MB Financial 10-Q 7 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Aug. 07, 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	Jun. 30, 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		83,883,046
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 348,550	$ 364,783
Interest earning deposits with banks	115,707	98,686
Total cash and cash equivalents	464,257	463,469
Investment securities:
Securities available for sale, at fair value	1,567,071	1,696,195
Securities held to maturity, at amortized cost ($1,061,044 fair value at June 30, 2017 and $1,093,740 at December 31, 2016)	1,022,912	1,069,750
Non-marketable securities - FHLB and FRB stock	160,204	143,276
Total investment securities	2,750,187	2,909,221
Loans held for sale	718,916	716,883
Loans:
Total loans, excluding purchased credit-impaired loans	13,465,064	12,605,726
Purchased credit-impaired loans	149,077	163,077
Total loans	13,614,141	12,768,803
Less: Allowance for loan and lease losses	154,033	139,366
Net loans	13,460,108	12,629,437
Lease investments, net	346,036	311,327
Premises and equipment, net	288,148	293,910
Cash surrender value of life insurance	203,534	200,945
Goodwill	999,925	1,001,038
Other intangibles	58,783	62,959
Mortgage servicing rights, at fair value	249,688	238,011
Other real estate owned, net	11,063	26,279
Other real estate owned related to FDIC-assisted transactions	4,849	5,006
Other assets	409,563	443,832
Total assets	19,965,057	19,302,317
Deposits:
Non-interest bearing	6,388,292	6,408,169
Interest bearing	7,873,527	7,702,279
Total deposits	14,261,819	14,110,448
Short-term borrowings	1,993,358	1,569,288
Long-term borrowings	330,160	311,790
Junior subordinated notes issued to capital trusts	211,085	210,668
Accrued expenses and other liabilities	520,355	520,914
Total liabilities	17,316,777	16,723,108
STOCKHOLDERS’ EQUITY
Preferred stock, ($0.01 par value, authorized 10,000,000 shares at June 30, 2017 and December 31, 2016; Series A, 8% perpetual non-cumulative, 4,000,000 shares issued and outstanding at June 30, 2017 and December 31, 2016, $25 liquidation value; Series B, 8% cumulative voting convertible, 125 shares issued and outstanding at June 30, 2017 and December 31, 2016, $1,000 liquidation value)	115,572	115,572
Common stock, ($0.01 par value; authorized 120,000,000 shares at June 30, 2017 and December 31, 2016; issued 85,725,616 shares at June 30, 2017 and 85,630,748 shares at December 31, 2016)	857	856
Additional paid-in capital	1,681,252	1,678,826
Retained earnings	899,930	838,892
Accumulated other comprehensive income	10,520	5,190
Less: 1,856,099 and 1,905,479 shares of treasury common stock, at cost, at June 30, 2017 and December 31, 2016, respectively	(59,851)	(60,384)
Controlling interest stockholders’ equity	2,648,280	2,578,952
Non-controlling interest	0	257
Total stockholders’ equity	2,648,280	2,579,209
Total liabilities and stockholders’ equity	$ 19,965,057	$ 19,302,317

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Securities held to maturity, at amortized cost, fair value	$ 1,061,044	$ 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	85,725,616	85,630,748
Treasury stock, shares	1,856,099	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				6 Months Ended
	Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016
Loans:
Taxable	$ 143,426		$ 110,231		$ 277,163		$ 215,154
Nontaxable	2,791		2,741		5,671		5,327
Investment securities:
Taxable	8,717		7,799		17,839		17,365
Nontaxable	9,837		10,644		19,810		21,420
Other interest earning accounts and Federal funds sold	228		125		427		266
Total interest income	164,999		131,540		320,910		259,532
Interest expense:
Deposits	8,793		5,952		16,268		11,574
Short-term borrowings	3,912		910		6,292		1,631
Long-term borrowings and junior subordinated notes	3,300		2,076		6,313		4,421
Total interest expense	16,005		8,938		28,873		17,626
Net interest income	148,994		122,602		292,037		241,906
Provision for credit losses	9,699		2,829		13,433		10,392
Net interest income after provision for credit losses	139,295		119,773		278,604		231,514
Non-interest income:
Mortgage banking revenue	29,499		39,615		57,278		67,097
Lease financing revenue, net	18,401		15,708		39,819		34,754
Commercial deposit and treasury management fees	14,499		11,548		29,188		23,426
Trust and asset management fees	8,498		8,236		17,018		16,186
Card fees	4,413		4,045		8,979		7,570
Capital markets and international banking fees	3,586		2,771		6,839		5,998
Consumer and other deposit service fees	3,285		3,161		6,648		6,186
Brokerage fees	1,250		1,315		2,375		2,473
Loan service fees	2,037		1,961		4,006		3,713
Increase in cash surrender value of life insurance	1,301		850		2,589		1,704
Net gain on investment securities	137		269		368		269
Net loss on disposal of other assets	(4)		(2)		(127)		(50)
Other operating income	3,615		2,523		7,310		4,367
Total non-interest income	90,517		92,000		182,290		173,693
Non-interest expenses:
Salaries and employee benefits expense	102,566		95,004		204,117		180,595
Occupancy and equipment expense	15,284		13,415		30,328		26,675
Computer services and telecommunication expense	9,785		9,777		19,225		18,832
Advertising and marketing expense	3,245		2,964		6,406		5,842
Professional and legal expense	2,450		3,321		5,141		5,910
Other intangibles amortization expense	2,086		1,617		4,176		3,243
Branch exit and facilities impairment charges	6,589		155		5,907		199
Net loss (gain) recognized on other real estate owned and other related expenses	690		258		1,534		(88)
Other operating expenses	22,864		21,395		44,390		42,498
Total non-interest expenses	165,559	[1]	147,906	[1]	321,224	[2]	283,706	[2]
Income before income taxes	64,253		63,867		139,670		121,501
Income tax expense	19,787		20,455		40,667		38,975
Net income	44,466		43,412		99,003		82,526
Dividends on preferred shares	2,002		2,000		4,005		4,000
Net income available to common stockholders	$ 42,464		$ 41,412		$ 94,998		$ 78,526
Common share data:
Basic earnings per common share (in dollars per share)	$ 0.51		$ 0.56		$ 1.13		$ 1.07
Diluted earnings per common share (in dollars per share)	$ 0.50		$ 0.56		$ 1.12		$ 1.06
Weighted average common shares outstanding for basic earnings per common share (in shares)	83,842,963		73,475,258		83,753,195		73,402,995
Diluted weighted average common shares outstanding for diluted earnings per common share (in shares)	84,767,414		74,180,374		84,773,271		74,073,655
[1]	Includes merger related and repositioning expenses of $7.2 million and $2.6 million in the Banking Segment for the three months ended June 30, 2017 and 2016, respectively.
[2]	Includes merger related and repositioning expenses of $7.4 million and $5.9 million in the Banking Segment for the six months ended June 30, 2017 and 2016, respectively.

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 44,466	$ 43,412	$ 99,003	$ 82,526
Unrealized holding gains on investment securities, net of reclassification adjustments	3,979	7,706	10,033	23,282
Reclassification adjustment for amortization of unrealized gains on investment securities transferred to held to maturity from available for sale	(350)	(724)	(823)	(1,527)
Reclassification adjustments for gains included in net income	(137)	(269)	(368)	(269)
Other comprehensive income, before tax	3,492	6,713	8,842	21,486
Income tax expense related to items of other comprehensive income	(1,387)	(2,669)	(3,512)	(8,532)
Other comprehensive income, net of tax	2,105	4,044	5,330	12,954
Comprehensive income	$ 46,571	$ 47,456	$ 104,333	$ 95,480

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	82,650				82,526			124
Other comprehensive income, net of tax	12,954					12,954
Cash dividends declared on preferred shares	(4,000)				(4,000)
Cash dividends declared on common shares ($0.36 and $0.40 per share in 2016 and 2017, respectively)	(26,870)				(26,870)
Restricted common stock activity, net of tax	68		1	(632)			699
Stock option activity, net of tax	1,127			1,183			(56)
Repurchase of common shares in connection with employee benefit plans and held in trust for deferred compensation plan	(2,583)			288			(2,871)
Stock-based compensation expense	8,335			8,335
Purchase of additional investment in subsidiary from minority owners	(2,336)			(1,267)				(1,069)
Distributions to non-controlling interest	(94)							(94)
Ending balance at Jun. 30, 2016	2,156,535	115,280	757	1,288,777	783,468	28,731	(60,732)	254
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	99,003				99,003
Other comprehensive income, net of tax	5,330					5,330
Cash dividends declared on preferred shares	(4,005)				(4,005)
Cash dividends declared on common shares ($0.36 and $0.40 per share in 2016 and 2017, respectively)	(33,960)				(33,960)
Restricted common stock activity, net of tax	(3,287)			(6,837)			3,550
Stock option activity, net of tax	449		1	448
Repurchase of common shares in connection with employee benefit plans and held in trust for deferred compensation plan	(2,556)			461			(3,017)
Stock-based compensation expense	8,924			8,924
Purchase of additional investment in subsidiary from minority owners	(827)			(570)				(257)
Ending balance at Jun. 30, 2017	$ 2,648,280	$ 115,572	$ 857	$ 1,681,252	$ 899,930	$ 10,520	$ (59,851)	$ 0

CONSOLIDATED STATEMENTS OF CHA7

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.4	$ 0.36

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows From Operating Activities
Net income	$ 99,003	$ 82,526
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment and leased equipment	44,922	35,676
Branch exit and facilities impairment charges	5,907	199
Compensation expense for share-based payment plans	8,924	8,335
Net (gain) loss on sales of premises and equipment and leased equipment	(752)	157
Amortization of other intangibles	4,176	3,243
Provision for credit losses	13,433	10,392
Deferred income tax expense	22,072	22,327
Amortization of premiums and discounts on investment securities, net	20,754	23,488
Accretion of discounts on loans, net	(13,858)	(14,961)
Net gain on investment securities	(368)	(269)
Proceeds from sale of loans held for sale	2,340,861	2,772,282
Origination of loans held for sale	(2,321,902)	(2,833,315)
Net loss (gain) on sale of loans held for sale	887	(19,720)
Change in fair value of mortgage servicing rights	16,676	61,197
Net loss (gain) on other real estate owned	1,313	(468)
Increase in cash surrender value of life insurance	(2,589)	(1,704)
Increase in other assets, net	(24,770)	(95,794)
(Decrease) increase in other liabilities, net	(37,530)	18,900
Net cash provided by operating activities	177,159	72,491
Cash Flows From Investing Activities
Proceeds from sales of investment securities available for sale	2,271	842
Proceeds from maturities and calls of investment securities available for sale	167,856	133,638
Purchases of investment securities available for sale	(47,016)	(17,525)
Proceeds from maturities and calls of investment securities held to maturity	72,250	80,037
Purchases of investment securities held to maturity	(29,457)	(10,854)
Purchases of non-marketable securities - FHLB and FRB stock	(110,711)	(15,999)
Redemption of non-marketable securities - FHLB and FRB stock	93,783	0
Net increase in loans	(832,802)	(397,347)
Purchases of mortgage servicing rights	(786)	(2,961)
Purchases of premises and equipment and leased equipment	(78,833)	(63,123)
Proceeds from sales of premises and equipment and leased equipment	14,227	2,079
Proceeds from sale of other real estate owned	16,686	7,461
Proceeds from sale of other real estate owned related to FDIC-assisted transactions	2,587	2,891
Purchase of additional investment in subsidiary from minority owners	(827)	(2,336)
Net proceeds from FDIC related covered assets	(227)	(2,911)
Net cash used in investing activities	(730,999)	(286,108)
Cash Flows From Financing Activities
Net (decrease) increase in deposits	151,371	(69,119)
Proceeds from short-term borrowings - FHLB advances	2,350,000	850,000
Principal paid on short-term borrowings - FHLB advances	(2,125,000)	(525,000)
Net increase (decrease) in short-term borrowings	49,070	(83,743)
Proceeds from long-term borrowings	262,864	172,075
Principal paid on long-term borrowings	(94,494)	(53,805)
Treasury stock transactions, net	(2,556)	(2,583)
Stock options exercised	1,376	1,027
Dividends paid on preferred stock	(4,005)	(4,000)
Dividends paid on common stock	(33,998)	(26,553)
Net cash provided by financing activities	554,628	258,299
Net increase in cash and cash equivalents	788	44,682
Cash and cash equivalents:
Beginning of period	463,469	381,441
End of period	464,257	426,123
Cash payments for:
Interest paid to depositors and on other borrowed funds	27,666	17,416
Income tax payments, net	2,486	3,796
Supplemental Schedule of Noncash Investing Activities:
Investment securities held to maturity purchased not settled	2,553	0
Loans transferred to other real estate owned	2,658	2,637
Loans transferred to other real estate owned related to FDIC-assisted transactions	2,321	830
Loans transferred to repossessed assets	969	2,398
Operating leases rewritten as direct finance leases included as loans	1,547	363
Long-term borrowings transferred to short-term borrowings	150,000	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	6 Months Ended
	Jun. 30, 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 six months ended June 30, 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	6 Months Ended
	Jun. 30, 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 in 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. ASC Topic 718 "Compensation - Stock Compensation." New authoritative accounting guidance under ASC Topic 718 "Compensation - Stock Compensation" amends prior guidance by clarifying which changes to terms or conditions of a share-based payment award requires an entity to apply modification accounting. An entity should account for the effects of a modification unless the fair value, vesting conditions and classification of the modified award are the same as the original award. The new authoritative guidance will be effective for reporting periods after January 1, 2018 with early adoption permitted. This new authoritative guidance is not expected to have a significant impact on the Company's statements of operations or financial condition.

Earnings Per Common Share

Earnings Per Common Share	6 Months Ended
	Jun. 30, 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 Six Months Ended June 30, June 30, 2017 2016 2017 2016 Distributed earnings allocated to common stock $ 17,829 $ 14,216 $ 33,960 $ 26,870 Undistributed earnings 26,637 29,196 65,043 55,656 Net income 44,466 43,412 99,003 82,526 Less: preferred stock dividends 2,002 2,000 4,005 4,000 Net income available to common stockholders for basic earnings per common share 42,464 41,412 94,998 78,526 Plus: preferred stock dividends on convertible preferred stock 2 — 5 — Less: earnings allocated to participating securities 1 2 2 4 Earnings allocated to common stockholders for diluted earnings per common share $ 42,465 $ 41,410 $ 95,001 $ 78,522 Weighted average shares outstanding for basic earnings per common share 83,842,963 73,475,258 83,753,195 73,402,995 Dilutive effect of: Stock options 554,314 326,339 595,415 281,948 Restricted shares and units 363,003 378,777 417,433 388,712 Convertible preferred stock 7,134 — 7,228 — Total dilutive effect of equity awards and convertible preferred stock 924,451 705,116 1,020,076 670,660 Weighted average shares outstanding for diluted earnings per common share 84,767,414 74,180,374 84,773,271 74,073,655 Basic earnings per common share $ 0.51 $ 0.56 $ 1.13 $ 1.07 Diluted earnings per common share 0.50 0.56 1.12 1.06

Business Combinations

Business Combinations	6 Months Ended
	Jun. 30, 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. During the first quarter of 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 have been determined to be final as of March 31, 2017. 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 preferred stock were converted into shares of 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 and six months ended June 30, 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 Six Months Ended June 30, June 30, 2016 2016 (in thousands) Total revenues (net interest income plus non-interest income) $ 245,037 $ 476,797 Net income 51,657 99,081 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	6 Months Ended
	Jun. 30, 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 June 30, 2017 Available for Sale U.S. Government sponsored agencies and enterprises $ 23,141 $ 88 $ — $ 23,229 States and political subdivisions 367,385 20,494 (528 ) 387,351 Residential mortgage-backed securities 920,005 5,520 (7,920 ) 917,605 Commercial mortgage-backed securities 88,159 1,332 (165 ) 89,326 Corporate bonds 137,948 679 (71 ) 138,556 Equity securities 11,114 — (110 ) 11,004 Total Available for Sale 1,547,752 28,113 (8,794 ) 1,567,071 Held to Maturity States and political subdivisions 896,043 35,542 (376 ) 931,209 Residential mortgage-backed securities 126,869 2,966 — 129,835 Total Held to Maturity 1,022,912 38,508 (376 ) 1,061,044 Total $ 2,570,664 $ 66,621 $ (9,170 ) $ 2,628,115 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 in its investment securities portfolio, but approximately 20% of the state and political subdivisions portfolio consisted of securities issued by municipalities located in Illinois as of June 30, 2017 . Approximately 95% of the state and political subdivisions securities were general obligation issues, and 28% were insured or had another form of credit enhancement as of June 30, 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 June 30, 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 $ 18,891 $ (220 ) $ 1,885 $ (308 ) $ 20,776 $ (528 ) Residential mortgage-backed securities 528,088 (7,347 ) 46,755 (573 ) 574,843 (7,920 ) Commercial mortgage-backed securities 6,853 (44 ) 11,500 (121 ) 18,353 (165 ) Corporate bonds 10,350 (21 ) 9,944 (50 ) 20,294 (71 ) Equity securities 11,004 (110 ) — — 11,004 (110 ) Total Available for Sale 575,186 (7,742 ) 70,084 (1,052 ) 645,270 (8,794 ) Held to Maturity States and political subdivisions 55,170 (370 ) 2,076 (6 ) 57,246 (376 ) Total $ 630,356 $ (8,112 ) $ 72,160 $ (1,058 ) $ 702,516 $ (9,170 ) 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 June 30, 2017 was 457 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 June 30, 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 June 30, 2017 , management does not have the intent to sell any of the securities in the table above at June 30, 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 June 30, 2017 , management believes the impairments detailed in the table above at June 30, 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 Six Months Ended June 30, June 30, 2017 2016 2017 2016 Realized gains $ 137 $ 302 $ 374 $ 323 Realized losses — (33 ) (6 ) (54 ) Net gains $ 137 $ 269 $ 368 $ 269 The amortized cost and fair value of investment securities as of June 30, 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 $ 141,485 $ 142,145 Due after one year through five years 116,187 119,931 Due after five years through ten years 52,745 54,341 Due after ten years 218,057 232,719 Equity securities 11,114 11,004 Residential and commercial mortgage-backed securities 1,008,164 1,006,931 1,547,752 1,567,071 Held to maturity: Due in one year or less 49,998 50,083 Due after one year through five years 150,770 157,042 Due after five years through ten years 197,187 208,048 Due after ten years 498,088 516,036 Residential mortgage-backed securities 126,869 129,835 1,022,912 1,061,044 Total $ 2,570,664 $ 2,628,115 Investment securities with a carrying amount of $832.9 million at June 30, 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 $725.7 million and $756.5 million were required to be pledged at June 30, 2017 and December 31, 2016 , respectively.

Loans

Loans	6 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Loans	Loans Loans consist of the following at (in thousands): June 30, December 31, Commercial loans $ 4,703,328 $ 4,346,506 Commercial loans collateralized by assignment of lease payments 2,076,911 2,002,976 Commercial real estate 3,882,754 3,788,016 Residential real estate 1,411,259 1,060,828 Construction real estate 449,116 518,562 Indirect vehicle 627,819 541,680 Home equity 238,952 266,377 Other consumer loans 74,925 80,781 Total loans, excluding purchased credit-impaired loans 13,465,064 12,605,726 Purchased credit-impaired loans 149,077 163,077 Total loans $ 13,614,141 $ 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 June 30, 2017 and December 31, 2016 , the Company had $5.4 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 $4.0 billion and $3.2 billion were required to be pledged at June 30, 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 June 30, 2017 and December 31, 2016 (in thousands): Current 30-59 Days 60-89 Days Loans Past Due Total Total June 30, 2017 Commercial $ 4,688,835 $ 2,963 $ 6,288 $ 5,242 $ 14,493 $ 4,703,328 Commercial collateralized by assignment of lease payments 2,056,105 16,043 3,935 828 20,806 2,076,911 Commercial real estate: Healthcare 649,415 — — — — 649,415 Industrial 824,597 — 4,375 2,875 7,250 831,847 Multifamily 589,626 — — 570 570 590,196 Retail 490,205 2,348 — 1,061 3,409 493,614 Office 407,469 650 — 1,645 2,295 409,764 Other 904,560 2,543 224 591 3,358 907,918 Residential real estate 1,400,794 914 1,151 8,400 10,465 1,411,259 Construction real estate 449,116 — — — — 449,116 Indirect vehicle 624,214 2,656 709 240 3,605 627,819 Home equity 233,135 638 297 4,882 5,817 238,952 Other consumer 74,537 275 70 43 388 74,925 Total loans, excluding purchased credit-impaired loans 13,392,608 29,030 17,049 26,377 72,456 13,465,064 Purchased credit-impaired loans 83,158 6,095 3,625 56,199 65,919 149,077 Total loans $ 13,475,766 $ 35,125 $ 20,674 $ 82,576 $ 138,375 $ 13,614,141 Non-performing loan aging $ 24,876 $ 490 $ 767 $ 26,070 $ 27,327 $ 52,203 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 June 30, 2017 and December 31, 2016 (in thousands): June 30, 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 $ 7,126 $ — $ 11,222 $ 1,406 Commercial collateralized by assignment of lease payments 359 681 1,364 1,197 Commercial real estate: Healthcare — — — — Industrial 2,876 — 276 1,064 Multifamily 2,951 — 2,662 — Office 2,041 — 896 6,381 Retail 1,193 — 384 — Other 131 320 83 21 Residential real estate 17,229 147 16,538 235 Construction real estate — — — — Indirect vehicle 2,294 — 2,355 10 Home equity 14,808 — 13,187 — Other consumer 5 42 7 64 Total $ 51,013 $ 1,190 $ 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 June 30, 2017 and December 31, 2016 (in thousands): Pass Special Substandard Doubtful Total June 30, 2017 Commercial $ 4,485,246 $ 150,485 $ 67,597 $ — $ 4,703,328 Commercial collateralized by assignment of lease payments 2,057,116 10,446 9,349 — 2,076,911 Commercial real estate: Healthcare 608,517 25,640 15,258 — 649,415 Industrial 799,572 25,807 6,468 — 831,847 Multifamily 579,971 155 10,070 — 590,196 Retail 483,638 6,600 3,376 — 493,614 Office 402,731 2,296 4,737 — 409,764 Other 812,418 61,152 34,348 — 907,918 Construction real estate 448,584 532 — — 449,116 Total $ 10,677,793 $ 283,113 $ 151,203 $ — $ 11,112,109 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 $16.7 million and $17.3 million of the substandard loans were non-performing as of June 30, 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 June 30, 2017 and December 31, 2016 (in thousands): Performing Non-performing Total June 30, 2017 Residential real estate $ 1,393,883 $ 17,376 $ 1,411,259 Indirect vehicle 625,525 2,294 627,819 Home equity 224,144 14,808 238,952 Other consumer 74,878 47 74,925 Total $ 2,318,430 $ 34,525 $ 2,352,955 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 $41.3 million and $29.1 million at June 30, 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 June 30, 2017 and December 31, 2016 (in thousands): June 30, 2017 Three Months Ended Six Months Ended Unpaid Recorded Partial Allowance for Average Interest Average Interest With no related allowance recorded: Commercial $ 3,501 $ 3,501 $ — $ — $ 2,218 $ 22 $ 4,875 $ 37 Commercial collateralized by assignment of lease payments 16 1 15 — 134 — 607 — Commercial real estate: Healthcare — — — — — — — — Industrial 2,167 1,871 296 — 1,803 8 1,854 8 Multifamily 1,824 1,824 — — 2,248 — 2,543 29 Retail 4,328 2,587 1,741 — 2,356 27 1,641 27 Office 1,865 1,865 — — 1,911 6 1,620 6 Other — — — — — — — — Residential real estate — — — — — — — — Construction real estate — — — — — — — — Indirect vehicle 250 144 106 — 305 5 282 10 Home equity 815 815 — — 815 — 704 — Other consumer — — — — — — — — With an allowance recorded: Commercial 7,666 7,666 — 1,076 8,428 26 8,519 173 Commercial collateralized by assignment of lease payments — — — — — — — — Commercial real estate: Healthcare — — — — — — — — Industrial 3,252 3,252 — 493 3,309 32 1,664 32 Multifamily 570 570 — 223 565 — 284 — Retail 1,851 1,851 — 8 1,855 28 2,713 28 Office — — — — — — — — Other — — — — — — — — Residential real estate 18,637 16,956 1,681 1,839 16,890 4 16,349 5 Construction real estate — — — — — — — — Indirect vehicle — — — — — — — — Home equity 30,074 28,204 1,870 2,940 28,197 16 28,023 27 Other consumer — — — — — — — — Total $ 76,816 $ 71,107 $ 5,709 $ 6,579 $ 71,034 $ 174 $ 71,678 $ 382 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 $29.7 million and $32.7 million that have been modified and are performing in accordance with those modified terms as of June 30, 2017 and December 31, 2016 , respectively. In addition, impaired loans included $23.7 million and $27.1 million of non-performing restructured loans as of June 30, 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. 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 June 30, 2017 (dollars in thousands): June 30, 2017 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Commercial 5 $ 2,491 $ 2,491 $ 373 Commercial real estate Industrial 2 2,787 2,787 — Office 1 549 549 — Other 1 147 147 — Residential real estate 3 493 493 86 Home equity 2 46 46 3 Total 14 $ 6,513 $ 6,513 $ 462 Non-Performing: Commercial 2 $ 676 $ 676 $ — Commercial real estate: Multifamily 3 290 290 — Retail 1 906 906 — Residential real estate 8 1,122 1,122 289 Indirect vehicle 8 77 77 25 Home equity 2 593 593 57 Total 24 $ 3,664 $ 3,664 $ 371 The following table presents loans that were restructured during the six months ended June 30, 2017 (dollars in thousands): June 30, 2017 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Commercial 5 $ 2,491 $ 2,491 $ 373 Commercial real estate Industrial 2 2,787 2,787 — Office 1 549 549 — Other 1 147 147 — Residential real estate 6 902 902 135 Home equity 3 78 78 6 Total 18 $ 6,954 $ 6,954 $ 514 Non-Performing: Commercial 2 $ 676 $ 676 $ — Commercial real estate: Multifamily 3 290 290 — Retail 1 906 906 — Residential real estate 17 2,380 2,380 443 Indirect vehicle 11 97 97 29 Home equity 3 593 593 57 Total 37 $ 4,942 $ 4,942 $ 529 The following table presents loans that were restructured during the three months ended June 30, 2016 (dollars in thousands): June 30, 2016 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Commercial 1 $ 1,870 $ 1,870 $ 412 Total 1 $ 1,870 $ 1,870 $ 412 Non-Performing: Commercial 4 $ 8,607 $ 8,607 $ 3,500 Residential real estate 1 83 83 — Indirect vehicle 8 69 69 21 Home equity 14 2,030 2,030 15 Total 27 $ 10,789 $ 10,789 $ 3,536 The following table presents loans that were restructured during the six months ended June 30, 2016 (dollars in thousands): June 30, 2016 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Commercial 1 $ 1,870 $ 1,870 $ 412 Home equity 2 410 410 — Total 3 $ 2,280 $ 2,280 $ 412 Non-Performing: Commercial 4 $ 8,607 $ 8,607 $ 3,500 Residential real estate 2 155 155 — Indirect vehicle 18 149 149 43 Home equity 23 3,111 3,111 66 Total 47 $ 12,022 $ 12,022 $ 3,609 Of the troubled debt restructurings entered into during the past twelve months, none subsequently defaulted during the six months ended June 30, 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 six months ended June 30, 2017 (in thousands): Performing Non-performing Beginning balance $ 32,687 $ 27,068 Additions 6,954 4,942 Charge-offs — (383 ) Principal payments, net (631 ) (4,013 ) Removals (10,630 ) (2,389 ) Transfer to other real estate owned — (289 ) Transfers in 1,448 170 Transfers out (170 ) (1,448 ) Ending balance $ 29,658 $ 23,658 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 six months ended June 30, 2017 (in thousands): June 30, 2017 Extended Maturity, Delay in Amortization Extended Payments or and Reduction Maturity and/or Reduction of of Interest Rate Amortization Interest Rate Total Commercial $ — $ 3,167 $ — $ 3,167 Commercial collateralized by assignment of lease payments — — — — Commercial real estate: Healthcare — — — — Industrial — 2,787 — 2,787 Multifamily — 290 — 290 Retail — 906 — 906 Office — 549 — 549 Other — 147 — 147 Residential real estate 1,110 1,589 583 3,282 Construction real estate — — — — Indirect vehicle — — 97 97 Home equity — 1 670 671 Other consumer — — — — Total $ 1,110 $ 9,436 $ 1,350 $ 11,896 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 June 30, 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 June 30, 2017 Allowance for credit losses: Three Months Ended Beginning balance $ 40,690 $ 12,143 $ 58,220 $ 8,131 $ 14,859 $ 3,624 $ 5,312 $ 1,191 $ 2,328 $ 146,498 Charge-offs 700 — 262 270 — 930 261 498 — 2,921 Recoveries 1,339 249 362 58 47 565 292 109 — 3,021 Provision 2,454 373 4,927 330 357 704 206 412 (64 ) 9,699 Ending balance $ 43,783 $ 12,765 $ 63,247 $ 8,249 $ 15,263 $ 3,963 $ 5,549 $ 1,214 $ 2,264 $ 156,297 Six 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 868 — 1,347 360 — 2,341 434 944 — 6,294 Recoveries 2,849 712 880 586 159 1,217 575 338 — 7,316 Provision (2,859 ) (185 ) 11,907 2,052 346 1,666 (61 ) 779 (212 ) 13,433 Ending balance $ 43,783 $ 12,765 $ 63,247 $ 8,249 $ 15,263 $ 3,963 $ 5,549 $ 1,214 $ 2,264 $ 156,297 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 1,076 $ — $ 724 $ 1,839 $ — $ — $ 2,940 $ — $ 516 $ 7,095 Collectively evaluated for impairment 42,619 12,765 62,115 6,410 15,227 3,963 2,609 1,214 1,748 148,670 Acquired and accounted for under ASC 310-30 (1) 88 — 408 — 36 — — — — 532 Total ending allowance balance $ 43,783 $ 12,765 $ 63,247 $ 8,249 $ 15,263 $ 3,963 $ 5,549 $ 1,214 $ 2,264 $ 156,297 Loans: Individually evaluated for impairment $ 11,167 $ 1 $ 13,820 $ 16,956 $ — $ 144 $ 29,019 $ — $ — $ 71,107 Collectively evaluated for impairment 4,692,161 2,076,910 3,868,934 1,394,303 449,116 627,675 209,933 74,925 — 13,393,957 Acquired and accounted for under ASC 310-30 (1) 17,797 — 38,859 73,872 5,201 — 11,558 1,790 — 149,077 Total ending loans balance $ 4,721,125 $ 2,076,911 $ 3,921,613 $ 1,485,131 $ 454,317 $ 627,819 $ 250,510 $ 76,715 $ — $ 13,614,141 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 June 30, 2016 Allowance for credit losses: Three Months Ended Beginning balance $ 46,962 $ 10,505 $ 46,785 $ 5,596 $ 14,614 $ 2,732 $ 5,022 $ 2,277 $ 3,239 $ 137,732 Charge-offs 72 2,347 1,720 476 144 651 619 395 — 6,424 Recoveries 952 467 1,843 82 17 501 193 141 — 4,196 Provision 2,455 1,924 (868 ) (402 ) (257 ) 518 (397 ) 376 (520 ) 2,829 Ending balance $ 50,297 $ 10,549 $ 46,040 $ 4,800 $ 14,230 $ 3,100 $ 4,199 $ 2,399 $ 2,719 $ 138,333 Six 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 785 2,921 2,072 844 144 1,582 857 807 — 10,012 Recoveries 1,332 517 2,437 106 44 964 511 534 — 6,445 Provision 10,434 2,519 200 (196 ) (783 ) 1,300 (2,829 ) 396 (649 ) 10,392 Ending balance $ 50,297 $ 10,549 $ 46,040 $ 4,800 $ 14,230 $ 3,100 $ 4,199 $ 2,399 $ 2,719 $ 138,333 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 11,388 $ 391 $ 426 $ 2,446 $ — $ — $ 2,719 $ — $ 731 $ 18,101 Collectively evaluated for impairment 38,762 10,158 45,084 2,354 14,194 3,100 1,480 2,399 1,988 119,519 Acquired and accounted for under ASC 310-30 (1) 147 — 530 — 36 — — — — 713 Total ending allowance balance $ 50,297 $ 10,549 $ 46,040 $ 4,800 $ 14,230 $ 3,100 $ 4,199 $ 2,399 $ 2,719 $ 138,333 Loans: Individually evaluated for impairment $ 31,652 $ 1,170 $ 7,962 $ 13,049 $ — $ 146 $ 29,419 $ — $ — $ 83,398 Collectively evaluated for impairment 3,529,848 1,793,295 2,819,758 740,658 357,807 491,334 169,203 75,775 — 9,977,678 Acquired and accounted for under ASC 310-30 (1) 21,745 — 26,199 59,538 13,795 — 13,091 2,443 — 136,811 Total ending loans balance $ 3,583,245 $ 1,794,465 $ 2,853,919 $ 813,245 $ 371,602 $ 491,480 $ 211,713 $ 78,218 $ — $ 10,197,887 (1) Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 “Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality.” Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date without a carryover of the related allowance for loan and lease losses. These acquired loans are segregated into three types: pass rated loans with no discount attributable to credit quality, non-impaired loans with a discount attributable at least in part to credit quality and impaired loans with evidence of significant credit deterioration. • Pass rated loans (typically performing loans) are accounted for in accordance with ASC Topic 310-20 "Nonrefundable Fees and Other Costs" as these loans do not have evidence of credit deterioration since origination. • Non-impaired loans (typically performing substandard loans) are accounted for in accordance with ASC Topic 310-30 if they display at least some level of credit deterioration since origination. • Impaired loans (typically substandard loans on non-accrual status) are accounted for in accordance with ASC Topic 310-30 as they display significant credit deterioration since origination. For pass rated loans (non-purchased credit-impaired loans), the difference between the estimated fair value of the loans and the principal outstanding is accreted over the remaining life of the loans. In accordance with ASC 310-30, for both purchased non-impaired loans and purchased credit-impaired loans, the loans are pooled by loan type and the difference between contractually required payments at acquisition and the cash flows expected to be collected is referred to as the non-accretable difference. Further, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan pools when there is a reasonable expectation about the amount and timing of such cash flows. Substantially all of the loans acquired in FDIC-assisted transactions displayed at least some level of credit deterioration and as such are included as non-impaired and impaired loans as described immediately above. During the six months ended June 30, 2017 , there was a negative provision for credit losses of $203 thousand and net charge-offs of $131 thousand in relation to purchased credit-impaired loans. There was $532 thousand and $866 thousand in allowance for loan and lease losses related to these purchased credit-impaired loans at June 30, 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 and six months ended June 30, 2017 and 2016 (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Balance at beginning of period $ 14,911 $ 13,970 $ 16,050 $ 12,596 Purchases — — 43 — Accretion (2,831 ) (2,419 ) (5,019 ) (4,629 ) Other (1) 606 1,609 1,612 5,193 Balance at end of period $ 12,686 $ 13,160 $ 12,686 $ 13,160 (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): June 30, 2017 Purchased Purchased Non-Credit-Impaired Total Covered loans (1) : Consumer related $ 16,477 $ — $ 16,477 Non-covered loans: Commercial loans 17,797 482,140 499,937 Commercial loans collateralized by assignment of lease payments — 55,661 55,661 Commercial real estate 38,859 1,036,159 1,075,018 Construction real estate 5,201 12,840 18,041 Consumer related 5,059 313,767 318,826 Total non-covered loans 66,916 1,900,567 1,967,483 Total acquired $ 83,393 $ 1,900,567 $ 1,983,960 (1) Covered loans refer to loans covered under loss-sharing agreements with the FDIC. In addition to loans acquired through a business combination noted in the table above, consumer related purchased credit-impaired loans includes re-purchase transactions

Goodwill and Intangibles

Goodwill and Intangibles	6 Months Ended
	Jun. 30, 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 six months ended June 30, 2017 or 2016 . The carrying amount of goodwill was $999.9 million and $1.0 billion at June 30, 2017 and December 31, 2016 , respectively. The following table presents the changes in the carrying amount of goodwill for the six months ended June 30, 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 during the first quarter of 2017. 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 June 30, 2017 . The following table presents the changes during the six months ended June 30, 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 June 30, 2017 (in thousands): June 30, 2017 Balance at beginning of period $ 62,959 Amortization expense (4,176 ) Balance at end of period $ 58,783 Gross carrying amount $ 112,820 Accumulated amortization (54,037 ) Net book value $ 58,783 The following presents the estimated future amortization expense of other intangible assets (in thousands): Year ending December 31, Amount 2017 $ 4,017 2018 7,451 2019 5,674 2020 5,022 2021 4,790 Thereafter 31,829 $ 58,783

Deposits

Deposits	6 Months Ended
	Jun. 30, 2017
Banking and Thrift [Abstract]
Deposits	Deposits The composition of deposits was as follows as of June 30, 2017 and December 31, 2016 (in thousands): June 30, December 31, 2017 2016 Demand deposit accounts, non-interest bearing $ 6,388,292 $ 6,408,169 NOW, money market and interest bearing deposits 4,600,506 4,543,004 Savings accounts 1,109,155 1,135,992 Certificates of deposit, $250,000 or more 1,221,043 1,144,121 Other certificates of deposit 942,823 879,162 Total $ 14,261,819 $ 14,110,448 Certificates of deposit of $250,000 or more included $820.8 million and $795.0 million of brokered deposits at June 30, 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	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Short-Term Borrowings	Short-Term Borrowings Short-term borrowings were as follows as of June 30, 2017 and December 31, 2016 (dollars in thousands): June 30, 2017 December 31, 2016 Weighted Average Interest Rate Amount Weighted Average Interest Rate Amount Customer repurchase agreements 0.22 % $ 203,358 0.22 % $ 237,538 Federal Home Loan Bank advances 1.18 1,650,000 0.63 1,275,000 Federal funds purchased 1.32 140,000 0.80 46,750 Line of credit — — 2.52 10,000 Total 1.09 % $ 1,993,358 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 $1.7 billion at June 30, 2017 and $1.3 billion at December 31, 2016 . At June 30, 2017 , the interest rate on the advances outstanding on that date had rates ranging from 0.80% to 1.30% with maturities from July 2017 to June 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 June 30, 2017 , and $10.0 million were outstanding as of December 31, 2016 . The line of credit is scheduled to mature on June 30, 2018.

Long-Term Borrowings

Long-Term Borrowings	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Long-Term Borrowings	Long-Term Borrowings Long-term borrowings were as follows as of June 30, 2017 and December 31, 2016 (dollars in thousands): June 30, 2017 December 31, 2016 Weighted Average Interest Rate Amount Weighted Average Interest Rate Amount Federal Home Loan Bank advances 1.48 % $ 231,417 0.85 % $ 230,865 Notes payable 3.99 86,743 4.18 66,925 Term note 2.97 12,000 2.52 14,000 Total 2.19 % $ 330,160 1.64 % $ 311,790 The Company had Federal Home Loan Bank ("FHLB") advances with remaining contractual maturities greater than one year of $231.4 million at June 30, 2017 and $230.9 million at December 31, 2016 . As of June 30, 2017 , the advances had fixed terms with effective interest rates, net of discounts, ranging from 1.35% to 5.87% and maturities ranging from December 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 $71.5 million and $66.9 million at June 30, 2017 and December 31, 2016 , respectively, which as of June 30, 2017 , were accruing interest at rates ranging from 2.25% to 7.40% , with a weighted average rate of 4.24% . Lease investments includes equipment with an amortized cost of $85.9 million and $79.6 million at June 30, 2017 and December 31, 2016 , respectively, that is pledged as collateral on these notes. At June 30, 2017, the Company also had $15.2 million in other secured borrowings (included in the notes payable above) with a weighted average rate of 2.81% . 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 June 30, 2017 , $12.0 million of principal was outstanding.

Junior Subordinated Notes Issue

Junior Subordinated Notes Issued to Capital Trusts	6 Months Ended
	Jun. 30, 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 June 30, 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 $6.6 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	6 Months Ended
	Jun. 30, 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 June 30, 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 June 30, 2017 December 31, 2016 Commitments to extend credit: Home equity lines $ 224,881 $ 235,279 Other commitments 3,862,382 3,679,259 Letters of credit: Standby 152,646 185,386 Commercial 488 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 June 30, 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 June 30, 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 $34.0 million to $153.1 million from $187.2 million at December 31, 2016 . Of the $153.1 million in commitments outstanding at June 30, 2017 , approximately $16.1 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 June 30, 2017 , the Company had approximately $3.6 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 June 30, 2017 , approximately 20% of our investments in securities issued by states and political subdivisions were within the state of Illinois. We did not hold any direct exposure to the state of Illinois as of June 30, 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	6 Months Ended
	Jun. 30, 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 June 30, 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) June 30, 2017 Financial assets Securities available for sale: U.S Government sponsored agencies and enterprises $ 23,229 $ — $ 23,229 $ — States and political subdivisions 387,351 — 386,978 373 Residential mortgage-backed securities 917,605 — 917,516 89 Commercial mortgage-backed securities 89,326 — 89,326 — Corporate bonds 138,556 — 138,556 — Equity securities 11,004 11,004 — — Loans held for sale 718,916 — 718,916 — Loans 14,867 — 14,867 — Mortgage servicing rights 249,688 — — 249,688 Assets held in trust for deferred compensation 19,202 19,202 — — Derivative financial instruments 37,948 3,055 32,194 2,699 Financial liabilities Other liabilities (1) 19,202 19,202 — — Derivative financial instruments 40,131 1,870 38,261 — 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 June 30, 2017 Valuation Technique Unobservable Input Range (in thousands) States and political subdivisions $ 373 Discounted cash flows Credit assumption 50% Loss Residential mortgage-backed securities 89 Discounted cash flows Constant pre-payment rates (CPR) 1% - 3% Mortgage servicing rights 249,688 Discounted cash flows CPR 6.8% - 8.6% Discount rate 9.53 - 11.05 Maturity (months) 322 - 357 Delinquencies 1.97 - 4.61 Costs to service $ 66 - $ 226 Additive delinquent costs to service $ 175 - $ 1,000 Derivative financial instruments (mortgage 2,699 Sales cash flows Expected closing ratio 70% - 95% interest rate lock commitments) Expected delivery price 98.78 bps - 108.44 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 June 30, 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) June 30, 2017 Weighted average CPR 7.70 % Impact on fair value of 10% adverse change $ (8,174 ) Impact on fair value of 20% adverse change (15,901 ) Weighted average discount rate 9.81 % Impact on fair value of 10% adverse change $ (10,565 ) Impact on fair value of 20% adverse change (20,309 ) Weighted average delinquency rate 4.40 % Impact on fair value of 10% adverse change $ (2,091 ) Impact on fair value of 20% adverse change (3,914 ) Weighted average costs to service $ 89 Impact on fair value of 10% adverse change (4,665 ) Impact on fair value of 20% adverse change (9,330 ) The Company did not have any transfers between Level 1 and Level 2 of the fair value hierarchy during the six months ended June 30, 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): Six Months Ended June 30, 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 — — 786 2,961 — — Originations — — 27,568 25,043 — — Included in earnings — — (16,677 ) (61,197 ) (461 ) 8,852 Principal payments (82 ) (117 ) — — — — Sales — — — — — — Balance, ending of period $ 462 $ 656 $ 249,688 $ 134,969 $ 2,699 $ 12,674 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 June 30, 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 June 30, 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) June 30, 2017 Financial assets: Impaired loans $ 53,385 $ — $ — $ 53,385 Non-financial assets: Foreclosed assets 16,396 — — 16,396 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 June 30, 2017 Technique Input Range (in thousands) Impaired loans $ 53,385 Appraisal of collateral Appraisal adjustments 5% - 10% Foreclosed assets 16,396 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): June 30, 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 $ 348,550 $ 348,550 $ 348,550 $ — $ — Interest earning deposits with banks 115,707 115,707 115,707 — — Investment securities available for sale 1,567,071 1,567,071 11,004 1,555,605 462 Investment securities held to maturity 1,022,912 1,061,044 — 1,061,044 — Non-marketable securities - FHLB and FRB stock 160,204 160,204 — — 160,204 Loans held for sale 718,916 718,916 — 718,916 — Loans, net 13,460,108 13,736,459 — 14,867 13,721,592 Accrued interest receivable 59,675 59,675 59,675 — — Derivative financial instruments 37,948 37,948 3,055 32,194 2,699 Financial Liabilities: Non-interest bearing deposits $ 6,388,292 $ 6,388,292 $ 6,388,292 $ — $ — Interest bearing deposits 7,873,527 7,868,383 — — 7,868,383 Short-term borrowings 1,993,358 1,993,656 — — 1,993,656 Long-term borrowings 330,160 335,643 — — 335,643 Junior subordinated notes issued to capital trusts 211,085 165,727 — — 165,727 Accrued interest payable 5,495 5,495 5,495 — — Derivative financial instruments 40,131 40,131 1,870 38,261 — 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	6 Months Ended
	Jun. 30, 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 Six Months Ended June 30, June 30, 2017 2016 2017 2016 Total compensation expense for share-based payment plans during the period $ 4,443 $ 4,284 $ 8,924 $ 8,335 Amount of related income tax benefit recognized in income 1,916 1,671 6,338 3,254 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 June 30, 2017 , there were 2,912,067 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 six months ended June 30, 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 159,540 45.54 Exercised (211,770 ) 27.04 Expired — — Forfeited or cancelled (9,594 ) 31.32 Options outstanding as of June 30, 2017 1,878,581 $ 29.01 5.40 $ 28,501 Options exercisable as of June 30, 2017 1,238,014 $ 26.84 3.88 $ 21,318 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 six months ended June 30, 2017 : June 30, 2017 Risk-free interest rate 2.18 % Expected volatility of Company’s stock 22.66 % Expected dividend yield 1.67 % Expected life of options 5.9 years Weighted average fair value per option of options granted during the year $ 9.43 The total intrinsic value of options exercised during the six months ended June 30, 2017 and 2016 was $3.9 million and $1.9 million , respectively. The following is a summary of changes in restricted shares and units for the six months ended June 30, 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 379,335 45.77 Vested (331,875 ) 31.11 Forfeited or cancelled (15,293 ) 33.42 Shares and units outstanding at June 30, 2017 1,030,974 36.55 The total intrinsic value of restricted shares that vested during the six months ended June 30, 2017 and 2016 was $15.5 million and $8.4 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 June 30, 2017 , there was $30.7 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 June 30, 2017 , the weighted-average period over which the unrecognized compensation expense is expected to be recognized was approximately two years.

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 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 payable as of June 30, 2017 and 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 June 30, 2017 , the Company’s credit exposure relating to interest rate swaps was approximately $11.3 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 $83 thousand at June 30, 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 June 30, 2017 and December 31, 2016 (in thousands): Asset Derivatives Liability Derivatives June 30, 2017 December 31, 2016 June 30, 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) $ — $ — $ — $ — $ 83 $ (2 ) $ 107 $ (4 ) Stand-alone derivative instruments: (2) Interest rate swap contracts 1,407,132 23,773 1,310,057 25,471 1,407,132 (23,773 ) 1,310,057 (25,471 ) Interest rate options contracts 322,810 1,369 217,546 881 322,810 (1,369 ) 217,546 (881 ) Foreign exchange contracts 37,701 2,163 40,641 4,429 37,254 (1,991 ) 40,505 (4,265 ) Spot foreign exchange contracts 7,137 89 1,691 12 6,030 (38 ) 660 (5 ) Mortgage related derivatives: Interest rate swap contracts 778,000 4,800 383,000 2,946 798,000 (11,088 ) 1,458,000 (31,212 ) Treasury futures contracts 27,500 96 15,500 41 35,000 (288 ) — — TBA mortgage securities — — — — 110,000 (940 ) 55,000 (132 ) Forward loan sale commitments 742,000 2,959 585,000 7,646 209,000 (642 ) 386,000 (1,915 ) Interest rate lock commitments 603,018 2,699 543,901 3,160 — — — — Total stand-alone derivative instruments 3,925,298 37,948 3,097,336 44,586 2,925,226 (40,129 ) 3,467,768 (63,881 ) Total $ 3,925,298 $ 37,948 $ 3,097,336 $ 44,586 $ 2,925,309 $ (40,131 ) $ 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 Six Months Ended June 30, June 30, 2017 2016 2017 2016 Derivative instruments designated as hedges of fair value: Interest rate swap contracts $ 1 $ 1 $ 2 $ 2 Stand-alone derivative instruments: Interest rate swap contracts 1,624 (1 ) 3,473 2,337 Interest rate options contracts — (1 ) — 35 Foreign exchange contracts 197 371 260 499 Spot foreign exchange contracts 729 (2 ) 1,407 301 Mortgage related derivatives (301 ) 16,060 (10,442 ) 39,771 Total stand-alone derivative instruments 2,249 16,427 (5,302 ) 42,943 Total $ 2,250 $ 16,428 $ (5,300 ) $ 42,945 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 June 30, 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 $ 7,291 $ — $ 7,291 $ 17,950 $ — $ 17,950 Foreign exchange contracts 995 — 995 1,531 — 1,531 Mortgage related derivatives 7,855 — 7,855 12,958 — 12,958 Total derivatives 16,141 — 16,141 32,439 — 32,439 Repurchase agreements — — — 203,358 — 203,358 Total $ 16,141 $ — $ 16,141 $ 235,797 $ — $ 235,797 Financial Assets Financial Liabilities Net Amount Recognized Financial Instruments Collateral Net Amount Net Amount Recognized Financial Instruments Collateral Net Amount Derivatives: Counterparty A $ 2,807 $ (2,807 ) $ — $ — $ 9,218 $ (2,807 ) $ (6,411 ) $ — Counterparty B 2,206 (2,206 ) — — 7,759 (2,206 ) (5,553 ) — Counterparty C 247 (247 ) — — 2,679 (247 ) (2,432 ) — Other counterparties 10,881 (8,529 ) — 2,352 12,783 (8,529 ) (4,237 ) 17 Total derivatives 16,141 (13,789 ) — 2,352 32,439 (13,789 ) (18,633 ) 17 Repurchase agreements — — — — 203,358 — (203,358 ) — Total $ 16,141 $ (13,789 ) $ — $ 2,352 $ 235,797 $ (13,789 ) $ (221,991 ) $ 17 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	6 Months Ended
	Jun. 30, 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 June 30, 2017 Net interest income $ 135,982 $ 2,345 $ 10,667 $ 148,994 Provision for credit losses 8,890 410 399 9,699 Non-interest income 42,838 18,180 29,499 90,517 Non-interest expense (1) 116,369 13,436 35,754 165,559 Income tax expense 15,662 2,525 1,600 19,787 Net income $ 37,899 $ 4,154 $ 2,413 $ 44,466 Total assets $ 16,320,111 $ 1,275,386 $ 2,369,560 $ 19,965,057 Three months ended June 30, 2016 Net interest income $ 112,152 $ 2,411 $ 8,039 $ 122,602 Provision for credit losses 2,995 (356 ) 190 2,829 Non-interest income 36,668 15,717 39,615 92,000 Non-interest expense (1) 99,882 11,126 36,898 147,906 Income tax expense 13,350 2,879 4,226 20,455 Net income $ 32,593 $ 4,479 $ 6,340 $ 43,412 Total assets $ 13,296,238 $ 1,081,723 $ 1,617,829 $ 15,995,790 (1) Includes merger related and repositioning expenses of $7.2 million and $2.6 million in the Banking Segment for the three months ended June 30, 2017 and 2016 , respectively. Banking Leasing Mortgage Banking Consolidated Six months ended June 30, 2017 Net interest income $ 267,431 $ 4,614 $ 19,992 $ 292,037 Provision for credit losses 12,417 275 741 13,433 Non-interest income 85,369 39,643 57,278 182,290 Non-interest expense (1) 224,208 27,280 69,736 321,224 Income tax expense 31,322 6,644 2,701 40,667 Net income $ 84,853 $ 10,058 $ 4,092 $ 99,003 Total assets $ 16,320,111 $ 1,275,386 $ 2,369,560 $ 19,965,057 Six months ended June 30, 2016 Net interest income $ 221,760 $ 4,834 $ 15,312 $ 241,906 Provision for credit losses 9,996 81 315 10,392 Non-interest income 71,687 34,912 67,094 173,693 Non-interest expense (1) 190,522 23,312 69,872 283,706 Income tax expense 27,700 6,388 4,887 38,975 Net income $ 65,229 $ 9,965 $ 7,332 $ 82,526 Total assets $ 13,296,238 $ 1,081,723 $ 1,617,829 $ 15,995,790 (1) Includes merger related and repositioning expenses of $7.4 million and $5.9 million in the Banking Segment for the six months ended June 30, 2017 and 2016 , respectively.

Preferred Stock

Preferred Stock	6 Months Ended
	Jun. 30, 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. During the fourth quarter of 2016, 400 shares of the Company Series B Preferred stock were converted into shares of the Company's common stock.

New Authoritative Accounting 26

New Authoritative Accounting Guidance (Policies)	6 Months Ended
	Jun. 30, 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 in 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. ASC Topic 718 "Compensation - Stock Compensation." New authoritative accounting guidance under ASC Topic 718 "Compensation - Stock Compensation" amends prior guidance by clarifying which changes to terms or conditions of a share-based payment award requires an entity to apply modification accounting. An entity should account for the effects of a modification unless the fair value, vesting conditions and classification of the modified award are the same as the original award. The new authoritative guidance will be effective for reporting periods after January 1, 2018 with early adoption permitted. This new authoritative guidance is not expected to have a significant impact on the Company's statements of operations or financial condition.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	6 Months Ended
	Jun. 30, 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 Six Months Ended June 30, June 30, 2017 2016 2017 2016 Distributed earnings allocated to common stock $ 17,829 $ 14,216 $ 33,960 $ 26,870 Undistributed earnings 26,637 29,196 65,043 55,656 Net income 44,466 43,412 99,003 82,526 Less: preferred stock dividends 2,002 2,000 4,005 4,000 Net income available to common stockholders for basic earnings per common share 42,464 41,412 94,998 78,526 Plus: preferred stock dividends on convertible preferred stock 2 — 5 — Less: earnings allocated to participating securities 1 2 2 4 Earnings allocated to common stockholders for diluted earnings per common share $ 42,465 $ 41,410 $ 95,001 $ 78,522 Weighted average shares outstanding for basic earnings per common share 83,842,963 73,475,258 83,753,195 73,402,995 Dilutive effect of: Stock options 554,314 326,339 595,415 281,948 Restricted shares and units 363,003 378,777 417,433 388,712 Convertible preferred stock 7,134 — 7,228 — Total dilutive effect of equity awards and convertible preferred stock 924,451 705,116 1,020,076 670,660 Weighted average shares outstanding for diluted earnings per common share 84,767,414 74,180,374 84,773,271 74,073,655 Basic earnings per common share $ 0.51 $ 0.56 $ 1.13 $ 1.07 Diluted earnings per common share 0.50 0.56 1.12 1.06

Business Combinations (Tables)

Business Combinations (Tables)	6 Months Ended
	Jun. 30, 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 preferred stock were converted into shares of 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 and six months ended June 30, 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 Six Months Ended June 30, June 30, 2016 2016 (in thousands) Total revenues (net interest income plus non-interest income) $ 245,037 $ 476,797 Net income 51,657 99,081

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2017 Available for Sale U.S. Government sponsored agencies and enterprises $ 23,141 $ 88 $ — $ 23,229 States and political subdivisions 367,385 20,494 (528 ) 387,351 Residential mortgage-backed securities 920,005 5,520 (7,920 ) 917,605 Commercial mortgage-backed securities 88,159 1,332 (165 ) 89,326 Corporate bonds 137,948 679 (71 ) 138,556 Equity securities 11,114 — (110 ) 11,004 Total Available for Sale 1,547,752 28,113 (8,794 ) 1,567,071 Held to Maturity States and political subdivisions 896,043 35,542 (376 ) 931,209 Residential mortgage-backed securities 126,869 2,966 — 129,835 Total Held to Maturity 1,022,912 38,508 (376 ) 1,061,044 Total $ 2,570,664 $ 66,621 $ (9,170 ) $ 2,628,115 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 June 30, 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 $ 18,891 $ (220 ) $ 1,885 $ (308 ) $ 20,776 $ (528 ) Residential mortgage-backed securities 528,088 (7,347 ) 46,755 (573 ) 574,843 (7,920 ) Commercial mortgage-backed securities 6,853 (44 ) 11,500 (121 ) 18,353 (165 ) Corporate bonds 10,350 (21 ) 9,944 (50 ) 20,294 (71 ) Equity securities 11,004 (110 ) — — 11,004 (110 ) Total Available for Sale 575,186 (7,742 ) 70,084 (1,052 ) 645,270 (8,794 ) Held to Maturity States and political subdivisions 55,170 (370 ) 2,076 (6 ) 57,246 (376 ) Total $ 630,356 $ (8,112 ) $ 72,160 $ (1,058 ) $ 702,516 $ (9,170 ) 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 Six Months Ended June 30, June 30, 2017 2016 2017 2016 Realized gains $ 137 $ 302 $ 374 $ 323 Realized losses — (33 ) (6 ) (54 ) Net gains $ 137 $ 269 $ 368 $ 269
Schedule of Remaining Contractual Maturities of Securities Included in the Securities Portfolio	The amortized cost and fair value of investment securities as of June 30, 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 $ 141,485 $ 142,145 Due after one year through five years 116,187 119,931 Due after five years through ten years 52,745 54,341 Due after ten years 218,057 232,719 Equity securities 11,114 11,004 Residential and commercial mortgage-backed securities 1,008,164 1,006,931 1,547,752 1,567,071 Held to maturity: Due in one year or less 49,998 50,083 Due after one year through five years 150,770 157,042 Due after five years through ten years 197,187 208,048 Due after ten years 498,088 516,036 Residential mortgage-backed securities 126,869 129,835 1,022,912 1,061,044 Total $ 2,570,664 $ 2,628,115

Loans (Tables)

Loans (Tables)	6 Months Ended
	Jun. 30, 2017
Receivables [Abstract]
Schedule of Composition of Loans	Loans consist of the following at (in thousands): June 30, December 31, Commercial loans $ 4,703,328 $ 4,346,506 Commercial loans collateralized by assignment of lease payments 2,076,911 2,002,976 Commercial real estate 3,882,754 3,788,016 Residential real estate 1,411,259 1,060,828 Construction real estate 449,116 518,562 Indirect vehicle 627,819 541,680 Home equity 238,952 266,377 Other consumer loans 74,925 80,781 Total loans, excluding purchased credit-impaired loans 13,465,064 12,605,726 Purchased credit-impaired loans 149,077 163,077 Total loans $ 13,614,141 $ 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 June 30, 2017 and December 31, 2016 (in thousands): Current 30-59 Days 60-89 Days Loans Past Due Total Total June 30, 2017 Commercial $ 4,688,835 $ 2,963 $ 6,288 $ 5,242 $ 14,493 $ 4,703,328 Commercial collateralized by assignment of lease payments 2,056,105 16,043 3,935 828 20,806 2,076,911 Commercial real estate: Healthcare 649,415 — — — — 649,415 Industrial 824,597 — 4,375 2,875 7,250 831,847 Multifamily 589,626 — — 570 570 590,196 Retail 490,205 2,348 — 1,061 3,409 493,614 Office 407,469 650 — 1,645 2,295 409,764 Other 904,560 2,543 224 591 3,358 907,918 Residential real estate 1,400,794 914 1,151 8,400 10,465 1,411,259 Construction real estate 449,116 — — — — 449,116 Indirect vehicle 624,214 2,656 709 240 3,605 627,819 Home equity 233,135 638 297 4,882 5,817 238,952 Other consumer 74,537 275 70 43 388 74,925 Total loans, excluding purchased credit-impaired loans 13,392,608 29,030 17,049 26,377 72,456 13,465,064 Purchased credit-impaired loans 83,158 6,095 3,625 56,199 65,919 149,077 Total loans $ 13,475,766 $ 35,125 $ 20,674 $ 82,576 $ 138,375 $ 13,614,141 Non-performing loan aging $ 24,876 $ 490 $ 767 $ 26,070 $ 27,327 $ 52,203 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 June 30, 2017 and December 31, 2016 (in thousands): June 30, 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 $ 7,126 $ — $ 11,222 $ 1,406 Commercial collateralized by assignment of lease payments 359 681 1,364 1,197 Commercial real estate: Healthcare — — — — Industrial 2,876 — 276 1,064 Multifamily 2,951 — 2,662 — Office 2,041 — 896 6,381 Retail 1,193 — 384 — Other 131 320 83 21 Residential real estate 17,229 147 16,538 235 Construction real estate — — — — Indirect vehicle 2,294 — 2,355 10 Home equity 14,808 — 13,187 — Other consumer 5 42 7 64 Total $ 51,013 $ 1,190 $ 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 June 30, 2017 and December 31, 2016 (in thousands): Pass Special Substandard Doubtful Total June 30, 2017 Commercial $ 4,485,246 $ 150,485 $ 67,597 $ — $ 4,703,328 Commercial collateralized by assignment of lease payments 2,057,116 10,446 9,349 — 2,076,911 Commercial real estate: Healthcare 608,517 25,640 15,258 — 649,415 Industrial 799,572 25,807 6,468 — 831,847 Multifamily 579,971 155 10,070 — 590,196 Retail 483,638 6,600 3,376 — 493,614 Office 402,731 2,296 4,737 — 409,764 Other 812,418 61,152 34,348 — 907,918 Construction real estate 448,584 532 — — 449,116 Total $ 10,677,793 $ 283,113 $ 151,203 $ — $ 11,112,109 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 June 30, 2017 and December 31, 2016 (in thousands): Performing Non-performing Total June 30, 2017 Residential real estate $ 1,393,883 $ 17,376 $ 1,411,259 Indirect vehicle 625,525 2,294 627,819 Home equity 224,144 14,808 238,952 Other consumer 74,878 47 74,925 Total $ 2,318,430 $ 34,525 $ 2,352,955 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 June 30, 2017 and December 31, 2016 (in thousands): June 30, 2017 Three Months Ended Six Months Ended Unpaid Recorded Partial Allowance for Average Interest Average Interest With no related allowance recorded: Commercial $ 3,501 $ 3,501 $ — $ — $ 2,218 $ 22 $ 4,875 $ 37 Commercial collateralized by assignment of lease payments 16 1 15 — 134 — 607 — Commercial real estate: Healthcare — — — — — — — — Industrial 2,167 1,871 296 — 1,803 8 1,854 8 Multifamily 1,824 1,824 — — 2,248 — 2,543 29 Retail 4,328 2,587 1,741 — 2,356 27 1,641 27 Office 1,865 1,865 — — 1,911 6 1,620 6 Other — — — — — — — — Residential real estate — — — — — — — — Construction real estate — — — — — — — — Indirect vehicle 250 144 106 — 305 5 282 10 Home equity 815 815 — — 815 — 704 — Other consumer — — — — — — — — With an allowance recorded: Commercial 7,666 7,666 — 1,076 8,428 26 8,519 173 Commercial collateralized by assignment of lease payments — — — — — — — — Commercial real estate: Healthcare — — — — — — — — Industrial 3,252 3,252 — 493 3,309 32 1,664 32 Multifamily 570 570 — 223 565 — 284 — Retail 1,851 1,851 — 8 1,855 28 2,713 28 Office — — — — — — — — Other — — — — — — — — Residential real estate 18,637 16,956 1,681 1,839 16,890 4 16,349 5 Construction real estate — — — — — — — — Indirect vehicle — — — — — — — — Home equity 30,074 28,204 1,870 2,940 28,197 16 28,023 27 Other consumer — — — — — — — — Total $ 76,816 $ 71,107 $ 5,709 $ 6,579 $ 71,034 $ 174 $ 71,678 $ 382 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 June 30, 2017 (dollars in thousands): June 30, 2017 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Commercial 5 $ 2,491 $ 2,491 $ 373 Commercial real estate Industrial 2 2,787 2,787 — Office 1 549 549 — Other 1 147 147 — Residential real estate 3 493 493 86 Home equity 2 46 46 3 Total 14 $ 6,513 $ 6,513 $ 462 Non-Performing: Commercial 2 $ 676 $ 676 $ — Commercial real estate: Multifamily 3 290 290 — Retail 1 906 906 — Residential real estate 8 1,122 1,122 289 Indirect vehicle 8 77 77 25 Home equity 2 593 593 57 Total 24 $ 3,664 $ 3,664 $ 371 The following table presents loans that were restructured during the six months ended June 30, 2017 (dollars in thousands): June 30, 2017 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Commercial 5 $ 2,491 $ 2,491 $ 373 Commercial real estate Industrial 2 2,787 2,787 — Office 1 549 549 — Other 1 147 147 — Residential real estate 6 902 902 135 Home equity 3 78 78 6 Total 18 $ 6,954 $ 6,954 $ 514 Non-Performing: Commercial 2 $ 676 $ 676 $ — Commercial real estate: Multifamily 3 290 290 — Retail 1 906 906 — Residential real estate 17 2,380 2,380 443 Indirect vehicle 11 97 97 29 Home equity 3 593 593 57 Total 37 $ 4,942 $ 4,942 $ 529 The following table presents loans that were restructured during the three months ended June 30, 2016 (dollars in thousands): June 30, 2016 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Commercial 1 $ 1,870 $ 1,870 $ 412 Total 1 $ 1,870 $ 1,870 $ 412 Non-Performing: Commercial 4 $ 8,607 $ 8,607 $ 3,500 Residential real estate 1 83 83 — Indirect vehicle 8 69 69 21 Home equity 14 2,030 2,030 15 Total 27 $ 10,789 $ 10,789 $ 3,536 The following table presents loans that were restructured during the six months ended June 30, 2016 (dollars in thousands): June 30, 2016 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Commercial 1 $ 1,870 $ 1,870 $ 412 Home equity 2 410 410 — Total 3 $ 2,280 $ 2,280 $ 412 Non-Performing: Commercial 4 $ 8,607 $ 8,607 $ 3,500 Residential real estate 2 155 155 — Indirect vehicle 18 149 149 43 Home equity 23 3,111 3,111 66 Total 47 $ 12,022 $ 12,022 $ 3,609
Troubled Debt Restructuring Activity Rollforward	The following table presents the troubled debt restructurings activity during the six months ended June 30, 2017 (in thousands): Performing Non-performing Beginning balance $ 32,687 $ 27,068 Additions 6,954 4,942 Charge-offs — (383 ) Principal payments, net (631 ) (4,013 ) Removals (10,630 ) (2,389 ) Transfer to other real estate owned — (289 ) Transfers in 1,448 170 Transfers out (170 ) (1,448 ) Ending balance $ 29,658 $ 23,658
Type of Financing Receivable Modifications and Restructuring	The following table presents the type of modification for loans that have been restructured during the six months ended June 30, 2017 (in thousands): June 30, 2017 Extended Maturity, Delay in Amortization Extended Payments or and Reduction Maturity and/or Reduction of of Interest Rate Amortization Interest Rate Total Commercial $ — $ 3,167 $ — $ 3,167 Commercial collateralized by assignment of lease payments — — — — Commercial real estate: Healthcare — — — — Industrial — 2,787 — 2,787 Multifamily — 290 — 290 Retail — 906 — 906 Office — 549 — 549 Other — 147 — 147 Residential real estate 1,110 1,589 583 3,282 Construction real estate — — — — Indirect vehicle — — 97 97 Home equity — 1 670 671 Other consumer — — — — Total $ 1,110 $ 9,436 $ 1,350 $ 11,896
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 June 30, 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 June 30, 2017 Allowance for credit losses: Three Months Ended Beginning balance $ 40,690 $ 12,143 $ 58,220 $ 8,131 $ 14,859 $ 3,624 $ 5,312 $ 1,191 $ 2,328 $ 146,498 Charge-offs 700 — 262 270 — 930 261 498 — 2,921 Recoveries 1,339 249 362 58 47 565 292 109 — 3,021 Provision 2,454 373 4,927 330 357 704 206 412 (64 ) 9,699 Ending balance $ 43,783 $ 12,765 $ 63,247 $ 8,249 $ 15,263 $ 3,963 $ 5,549 $ 1,214 $ 2,264 $ 156,297 Six 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 868 — 1,347 360 — 2,341 434 944 — 6,294 Recoveries 2,849 712 880 586 159 1,217 575 338 — 7,316 Provision (2,859 ) (185 ) 11,907 2,052 346 1,666 (61 ) 779 (212 ) 13,433 Ending balance $ 43,783 $ 12,765 $ 63,247 $ 8,249 $ 15,263 $ 3,963 $ 5,549 $ 1,214 $ 2,264 $ 156,297 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 1,076 $ — $ 724 $ 1,839 $ — $ — $ 2,940 $ — $ 516 $ 7,095 Collectively evaluated for impairment 42,619 12,765 62,115 6,410 15,227 3,963 2,609 1,214 1,748 148,670 Acquired and accounted for under ASC 310-30 (1) 88 — 408 — 36 — — — — 532 Total ending allowance balance $ 43,783 $ 12,765 $ 63,247 $ 8,249 $ 15,263 $ 3,963 $ 5,549 $ 1,214 $ 2,264 $ 156,297 Loans: Individually evaluated for impairment $ 11,167 $ 1 $ 13,820 $ 16,956 $ — $ 144 $ 29,019 $ — $ — $ 71,107 Collectively evaluated for impairment 4,692,161 2,076,910 3,868,934 1,394,303 449,116 627,675 209,933 74,925 — 13,393,957 Acquired and accounted for under ASC 310-30 (1) 17,797 — 38,859 73,872 5,201 — 11,558 1,790 — 149,077 Total ending loans balance $ 4,721,125 $ 2,076,911 $ 3,921,613 $ 1,485,131 $ 454,317 $ 627,819 $ 250,510 $ 76,715 $ — $ 13,614,141 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 June 30, 2016 Allowance for credit losses: Three Months Ended Beginning balance $ 46,962 $ 10,505 $ 46,785 $ 5,596 $ 14,614 $ 2,732 $ 5,022 $ 2,277 $ 3,239 $ 137,732 Charge-offs 72 2,347 1,720 476 144 651 619 395 — 6,424 Recoveries 952 467 1,843 82 17 501 193 141 — 4,196 Provision 2,455 1,924 (868 ) (402 ) (257 ) 518 (397 ) 376 (520 ) 2,829 Ending balance $ 50,297 $ 10,549 $ 46,040 $ 4,800 $ 14,230 $ 3,100 $ 4,199 $ 2,399 $ 2,719 $ 138,333 Six 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 785 2,921 2,072 844 144 1,582 857 807 — 10,012 Recoveries 1,332 517 2,437 106 44 964 511 534 — 6,445 Provision 10,434 2,519 200 (196 ) (783 ) 1,300 (2,829 ) 396 (649 ) 10,392 Ending balance $ 50,297 $ 10,549 $ 46,040 $ 4,800 $ 14,230 $ 3,100 $ 4,199 $ 2,399 $ 2,719 $ 138,333 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 11,388 $ 391 $ 426 $ 2,446 $ — $ — $ 2,719 $ — $ 731 $ 18,101 Collectively evaluated for impairment 38,762 10,158 45,084 2,354 14,194 3,100 1,480 2,399 1,988 119,519 Acquired and accounted for under ASC 310-30 (1) 147 — 530 — 36 — — — — 713 Total ending allowance balance $ 50,297 $ 10,549 $ 46,040 $ 4,800 $ 14,230 $ 3,100 $ 4,199 $ 2,399 $ 2,719 $ 138,333 Loans: Individually evaluated for impairment $ 31,652 $ 1,170 $ 7,962 $ 13,049 $ — $ 146 $ 29,419 $ — $ — $ 83,398 Collectively evaluated for impairment 3,529,848 1,793,295 2,819,758 740,658 357,807 491,334 169,203 75,775 — 9,977,678 Acquired and accounted for under ASC 310-30 (1) 21,745 — 26,199 59,538 13,795 — 13,091 2,443 — 136,811 Total ending loans balance $ 3,583,245 $ 1,794,465 $ 2,853,919 $ 813,245 $ 371,602 $ 491,480 $ 211,713 $ 78,218 $ — $ 10,197,887 (1) Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 “Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality.”
Changes in the Accretable Yield for Purchased Credit-Impaired Loans	Changes in the accretable yield for loans acquired and accounted for under ASC 310-30 were as follows for the three and six months ended June 30, 2017 and 2016 (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Balance at beginning of period $ 14,911 $ 13,970 $ 16,050 $ 12,596 Purchases — — 43 — Accretion (2,831 ) (2,419 ) (5,019 ) (4,629 ) Other (1) 606 1,609 1,612 5,193 Balance at end of period $ 12,686 $ 13,160 $ 12,686 $ 13,160 (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): June 30, 2017 Purchased Purchased Non-Credit-Impaired Total Covered loans (1) : Consumer related $ 16,477 $ — $ 16,477 Non-covered loans: Commercial loans 17,797 482,140 499,937 Commercial loans collateralized by assignment of lease payments — 55,661 55,661 Commercial real estate 38,859 1,036,159 1,075,018 Construction real estate 5,201 12,840 18,041 Consumer related 5,059 313,767 318,826 Total non-covered loans 66,916 1,900,567 1,967,483 Total acquired $ 83,393 $ 1,900,567 $ 1,983,960

Goodwill and Intangibles (Table

Goodwill and Intangibles (Tables)	6 Months Ended
	Jun. 30, 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 six months ended June 30, 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 during the first quarter of 2017.
Changes in the Carrying Amount of Core Deposit and Client Relationship Intangibles	The following table presents the changes during the six months ended June 30, 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 June 30, 2017 (in thousands): June 30, 2017 Balance at beginning of period $ 62,959 Amortization expense (4,176 ) Balance at end of period $ 58,783 Gross carrying amount $ 112,820 Accumulated amortization (54,037 ) Net book value $ 58,783
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 $ 4,017 2018 7,451 2019 5,674 2020 5,022 2021 4,790 Thereafter 31,829 $ 58,783

Deposits (Tables)

Deposits (Tables)	6 Months Ended
	Jun. 30, 2017
Banking and Thrift [Abstract]
Schedule of Composition of Deposits	The composition of deposits was as follows as of June 30, 2017 and December 31, 2016 (in thousands): June 30, December 31, 2017 2016 Demand deposit accounts, non-interest bearing $ 6,388,292 $ 6,408,169 NOW, money market and interest bearing deposits 4,600,506 4,543,004 Savings accounts 1,109,155 1,135,992 Certificates of deposit, $250,000 or more 1,221,043 1,144,121 Other certificates of deposit 942,823 879,162 Total $ 14,261,819 $ 14,110,448

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Summary of Short-Term Borrowings	Short-term borrowings were as follows as of June 30, 2017 and December 31, 2016 (dollars in thousands): June 30, 2017 December 31, 2016 Weighted Average Interest Rate Amount Weighted Average Interest Rate Amount Customer repurchase agreements 0.22 % $ 203,358 0.22 % $ 237,538 Federal Home Loan Bank advances 1.18 1,650,000 0.63 1,275,000 Federal funds purchased 1.32 140,000 0.80 46,750 Line of credit — — 2.52 10,000 Total 1.09 % $ 1,993,358 0.59 % $ 1,569,288

Long-Term Borrowings (Tables)

Long-Term Borrowings (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Schedule of Long-term Borrowings	Long-term borrowings were as follows as of June 30, 2017 and December 31, 2016 (dollars in thousands): June 30, 2017 December 31, 2016 Weighted Average Interest Rate Amount Weighted Average Interest Rate Amount Federal Home Loan Bank advances 1.48 % $ 231,417 0.85 % $ 230,865 Notes payable 3.99 86,743 4.18 66,925 Term note 2.97 12,000 2.52 14,000 Total 2.19 % $ 330,160 1.64 % $ 311,790

Junior Subordinated Notes Iss35

Junior Subordinated Notes Issued to Capital Trusts (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 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 $6.6 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)	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule of Outstanding Financial Instruments, Contractual Amounts of Off-Balance Sheet Credit Risk	At June 30, 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 June 30, 2017 December 31, 2016 Commitments to extend credit: Home equity lines $ 224,881 $ 235,279 Other commitments 3,862,382 3,679,259 Letters of credit: Standby 152,646 185,386 Commercial 488 1,766

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 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) June 30, 2017 Financial assets Securities available for sale: U.S Government sponsored agencies and enterprises $ 23,229 $ — $ 23,229 $ — States and political subdivisions 387,351 — 386,978 373 Residential mortgage-backed securities 917,605 — 917,516 89 Commercial mortgage-backed securities 89,326 — 89,326 — Corporate bonds 138,556 — 138,556 — Equity securities 11,004 11,004 — — Loans held for sale 718,916 — 718,916 — Loans 14,867 — 14,867 — Mortgage servicing rights 249,688 — — 249,688 Assets held in trust for deferred compensation 19,202 19,202 — — Derivative financial instruments 37,948 3,055 32,194 2,699 Financial liabilities Other liabilities (1) 19,202 19,202 — — Derivative financial instruments 40,131 1,870 38,261 — 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 June 30, 2017 Valuation Technique Unobservable Input Range (in thousands) States and political subdivisions $ 373 Discounted cash flows Credit assumption 50% Loss Residential mortgage-backed securities 89 Discounted cash flows Constant pre-payment rates (CPR) 1% - 3% Mortgage servicing rights 249,688 Discounted cash flows CPR 6.8% - 8.6% Discount rate 9.53 - 11.05 Maturity (months) 322 - 357 Delinquencies 1.97 - 4.61 Costs to service $ 66 - $ 226 Additive delinquent costs to service $ 175 - $ 1,000 Derivative financial instruments (mortgage 2,699 Sales cash flows Expected closing ratio 70% - 95% interest rate lock commitments) Expected delivery price 98.78 bps - 108.44 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 June 30, 2017 Technique Input Range (in thousands) Impaired loans $ 53,385 Appraisal of collateral Appraisal adjustments 5% - 10% Foreclosed assets 16,396 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 June 30, 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) June 30, 2017 Weighted average CPR 7.70 % Impact on fair value of 10% adverse change $ (8,174 ) Impact on fair value of 20% adverse change (15,901 ) Weighted average discount rate 9.81 % Impact on fair value of 10% adverse change $ (10,565 ) Impact on fair value of 20% adverse change (20,309 ) Weighted average delinquency rate 4.40 % Impact on fair value of 10% adverse change $ (2,091 ) Impact on fair value of 20% adverse change (3,914 ) Weighted average costs to service $ 89 Impact on fair value of 10% adverse change (4,665 ) Impact on fair value of 20% adverse change (9,330 )
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): Six Months Ended June 30, 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 — — 786 2,961 — — Originations — — 27,568 25,043 — — Included in earnings — — (16,677 ) (61,197 ) (461 ) 8,852 Principal payments (82 ) (117 ) — — — — Sales — — — — — — Balance, ending of period $ 462 $ 656 $ 249,688 $ 134,969 $ 2,699 $ 12,674
Assets Measured at Fair Value on a Nonrecurring Basis	Assets measured at fair value on a nonrecurring basis as of June 30, 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) June 30, 2017 Financial assets: Impaired loans $ 53,385 $ — $ — $ 53,385 Non-financial assets: Foreclosed assets 16,396 — — 16,396 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): June 30, 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 $ 348,550 $ 348,550 $ 348,550 $ — $ — Interest earning deposits with banks 115,707 115,707 115,707 — — Investment securities available for sale 1,567,071 1,567,071 11,004 1,555,605 462 Investment securities held to maturity 1,022,912 1,061,044 — 1,061,044 — Non-marketable securities - FHLB and FRB stock 160,204 160,204 — — 160,204 Loans held for sale 718,916 718,916 — 718,916 — Loans, net 13,460,108 13,736,459 — 14,867 13,721,592 Accrued interest receivable 59,675 59,675 59,675 — — Derivative financial instruments 37,948 37,948 3,055 32,194 2,699 Financial Liabilities: Non-interest bearing deposits $ 6,388,292 $ 6,388,292 $ 6,388,292 $ — $ — Interest bearing deposits 7,873,527 7,868,383 — — 7,868,383 Short-term borrowings 1,993,358 1,993,656 — — 1,993,656 Long-term borrowings 330,160 335,643 — — 335,643 Junior subordinated notes issued to capital trusts 211,085 165,727 — — 165,727 Accrued interest payable 5,495 5,495 5,495 — — Derivative financial instruments 40,131 40,131 1,870 38,261 — 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)	6 Months Ended
	Jun. 30, 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 Six Months Ended June 30, June 30, 2017 2016 2017 2016 Total compensation expense for share-based payment plans during the period $ 4,443 $ 4,284 $ 8,924 $ 8,335 Amount of related income tax benefit recognized in income 1,916 1,671 6,338 3,254
Summary of Changes in Stock Options	The following table summarizes changes in stock options for the six months ended June 30, 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 159,540 45.54 Exercised (211,770 ) 27.04 Expired — — Forfeited or cancelled (9,594 ) 31.32 Options outstanding as of June 30, 2017 1,878,581 $ 29.01 5.40 $ 28,501 Options exercisable as of June 30, 2017 1,238,014 $ 26.84 3.88 $ 21,318
Assumptions Used for Options Granted	The following assumptions were used for options granted during the six months ended June 30, 2017 : June 30, 2017 Risk-free interest rate 2.18 % Expected volatility of Company’s stock 22.66 % Expected dividend yield 1.67 % Expected life of options 5.9 years Weighted average fair value per option of options granted during the year $ 9.43
Summary of Changes in Restricted Shares and Units	The following is a summary of changes in restricted shares and units for the six months ended June 30, 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 379,335 45.77 Vested (331,875 ) 31.11 Forfeited or cancelled (15,293 ) 33.42 Shares and units outstanding at June 30, 2017 1,030,974 36.55

Derivative Financial Instrume39

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Derivative Financial Instruments	The Company’s derivative financial instruments are summarized below as of June 30, 2017 and December 31, 2016 (in thousands): Asset Derivatives Liability Derivatives June 30, 2017 December 31, 2016 June 30, 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) $ — $ — $ — $ — $ 83 $ (2 ) $ 107 $ (4 ) Stand-alone derivative instruments: (2) Interest rate swap contracts 1,407,132 23,773 1,310,057 25,471 1,407,132 (23,773 ) 1,310,057 (25,471 ) Interest rate options contracts 322,810 1,369 217,546 881 322,810 (1,369 ) 217,546 (881 ) Foreign exchange contracts 37,701 2,163 40,641 4,429 37,254 (1,991 ) 40,505 (4,265 ) Spot foreign exchange contracts 7,137 89 1,691 12 6,030 (38 ) 660 (5 ) Mortgage related derivatives: Interest rate swap contracts 778,000 4,800 383,000 2,946 798,000 (11,088 ) 1,458,000 (31,212 ) Treasury futures contracts 27,500 96 15,500 41 35,000 (288 ) — — TBA mortgage securities — — — — 110,000 (940 ) 55,000 (132 ) Forward loan sale commitments 742,000 2,959 585,000 7,646 209,000 (642 ) 386,000 (1,915 ) Interest rate lock commitments 603,018 2,699 543,901 3,160 — — — — Total stand-alone derivative instruments 3,925,298 37,948 3,097,336 44,586 2,925,226 (40,129 ) 3,467,768 (63,881 ) Total $ 3,925,298 $ 37,948 $ 3,097,336 $ 44,586 $ 2,925,309 $ (40,131 ) $ 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 Six Months Ended June 30, June 30, 2017 2016 2017 2016 Derivative instruments designated as hedges of fair value: Interest rate swap contracts $ 1 $ 1 $ 2 $ 2 Stand-alone derivative instruments: Interest rate swap contracts 1,624 (1 ) 3,473 2,337 Interest rate options contracts — (1 ) — 35 Foreign exchange contracts 197 371 260 499 Spot foreign exchange contracts 729 (2 ) 1,407 301 Mortgage related derivatives (301 ) 16,060 (10,442 ) 39,771 Total stand-alone derivative instruments 2,249 16,427 (5,302 ) 42,943 Total $ 2,250 $ 16,428 $ (5,300 ) $ 42,945
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 June 30, 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 $ 7,291 $ — $ 7,291 $ 17,950 $ — $ 17,950 Foreign exchange contracts 995 — 995 1,531 — 1,531 Mortgage related derivatives 7,855 — 7,855 12,958 — 12,958 Total derivatives 16,141 — 16,141 32,439 — 32,439 Repurchase agreements — — — 203,358 — 203,358 Total $ 16,141 $ — $ 16,141 $ 235,797 $ — $ 235,797 Financial Assets Financial Liabilities Net Amount Recognized Financial Instruments Collateral Net Amount Net Amount Recognized Financial Instruments Collateral Net Amount Derivatives: Counterparty A $ 2,807 $ (2,807 ) $ — $ — $ 9,218 $ (2,807 ) $ (6,411 ) $ — Counterparty B 2,206 (2,206 ) — — 7,759 (2,206 ) (5,553 ) — Counterparty C 247 (247 ) — — 2,679 (247 ) (2,432 ) — Other counterparties 10,881 (8,529 ) — 2,352 12,783 (8,529 ) (4,237 ) 17 Total derivatives 16,141 (13,789 ) — 2,352 32,439 (13,789 ) (18,633 ) 17 Repurchase agreements — — — — 203,358 — (203,358 ) — Total $ 16,141 $ (13,789 ) $ — $ 2,352 $ 235,797 $ (13,789 ) $ (221,991 ) $ 17 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)	6 Months Ended
	Jun. 30, 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 June 30, 2017 Net interest income $ 135,982 $ 2,345 $ 10,667 $ 148,994 Provision for credit losses 8,890 410 399 9,699 Non-interest income 42,838 18,180 29,499 90,517 Non-interest expense (1) 116,369 13,436 35,754 165,559 Income tax expense 15,662 2,525 1,600 19,787 Net income $ 37,899 $ 4,154 $ 2,413 $ 44,466 Total assets $ 16,320,111 $ 1,275,386 $ 2,369,560 $ 19,965,057 Three months ended June 30, 2016 Net interest income $ 112,152 $ 2,411 $ 8,039 $ 122,602 Provision for credit losses 2,995 (356 ) 190 2,829 Non-interest income 36,668 15,717 39,615 92,000 Non-interest expense (1) 99,882 11,126 36,898 147,906 Income tax expense 13,350 2,879 4,226 20,455 Net income $ 32,593 $ 4,479 $ 6,340 $ 43,412 Total assets $ 13,296,238 $ 1,081,723 $ 1,617,829 $ 15,995,790 (1) Includes merger related and repositioning expenses of $7.2 million and $2.6 million in the Banking Segment for the three months ended June 30, 2017 and 2016 , respectively. Banking Leasing Mortgage Banking Consolidated Six months ended June 30, 2017 Net interest income $ 267,431 $ 4,614 $ 19,992 $ 292,037 Provision for credit losses 12,417 275 741 13,433 Non-interest income 85,369 39,643 57,278 182,290 Non-interest expense (1) 224,208 27,280 69,736 321,224 Income tax expense 31,322 6,644 2,701 40,667 Net income $ 84,853 $ 10,058 $ 4,092 $ 99,003 Total assets $ 16,320,111 $ 1,275,386 $ 2,369,560 $ 19,965,057 Six months ended June 30, 2016 Net interest income $ 221,760 $ 4,834 $ 15,312 $ 241,906 Provision for credit losses 9,996 81 315 10,392 Non-interest income 71,687 34,912 67,094 173,693 Non-interest expense (1) 190,522 23,312 69,872 283,706 Income tax expense 27,700 6,388 4,887 38,975 Net income $ 65,229 $ 9,965 $ 7,332 $ 82,526 Total assets $ 13,296,238 $ 1,081,723 $ 1,617,829 $ 15,995,790 (1) Includes merger related and repositioning expenses of $7.4 million and $5.9 million in the Banking Segment for the six months ended June 30, 2017 and 2016 , respectively.

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 44,466	$ 43,412	$ 99,003	$ 82,526
Less: preferred stock dividends	2,002	2,000	4,005	4,000
Net income available to common stockholders	42,464	41,412	94,998	78,526
Plus: preferred stock dividends on convertible preferred stock	2	0	5	0
Earnings allocated to common stockholders for diluted earnings per common share	$ 42,465	$ 41,410	$ 95,001	$ 78,522
Weighted average shares outstanding for basic earnings per common share (in shares)	83,842,963	73,475,258	83,753,195	73,402,995
Dilutive effect of convertible preferred stock (in shares)	7,134	0	7,228	0
Total dilutive effect of equity awards and convertible preferred stock (in shares)	924,451	705,116	1,020,076	670,660
Weighted average shares outstanding for diluted earnings per common share (in shares)	84,767,414	74,180,374	84,773,271	74,073,655
Basic earnings per common share (in dollars per share)	$ 0.51	$ 0.56	$ 1.13	$ 1.07
Diluted earnings per common share (in dollars per share)	$ 0.50	$ 0.56	$ 1.12	$ 1.06
Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Distributed earnings allocated to common stock	$ 17,829	$ 14,216	$ 33,960	$ 26,870
Undistributed earnings	26,637	29,196	65,043	55,656
Net income	44,466	43,412	99,003	82,526
Net income available to common stockholders	$ 42,464	$ 41,412	$ 94,998	$ 78,526
Weighted average shares outstanding for basic earnings per common share (in shares)	83,842,963	73,475,258	83,753,195	73,402,995
Weighted average shares outstanding for diluted earnings per common share (in shares)	84,767,414	74,180,374	84,773,271	74,073,655
Participating Securities
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Less: earnings allocated to participating securities	$ 1	$ 2	$ 2	$ 4
Stock options
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of stock options and restricted shares/units (in shares)	554,314	326,339	595,415	281,948
Restricted shares and units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of stock options and restricted shares/units (in shares)	363,003	378,777	417,433	388,712

Business Combinations (Details

Business Combinations (Details 1) - USD ($)	Aug. 24, 2016	Nov. 20, 2015	Mar. 31, 2017	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill				$ 999,925,000		$ 1,001,038,000
Accretable discount on loans				$ 13,858,000	$ 14,961,000
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
Common Stock | American Chartered Bancorp, Inc.
Business Acquisition [Line Items]
Market value of common stock and Series B preferred stock	$ 382,800,000
Stock issued (in shares)	9,700,000
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%
Series B Preferred Stock | American Chartered Bancorp, Inc.
Business Acquisition [Line Items]
Preferred stock, dividend rate (percent)	8.00%	8.00%
Number of securities called by each warrant (in shares)	1

Business Combinations (Detail43

Business Combinations (Details 2) - USD ($) $ / shares in Units, $ in Thousands		Aug. 24, 2016	Jun. 30, 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 preferred stock were converted into shares of 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) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
Business Combinations [Abstract]
Total revenues (net interest income plus non-interest income	$ 245,037	$ 476,797
Net income	$ 51,657	$ 99,081

Investment Securities (Details)

Investment Securities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Available for Sale
Amortized Cost	$ 1,547,752	$ 1,684,665
Gross Unrealized Gains	28,113	24,205
Gross Unrealized Losses	(8,794)	(12,675)
Fair Value	1,567,071	1,696,195
Held to Maturity
Amortized Cost	1,022,912	1,069,750
Gross Unrealized Gains	38,508	27,029
Gross Unrealized Losses	(376)	(3,039)
Fair Value	1,061,044	1,093,740
Total Available for Sale and Held to Maturity Investment Securities
Amortized Cost	2,570,664	2,754,415
Gross Unrealized Gains	66,621	51,234
Gross Unrealized Losses	(9,170)	(15,714)
Fair Value	2,628,115	2,789,935
U.S. Government sponsored agencies and enterprises
Available for Sale
Amortized Cost	23,141	23,267
Gross Unrealized Gains	88	148
Gross Unrealized Losses	0	0
Fair Value	23,229	23,415
States and political subdivisions
Available for Sale
Amortized Cost	367,385	376,541
Gross Unrealized Gains	20,494	15,669
Gross Unrealized Losses	(528)	(845)
Fair Value	387,351	391,365
Held to Maturity
Amortized Cost	896,043	910,608
Gross Unrealized Gains	35,542	21,609
Gross Unrealized Losses	(376)	(3,039)
Fair Value	$ 931,209	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	28.00%
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	20.00%
Residential mortgage-backed securities
Available for Sale
Amortized Cost	$ 920,005	988,744
Gross Unrealized Gains	5,520	5,741
Gross Unrealized Losses	(7,920)	(10,801)
Fair Value	917,605	983,684
Held to Maturity
Amortized Cost	126,869	159,142
Gross Unrealized Gains	2,966	5,420
Gross Unrealized Losses	0	0
Fair Value	129,835	164,562
Commercial mortgage-backed securities
Available for Sale
Amortized Cost	88,159	91,949
Gross Unrealized Gains	1,332	1,221
Gross Unrealized Losses	(165)	(162)
Fair Value	89,326	93,008
Corporate bonds
Available for Sale
Amortized Cost	137,948	193,164
Gross Unrealized Gains	679	1,426
Gross Unrealized Losses	(71)	(695)
Fair Value	138,556	193,895
Equity securities
Available for Sale
Amortized Cost	11,114	11,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(110)	(172)
Fair Value	$ 11,004	$ 10,828

Investment Securities (Details

Investment Securities (Details 2) $ in Thousands	Jun. 30, 2017USD ($)Security_Position	Dec. 31, 2016USD ($)Security_Position
Available for Sale
Less Than 12 Months, Fair Value	$ 575,186	$ 705,456
Less Than 12 Months, Unrealized Losses	(7,742)	(11,314)
12 Months or More, Fair Value	70,084	86,690
12 Months or More, Unrealized Losses	(1,052)	(1,361)
Total Fair Value	645,270	792,146
Total Unrealized Losses	(8,794)	(12,675)
Total
Less Than 12 Months, Fair Value	630,356	949,024
Less Than 12 Months, Unrealized Losses	(8,112)	(14,313)
12 Months or More, Fair Value	72,160	89,678
12 Months or More, Unrealized Losses	(1,058)	(1,401)
Total Fair Value	702,516	1,038,702
Total Unrealized Losses	$ (9,170)	$ (15,714)
Number of security positions in the investment portfolio in an unrealized loss position | Security_Position	457	615
States and political subdivisions
Available for Sale
Less Than 12 Months, Fair Value	$ 18,891	$ 42,806
Less Than 12 Months, Unrealized Losses	(220)	(845)
12 Months or More, Fair Value	1,885	0
12 Months or More, Unrealized Losses	(308)	0
Total Fair Value	20,776	42,806
Total Unrealized Losses	(528)	(845)
Held to Maturity
Less Than 12 Months, Fair Value	55,170	243,568
Less Than 12 Months, Unrealized Losses	(370)	(2,999)
12 Months or More, Fair Value	2,076	2,988
12 Months or More, Unrealized Losses	(6)	(40)
Total Fair Value	57,246	246,556
Total Unrealized Losses	(376)	(3,039)
Residential mortgage-backed securities
Available for Sale
Less Than 12 Months, Fair Value	528,088	623,732
Less Than 12 Months, Unrealized Losses	(7,347)	(10,084)
12 Months or More, Fair Value	46,755	54,990
12 Months or More, Unrealized Losses	(573)	(717)
Total Fair Value	574,843	678,722
Total Unrealized Losses	(7,920)	(10,801)
Commercial mortgage-backed securities
Available for Sale
Less Than 12 Months, Fair Value	6,853	7,062
Less Than 12 Months, Unrealized Losses	(44)	(9)
12 Months or More, Fair Value	11,500	11,612
12 Months or More, Unrealized Losses	(121)	(153)
Total Fair Value	18,353	18,674
Total Unrealized Losses	(165)	(162)
Corporate bonds
Available for Sale
Less Than 12 Months, Fair Value	10,350	21,028
Less Than 12 Months, Unrealized Losses	(21)	(204)
12 Months or More, Fair Value	9,944	20,088
12 Months or More, Unrealized Losses	(50)	(491)
Total Fair Value	20,294	41,116
Total Unrealized Losses	(71)	(695)
Equity securities
Available for Sale
Less Than 12 Months, Fair Value	11,004	10,828
Less Than 12 Months, Unrealized Losses	(110)	(172)
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Total Fair Value	11,004	10,828
Total Unrealized Losses	$ (110)	$ (172)

Investment Securities (Detail48

Investment Securities (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Amortized cost and fair value of investment securities by contractual maturity
Realized gains	$ 137	$ 302	$ 374	$ 323
Realized losses	0	(33)	(6)	(54)
Net gains	137	$ 269	368	$ 269
Amortized Cost, Available for sale
Due in one year or less	141,485		141,485
Due after one year through five years	116,187		116,187
Due after five years through ten years	52,745		52,745
Due after ten years	218,057		218,057
Amortized Cost	1,547,752		1,547,752		$ 1,684,665
Fair Value, Available for sale
Due in one year or less	142,145		142,145
Due after one year through five years	119,931		119,931
Due after five years through ten years	54,341		54,341
Due after ten years	232,719		232,719
Fair Value	1,567,071		1,567,071		1,696,195
Amortized Cost, Held to maturity
Due in one year or less	49,998		49,998
Due after one year through five years	150,770		150,770
Due after five years through ten years	197,187		197,187
Due after ten years	498,088		498,088
Investment securities held to maturity	1,022,912		1,022,912		1,069,750
Fair value, Held to maturity
Due in one year or less	50,083		50,083
Due after one year through five years	157,042		157,042
Due after five years through ten years	208,048		208,048
Due after ten years	516,036		516,036
Fair Value	1,061,044		1,061,044		1,093,740
Total Available for Sale and Held to Maturity Investment Securities
Amortized Cost	2,570,664		2,570,664		2,754,415
Fair Value	2,628,115		2,628,115		2,789,935
Pledged financial instruments, not separately reported, securities	832,900		832,900		1,000,000
Pledged financial instruments, not separately reported, securities required to be pledged	725,700		725,700		756,500
Equity securities
Amortized Cost, Available for sale
Amortized Cost	11,114		11,114		11,000
Fair Value, Available for sale
Fair Value	11,004		11,004		10,828
Residential and commercial mortgage-backed securities
Amortized Cost, Available for sale
Amortized Cost	1,008,164		1,008,164
Fair Value, Available for sale
Fair Value	1,006,931		1,006,931
Residential mortgage-backed securities
Amortized Cost, Available for sale
Amortized Cost	920,005		920,005		988,744
Fair Value, Available for sale
Fair Value	917,605		917,605		983,684
Amortized Cost, Held to maturity
Investment securities held to maturity	126,869		126,869		159,142
Fair value, Held to maturity
Fair Value	$ 129,835		$ 129,835		$ 164,562

Loans (Details)

Loans (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)category	Dec. 31, 2016USD ($)	Jun. 30, 2016USD ($)
Loans
Total loans, excluding purchased credit-impaired loans	$ 13,465,064	$ 12,605,726
Purchased credit-impaired loans	149,077	163,077
Total loans	$ 13,614,141	12,768,803	$ 10,197,887
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	$ 5,400,000	5,500,000
Loans required to be pledged as collateral for long-term Federal Home Loan Bank advances	4,000,000	3,200,000
Commercial Portfolio Segment
Loans
Total loans, excluding purchased credit-impaired loans	4,703,328	4,346,506
Total loans	4,721,125		3,583,245
Commercial Portfolio Segment | Collateralized
Loans
Total loans, excluding purchased credit-impaired loans	2,076,911	2,002,976
Total loans	2,076,911		1,794,465
Commercial Real Estate Portfolio Segment | Commercial real estate
Loans
Total loans, excluding purchased credit-impaired loans	3,882,754	3,788,016
Total loans	3,921,613		2,853,919
Commercial Real Estate Portfolio Segment | Construction real estate
Loans
Total loans, excluding purchased credit-impaired loans	449,116	518,562
Total loans	454,317		371,602
Commercial Real Estate Portfolio Segment | Other
Loans
Total loans, excluding purchased credit-impaired loans	907,918	903,621
Consumer Portfolio Segment | Commercial real estate
Loans
Total loans, excluding purchased credit-impaired loans	1,411,259	1,060,828
Consumer Portfolio Segment | Indirect vehicle
Loans
Total loans, excluding purchased credit-impaired loans	627,819	541,680
Total loans	627,819		491,480
Consumer Portfolio Segment | Home equity
Loans
Total loans, excluding purchased credit-impaired loans	238,952	266,377
Total loans	250,510		211,713
Consumer Portfolio Segment | Other
Loans
Total loans, excluding purchased credit-impaired loans	74,925	$ 80,781
Total loans	$ 76,715		$ 78,218

Loans (Details 2)

Loans (Details 2) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Contractual aging of the recorded investment in loans
Total loans, excluding covered loans	$ 13,465,064	$ 12,605,726
Total loans	13,614,141	12,768,803	$ 10,197,887
Non-performing loan aging
Contractual aging of the recorded investment in loans
Current	24,876	28,364
Past Due	27,327	30,988
Total loans	52,203	59,352
Purchased credit-impaired loans
Contractual aging of the recorded investment in loans
Current	83,158	86,169
Past Due	65,919	76,908
Total loans	149,077	163,077
30-59 Days Past Due | Non-performing loan aging
Contractual aging of the recorded investment in loans
Past Due	490	2,308
30-59 Days Past Due | Purchased credit-impaired loans
Contractual aging of the recorded investment in loans
Past Due	6,095	6,546
60-89 Days Past Due | Non-performing loan aging
Contractual aging of the recorded investment in loans
Past Due	767	978
60-89 Days Past Due | Purchased credit-impaired loans
Contractual aging of the recorded investment in loans
Past Due	3,625	6,600
Loans Past Due 90 Days or More | Non-performing loan aging
Contractual aging of the recorded investment in loans
Past Due	26,070	27,702
Loans Past Due 90 Days or More | Purchased credit-impaired loans
Contractual aging of the recorded investment in loans
Past Due	56,199	63,762
Total loans, excluding purchased credit-impaired loans
Contractual aging of the recorded investment in loans
Current	13,392,608	12,534,074
Past Due	72,456	71,652
Total loans, excluding covered loans	13,465,064	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	29,030	31,005
Total loans, excluding purchased credit-impaired loans | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	17,049	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	26,377	27,849
Total loans
Contractual aging of the recorded investment in loans
Current	13,475,766	12,620,243
Past Due	138,375	148,560
Total loans	13,614,141	12,768,803
Total loans | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	35,125	37,551
Total loans | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	20,674	19,398
Total loans | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	82,576	91,611
Commercial Portfolio Segment
Contractual aging of the recorded investment in loans
Current	4,688,835	4,337,348
Past Due	14,493	9,158
Total loans, excluding covered loans	4,703,328	4,346,506
Total loans	4,721,125		3,583,245
Commercial Portfolio Segment | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,963	2,515
Commercial Portfolio Segment | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	6,288	156
Commercial Portfolio Segment | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	5,242	6,487
Commercial Real Estate Portfolio Segment | Healthcare
Contractual aging of the recorded investment in loans
Current	649,415	582,450
Past Due	0	0
Total loans, excluding covered loans	649,415	582,450
Commercial Real Estate Portfolio Segment | Healthcare | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Commercial Real Estate Portfolio Segment | Healthcare | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Commercial Real Estate Portfolio Segment | Healthcare | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	0	0
Commercial Real Estate Portfolio Segment | Industrial
Contractual aging of the recorded investment in loans
Current	824,597	825,715
Past Due	7,250	7,678
Total loans, excluding covered loans	831,847	833,393
Commercial Real Estate Portfolio Segment | Industrial | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	3,045
Commercial Real Estate Portfolio Segment | Industrial | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	4,375	3,293
Commercial Real Estate Portfolio Segment | Industrial | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	2,875	1,340
Commercial Real Estate Portfolio Segment | Multifamily
Contractual aging of the recorded investment in loans
Current	589,626	547,107
Past Due	570	890
Total loans, excluding covered loans	590,196	547,997
Commercial Real Estate Portfolio Segment | Multifamily | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	458
Commercial Real Estate Portfolio Segment | Multifamily | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	53
Commercial Real Estate Portfolio Segment | Multifamily | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	570	379
Commercial Real Estate Portfolio Segment | Retail
Contractual aging of the recorded investment in loans
Current	490,205	506,789
Past Due	3,409	568
Total loans, excluding covered loans	493,614	507,357
Commercial Real Estate Portfolio Segment | Retail | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,348	568
Commercial Real Estate Portfolio Segment | Retail | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Commercial Real Estate Portfolio Segment | Retail | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	1,061	0
Commercial Real Estate Portfolio Segment | Office
Contractual aging of the recorded investment in loans
Current	407,469	405,992
Past Due	2,295	7,206
Total loans, excluding covered loans	409,764	413,198
Commercial Real Estate Portfolio Segment | Office | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	650	350
Commercial Real Estate Portfolio Segment | Office | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	475
Commercial Real Estate Portfolio Segment | Office | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	1,645	6,381
Commercial Real Estate Portfolio Segment | Construction real estate
Contractual aging of the recorded investment in loans
Current	449,116	518,171
Past Due	0	391
Total loans, excluding covered loans	449,116	518,562
Total loans	454,317		371,602
Commercial Real Estate Portfolio Segment | Construction real estate | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Commercial Real Estate Portfolio Segment | Construction real estate | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	391
Commercial Real Estate Portfolio Segment | Construction real estate | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	0	0
Commercial Real Estate Portfolio Segment | Other
Contractual aging of the recorded investment in loans
Current	904,560	899,950
Past Due	3,358	3,671
Total loans, excluding covered loans	907,918	903,621
Commercial Real Estate Portfolio Segment | Other | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,543	2,385
Commercial Real Estate Portfolio Segment | Other | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	224	1,155
Commercial Real Estate Portfolio Segment | Other | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	591	131
Consumer Portfolio Segment | Indirect vehicle
Contractual aging of the recorded investment in loans
Current	624,214	537,221
Past Due	3,605	4,459
Total loans, excluding covered loans	627,819	541,680
Total loans	627,819		491,480
Consumer Portfolio Segment | Indirect vehicle | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,656	2,836
Consumer Portfolio Segment | Indirect vehicle | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	709	1,062
Consumer Portfolio Segment | Indirect vehicle | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	240	561
Consumer Portfolio Segment | Home equity
Contractual aging of the recorded investment in loans
Current	233,135	261,765
Past Due	5,817	4,612
Total loans, excluding covered loans	238,952	266,377
Total loans	250,510		211,713
Consumer Portfolio Segment | Home equity | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	638	1,219
Consumer Portfolio Segment | Home equity | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	297	815
Consumer Portfolio Segment | Home equity | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	4,882	2,578
Consumer Portfolio Segment | Other
Contractual aging of the recorded investment in loans
Current	74,537	80,443
Past Due	388	338
Total loans, excluding covered loans	74,925	80,781
Total loans	76,715		78,218
Consumer Portfolio Segment | Other | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	275	152
Consumer Portfolio Segment | Other | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	70	120
Consumer Portfolio Segment | Other | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	43	66
Consumer Portfolio Segment | Residential real estate
Contractual aging of the recorded investment in loans
Current	1,400,794	1,041,189
Past Due	10,465	19,639
Total loans, excluding covered loans	1,411,259	1,060,828
Total loans	1,485,131		813,245
Consumer Portfolio Segment | Residential real estate | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	914	8,248
Consumer Portfolio Segment | Residential real estate | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	1,151	3,409
Consumer Portfolio Segment | Residential real estate | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	8,400	7,982
Collateralized | Commercial Portfolio Segment
Contractual aging of the recorded investment in loans
Current	2,056,105	1,989,934
Past Due	20,806	13,042
Total loans, excluding covered loans	2,076,911	2,002,976
Total loans	2,076,911		$ 1,794,465
Collateralized | Commercial Portfolio Segment | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	16,043	9,229
Collateralized | Commercial Portfolio Segment | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	3,935	1,869
Collateralized | Commercial Portfolio Segment | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	$ 828	$ 1,944

Loans (Details 3)

Loans (Details 3) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Contractual aging of the recorded investment in loans
Period past due of recorded investment in loans	90 days
Total loans
Contractual aging of the recorded investment in loans
Non-accrual	$ 51,013	$ 48,974
Loans past due 90 days or more and still accruing	1,190	10,378
Commercial Portfolio Segment
Contractual aging of the recorded investment in loans
Non-accrual	7,126	11,222
Loans past due 90 days or more and still accruing	0	1,406
Commercial Real Estate Portfolio Segment | Healthcare
Contractual aging of the recorded investment in loans
Non-accrual	0	0
Loans past due 90 days or more and still accruing	0	0
Commercial Real Estate Portfolio Segment | Industrial
Contractual aging of the recorded investment in loans
Non-accrual	2,876	276
Loans past due 90 days or more and still accruing	0	1,064
Commercial Real Estate Portfolio Segment | Multifamily
Contractual aging of the recorded investment in loans
Non-accrual	2,951	2,662
Loans past due 90 days or more and still accruing	0	0
Commercial Real Estate Portfolio Segment | Office
Contractual aging of the recorded investment in loans
Non-accrual	2,041	896
Loans past due 90 days or more and still accruing	0	6,381
Commercial Real Estate Portfolio Segment | Retail
Contractual aging of the recorded investment in loans
Non-accrual	1,193	384
Loans past due 90 days or more and still accruing	0	0
Commercial Real Estate Portfolio Segment | Other
Contractual aging of the recorded investment in loans
Non-accrual	131	83
Loans past due 90 days or more and still accruing	320	21
Commercial Real Estate Portfolio Segment | Construction real estate
Contractual aging of the recorded investment in loans
Non-accrual	0	0
Loans past due 90 days or more and still accruing	0	0
Consumer Portfolio Segment | Residential real estate
Contractual aging of the recorded investment in loans
Non-accrual	17,229	16,538
Loans past due 90 days or more and still accruing	147	235
Consumer Portfolio Segment | Indirect vehicle
Contractual aging of the recorded investment in loans
Non-accrual	2,294	2,355
Loans past due 90 days or more and still accruing	0	10
Consumer Portfolio Segment | Home equity
Contractual aging of the recorded investment in loans
Non-accrual	14,808	13,187
Loans past due 90 days or more and still accruing	0	0
Consumer Portfolio Segment | Other
Contractual aging of the recorded investment in loans
Non-accrual	5	7
Loans past due 90 days or more and still accruing	42	64
Collateralized | Commercial Portfolio Segment
Contractual aging of the recorded investment in loans
Non-accrual	359	1,364
Loans past due 90 days or more and still accruing	$ 681	$ 1,197

Loans (Details 4)

Loans (Details 4) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Loans
Commercial related loans, excluding purchased credit-impaired loans	$ 11,112,109	$ 10,656,060
Non-performing substandard and doubtful loans	16,700	17,300
Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	10,677,793	10,255,548
Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	283,113	238,651
Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	151,203	161,861
Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Portfolio Segment
Loans
Commercial related loans, excluding purchased credit-impaired loans	4,703,328	4,346,506
Commercial Portfolio Segment | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	4,485,246	4,127,397
Commercial Portfolio Segment | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	150,485	113,838
Commercial Portfolio Segment | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	67,597	105,271
Commercial Portfolio Segment | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Healthcare
Loans
Commercial related loans, excluding purchased credit-impaired loans	649,415	582,450
Commercial Real Estate Portfolio Segment | Healthcare | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	608,517	545,663
Commercial Real Estate Portfolio Segment | Healthcare | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	25,640	32,251
Commercial Real Estate Portfolio Segment | Healthcare | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	15,258	4,536
Commercial Real Estate Portfolio Segment | Healthcare | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Industrial
Loans
Commercial related loans, excluding purchased credit-impaired loans	831,847	833,393
Commercial Real Estate Portfolio Segment | Industrial | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	799,572	814,668
Commercial Real Estate Portfolio Segment | Industrial | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	25,807	17,962
Commercial Real Estate Portfolio Segment | Industrial | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	6,468	763
Commercial Real Estate Portfolio Segment | Industrial | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Other
Loans
Commercial related loans, excluding purchased credit-impaired loans	907,918	903,621
Commercial Real Estate Portfolio Segment | Other | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	812,418	820,229
Commercial Real Estate Portfolio Segment | Other | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	61,152	44,629
Commercial Real Estate Portfolio Segment | Other | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	34,348	38,763
Commercial Real Estate Portfolio Segment | Other | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Construction real estate
Loans
Commercial related loans, excluding purchased credit-impaired loans	449,116	518,562
Commercial Real Estate Portfolio Segment | Construction real estate | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	448,584	518,562
Commercial Real Estate Portfolio Segment | Construction real estate | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	532	0
Commercial Real Estate Portfolio Segment | Construction real estate | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Construction real estate | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Multifamily
Loans
Commercial related loans, excluding purchased credit-impaired loans	590,196	547,997
Commercial Real Estate Portfolio Segment | Multifamily | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	579,971	544,071
Commercial Real Estate Portfolio Segment | Multifamily | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	155	312
Commercial Real Estate Portfolio Segment | Multifamily | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	10,070	3,614
Commercial Real Estate Portfolio Segment | Multifamily | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Retail
Loans
Commercial related loans, excluding purchased credit-impaired loans	493,614	507,357
Commercial Real Estate Portfolio Segment | Retail | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	483,638	498,458
Commercial Real Estate Portfolio Segment | Retail | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	6,600	8,350
Commercial Real Estate Portfolio Segment | Retail | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	3,376	549
Commercial Real Estate Portfolio Segment | Retail | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Commercial Real Estate Portfolio Segment | Office
Loans
Commercial related loans, excluding purchased credit-impaired loans	409,764	413,198
Commercial Real Estate Portfolio Segment | Office | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	402,731	404,811
Commercial Real Estate Portfolio Segment | Office | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	2,296	5,299
Commercial Real Estate Portfolio Segment | Office | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	4,737	3,088
Commercial Real Estate Portfolio Segment | Office | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	0	0
Consumer Portfolio Segment
Loans
Commercial related loans, excluding purchased credit-impaired loans	2,352,955	1,949,666
Consumer Portfolio Segment | Performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	2,318,430	1,917,270
Consumer Portfolio Segment | Non-performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	34,525	32,396
Consumer Portfolio Segment | Residential real estate
Loans
Commercial related loans, excluding purchased credit-impaired loans	1,411,259	1,060,828
Consumer Portfolio Segment | Residential real estate | Performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	1,393,883	1,044,055
Consumer Portfolio Segment | Residential real estate | Non-performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	17,376	16,773
Consumer Portfolio Segment | Indirect vehicle
Loans
Commercial related loans, excluding purchased credit-impaired loans	627,819	541,680
Consumer Portfolio Segment | Indirect vehicle | Performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	625,525	539,315
Consumer Portfolio Segment | Indirect vehicle | Non-performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	2,294	2,365
Consumer Portfolio Segment | Home equity
Loans
Commercial related loans, excluding purchased credit-impaired loans	238,952	266,377
Consumer Portfolio Segment | Home equity | Performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	224,144	253,190
Consumer Portfolio Segment | Home equity | Non-performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	14,808	13,187
Consumer Portfolio Segment | Other
Loans
Commercial related loans, excluding purchased credit-impaired loans	74,925	80,781
Consumer Portfolio Segment | Other | Performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	74,878	80,710
Consumer Portfolio Segment | Other | Non-performing
Loans
Commercial related loans, excluding purchased credit-impaired loans	47	71
Collateralized | Commercial Portfolio Segment
Loans
Commercial related loans, excluding purchased credit-impaired loans	2,076,911	2,002,976
Collateralized | Commercial Portfolio Segment | Pass
Loans
Commercial related loans, excluding purchased credit-impaired loans	2,057,116	1,981,689
Collateralized | Commercial Portfolio Segment | Special Mention
Loans
Commercial related loans, excluding purchased credit-impaired loans	10,446	16,010
Collateralized | Commercial Portfolio Segment | Substandard
Loans
Commercial related loans, excluding purchased credit-impaired loans	9,349	5,277
Collateralized | Commercial Portfolio Segment | Doubtful
Loans
Commercial related loans, excluding purchased credit-impaired loans	$ 0	$ 0

Loans (Details 5)

Loans (Details 5) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Loans
Amount of mortgage loans in process of foreclosure	$ 41,300	$ 41,300	$ 29,100
Unpaid Principal Balance	76,816	76,816	80,356
Recorded Investment	71,107	71,107	73,914
Partial Charge-offs	5,709	5,709	6,442
Allowance for Loan Losses Allocated	6,579	6,579	8,336
Average Recorded Investment	71,034	71,678	87,645
Interest Income Recognized	174	382	52
Performing
Loans
Restructured loans	29,658	29,658	32,687
Non-performing
Loans
Restructured loans	23,658	23,658	27,068
Commercial Portfolio Segment | Impaired financing receivable with no allowance
Loans
Unpaid Principal Balance	3,501	3,501	9,056
Recorded Investment	3,501	3,501	9,056
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	2,218	4,875	5,944
Interest Income Recognized	22	37	0
Commercial Portfolio Segment | Impaired financing receivable with allowance
Loans
Unpaid Principal Balance	7,666	7,666	14,403
Recorded Investment	7,666	7,666	14,403
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	1,076	1,076	2,889
Average Recorded Investment	8,428	8,519	22,737
Interest Income Recognized	26	173	0
Commercial Real Estate Portfolio Segment | Healthcare | Impaired financing receivable with no allowance
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Commercial Real Estate Portfolio Segment | Healthcare | Impaired financing receivable with allowance
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Commercial Real Estate Portfolio Segment | Industrial | Impaired financing receivable with no allowance
Loans
Unpaid Principal Balance	2,167	2,167	0
Recorded Investment	1,871	1,871	0
Partial Charge-offs	296	296	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	1,803	1,854	402
Interest Income Recognized	8	8	0
Commercial Real Estate Portfolio Segment | Industrial | Impaired financing receivable with allowance
Loans
Unpaid Principal Balance	3,252	3,252	0
Recorded Investment	3,252	3,252	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	493	493	0
Average Recorded Investment	3,309	1,664	0
Interest Income Recognized	32	32	0
Commercial Real Estate Portfolio Segment | Multifamily | Impaired financing receivable with no allowance
Loans
Unpaid Principal Balance	1,824	1,824	1,922
Recorded Investment	1,824	1,824	1,922
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	2,248	2,543	2,348
Interest Income Recognized	0	29	0
Commercial Real Estate Portfolio Segment | Multifamily | Impaired financing receivable with allowance
Loans
Unpaid Principal Balance	570	570	0
Recorded Investment	570	570	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	223	223	0
Average Recorded Investment	565	284	0
Interest Income Recognized	0	0	0
Commercial Real Estate Portfolio Segment | Retail | Impaired financing receivable with no allowance
Loans
Unpaid Principal Balance	4,328	4,328	2,670
Recorded Investment	2,587	2,587	929
Partial Charge-offs	1,741	1,741	1,741
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	2,356	1,641	2,165
Interest Income Recognized	27	27	0
Commercial Real Estate Portfolio Segment | Retail | Impaired financing receivable with allowance
Loans
Unpaid Principal Balance	1,851	1,851	3,592
Recorded Investment	1,851	1,851	3,592
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	8	8	354
Average Recorded Investment	1,855	2,713	6,827
Interest Income Recognized	28	28	0
Commercial Real Estate Portfolio Segment | Office | Impaired financing receivable with no allowance
Loans
Unpaid Principal Balance	1,865	1,865	0
Recorded Investment	1,865	1,865	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	1,911	1,620	256
Interest Income Recognized	6	6	0
Commercial Real Estate Portfolio Segment | Office | Impaired financing receivable with allowance
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	745
Interest Income Recognized	0	0	0
Commercial Real Estate Portfolio Segment | Other | Impaired financing receivable with no allowance
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	60
Interest Income Recognized	0	0	0
Commercial Real Estate Portfolio Segment | Other | Impaired financing receivable with allowance
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	235
Interest Income Recognized	0	0	0
Commercial Real Estate Portfolio Segment | Construction real estate | Impaired financing receivable with no allowance
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Commercial Real Estate Portfolio Segment | Construction real estate | Impaired financing receivable with allowance
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Consumer Portfolio Segment | Real estate | Impaired financing receivable with no allowance
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Consumer Portfolio Segment | Real estate | Impaired financing receivable with allowance
Loans
Unpaid Principal Balance	18,637	18,637	16,257
Recorded Investment	16,956	16,956	14,353
Partial Charge-offs	1,681	1,681	1,904
Allowance for Loan Losses Allocated	1,839	1,839	2,163
Average Recorded Investment	16,890	16,349	13,412
Interest Income Recognized	4	5	0
Consumer Portfolio Segment | Indirect vehicle | Impaired financing receivable with no allowance
Loans
Unpaid Principal Balance	250	250	223
Recorded Investment	144	144	122
Partial Charge-offs	106	106	101
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	305	282	252
Interest Income Recognized	5	10	0
Consumer Portfolio Segment | Indirect vehicle | Impaired financing receivable with allowance
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Consumer Portfolio Segment | Home equity | Impaired financing receivable with no allowance
Loans
Unpaid Principal Balance	815	815	0
Recorded Investment	815	815	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	815	704	143
Interest Income Recognized	0	0	0
Consumer Portfolio Segment | Home equity | Impaired financing receivable with allowance
Loans
Unpaid Principal Balance	30,074	30,074	31,104
Recorded Investment	28,204	28,204	28,790
Partial Charge-offs	1,870	1,870	2,314
Allowance for Loan Losses Allocated	2,940	2,940	2,930
Average Recorded Investment	28,197	28,023	28,677
Interest Income Recognized	16	27	0
Consumer Portfolio Segment | Other consumer | Impaired financing receivable with no allowance
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Consumer Portfolio Segment | Other consumer | Impaired financing receivable with allowance
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	0
Interest Income Recognized	0	0	0
Collateralized | Commercial Portfolio Segment | Impaired financing receivable with no allowance
Loans
Unpaid Principal Balance	16	16	1,129
Recorded Investment	1	1	747
Partial Charge-offs	15	15	382
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	134	607	1,045
Interest Income Recognized	0	0	34
Collateralized | Commercial Portfolio Segment | Impaired financing receivable with allowance
Loans
Unpaid Principal Balance	0	0	0
Recorded Investment	0	0	0
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	2,397
Interest Income Recognized	$ 0	$ 0	$ 18

Loans (Details 6)

Loans (Details 6)	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)loan	Jun. 30, 2016USD ($)loan	Jun. 30, 2017USD ($)loan	Jun. 30, 2016USD ($)loan
Restructured loans
Redefaulted loans			$ 0
Period past due of redefaulted loans			90 days
Performing
Restructured loans
Number of Loans | loan	14	1	18	3
Pre-Modification Recorded Investment	$ 6,513,000	$ 1,870,000	$ 6,954,000	$ 2,280,000
Post-Modification Recorded Investment	6,513,000	1,870,000	6,954,000	2,280,000
Charge-offs and Specific Reserves	$ 462,000	$ 412,000	$ 514,000	$ 412,000
Non-performing
Restructured loans
Number of Loans | loan	24	27	37	47
Pre-Modification Recorded Investment	$ 3,664,000	$ 10,789,000	$ 4,942,000	$ 12,022,000
Post-Modification Recorded Investment	3,664,000	10,789,000	4,942,000	12,022,000
Charge-offs and Specific Reserves	$ 371,000	$ 3,536,000	$ 529,000	$ 3,609,000
Commercial Portfolio Segment | Performing
Restructured loans
Number of Loans | loan	5	1	5	1
Pre-Modification Recorded Investment	$ 2,491,000	$ 1,870,000	$ 2,491,000	$ 1,870,000
Post-Modification Recorded Investment	2,491,000	1,870,000	2,491,000	1,870,000
Charge-offs and Specific Reserves	$ 373,000	$ 412,000	$ 373,000	$ 412,000
Commercial Portfolio Segment | Non-performing
Restructured loans
Number of Loans | loan	2	4	2	4
Pre-Modification Recorded Investment	$ 676,000	$ 8,607,000	$ 676,000	$ 8,607,000
Post-Modification Recorded Investment	676,000	8,607,000	676,000	8,607,000
Charge-offs and Specific Reserves	$ 0	$ 3,500,000	$ 0	$ 3,500,000
Commercial Real Estate Portfolio Segment | Office | Performing
Restructured loans
Number of Loans | loan	1		1
Pre-Modification Recorded Investment	$ 549,000		$ 549,000
Post-Modification Recorded Investment	549,000		549,000
Charge-offs and Specific Reserves	$ 0		$ 0
Commercial Real Estate Portfolio Segment | Other | Performing
Restructured loans
Number of Loans | loan	1		1
Pre-Modification Recorded Investment	$ 147,000		$ 147,000
Post-Modification Recorded Investment	147,000		147,000
Charge-offs and Specific Reserves	$ 0		$ 0
Commercial Real Estate Portfolio Segment | Multifamily | Non-performing
Restructured loans
Number of Loans | loan	3		3
Pre-Modification Recorded Investment	$ 290,000		$ 290,000
Post-Modification Recorded Investment	290,000		290,000
Charge-offs and Specific Reserves	$ 0		$ 0
Commercial Real Estate Portfolio Segment | Retail | Non-performing
Restructured loans
Number of Loans | loan	1		1
Pre-Modification Recorded Investment	$ 906,000		$ 906,000
Post-Modification Recorded Investment	906,000		906,000
Charge-offs and Specific Reserves	$ 0		$ 0
Consumer Portfolio Segment | Real estate | Performing
Restructured loans
Number of Loans | loan	3		6
Pre-Modification Recorded Investment	$ 493,000		$ 902,000
Post-Modification Recorded Investment	493,000		902,000
Charge-offs and Specific Reserves	$ 86,000		$ 135,000
Consumer Portfolio Segment | Real estate | Non-performing
Restructured loans
Number of Loans | loan	8	1	17	2
Pre-Modification Recorded Investment	$ 1,122,000	$ 83,000	$ 2,380,000	$ 155,000
Post-Modification Recorded Investment	1,122,000	83,000	2,380,000	155,000
Charge-offs and Specific Reserves	$ 289,000	$ 0	$ 443,000	$ 0
Consumer Portfolio Segment | Indirect vehicle | Non-performing
Restructured loans
Number of Loans | loan	8	8	11	18
Pre-Modification Recorded Investment	$ 77,000	$ 69,000	$ 97,000	$ 149,000
Post-Modification Recorded Investment	77,000	69,000	97,000	149,000
Charge-offs and Specific Reserves	$ 25,000	$ 21,000	$ 29,000	$ 43,000
Consumer Portfolio Segment | Home equity | Performing
Restructured loans
Number of Loans | loan	2		3	2
Pre-Modification Recorded Investment	$ 46,000		$ 78,000	$ 410,000
Post-Modification Recorded Investment	46,000		78,000	410,000
Charge-offs and Specific Reserves	$ 3,000		$ 6,000	$ 0
Consumer Portfolio Segment | Home equity | Non-performing
Restructured loans
Number of Loans | loan	2	14	3	23
Pre-Modification Recorded Investment	$ 593,000	$ 2,030,000	$ 593,000	$ 3,111,000
Post-Modification Recorded Investment	593,000	2,030,000	593,000	3,111,000
Charge-offs and Specific Reserves	$ 57,000	$ 15,000	$ 57,000	$ 66,000
Industrial | Commercial Real Estate Portfolio Segment | Performing
Restructured loans
Number of Loans | loan	2		2
Pre-Modification Recorded Investment	$ 2,787,000		$ 2,787,000
Post-Modification Recorded Investment	2,787,000		2,787,000
Charge-offs and Specific Reserves	$ 0		$ 0

Loans (Details 7)

Loans (Details 7) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Performing
Financing Receivable, Modifications, Post Modification Recorded Investment [Roll Forward]
Beginning balance	$ 32,687
Additions	6,954
Charge-offs	0
Principal payments, net	(631)
Removals	(10,630)
Transfer to other real estate owned	0
Transfers in	1,448
Transfers out	(170)
Ending balance	29,658
Non-performing
Financing Receivable, Modifications, Post Modification Recorded Investment [Roll Forward]
Beginning balance	27,068
Additions	4,942
Charge-offs	(383)
Principal payments, net	(4,013)
Removals	(2,389)
Transfer to other real estate owned	(289)
Transfers in	170
Transfers out	(1,448)
Ending balance	$ 23,658

Loans (Details 8)

Loans (Details 8) $ in Thousands	6 Months Ended
	Jun. 30, 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
Post-modification recorded investment	$ 11,896
Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	1,110
Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	9,436
Delay in Payments or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	1,350
Commercial Portfolio Segment
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	3,167
Commercial Portfolio Segment | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Portfolio Segment | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	3,167
Commercial Portfolio Segment | Delay in Payments or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Healthcare
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Healthcare | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Healthcare | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Healthcare | Delay in Payments or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Industrial
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	2,787
Commercial Real Estate Portfolio Segment | Industrial | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Industrial | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	2,787
Commercial Real Estate Portfolio Segment | Industrial | Delay in Payments or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Multifamily
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	290
Commercial Real Estate Portfolio Segment | Multifamily | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Multifamily | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	290
Commercial Real Estate Portfolio Segment | Multifamily | Delay in Payments or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Retail
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	906
Commercial Real Estate Portfolio Segment | Retail | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Retail | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	906
Commercial Real Estate Portfolio Segment | Retail | Delay in Payments or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Office
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	549
Commercial Real Estate Portfolio Segment | Office | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Office | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	549
Commercial Real Estate Portfolio Segment | Office | Delay in Payments or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Other
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	147
Commercial Real Estate Portfolio Segment | Other | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Other | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	147
Commercial Real Estate Portfolio Segment | Other | Delay in Payments or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Construction real estate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Construction real estate | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Construction real estate | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Commercial Real Estate Portfolio Segment | Construction real estate | Delay in Payments or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Consumer Portfolio Segment | Residential real estate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	3,282
Consumer Portfolio Segment | Residential real estate | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	1,110
Consumer Portfolio Segment | Residential real estate | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	1,589
Consumer Portfolio Segment | Residential real estate | Delay in Payments or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	583
Consumer Portfolio Segment | Indirect vehicle
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	97
Consumer Portfolio Segment | Indirect vehicle | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Consumer Portfolio Segment | Indirect vehicle | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Consumer Portfolio Segment | Indirect vehicle | Delay in Payments or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	97
Consumer Portfolio Segment | Home equity
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	671
Consumer Portfolio Segment | Home equity | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Consumer Portfolio Segment | Home equity | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	1
Consumer Portfolio Segment | Home equity | Delay in Payments or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	670
Consumer Portfolio Segment | Other consumer
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Consumer Portfolio Segment | Other consumer | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Consumer Portfolio Segment | Other consumer | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Consumer Portfolio Segment | Other consumer | Delay in Payments or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Collateralized | Commercial Portfolio Segment
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Collateralized | Commercial Portfolio Segment | Extended Maturity, Amortization and Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Collateralized | Commercial Portfolio Segment | Extended Maturity and/or Amortization
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	0
Collateralized | Commercial Portfolio Segment | Delay in Payments or Reduction of Interest Rate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Post-modification recorded investment	$ 0

Loans (Details 9)

Loans (Details 9) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Allowance for credit losses:
Beginning balance				$ 139,366
Ending balance		$ 154,033		154,033
Unfunded Commitments
Allowance for unfunded credit commitments, Beginning balance		2,328	$ 3,239	2,476	$ 3,368
Allowance for unfunded commitments, Charge-Offs			0	0	0
Allowance for unfunded commitments, Recoveries			0	0	0
Allowance for unfunded commitments, Provision		(64)	(520)	(212)	(649)
Allowance for unfunded credit commitments, Ending balance		2,264	2,719	2,264	2,719
Allowance for credit losses
Allowance for credit losses, Beginning balance		146,498	137,732	141,842	131,508
Allowance for loan losses and unfunded commitments charge offs		2,921	6,424	6,294	10,012
Allowance for loan losses and unfunded commitments recoveries		3,021	4,196	7,316	6,445
Allowance for loan losses and unfunded commitments provision		9,699	2,829	13,433	10,392
Allowance for credit losses, Ending balance		156,297	138,333	156,297	138,333
Ending allowance balance attributable to loans:
Individually evaluated for impairment, Unfunded commitments		516	731	516	731
Individually evaluated for impairment, Total		7,095	18,101	7,095	18,101
Collectively evaluated for impairment, Unfunded commitments		1,748	1,988	1,748	1,988
Collectively evaluated for impairment, Total		148,670	119,519	148,670	119,519
Acquired and accounted for under ASC 310-30	[1]	532	713	532	713
Acquired and accounted for under ASC 310-30, Unfunded commitments	[1]	0	0	0	0
Loans:
Individually evaluated for impairment		71,107	83,398	71,107	83,398
Individually evaluated for impairment, Unfunded commitments		0	0	0	0
Collectively evaluated for impairment		13,393,957	9,977,678	13,393,957	9,977,678
Collectively evaluated for impairment, Unfunded commitments		0	0	0	0
Acquired and accounted for under ASC 310-30	[1]	149,077	136,811	149,077	136,811
Acquired and accounted for under ASC 310-30, Unfunded commitments	[1]	0	0	0	0
Total loans		13,614,141	10,197,887	13,614,141	10,197,887	$ 12,768,803
Total loans, Unfunded commitments		0	0	0	0
Commercial Portfolio Segment
Allowance for credit losses:
Beginning balance		40,690	46,962	44,661	39,316
Charge-offs		700	72	868	785
Recoveries		1,339	952	2,849	1,332
Provision		2,454	2,455	(2,859)	10,434
Ending balance		43,783	50,297	43,783	50,297
Ending allowance balance attributable to loans:
Individually evaluated for impairment		1,076	11,388	1,076	11,388
Collectively evaluated for impairment		42,619	38,762	42,619	38,762
Acquired and accounted for under ASC 310-30	[1]	88	147	88	147
Loans:
Individually evaluated for impairment		11,167	31,652	11,167	31,652
Collectively evaluated for impairment		4,692,161	3,529,848	4,692,161	3,529,848
Acquired and accounted for under ASC 310-30	[1]	17,797	21,745	17,797	21,745
Total loans		4,721,125	3,583,245	4,721,125	3,583,245
Commercial Real Estate Portfolio Segment | Commercial real estate
Allowance for credit losses:
Beginning balance		58,220	46,785	51,807	45,475
Charge-offs		262	1,720	1,347	2,072
Recoveries		362	1,843	880	2,437
Provision		4,927	(868)	11,907	200
Ending balance		63,247	46,040	63,247	46,040
Ending allowance balance attributable to loans:
Individually evaluated for impairment		724	426	724	426
Collectively evaluated for impairment		62,115	45,084	62,115	45,084
Acquired and accounted for under ASC 310-30	[1]	408	530	408	530
Loans:
Individually evaluated for impairment		13,820	7,962	13,820	7,962
Collectively evaluated for impairment		3,868,934	2,819,758	3,868,934	2,819,758
Acquired and accounted for under ASC 310-30	[1]	38,859	26,199	38,859	26,199
Total loans		3,921,613	2,853,919	3,921,613	2,853,919
Commercial Real Estate Portfolio Segment | Construction real estate
Allowance for credit losses:
Beginning balance		14,859	14,614	14,758	15,113
Charge-offs		0	144	0	144
Recoveries		47	17	159	44
Provision		357	(257)	346	(783)
Ending balance		15,263	14,230	15,263	14,230
Ending allowance balance attributable to loans:
Individually evaluated for impairment			0		0
Collectively evaluated for impairment		15,227	14,194	15,227	14,194
Acquired and accounted for under ASC 310-30	[1]	36	36	36	36
Loans:
Individually evaluated for impairment		0	0	0	0
Collectively evaluated for impairment		449,116	357,807	449,116	357,807
Acquired and accounted for under ASC 310-30	[1]	5,201	13,795	5,201	13,795
Total loans		454,317	371,602	454,317	371,602
Consumer Portfolio Segment | Residential real estate
Allowance for credit losses:
Beginning balance		8,131	5,596	5,971	5,734
Charge-offs		270	476	360	844
Recoveries		58	82	586	106
Provision		330	(402)	2,052	(196)
Ending balance		8,249	4,800	8,249	4,800
Ending allowance balance attributable to loans:
Individually evaluated for impairment		1,839	2,446	1,839	2,446
Collectively evaluated for impairment		6,410	2,354	6,410	2,354
Acquired and accounted for under ASC 310-30	[1]		0		0
Loans:
Individually evaluated for impairment		16,956	13,049	16,956	13,049
Collectively evaluated for impairment		1,394,303	740,658	1,394,303	740,658
Acquired and accounted for under ASC 310-30	[1]	73,872	59,538	73,872	59,538
Total loans		1,485,131	813,245	1,485,131	813,245
Consumer Portfolio Segment | Indirect vehicle
Allowance for credit losses:
Beginning balance		3,624	2,732	3,421	2,418
Charge-offs		930	651	2,341	1,582
Recoveries		565	501	1,217	964
Provision		704	518	1,666	1,300
Ending balance		3,963	3,100	3,963	3,100
Ending allowance balance attributable to loans:
Individually evaluated for impairment			0		0
Collectively evaluated for impairment		3,963	3,100	3,963	3,100
Acquired and accounted for under ASC 310-30	[1]		0		0
Loans:
Individually evaluated for impairment		144	146	144	146
Collectively evaluated for impairment		627,675	491,334	627,675	491,334
Acquired and accounted for under ASC 310-30	[1]	0	0	0	0
Total loans		627,819	491,480	627,819	491,480
Consumer Portfolio Segment | Home equity
Allowance for credit losses:
Beginning balance		5,312	5,022	5,469	7,374
Charge-offs		261	619	434	857
Recoveries		292	193	575	511
Provision		206	(397)	(61)	(2,829)
Ending balance		5,549	4,199	5,549	4,199
Ending allowance balance attributable to loans:
Individually evaluated for impairment		2,940	2,719	2,940	2,719
Collectively evaluated for impairment		2,609	1,480	2,609	1,480
Acquired and accounted for under ASC 310-30	[1]		0		0
Loans:
Individually evaluated for impairment		29,019	29,419	29,019	29,419
Collectively evaluated for impairment		209,933	169,203	209,933	169,203
Acquired and accounted for under ASC 310-30	[1]	11,558	13,091	11,558	13,091
Total loans		250,510	211,713	250,510	211,713
Consumer Portfolio Segment | Other
Allowance for credit losses:
Beginning balance		1,191	2,277	1,041	2,276
Charge-offs		498	395	944	807
Recoveries		109	141	338	534
Provision		412	376	779	396
Ending balance		1,214	2,399	1,214	2,399
Ending allowance balance attributable to loans:
Individually evaluated for impairment			0		0
Collectively evaluated for impairment		1,214	2,399	1,214	2,399
Acquired and accounted for under ASC 310-30	[1]		0		0
Loans:
Individually evaluated for impairment		0	0	0	0
Collectively evaluated for impairment		74,925	75,775	74,925	75,775
Acquired and accounted for under ASC 310-30	[1]	1,790	2,443	1,790	2,443
Total loans		76,715	78,218	76,715	78,218
Collateralized | Commercial Portfolio Segment
Allowance for credit losses:
Beginning balance		12,143	10,505	12,238	10,434
Charge-offs		0	2,347	0	2,921
Recoveries		249	467	712	517
Provision		373	1,924	(185)	2,519
Ending balance		12,765	10,549	12,765	10,549
Ending allowance balance attributable to loans:
Individually evaluated for impairment		0	391	0	391
Collectively evaluated for impairment		12,765	10,158	12,765	10,158
Acquired and accounted for under ASC 310-30	[1]		0		0
Loans:
Individually evaluated for impairment		1	1,170	1	1,170
Collectively evaluated for impairment		2,076,910	1,793,295	2,076,910	1,793,295
Acquired and accounted for under ASC 310-30	[1]	0	0	0	0
Total loans		$ 2,076,911	$ 1,794,465	$ 2,076,911	$ 1,794,465
[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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Commercial Real Estate Portfolio Segment | 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	$ 4,927	$ (868)	$ 11,907	$ 200
Allowance for loan losses and unfunded commitments acquired with deteriorated credit quality	$ 532		532		$ 866
Purchased Credit-Impaired 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			(203)
Allowance for loan losses and unfunded commitments write offs net of recoveries			$ 131

Loans (Details 11)

Loans (Details 11) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Changes in the accretable yield for purchased credit-impaired loans
Balance at beginning of period		$ 14,911	$ 13,970	$ 16,050	$ 12,596
Purchases		0	0	43	0
Accretion		(2,831)	(2,419)	(5,019)	(4,629)
Other	[1]	606	1,609	1,612	5,193
Balance at end of period		$ 12,686	$ 13,160	$ 12,686	$ 13,160
[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	Jun. 30, 2017USD ($)
Loans
Non covered loans	$ 1,967,483
Total acquired	1,983,960
Purchased Credit-Impaired Loans
Loans
Non covered loans	66,916
Total acquired	83,393
Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	1,900,567
Total acquired	1,900,567
Other Loans | Purchased Credit-Impaired Loans | Ginnie Mae
Loans
Consumer related purchased credit-impaired loans	65,700
Commercial Loans, Commercial Real Estate Receivable and Construction Loans | Heritage
Loans
Loans not covered under the loss share agreement	1,500
Commercial Loans, Commercial Real Estate Receivable and Construction Loans | Benchmark
Loans
Loans not covered under the loss share agreement	231
Commercial Loans, Commercial Real Estate Receivable and Construction Loans | Broadway and New Century
Loans
Loans not covered under the loss share agreement	4,600
Consumer Portfolio Segment | Consumer related
Loans
Covered loans	16,477	[1]
Non covered loans	318,826
Consumer Portfolio Segment | Consumer related | Purchased Credit-Impaired Loans
Loans
Covered loans	16,477	[1]
Non covered loans	5,059
Consumer Portfolio Segment | Consumer related | Purchased Non-Credit-Impaired Loans
Loans
Covered loans	0	[1]
Non covered loans	313,767
Commercial Portfolio Segment
Loans
Non covered loans	499,937
Commercial Portfolio Segment | Purchased Credit-Impaired Loans
Loans
Non covered loans	17,797
Commercial Portfolio Segment | Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	482,140
Commercial Real Estate Portfolio Segment | Real estate
Loans
Non covered loans	1,075,018
Commercial Real Estate Portfolio Segment | Real estate | Purchased Credit-Impaired Loans
Loans
Non covered loans	38,859
Commercial Real Estate Portfolio Segment | Real estate | Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	1,036,159
Commercial Real Estate Portfolio Segment | Construction real estate
Loans
Non covered loans	18,041
Commercial Real Estate Portfolio Segment | Construction real estate | Purchased Credit-Impaired Loans
Loans
Non covered loans	5,201
Commercial Real Estate Portfolio Segment | Construction real estate | Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	12,840
Collateralized | Commercial Portfolio Segment
Loans
Non covered loans	55,661
Collateralized | Commercial Portfolio Segment | Purchased Credit-Impaired Loans
Loans
Non covered loans	0
Collateralized | Commercial Portfolio Segment | Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	$ 55,661
[1]	Covered loans refer to loans covered under loss-sharing agreements with the FDIC.

Goodwill and Intangibles (Detai

Goodwill and Intangibles (Details)	6 Months Ended
	Jun. 30, 2017USD ($)segment	Jun. 30, 2016USD ($)	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	6 Months Ended
	Jun. 30, 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 during the first quarter of 2017.

Goodwill and Intangibles (Det63

Goodwill and Intangibles (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017
Changes in the carrying amount of core deposit and client relationship intangibles
Balance at beginning of period			$ 62,959
Amortization expense	$ (2,086)	$ (1,617)	(4,176)	$ (3,243)
Balance at end of period	58,783		58,783
Gross carrying amount					$ 112,820
Accumulated amortization					(54,037)
Net book value	$ 58,783		$ 62,959		$ 58,783

Goodwill and Intangibles (Det64

Goodwill and Intangibles (Details 4) $ in Thousands	Jun. 30, 2017USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,017	$ 4,017
2,018	7,451
2,019	5,674
2,020	5,022
2,021	4,790
Thereafter	31,829
Total estimated future amortization expense	$ 58,783

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Banking and Thrift [Abstract]
Demand deposit accounts, noninterest bearing	$ 6,388,292	$ 6,408,169
NOW, money market and interest bearing deposits	4,600,506	4,543,004
Savings accounts	1,109,155	1,135,992
Certificates of deposit, $250,000 or more	1,221,043	1,144,121
Other certificates of deposit	942,823	879,162
Total deposits	14,261,819	14,110,448
Brokered deposits	$ 820,800	$ 795,000

Short-Term Borrowings (Details)

Short-Term Borrowings (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Short-term borrowings
Weighted Average Interest Rate	1.09%	0.59%
Amount	$ 1,993,358,000	$ 1,569,288,000
Customer repurchase agreements
Short-term borrowings
Weighted Average Interest Rate	0.22%	0.22%
Amount	$ 203,358,000	$ 237,538,000
Federal Home Loan Bank advances
Short-term borrowings
Weighted Average Interest Rate	1.18%	0.63%
Amount	$ 1,650,000,000	$ 1,275,000,000
Federal funds purchased
Short-term borrowings
Weighted Average Interest Rate	1.32%	0.80%
Amount	$ 140,000,000	$ 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 ($)	Aug. 24, 2016	Dec. 18, 2015	Jun. 30, 2017	Dec. 31, 2016
Short-term borrowings
Fixed interest rate Federal Home Loan Bank advances			$ 1,700,000,000	$ 1,300,000,000
Short-term borrowings			1,993,358,000	1,569,288,000
London Interbank Offered Rate (LIBOR)
Short-term borrowings
Basis spread on variable rate	1.75%
Federal Home Loan Bank advances
Short-term borrowings
Short-term borrowings			1,650,000,000	1,275,000,000
Line of credit
Short-term borrowings
Line of credit facility, maximum borrowing capacity		$ 35,000,000
Short-term borrowings			$ 0	$ 10,000,000
Line of credit | London Interbank Offered Rate (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			0.80%
Maximum | Federal Home Loan Bank advances
Short-term borrowings
Effective interest rate of amounts due within one year			1.30%

Long-Term Borrowings (Details)

Long-Term Borrowings (Details) - USD ($) $ in Thousands	Aug. 24, 2016	Jun. 30, 2017	Dec. 31, 2016
Long-term borrowings
Weighted Average Interest Rate		2.19%	1.64%
Amount		$ 330,160	$ 311,790
Federal Home Loan Bank advances		$ 231,400	$ 230,900
London Interbank Offered Rate (LIBOR)
Long-term borrowings
Basis spread on variable rate	1.75%
Federal Home Loan Bank advances
Long-term borrowings
Weighted Average Interest Rate		1.48%	0.85%
Amount		$ 231,417	$ 230,865
Notes payable
Long-term borrowings
Weighted Average Interest Rate		3.99%	4.18%
Amount		$ 86,743	$ 66,925
Notes payable to banks
Long-term borrowings
Weighted Average Interest Rate		4.24%
Amount		$ 71,500	66,900
Equipment pledged as collateral		$ 85,900	$ 79,600
Other secured borrowings
Long-term borrowings
Weighted Average Interest Rate		2.81%
Amount		$ 15,200
Unsecured term
Long-term borrowings
Weighted Average Interest Rate		2.97%	2.52%
Amount	$ 16,000	$ 12,000	$ 14,000
Quarterly principal payments	$ 1,000
Minimum | Federal Home Loan Bank advances
Long-term borrowings
Interest rate		1.35%
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		6 Months Ended
		Jun. 30, 2017	Dec. 31, 2016
Junior Subordinated Notes
Principal balance		$ 211,085	$ 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%
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%
MB Financial Capital Trust II | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.40%
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%
MB Financial Capital Trust III | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.50%
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%
MB Financial Capital Trust IV | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.52%
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%
MB Financial Capital Trust V | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.30%
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%
MB Financial Capital Trust VI | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.30%
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%
FOBB Statutory Trust III | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate	[1]	2.80%
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%
TAYC Capital Trust II
Investment Owned, Balance [Abstract]
Purchase accounting adjustments discount		$ 6,600
TAYC Capital Trust II | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate	[2]	2.68%
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%
American Chartered Statutory Trust I | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate	[3]	3.60%
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%
American Chartered Statutory Trust II | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate	[3]	2.75%
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%
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 $6.6 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	6 Months Ended
	Jun. 30, 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	$ (34,000)
Dollar amount of letters of credit outstanding	153,100	$ 187,200
Letters of credit issued or renewed	16,100
Capital expenditure commitments outstanding	3,600
Home equity lines
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	224,881	235,279
Other commitments
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	3,862,382	3,679,259
Standby
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	152,646	185,386
Commercial
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	$ 488	$ 1,766

Commitments and Contingencies71

Commitments and Contingencies (Details 2)	6 Months Ended
	Jun. 30, 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	20.00%

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		$ 1,567,071	$ 1,696,195
Loans held for sale		718,916	716,883
Loans		13,465,064	12,605,726
Mortgage servicing rights		249,688	238,011
Derivative financial instruments		16,141	22,833
Derivative financial instruments		32,439	53,497
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		23,229	23,415
States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		387,351	391,365
Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		917,605	983,684
Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		89,326	93,008
Corporate bonds
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		138,556	193,895
Equity securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		11,004	10,828
Recurring basis
Financial assets and financial liabilities measured at fair value on a recurring basis
Loans held for sale		718,916	716,883
Loans		14,867	16,273
Assets held in trust for deferred compensation		19,202	18,723
Other liabilities	[1]	19,202	18,723
Derivative financial instruments		40,131	63,885
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		23,229	23,415
Recurring basis | States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		387,351	391,365
Recurring basis | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		917,605	983,684
Recurring basis | Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		89,326	93,008
Recurring basis | Corporate bonds
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		138,556	193,895
Recurring basis | Equity securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		11,004	10,828
Recurring basis | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Mortgage servicing rights		249,688	238,011
Recurring basis | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative financial instruments		37,948	44,586
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		11,004	10,828
Loans held for sale		0	0
Loans		0	0
Assets held in trust for deferred compensation		19,202	18,723
Derivative financial instruments		3,055	7,687
Other liabilities	[1]	19,202	18,723
Derivative financial instruments		1,870	2,046
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government sponsored agencies and enterprises
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		11,004	10,828
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Mortgage servicing rights		0	0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative financial instruments		3,055	7,687
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		1,555,605	1,684,823
Loans held for sale		718,916	716,883
Loans		14,867	16,273
Assets held in trust for deferred compensation		0	0
Derivative financial instruments		32,194	33,739
Other liabilities	[1]	0	0
Derivative financial instruments		38,261	61,839
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		23,229	23,415
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		386,978	390,992
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		917,516	983,513
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		89,326	93,008
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		138,556	193,895
Recurring basis | Significant Other Observable Inputs (Level 2) | Equity securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		0	0
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Mortgage servicing rights		0	0
Recurring basis | Significant Other Observable Inputs (Level 2) | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative financial instruments		32,194	33,739
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		462	544
Loans held for sale		0	0
Loans		0	0
Assets held in trust for deferred compensation		0	0
Derivative financial instruments		2,699	3,160
Other liabilities	[1]	0	0
Derivative financial instruments		0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | U.S. Government sponsored agencies and enterprises
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		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	373
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		89	171
Recurring basis | Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Corporate bonds
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Equity securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Mortgage servicing rights		249,688	238,011
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		$ 2,699	$ 3,160
[1]	Liabilities associated with assets held in trust for deferred compensation

Fair Value Measurements (Deta73

Fair Value Measurements (Details 2) - USD ($)	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale	$ 1,567,071,000	$ 1,696,195,000
Mortgage servicing rights	249,688,000	238,011,000
Derivative financial instruments	16,141,000	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	387,351,000	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	917,605,000	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	387,351,000	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	917,605,000	983,684,000
Recurring basis | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Mortgage servicing rights	249,688,000	238,011,000
Recurring basis | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative financial instruments	37,948,000	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	462,000	544,000
Derivative financial instruments	2,699,000	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	$ 89,000	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	249,688,000	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	$ 2,699,000	$ 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)	6.80%
Discount rate	9.53%
Maturity (months)	322 months
Delinquencies	1.97%
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	0.9878%
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)	8.60%
Discount rate	11.05%
Maturity (months)	357 months
Delinquencies	4.61%
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	1.0844%

Fair Value Measurements (Deta74

Fair Value Measurements (Details 3) - Mortgage servicing rights	6 Months Ended
	Jun. 30, 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	$ (8,174,000)
Impact on fair value of 20% adverse change, CPR	(15,901,000)
Impact on fair value of 10% adverse change, discount rate	(10,565,000)
Impact on fair value of 20% adverse change, discount rate	(20,309,000)
Impact on fair value of 10% adverse change, delinquency rate	(2,091,000)
Impact on fair value of 20% adverse change, delinquency rate	(3,914,000)
Impact on fair value of 10% adverse change, costs to service	(4,665,000)
Impact on fair value of 20% adverse change, costs to service	$ (9,330,000)
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	7.70%
Weighted average discount rate	9.81%
Weighted average delinquency rate	4.40%
Weighted average costs to service	$ 89

Fair Value Measurements (Deta75

Fair Value Measurements (Details 4) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 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	(82)	(117)
Sales	0	0
Balance, ending of period	462	656
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	786	2,961
Originations	27,568	25,043
Included in earnings	(16,677)	(61,197)
Principal payments	0	0
Sales	0	0
Balance, ending of period	249,688	134,969
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	(461)	8,852
Principal payments	0	0
Sales	0	0
Balance, ending of period	$ 2,699	$ 12,674

Fair Value Measurements (Deta76

Fair Value Measurements (Details 5) - Nonrecurring basis - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financial Assets:
Impaired loans	$ 53,385	$ 54,576
Foreclosed assets	16,396	31,607
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets:
Impaired loans	0	0
Foreclosed assets	0	0
Significant Other Observable Inputs (Level 2)
Financial Assets:
Impaired loans	0	0
Foreclosed assets	0	0
Significant Unobservable Inputs (Level 3)
Financial Assets:
Impaired loans	53,385	54,576
Foreclosed assets	$ 16,396	$ 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 ($) $ in Thousands	6 Months Ended
	Jun. 30, 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	$ 348,550	$ 364,783
Interest earning deposits with banks	115,707	98,686
Investment securities available for sale	1,567,071	1,696,195
Investment securities held to maturity	1,061,044	1,093,740
Non-marketable securities - FHLB and FRB stock	160,204	143,276
Loans held for sale	718,916	716,883
Derivative financial instruments	16,141	22,833
Financial Liabilities:
Non-interest bearing deposits	6,388,292	6,408,169
Interest bearing deposits	7,873,527	7,702,279
Short-term borrowings	1,993,358	1,569,288
Junior subordinated notes issued to capital trusts	211,085	210,668
Derivative financial instruments	32,439	53,497
Carrying Amount
Financial Assets:
Cash and due from banks	348,550	364,783
Interest earning deposits with banks	115,707	98,686
Investment securities available for sale	1,567,071	1,696,195
Investment securities held to maturity	1,022,912	1,069,750
Non-marketable securities - FHLB and FRB stock	160,204	143,276
Loans held for sale	718,916	716,883
Loans, net	13,460,108	12,629,437
Accrued interest receivable	59,675	59,024
Derivative financial instruments	37,948	44,586
Financial Liabilities:
Non-interest bearing deposits	6,388,292	6,408,169
Interest bearing deposits	7,873,527	7,702,279
Short-term borrowings	1,993,358	1,569,288
Long-term borrowings	330,160	311,790
Junior subordinated notes issued to capital trusts	211,085	210,668
Accrued interest payable	5,495	4,288
Derivative financial instruments	40,131	63,885
Estimated Fair Value
Financial Assets:
Cash and due from banks	348,550	364,783
Interest earning deposits with banks	115,707	98,686
Investment securities available for sale	1,567,071	1,696,195
Investment securities held to maturity	1,061,044	1,093,740
Non-marketable securities - FHLB and FRB stock	160,204	143,276
Loans held for sale	718,916	716,883
Loans, net	13,736,459	12,747,107
Accrued interest receivable	59,675	59,024
Derivative financial instruments	37,948	44,586
Financial Liabilities:
Non-interest bearing deposits	6,388,292	6,408,169
Interest bearing deposits	7,868,383	7,698,839
Short-term borrowings	1,993,656	1,569,314
Long-term borrowings	335,643	317,028
Junior subordinated notes issued to capital trusts	165,727	157,098
Accrued interest payable	5,495	4,288
Derivative financial instruments	40,131	63,885
Recurring basis
Financial Assets:
Loans held for sale	718,916	716,883
Financial Liabilities:
Derivative financial instruments	40,131	63,885
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets:
Cash and due from banks	348,550	364,783
Interest earning deposits with banks	115,707	98,686
Investment securities available for sale	11,004	10,828
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	59,675	59,024
Derivative financial instruments	3,055	7,687
Financial Liabilities:
Non-interest bearing deposits	6,388,292	6,408,169
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	5,495	4,288
Derivative financial instruments	1,870	2,046
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	1,555,605	1,684,823
Investment securities held to maturity	1,061,044	1,093,740
Non-marketable securities - FHLB and FRB stock	0	0
Loans held for sale	718,916	716,883
Loans, net	14,867	16,273
Accrued interest receivable	0	0
Derivative financial instruments	32,194	33,739
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	38,261	61,839
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	462	544
Investment securities held to maturity	0	0
Non-marketable securities - FHLB and FRB stock	160,204	143,276
Loans held for sale	0	0
Loans, net	13,721,592	12,730,834
Accrued interest receivable	0	0
Derivative financial instruments	2,699	3,160
Financial Liabilities:
Non-interest bearing deposits	0	0
Interest bearing deposits	7,868,383	7,698,839
Short-term borrowings	1,993,656	1,569,314
Long-term borrowings	335,643	317,028
Junior subordinated notes issued to capital trusts	165,727	157,098
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		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 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	$ 4,443	$ 4,284	$ 8,924	$ 8,335
Amount of related income tax benefit recognized in income	$ 1,916	$ 1,671	$ 6,338	$ 3,254
Stock options
Number of Options
Outstanding, beginning balance (in shares)			1,940,405
Granted (in shares)			159,540
Exercised (in shares)			(211,770)
Expired (in shares)			0
Forfeited or cancelled (in shares)			(9,594)
Outstanding, ending balance (in shares)	1,878,581		1,878,581		1,940,405
Options exercisable (in shares)	1,238,014		1,238,014
Weighted Average Exercise Price
Outstanding, beginning balance (in dollars per share)			$ 27.45
Granted (in dollars per share)			45.54
Exercised (in dollars per share)			27.04
Expired (in dollars per share)			0
Forfeited or cancelled (in dollars per share)			31.32
Outstanding, ending balance (in dollars per share)	$ 29.01		29.01		$ 27.45
Options exercisable (in dollars per share)	$ 26.84		$ 26.84
Weighted Average Remaining Contractual Term (In Years)
Outstanding, balance (in years)			5 years 4 months 25 days		5 years 3 months 23 days
Options exercisable (in years)			3 years 10 months 18 days
Aggregate Intrinsic Value (in thousands)
Options outstanding	$ 28,501		$ 28,501
Options exercisable	$ 21,318		$ 21,318
Fair value assumptions
Risk-free interest rate			2.18%
Expected volatility of Company’s stock			22.66%
Expected dividend yield			1.67%
Expected life of options			5 years 10 months 15 days
Weighted average fair value per option of options granted during the year (in dollars per share)			$ 9.43
Restricted shares
Number of Shares and Units
Shares and units outstanding, beginning balance (in shares)			998,807
Granted (in shares)			379,335
Vested (in shares)			(331,875)
Forfeited or cancelled (in shares)			(15,293)
Shares and units outstanding, ending balance (in shares)	1,030,974		1,030,974		998,807
Weighted Average Grant Date Fair Value
Shares and units outstanding, beginning balance (in dollars per share)			$ 31.20
Granted (in dollars per share)			45.77
Vested (in dollars per share)			31.11
Forfeited or cancelled (in dollars per share)			33.42
Shares and units outstanding, ending balance (in dollars per share)	$ 36.55		$ 36.55		$ 31.20

Stock Incentive Plans (Details

Stock Incentive Plans (Details 2) - USD ($) $ in Millions	Aug. 18, 2014	May 28, 2014	Jun. 30, 2017	Jun. 30, 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)			2,912,067
Unrecognized compensation cost related to nonvested share-based compensation			$ 30.7
Period for recognition			2 years
Omnibus Incentive Plan | Taylor Capital Group, Inc.
Stock-based compensation
Total number of shares authorized (in shares)	13,800,000
Increase in amount of shares authorized (in shares)	2,400,000
Stock options
Stock-based compensation
Award requisite service period			4 years
Expiration term of options			10 years
Intrinsic value of options exercised			$ 3.9	$ 1.9
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			$ 15.5	$ 8.4
Restricted shares | Minimum
Stock-based compensation
Vesting period			2 years
Restricted shares | Maximum
Stock-based compensation
Vesting period			4 years
Restricted stock | Director
Stock-based compensation
Vesting period			1 year
Maximum percentage of directors fees with option to be received in equity based incentive awards			100.00%
Performance-based restricted stock units
Stock-based compensation
Vesting period			3 years
Restricted stock issued (in shares)			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		6 Months Ended		12 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Derivative [Line Items]
Net amount payable under interest rate swap				$ 1		$ 1
Interest rate swap credit risk exposure		$ 11,300		11,300
Asset Derivatives, Notional Amount		3,925,298		3,925,298		3,097,336
Asset Derivatives, Estimated Fair Value		37,948		37,948		44,586
Liability Derivatives, Notional Amount		2,925,309		2,925,309		3,467,875
Liability Derivatives, Estimated Fair Value		(40,131)		(40,131)		(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		2,250	$ 16,428	(5,300)	$ 42,945
Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	3,925,298		3,925,298		3,097,336
Asset Derivatives, Estimated Fair Value	[1]	37,948		37,948		44,586
Liability Derivatives, Notional Amount	[1]	2,925,226		2,925,226		3,467,768
Liability Derivatives, Estimated Fair Value	[1]	(40,129)		(40,129)		(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		2,249	16,427	(5,302)	42,943
Commercial loan interest rate swaps
Derivative [Line Items]
Liability Derivatives, Notional Amount		83		83
Interest rate swap contracts | Derivative instruments designated as hedges of fair value
Derivative [Line Items]
Asset Derivatives, Notional Amount	[2]	0		0		0
Asset Derivatives, Estimated Fair Value	[2]	0		0		0
Liability Derivatives, Notional Amount	[2]	83		83		107
Liability Derivatives, Estimated Fair Value	[2]	(2)		(2)		(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	2	2
Interest rate swap contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	1,407,132		1,407,132		1,310,057
Asset Derivatives, Estimated Fair Value	[1]	23,773		23,773		25,471
Liability Derivatives, Notional Amount	[1]	1,407,132		1,407,132		1,310,057
Liability Derivatives, Estimated Fair Value	[1]	(23,773)		(23,773)		(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		1,624	(1)	3,473	2,337
Interest rate swap contracts | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	778,000		778,000		383,000
Asset Derivatives, Estimated Fair Value	[1]	4,800		4,800		2,946
Liability Derivatives, Notional Amount	[1]	798,000		798,000		1,458,000
Liability Derivatives, Estimated Fair Value	[1]	(11,088)		(11,088)		(31,212)
Interest rate options contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	322,810		322,810		217,546
Asset Derivatives, Estimated Fair Value	[1]	1,369		1,369		881
Liability Derivatives, Notional Amount	[1]	322,810		322,810		217,546
Liability Derivatives, Estimated Fair Value	[1]	(1,369)		(1,369)		(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	(1)	0	35
Foreign exchange contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	37,701		37,701		40,641
Asset Derivatives, Estimated Fair Value	[1]	2,163		2,163		4,429
Liability Derivatives, Notional Amount	[1]	37,254		37,254		40,505
Liability Derivatives, Estimated Fair Value	[1]	(1,991)		(1,991)		(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		197	371	260	499
Spot foreign exchange contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	7,137		7,137		1,691
Asset Derivatives, Estimated Fair Value	[1]	89		89		12
Liability Derivatives, Notional Amount	[1]	6,030		6,030		660
Liability Derivatives, Estimated Fair Value	[1]	(38)		(38)		(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		729	(2)	1,407	301
Treasury futures contracts | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	27,500		27,500		15,500
Asset Derivatives, Estimated Fair Value	[1]	96		96		41
Liability Derivatives, Notional Amount	[1]	35,000		35,000		0
Liability Derivatives, Estimated Fair Value	[1]	(288)		(288)		0
TBA mortgage securities | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	0		0		0
Asset Derivatives, Estimated Fair Value	[1]	0		0		0
Liability Derivatives, Notional Amount	[1]	110,000		110,000		55,000
Liability Derivatives, Estimated Fair Value	[1]	(940)		(940)		(132)
Forward loan sale commitments | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	742,000		742,000		585,000
Asset Derivatives, Estimated Fair Value	[1]	2,959		2,959		7,646
Liability Derivatives, Notional Amount	[1]	209,000		209,000		386,000
Liability Derivatives, Estimated Fair Value	[1]	(642)		(642)		(1,915)
Interest rate lock commitments | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	603,018		603,018		543,901
Asset Derivatives, Estimated Fair Value	[1]	2,699		2,699		3,160
Liability Derivatives, Notional Amount	[1]	0		0		0
Liability Derivatives, Estimated Fair Value	[1]	0		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		$ (301)	$ 16,060	$ (10,442)	$ 39,771
[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	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	$ 16,141	$ 22,833
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	16,141	22,833
Financial Liabilities, Gross Amount Recognized	32,439	53,497
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	32,439	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	203,358	237,538
Repurchase Agreements, Financial Liabilities, Gross Amount Offset	0	0
Repurchase Agreements, Financial Liabilities, Net Amount Recognized	203,358	237,538
Total Financial Assets, Gross Amount Recognized	16,141	22,833
Total Financial Assets, Gross Amount Offset	0	0
Total Financial Assets, Net Amount Recognized	16,141	22,833
Total Financial Liabilities, Gross Amount Recognized	235,797	291,035
Total Financial Liabilities, Gross Amount Offset	0	0
Total Financial Liabilities, Net Amount Recognized	235,797	291,035
Interest rate swap contracts, caps and floors
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	7,291	7,885
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	7,291	7,885
Financial Liabilities, Gross Amount Recognized	17,950	18,564
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	17,950	18,564
Foreign exchange contracts
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	995	4,315
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	995	4,315
Financial Liabilities, Gross Amount Recognized	1,531	1,674
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	1,531	1,674
Mortgage related derivatives
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	7,855	10,633
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	7,855	10,633
Financial Liabilities, Gross Amount Recognized	12,958	33,259
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	$ 12,958	$ 33,259

Derivative Financial Instrume82

Derivative Financial Instruments (Details 3) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Financial Assets, Net Amount Recognized	$ 16,141	$ 22,833
Financial Assets, Financial Instruments	(13,789)	(18,382)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	2,352	4,451
Financial Liabilities, Net Amount Recognized	32,439	53,497
Financial Liabilities, Financial Instruments	(13,789)	(18,382)
Financial Liabilities, Collateral	(18,633)	(35,104)
Financial Liabilities, Net Amount	17	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	203,358	237,538
Repurchase Agreements, Financial Liabilities, Financial Instruments	0	0
Repurchase Agreements, Financial Liabilities, Collateral	(203,358)	(237,538)
Repurchase Agreements, Financial Liabilities, Net Amount	0	0
Total Financial Assets, Net Amount Recognized	16,141	22,833
Total Financial Assets, Financial Instruments	(13,789)	(18,382)
Total Financial Assets, Collateral	0	0
Total Financial Assets, Net Amount	2,352	4,451
Total Financial Liabilities, Net Amount Recognized	235,797	291,035
Total Financial Liabilities, Financial Instruments	(13,789)	(18,382)
Total Financial Liabilities, Collateral	(221,991)	(272,642)
Total Financial Liabilities, Net Amount	17	11
Counterparty A
Derivative [Line Items]
Financial Assets, Net Amount Recognized	2,807	2,697
Financial Assets, Financial Instruments	(2,807)	(2,697)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	0	0
Financial Liabilities, Net Amount Recognized	9,218	18,768
Financial Liabilities, Financial Instruments	(2,807)	(2,697)
Financial Liabilities, Collateral	(6,411)	(16,071)
Financial Liabilities, Net Amount	0	0
Counterparty B
Derivative [Line Items]
Financial Assets, Net Amount Recognized	2,206	4,683
Financial Assets, Financial Instruments	(2,206)	(4,683)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	0	0
Financial Liabilities, Net Amount Recognized	7,759	12,881
Financial Liabilities, Financial Instruments	(2,206)	(4,683)
Financial Liabilities, Collateral	(5,553)	(8,198)
Financial Liabilities, Net Amount	0	0
Counterparty C
Derivative [Line Items]
Financial Assets, Net Amount Recognized	247	64
Financial Assets, Financial Instruments	(247)	(64)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	0	0
Financial Liabilities, Net Amount Recognized	2,679	4,919
Financial Liabilities, Financial Instruments	(247)	(64)
Financial Liabilities, Collateral	(2,432)	(4,855)
Financial Liabilities, Net Amount	0	0
Other counterparties
Derivative [Line Items]
Financial Assets, Net Amount Recognized	10,881	15,389
Financial Assets, Financial Instruments	(8,529)	(10,938)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	2,352	4,451
Financial Liabilities, Net Amount Recognized	12,783	16,929
Financial Liabilities, Financial Instruments	(8,529)	(10,938)
Financial Liabilities, Collateral	(4,237)	(5,980)
Financial Liabilities, Net Amount	$ 17	$ 11

Operating Segments (Details)

Operating Segments (Details) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2017USD ($)		Jun. 30, 2016USD ($)		Jun. 30, 2017USD ($)segment		Jun. 30, 2016USD ($)		Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of reportable operating segments | segment					3
Net interest income	$ 148,994		$ 122,602		$ 292,037		$ 241,906
Provision for credit losses	9,699		2,829		13,433		10,392
Non-interest income	90,517		92,000		182,290		173,693
Non-interest expense	165,559	[1]	147,906	[1]	321,224	[2]	283,706	[2]
Income tax expense	19,787		20,455		40,667		38,975
Net income	44,466		43,412		99,003		82,526
Total assets	19,965,057		15,995,790		19,965,057		15,995,790		$ 19,302,317
Taylor Capital Group, Inc.
Segment Reporting Information [Line Items]
Pretax merger related costs	7,200		2,600		7,400		5,900
Banking
Segment Reporting Information [Line Items]
Net interest income	135,982		112,152		267,431		221,760
Provision for credit losses	8,890		2,995		12,417		9,996
Non-interest income	42,838		36,668		85,369		71,687
Non-interest expense	116,369	[1]	99,882	[1]	224,208	[2]	190,522	[2]
Income tax expense	15,662		13,350		31,322		27,700
Net income	37,899		32,593		84,853		65,229
Total assets	16,320,111		13,296,238		16,320,111		13,296,238
Leasing
Segment Reporting Information [Line Items]
Net interest income	2,345		2,411		4,614		4,834
Provision for credit losses	410		(356)		275		81
Non-interest income	18,180		15,717		39,643		34,912
Non-interest expense	13,436	[1]	11,126	[1]	27,280	[2]	23,312	[2]
Income tax expense	2,525		2,879		6,644		6,388
Net income	4,154		4,479		10,058		9,965
Total assets	1,275,386		1,081,723		1,275,386		1,081,723
Mortgage Banking
Segment Reporting Information [Line Items]
Net interest income	10,667		8,039		19,992		15,312
Provision for credit losses	399		190		741		315
Non-interest income	29,499		39,615		57,278		67,094
Non-interest expense	35,754	[1]	36,898	[1]	69,736	[2]	69,872	[2]
Income tax expense	1,600		4,226		2,701		4,887
Net income	2,413		6,340		4,092		7,332
Total assets	$ 2,369,560		$ 1,617,829		$ 2,369,560		$ 1,617,829
[1]	Includes merger related and repositioning expenses of $7.2 million and $2.6 million in the Banking Segment for the three months ended June 30, 2017 and 2016, respectively.
[2]	Includes merger related and repositioning expenses of $7.4 million and $5.9 million in the Banking Segment for the six months ended June 30, 2017 and 2016, respectively.

Preferred Stock (Details)

Preferred Stock (Details)	Aug. 24, 2016$ / sharesshares	Aug. 18, 2014$ / sharesshares	Dec. 31, 2016$ / sharesshares	Jun. 30, 2017$ / sharesshares	Dec. 31, 2016$ / sharesshares
Series A Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)			4,000,000	4,000,000	4,000,000
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares			$ 25	$ 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)		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)			125	125	125
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares			$ 1,000	$ 1,000	$ 1,000
Preferred stock, dividend rate (percent)				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%
Conversion of preferred stock to common stock (in shares)			400
Series D Preferred Stock | American Chartered Merger
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)	525