412
Interest Income Recognized	1	0
Construction real estate | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Construction real estate | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Indirect vehicle
Loans individually evaluated for impairment by class of loans
Restructured loans	20
Indirect vehicle | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	207	223
Recorded Investment	108	122
Partial Charge-offs	99	101
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	258	252
Interest Income Recognized	5	0
Indirect vehicle | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Home equity
Loans individually evaluated for impairment by class of loans
Restructured loans	33
Home equity | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	592	0
Recorded Investment	592	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	592	143
Interest Income Recognized	0	0
Home equity | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	30,192	31,104
Recorded Investment	27,845	28,790
Partial Charge-offs	2,347	2,314
Allowance for Loan Losses Allocated	2,634	2,930
Average Recorded Investment	27,847	28,677
Interest Income Recognized	11	0
Other consumer | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Other consumer | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0
Recorded Investment	0	0
Partial Charge-offs	0	0
Allowance for Loan Losses Allocated	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Performing
Loans individually evaluated for impairment by class of loans
Restructured loans	31,101	32,687
Non-performing
Loans individually evaluated for impairment by class of loans
Restructured loans	$ 20,694	$ 27,068

Loans (Details 6)

Loans (Details 6)	3 Months Ended
	Mar. 31, 2017USD ($)loan	Mar. 31, 2016USD ($)loan
Restructured loans
Redefaulted loans	$ 0
Period past due of recorded redefaulted loans (in days)	90 days
Performing
Restructured loans
Number of Loans | loan	4	2
Pre-Modification Recorded Investment	$ 442,000	$ 410,000
Post-Modification Recorded Investment	442,000	410,000
Charge-offs and Specific Reserves	$ 52,000	$ 0
Performing | Residential real estate
Restructured loans
Number of Loans | loan	3
Pre-Modification Recorded Investment	$ 409,000
Post-Modification Recorded Investment	409,000
Charge-offs and Specific Reserves	$ 49,000
Performing | Home equity
Restructured loans
Number of Loans | loan	1	2
Pre-Modification Recorded Investment	$ 33,000	$ 410,000
Post-Modification Recorded Investment	33,000	410,000
Charge-offs and Specific Reserves	$ 3,000	$ 0
Non-performing
Restructured loans
Number of Loans | loan	12	20
Pre-Modification Recorded Investment	$ 1,277,000	$ 1,233,000
Post-Modification Recorded Investment	1,277,000	1,233,000
Charge-offs and Specific Reserves	$ 158,000	$ 73,000
Non-performing | Residential real estate
Restructured loans
Number of Loans | loan	9	1
Pre-Modification Recorded Investment	$ 1,257,000	$ 72,000
Post-Modification Recorded Investment	1,257,000	72,000
Charge-offs and Specific Reserves	$ 154,000	$ 0
Non-performing | Indirect vehicle
Restructured loans
Number of Loans | loan	3	10
Pre-Modification Recorded Investment	$ 20,000	$ 80,000
Post-Modification Recorded Investment	20,000	80,000
Charge-offs and Specific Reserves	$ 4,000	$ 22,000
Non-performing | Home equity
Restructured loans
Number of Loans | loan		9
Pre-Modification Recorded Investment		$ 1,081,000
Post-Modification Recorded Investment		1,081,000
Charge-offs and Specific Reserves		$ 51,000

Loans (Details 7)

Loans (Details 7) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)
Financing Receivable, Modifications, Post Modification Recorded Investment [Roll Forward]
Ending balance	$ 1,719
Performing
Financing Receivable, Modifications, Post Modification Recorded Investment [Roll Forward]
Beginning balance	32,687
Additions	442
Charge-offs	0
Principal payments, net	(386)
Removals	(2,334)
Transfers in	713
Transfers out	(21)
Ending balance	31,101
Non-performing
Financing Receivable, Modifications, Post Modification Recorded Investment [Roll Forward]
Beginning balance	27,068
Additions	1,277
Charge-offs	(238)
Principal payments, net	(4,734)
Removals	(1,987)
Transfers in	21
Transfers out	(713)
Ending balance	$ 20,694

Loans (Details 8)

Loans (Details 8) $ in Thousands	Mar. 31, 2017USD ($)
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Extended Maturity and Amortization and Reduction of Interest Rate	$ 455
Extended Maturity and/or Amortization	822
Delay in Payments or Reduction of Interest Rate	442
Total	1,719
Residential real estate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Extended Maturity and Amortization and Reduction of Interest Rate	455
Extended Maturity and/or Amortization	822
Delay in Payments or Reduction of Interest Rate	389
Total	1,666
Indirect vehicle
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Extended Maturity and Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	0
Delay in Payments or Reduction of Interest Rate	20
Total	20
Home equity
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Extended Maturity and Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	0
Delay in Payments or Reduction of Interest Rate	33
Total	$ 33

Loans (Details 9)

Loans (Details 9) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Allowance for credit losses [Roll Forward]
Beginning balance		$ 139,366
Ending balance		144,170
Ending allowance balance attributable to loans:
Acquired and accounted for under ASC 310-30	[1]	329	$ 1,590
Unfunded Commitments
Allowance for unfunded credit commitments, beginning balance		2,476	3,368
Allowance for unfunded commitments, Provision		(148)	(129)
Individually evaluated for impairment for unfunded commitments		541	1,205
Unfunded commitments collectively evaluated for impairment		1,787	2,034
Allowance for unfunded credit commitments, ending balance		2,328	3,239
Allowance for credit losses
Allowance for credit losses, beginning balance		141,842	131,508
Allowance for loan losses and unfunded commitments charge offs		3,373	3,588
Allowance for loan losses and unfunded commitments recoveries		4,295	2,249
Allowance for loan losses and unfunded commitments provision		3,734	7,563
Allowance for credit losses, individually evaluated for impairment		6,639	27,886
Allowance for credit losses, collectively evaluated for impairment		139,530	108,256
Acquired and accounted for under ASC 310-30	[1]	329	1,590
Allowance for credit losses, ending balance		146,498	137,732
Loans:
Individually evaluated for impairment		70,451	108,952
Collectively evaluated for impairment		12,719,216	9,711,951
Acquired and accounted for under ASC 310-30	[1]	168,814	140,445
Total loans		12,958,481	9,961,348	$ 12,768,803
Commercial loans
Allowance for credit losses [Roll Forward]
Beginning balance		44,661	39,316
Charge-offs		168	713
Recoveries		1,510	380
Provision		(5,313)	7,979
Ending balance		40,690	46,962
Ending allowance balance attributable to loans:
Individually evaluated for impairment		986	12,174
Collectively evaluated for impairment		39,545	34,282
Acquired and accounted for under ASC 310-30	[1]	159	506
Allowance for credit losses
Acquired and accounted for under ASC 310-30	[1]	159	506
Loans:
Individually evaluated for impairment		15,214	31,869
Collectively evaluated for impairment		4,348,908	3,477,735
Acquired and accounted for under ASC 310-30	[1]	24,768	25,924
Total loans		4,388,890	3,535,528
Commercial loans collateralized by assignment of lease payments
Allowance for credit losses [Roll Forward]
Beginning balance		12,238	10,434
Charge-offs		0	574
Recoveries		463	50
Provision		(558)	595
Ending balance		12,143	10,505
Ending allowance balance attributable to loans:
Individually evaluated for impairment		0	2,299
Collectively evaluated for impairment		12,143	8,206
Loans:
Individually evaluated for impairment		729	5,554
Collectively evaluated for impairment		2,007,872	1,768,550
Total loans		2,008,601	1,774,104
Commercial real estate
Allowance for credit losses [Roll Forward]
Beginning balance		51,807	45,475
Charge-offs		1,085	352
Recoveries		518	594
Provision		6,980	1,068
Ending balance		58,220	46,785
Ending allowance balance attributable to loans:
Individually evaluated for impairment		286	6,522
Collectively evaluated for impairment		57,799	39,273
Acquired and accounted for under ASC 310-30	[1]	135	990
Allowance for credit losses
Acquired and accounted for under ASC 310-30	[1]	135	990
Loans:
Individually evaluated for impairment		10,160	29,100
Collectively evaluated for impairment		3,724,011	2,802,714
Acquired and accounted for under ASC 310-30	[1]	46,683	29,325
Total loans		3,780,854	2,861,139
Residential real estate
Allowance for credit losses [Roll Forward]
Beginning balance		5,971	5,734
Charge-offs		90	368
Recoveries		528	24
Provision		1,722	206
Ending balance		8,131	5,596
Ending allowance balance attributable to loans:
Individually evaluated for impairment		2,192	2,642
Collectively evaluated for impairment		5,939	2,954
Loans:
Individually evaluated for impairment		15,803	13,047
Collectively evaluated for impairment		1,211,415	664,744
Acquired and accounted for under ASC 310-30	[1]	77,332	55,397
Total loans		1,304,550	733,188
Construction real estate
Allowance for credit losses [Roll Forward]
Beginning balance		14,758	15,113
Charge-offs		0
Recoveries		112	27
Provision		(11)	(526)
Ending balance		14,859	14,614
Ending allowance balance attributable to loans:
Collectively evaluated for impairment		14,824	14,520
Acquired and accounted for under ASC 310-30	[1]	35	94
Allowance for credit losses
Acquired and accounted for under ASC 310-30	[1]	35	94
Loans:
Collectively evaluated for impairment		554,942	310,278
Acquired and accounted for under ASC 310-30	[1]	5,624	13,859
Total loans		560,566	324,137
Indirect vehicle
Allowance for credit losses [Roll Forward]
Beginning balance		3,421	2,418
Charge-offs		1,411	931
Recoveries		652	463
Provision		962	782
Ending balance		3,624	2,732
Ending allowance balance attributable to loans:
Individually evaluated for impairment			0
Collectively evaluated for impairment		3,624	2,732
Loans:
Individually evaluated for impairment		108	122
Collectively evaluated for impairment		573,684	432,793
Total loans		573,792	432,915
Home equity
Allowance for credit losses [Roll Forward]
Beginning balance		5,469	7,374
Charge-offs		173	238
Recoveries		283	318
Provision		(267)	(2,432)
Ending balance		5,312	5,022
Ending allowance balance attributable to loans:
Individually evaluated for impairment		2,634	3,044
Collectively evaluated for impairment		2,678	1,978
Loans:
Individually evaluated for impairment		28,437	29,260
Collectively evaluated for impairment		218,368	177,819
Acquired and accounted for under ASC 310-30	[1]	12,382	13,353
Total loans		259,187	220,432
Other consumer
Allowance for credit losses [Roll Forward]
Beginning balance		1,041	2,276
Charge-offs		446	412
Recoveries		229	393
Provision		367	20
Ending balance		1,191	2,277
Ending allowance balance attributable to loans:
Collectively evaluated for impairment		1,191	2,277
Loans:
Individually evaluated for impairment		0
Collectively evaluated for impairment		80,016	77,318
Acquired and accounted for under ASC 310-30	[1]	2,025	2,587
Total loans		82,041	$ 79,905
Purchased loans
Allowance for credit losses [Roll Forward]
Provision		$ 182
[1]	Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 “Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality.”

Loans (Details 10)

Loans (Details 10) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Purchased loans
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Provision for credit losses	$ 182
Allowance for loan losses and unfunded commitments write offs net of recoveries	355
Commercial real estate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Provision for credit losses	6,980	$ 1,068
Allowance for loan losses and unfunded commitments acquired with deteriorated credit quality	$ 329		$ 866

Loans (Details 11)

Loans (Details 11) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Changes in the accretable yield for purchased credit-impaired loans
Balance at beginning of period		$ 16,050	$ 12,596
Purchases		43	0
Accretion		(2,188)	(2,210)
Other	[1]	1,006	3,584
Balance at end of period		$ 14,911	$ 13,970
[1]	Primarily includes discount transfers from non-accretable discount to accretable discount due to better than expected performance of loan pools acquired and accounted for under ASC 310-30.

Loans (Details 12)

Loans (Details 12) $ in Thousands	Mar. 31, 2017USD ($)
Loans
Non covered loans	$ 2,347,296
Total acquired	2,364,136
Purchased Credit-Impaired Loans
Loans
Non covered loans	83,216
Total acquired	100,056
Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	2,264,080
Total acquired	2,264,080
Commercial loans, commercial real estate receivable and construction loans | Heritage
Loans
Loans not covered under the loss share agreement	1,600
Commercial loans, commercial real estate receivable and construction loans | Benchmark
Loans
Loans not covered under the loss share agreement	1,600
Commercial loans, commercial real estate receivable and construction loans | Broadway and New Century
Loans
Loans not covered under the loss share agreement	5,600
Commercial loans
Loans
Non covered loans	689,426
Commercial loans | Purchased Credit-Impaired Loans
Loans
Non covered loans	24,768
Commercial loans | Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	664,658
Commercial loans collateralized by assignment of lease payments
Loans
Non covered loans	68,405
Commercial loans collateralized by assignment of lease payments | Purchased Credit-Impaired Loans
Loans
Non covered loans	0
Commercial loans collateralized by assignment of lease payments | Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	68,405
Commercial real estate
Loans
Non covered loans	1,221,276
Commercial real estate | Purchased Credit-Impaired Loans
Loans
Non covered loans	46,683
Commercial real estate | Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	1,174,593
Construction real estate
Loans
Non covered loans	21,406
Construction real estate | Purchased Credit-Impaired Loans
Loans
Non covered loans	5,624
Construction real estate | Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	15,782
Consumer related
Loans
Covered loans	16,840
Non covered loans	346,783
Consumer related | Purchased Credit-Impaired Loans
Loans
Covered loans	16,840
Non covered loans	6,141
Consumer related | Purchased Credit-Impaired Loans | Ginnie Mae
Loans
Consumer related purchased credit-impaired loans	68,800
Consumer related | Purchased Non-Credit-Impaired Loans
Loans
Covered loans	0
Non covered loans	$ 340,642

Goodwill and Intangibles (Detai

Goodwill and Intangibles (Details)	3 Months Ended
	Mar. 31, 2017USD ($)segment	Mar. 31, 2016USD ($)	Dec. 31, 2016USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Number of operating segments | segment	3
Impairment loss	$ 0	$ 0
Goodwill	$ 999,925,000		$ 1,001,038,000
Weighted average amortization period (in years)	13 years

Goodwill and Intangibles (Det62

Goodwill and Intangibles (Details 2) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 1,001,038
Goodwill from business combinations	(1,113)	[1]
Balance at end of period	999,925
Banking
Goodwill [Roll Forward]
Balance at beginning of period	960,398
Goodwill from business combinations	(1,113)	[1]
Balance at end of period	959,285
Leasing
Goodwill [Roll Forward]
Balance at beginning of period	40,640
Goodwill from business combinations	0	[1]
Balance at end of period	40,640
Mortgage Banking
Goodwill [Roll Forward]
Balance at beginning of period	0
Goodwill from business combinations	0	[1]
Balance at end of period	$ 0
[1]	Due to the adjustments recognized for the American Chartered merger.

Goodwill and Intangibles (Det63

Goodwill and Intangibles (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Changes in the carrying amount of core deposit and client relationship intangibles
Balance at beginning of period	$ 62,959
Amortization expense	(2,090)	$ (1,626)
Balance at end of period	60,869
Gross carrying amount	112,820
Accumulated amortization	$ (51,951)

Goodwill and Intangibles (Det64

Goodwill and Intangibles (Details 4) $ in Thousands	Mar. 31, 2017USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,017	$ 6,103
2,018	7,451
2,019	5,674
2,020	5,022
2,021	4,790
Thereafter	31,829
Total estimated future amortization expense	$ 60,869

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Banking and Thrift [Abstract]
Demand deposit accounts, noninterest bearing	$ 6,211,173	$ 6,408,169
NOW, money market and interest bearing deposits	4,580,773	4,543,004
Savings accounts	1,126,879	1,135,992
Certificates of deposit, $250,000 or more	1,179,607	1,144,121
Other certificates of deposit	900,951	879,162
Total deposits	13,999,383	14,110,448
Brokered deposits	$ 816,300	$ 795,000

Short-Term Borrowings (Details)

Short-Term Borrowings (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Short-term borrowings
Weighted Average Interest Rate	0.81%	0.59%
Amount	$ 1,550,628,000	$ 1,569,288,000
Customer repurchase agreements
Short-term borrowings
Weighted Average Interest Rate	0.21%	0.22%
Amount	$ 182,128,000	$ 237,538,000
Federal Home Loan Bank advances
Short-term borrowings
Weighted Average Interest Rate	0.89%	0.63%
Amount	$ 1,300,000,000	$ 1,275,000,000
Federal funds purchased
Short-term borrowings
Weighted Average Interest Rate	1.01%	0.80%
Amount	$ 68,500,000	$ 46,750,000
Line of credit
Short-term borrowings
Weighted Average Interest Rate	0.00%	2.52%
Amount	$ 0	$ 10,000,000

Short-Term Borrowings (Details

Short-Term Borrowings (Details 2) - USD ($)	Dec. 18, 2015	Mar. 31, 2017	Dec. 31, 2016
Short-term borrowings
Fixed interest rate Federal Home Loan Bank advances		$ 1,300,000,000	$ 1,300,000,000
Short-term borrowings		1,550,628,000	1,569,288,000
Federal Home Loan Bank advances
Short-term borrowings
Short-term borrowings		1,300,000,000	1,275,000,000
Line of credit
Short-term borrowings
Line of credit facility, maximum borrowing capacity	$ 35,000,000
Description of annual interest rate basis	one month LIBOR
Short-term borrowings		$ 0	$ 10,000,000
Line of credit | LIBOR
Short-term borrowings
Basis spread on variable rate	1.75%
Minimum | Federal Home Loan Bank advances
Short-term borrowings
Effective interest rate of amounts due within one year		0.60%
Maximum | Federal Home Loan Bank advances
Short-term borrowings
Effective interest rate of amounts due within one year		0.94%

Long-Term Borrowings (Details)

Long-Term Borrowings (Details) - USD ($) $ in Thousands	Aug. 24, 2016	Mar. 31, 2017	Dec. 31, 2016
Long-term borrowings
Federal Home Loan Bank advances		$ 230,800	$ 230,900
Long-term borrowings		$ 315,618	$ 311,790
Weighted average interest rate		1.99%	1.64%
London Interbank Offered Rate (LIBOR)
Long-term borrowings
Basis spread on variable rate	1.75%
Federal Home Loan Bank advances
Long-term borrowings
Long-term borrowings		$ 230,819	$ 230,865
Weighted average interest rate		1.27%	0.85%
Notes payable to banks
Long-term borrowings
Long-term borrowings		$ 71,799	$ 66,925
Weighted average interest rate		4.18%	4.18%
Equipment pledged as collateral		$ 80,400	$ 79,600
Unsecured term
Long-term borrowings
Long-term borrowings	$ 16,000	$ 13,000	$ 14,000
Weighted average interest rate		2.73%	2.52%
Quarterly principal payments	$ 1,000
Minimum | Federal Home Loan Bank advances
Long-term borrowings
Interest rate		1.06%
Minimum | Notes payable to banks
Long-term borrowings
Interest rate		2.25%
Maximum | Federal Home Loan Bank advances
Long-term borrowings
Interest rate		5.87%
Maximum | Notes payable to banks
Long-term borrowings
Interest rate		7.40%

Junior Subordinated Notes Iss69

Junior Subordinated Notes Issued to Capital Trusts (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Dec. 31, 2016
Junior Subordinated Notes
Principal balance		$ 210,769	$ 210,668
Junior Subordinated Notes | Maximum
Investment Owned, Balance [Abstract]
Period for deferment of payment of interest on notes (in years)		5 years
Coal City Capital Trust I | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.80%
Description of annual interest rate basis		3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value		$ 25,000
Coal City Capital Trust I | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance		$ 25,774
Basis spread on variable rate		1.80%
Description of annual interest rate basis		3-mo LIBOR
MB Financial Capital Trust II | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.40%
Description of annual interest rate basis		3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value		$ 35,000
MB Financial Capital Trust II | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance		$ 36,083
Basis spread on variable rate		1.40%
Description of annual interest rate basis		3-mo LIBOR
MB Financial Capital Trust III | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.50%
Description of annual interest rate basis		3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value		$ 10,000
MB Financial Capital Trust III | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance		$ 10,310
Basis spread on variable rate		1.50%
Description of annual interest rate basis		3-mo LIBOR
MB Financial Capital Trust IV | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.52%
Description of annual interest rate basis		3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value		$ 20,000
MB Financial Capital Trust IV | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance		$ 20,619
Basis spread on variable rate		1.52%
Description of annual interest rate basis		3-mo LIBOR
MB Financial Capital Trust V | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.30%
Description of annual interest rate basis		3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value		$ 30,000
MB Financial Capital Trust V | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance		$ 30,928
Basis spread on variable rate		1.30%
Description of annual interest rate basis		3-mo LIBOR
MB Financial Capital Trust VI | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.30%
Description of annual interest rate basis		3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value		$ 22,500
MB Financial Capital Trust VI | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance		$ 23,196
Basis spread on variable rate		1.30%
Description of annual interest rate basis		3-mo LIBOR
FOBB Statutory Trust III | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate	[1]	2.80%
Description of annual interest rate basis	[1]	3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value	[1]	$ 5,000
FOBB Statutory Trust III | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance	[1]	$ 5,155
Basis spread on variable rate	[1]	2.80%
Description of annual interest rate basis	[1]	3-mo LIBOR
TAYC Capital Trust II
Investment Owned, Balance [Abstract]
Purchase accounting adjustments discount		$ 6,700
TAYC Capital Trust II | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate	[2]	2.68%
Description of annual interest rate basis	[2]	3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value	[2]	$ 40,000
TAYC Capital Trust II | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance	[2]	$ 41,238
Basis spread on variable rate	[2]	2.68%
Description of annual interest rate basis	[2]	3-mo LIBOR
American Chartered Statutory Trust I | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate	[3]	3.60%
Description of annual interest rate basis	[3]	3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value	[3]	$ 20,000
American Chartered Statutory Trust I | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance	[3]	$ 20,619
Basis spread on variable rate	[3]	3.60%
Description of annual interest rate basis	[3]	3-mo LIBOR
American Chartered Statutory Trust II | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate	[3]	2.75%
Description of annual interest rate basis	[3]	3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value	[3]	$ 10,000
American Chartered Statutory Trust II | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance	[3]	$ 10,310
Basis spread on variable rate	[3]	2.75%
Description of annual interest rate basis	[3]	3-mo LIBOR
American Chartered Statutory Trust I and II
Investment Owned, Balance [Abstract]
Purchase accounting adjustments discount		$ 6,200
[1]	FOBB Statutory Trust III was established by First Oak Brook Bancshares, Inc. (“FOBB”) prior to the Company's acquisition of FOBB in 2006, and the junior subordinated notes issued by FOBB to FOBB Statutory Trust III were assumed by the Company upon completion of the acquisition.
[2]	TAYC Capital Trust II was established by Taylor Capital Group, Inc. (“Taylor Capital”) prior to the Company's acquisition of Taylor Capital in 2014, and the junior subordinated notes issued by Taylor Capital to TAYC Capital Trust II were assumed by the Company upon completion of the acquisition. Principal balance and face value amounts associated with TAYC Capital Trust II do not include purchase accounting adjustments to such amounts, which in each case resulted in a discount of $6.7 million.
[3]	American Chartered Statutory Trust I and American Chartered Statutory Trust II were established by American Chartered prior to the Company's acquisition of American Chartered in August 2016, and the junior subordinated notes issued by American Chartered to American Chartered Statutory Trust I and American Chartered Statutory Trust II were assumed by the Company upon completion of the acquisition. Principal balance and face value amounts associated with American Chartered Statutory Trust I and American Chartered Statutory Trust II do not include purchase accounting adjustments to such amounts, which in each case resulted in a discount of $6.2 million.

Commitments and Contingencies70

Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Commitments [Abstract]
Maximum maturity period for letters of credit (in years)	5 years
Increase (decrease) in maximum potential amount of future payments under letters of credit	$ (2,600)
Dollar amount of letters of credit outstanding	184,500	$ 187,200
Letters of credit issued or renewed	9,900
Capital expenditure commitments outstanding	3,700
Home equity lines
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	244,136	235,279
Other commitments
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	3,724,089	3,679,259
Standby
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	181,783	185,386
Commercial
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	$ 2,765	$ 1,766

Commitments and Contingencies71

Commitments and Contingencies (Details 2)	3 Months Ended
	Mar. 31, 2017
States and political subdivisions | State of Illinois
Concentrations of credit risk
Percentage of investments issued by states and political subdivisions that were within the state of Illinois	21.00%

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($)		Mar. 31, 2017	Dec. 31, 2016
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		$ 1,657,950,000	$ 1,696,195,000
Loans held for sale		493,261,000	716,883,000
Loans		12,789,667,000	12,605,726,000
Mortgage servicing rights		251,498,000	238,011,000
Derivative financial instruments		15,776,000	22,833,000
Derivative financial instruments		40,588,000	53,497,000
U.S. Government sponsored agencies and enterprises
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		23,330,000	23,415,000
States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		389,109,000	391,365,000
Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		966,375,000	983,684,000
Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		90,154,000	93,008,000
Corporate bonds
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		178,097,000	193,895,000
Equity securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		10,885,000	10,828,000
Recurring basis
Financial assets and financial liabilities measured at fair value on a recurring basis
Loans held for sale		493,261,000	716,883,000
Loans		16,029,000	16,273,000
Assets held in trust for deferred compensation		21,231,000	18,723,000
Other liabilities	[1]	21,231,000	18,723,000
Derivative financial instruments		49,895,000	63,885,000
Recurring basis | U.S. Government sponsored agencies and enterprises
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		23,330,000	23,415,000
Recurring basis | States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		389,109,000	391,365,000
Recurring basis | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		966,375,000	983,684,000
Recurring basis | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Mortgage servicing rights		251,498,000	238,011,000
Recurring basis | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative financial instruments		37,942,000	44,586,000
Recurring basis | Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		90,154,000	93,008,000
Recurring basis | Corporate bonds
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		178,097,000	193,895,000
Recurring basis | Equity securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		10,885,000	10,828,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		10,885,000	10,828,000
Loans held for sale		0	0
Assets held in trust for deferred compensation		21,231,000	18,723,000
Derivative financial instruments		858,000	7,687,000
Other liabilities	[1]	21,231,000	18,723,000
Derivative financial instruments		3,370,000	2,046,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative financial instruments		858,000	7,687,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		10,885,000	10,828,000
Recurring basis | Significant Other Observable Inputs (Level 2)
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		1,646,556,000	1,684,823,000
Loans held for sale		493,261,000	716,883,000
Loans		16,029,000	16,273,000
Derivative financial instruments		31,473,000	33,739,000
Derivative financial instruments		46,525,000	61,839,000
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. Government sponsored agencies and enterprises
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		23,330,000	23,415,000
Recurring basis | Significant Other Observable Inputs (Level 2) | States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		388,736,000	390,992,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		966,239,000	983,513,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative financial instruments		31,473,000	33,739,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		90,154,000	93,008,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate bonds
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		178,097,000	193,895,000
Recurring basis | Significant Unobservable Inputs (Level 3)
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		509,000	544,000
Loans held for sale		0	0
Derivative financial instruments		5,611,000	3,160,000
Derivative financial instruments		0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		373,000	373,000
Recurring basis | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		136,000	171,000
Recurring basis | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Mortgage servicing rights		251,498,000	238,011,000
Recurring basis | Significant Unobservable Inputs (Level 3) | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative financial instruments		$ 5,611,000	$ 3,160,000
[1]	Liabilities associated with assets held in trust for deferred compensation

Fair Value Measurements (Deta73

Fair Value Measurements (Details 2) - USD ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale	$ 1,657,950,000	$ 1,696,195,000
Mortgage servicing rights	251,498,000	238,011,000
Derivative financial instruments	15,776,000	22,833,000
States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale	389,109,000	391,365,000
Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale	966,375,000	983,684,000
Recurring basis | States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale	389,109,000	391,365,000
Recurring basis | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale	966,375,000	983,684,000
Recurring basis | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Mortgage servicing rights	251,498,000	238,011,000
Recurring basis | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative financial instruments	37,942,000	44,586,000
Significant Unobservable Inputs (Level 3) | Recurring basis
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale	509,000	544,000
Derivative financial instruments	5,611,000	3,160,000
Significant Unobservable Inputs (Level 3) | Recurring basis | States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale	$ 373,000	373,000
Credit assumption (as a percent)	50.00%
Significant Unobservable Inputs (Level 3) | Recurring basis | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale	$ 136,000	171,000
Significant Unobservable Inputs (Level 3) | Recurring basis | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Mortgage servicing rights	251,498,000	238,011,000
Significant Unobservable Inputs (Level 3) | Recurring basis | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative financial instruments	$ 5,611,000	$ 3,160,000
Significant Unobservable Inputs (Level 3) | Recurring basis | Minimum | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Constant prepayment rates (as a percent)	1.00%
Significant Unobservable Inputs (Level 3) | Recurring basis | Minimum | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Constant prepayment rates (as a percent)	6.50%
Discount rate	9.53%
Maturity (months)	323 months
Delinquencies	0.35%
Costs to service	$ 66
Additive delinquent costs to service	$ 175
Significant Unobservable Inputs (Level 3) | Recurring basis | Minimum | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Expected closing ratio	70.00%
Expected delivery price	0.9877%
Significant Unobservable Inputs (Level 3) | Recurring basis | Maximum | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Constant prepayment rates (as a percent)	3.00%
Significant Unobservable Inputs (Level 3) | Recurring basis | Maximum | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Constant prepayment rates (as a percent)	7.90%
Discount rate	11.04%
Maturity (months)	357 months
Delinquencies	1.96%
Costs to service	$ 226
Additive delinquent costs to service	$ 1,000
Significant Unobservable Inputs (Level 3) | Recurring basis | Maximum | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Expected closing ratio	95.00%
Expected delivery price	1.0832%

Fair Value Measurements (Deta74

Fair Value Measurements (Details 3) - Mortgage servicing rights	3 Months Ended
	Mar. 31, 2017USD ($)
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Impact on fair value of 10% adverse change, CPR	$ (7,847,000)
Impact on fair value of 20% adverse change, CPR	(15,282,000)
Impact on fair value of 10% adverse change, discount rate	(10,799,000)
Impact on fair value of 20% adverse change, discount rate	(20,750,000)
Impact on fair value of 10% adverse change, delinquency rate	(2,466,000)
Impact on fair value of 20% adverse change, delinquency rate	(4,353,000)
Impact on fair value of 10% adverse change, costs to service	(4,719,000)
Impact on fair value of 20% adverse change, costs to service	$ (9,438,000)
Weighted average
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Weighted average CPR	7.20%
Weighted average discount rate	9.80%
Weighted average delinquency rate	1.81%
Weighted average costs to service	$ 89

Fair Value Measurements (Deta75

Fair Value Measurements (Details 4) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Financial assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Fair value assumption, allowance for impaired real estate loans percentage	100.00%
Investment Securities
Financial assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance, beginning of period	$ 544	$ 773
Purchases	0	0
Originations	0	0
Included in earnings	0	0
Principal payments	(35)	(83)
Sales	0	0
Balance, ending of period	509	690
Mortgage Servicing Rights
Financial assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance, beginning of period	238,011	168,162
Purchases	496	154
Originations	15,651	11,856
Included in earnings	(2,660)	(34,372)
Principal payments	0	0
Sales	0	0
Balance, ending of period	251,498	145,800
Derivatives
Financial assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance, beginning of period	3,160	3,822
Purchases	0	0
Originations	0	0
Included in earnings	2,451	4,397
Principal payments	0	0
Sales	0	0
Balance, ending of period	$ 5,611	$ 8,219

Fair Value Measurements (Deta76

Fair Value Measurements (Details 5) - Nonrecurring basis - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financial Assets:
Impaired loans	$ 51,274	$ 54,576
Foreclosed assets	19,047	31,607
Significant Unobservable Inputs (Level 3)
Financial Assets:
Impaired loans	51,274	54,576
Foreclosed assets	$ 19,047	$ 31,607
Significant Unobservable Inputs (Level 3) | Minimum
Financial Assets:
Appraisal adjustment impaired loans (as a percent)	5.00%
Appraisal adjustment foreclosed assets (as a percent)	5.00%
Significant Unobservable Inputs (Level 3) | Maximum
Financial Assets:
Appraisal adjustment impaired loans (as a percent)	10.00%
Appraisal adjustment foreclosed assets (as a percent)	10.00%

Fair Value Measurements (Deta77

Fair Value Measurements (Details 6) - USD ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Maximum maturity period of short-term borrowings where carrying value approximates fair value (in days)	90 days
Minimum maturity period of short-term borrowings where fair value is based on discounted value of contractual cash flows (in days)	90 days
Financial Assets:
Cash and due from banks	$ 368,078,000	$ 364,783,000
Interest earning deposits with banks	102,328,000	98,686,000
Investment securities available for sale	1,657,950,000	1,696,195,000
Investment securities held to maturity	1,083,998,000	1,093,740,000
Non-marketable securities - FHLB and FRB stock	144,427,000	143,276,000
Loans held for sale	493,261,000	716,883,000
Derivative financial instruments	15,776,000	22,833,000
Financial Liabilities:
Non-interest bearing deposits	6,211,173,000	6,408,169,000
Interest bearing deposits	7,788,210,000	7,702,279,000
Short-term borrowings	1,550,628,000	1,569,288,000
Junior subordinated notes issued to capital trusts	210,769,000	210,668,000
Derivative financial instruments	40,588,000	53,497,000
Carrying Amount
Financial Assets:
Cash and due from banks	368,078,000	364,783,000
Interest earning deposits with banks	102,328,000	98,686,000
Investment securities available for sale	1,657,950,000	1,696,195,000
Investment securities held to maturity	1,056,008,000	1,069,750,000
Non-marketable securities - FHLB and FRB stock	144,427,000	143,276,000
Loans held for sale	493,261,000	716,883,000
Loans, net	12,814,311,000	12,629,437,000
Accrued interest receivable	58,348,000	59,024,000
Derivative financial instruments	37,942,000	44,586,000
Financial Liabilities:
Non-interest bearing deposits	6,211,173,000	6,408,169,000
Interest bearing deposits	7,788,210,000	7,702,279,000
Short-term borrowings	1,550,628,000	1,569,288,000
Long-term borrowings	315,618,000	311,790,000
Junior subordinated notes issued to capital trusts	210,769,000	210,668,000
Accrued interest payable	4,469,000	4,288,000
Derivative financial instruments	49,895,000	63,885,000
Estimated Fair Value
Financial Assets:
Cash and due from banks	368,078,000	364,783,000
Interest earning deposits with banks	102,328,000	98,686,000
Investment securities available for sale	1,657,950,000	1,696,195,000
Investment securities held to maturity	1,083,998,000	1,093,740,000
Non-marketable securities - FHLB and FRB stock	144,427,000	143,276,000
Loans held for sale	493,261,000	716,883,000
Loans, net	12,913,824,000	12,747,107,000
Accrued interest receivable	58,348,000	59,024,000
Derivative financial instruments	37,942,000	44,586,000
Financial Liabilities:
Non-interest bearing deposits	6,211,173,000	6,408,169,000
Interest bearing deposits	7,782,914,000	7,698,839,000
Short-term borrowings	1,550,730,000	1,569,314,000
Long-term borrowings	320,655,000	317,028,000
Junior subordinated notes issued to capital trusts	165,889,000	157,098,000
Accrued interest payable	4,469,000	4,288,000
Derivative financial instruments	49,895,000	63,885,000
Recurring basis
Financial Assets:
Loans held for sale	493,261,000	716,883,000
Financial Liabilities:
Derivative financial instruments	49,895,000	63,885,000
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets:
Cash and due from banks	368,078,000	364,783,000
Interest earning deposits with banks	102,328,000	98,686,000
Investment securities available for sale	10,885,000	10,828,000
Investment securities held to maturity	0	0
Non-marketable securities - FHLB and FRB stock	0	0
Loans held for sale	0	0
Loans, net	0	0
Accrued interest receivable	58,348,000	59,024,000
Derivative financial instruments	858,000	7,687,000
Financial Liabilities:
Non-interest bearing deposits	6,211,173,000	6,408,169,000
Interest bearing deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Junior subordinated notes issued to capital trusts	0	0
Accrued interest payable	4,469,000	4,288,000
Derivative financial instruments	3,370,000	2,046,000
Recurring basis | Significant Other Observable Inputs (Level 2)
Financial Assets:
Cash and due from banks	0	0
Interest earning deposits with banks	0	0
Investment securities available for sale	1,646,556,000	1,684,823,000
Investment securities held to maturity	1,083,998,000	1,093,740,000
Non-marketable securities - FHLB and FRB stock	0	0
Loans held for sale	493,261,000	716,883,000
Loans, net	16,029,000	16,273,000
Accrued interest receivable	0	0
Derivative financial instruments	31,473,000	33,739,000
Financial Liabilities:
Non-interest bearing deposits	0	0
Interest bearing deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Junior subordinated notes issued to capital trusts	0	0
Accrued interest payable	0	0
Derivative financial instruments	46,525,000	61,839,000
Recurring basis | Significant Unobservable Inputs (Level 3)
Financial Assets:
Cash and due from banks	0	0
Interest earning deposits with banks	0	0
Investment securities available for sale	509,000	544,000
Investment securities held to maturity	0	0
Non-marketable securities - FHLB and FRB stock	144,427,000	143,276,000
Loans held for sale	0	0
Loans, net	12,897,795,000	12,730,834,000
Accrued interest receivable	0	0
Derivative financial instruments	5,611,000	3,160,000
Financial Liabilities:
Non-interest bearing deposits	0	0
Interest bearing deposits	7,782,914,000	7,698,839,000
Short-term borrowings	1,550,730,000	1,569,314,000
Long-term borrowings	320,655,000	317,028,000
Junior subordinated notes issued to capital trusts	165,889,000	157,098,000
Accrued interest payable	0	0
Derivative financial instruments	$ 0	$ 0

Stock Incentive Plans (Details)

Stock Incentive Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Impact of the share-based payment plans in the financial statements
Total compensation expense for share-based payment plans during the period	$ 4,481	$ 4,051
Amount of related income tax benefit recognized in income	$ 4,422	$ 1,583
Stock options
Number of Options
Outstanding, beginning balance (in shares)	1,940,405
Granted (in shares)	155,059
Exercised (in shares)	(150,829)
Expired (in shares)	0
Forfeited or cancelled (in shares)	(6,518)
Outstanding, ending balance (in shares)	1,938,117		1,940,405
Options exercisable (in shares)	1,281,740
Weighted Average Exercise Price
Outstanding, beginning balance (in dollars per share)	$ 27.45
Granted (in dollars per share)	45.59
Exercised (in dollars per share)	26.83
Expired (in dollars per share)	0
Forfeited or cancelled (in dollars per share)	30.05
Outstanding, ending balance (in dollars per share)	28.94		$ 27.45
Options exercisable (in dollars per share)	$ 26.95
Weighted Average Remaining Contractual Term (In Years)
Outstanding, balance (in years)	5 years 7 months 3 days		5 years 3 months 23 days
Options exercisable (in years)	4 years 1 month 2 days
Aggregate Intrinsic Value (in thousands)
Options outstanding	$ 27,368
Options exercisable	$ 20,378
Fair value assumptions
Risk-free interest rate	2.19%
Expected volatility of Company’s stock	22.65%
Expected dividend yield	1.66%
Expected life of options	5 years 11 months
Weighted average fair value per option of options granted during the year (in dollars per share)	$ 9.49
Restricted shares
Number of Shares and Units
Shares and units outstanding, beginning balance (in shares)	998,807
Granted (in shares)	371,856
Vested (in shares)	(327,008)
Forfeited or cancelled (in shares)	(7,739)
Shares and units outstanding, ending balance (in shares)	1,035,916		998,807
Weighted Average Grant Date Fair Value
Shares Outstanding, Beginning balance (in dollars per share)	$ 31.20
Granted (in dollars per share)	45.85
Vested (in dollars per share)	31.09
Forfeited or cancelled (in dollars per share)	29.92
Shares Outstanding, Ending balance (in dollars per share)	$ 36.50		$ 31.20

Stock Incentive Plans (Details

Stock Incentive Plans (Details 2) - USD ($) $ in Thousands	Aug. 18, 2014	May 28, 2014	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock-based compensation
Grants beyond threshold limit count numerator (in shares)			2
Omnibus Incentive Plan
Stock-based compensation
Additional number of share authorized (in shares)		3,100,000
Total number of shares authorized (in shares)		11,400,000
Percentage of shares authorized for issuance		10.00%
Vesting period		3 years
Shares available for future grant (in shares)			2,913,676
Unrecognized compensation cost related to nonvested share-based compensation			$ 35,100
Period for recognition			3 years
Omnibus Incentive Plan | Taylor Capital Group, Inc.
Stock-based compensation
Total number of shares authorized (in shares)	13,800,000
Increase in amount of shares authorized (in shares)	2,400,000
Stock options
Stock-based compensation
Award requisite service period			4 years
Expiration term of options			10 years
Intrinsic value of options exercised			$ 2,900	$ 170
Stock options | Director
Stock-based compensation
Vesting period			5 years
Maximum percentage of directors fees with option to be received in equity based incentive awards			70.00%
Period of restriction for sale of shares vested			6 months
Restricted shares
Stock-based compensation
Intrinsic value of restricted shares that vested			$ 15,300	$ 6,000
Restricted shares | Minimum
Stock-based compensation
Vesting period			2 years
Restricted shares | Maximum
Stock-based compensation
Vesting period			4 years
Restricted stock | Director
Stock-based compensation
Vesting period			1 year
Maximum percentage of directors fees with option to be received in equity based incentive awards			100.00%
Performance-based restricted stock units
Stock-based compensation
Vesting period			3 years
Restricted stock issued (in shares)			65,476		80,780	71,560	48,569
Percentage of shares earned to number of units issued			121.00%
Performance based restricted units performance period			3 years
Share based compensation restricted stock units multiplier			100.00%
Performance-based restricted stock units | Minimum
Stock-based compensation
Percentage of shares earned to number of units issued			0.00%
Performance-based restricted stock units | Maximum
Stock-based compensation
Percentage of shares earned to number of units issued			175.00%

Derivative Financial Instrume80

Derivative Financial Instruments (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Derivative [Line Items]
Net amount payable under interest rate swap		$ 2		$ 1
Interest rate swap credit risk exposure		10,000
Asset Derivatives, Notional Amount		2,915,287		3,097,336
Asset Derivatives, Estimated Fair Value		37,942		44,586
Liability Derivatives, Notional Amount		3,469,720		3,467,875
Liability Derivatives, Estimated Fair Value		(49,895)		(63,885)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		(7,550)	$ 26,517
Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	2,915,287		3,097,336
Asset Derivatives, Estimated Fair Value	[1]	37,942		44,586
Liability Derivatives, Notional Amount	[1]	3,469,625		3,467,768
Liability Derivatives, Estimated Fair Value	[1]	(49,892)		(63,881)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		(7,551)	26,516
Commercial loan interest rate swaps
Derivative [Line Items]
Liability Derivatives, Notional Amount		95
Interest rate swap contracts | Derivative instruments designated as hedges of fair value
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	0		0
Asset Derivatives, Estimated Fair Value	[2]	0		0
Liability Derivatives, Notional Amount	[2]	95		107
Liability Derivatives, Estimated Fair Value	[2]	(3)		(4)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		1	1
Interest rate swap contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	1,353,075		1,310,057
Asset Derivatives, Estimated Fair Value	[1]	23,460		25,471
Liability Derivatives, Notional Amount	[1]	1,353,057		1,310,057
Liability Derivatives, Estimated Fair Value	[1]	(23,460)		(25,471)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		1,849	2,338
Interest rate swap contracts | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	516,000		383,000
Asset Derivatives, Estimated Fair Value	[1]	4,748		2,946
Liability Derivatives, Notional Amount	[1]	1,138,000		1,458,000
Liability Derivatives, Estimated Fair Value	[1]	(19,955)		(31,212)
Interest rate options contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	268,130		217,546
Asset Derivatives, Estimated Fair Value	[1]	1,207		881
Liability Derivatives, Notional Amount	[1]	268,130		217,546
Liability Derivatives, Estimated Fair Value	[1]	(1,207)		(881)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		0	36
Foreign exchange contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	40,176		40,641
Asset Derivatives, Estimated Fair Value	[1]	2,010		4,429
Liability Derivatives, Notional Amount	[1]	39,875		40,505
Liability Derivatives, Estimated Fair Value	[1]	(1,870)		(4,265)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		63	128
Spot foreign exchange contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	2,333		1,691
Asset Derivatives, Estimated Fair Value	[1]	48		12
Liability Derivatives, Notional Amount	[1]	563		660
Liability Derivatives, Estimated Fair Value	[1]	(30)		(5)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		678	303
Treasury futures contracts | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	37,500		15,500
Asset Derivatives, Estimated Fair Value	[1]	223		41
Liability Derivatives, Notional Amount	[1]	0		0
Liability Derivatives, Estimated Fair Value	[1]	0		0
TBA mortgage securities | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	83,000		0
Asset Derivatives, Estimated Fair Value	[1]	582		0
Liability Derivatives, Notional Amount	[1]	0		55,000
Liability Derivatives, Estimated Fair Value	[1]	0		(132)
Forward loan sale commitments | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	65,000		585,000
Asset Derivatives, Estimated Fair Value	[1]	53		7,646
Liability Derivatives, Notional Amount	[1]	670,000		386,000
Liability Derivatives, Estimated Fair Value	[1]	(3,370)		(1,915)
Interest rate lock commitments | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	550,073		543,901
Asset Derivatives, Estimated Fair Value	[1]	5,611		3,160
Liability Derivatives, Notional Amount	[1]	0		0
Liability Derivatives, Estimated Fair Value	[1]	0		$ 0
Mortgage related derivatives | Stand-alone derivative instruments
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		$ (10,141)	$ 23,711
[1]	These portfolio swaps are not designated as hedging instruments under ASC Topic 815.
[2]	Derivative instruments designated to hedge fixed-rate commercial real estate loans.

Derivative Financial Instrume81

Derivative Financial Instruments (Details 2) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	$ 15,776	$ 22,833
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	15,776	22,833
Financial Liabilities, Gross Amount Recognized	40,588	53,497
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	40,588	53,497
Repurchase Agreements, Financial Assets, Gross Amount Recognized	0	0
Repurchase Agreements, Financial Assets, Gross Amount Offset	0	0
Repurchase Agreements, Financial Assets, Net Amount Recognized	0	0
Repurchase Agreements, Financial Liabilities, Gross Amount Recognized	182,128	237,538
Repurchase Agreements, Financial Liabilities, Gross Amount Offset	0	0
Repurchase Agreements, Financial Liabilities, Net Amount Recognized	182,128	237,538
Total Financial Assets, Gross Amount Recognized	15,776	22,833
Total Financial Assets, Gross Amount Offset	0	0
Total Financial Assets, Net Amount Recognized	15,776	22,833
Total Financial Liabilities, Gross Amount Recognized	222,716	291,035
Total Financial Liabilities, Gross Amount Offset	0	0
Total Financial Liabilities, Net Amount Recognized	222,716	291,035
Interest rate swap contracts, caps and floors
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	8,509	7,885
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	8,509	7,885
Financial Liabilities, Gross Amount Recognized	16,255	18,564
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	16,255	18,564
Foreign exchange contracts
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	1,661	4,315
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	1,661	4,315
Financial Liabilities, Gross Amount Recognized	1,008	1,674
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	1,008	1,674
Mortgage related derivatives
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	5,606	10,633
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	5,606	10,633
Financial Liabilities, Gross Amount Recognized	23,325	33,259
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	$ 23,325	$ 33,259

Derivative Financial Instrume82

Derivative Financial Instruments (Details 3) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Financial Assets, Net Amount Recognized	$ 15,776	$ 22,833
Financial Assets, Financial Instruments	(15,674)	(18,382)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	102	4,451
Financial Liabilities, Net Amount Recognized	40,588	53,497
Financial Liabilities, Financial Instruments	(15,674)	(18,382)
Financial Liabilities, Collateral	(24,914)	(35,104)
Financial Liabilities, Net Amount	0	11
Repurchase Agreements, Financial Assets, Net Amount Recognized	0	0
Repurchase Agreements, Financial Assets, Financial Instruments	0	0
Repurchase Agreements, Financial Assets, Collateral	0	0
Repurchase Agreements, Financial Assets, Net Amount	0	0
Repurchase Agreements, Financial Liabilities, Net Amount Recognized	182,128	237,538
Repurchase Agreements, Financial Liabilities, Financial Instruments	0	0
Repurchase Agreements, Financial Liabilities, Collateral	(182,128)	(237,538)
Repurchase Agreements, Financial Liabilities, Net Amount	0	0
Total Financial Assets, Net Amount Recognized	15,776	22,833
Total Financial Assets, Financial Instruments	(15,674)	(18,382)
Total Financial Assets, Collateral	0	0
Total Financial Assets, Net Amount	102	4,451
Total Financial Liabilities, Net Amount Recognized	222,716	291,035
Total Financial Liabilities, Financial Instruments	(15,674)	(18,382)
Total Financial Liabilities, Collateral	(207,042)	(272,642)
Total Financial Liabilities, Net Amount	0	11
Counterparty A
Derivative [Line Items]
Financial Assets, Net Amount Recognized	4,647	2,697
Financial Assets, Financial Instruments	(4,647)	(2,697)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	0	0
Financial Liabilities, Net Amount Recognized	11,616	18,768
Financial Liabilities, Financial Instruments	(4,647)	(2,697)
Financial Liabilities, Collateral	(6,969)	(16,071)
Financial Liabilities, Net Amount	0	0
Counterparty B
Derivative [Line Items]
Financial Assets, Net Amount Recognized	5,567	4,683
Financial Assets, Financial Instruments	(5,567)	(4,683)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	0	0
Financial Liabilities, Net Amount Recognized	11,088	12,881
Financial Liabilities, Financial Instruments	(5,567)	(4,683)
Financial Liabilities, Collateral	(5,521)	(8,198)
Financial Liabilities, Net Amount	0	0
Counterparty C
Derivative [Line Items]
Financial Assets, Net Amount Recognized	3,504	64
Financial Assets, Financial Instruments	(3,504)	(64)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	0	0
Financial Liabilities, Net Amount Recognized	6,325	4,919
Financial Liabilities, Financial Instruments	(3,504)	(64)
Financial Liabilities, Collateral	(2,821)	(4,855)
Financial Liabilities, Net Amount	0	0
Other counterparties
Derivative [Line Items]
Financial Assets, Net Amount Recognized	2,058	15,389
Financial Assets, Financial Instruments	(1,956)	(10,938)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	102	4,451
Financial Liabilities, Net Amount Recognized	11,559	16,929
Financial Liabilities, Financial Instruments	(1,956)	(10,938)
Financial Liabilities, Collateral	(9,603)	(5,980)
Financial Liabilities, Net Amount	$ 0	$ 11

Operating Segments (Details)

Operating Segments (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2017USD ($)segment	Mar. 31, 2016USD ($)	Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of reportable operating segments | segment		3
Net interest income		$ 143,043	$ 119,304
Provision for credit losses		3,734	7,563
Non-interest income		91,773	81,693
Non-interest expense	[1]	155,665	135,800
Income tax expense		20,880	18,520
Net income		54,537	39,114
Total assets		19,146,062	15,575,653	$ 19,302,317
Taylor Capital Group, Inc.
Segment Reporting Information [Line Items]
Pretax merger related costs		258	3,300
Banking
Segment Reporting Information [Line Items]
Net interest income		131,449	109,608
Provision for credit losses		3,527	7,001
Non-interest income		42,531	35,019
Non-interest expense	[1]	107,839	90,640
Income tax expense		15,660	14,350
Net income		46,954	32,636
Total assets		16,009,339	13,235,848
Leasing
Segment Reporting Information [Line Items]
Net interest income		2,269	2,423
Provision for credit losses		(135)	437
Non-interest income		21,463	19,195
Non-interest expense	[1]	13,844	12,186
Income tax expense		4,119	3,509
Net income		5,904	5,486
Total assets		1,173,558	1,045,117
Mortgage Banking
Segment Reporting Information [Line Items]
Net interest income		9,325	7,273
Provision for credit losses		342	125
Non-interest income		27,779	27,479
Non-interest expense	[1]	33,982	32,974
Income tax expense		1,101	661
Net income		1,679	992
Total assets		$ 1,963,165	$ 1,294,688
[1]	Includes merger related and repositioning expenses of $258 thousand and $3.3 million in the Banking Segment for the three months ended March 31, 2017 and 2016, respectively.

Preferred Stock (Details)

Preferred Stock (Details)	Aug. 24, 2016$ / sharesshares	Nov. 20, 2015	Aug. 18, 2014$ / sharesshares	Mar. 31, 2017$ / sharesshares	Dec. 31, 2016$ / sharesshares
Series A Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares) | shares				4,000,000	4,000,000
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares				$ 25	$ 25
Preferred stock, dividend rate (percent)				8.00%	8.00%
Series A Preferred Stock | Taylor Capital Merger
Business Acquisition [Line Items]
Stock conversion			1
Preferred stock, shares outstanding (in shares) | shares			4,000,000
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares			$ 25
Preferred stock, dividend rate (percent)			8.00%
Series B Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares) | shares				125	125
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares				$ 1,000	$ 1,000
Preferred stock, dividend rate (percent)		8.00%		8.00%	8.00%
Series B Preferred Stock | American Chartered Merger
Business Acquisition [Line Items]
Stock conversion	1
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares	$ 1,000
Preferred stock, dividend rate (percent)	8.00%
Series D Preferred Stock | American Chartered Merger
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares) | shares	525