MB Financial 10-Q 9 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Nov. 09, 2016
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	Sep. 30, 2016
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		83,577,088
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks	$ 351,009	$ 307,869
Interest earning deposits with banks	125,250	73,572
Total cash and cash equivalents	476,259	381,441
Investment securities:
Securities available for sale, at fair value	1,859,356	1,585,023
Securities held to maturity, at amortized cost ($1,175,838 fair value at September 30, 2016 and $1,274,767 at December 31, 2015)	1,115,262	1,230,810
Non-marketable securities - FHLB and FRB stock	146,209	114,233
Total investment securities	3,120,827	2,930,066
Loans held for sale	899,412	744,727
Loans:
Total loans, excluding purchased credit impaired loans	12,379,358	9,652,592
Purchased credit impaired loans	161,338	141,406
Total loans	12,540,696	9,793,998
Less: Allowance for loan and lease losses	139,528	128,140
Net loans	12,401,168	9,665,858
Lease investments, net	277,647	211,687
Premises and equipment, net	283,112	236,013
Cash surrender value of life insurance	199,628	136,953
Goodwill	993,799	725,070
Other intangibles	65,395	44,812
Mortgage servicing rights, at fair value	154,730	168,162
Other real estate owned, net	33,105	31,553
Other real estate owned related to FDIC-assisted transactions	5,177	10,717
Other assets	431,623	297,948
Total assets	19,341,882	15,585,007
Deposits:
Non-interest bearing	6,410,334	4,627,184
Interest bearing	7,868,932	6,878,031
Total deposits	14,279,266	11,505,215
Short-term borrowings	1,496,319	1,005,737
Long-term borrowings	311,645	400,274
Junior subordinated notes issued to capital trusts	209,159	186,164
Accrued expenses and other liabilities	482,085	400,333
Total liabilities	16,778,474	13,497,723
STOCKHOLDERS’ EQUITY
Preferred stock, ($0.01 par value, authorized 10,000,000 shares at September 30, 2016 and December 31, 2015; Series A, 8% perpetual non-cumulative, 4,000,000 shares issued and outstanding at September 30, 2016 and December 31, 2015, $25 liquidation value; Series B, 8% cumulative voting convertible, 525 shares issued and outstanding at September 30, 2016 and none issued and outstanding at December 31, 2015)	116,507	115,280
Common stock, ($0.01 par value; authorized 120,000,000 shares at September 30, 2016 and 100,000,000 shares at December 31, 2015; issued 85,547,217 shares at September 30, 2016 and 75,566,885 shares at December 31, 2015)	855	756
Additional paid-in capital	1,674,341	1,280,870
Retained earnings	809,769	731,812
Accumulated other comprehensive income	23,763	15,777
Less: 1,991,960 and 1,888,556 shares of treasury common stock, at cost, at September 30, 2016 and December 31, 2015, respectively	(62,084)	(58,504)
Controlling interest stockholders’ equity	2,563,151	2,085,991
Non-controlling interest	257	1,293
Total stockholders’ equity	2,563,408	2,087,284
Total liabilities and stockholders’ equity	$ 19,341,882	$ 15,585,007

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Securities held to maturity, at amortized cost, fair value	$ 1,175,838	$ 1,274,767
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	100,000,000
Common stock, issued shares	85,547,217	75,566,885
Treasury stock, shares	1,991,960	1,888,556
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%
Preferred stock, shares issued	525	0
Preferred stock, shares outstanding	525	0

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2016		Sep. 30, 2015		Sep. 30, 2016	Sep. 30, 2015
Loans:
Taxable	$ 118,675		$ 100,573		$ 333,829	$ 298,187
Nontaxable	2,846		2,283		8,173	6,716
Investment securities:
Taxable	8,844		9,655		26,209	29,591
Nontaxable	10,382		10,752		31,802	30,005
Other interest earning accounts	164		89		430	208
Total interest income	140,911		123,352		400,443	364,707
Interest expense:
Deposits	6,681		5,102		18,255	14,301
Short-term borrowings	1,092		395		2,723	1,027
Long-term borrowings and junior subordinated notes	2,367		1,886		6,788	5,542
Total interest expense	10,140		7,383		27,766	20,870
Net interest income	130,771		115,969		372,677	343,837
Provision for credit losses	6,549		5,358		16,941	14,628
Net interest income after provision for credit losses	124,222		110,611		355,736	329,209
Non-interest income:
Mortgage banking revenue	49,095		30,692		116,192	90,884
Lease financing revenue, net	18,864		20,000		53,618	60,644
Commercial deposit and treasury management fees	12,957		11,472		36,383	33,572
Trust and asset management fees	8,244		6,002		24,430	17,468
Card fees	4,161		3,335		11,731	11,671
Capital markets and international banking fees	3,313		2,357		9,311	5,793
Consumer and other deposit service fees	3,559		3,499		9,745	9,842
Brokerage fees	1,294		1,281		3,767	4,502
Loan service fees	1,792		1,531		5,505	4,369
Increase in cash surrender value of life insurance	1,055		852		2,759	2,527
Net gain (loss) on investment securities	0		371		269	(173)
Net gain (loss) on sale of assets	5		1		(45)	(2)
Other operating income	4,048		858		8,415	5,371
Total non-interest income	108,387		82,251		282,080	246,468
Non-interest expenses:
Salaries and employee benefits	111,478		87,891		292,073	258,822
Occupancy and equipment	14,766		12,458		41,441	37,575
Computer services and telecommunication	12,836		8,567		31,668	26,008
Advertising and marketing	3,084		2,578		8,926	7,521
Professional and legal	4,460		1,801		10,370	6,884
Other intangibles amortization	1,674		1,542		4,917	4,569
Branch exit and facilities impairment charges	(2,908)		70		(2,709)	7,899
Net (gain) loss recognized on other real estate owned and other related expenses	(721)		577		(809)	2,197
Prepayment fees on interest bearing liabilities	0		0		0	85
Other operating expenses	25,716		18,782		68,214	55,363
Total non-interest expenses	170,385	[1]	134,266	[1]	454,091	406,923	[2]
Income before income taxes	62,224		58,596		183,725	168,754
Income tax expense	17,805		18,318		56,780	53,413
Net income	44,419		40,278		126,945	115,341
Dividends on preferred shares	2,004		2,000		6,004	6,000
Net income available to common stockholders	$ 42,415		$ 38,278		$ 120,941	$ 109,341
Common share data:
Basic earnings per common share (in dollars per share)	$ 0.55		$ 0.52		$ 1.62	$ 1.47
Diluted earnings per common share (in dollars per share)	$ 0.54		$ 0.51		$ 1.60	$ 1.45
Weighted average common shares outstanding for basic earnings per common share (in shares)	77,506,885		74,297,281		74,780,943	74,478,164
Diluted weighted average common shares outstanding for diluted earnings per common share (in shares)	78,683,170		75,029,827		75,727,580	75,154,585
[1]	Includes merger related and repositioning expenses of $11.4 million and $389 thousand in the Banking Segment for the three months ended September 30, 2016 and 2015, respectively.
[2]	Includes merger related and repositioning expenses of $17.2 million and $9.6 million in the Banking Segment for the nine months ended September 30, 2016 and 2015, respectively.

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 44,419	$ 40,278	$ 126,945	$ 115,341
Unrealized holding (losses) gains on investment securities, net of reclassification adjustments	(7,679)	4,989	15,603	3,507
Reclassification adjustment for amortization of unrealized gains on investment securities transferred to held to maturity from available for sale	(554)	(1,010)	(2,081)	(2,669)
Reclassification adjustments for (gains) losses included in net income	0	(371)	(269)	173
Other comprehensive (loss) income, before tax	(8,233)	3,608	13,253	1,011
Income tax benefit (expense) related to items of other comprehensive (loss) income	3,265	(1,418)	(5,267)	(399)
Other comprehensive (loss) income, net of tax	(4,968)	2,190	7,986	612
Comprehensive income	$ 39,451	$ 42,468	$ 134,931	$ 115,953

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	Noncontrolling Interest
Beginning balance at Dec. 31, 2014	$ 2,028,286	$ 115,280	$ 751	$ 1,267,761	$ 629,677	$ 20,356	$ (6,974)	$ 1,435
Increase (Decrease) in Stockholders' Equity
Net income	115,552				115,341			211
Other comprehensive income, net of tax	612					612
Issuance of common stock	218			218
Cash dividends declared on preferred shares	(6,000)				(6,000)
Cash dividends declared on common shares ($0.48 and $0.55 per share in 2015 and 2016, respectively)	(36,229)				(36,229)
Restricted common stock activity, net of tax	1,040		5	(1,841)			2,876
Stock option activity, net of tax	(133)			(133)
Repurchase of common shares	(47,215)						(47,215)
Repurchase of common shares in connection with employee benefit plans and held in trust for deferred compensation plan	(3,585)			360			(3,945)
Stock-based compensation expense	10,983			10,983
Distributions to non-controlling interest	(301)							(301)
Ending balance at Sep. 30, 2015	2,063,228	115,280	756	1,277,348	702,789	20,968	(55,258)	1,345
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	127,084				126,945			139
Other comprehensive income, net of tax	7,986					7,986
Issuance of common stock	385,099	1,227	97	383,775
Cash dividends declared on preferred shares	(6,004)				(6,004)
Cash dividends declared on common shares ($0.48 and $0.55 per share in 2015 and 2016, respectively)	(42,984)				(42,984)
Restricted common stock activity, net of tax	(1,512)		1	(2,263)			750
Stock option activity, net of tax	116		1	272			(157)
Repurchase of common shares in connection with employee benefit plans and held in trust for deferred compensation plan	(3,792)			381			(4,173)
Stock-based compensation expense	12,573			12,573
Purchase of additional investment in subsidiary from minority owners	(2,336)			(1,267)				(1,069)
Distributions to non-controlling interest	(106)							(106)
Ending balance at Sep. 30, 2016	$ 2,563,408	$ 116,507	$ 855	$ 1,674,341	$ 809,769	$ 23,763	$ (62,084)	$ 257

CONSOLIDATED STATEMENTS OF CHA7

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.55	$ 0.48

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash Flows From Operating Activities
Net income	$ 126,945	$ 115,341
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment and leased equipment	55,259	45,550
Branch exit and facilities impairment charges	(2,709)	7,899
Compensation expense for share-based payment plans	12,573	10,983
Net (gain) loss on sales of premises and equipment and leased equipment	(255)	1,800
Amortization of other intangibles	4,917	4,569
Provision for credit losses	16,941	14,628
Deferred income tax expense	26,208	13,521
Amortization of premiums and discounts on investment securities, net	34,968	35,441
Accretion of discounts on loans, net	(25,426)	(26,365)
Accretion of FDIC indemnification asset	0	(72)
Net (gain) loss on investment securities	(269)	173
Proceeds from sale of loans held for sale	4,601,291	5,500,778
Origination of loans held for sale	(4,694,890)	(5,450,842)
Net gain on sale of loans held for sale	(41,518)	(25,449)
Change in fair value of mortgage servicing rights	59,894	40,568
Net (gain) loss on other real estate owned	(1,823)	2,070
Net loss (gain) on other real estate owned related to FDIC-assisted transactions	448	(296)
Increase in cash surrender value of life insurance	(2,759)	(2,527)
Increase in other assets, net	(162,260)	(120,160)
Increase (decrease) in other liabilities, net	22,618	(8,576)
Net cash provided by operating activities	30,153	159,034
Cash Flows From Investing Activities
Proceeds from sales of investment securities available for sale	19,023	28,356
Proceeds from maturities and calls of investment securities available for sale	212,283	206,378
Purchases of investment securities available for sale	(19,905)	(148,374)
Proceeds from maturities and calls of investment securities held to maturity	115,040	61,521
Purchases of investment securities held to maturity	(12,690)	(295,857)
Purchases of non-marketable securities - FHLB and FRB stock	(15,999)	(35,831)
Redemption of non-marketable securities - FHLB and FRB stock	23	20,000
Net increase in loans	(780,864)	(248,219)
Purchases of mortgage servicing rights	(3,423)	(785)
Proceeds from sale of mortgage servicing rights	0	103,105
Purchases of premises and equipment and leased equipment	(125,372)	(64,149)
Proceeds from sales of premises and equipment and leased equipment	5,194	3,993
Capital improvements on other real estate owned	(96)	0
Proceeds from sale of other real estate owned	8,081	3,153
Proceeds from sale of other real estate owned related to FDIC-assisted transactions	7,105	9,674
Net cash paid in business acquisition	(9,010)	0
Purchase of additional investment in subsidiary from minority owners	(2,336)	0
Net proceeds from FDIC related covered assets	(3,182)	(6,831)
Net cash used in investing activities	(606,128)	(363,866)
Cash Flows From Financing Activities
Net increase in deposits	384,628	263,636
Net increase in short-term borrowings	442,277	9,114
Proceeds from long-term borrowings	182,247	27,159
Principal paid on long-term borrowings	(286,877)	(14,900)
Treasury stock transactions, net	(3,792)	(50,800)
Stock options exercised	1,062	499
Excess tax expense from share-based payment arrangements	0	241
Dividends paid on preferred stock	(6,004)	(6,000)
Dividends paid on common stock	(42,748)	(35,953)
Net cash provided by financing activities	670,793	192,996
Net increase (decrease) in cash and cash equivalents	94,818	(11,836)
Cash and cash equivalents:
Beginning of period	381,441	312,081
End of period	476,259	300,245
Cash payments for:
Interest paid to depositors and on other borrowed funds	26,952	21,656
Income tax payments, net	4,576	(4,958)
Supplemental Schedule of Noncash Investing Activities:
Investment securities available for sale sold not settled	(9,741)	0
Investment securities held to maturity purchased not settled	440	11,656
Loans held for sale transferred to loans held for investment	0	44,078
Loans transferred to other real estate owned	3,566	15,612
Loans transferred to other real estate owned related to FDIC-assisted transactions	1,145	3,221
Loans transferred to repossessed assets	2,796	777
Operating leases rewritten as direct finance leases included as loans	642	6,940
Noncash assets acquired:
Investment securities available for sale	505,564	0
Non-marketable securities - FHLB and FRB stock	16,000	0
Loans	1,952,826	0
Premises and equipment	39,061	0
Cash surrender value of life insurance	59,917	0
Goodwill	268,729	0
Core deposit intangible	25,500	0
Other real estate owned	4,148	0
Other assets	27,615	0
Total noncash assets acquired	2,899,360	0
Liabilities assumed:
Deposits	2,389,423	0
Short-term borrowings	48,305	0
Long-term borrowings	16,000	0
Junior subordinated notes issued to capital trusts	28,075	0
Other liabilities	23,477	0
Total liabilities assumed	$ 2,505,280	$ 0

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation These unaudited consolidated financial statements include the accounts of MB Financial, Inc., a Maryland corporation (the “Company”), and its subsidiaries, including its wholly owned national bank subsidiary, MB Financial Bank, N.A. (“MB Financial Bank”), based in Chicago, Illinois. In the opinion of management, all normal recurring adjustments necessary for a fair presentation of the financial condition, results of operations and cash flows for the interim periods have been made. The results of operations for the nine months ended September 30, 2016 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, 2015 . 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	9 Months Ended
	Sep. 30, 2016
Accounting Changes and Error Corrections [Abstract]
New Authoritative Accounting Guidance	New Authoritative Accounting Guidance ASC Topic 810 "Consolidation." New authoritative accounting guidance under ASC Topic 810, "Consolidation" amended prior guidance over the consolidation of certain legal entities. The new authoritative guidance modifies the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, eliminates the presumption that a general partner should consolidate a limited partnership, affects the consolidation analysis of reporting entities that are involved with variable interest entities and provides a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements similar to those for registered money market funds. The Company adopted this new authoritative guidance on January 1, 2016, and it did not have an impact on the Company's statements of operations or financial condition. ASC Topic 835 "Interest." New authoritative accounting guidance under ASC Topic 835, "Interest" amended prior guidance to simplify the presentation of debt issuance costs. The new authoritative guidance requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The Company adopted this new authoritative guidance on January 1, 2016, and it did not have an impact on the Company's statements of operations or financial condition. ASC Topic 805 "Business Combinations." New authoritative accounting guidance under ASC Topic 805, "Business Combinations" amended prior guidance to require that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The new guidance requires that the acquirer record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. It also requires an entity to present separately on the face of the statement of operations or disclose in the notes the portion of the amount recorded in current-period earnings by line items that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. The Company adopted this new authoritative guidance on January 1, 2016, and it did not have an 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 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 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. 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 new authoritative guidance will be effective for reporting periods after January 1, 2017 and early adoption is permitted. 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 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 new authoritative guidance will be effective for reporting periods after January 1, 2017 and early adoption is permitted. This new authoritative guidance is not expected to 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 new authoritative guidance will be effective for reporting periods after January 1, 2017 and early adoption is permitted. This new authoritative guidance is not expected to have a significant impact on the Company's statements of operations or financial condition. ASC Topic 718 "Compensation - Stock Compensation." New authoritative accounting guidance under ASC Topic 718 "Compensation - Stock Compensation" amended prior guidance on several aspects, including the income tax consequences, classification of awards as either equity or liability, and classification on the statement of cash flows. The new authoritative guidance allows for all excess tax benefits and tax deficiencies to be recognized as income tax benefit or expense in the income statement. The tax effects of exercised or vested awards should be treated as discrete items in the reporting period in which they occur. An entity also should recognize excess tax benefits regardless of whether the benefit reduces taxes payable in the current period. For the statement of cash flows, excess tax benefits should be classified along with other income tax cash flows as an operating activity, and cash paid by an employer when directly withholding shares for tax withholding purposes should be classified as a financing activity. The new authoritative guidance also allows an entity to make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures when they occur. In addition, the threshold to qualify for equity classification permits withholding up to the maximum statutory tax rates in the applicable jurisdictions. The new authoritative guidance will be effective for reporting periods after January 1, 2017 and early adoption is permitted. The Company early adopted the new guidance in the third quarter of 2016, and as a result, recorded a $1.8 million tax benefit in the Company's statements of operations. 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 its impact on the Company's statements of operations or financial condition. 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. 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.

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share Earnings per common share is computed using the two-class method. Basic earnings per common share is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding during the applicable period, excluding outstanding participating securities. Participating securities include non-vested restricted stock awards and restricted stock units, though no actual shares of common stock related to restricted stock units are issued until the settlement of such units, to the extent holders of these securities receive non-forfeitable dividends or dividend equivalents at the same rate as holders of the Company's common stock. Diluted earnings per common share is computed using the weighted-average number of shares determined for the basic earnings per common share computation plus the dilutive effect of stock compensation using the treasury stock method. The following table presents a reconciliation of the number of shares used in the calculation of basic and diluted earnings per common share (amounts in thousands, except share and per share data). Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Distributed earnings allocated to common stock $ 16,114 $ 12,733 $ 42,984 $ 36,227 Undistributed earnings 28,305 27,545 83,961 79,114 Net income 44,419 40,278 126,945 115,341 Less: preferred stock dividends 2,004 2,000 6,004 6,000 Net income available to common stockholders for basic earnings per common share 42,415 38,278 120,941 109,341 Plus: preferred stock dividends on convertible preferred stock 4 — 4 — Less: earnings allocated to participating securities 2 2 6 5 Earnings allocated to common stockholders for diluted earnings per common share $ 42,417 $ 38,276 $ 120,939 $ 109,336 Weighted average shares outstanding for basic earnings per common share 77,506,885 74,297,281 74,780,943 74,478,164 Dilutive effect of equity awards 1,176,285 732,546 946,637 676,421 Weighted average shares outstanding for diluted earnings per common share 78,683,170 75,029,827 75,727,580 75,154,585 Basic earnings per common share $ 0.55 $ 0.52 $ 1.62 $ 1.47 Diluted earnings per common share 0.54 0.51 1.60 1.45

Business Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2016
Business Combinations [Abstract]
Business Combinations	Business Combinations MSA, Holding, LLC On December 31, 2015, MB Financial Bank acquired a 100% equity interest in MSA Holdings, LLC, ("MSA") the parent company of MainStreet Investment Advisors, LLC and Cambium Asset Management, LLC. Main Street Advisors provides investment management solutions to the bank trust and independent trust company markets. Through its registered investment advisor, Cambium LLC, MSA provides efficient, cost-effective account management solutions on a discretionary basis for high net worth clients, both individuals and institutions, and small accounts through its BluePrint portfolio solution. This business combination was accounted for under the acquisition method of accounting. Accordingly, the results of operations of the acquired company were included in the Company’s results of operations starting on January 1, 2016. Under this method of accounting, assets and liabilities acquired are recorded at their estimated fair values, net of applicable income tax effects. The excess cost over fair value of net assets acquired was recorded as goodwill. The Company recorded $13.5 million in goodwill and $8.8 million in other intangibles as a result of this acquisition. The amounts recognized for the business combination in the financial statements as of June 30, 2016 were determined to be final. American Chartered Bancorp, Inc. Effective August 24, 2016, American Chartered Bancorp, Inc. ("American Chartered"), an Illinois corporation, was merged (the "Merger") with and into MB Financial, Inc., a Maryland corporation ("MB Financial"), pursuant to the Agreement and Plan of Merger, dated as of November 20, 2015 (the "Merger Agreement"), by and between MB Financial and American Chartered. This transaction continues to solidify the Company's market position in Chicago. At the effective time of the Merger (the "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 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 Effective Time whose holder elected pursuant to American Chartered’s charter 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 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 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 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 Agreement and Plan of Merger. 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 $268.8 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. The amounts recognized for the business combination in the financial statements as of September 30, 2016 have been determined only provisionally as fair values continue to be assessed. 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 1,952,826 Premises and equipment 39,061 Cash surrender value of life insurance 59,917 Goodwill 268,758 Other intangibles 25,500 Other real estate owned 4,148 Other assets 27,615 Total assets $ 2,992,696 LIABILITIES Deposits $ 2,389,423 Short-term borrowings 48,305 Long-term borrowings 16,000 Junior subordinated notes issued to capital trusts 28,075 Accrued expenses and other liabilities 23,477 Total liabilities $ 2,505,280 Total identifiable net assets $ 487,416 Consideration: Market value of common stock at $39.28 per share at August 24, 2016 (9,744,636 shares of common stock issued) $ 382,769 Series B preferred stock at $2,337.97 per share at August 24, 2016 (525 shares of preferred stock issued) (1) 1,227 Stock-based compensation attributed to pre-business combination service 1,103 Cash paid 102,317 Total fair value of consideration, excluding Series B preferred stock $ 487,416 (1) Per share fair value amount determined as if the shares of Series B were converted into shares common stock. Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date without a carryover of the related allowance for loan and lease losses. These acquired loans are segregated into three types: pass rated loans with no discount attributable to credit quality, non-impaired loans with a discount attributable at least in part to credit quality and impaired loans with evidence of significant credit deterioration. • Pass rated loans (typically performing loans) are accounted for in accordance with ASC 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 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 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 $29.0 million as of the date of the acquisition. In accordance with ASC 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 $4.3 million and $805 thousand , 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 $ 24,575 $ 1,928,251 Gross contractual amounts receivable 31,408 2,207,765 Best estimate of contractual cash flows not expected to be collected (1) 5,048 129,027 Best estimate of contractual cash flows expected to be collected 26,360 2,078,738 (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 default. The Company incurred costs of $1.8 million directly related to the consummation of the merger for the nine months ended September 30, 2016, which is 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 nine months ended September 30, 2016 and 2015, as if the acquisition had occurred January 1, 2015. 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, 2015. 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 Nine Months Ended September 30, September 30, 2016 2015 2016 2015 (in thousands) Total revenues (net interest income plus non-interest income) $ 256,866 $ 228,099 $ 731,987 $ 678,735 Net income 48,432 50,581 147,078 141,751 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	9 Months Ended
	Sep. 30, 2016
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 September 30, 2016 Available for Sale U.S. Government sponsored agencies and enterprises $ 53,456 $ 512 $ — $ 53,968 States and political subdivisions 383,041 27,914 (218 ) 410,737 Residential mortgage-backed securities 1,066,834 10,948 (1,445 ) 1,076,337 Commercial mortgage-backed securities 93,962 3,203 (172 ) 96,993 Corporate bonds 208,940 2,167 (914 ) 210,193 Equity securities 10,932 196 — 11,128 Total Available for Sale 1,817,165 44,940 (2,749 ) 1,859,356 Held to Maturity States and political subdivisions 939,491 53,682 (33 ) 993,140 Residential mortgage-backed securities 175,771 6,927 — 182,698 Total Held to Maturity 1,115,262 60,609 (33 ) 1,175,838 Total $ 2,932,427 $ 105,549 $ (2,782 ) $ 3,035,194 December 31, 2015 Available for Sale U.S. Government sponsored agencies and enterprises $ 63,805 $ 806 $ — $ 64,611 States and political subdivisions 373,285 23,083 (1 ) 396,367 Residential mortgage-backed securities 759,816 7,363 (3,630 ) 763,549 Commercial mortgage-backed securities 128,509 1,839 (241 ) 130,107 Corporate bonds 222,784 815 (3,971 ) 219,628 Equity securities 10,757 4 — 10,761 Total Available for Sale 1,558,956 33,910 (7,843 ) 1,585,023 Held to Maturity States and political subdivisions 1,016,519 36,874 (638 ) 1,052,755 Residential mortgage-backed securities 214,291 7,721 — 222,012 Total Held to Maturity 1,230,810 44,595 (638 ) 1,274,767 Total $ 2,789,766 $ 78,505 $ (8,481 ) $ 2,859,790 The Company has no direct exposure to the State of Illinois, but approximately 21% of the state and political subdivisions portfolio consisted of securities issued by municipalities located in Illinois as of September 30, 2016 . Approximately 97% of the state and political subdivisions securities were general obligation issues, and 48% were insured or had another form of credit enhancement as of September 30, 2016 . Unrealized losses on investment securities by length of time in a continuous unrealized loss position and the fair value of the related securities at September 30, 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 $ 20,526 $ (218 ) $ — $ — $ 20,526 $ (218 ) Residential mortgage-backed securities 374,312 (1,214 ) 27,699 (231 ) 402,011 (1,445 ) Commercial mortgage-backed securities 71 (1 ) 11,664 (171 ) 11,735 (172 ) Corporate bonds 9,834 (155 ) 19,950 (759 ) 29,784 (914 ) Total Available for Sale 404,743 (1,588 ) 59,313 (1,161 ) 464,056 (2,749 ) Held to Maturity States and political subdivisions 31,142 (32 ) 387 (1 ) 31,529 (33 ) Total $ 435,885 $ (1,620 ) $ 59,700 $ (1,162 ) $ 495,585 $ (2,782 ) 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, 2015 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 $ 219 $ (1 ) $ — $ — $ 219 $ (1 ) Residential mortgage-backed securities 357,877 (2,835 ) 43,566 (795 ) 401,443 (3,630 ) Commercial mortgage-backed securities 2,324 (5 ) 11,809 (236 ) 14,133 (241 ) Corporate bonds 73,774 (1,164 ) 18,286 (2,807 ) 92,060 (3,971 ) Total Available for Sale 434,194 (4,005 ) 73,661 (3,838 ) 507,855 (7,843 ) Held to Maturity States and political subdivisions 66,152 (519 ) 6,190 (119 ) 72,342 (638 ) Total $ 500,346 $ (4,524 ) $ 79,851 $ (3,957 ) $ 580,197 $ (8,481 ) The total number of security positions in the investment portfolio in an unrealized loss position at September 30, 2016 was 271 compared to 193 at December 31, 2015 . This increase in total number of security positions in a continuous unrealized loss position from December 31, 2015 to September 30, 2016 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 September 30, 2016 , management does not have the intent to sell any of the securities in the table above at September 30, 2016 and believes that it is more likely than not that the Company will not have to sell any such securities before a recovery of cost. The fair value is expected to recover as the securities approach their maturity date or repricing date or if market yields for such investments decline. Accordingly, as of September 30, 2016 , management believes the impairments detailed in the table above at September 30, 2016 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 (losses) recognized on investment securities available for sale were as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Realized gains $ — $ 371 $ 323 $ 1,454 Realized losses — — (54 ) (1,627 ) Net gains (losses) $ — $ 371 $ 269 $ (173 ) The amortized cost and fair value of investment securities as of September 30, 2016 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 $ 81,215 $ 81,620 Due after one year through five years 267,485 273,115 Due after five years through ten years 44,899 46,964 Due after ten years 251,838 273,199 Equity securities 10,932 11,128 Residential and commercial mortgage-backed securities 1,160,796 1,173,330 1,817,165 1,859,356 Held to maturity: Due in one year or less 87,409 87,524 Due after one year through five years 146,995 151,557 Due after five years through ten years 159,780 171,871 Due after ten years 545,307 582,188 Residential mortgage-backed securities 175,771 182,698 1,115,262 1,175,838 Total $ 2,932,427 $ 3,035,194 Investment securities with a carrying amount of $1.2 billion at September 30, 2016 and $1.4 billion at December 31, 2015 were pledged as collateral on public deposits and for other purposes as required or permitted by law, while only $839.3 million and $878.2 million were required to be pledged at September 30, 2016 and December 31, 2015 , respectively. Of those pledged, the Company had investment securities pledged as collateral for advances from the Federal Home Loan Bank of $108.8 million at December 31, 2015 and none were pledged at September 30, 2016 .

Loans

Loans	9 Months Ended
	Sep. 30, 2016
Receivables [Abstract]
Loans	Loans Loans consist of the following at (in thousands): September 30, December 31, Commercial loans $ 4,385,812 $ 3,616,286 Commercial loans collateralized by assignment of lease payments 1,873,380 1,779,072 Commercial real estate 3,794,801 2,695,676 Residential real estate 998,827 628,169 Construction real estate 451,023 252,060 Indirect vehicle 522,271 384,095 Home equity 275,288 216,573 Other consumer loans 77,956 80,661 Total loans, excluding purchased credit-impaired loans 12,379,358 9,652,592 Purchased credit-impaired loans 161,338 141,406 Total loans $ 12,540,696 $ 9,793,998 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 the markets serviced by MB Financial Bank. 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. 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, they 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 loans accounted for under ASC 310-30, which include purchased credit-impaired loans acquired through a business combination, 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 September 30, 2016 and December 31, 2015 , the Company had $4.9 billion and $3.2 billion , respectively, of loans pledged as collateral for long-term Federal Home Loan Bank advances and third party letters of credit, while only $3.1 billion and $2.2 billion were required to be pledged at September 30, 2016 and December 31, 2015 , respectively. The following table presents the contractual aging of the recorded investment in past due loans by class of loans as of September 30, 2016 and December 31, 2015 (in thousands): Current 30-59 Days 60-89 Days Loans Past Due Total Total September 30, 2016 Commercial $ 4,376,819 $ 2,649 $ 104 $ 6,240 $ 8,993 $ 4,385,812 Commercial collateralized by assignment of lease payments 1,855,322 12,141 4,672 1,245 18,058 1,873,380 Commercial real estate: Healthcare 572,228 — — — — 572,228 Industrial 854,045 298 1,289 — 1,587 855,632 Multifamily 549,486 141 366 113 620 550,106 Retail 522,696 333 235 453 1,021 523,717 Office 416,965 1,336 49 — 1,385 418,350 Other 871,881 1,646 532 709 2,887 874,768 Residential real estate 986,386 2,347 1,739 8,355 12,441 998,827 Construction real estate 451,023 — — — — 451,023 Indirect vehicle 518,881 2,301 716 373 3,390 522,271 Home equity 270,028 1,475 490 3,295 5,260 275,288 Other consumer 77,570 166 129 91 386 77,956 Total loans, excluding purchased credit-impaired loans 12,323,330 24,833 10,321 20,874 56,028 12,379,358 Purchased credit-impaired loans 92,346 1,108 5,848 62,036 68,992 161,338 Total loans $ 12,415,676 $ 25,941 $ 16,169 $ 82,910 $ 125,020 $ 12,540,696 Non-performing loan aging $ 31,009 $ 373 $ 1,801 $ 20,726 $ 22,900 $ 53,909 December 31, 2015 Commercial $ 3,586,372 $ 22,956 $ 97 $ 6,861 $ 29,914 $ 3,616,286 Commercial collateralized by assignment of lease payments 1,758,839 3,399 5,902 10,932 20,233 1,779,072 Commercial real estate: Healthcare 476,939 — — — — 476,939 Industrial 400,182 — — 757 757 400,939 Multifamily 399,333 622 88 934 1,644 400,977 Retail 410,958 6,189 7,411 180 13,780 424,738 Office 223,935 58 — 5,189 5,247 229,182 Other 760,530 622 82 1,667 2,371 762,901 Residential real estate 612,573 5,193 1,729 8,674 15,596 628,169 Construction real estate 252,060 — — — — 252,060 Indirect vehicle 380,899 2,085 698 413 3,196 384,095 Home equity 207,818 1,774 1,398 5,583 8,755 216,573 Other consumer 80,225 254 84 98 436 80,661 Total loans, excluding purchased credit-impaired loans 9,550,663 43,152 17,489 41,288 101,929 9,652,592 Purchased credit-impaired loans 81,250 3,311 4,439 52,406 60,156 141,406 Total loans $ 9,631,913 $ 46,463 $ 21,928 $ 93,694 $ 162,085 $ 9,793,998 Non-performing loan aging $ 44,290 $ 9,827 $ 9,367 $ 41,177 $ 60,371 $ 104,661 The following table presents the recorded investment in non-accrual loans and loans past due ninety days or more and still accruing by class of loans, excluding purchased credit-impaired loans, as of September 30, 2016 and December 31, 2015 (in thousands): September 30, 2016 December 31, 2015 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 $ 8,583 $ 1,166 $ 24,689 $ 42 Commercial collateralized by assignment of lease payments 4,996 153 7,027 5,318 Commercial real estate: Healthcare — — — — Industrial 278 — 1,136 — Multifamily 2,648 — 3,415 — Office 447 — 4,496 693 Retail 607 — 17,594 — Other 531 144 1,544 195 Residential real estate 16,781 220 17,951 253 Construction real estate — — — — Indirect vehicle 1,955 — 2,046 — Home equity 15,300 — 18,156 — Other consumer 9 91 11 95 Total $ 52,135 $ 1,774 $ 98,065 $ 6,596 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. Risk ratings are updated any time the situation warrants and at least annually. Loans listed as not rated are included in groups of homogeneous loans with similar risk and loss characteristics. The following tables present the risk category of loans by class of loans based on the most recent analysis performed, excluding purchased credit-impaired loans, as of September 30, 2016 and December 31, 2015 (in thousands): Pass Special Substandard Doubtful Total September 30, 2016 Commercial $ 4,163,243 $ 131,163 $ 91,406 $ — $ 4,385,812 Commercial collateralized by assignment of lease payments 1,859,012 5,504 8,864 — 1,873,380 Commercial real estate: Healthcare 555,166 17,062 — — 572,228 Industrial 831,090 23,751 791 — 855,632 Multifamily 546,183 312 3,611 — 550,106 Retail 514,299 8,646 772 — 523,717 Office 409,124 5,086 4,140 — 418,350 Other 828,578 26,085 20,105 — 874,768 Construction real estate 451,023 — — — 451,023 Total $ 10,157,718 $ 217,609 $ 129,689 $ — $ 10,505,016 December 31, 2015 Commercial $ 3,373,943 $ 115,548 $ 126,795 $ — $ 3,616,286 Commercial collateralized by assignment of lease payments 1,760,674 4,367 14,031 — 1,779,072 Commercial real estate: Healthcare 472,599 4,340 — — 476,939 Industrial 380,200 19,011 1,728 — 400,939 Multifamily 396,117 595 4,265 — 400,977 Retail 393,543 13,310 17,885 — 424,738 Office 216,584 3,797 8,801 — 229,182 Other 730,713 6,193 25,995 — 762,901 Construction real estate 252,060 — — — 252,060 Total $ 7,976,433 $ 167,161 $ 199,500 $ — $ 8,343,094 Approximately $18.1 million and $59.6 million of the substandard loans were non-performing as of September 30, 2016 and December 31, 2015 , respectively. For residential real estate, home equity, indirect vehicle and other consumer loan classes, which are not rated, the Company evaluates credit quality based on the aging status of the loan, which was previously presented, and by payment activity. The following table presents the recorded investment in those loan classes based on payment activity, excluding purchased credit-impaired loans, as of September 30, 2016 and December 31, 2015 (in thousands): Performing Non-performing Total September 30, 2016 Residential real estate $ 981,826 $ 17,001 $ 998,827 Indirect vehicle 520,316 1,955 522,271 Home equity 259,988 15,300 275,288 Other consumer 77,856 100 77,956 Total $ 1,839,986 $ 34,356 $ 1,874,342 December 31, 2015 Residential real estate $ 609,965 $ 18,204 $ 628,169 Indirect vehicle 382,049 2,046 384,095 Home equity 198,417 18,156 216,573 Other consumer 80,555 106 80,661 Total $ 1,270,986 $ 38,512 $ 1,309,498 The recorded investment in residential mortgage loans secured by residential real estate properties for which foreclosure proceedings are in process totaled $23.6 million and $20.8 million at September 30, 2016 and December 31, 2015 , respectively. The following tables present loans individually evaluated for impairment by class of loans, excluding purchased credit-impaired loans, as of September 30, 2016 and December 31, 2015 (in thousands): September 30, 2016 Three Months Ended Nine Months Ended Unpaid Recorded Partial Allowance for Average Interest Average Interest With no related allowance recorded: Commercial $ 1,808 $ 1,808 $ — $ — $ 1,871 $ — $ 2,377 $ — Commercial collateralized by assignment of lease payments 1,161 794 367 — 1,141 27 1,026 27 Commercial real estate: Healthcare — — — — — — — — Industrial — — — — — — 536 — Multifamily 1,981 1,981 — — 2,334 — 2,362 — Retail 2,683 943 1,740 — 949 — 2,577 — Office — — — — — — 342 — Other — — — — — — 80 — Residential real estate — — — — — — — — Construction real estate — — — — — — — — Indirect vehicle 218 125 93 — 277 — 292 — Home equity — — — — — — 192 — Other consumer — — — — — — — — With an allowance recorded: Commercial 17,476 17,476 — 5,401 19,180 — 26,513 — Commercial collateralized by assignment of lease payments 7,260 7,260 — 3,933 5,086 — 3,201 18 Commercial real estate: Healthcare — — — — — — — — Industrial — — — — — — — — Multifamily — — — — — — — — Retail 3,606 3,606 — 363 3,612 — 7,911 — Office — — — — — — 995 — Other — — — — — — 314 — Residential real estate 15,117 13,268 1,849 2,394 13,325 — 13,068 — Construction real estate — — — — — — — — Indirect vehicle — — — — — — — — Home equity 29,688 27,276 2,412 3,252 27,443 — 28,635 — Other consumer — — — — — — — — Total $ 80,998 $ 74,537 $ 6,461 $ 15,343 $ 75,218 $ 27 $ 90,421 $ 45 December 31, 2015 Year Ended Unpaid Recorded Partial Allowance for Average Interest With no related allowance recorded: Commercial $ 11,253 $ 11,253 $ — $ — $ 6,628 $ — Commercial collateralized by assignment of lease payments 3,453 2,949 504 — 1,035 54 Commercial real estate: Healthcare — — — — — — Industrial 820 757 63 — 3,467 — Multifamily 575 575 — — 1,540 17 Retail 7,872 6,131 1,741 — 2,768 — Office 1,608 1,031 577 — 1,663 — Other — — — — 965 — Residential real estate 970 970 — — 717 — Construction real estate — — — — — — Indirect vehicle — — — — — — Home equity 927 927 — — 1,000 — Other consumer — — — — — — With an allowance recorded: Commercial 23,394 23,394 — 7,523 18,820 — Commercial collateralized by assignment of lease payments 3,297 3,297 — 1,790 4,013 104 Commercial real estate: Healthcare — — — — — — Industrial — — — — 228 — Multifamily 2,155 2,155 — 17 3,307 27 Retail 16,034 16,034 — 4,926 8,885 — Office 2,929 2,929 — 1,717 2,457 — Other 592 592 — 199 9,629 — Residential real estate 12,950 12,769 181 2,634 13,484 — Construction real estate — — — — 214 — Indirect vehicle 119 119 — — 287 — Home equity 28,696 28,583 113 3,131 27,747 — Other consumer — — — — — — Total $ 117,644 $ 114,465 $ 3,179 $ 21,937 $ 108,854 $ 202 Impaired loans included accruing restructured loans of $28.6 million and $27.0 million that have been modified and are performing in accordance with those modified terms as of September 30, 2016 and December 31, 2015 , respectively. In addition, impaired loans included $23.4 million and $23.6 million of non-performing restructured loans as of September 30, 2016 and December 31, 2015 , respectively. Loans may be restructured in an effort to maximize collections from financially distressed borrowers. We use various restructuring techniques, including, but not limited to, deferring past due interest or principal, implementing an A/B note structure, redeeming past due taxes, reducing interest rates, extending maturities and modifying amortization schedules. Residential real estate loans are restructured in an effort to minimize losses while allowing borrowers to remain in their primary residences when possible. Programs that we offer to residential real estate borrowers include the Home Affordable Refinance Program (“HARP”), a restructuring program similar to the Home Affordable Modification Program (“HAMP”) for first mortgage borrowers, the Second Lien Modification Program (“2MP”) and similar programs for home equity borrowers in keeping with the restructuring techniques discussed above. Periodically, the Company will restructure a note into two separate notes (A/B structure), charging off the entire B portion of the note. The A note is structured with appropriate loan-to-value and cash flow coverage ratios that provide for a high likelihood of repayment. The A note is classified as a non-performing note until the borrower has displayed a historical payment performance for a reasonable time prior to and subsequent to the restructuring. A period of sustained repayment for at least six months generally is required to return the note to accrual status provided that management has determined that the performance is reasonably expected to continue. The A note will be classified as a restructured note (either performing or non-performing) through the calendar year of the restructuring that the historical payment performance has been established. As of September 30, 2016 and December 31, 2015 , there was one A/B structure with a recorded investment of $943 thousand and $1.0 million , respectively, which is included above as an accruing restructured loan. A loan classified as a troubled debt restructuring will no longer be included in the troubled debt restructuring disclosures in the years after the restructuring if the loan performs in accordance with the terms specified by the restructuring agreement and the interest rate specified in the restructuring agreement represents a market rate at the time of modification. The specified interest rate is considered a market rate when the interest rate is equal to or greater than the rate the Company is willing to accept at the time of restructuring for a new loan with comparable risk. If there are concerns that the borrower will not be able to meet the modified terms of the loan, the loan will continue to be included in the troubled debt restructuring disclosures. Impairment analyses on commercial-related loans classified as troubled debt restructurings are performed in conjunction with the normal allowance for loan and lease losses process. Consumer loans classified as troubled debt restructurings are aggregated in two pools that share common risk characteristics, home equity and residential real estate loans, with impairment measured on a quarterly basis based on the present value of expected future cash flows discounted at the loan's effective interest rate. The following table presents loans that were restructured during the three months ended September 30, 2016 (dollars in thousands): September 30, 2016 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Residential real estate 2 $ 101 $ 101 $ 18 Home equity 2 102 102 12 Total 4 $ 203 $ 203 $ 30 Non-Performing: Commercial 3 $ 5,874 $ 5,874 $ 1,490 Residential real estate 4 484 484 85 Indirect vehicle 7 34 34 17 Home equity 5 489 489 72 Total 19 $ 6,881 $ 6,881 $ 1,664 The following table presents loans that were restructured during the nine months ended September 30, 2016 (dollars in thousands): September 30, 2016 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Commercial 1 $ 1,870 $ 1,870 $ 412 Residential real estate 2 101 101 18 Home equity 4 511 511 12 Total 7 $ 2,482 $ 2,482 $ 442 Non-Performing: Commercial 7 $ 14,481 $ 14,481 $ 4,990 Residential real estate 6 639 639 85 Indirect vehicle 25 183 183 60 Home equity 28 3,600 3,600 138 Total 66 $ 18,903 $ 18,903 $ 5,273 The following table presents loans that were restructured during the three months ended September 30, 2015 (dollars in thousands): September 30, 2015 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Home equity 4 $ 477 $ 477 $ — Total 4 $ 477 $ 477 $ — Non-Performing: Indirect vehicle 7 $ 45 $ 45 $ 16 Home equity 4 550 550 8 Total 11 $ 595 $ 595 $ 24 The following table presents loans that were restructured during the nine months ended September 30, 2015 (dollars in thousands): September 30, 2015 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Commercial 1 $ 80 $ 80 $ — Home equity 16 4,290 4,290 — Total 17 $ 4,370 $ 4,370 $ — Non-Performing: Commercial real estate: Multifamily 1 $ 334 $ 334 $ — Residential real estate 1 140 140 17 Indirect vehicle 13 75 75 23 Home equity 9 1,348 1,348 130 Total 24 $ 1,897 $ 1,897 $ 170 Of the troubled debt restructurings entered into during the past twelve months, $224 thousand subsequently defaulted during the nine months ended September 30, 2016 . Performing troubled debt restructurings are considered to have defaulted when they become 90 days or more past due post-restructuring or are placed on non-accrual status. The following table presents the troubled debt restructurings activity during the nine months ended September 30, 2016 (in thousands): Performing Non-performing Beginning balance $ 26,991 $ 23,619 Additions 2,482 18,903 Charge-offs — (1,046 ) Principal payments, net (2,145 ) (8,695 ) Removals (1,655 ) (6,384 ) Transfer to other real estate owned — (112 ) Transfers in 3,677 789 Transfers out (789 ) (3,677 ) Ending balance $ 28,561 $ 23,397 Loans removed from troubled debt restructuring status are those that were restructured in a previous calendar year at a market rate of interest and have performed in compliance with the modified terms. The following table presents the type of modification for loans that have been restructured during the nine months ended September 30, 2016 (in thousands): September 30, 2016 Extended Maturity, Delay in Amortization Extended Payments or and Reduction Maturity and/or Reduction of of Interest Rate Amortization Interest Rate Total Commercial $ — $ 14,481 $ 1,870 $ 16,351 Commercial collateralized by assignment of lease payments — — — — Commercial real estate: Healthcare — — — — Industrial — — — — Multifamily — — — — Retail — — — — Office — — — — Other — — — — Residential real estate 484 256 — 740 Construction real estate — — — — Indirect vehicle — — 183 183 Home equity 3,220 820 71 4,111 Other consumer — — — — Total $ 3,704 $ 15,557 $ 2,124 $ 21,385 The following table presents the activity in the allowance for credit losses, balance in allowance for credit losses and recorded investment in loans by portfolio segment and based on impairment method as of September 30, 2016 and 2015 (in thousands): Commercial Commercial collateralized by assignment of lease payments Commercial real estate Residential real estate Construction real estate Indirect vehicle Home equity Other consumer Unfunded commitments Total September 30, 2016 Allowance for credit losses: Three Months Ended Beginning balance $ 50,297 $ 10,549 $ 46,040 $ 4,800 $ 14,230 $ 3,100 $ 4,199 $ 2,399 $ 2,719 $ 138,333 Charge-offs 1,341 367 529 290 7 838 376 409 — 4,157 Recoveries 665 3 324 45 50 436 65 86 — 1,674 Provision (3,894 ) 2,944 1,239 1,575 2,033 598 2,309 (407 ) 152 6,549 Ending balance $ 45,727 $ 13,129 $ 47,074 $ 6,130 $ 16,306 $ 3,296 $ 6,197 $ 1,669 $ 2,871 $ 142,399 Nine 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 2,126 3,288 2,601 1,134 151 2,420 1,233 1,216 — 14,169 Recoveries 1,997 520 2,761 151 94 1,400 576 620 — 8,119 Provision 6,540 5,463 1,439 1,379 1,250 1,898 (520 ) (11 ) (497 ) 16,941 Ending balance $ 45,727 $ 13,129 $ 47,074 $ 6,130 $ 16,306 $ 3,296 $ 6,197 $ 1,669 $ 2,871 $ 142,399 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 5,401 $ 3,933 $ 363 $ 2,394 $ — $ — $ 3,252 $ — $ 737 $ 16,080 Collectively evaluated for impairment 40,161 9,196 46,235 3,736 16,249 3,296 2,945 1,669 2,134 125,621 Acquired and accounted for under ASC 310-30 (1) 165 — 476 — 57 — — — — 698 Total ending allowance balance $ 45,727 $ 13,129 $ 47,074 $ 6,130 $ 16,306 $ 3,296 $ 6,197 $ 1,669 $ 2,871 $ 142,399 Loans: Individually evaluated for impairment $ 19,284 $ 8,054 $ 6,530 $ 13,268 $ — $ 125 $ 27,276 $ — $ — $ 74,537 Collectively evaluated for impairment 4,366,528 1,865,326 3,788,271 985,559 451,023 522,146 248,012 77,956 — 12,304,821 Acquired and accounted for under ASC 310-30 (1) 22,913 — 41,286 66,698 14,131 — 13,886 2,424 — 161,338 Total ending loans balance $ 4,408,725 $ 1,873,380 $ 3,836,087 $ 1,065,525 $ 465,154 $ 522,271 $ 289,174 $ 80,380 $ — $ 12,540,696 Commercial Commercial collateralized by assignment of lease payments Commercial real estate Residential real estate Construction real estate Indirect vehicle Home equity Other consumer Unfunded commitments Total September 30, 2015 Allowance for credit losses: Three Months Ended Beginning balance $ 39,142 $ 11,268 $ 38,076 $ 6,669 $ 12,459 $ 1,909 $ 8,412 $ 2,135 $ 4,060 $ 124,130 Charge-offs 1,657 1,980 170 292 5 581 358 467 — 5,510 Recoveries 456 11 2,402 337 216 334 186 118 — 4,060 Provision 5,044 985 1,216 (868 ) 123 512 (1,490 ) 484 (648 ) 5,358 Ending balance $ 42,985 $ 10,284 $ 41,524 $ 5,846 $ 12,793 $ 2,174 $ 6,750 $ 2,270 $ 3,412 $ 128,038 Nine Months Ended Beginning balance $ 29,571 $ 9,962 $ 41,826 $ 6,646 $ 8,918 $ 1,687 $ 9,456 $ 1,960 $ 4,031 $ 114,057 Charge-offs 2,283 2,080 2,312 1,189 11 2,082 1,078 1,391 — 12,426 Recoveries 1,514 1,100 6,338 417 253 1,354 447 356 — 11,779 Provision 14,183 1,302 (4,328 ) (28 ) 3,633 1,215 (2,075 ) 1,345 (619 ) 14,628 Ending balance $ 42,985 $ 10,284 $ 41,524 $ 5,846 $ 12,793 $ 2,174 $ 6,750 $ 2,270 $ 3,412 $ 128,038 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 7,943 $ 2,618 $ 3,123 $ 2,834 $ — $ 8 $ 2,478 $ — $ 1,388 $ 20,392 Collectively evaluated for impairment 34,731 7,666 36,975 3,012 12,700 2,166 4,272 2,270 2,024 105,816 Acquired and accounted for under ASC 310-30 (1) 311 — 1,426 — 93 — — — — 1,830 Total ending allowance balance $ 42,985 $ 10,284 $ 41,524 $ 5,846 $ 12,793 $ 2,174 $ 6,750 $ 2,270 $ 3,412 $ 128,038 Loans: Individually evaluated for impairment $ 36,325 $ 6,724 $ 29,354 $ 14,233 $ — $ 131 $ 29,520 $ — $ — $ 116,287 Collectively evaluated for impairment 3,404,307 1,686,816 2,550,655 592,938 255,620 345,600 193,653 87,612 — 9,117,201 Acquired and accounted for under ASC 310-30 (1) 37,189 — 47,803 43,735 12,372 — 11,986 2,608 — 155,693 Total ending loans balance $ 3,477,821 $ 1,693,540 $ 2,627,812 $ 650,906 $ 267,992 $ 345,731 $ 235,159 $ 90,220 $ — $ 9,389,181 (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 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 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 310-30 as they display significant credit deterioration since origination. For pass rated loans (non-purchased credit-impaired loans), the difference between the estimated fair value of the loans and the principal outstanding is accreted over the remaining life of the loans. In accordance with ASC 310-30, for both purchased non-impaired loans and purchased credit-impaired loans, the loans are pooled by loan type and the difference between contractually required payments at acquisition and the cash flows expected to be collected is referred to as the non-accretable difference. Further, any excess of cash flows expected at acquisition over the estimated fair value is referred to as the accretable yield and is recognized into interest income over the remaining life of the loan pools when there is a reasonable expectation about the amount and timing of such cash flows. Substantially all of the loans acquired in transactions with the FDIC displayed at least some level of credit deterioration and as such are included as non-impaired and impaired loans as described immediately above. During the nine months ended September 30, 2016 , there was a negative provision for credit losses of $515 thousand and net charge-offs of $864 thousand in relation to purchased loans. There was $698 thousand and $2.1 million in allowance for loan and lease losses related to these purchased loans at September 30, 2016 and December 31, 2015 , respectively. The provision for credit losses and accompanying charge-offs are included in the table above. Changes in the accretable yield for loans acquired and accounted for under ASC 310-30 were as follows for the three and nine months ended September 30, 2016 and 2015 (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Balance at beginning of period $ 13,160 $ 11,456 $ 12,596 $ 7,434 Purchases 805 — 805 — Accretion (2,564 ) (1,794 ) (7,193 ) (5,541 ) Other (1) 2,523 590 7,716 8,359 Balance at end of period $ 13,924 $ 10,252 $ 13,924 $ 10,252 (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. When cash flow estimates are adjusted downward for a particular loan pool, the FDIC indemnification asset is increased. An allowance for loan and lease losses is established for the impairment of the loans. A provision for credit losses is recognized for the difference between the increase in the FDIC indemnification asset and the decrease in cash flows. When cash flow estimates are adjusted upward for a particular loan pool, the FDIC indemnification asset is decreased. The difference between the decrease in the FDIC indemnification asset and the increase in cash flows is accreted over the estimated life of the l

Goodwill and Intangibles

Goodwill and Intangibles	9 Months Ended
	Sep. 30, 2016
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 nine months ended September 30, 2016 or 2015 . The carrying amount of goodwill was $993.8 million and $725.1 million at September 30, 2016 and December 31, 2015 , respectively. The following table presents the changes in the carrying amount of goodwill for the nine months ended September 30, 2016 (in thousands): Banking Leasing Mortgage Banking Total Balance at beginning of period $ 684,430 $ 40,640 $ — $ 725,070 Goodwill from business combinations (1) 268,729 — — 268,729 Balance at end of period $ 953,159 $ 40,640 $ — $ 993,799 (1) Due to the American Chartered merger and adjustments recognized for the MSA acquisition. The Company has other intangible assets consisting of core deposit and client relationship intangibles that had a remaining weighted average amortization period of approximately thirteen years as of September 30, 2016 . The following table presents the changes during the nine months ended September 30, 2016 in the carrying amount of core deposit and client relationship intangibles, and the gross carrying amount, accumulated amortization, and net book value as of September 30, 2016 (in thousands): September 30, 2016 Balance at beginning of period $ 44,812 Amortization expense (4,917 ) Other intangibles from acquisition 25,500 Balance at end of period $ 65,395 Gross carrying amount $ 118,792 Accumulated amortization (53,397 ) Net book value $ 65,395 The following presents the estimated future amortization expense of other intangible assets (in thousands): Year ending December 31, Amount 2016 $ 2,390 2017 8,198 2018 7,456 2019 5,677 2020 5,026 Thereafter 36,648 $ 65,395

Deposits

Deposits	9 Months Ended
	Sep. 30, 2016
Banking and Thrift [Abstract]
Deposits	Deposits The composition of deposits was as follows as of September 30, 2016 and December 31, 2015 (in thousands): September 30, December 31, 2016 2015 Demand deposit accounts, non-interest bearing $ 6,410,334 $ 4,627,184 NOW, money market and interest bearing deposits 4,660,407 4,144,633 Savings accounts 1,147,900 974,555 Certificates of deposit, $250,000 or more 1,121,599 877,352 Other certificates of deposit 939,026 881,491 Total $ 14,279,266 $ 11,505,215 Certificates of deposit of $250,000 or more included $759.3 million and $500.2 million of brokered deposits at September 30, 2016 and December 31, 2015 , 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	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Short-Term Borrowings	Short-Term Borrowings Short-term borrowings were as follows as of September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016 December 31, 2015 Weighted Average Interest Rate Amount Weighted Average Interest Rate Amount Customer repurchase agreements 0.21 % $ 256,569 0.20 % $ 201,207 Federal Home Loan Bank advances 0.38 1,200,000 0.17 775,000 Federal funds purchased 0.60 39,750 0.09 4,530 Line of credit — — 2.18 25,000 Total 0.36 % $ 1,496,319 0.23 % $ 1,005,737 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 $1.2 billion and $775.0 million at September 30, 2016 and December 31, 2015 , respectively. At September 30, 2016 , the interest rate on the advances outstanding on that date had rates ranging from 0.24% to 0.40% with maturities from October 3, 2016 to June 23, 2017 . The Company has investment securities available for sale and loans pledged as collateral on this FHLB advance. See Note 5. Investment Securities and 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% . Nothing was outstanding as of September 30, 2016 , and $25.0 million was outstanding as of December 31, 2015 . The line of credit is scheduled to mature on June 30, 2017.

Long-Term Borrowings

Long-Term Borrowings	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Long-Term Borrowings	Long-Term Borrowings The Company had Federal Home Loan Bank advances with remaining contractual maturities greater than one year of $230.1 million at September 30, 2016 and $305.2 million at December 31, 2015 . As of September 30, 2016 , the advances had fixed terms with effective interest rates, net of discounts, ranging from 0.30% to 5.87% and maturities ranging from December 2017 to April 2035 . The Company has investment securities available for sale and loans pledged as collateral on these FHLB advances. See Note 5. Investment Securities and Note 6. Loans of the notes to the consolidated financial statements. The Company had notes payable to banks totaling $66.5 million and $55.0 million at September 30, 2016 and December 31, 2015 , respectively, which as of September 30, 2016 , were accruing interest at rates ranging from 2.46% to 7.40% , with a weighted average rate of 4.22% . Lease investments includes equipment with an amortized cost of $79.0 million and $65.8 million at September 30, 2016 and December 31, 2015 , respectively, that is pledged as collateral on these notes. On August 24, 2016, the Company assumed a $16.0 million unsecured term loan at the holding company level with a correspondent bank through the American Chartered merger. Interest is payable at a rate of one month LIBOR + 1.75% and matures on June 30, 2020. Principal payments of $1.0 million are due quarterly until maturity. As of September 30, 2016 , $15.0 million was outstanding. The Company had a $40.0 million 10 -year structured repurchase agreement as of December 31, 2015 , which had a fixed interest rate of 4.75% and matured in March 2016.

Junior Subordinated Notes Issue

Junior Subordinated Notes Issued to Capital Trusts	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Junior Subordinated Notes Issued to Capital Trusts	Junior Subordinated Notes Issued to Capital Trusts The Company has established statutory trusts for the sole purpose of issuing trust preferred securities and related trust common securities. The proceeds from such issuances were used by the trusts to purchase junior subordinated notes of the Company, which are the sole assets of each trust. Concurrently with the issuance of the trust preferred securities, the Company issued guarantees for the benefit of the holders of the trust preferred securities. The Company’s outstanding trust preferred securities qualify, and are treated by the Company, as Tier 2 regulatory capital. Prior to the completion of the American Chartered merger, the trust preferred securities qualified, and were treated by the Company, as Tier 1 regulatory capital. The Company owns all of the common securities of each trust. The trust preferred securities issued by each trust rank equally with the common securities in right of payment, except that if an event of default under the indenture governing the notes has occurred and is continuing, the preferred securities will rank senior to the common securities in right of payment. The table below summarizes the outstanding junior subordinated notes and the related trust preferred securities issued by each trust as of September 30, 2016 (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 $ 10,464 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 $6.8 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 $8.0 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	9 Months Ended
	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments: The Company is a party to credit-related financial instruments with off-balance-sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit, standby letters of credit and commercial letters of credit. Such commitments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the consolidated balance sheets. The Company’s exposure to credit loss is represented by the contractual amount of these commitments. The Company follows the same credit policies in making commitments as it does for on-balance-sheet instruments. At September 30, 2016 and December 31, 2015 , the following financial instruments were outstanding, the contractual amounts of which represent off-balance sheet credit risk (in thousands): Contractual Amount September 30, 2016 December 31, 2015 Commitments to extend credit: Home equity lines $ 243,331 $ 187,478 Other commitments 3,596,246 3,049,152 Letters of credit: Standby 172,737 137,945 Commercial 5,211 1,108 Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require a payment of a fee. The commitments for home equity lines of credit may expire without being drawn upon. Therefore, the total commitment amounts do not necessarily represent future cash requirements. The amount of collateral obtained, if it is deemed necessary by the Company, is based on management’s credit evaluation of the customer. The Company, in the normal course of its business, regularly offers standby and commercial letters of credit to its bank customers. Standby and commercial letters of credit are a conditional but irrevocable form of guarantee. Under letters of credit, the Company typically guarantees payment to a third party beneficiary upon the default of payment or nonperformance by the bank customer and upon receipt of complying documentation from that beneficiary. Both standby and commercial letters of credit may be issued for any length of time, but normally do not exceed a period of five years. These letters of credit may also be extended or amended from time to time depending on the bank customer’s needs. As of September 30, 2016 , 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 September 30, 2016 , the aggregate contractual amount of these letters of credit, which represents the maximum potential amount of future payments that the Company would be obligated to pay, increased $38.9 million to $177.9 million from $139.1 million at December 31, 2015 . Of the $177.9 million in commitments outstanding at September 30, 2016 , approximately $121.0 million of the letters of credit have been issued or renewed since December 31, 2015 . Letters of credit issued on behalf of bank customers may be done on either a secured or unsecured basis. If a letter credit is secured, the collateral can take various forms including bank accounts, investments, fixed assets, inventory, accounts receivable or real estate. The Company takes the same care in making credit decisions and obtaining collateral when it issues letters of credit on behalf of its customers as it does when making other types of loans. As of September 30, 2016 , the Company had approximately $7.1 million in capital expenditure commitments outstanding which relate to various projects to renovate the corporate office space and branches. Concentrations of credit risk: The majority of the loans, commitments to extend credit and standby letters of credit have been granted to customers in the Company’s market area. As of September 30, 2016 , approximately 21% of our investments in securities issued by states and political subdivisions were within the state of Illinois. We did not hold any direct exposure to the state of Illinois as of September 30, 2016 . 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	9 Months Ended
	Sep. 30, 2016
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 is not adjusted for transaction costs. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets and liabilities; it is not a forced transaction. Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact and (iv) willing to transact. ASC Topic 820 requires the use of valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets and liabilities. The income approach uses valuation techniques to convert expected future amounts, such as cash flows or earnings, to a single present value amount on a discounted basis. The cost approach is based on the amount that currently would be required to replace the service capacity of an asset (replacement cost). Valuation techniques should be consistently applied. Inputs to valuation techniques refer to the assumptions that market participants would use in pricing the asset or liability. Inputs may be observable, meaning those that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources, or unobservable, meaning those that reflect the reporting entity's own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. In that regard, ASC Topic 820 establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect a reporting entity's own assumptions about the assumptions that market participants would use in pricing an asset or liability. A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below. In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality, the Company's creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. Our valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes the Company's valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally coincides with the Company's monthly and/or quarterly valuation process. Financial Instruments Recorded at Fair Value on a Recurring Basis Securities Available for Sale . The fair values of securities available for sale are determined by quoted prices in active markets, when available, and classified as Level 1. If quoted market prices are not available, the fair value is determined by matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities and classified as Level 2. In cases where significant credit valuation adjustments are incorporated into the estimation of fair value, reported amounts are classified as Level 3. Loans Held for Sale. Residential real estate 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. Material discrepancies between the internal model and the third party validation are investigated and resolved by an internal committee. Due to the nature of the valuation inputs, mortgage servicing rights are classified in Level 3 of the fair value hierarchy. 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. We also obtain dealer quotations for these derivatives for comparative purposes to assess the reasonableness of the model valuations. In addition, we use 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. We also offer 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, which are classified as Level 3, the Company uses an external valuation model to estimate the fair value of the commitments. This model relies on unobservable, internally developed inputs that reflect management’s assumptions and specific information about each borrower transaction. The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of September 30, 2016 and December 31, 2015 , segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands): Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) September 30, 2016 Financial assets Securities available for sale: U.S Government sponsored agencies and enterprises $ 53,968 $ — $ 53,968 $ — States and political subdivisions 410,737 — 410,320 417 Residential mortgage-backed securities 1,076,337 — 1,076,132 205 Commercial mortgage-backed securities 96,993 — 96,993 — Corporate bonds 210,193 — 210,193 — Equity securities 11,128 11,128 — — Loans held for sale 899,412 — 899,412 — Loans 19,121 — 19,121 — Mortgage servicing rights 154,730 — — 154,730 Assets held in trust for deferred compensation 18,937 18,937 — — Derivative financial instruments 112,208 1,347 98,300 12,561 Financial liabilities Other liabilities (1) 18,937 18,937 — — Derivative financial instruments 70,330 6,001 64,329 — December 31, 2015 Financial assets Securities available for sale: U.S. Government sponsored agencies and enterprises $ 64,611 $ — $ 64,611 $ — States and political subdivisions 396,367 — 395,950 417 Residential mortgage-backed securities 763,549 — 763,193 356 Commercial mortgage-backed securities 130,107 — 130,107 — Corporate bonds 219,628 — 219,628 — Equity securities 10,761 10,761 — — Loans held for sale 744,727 — 744,727 — Loans 25,869 — 25,869 — Mortgage servicing rights 168,162 — — 168,162 Assets held in trust for deferred compensation 16,820 16,820 — — Derivative financial instruments 42,846 5,118 33,906 3,822 Financial liabilities Other liabilities (1) 16,333 16,333 — — Derivative financial instruments 36,974 6,050 30,924 — (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 September 30, 2016 Valuation Technique Unobservable Input Range (in thousands) States and political subdivisions $ 417 Discounted cash flows Credit assumption 50% Loss Residential mortgage-backed securities 205 Discounted cash flows Constant pre-payment rates (CPR) 1% - 3% Mortgage servicing rights 154,730 Discounted cash flows CPR 12.3% - 16.1% Discount rate 9.50 - 12.00 Maturity (months) 327 - 357 Delinquencies 0.51 - 3.86 Costs to service $ 66 - $ 160 Costs to service - delinquent $ 150 - $ 1,000 Derivative financial instruments (mortgage 12,561 Sales cash flows Expected closing ratio 70% - 95% interest rate lock commitments) Expected delivery price 98.58 bps - 109.77 bps The significant unobservable inputs used in the fair value measurement of the Company’s mortgage servicing rights include prepayment speeds, discount rates, maturities, delinquencies and cost to service. Significant increases in prepayment speeds, discount rates, delinquencies or cost to service would result in a significantly lower fair value measurement. Conversely, significant decreases in prepayment speeds, discount rates, delinquencies or costs to service would result in a significantly higher fair value measurement. With the exception of changes in delinquencies, which can change the cost to service, the unobservable inputs move independently of each other. Key economic assumptions used in the measuring of the fair value of the mortgage servicing rights and the sensitivity of the fair value to immediate adverse changes in those assumptions at September 30, 2016 are presented in the following table. This table does not take into account the derivatives used to economically hedge the mortgage servicing rights. (dollars in thousands, except for weighted average cost to service) September 30, 2016 Weighted average CPR 15.30 % Impact on fair value of 10% adverse change $ (7,917 ) Impact on fair value of 20% adverse change (15,144 ) Weighted average discount rate 9.78 % Impact on fair value of 10% adverse change $ (5,045 ) Impact on fair value of 20% adverse change (9,769 ) Weighted average delinquency rate 1.80 % Impact on fair value of 10% adverse change $ (1,329 ) Impact on fair value of 20% adverse change (2,428 ) Weighted average costs to service $ 88 Impact on fair value of 10% adverse change (2,988 ) Impact on fair value of 20% adverse change (5,976 ) The Company did not have any transfers between Level 1 and Level 2 of the fair value hierarchy during the nine months ended September 30, 2016 . The Company's policy for determining transfers between levels occurs at the end of the reporting period when circumstances in the underlying valuation criteria change and result in transfer between levels. The following table presents additional information about financial assets measured at fair value on a recurring basis for which the Company used significant unobservable inputs (Level 3): Nine Months Ended September 30, 2016 2015 2016 2015 2016 2015 (in thousands) Investment Securities Mortgage Servicing Rights Derivatives Balance, beginning of period $ 773 $ 973 $ 168,162 $ 235,402 $ 3,822 $ 5,074 Purchases — — 3,423 785 — — Originations — — 43,039 55,583 — — Included in earnings — — (59,894 ) (40,568 ) 8,739 3,088 Principal payments (151 ) (115 ) — — — — Sales — — — (103,105 ) — — Balance, ending of period $ 622 $ 858 $ 154,730 $ 148,097 $ 12,561 $ 8,162 Financial Instruments Recorded at Fair Value on a Nonrecurring Basis The Company may be required, from time to time, to measure certain financial assets and financial liabilities at fair value on a nonrecurring basis in accordance with U.S. GAAP. These include assets that are measured at the lower of cost or fair value that were recognized at fair value below cost at the end of the period. Impaired Loans. Loans for which it is probable that payment of interest and principal will not be made in accordance with the contractual terms of the loan agreement are considered impaired. Once a loan is identified as individually impaired, management measures impairment in accordance with ASC Topic 310. The fair value of impaired loans is estimated using one of several methods, including collateral value, market value of similar debt, enterprise value, liquidation value and discounted cash flows. Those impaired loans not requiring an allowance represent loans for which the fair value of the expected repayments or collateral exceed the recorded investments in such loans. In accordance with ASC Topic 820, impaired loans where an allowance is established based on the fair value of collateral require classification in the fair value hierarchy. Collateral values are estimated using Level 3 inputs based on customized discounting criteria. For a majority of impaired real estate loans where an allowance is established based on the fair value of collateral ( 100% at September 30, 2016 ), the Company obtains a current external appraisal. Other valuation techniques are used as well, including internal valuations, comparable property analysis and contractual sales information. Non-Financial Assets and Non-Financial Liabilities Recorded at Fair Value The Company has no non-financial assets or non-financial liabilities measured at fair value on a recurring basis. Certain non-financial assets and non-financial liabilities measured at fair value on a non-recurring basis include foreclosed assets and non-financial long-lived assets. Other Real Estate and Repossessed Vehicles Owned (Foreclosed Assets). Foreclosed assets, upon initial recognition, are measured and reported at fair value through a charge-off to the allowance for loan and lease losses based upon the fair value of the foreclosed asset. The fair value of foreclosed assets, upon initial recognition, are estimated using Level 3 inputs based on customized discounting criteria. Non-Financial Long-Lived Assets. Non-financial long-lived assets, when determined to be impaired, are measured and reported at fair value using Level 3 inputs based on customized discounting criteria. Assets measured at fair value on a nonrecurring basis as of September 30, 2016 and December 31, 2015 are included in the table below (in thousands): Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) September 30, 2016 Financial assets: Impaired loans $ 54,740 $ — $ — $ 54,740 Non-financial assets: Foreclosed assets 38,735 — — 38,735 December 31, 2015 Financial assets: Impaired loans $ 76,203 $ — $ — $ 76,203 Non-financial assets: Foreclosed assets 42,351 — — 42,351 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 September 30, 2016 Technique Input Range (in thousands) Impaired loans $ 54,740 Appraisal of collateral Appraisal adjustments 5% - 10% Foreclosed assets 38,735 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 following methods and assumptions were used by the Company in estimating the fair values of its other financial instruments: Cash and due from banks, interest earning deposits with banks and federal funds sold: 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. 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. 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 amounts of accrued interest receivable and payable approximate their fair values. Off-balance-sheet instruments : Fair values for the Company’s off-balance-sheet lending commitments (guarantees, letters of credit and commitments to extend credit) are based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements. The estimated fair values of financial instruments are as follows (in thousands): September 30, 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 $ 351,009 $ 351,009 $ 351,009 $ — $ — Interest earning deposits with banks 125,250 125,250 125,250 — — Investment securities available for sale 1,859,356 1,859,356 11,128 1,847,606 622 Investment securities held to maturity 1,115,262 1,175,838 — 1,175,838 — Non-marketable securities - FHLB and FRB stock 146,209 146,209 — — 146,209 Loans held for sale 899,412 899,412 — 899,412 — Loans, net 12,401,168 12,403,330 — 19,121 12,384,209 Accrued interest receivable 58,541 58,541 58,541 — — Derivative financial instruments 112,208 112,208 1,347 98,300 12,561 Financial Liabilities: Non-interest bearing deposits $ 6,410,334 $ 6,410,334 $ 6,410,334 $ — $ — Interest bearing deposits 7,868,932 7,873,233 — — 7,873,233 Short-term borrowings 1,496,319 1,496,312 — — 1,496,312 Long-term borrowings 311,645 312,974 — — 312,974 Junior subordinated notes issued to capital trusts 209,159 144,681 — — 144,681 Accrued interest payable 4,000 4,000 4,000 — — Derivative financial instruments 70,330 70,330 6,001 64,329 — December 31, 2015 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 $ 307,869 $ 307,869 $ 307,869 $ — $ — Interest earning deposits with banks 73,572 73,572 73,572 — — Investment securities available for sale 1,585,023 1,585,023 10,761 1,573,489 773 Investment securities held to maturity 1,230,810 1,274,767 — 1,274,767 — Non-marketable securities - FHLB and FRB stock 114,233 114,233 — — 114,233 Loans held for sale 744,727 744,727 — 744,727 — Loans, net 9,665,858 9,626,344 — 25,869 9,600,475 Accrued interest receivable 53,457 53,457 53,457 — — Derivative financial instruments 42,846 42,846 5,118 33,906 3,822 Financial Liabilities: Non-interest bearing deposits $ 4,627,184 $ 4,627,184 $ 4,627,184 $ — $ — Interest bearing deposits 6,878,031 6,875,411 — — 6,875,411 Short-term borrowings 1,005,737 1,005,705 — — 1,005,705 Long-term borrowings 400,274 401,539 — — 401,539 Junior subordinated notes issued to capital trusts 186,164 122,696 — — 122,696 Accrued interest payable 3,186 3,186 3,186 — — Derivative financial instruments 36,974 36,974 6,050 30,924 —

Stock Incentive Plans

Stock Incentive Plans	9 Months Ended
	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Incentive Plans	Stock Incentive Plans ASC Topic 718 requires that the grant date fair value of equity awards to employees be recognized as compensation expense over the period during which an employee is required to provide service in exchange for such award. The following table summarizes the impact of the Company’s share-based payment plans in the financial statements for the periods shown (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Total cost of share-based payment plans during the period $ 4,238 $ 3,508 $ 12,573 $ 10,983 Amount of related income tax benefit recognized in income 3,394 1,367 6,649 $ 4,288 The Company adopted the Omnibus Incentive Plan (the “Omnibus Plan”) in 1997. On May 28, 2014, the Company’s stockholders approved the third amendment and restatement of the Omnibus Plan to add 3,100,000 authorized shares for a total of 11,400,000 shares of common stock authorized to be utilized in connection with awards under the Omnibus Plan to directors, officers, and employees of the Company or any of its subsidiaries. The number of shares authorized increased by 2,400,000 to 13,800,000 upon completion of the Taylor Capital merger. Equity grants under the Omnibus Plan can be in the form of incentive stock options, non-qualified stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance units, and other stock-based awards. Shares awarded in the form of restricted stock, restricted stock units, performance shares, performance units, or other stock-based awards generally will reduce the shares available under the Omnibus Plan on a 2 -for- 1 basis. No more than 10% of the total number of authorized shares may be issued with respect to awards granted after May 28, 2014, other than stock appreciation rights, stock options and performance-based awards, which at the date of grant are scheduled to fully vest prior to three years from the date of grant (although such awards may provide scheduled vesting earlier with respect to some of such shares and for acceleration of vesting as provided in the Omnibus Plan). As of September 30, 2016 , there were 3,826,110 shares available for future grants. Prior to 2014, annual equity-based incentive awards were typically granted to selected officers and employees mid-year. In 2014, these awards began being granted in the first quarter of the year. Options are granted with an exercise price equal to no less than the market price of the Company’s shares at the date of grant; those option awards generally vest over four years of service and have 10 -year contractual terms. Restricted shares and units typically vest over a two to four year period. Equity awards may also be granted at other times throughout the year in connection with the recruitment and retention of officers and employees. Directors currently may elect, in lieu of cash, to receive up to 70% of their fees in stock options with a five year term, which are fully vested on the grant date (provided that the director may not sell the underlying shares for at least six months after the grant date), and up to 100% of their fees in restricted shares, which vest one year after the grant date. The following table summarizes changes in stock options for the nine months ended September 30, 2016 : 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, 2015 2,192,431 $ 27.77 4.44 Granted 501,538 28.86 Exercised (461,405 ) 28.98 Expired (35,791 ) 39.91 Forfeited or cancelled (33,680 ) 31.06 Options outstanding as of September 30, 2016 2,163,093 $ 27.51 5.26 $ 22,903 Options exercisable as of September 30, 2016 1,423,442 $ 26.82 3.53 $ 16,109 The fair value of each option award is estimated on the date of grant using the Black-Scholes option pricing model based on certain assumptions. Expected volatility is based on historical volatility and the expectations of future volatility of Company shares. The risk free interest rate for periods within the contractual term of the option is based on the U.S. Treasury yield curve in effect at the time of the grant. The expected life of options is estimated based on historical employee behavior and represents the period of time that options granted are expected to remain outstanding. The following assumptions were used for options granted during the nine months ended September 30, 2016 : September 30, 2016 Risk-free interest rate 1.44 % Expected volatility of Company’s stock 28.17 % Expected dividend yield 2.21 % Expected life of options 5.6 years Weighted average fair value per option of options granted during the year $ 6.64 The total intrinsic value of options exercised during the nine months ended September 30, 2016 and 2015 was $3.6 million and $1.3 million , respectively. The following is a summary of changes in restricted shares and units for the nine months ended September 30, 2016 : Number of Shares and Units Weighted Average Grant Date Fair Value Shares and units outstanding at December 31, 2015 945,506 $ 29.92 Granted 482,739 31.19 Vested (405,633 ) 28.37 Forfeited or cancelled (23,824 ) 29.95 Shares and units outstanding at September 30, 2016 998,788 31.17 The total intrinsic value of restricted shares that vested during the nine months ended September 30, 2016 and 2015 was $15.7 million and $11.3 million , respectively. The Company issued 80,780 , 71,560 and 48,569 market-based restricted stock units in 2016, 2015 and 2014, 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 issued 56,752 market-based restricted stock units in 2013 that vested in 2016. Recipients earned shares totaling 175% 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 of issuance. As of September 30, 2016 , there was $25.4 million of total unrecognized compensation cost related to nonvested share-based compensation arrangements (including share option and nonvested share awards) granted under the Omnibus Plan. At September 30, 2016 , the weighted-average period over which the unrecognized compensation expense is expected to be recognized was approximately 2.4 years.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The Company offers various derivatives, including interest rate swaps and foreign currency forward contracts, to its qualifying customers which can mitigate our exposure to market risk through the execution of off-setting positions with inter-bank dealer counterparties. This also permits the Company to offer customized risk management solutions to our customers. These customer accommodations and any offsetting financial contracts are treated as non-designated derivative instruments and carried at fair value through an adjustment to the statement of operations. Interest rate swap and foreign currency forward contracts involve the risk of dealing with counterparties and their ability to meet contractual terms. The net amount payable or receivable under interest rate swaps is accrued as an adjustment to interest income. The net amount payable as of September 30, 2016 was approximately $1 thousand , and the net amount payable as of December 31, 2015 was approximately $1 thousand . The Company's credit exposure on interest rate swaps is limited to the Company's net favorable value and interest payments of all swaps to each counterparty. In such cases, collateral is generally required from the counterparties involved if the net value of the swaps exceeds a nominal amount. At September 30, 2016 , the Company’s credit exposure relating to interest rate swaps was approximately $45.8 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 $119 thousand at September 30, 2016 . For fair value hedges, the changes in fair values of both the hedging derivative and the hedged item were recorded in current earnings as other income. Interest rate swaps, swaptions and treasury futures are used in order to lessen the price volatility of the mortgage servicing rights asset. The Company also uses forward commitments to buy to-be-announced ("TBA") mortgage securities for which the Company does not intend to take delivery of the security and will enter into an offsetting position before physical delivery to lessen the price volatility of the mortgage servicing rights asset. These derivatives are recorded at their fair value on the consolidated balance sheets in other assets with changes in fair value recorded on the consolidated statements of operations in mortgage banking revenue in non-interest income. The Company’s derivative financial instruments are summarized below as of September 30, 2016 and December 31, 2015 (in thousands): Asset Derivatives Liability Derivatives September 30, 2016 December 31, 2015 September 30, 2016 December 31, 2015 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) $ — $ — $ — $ — $ 119 $ (5 ) $ 154 $ (9 ) Stand-alone derivative instruments: (2) Interest rate swap contracts 1,226,157 49,520 1,034,298 27,856 1,226,157 (49,520 ) 1,025,186 (27,899 ) Interest rate options contracts 219,409 872 222,585 628 219,409 (872 ) 190,622 (585 ) Foreign exchange contracts 49,550 3,231 72,529 3,970 44,474 (3,011 ) 63,339 (3,671 ) Spot foreign exchange contracts 742 17 328 5 278 (6 ) 132 — Mortgage related derivatives: Interest rate swap contracts 1,332,000 44,660 898,000 4,928 185,000 (10,915 ) 665,000 (3,723 ) Interest rate swaptions contracts — — — — — — — — Treasury futures contracts 86,500 406 — — — — — — TBA mortgage securities 290,000 856 35,000 33 — — — — Forward loan sale commitments 85,000 85 503,500 1,604 1,261,500 (6,001 ) 475,500 (1,087 ) Interest rate lock commitments 944,918 12,561 622,906 3,822 — — — — Total stand-alone derivative instruments 4,234,276 112,208 3,389,146 42,846 2,936,818 (70,325 ) 2,419,779 (36,965 ) Total $ 4,234,276 $ 112,208 $ 3,389,146 $ 42,846 $ 2,936,937 $ (70,330 ) $ 2,419,933 $ (36,974 ) (1) Derivative instruments designated to hedge fixed-rate commercial real estate loans. (2) These portfolio swaps are not designated as hedging instruments under ASC Topic 815. Amounts included in other operating income in the consolidated statements of operations related to derivative financial instruments were as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Derivative instruments designated as hedges of fair value: Interest rate swap contracts $ 3 $ 4 $ 3 $ 4 Stand-alone derivative instruments: Interest rate swap contracts 5,296 8,614 5,260 8,623 Interest rate options contracts (36 ) — — — Foreign exchange contracts 1,362 30 1,362 91 Spot foreign exchange contracts 6 14 6 182 Mortgage related derivatives (8,118 ) (9,411 ) 31,653 (9,408 ) Total stand-alone derivative instruments (1,490 ) (753 ) 38,281 (512 ) Total $ (1,487 ) $ (749 ) $ 38,284 $ (508 ) 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 September 30, 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 $ 652 $ — $ 652 $ 50,047 $ — $ 50,047 Foreign exchange contracts 2,850 — 2,850 1,551 — 1,551 Mortgage related derivatives 46,008 — 46,008 16,917 — 16,917 Total derivatives 49,510 — 49,510 68,515 — 68,515 Repurchase agreements — — — 256,569 — 256,569 Total $ 49,510 $ — $ 49,510 $ 325,084 $ — $ 325,084 Financial Assets Financial Liabilities Net Amount Recognized Financial Instruments Collateral Net Amount Net Amount Recognized Financial Instruments Collateral Net Amount Derivatives: Counterparty A $ 35,142 $ (15,868 ) $ — $ 19,274 $ 15,868 $ (15,868 ) $ — $ — Counterparty B 309 (309 ) — — 11,098 (309 ) (10,789 ) — Counterparty C 7,740 (7,740 ) — — 17,344 (7,740 ) (9,604 ) — Other counterparties 6,319 (6,296 ) — 23 24,205 (6,296 ) (17,886 ) 23 Total derivatives 49,510 (30,213 ) — 19,297 68,515 (30,213 ) (38,279 ) 23 Repurchase agreements — — — — 256,569 — (256,569 ) — Total $ 49,510 $ (30,213 ) $ — $ 19,297 $ 325,084 $ (30,213 ) $ (294,848 ) $ 23 Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of December 31, 2015 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 $ 5,698 $ — $ 5,698 $ 31,446 $ — $ 31,446 Foreign exchange contracts 2,728 — 2,728 1,805 — 1,805 Mortgage related derivatives 1,636 — 1,636 1,087 — 1,087 Total derivatives 10,062 — 10,062 34,338 — 34,338 Repurchase agreements — — — 201,207 — 201,207 Total $ 10,062 $ — $ 10,062 $ 235,545 $ — $ 235,545 Financial Assets Financial Liabilities Net Amount Recognized Financial Instruments Collateral Net Amount Net Amount Recognized Financial Instruments Collateral Net Amount Derivatives: Counterparty A $ 3,810 $ (3,810 ) $ — $ — $ 11,137 $ (3,810 ) $ (7,327 ) $ — Counterparty B 6 (6 ) — — 7,808 (6 ) (7,802 ) — Counterparty C 3,477 (3,477 ) — — 4,963 (3,477 ) (1,486 ) — Other counterparties 2,769 (2,230 ) — 539 10,430 (2,230 ) (8,034 ) 166 Total derivatives 10,062 (9,523 ) — 539 34,338 (9,523 ) (24,649 ) 166 Repurchase agreements — — — — 201,207 — (201,207 ) — Total $ 10,062 $ (9,523 ) $ — $ 539 $ 235,545 $ (9,523 ) $ (225,856 ) $ 166

Operating Segments

Operating Segments	9 Months Ended
	Sep. 30, 2016
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 offered through the Company's leasing subsidiaries, LaSalle Systems Leasing, Inc., Celtic Leasing Corp. and MB Equipment Finance, LLC. The leasing subsidiaries invest 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 subsidiaries also specialize 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 also 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 September 30, 2016 Net interest income $ 119,685 $ 2,168 $ 8,918 $ 130,771 Provision for credit losses 4,394 1,964 191 6,549 Non-interest income 40,533 18,759 49,095 108,387 Non-interest expense (1) 117,211 12,604 40,570 170,385 Income tax expense 8,420 2,484 6,901 17,805 Net income $ 30,193 $ 3,875 $ 10,351 $ 44,419 Total assets $ 16,453,379 $ 1,126,847 $ 1,761,656 $ 19,341,882 Three months ended September 30, 2015 Net interest income $ 104,714 $ 2,832 $ 8,423 $ 115,969 Provision for credit losses 4,965 242 151 5,358 Non-interest income 31,572 19,987 30,692 82,251 Non-interest expense (1) 88,276 11,382 34,608 134,266 Income tax expense 12,178 4,398 1,742 18,318 Net income $ 30,867 $ 6,797 $ 2,614 $ 40,278 Total assets $ 12,759,341 $ 956,433 $ 1,234,327 $ 14,950,101 (1) Includes merger related and repositioning expenses of $11.4 million and $389 thousand in the Banking Segment for the three months ended September 30, 2016 and 2015 , respectively. Banking Leasing Mortgage Banking Consolidated Nine months ended September 30, 2016 Net interest income $ 341,445 $ 7,002 $ 24,230 $ 372,677 Provision for credit losses 14,390 2,045 506 16,941 Non-interest income 112,221 53,670 116,189 282,080 Non-interest expense (1) 307,733 35,916 110,442 454,091 Income tax expense 36,120 8,872 11,788 56,780 Net income $ 95,423 $ 13,839 $ 17,683 $ 126,945 Total assets $ 16,453,379 $ 1,126,847 $ 1,761,656 $ 19,341,882 Nine months ended September 30, 2015 Net interest income $ 313,192 $ 8,762 $ 21,883 $ 343,837 Provision for credit losses 12,783 1,598 247 14,628 Non-interest income 94,197 61,383 90,888 246,468 Non-interest expense (1) 271,248 34,866 100,809 406,923 Income tax expense 35,509 13,218 4,686 53,413 Net income $ 87,849 $ 20,463 $ 7,029 $ 115,341 Total assets $ 12,759,341 $ 956,433 $ 1,234,327 $ 14,950,101 (1) Includes merger related and repositioning expenses of $17.2 million and $9.6 million in the Banking Segment for the nine months ended September 30, 2016 and 2015 , respectively.

Preferred Stock

Preferred Stock	9 Months Ended
	Sep. 30, 2016
Equity [Abstract]
Preferred Stock	Preferred Stock On August 18, 2014, in connection with the Taylor Capital merger, the Company issued one share of its Perpetual Non-Cumulative Preferred Stock, Series A (“Company Series A Preferred Stock”), in exchange for each of the 4,000,000 outstanding shares of Taylor Capital’s Perpetual Non-Cumulative Preferred Stock, Series A. Holders of the Company Series A Preferred Stock are entitled to receive, when as and if declared by the Company’s board of directors, non-cumulative cash dividends on the liquidation preference amount, which is $25 per share, at a rate of 8.00% per annum, payable quarterly. The Company Series A Preferred Stock is callable in February 2018. The Company Series A Preferred Stock is included in Tier 1 capital for regulatory capital purposes. On August 24, 2016, in connection with the American Chartered merger, the Company issued one share of its Cumulative Voting Convertible Preferred Stock, Series B ("Company Series B Preferred Stock"), in exchange for each of the 525 shares of American Chartered's Series D Preferred Stock outstanding immediately prior to the merger whose holders did not elect to receive the same consideration in the Merger as holders of American Chartered Common Stock, based on the number of shares of American Chartered Common Stock into which each such share of American Chartered Series D Preferred Stock would otherwise then be convertible. Holders of the Company Series B Preferred Stock are entitled to receive cumulative cash dividends on the liquidation preference amount, which is $1,000 per share, at a rate of 8.00% per annum, have the right to vote on all matters upon which holders of the Company's common stock are entitled to vote and have the right to convert each share into shares of the Company's common stock at any time. The Company Series B Preferred stock has a mandatory conversion date of September 20, 2017. The Company Series B Preferred Stock is included in Tier 2 capital for regulatory capital purposes.

New Authoritative Accounting 26

New Authoritative Accounting Guidance (Policies)	9 Months Ended
	Sep. 30, 2016
Accounting Changes and Error Corrections [Abstract]
New Authoritative Accounting Guidance	ASC Topic 810 "Consolidation." New authoritative accounting guidance under ASC Topic 810, "Consolidation" amended prior guidance over the consolidation of certain legal entities. The new authoritative guidance modifies the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, eliminates the presumption that a general partner should consolidate a limited partnership, affects the consolidation analysis of reporting entities that are involved with variable interest entities and provides a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements similar to those for registered money market funds. The Company adopted this new authoritative guidance on January 1, 2016, and it did not have an impact on the Company's statements of operations or financial condition. ASC Topic 835 "Interest." New authoritative accounting guidance under ASC Topic 835, "Interest" amended prior guidance to simplify the presentation of debt issuance costs. The new authoritative guidance requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The Company adopted this new authoritative guidance on January 1, 2016, and it did not have an impact on the Company's statements of operations or financial condition. ASC Topic 805 "Business Combinations." New authoritative accounting guidance under ASC Topic 805, "Business Combinations" amended prior guidance to require that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The new guidance requires that the acquirer record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. It also requires an entity to present separately on the face of the statement of operations or disclose in the notes the portion of the amount recorded in current-period earnings by line items that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. The Company adopted this new authoritative guidance on January 1, 2016, and it did not have an 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 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 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. 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 new authoritative guidance will be effective for reporting periods after January 1, 2017 and early adoption is permitted. 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 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 new authoritative guidance will be effective for reporting periods after January 1, 2017 and early adoption is permitted. This new authoritative guidance is not expected to 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 new authoritative guidance will be effective for reporting periods after January 1, 2017 and early adoption is permitted. This new authoritative guidance is not expected to have a significant impact on the Company's statements of operations or financial condition. ASC Topic 718 "Compensation - Stock Compensation." New authoritative accounting guidance under ASC Topic 718 "Compensation - Stock Compensation" amended prior guidance on several aspects, including the income tax consequences, classification of awards as either equity or liability, and classification on the statement of cash flows. The new authoritative guidance allows for all excess tax benefits and tax deficiencies to be recognized as income tax benefit or expense in the income statement. The tax effects of exercised or vested awards should be treated as discrete items in the reporting period in which they occur. An entity also should recognize excess tax benefits regardless of whether the benefit reduces taxes payable in the current period. For the statement of cash flows, excess tax benefits should be classified along with other income tax cash flows as an operating activity, and cash paid by an employer when directly withholding shares for tax withholding purposes should be classified as a financing activity. The new authoritative guidance also allows an entity to make an entity-wide accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures when they occur. In addition, the threshold to qualify for equity classification permits withholding up to the maximum statutory tax rates in the applicable jurisdictions. The new authoritative guidance will be effective for reporting periods after January 1, 2017 and early adoption is permitted. The Company early adopted the new guidance in the third quarter of 2016, and as a result, recorded a $1.8 million tax benefit in the Company's statements of operations. 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 its impact on the Company's statements of operations or financial condition. 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. 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.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Reconciliation of the Number of Shares Used in the Calculation of Basic and Diluted Earnings Per Common Share	The following table presents a reconciliation of the number of shares used in the calculation of basic and diluted earnings per common share (amounts in thousands, except share and per share data). Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Distributed earnings allocated to common stock $ 16,114 $ 12,733 $ 42,984 $ 36,227 Undistributed earnings 28,305 27,545 83,961 79,114 Net income 44,419 40,278 126,945 115,341 Less: preferred stock dividends 2,004 2,000 6,004 6,000 Net income available to common stockholders for basic earnings per common share 42,415 38,278 120,941 109,341 Plus: preferred stock dividends on convertible preferred stock 4 — 4 — Less: earnings allocated to participating securities 2 2 6 5 Earnings allocated to common stockholders for diluted earnings per common share $ 42,417 $ 38,276 $ 120,939 $ 109,336 Weighted average shares outstanding for basic earnings per common share 77,506,885 74,297,281 74,780,943 74,478,164 Dilutive effect of equity awards 1,176,285 732,546 946,637 676,421 Weighted average shares outstanding for diluted earnings per common share 78,683,170 75,029,827 75,727,580 75,154,585 Basic earnings per common share $ 0.55 $ 0.52 $ 1.62 $ 1.47 Diluted earnings per common share 0.54 0.51 1.60 1.45

Business Combinations (Tables)

Business Combinations (Tables)	9 Months Ended
	Sep. 30, 2016
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 1,952,826 Premises and equipment 39,061 Cash surrender value of life insurance 59,917 Goodwill 268,758 Other intangibles 25,500 Other real estate owned 4,148 Other assets 27,615 Total assets $ 2,992,696 LIABILITIES Deposits $ 2,389,423 Short-term borrowings 48,305 Long-term borrowings 16,000 Junior subordinated notes issued to capital trusts 28,075 Accrued expenses and other liabilities 23,477 Total liabilities $ 2,505,280 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
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 $ 24,575 $ 1,928,251 Gross contractual amounts receivable 31,408 2,207,765 Best estimate of contractual cash flows not expected to be collected (1) 5,048 129,027 Best estimate of contractual cash flows expected to be collected 26,360 2,078,738 (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 default.
Summary of Pro Forma Information	The following table provides the unaudited pro forma information for the results of operations for the nine months ended September 30, 2016 and 2015, as if the acquisition had occurred January 1, 2015. 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, 2015. 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 Nine Months Ended September 30, September 30, 2016 2015 2016 2015 (in thousands) Total revenues (net interest income plus non-interest income) $ 256,866 $ 228,099 $ 731,987 $ 678,735 Net income 48,432 50,581 147,078 141,751

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2016
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 September 30, 2016 Available for Sale U.S. Government sponsored agencies and enterprises $ 53,456 $ 512 $ — $ 53,968 States and political subdivisions 383,041 27,914 (218 ) 410,737 Residential mortgage-backed securities 1,066,834 10,948 (1,445 ) 1,076,337 Commercial mortgage-backed securities 93,962 3,203 (172 ) 96,993 Corporate bonds 208,940 2,167 (914 ) 210,193 Equity securities 10,932 196 — 11,128 Total Available for Sale 1,817,165 44,940 (2,749 ) 1,859,356 Held to Maturity States and political subdivisions 939,491 53,682 (33 ) 993,140 Residential mortgage-backed securities 175,771 6,927 — 182,698 Total Held to Maturity 1,115,262 60,609 (33 ) 1,175,838 Total $ 2,932,427 $ 105,549 $ (2,782 ) $ 3,035,194 December 31, 2015 Available for Sale U.S. Government sponsored agencies and enterprises $ 63,805 $ 806 $ — $ 64,611 States and political subdivisions 373,285 23,083 (1 ) 396,367 Residential mortgage-backed securities 759,816 7,363 (3,630 ) 763,549 Commercial mortgage-backed securities 128,509 1,839 (241 ) 130,107 Corporate bonds 222,784 815 (3,971 ) 219,628 Equity securities 10,757 4 — 10,761 Total Available for Sale 1,558,956 33,910 (7,843 ) 1,585,023 Held to Maturity States and political subdivisions 1,016,519 36,874 (638 ) 1,052,755 Residential mortgage-backed securities 214,291 7,721 — 222,012 Total Held to Maturity 1,230,810 44,595 (638 ) 1,274,767 Total $ 2,789,766 $ 78,505 $ (8,481 ) $ 2,859,790
Unrealized Losses on Investment Securities and the Fair Value of the Related Securities	Unrealized losses on investment securities by length of time in a continuous unrealized loss position and the fair value of the related securities at September 30, 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 $ 20,526 $ (218 ) $ — $ — $ 20,526 $ (218 ) Residential mortgage-backed securities 374,312 (1,214 ) 27,699 (231 ) 402,011 (1,445 ) Commercial mortgage-backed securities 71 (1 ) 11,664 (171 ) 11,735 (172 ) Corporate bonds 9,834 (155 ) 19,950 (759 ) 29,784 (914 ) Total Available for Sale 404,743 (1,588 ) 59,313 (1,161 ) 464,056 (2,749 ) Held to Maturity States and political subdivisions 31,142 (32 ) 387 (1 ) 31,529 (33 ) Total $ 435,885 $ (1,620 ) $ 59,700 $ (1,162 ) $ 495,585 $ (2,782 ) 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, 2015 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 $ 219 $ (1 ) $ — $ — $ 219 $ (1 ) Residential mortgage-backed securities 357,877 (2,835 ) 43,566 (795 ) 401,443 (3,630 ) Commercial mortgage-backed securities 2,324 (5 ) 11,809 (236 ) 14,133 (241 ) Corporate bonds 73,774 (1,164 ) 18,286 (2,807 ) 92,060 (3,971 ) Total Available for Sale 434,194 (4,005 ) 73,661 (3,838 ) 507,855 (7,843 ) Held to Maturity States and political subdivisions 66,152 (519 ) 6,190 (119 ) 72,342 (638 ) Total $ 500,346 $ (4,524 ) $ 79,851 $ (3,957 ) $ 580,197 $ (8,481 )
Summary of Net Gains (Losses) on Investment Securities Available for Sale	Net gains (losses) recognized on investment securities available for sale were as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Realized gains $ — $ 371 $ 323 $ 1,454 Realized losses — — (54 ) (1,627 ) Net gains (losses) $ — $ 371 $ 269 $ (173 )
Schedule of Remaining Contractual Maturities of Securities Included in the Securities Portfolio	The amortized cost and fair value of investment securities as of September 30, 2016 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 $ 81,215 $ 81,620 Due after one year through five years 267,485 273,115 Due after five years through ten years 44,899 46,964 Due after ten years 251,838 273,199 Equity securities 10,932 11,128 Residential and commercial mortgage-backed securities 1,160,796 1,173,330 1,817,165 1,859,356 Held to maturity: Due in one year or less 87,409 87,524 Due after one year through five years 146,995 151,557 Due after five years through ten years 159,780 171,871 Due after ten years 545,307 582,188 Residential mortgage-backed securities 175,771 182,698 1,115,262 1,175,838 Total $ 2,932,427 $ 3,035,194

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2016
Receivables [Abstract]
Schedule of Composition of Loans	Loans consist of the following at (in thousands): September 30, December 31, Commercial loans $ 4,385,812 $ 3,616,286 Commercial loans collateralized by assignment of lease payments 1,873,380 1,779,072 Commercial real estate 3,794,801 2,695,676 Residential real estate 998,827 628,169 Construction real estate 451,023 252,060 Indirect vehicle 522,271 384,095 Home equity 275,288 216,573 Other consumer loans 77,956 80,661 Total loans, excluding purchased credit-impaired loans 12,379,358 9,652,592 Purchased credit-impaired loans 161,338 141,406 Total loans $ 12,540,696 $ 9,793,998
Contractual Aging of the Recorded Investment in Past Due Loans by Class of Loans	The following table presents the contractual aging of the recorded investment in past due loans by class of loans as of September 30, 2016 and December 31, 2015 (in thousands): Current 30-59 Days 60-89 Days Loans Past Due Total Total September 30, 2016 Commercial $ 4,376,819 $ 2,649 $ 104 $ 6,240 $ 8,993 $ 4,385,812 Commercial collateralized by assignment of lease payments 1,855,322 12,141 4,672 1,245 18,058 1,873,380 Commercial real estate: Healthcare 572,228 — — — — 572,228 Industrial 854,045 298 1,289 — 1,587 855,632 Multifamily 549,486 141 366 113 620 550,106 Retail 522,696 333 235 453 1,021 523,717 Office 416,965 1,336 49 — 1,385 418,350 Other 871,881 1,646 532 709 2,887 874,768 Residential real estate 986,386 2,347 1,739 8,355 12,441 998,827 Construction real estate 451,023 — — — — 451,023 Indirect vehicle 518,881 2,301 716 373 3,390 522,271 Home equity 270,028 1,475 490 3,295 5,260 275,288 Other consumer 77,570 166 129 91 386 77,956 Total loans, excluding purchased credit-impaired loans 12,323,330 24,833 10,321 20,874 56,028 12,379,358 Purchased credit-impaired loans 92,346 1,108 5,848 62,036 68,992 161,338 Total loans $ 12,415,676 $ 25,941 $ 16,169 $ 82,910 $ 125,020 $ 12,540,696 Non-performing loan aging $ 31,009 $ 373 $ 1,801 $ 20,726 $ 22,900 $ 53,909 December 31, 2015 Commercial $ 3,586,372 $ 22,956 $ 97 $ 6,861 $ 29,914 $ 3,616,286 Commercial collateralized by assignment of lease payments 1,758,839 3,399 5,902 10,932 20,233 1,779,072 Commercial real estate: Healthcare 476,939 — — — — 476,939 Industrial 400,182 — — 757 757 400,939 Multifamily 399,333 622 88 934 1,644 400,977 Retail 410,958 6,189 7,411 180 13,780 424,738 Office 223,935 58 — 5,189 5,247 229,182 Other 760,530 622 82 1,667 2,371 762,901 Residential real estate 612,573 5,193 1,729 8,674 15,596 628,169 Construction real estate 252,060 — — — — 252,060 Indirect vehicle 380,899 2,085 698 413 3,196 384,095 Home equity 207,818 1,774 1,398 5,583 8,755 216,573 Other consumer 80,225 254 84 98 436 80,661 Total loans, excluding purchased credit-impaired loans 9,550,663 43,152 17,489 41,288 101,929 9,652,592 Purchased credit-impaired loans 81,250 3,311 4,439 52,406 60,156 141,406 Total loans $ 9,631,913 $ 46,463 $ 21,928 $ 93,694 $ 162,085 $ 9,793,998 Non-performing loan aging $ 44,290 $ 9,827 $ 9,367 $ 41,177 $ 60,371 $ 104,661
Recorded Investment in Non-accrual Loans and Loans Past Due Ninety Days or More and Still Accruing by Class of Loans	The following table presents the recorded investment in non-accrual loans and loans past due ninety days or more and still accruing by class of loans, excluding purchased credit-impaired loans, as of September 30, 2016 and December 31, 2015 (in thousands): September 30, 2016 December 31, 2015 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 $ 8,583 $ 1,166 $ 24,689 $ 42 Commercial collateralized by assignment of lease payments 4,996 153 7,027 5,318 Commercial real estate: Healthcare — — — — Industrial 278 — 1,136 — Multifamily 2,648 — 3,415 — Office 447 — 4,496 693 Retail 607 — 17,594 — Other 531 144 1,544 195 Residential real estate 16,781 220 17,951 253 Construction real estate — — — — Indirect vehicle 1,955 — 2,046 — Home equity 15,300 — 18,156 — Other consumer 9 91 11 95 Total $ 52,135 $ 1,774 $ 98,065 $ 6,596
Risk Category of Loans by Class of Loans	The following tables present the risk category of loans by class of loans based on the most recent analysis performed, excluding purchased credit-impaired loans, as of September 30, 2016 and December 31, 2015 (in thousands): Pass Special Substandard Doubtful Total September 30, 2016 Commercial $ 4,163,243 $ 131,163 $ 91,406 $ — $ 4,385,812 Commercial collateralized by assignment of lease payments 1,859,012 5,504 8,864 — 1,873,380 Commercial real estate: Healthcare 555,166 17,062 — — 572,228 Industrial 831,090 23,751 791 — 855,632 Multifamily 546,183 312 3,611 — 550,106 Retail 514,299 8,646 772 — 523,717 Office 409,124 5,086 4,140 — 418,350 Other 828,578 26,085 20,105 — 874,768 Construction real estate 451,023 — — — 451,023 Total $ 10,157,718 $ 217,609 $ 129,689 $ — $ 10,505,016 December 31, 2015 Commercial $ 3,373,943 $ 115,548 $ 126,795 $ — $ 3,616,286 Commercial collateralized by assignment of lease payments 1,760,674 4,367 14,031 — 1,779,072 Commercial real estate: Healthcare 472,599 4,340 — — 476,939 Industrial 380,200 19,011 1,728 — 400,939 Multifamily 396,117 595 4,265 — 400,977 Retail 393,543 13,310 17,885 — 424,738 Office 216,584 3,797 8,801 — 229,182 Other 730,713 6,193 25,995 — 762,901 Construction real estate 252,060 — — — 252,060 Total $ 7,976,433 $ 167,161 $ 199,500 $ — $ 8,343,094
Recorded Investment in Loan Classes Based on Payment Activity	The following table presents the recorded investment in those loan classes based on payment activity, excluding purchased credit-impaired loans, as of September 30, 2016 and December 31, 2015 (in thousands): Performing Non-performing Total September 30, 2016 Residential real estate $ 981,826 $ 17,001 $ 998,827 Indirect vehicle 520,316 1,955 522,271 Home equity 259,988 15,300 275,288 Other consumer 77,856 100 77,956 Total $ 1,839,986 $ 34,356 $ 1,874,342 December 31, 2015 Residential real estate $ 609,965 $ 18,204 $ 628,169 Indirect vehicle 382,049 2,046 384,095 Home equity 198,417 18,156 216,573 Other consumer 80,555 106 80,661 Total $ 1,270,986 $ 38,512 $ 1,309,498
Loans Individually Evaluated for Impairment by Class of Loans	The following tables present loans individually evaluated for impairment by class of loans, excluding purchased credit-impaired loans, as of September 30, 2016 and December 31, 2015 (in thousands): September 30, 2016 Three Months Ended Nine Months Ended Unpaid Recorded Partial Allowance for Average Interest Average Interest With no related allowance recorded: Commercial $ 1,808 $ 1,808 $ — $ — $ 1,871 $ — $ 2,377 $ — Commercial collateralized by assignment of lease payments 1,161 794 367 — 1,141 27 1,026 27 Commercial real estate: Healthcare — — — — — — — — Industrial — — — — — — 536 — Multifamily 1,981 1,981 — — 2,334 — 2,362 — Retail 2,683 943 1,740 — 949 — 2,577 — Office — — — — — — 342 — Other — — — — — — 80 — Residential real estate — — — — — — — — Construction real estate — — — — — — — — Indirect vehicle 218 125 93 — 277 — 292 — Home equity — — — — — — 192 — Other consumer — — — — — — — — With an allowance recorded: Commercial 17,476 17,476 — 5,401 19,180 — 26,513 — Commercial collateralized by assignment of lease payments 7,260 7,260 — 3,933 5,086 — 3,201 18 Commercial real estate: Healthcare — — — — — — — — Industrial — — — — — — — — Multifamily — — — — — — — — Retail 3,606 3,606 — 363 3,612 — 7,911 — Office — — — — — — 995 — Other — — — — — — 314 — Residential real estate 15,117 13,268 1,849 2,394 13,325 — 13,068 — Construction real estate — — — — — — — — Indirect vehicle — — — — — — — — Home equity 29,688 27,276 2,412 3,252 27,443 — 28,635 — Other consumer — — — — — — — — Total $ 80,998 $ 74,537 $ 6,461 $ 15,343 $ 75,218 $ 27 $ 90,421 $ 45 December 31, 2015 Year Ended Unpaid Recorded Partial Allowance for Average Interest With no related allowance recorded: Commercial $ 11,253 $ 11,253 $ — $ — $ 6,628 $ — Commercial collateralized by assignment of lease payments 3,453 2,949 504 — 1,035 54 Commercial real estate: Healthcare — — — — — — Industrial 820 757 63 — 3,467 — Multifamily 575 575 — — 1,540 17 Retail 7,872 6,131 1,741 — 2,768 — Office 1,608 1,031 577 — 1,663 — Other — — — — 965 — Residential real estate 970 970 — — 717 — Construction real estate — — — — — — Indirect vehicle — — — — — — Home equity 927 927 — — 1,000 — Other consumer — — — — — — With an allowance recorded: Commercial 23,394 23,394 — 7,523 18,820 — Commercial collateralized by assignment of lease payments 3,297 3,297 — 1,790 4,013 104 Commercial real estate: Healthcare — — — — — — Industrial — — — — 228 — Multifamily 2,155 2,155 — 17 3,307 27 Retail 16,034 16,034 — 4,926 8,885 — Office 2,929 2,929 — 1,717 2,457 — Other 592 592 — 199 9,629 — Residential real estate 12,950 12,769 181 2,634 13,484 — Construction real estate — — — — 214 — Indirect vehicle 119 119 — — 287 — Home equity 28,696 28,583 113 3,131 27,747 — Other consumer — — — — — — Total $ 117,644 $ 114,465 $ 3,179 $ 21,937 $ 108,854 $ 202
Schedule of Loans That Have Been Restructured	The following table presents loans that were restructured during the three months ended September 30, 2016 (dollars in thousands): September 30, 2016 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Residential real estate 2 $ 101 $ 101 $ 18 Home equity 2 102 102 12 Total 4 $ 203 $ 203 $ 30 Non-Performing: Commercial 3 $ 5,874 $ 5,874 $ 1,490 Residential real estate 4 484 484 85 Indirect vehicle 7 34 34 17 Home equity 5 489 489 72 Total 19 $ 6,881 $ 6,881 $ 1,664 The following table presents loans that were restructured during the nine months ended September 30, 2016 (dollars in thousands): September 30, 2016 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Commercial 1 $ 1,870 $ 1,870 $ 412 Residential real estate 2 101 101 18 Home equity 4 511 511 12 Total 7 $ 2,482 $ 2,482 $ 442 Non-Performing: Commercial 7 $ 14,481 $ 14,481 $ 4,990 Residential real estate 6 639 639 85 Indirect vehicle 25 183 183 60 Home equity 28 3,600 3,600 138 Total 66 $ 18,903 $ 18,903 $ 5,273 The following table presents loans that were restructured during the three months ended September 30, 2015 (dollars in thousands): September 30, 2015 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Home equity 4 $ 477 $ 477 $ — Total 4 $ 477 $ 477 $ — Non-Performing: Indirect vehicle 7 $ 45 $ 45 $ 16 Home equity 4 550 550 8 Total 11 $ 595 $ 595 $ 24 The following table presents loans that were restructured during the nine months ended September 30, 2015 (dollars in thousands): September 30, 2015 Number of Pre-Modification Recorded Post-Modification Recorded Charge-offs and Performing: Commercial 1 $ 80 $ 80 $ — Home equity 16 4,290 4,290 — Total 17 $ 4,370 $ 4,370 $ — Non-Performing: Commercial real estate: Multifamily 1 $ 334 $ 334 $ — Residential real estate 1 140 140 17 Indirect vehicle 13 75 75 23 Home equity 9 1,348 1,348 130 Total 24 $ 1,897 $ 1,897 $ 170
Troubled Debt Restructuring Activity Rollforward	The following table presents the troubled debt restructurings activity during the nine months ended September 30, 2016 (in thousands): Performing Non-performing Beginning balance $ 26,991 $ 23,619 Additions 2,482 18,903 Charge-offs — (1,046 ) Principal payments, net (2,145 ) (8,695 ) Removals (1,655 ) (6,384 ) Transfer to other real estate owned — (112 ) Transfers in 3,677 789 Transfers out (789 ) (3,677 ) Ending balance $ 28,561 $ 23,397
Type of Financing Receivable Modifications and Restructuring	The following table presents the type of modification for loans that have been restructured during the nine months ended September 30, 2016 (in thousands): September 30, 2016 Extended Maturity, Delay in Amortization Extended Payments or and Reduction Maturity and/or Reduction of of Interest Rate Amortization Interest Rate Total Commercial $ — $ 14,481 $ 1,870 $ 16,351 Commercial collateralized by assignment of lease payments — — — — Commercial real estate: Healthcare — — — — Industrial — — — — Multifamily — — — — Retail — — — — Office — — — — Other — — — — Residential real estate 484 256 — 740 Construction real estate — — — — Indirect vehicle — — 183 183 Home equity 3,220 820 71 4,111 Other consumer — — — — Total $ 3,704 $ 15,557 $ 2,124 $ 21,385
Allowance Activity for Credit Losses, Balance in Allowance for Credit Losses and Recorded Investment in Loans by Portfolio Segment	The following table presents the activity in the allowance for credit losses, balance in allowance for credit losses and recorded investment in loans by portfolio segment and based on impairment method as of September 30, 2016 and 2015 (in thousands): Commercial Commercial collateralized by assignment of lease payments Commercial real estate Residential real estate Construction real estate Indirect vehicle Home equity Other consumer Unfunded commitments Total September 30, 2016 Allowance for credit losses: Three Months Ended Beginning balance $ 50,297 $ 10,549 $ 46,040 $ 4,800 $ 14,230 $ 3,100 $ 4,199 $ 2,399 $ 2,719 $ 138,333 Charge-offs 1,341 367 529 290 7 838 376 409 — 4,157 Recoveries 665 3 324 45 50 436 65 86 — 1,674 Provision (3,894 ) 2,944 1,239 1,575 2,033 598 2,309 (407 ) 152 6,549 Ending balance $ 45,727 $ 13,129 $ 47,074 $ 6,130 $ 16,306 $ 3,296 $ 6,197 $ 1,669 $ 2,871 $ 142,399 Nine 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 2,126 3,288 2,601 1,134 151 2,420 1,233 1,216 — 14,169 Recoveries 1,997 520 2,761 151 94 1,400 576 620 — 8,119 Provision 6,540 5,463 1,439 1,379 1,250 1,898 (520 ) (11 ) (497 ) 16,941 Ending balance $ 45,727 $ 13,129 $ 47,074 $ 6,130 $ 16,306 $ 3,296 $ 6,197 $ 1,669 $ 2,871 $ 142,399 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 5,401 $ 3,933 $ 363 $ 2,394 $ — $ — $ 3,252 $ — $ 737 $ 16,080 Collectively evaluated for impairment 40,161 9,196 46,235 3,736 16,249 3,296 2,945 1,669 2,134 125,621 Acquired and accounted for under ASC 310-30 (1) 165 — 476 — 57 — — — — 698 Total ending allowance balance $ 45,727 $ 13,129 $ 47,074 $ 6,130 $ 16,306 $ 3,296 $ 6,197 $ 1,669 $ 2,871 $ 142,399 Loans: Individually evaluated for impairment $ 19,284 $ 8,054 $ 6,530 $ 13,268 $ — $ 125 $ 27,276 $ — $ — $ 74,537 Collectively evaluated for impairment 4,366,528 1,865,326 3,788,271 985,559 451,023 522,146 248,012 77,956 — 12,304,821 Acquired and accounted for under ASC 310-30 (1) 22,913 — 41,286 66,698 14,131 — 13,886 2,424 — 161,338 Total ending loans balance $ 4,408,725 $ 1,873,380 $ 3,836,087 $ 1,065,525 $ 465,154 $ 522,271 $ 289,174 $ 80,380 $ — $ 12,540,696 Commercial Commercial collateralized by assignment of lease payments Commercial real estate Residential real estate Construction real estate Indirect vehicle Home equity Other consumer Unfunded commitments Total September 30, 2015 Allowance for credit losses: Three Months Ended Beginning balance $ 39,142 $ 11,268 $ 38,076 $ 6,669 $ 12,459 $ 1,909 $ 8,412 $ 2,135 $ 4,060 $ 124,130 Charge-offs 1,657 1,980 170 292 5 581 358 467 — 5,510 Recoveries 456 11 2,402 337 216 334 186 118 — 4,060 Provision 5,044 985 1,216 (868 ) 123 512 (1,490 ) 484 (648 ) 5,358 Ending balance $ 42,985 $ 10,284 $ 41,524 $ 5,846 $ 12,793 $ 2,174 $ 6,750 $ 2,270 $ 3,412 $ 128,038 Nine Months Ended Beginning balance $ 29,571 $ 9,962 $ 41,826 $ 6,646 $ 8,918 $ 1,687 $ 9,456 $ 1,960 $ 4,031 $ 114,057 Charge-offs 2,283 2,080 2,312 1,189 11 2,082 1,078 1,391 — 12,426 Recoveries 1,514 1,100 6,338 417 253 1,354 447 356 — 11,779 Provision 14,183 1,302 (4,328 ) (28 ) 3,633 1,215 (2,075 ) 1,345 (619 ) 14,628 Ending balance $ 42,985 $ 10,284 $ 41,524 $ 5,846 $ 12,793 $ 2,174 $ 6,750 $ 2,270 $ 3,412 $ 128,038 Ending allowance balance attributable to loans: Individually evaluated for impairment $ 7,943 $ 2,618 $ 3,123 $ 2,834 $ — $ 8 $ 2,478 $ — $ 1,388 $ 20,392 Collectively evaluated for impairment 34,731 7,666 36,975 3,012 12,700 2,166 4,272 2,270 2,024 105,816 Acquired and accounted for under ASC 310-30 (1) 311 — 1,426 — 93 — — — — 1,830 Total ending allowance balance $ 42,985 $ 10,284 $ 41,524 $ 5,846 $ 12,793 $ 2,174 $ 6,750 $ 2,270 $ 3,412 $ 128,038 Loans: Individually evaluated for impairment $ 36,325 $ 6,724 $ 29,354 $ 14,233 $ — $ 131 $ 29,520 $ — $ — $ 116,287 Collectively evaluated for impairment 3,404,307 1,686,816 2,550,655 592,938 255,620 345,600 193,653 87,612 — 9,117,201 Acquired and accounted for under ASC 310-30 (1) 37,189 — 47,803 43,735 12,372 — 11,986 2,608 — 155,693 Total ending loans balance $ 3,477,821 $ 1,693,540 $ 2,627,812 $ 650,906 $ 267,992 $ 345,731 $ 235,159 $ 90,220 $ — $ 9,389,181 (1) Loans acquired in business combinations and accounted for under ASC Subtopic 310-30 “Receivables — Loans and Debt Securities Acquired with Deteriorated Credit Quality.”
Changes in the Accretable Yield for Purchased Credit-Impaired Loans	Changes in the accretable yield for loans acquired and accounted for under ASC 310-30 were as follows for the three and nine months ended September 30, 2016 and 2015 (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Balance at beginning of period $ 13,160 $ 11,456 $ 12,596 $ 7,434 Purchases 805 — 805 — Accretion (2,564 ) (1,794 ) (7,193 ) (5,541 ) Other (1) 2,523 590 7,716 8,359 Balance at end of period $ 13,924 $ 10,252 $ 13,924 $ 10,252 (1) Primarily includes discount transfers from non-accretable discount to accretable discount due to better than expected performance of loan pools acquired and accounted for under ASC 310-30.
Carrying Amount of Loans Acquired Through a Business Combination by Loan Pool Type	The carrying amount of loans acquired through a business combination by loan pool type are as follows (in thousands): September 30, 2016 Purchased Purchased Non-Credit-Impaired Total Covered loans: Consumer related $ 18,619 $ — $ 18,619 Non-covered loans: Commercial loans 22,913 972,065 994,978 Commercial loans collateralized by assignment of lease payments — 72,193 72,193 Commercial real estate 41,286 1,412,677 1,453,963 Construction real estate 14,131 38,568 52,699 Consumer related 64,389 403,608 467,997 Total non-covered loans 142,719 2,899,111 3,041,830 Total acquired $ 161,338 $ 2,899,111 $ 3,060,449

Goodwill and Intangibles (Table

Goodwill and Intangibles (Tables)	9 Months Ended
	Sep. 30, 2016
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 nine months ended September 30, 2016 (in thousands): Banking Leasing Mortgage Banking Total Balance at beginning of period $ 684,430 $ 40,640 $ — $ 725,070 Goodwill from business combinations (1) 268,729 — — 268,729 Balance at end of period $ 953,159 $ 40,640 $ — $ 993,799 (1) Due to the American Chartered merger and adjustments recognized for the MSA acquisition.
Changes in the Carrying Amount of Core Deposit and Client Relationship Intangibles	The following table presents the changes during the nine months ended September 30, 2016 in the carrying amount of core deposit and client relationship intangibles, and the gross carrying amount, accumulated amortization, and net book value as of September 30, 2016 (in thousands): September 30, 2016 Balance at beginning of period $ 44,812 Amortization expense (4,917 ) Other intangibles from acquisition 25,500 Balance at end of period $ 65,395 Gross carrying amount $ 118,792 Accumulated amortization (53,397 ) Net book value $ 65,395
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 2016 $ 2,390 2017 8,198 2018 7,456 2019 5,677 2020 5,026 Thereafter 36,648 $ 65,395

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Sep. 30, 2016
Banking and Thrift [Abstract]
Schedule of Composition of Deposits	The composition of deposits was as follows as of September 30, 2016 and December 31, 2015 (in thousands): September 30, December 31, 2016 2015 Demand deposit accounts, non-interest bearing $ 6,410,334 $ 4,627,184 NOW, money market and interest bearing deposits 4,660,407 4,144,633 Savings accounts 1,147,900 974,555 Certificates of deposit, $250,000 or more 1,121,599 877,352 Other certificates of deposit 939,026 881,491 Total $ 14,279,266 $ 11,505,215

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Summary of Short-Term Borrowings	Short-term borrowings were as follows as of September 30, 2016 and December 31, 2015 (dollars in thousands): September 30, 2016 December 31, 2015 Weighted Average Interest Rate Amount Weighted Average Interest Rate Amount Customer repurchase agreements 0.21 % $ 256,569 0.20 % $ 201,207 Federal Home Loan Bank advances 0.38 1,200,000 0.17 775,000 Federal funds purchased 0.60 39,750 0.09 4,530 Line of credit — — 2.18 25,000 Total 0.36 % $ 1,496,319 0.23 % $ 1,005,737

Junior Subordinated Notes Iss34

Junior Subordinated Notes Issued to Capital Trusts (Tables)	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Outstanding Junior Subordinated Notes and the Related Trust Preferred Securities Issued by Each Trust	The table below summarizes the outstanding junior subordinated notes and the related trust preferred securities issued by each trust as of September 30, 2016 (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 $ 10,464 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 $6.8 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 $8.0 million .

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Schedule of Outstanding Financial Instruments, Contractual Amounts of Off-Balance Sheet Credit Risk	At September 30, 2016 and December 31, 2015 , the following financial instruments were outstanding, the contractual amounts of which represent off-balance sheet credit risk (in thousands): Contractual Amount September 30, 2016 December 31, 2015 Commitments to extend credit: Home equity lines $ 243,331 $ 187,478 Other commitments 3,596,246 3,049,152 Letters of credit: Standby 172,737 137,945 Commercial 5,211 1,108

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis	The following table summarizes financial assets and financial liabilities measured at fair value on a recurring basis as of September 30, 2016 and December 31, 2015 , segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands): Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) September 30, 2016 Financial assets Securities available for sale: U.S Government sponsored agencies and enterprises $ 53,968 $ — $ 53,968 $ — States and political subdivisions 410,737 — 410,320 417 Residential mortgage-backed securities 1,076,337 — 1,076,132 205 Commercial mortgage-backed securities 96,993 — 96,993 — Corporate bonds 210,193 — 210,193 — Equity securities 11,128 11,128 — — Loans held for sale 899,412 — 899,412 — Loans 19,121 — 19,121 — Mortgage servicing rights 154,730 — — 154,730 Assets held in trust for deferred compensation 18,937 18,937 — — Derivative financial instruments 112,208 1,347 98,300 12,561 Financial liabilities Other liabilities (1) 18,937 18,937 — — Derivative financial instruments 70,330 6,001 64,329 — December 31, 2015 Financial assets Securities available for sale: U.S. Government sponsored agencies and enterprises $ 64,611 $ — $ 64,611 $ — States and political subdivisions 396,367 — 395,950 417 Residential mortgage-backed securities 763,549 — 763,193 356 Commercial mortgage-backed securities 130,107 — 130,107 — Corporate bonds 219,628 — 219,628 — Equity securities 10,761 10,761 — — Loans held for sale 744,727 — 744,727 — Loans 25,869 — 25,869 — Mortgage servicing rights 168,162 — — 168,162 Assets held in trust for deferred compensation 16,820 16,820 — — Derivative financial instruments 42,846 5,118 33,906 3,822 Financial liabilities Other liabilities (1) 16,333 16,333 — — Derivative financial instruments 36,974 6,050 30,924 — (1) Liabilities associated with assets held in trust for deferred compensation
Summary of Financial Assets Measured at Fair Value on a Recurring Basis, Unobservable Inputs Used	The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a nonrecurring basis that were categorized within the Level 3 of the fair value hierarchy: Fair Value at Valuation Unobservable September 30, 2016 Technique Input Range (in thousands) Impaired loans $ 54,740 Appraisal of collateral Appraisal adjustments 5% - 10% Foreclosed assets 38,735 Appraisal of collateral Appraisal adjustments 5% - 10% The following table presents additional information about the unobservable inputs used in the fair value measurement of financial assets measured on a recurring basis that were categorized within the Level 3 of the fair value hierarchy: Fair Value at September 30, 2016 Valuation Technique Unobservable Input Range (in thousands) States and political subdivisions $ 417 Discounted cash flows Credit assumption 50% Loss Residential mortgage-backed securities 205 Discounted cash flows Constant pre-payment rates (CPR) 1% - 3% Mortgage servicing rights 154,730 Discounted cash flows CPR 12.3% - 16.1% Discount rate 9.50 - 12.00 Maturity (months) 327 - 357 Delinquencies 0.51 - 3.86 Costs to service $ 66 - $ 160 Costs to service - delinquent $ 150 - $ 1,000 Derivative financial instruments (mortgage 12,561 Sales cash flows Expected closing ratio 70% - 95% interest rate lock commitments) Expected delivery price 98.58 bps - 109.77 bps
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets	Key economic assumptions used in the measuring of the fair value of the mortgage servicing rights and the sensitivity of the fair value to immediate adverse changes in those assumptions at September 30, 2016 are presented in the following table. This table does not take into account the derivatives used to economically hedge the mortgage servicing rights. (dollars in thousands, except for weighted average cost to service) September 30, 2016 Weighted average CPR 15.30 % Impact on fair value of 10% adverse change $ (7,917 ) Impact on fair value of 20% adverse change (15,144 ) Weighted average discount rate 9.78 % Impact on fair value of 10% adverse change $ (5,045 ) Impact on fair value of 20% adverse change (9,769 ) Weighted average delinquency rate 1.80 % Impact on fair value of 10% adverse change $ (1,329 ) Impact on fair value of 20% adverse change (2,428 ) Weighted average costs to service $ 88 Impact on fair value of 10% adverse change (2,988 ) Impact on fair value of 20% adverse change (5,976 )
Financial Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3)	The following table presents additional information about financial assets measured at fair value on a recurring basis for which the Company used significant unobservable inputs (Level 3): Nine Months Ended September 30, 2016 2015 2016 2015 2016 2015 (in thousands) Investment Securities Mortgage Servicing Rights Derivatives Balance, beginning of period $ 773 $ 973 $ 168,162 $ 235,402 $ 3,822 $ 5,074 Purchases — — 3,423 785 — — Originations — — 43,039 55,583 — — Included in earnings — — (59,894 ) (40,568 ) 8,739 3,088 Principal payments (151 ) (115 ) — — — — Sales — — — (103,105 ) — — Balance, ending of period $ 622 $ 858 $ 154,730 $ 148,097 $ 12,561 $ 8,162
Assets Measured at Fair Value on a Nonrecurring Basis	Assets measured at fair value on a nonrecurring basis as of September 30, 2016 and December 31, 2015 are included in the table below (in thousands): Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) September 30, 2016 Financial assets: Impaired loans $ 54,740 $ — $ — $ 54,740 Non-financial assets: Foreclosed assets 38,735 — — 38,735 December 31, 2015 Financial assets: Impaired loans $ 76,203 $ — $ — $ 76,203 Non-financial assets: Foreclosed assets 42,351 — — 42,351
Estimated Fair Values of Financial Instruments	The estimated fair values of financial instruments are as follows (in thousands): September 30, 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 $ 351,009 $ 351,009 $ 351,009 $ — $ — Interest earning deposits with banks 125,250 125,250 125,250 — — Investment securities available for sale 1,859,356 1,859,356 11,128 1,847,606 622 Investment securities held to maturity 1,115,262 1,175,838 — 1,175,838 — Non-marketable securities - FHLB and FRB stock 146,209 146,209 — — 146,209 Loans held for sale 899,412 899,412 — 899,412 — Loans, net 12,401,168 12,403,330 — 19,121 12,384,209 Accrued interest receivable 58,541 58,541 58,541 — — Derivative financial instruments 112,208 112,208 1,347 98,300 12,561 Financial Liabilities: Non-interest bearing deposits $ 6,410,334 $ 6,410,334 $ 6,410,334 $ — $ — Interest bearing deposits 7,868,932 7,873,233 — — 7,873,233 Short-term borrowings 1,496,319 1,496,312 — — 1,496,312 Long-term borrowings 311,645 312,974 — — 312,974 Junior subordinated notes issued to capital trusts 209,159 144,681 — — 144,681 Accrued interest payable 4,000 4,000 4,000 — — Derivative financial instruments 70,330 70,330 6,001 64,329 — December 31, 2015 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 $ 307,869 $ 307,869 $ 307,869 $ — $ — Interest earning deposits with banks 73,572 73,572 73,572 — — Investment securities available for sale 1,585,023 1,585,023 10,761 1,573,489 773 Investment securities held to maturity 1,230,810 1,274,767 — 1,274,767 — Non-marketable securities - FHLB and FRB stock 114,233 114,233 — — 114,233 Loans held for sale 744,727 744,727 — 744,727 — Loans, net 9,665,858 9,626,344 — 25,869 9,600,475 Accrued interest receivable 53,457 53,457 53,457 — — Derivative financial instruments 42,846 42,846 5,118 33,906 3,822 Financial Liabilities: Non-interest bearing deposits $ 4,627,184 $ 4,627,184 $ 4,627,184 $ — $ — Interest bearing deposits 6,878,031 6,875,411 — — 6,875,411 Short-term borrowings 1,005,737 1,005,705 — — 1,005,705 Long-term borrowings 400,274 401,539 — — 401,539 Junior subordinated notes issued to capital trusts 186,164 122,696 — — 122,696 Accrued interest payable 3,186 3,186 3,186 — — Derivative financial instruments 36,974 36,974 6,050 30,924 —

Stock Incentive Plans (Tables)

Stock Incentive Plans (Tables)	9 Months Ended
	Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-Based Payment Plans	The following table summarizes the impact of the Company’s share-based payment plans in the financial statements for the periods shown (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Total cost of share-based payment plans during the period $ 4,238 $ 3,508 $ 12,573 $ 10,983 Amount of related income tax benefit recognized in income 3,394 1,367 6,649 $ 4,288
Summary of Changes in Stock Options	The following table summarizes changes in stock options for the nine months ended September 30, 2016 : 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, 2015 2,192,431 $ 27.77 4.44 Granted 501,538 28.86 Exercised (461,405 ) 28.98 Expired (35,791 ) 39.91 Forfeited or cancelled (33,680 ) 31.06 Options outstanding as of September 30, 2016 2,163,093 $ 27.51 5.26 $ 22,903 Options exercisable as of September 30, 2016 1,423,442 $ 26.82 3.53 $ 16,109
Assumptions Used for Options Granted	The following assumptions were used for options granted during the nine months ended September 30, 2016 : September 30, 2016 Risk-free interest rate 1.44 % Expected volatility of Company’s stock 28.17 % Expected dividend yield 2.21 % Expected life of options 5.6 years Weighted average fair value per option of options granted during the year $ 6.64
Summary of Changes in Restricted Shares and Units	The following is a summary of changes in restricted shares and units for the nine months ended September 30, 2016 : Number of Shares and Units Weighted Average Grant Date Fair Value Shares and units outstanding at December 31, 2015 945,506 $ 29.92 Granted 482,739 31.19 Vested (405,633 ) 28.37 Forfeited or cancelled (23,824 ) 29.95 Shares and units outstanding at September 30, 2016 998,788 31.17

Derivative Financial Instrume38

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Derivative Financial Instruments	The Company’s derivative financial instruments are summarized below as of September 30, 2016 and December 31, 2015 (in thousands): Asset Derivatives Liability Derivatives September 30, 2016 December 31, 2015 September 30, 2016 December 31, 2015 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) $ — $ — $ — $ — $ 119 $ (5 ) $ 154 $ (9 ) Stand-alone derivative instruments: (2) Interest rate swap contracts 1,226,157 49,520 1,034,298 27,856 1,226,157 (49,520 ) 1,025,186 (27,899 ) Interest rate options contracts 219,409 872 222,585 628 219,409 (872 ) 190,622 (585 ) Foreign exchange contracts 49,550 3,231 72,529 3,970 44,474 (3,011 ) 63,339 (3,671 ) Spot foreign exchange contracts 742 17 328 5 278 (6 ) 132 — Mortgage related derivatives: Interest rate swap contracts 1,332,000 44,660 898,000 4,928 185,000 (10,915 ) 665,000 (3,723 ) Interest rate swaptions contracts — — — — — — — — Treasury futures contracts 86,500 406 — — — — — — TBA mortgage securities 290,000 856 35,000 33 — — — — Forward loan sale commitments 85,000 85 503,500 1,604 1,261,500 (6,001 ) 475,500 (1,087 ) Interest rate lock commitments 944,918 12,561 622,906 3,822 — — — — Total stand-alone derivative instruments 4,234,276 112,208 3,389,146 42,846 2,936,818 (70,325 ) 2,419,779 (36,965 ) Total $ 4,234,276 $ 112,208 $ 3,389,146 $ 42,846 $ 2,936,937 $ (70,330 ) $ 2,419,933 $ (36,974 ) (1) Derivative instruments designated to hedge fixed-rate commercial real estate loans. (2) These portfolio swaps are not designated as hedging instruments under ASC Topic 815.
Schedule of the Amounts Included in Consolidated Statements of Operations Related to Derivative Financial Instruments	Amounts included in other operating income in the consolidated statements of operations related to derivative financial instruments were as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Derivative instruments designated as hedges of fair value: Interest rate swap contracts $ 3 $ 4 $ 3 $ 4 Stand-alone derivative instruments: Interest rate swap contracts 5,296 8,614 5,260 8,623 Interest rate options contracts (36 ) — — — Foreign exchange contracts 1,362 30 1,362 91 Spot foreign exchange contracts 6 14 6 182 Mortgage related derivatives (8,118 ) (9,411 ) 31,653 (9,408 ) Total stand-alone derivative instruments (1,490 ) (753 ) 38,281 (512 ) Total $ (1,487 ) $ (749 ) $ 38,284 $ (508 )
Schedule of Financial Instruments Eligible for Offset In the Consolidated Balance Sheet	Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of September 30, 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 $ 652 $ — $ 652 $ 50,047 $ — $ 50,047 Foreign exchange contracts 2,850 — 2,850 1,551 — 1,551 Mortgage related derivatives 46,008 — 46,008 16,917 — 16,917 Total derivatives 49,510 — 49,510 68,515 — 68,515 Repurchase agreements — — — 256,569 — 256,569 Total $ 49,510 $ — $ 49,510 $ 325,084 $ — $ 325,084 Financial Assets Financial Liabilities Net Amount Recognized Financial Instruments Collateral Net Amount Net Amount Recognized Financial Instruments Collateral Net Amount Derivatives: Counterparty A $ 35,142 $ (15,868 ) $ — $ 19,274 $ 15,868 $ (15,868 ) $ — $ — Counterparty B 309 (309 ) — — 11,098 (309 ) (10,789 ) — Counterparty C 7,740 (7,740 ) — — 17,344 (7,740 ) (9,604 ) — Other counterparties 6,319 (6,296 ) — 23 24,205 (6,296 ) (17,886 ) 23 Total derivatives 49,510 (30,213 ) — 19,297 68,515 (30,213 ) (38,279 ) 23 Repurchase agreements — — — — 256,569 — (256,569 ) — Total $ 49,510 $ (30,213 ) $ — $ 19,297 $ 325,084 $ (30,213 ) $ (294,848 ) $ 23 Information about the Company's financial instruments that are eligible for offset in the consolidated balance sheet as of December 31, 2015 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 $ 5,698 $ — $ 5,698 $ 31,446 $ — $ 31,446 Foreign exchange contracts 2,728 — 2,728 1,805 — 1,805 Mortgage related derivatives 1,636 — 1,636 1,087 — 1,087 Total derivatives 10,062 — 10,062 34,338 — 34,338 Repurchase agreements — — — 201,207 — 201,207 Total $ 10,062 $ — $ 10,062 $ 235,545 $ — $ 235,545 Financial Assets Financial Liabilities Net Amount Recognized Financial Instruments Collateral Net Amount Net Amount Recognized Financial Instruments Collateral Net Amount Derivatives: Counterparty A $ 3,810 $ (3,810 ) $ — $ — $ 11,137 $ (3,810 ) $ (7,327 ) $ — Counterparty B 6 (6 ) — — 7,808 (6 ) (7,802 ) — Counterparty C 3,477 (3,477 ) — — 4,963 (3,477 ) (1,486 ) — Other counterparties 2,769 (2,230 ) — 539 10,430 (2,230 ) (8,034 ) 166 Total derivatives 10,062 (9,523 ) — 539 34,338 (9,523 ) (24,649 ) 166 Repurchase agreements — — — — 201,207 — (201,207 ) — Total $ 10,062 $ (9,523 ) $ — $ 539 $ 235,545 $ (9,523 ) $ (225,856 ) $ 166

Operating Segments (Tables)

Operating Segments (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Summary Financial Information for the Reportable Segments	The following tables present summary financial information for the reportable segments (in thousands): Banking Leasing Mortgage Banking Consolidated Three months ended September 30, 2016 Net interest income $ 119,685 $ 2,168 $ 8,918 $ 130,771 Provision for credit losses 4,394 1,964 191 6,549 Non-interest income 40,533 18,759 49,095 108,387 Non-interest expense (1) 117,211 12,604 40,570 170,385 Income tax expense 8,420 2,484 6,901 17,805 Net income $ 30,193 $ 3,875 $ 10,351 $ 44,419 Total assets $ 16,453,379 $ 1,126,847 $ 1,761,656 $ 19,341,882 Three months ended September 30, 2015 Net interest income $ 104,714 $ 2,832 $ 8,423 $ 115,969 Provision for credit losses 4,965 242 151 5,358 Non-interest income 31,572 19,987 30,692 82,251 Non-interest expense (1) 88,276 11,382 34,608 134,266 Income tax expense 12,178 4,398 1,742 18,318 Net income $ 30,867 $ 6,797 $ 2,614 $ 40,278 Total assets $ 12,759,341 $ 956,433 $ 1,234,327 $ 14,950,101 (1) Includes merger related and repositioning expenses of $11.4 million and $389 thousand in the Banking Segment for the three months ended September 30, 2016 and 2015 , respectively. Banking Leasing Mortgage Banking Consolidated Nine months ended September 30, 2016 Net interest income $ 341,445 $ 7,002 $ 24,230 $ 372,677 Provision for credit losses 14,390 2,045 506 16,941 Non-interest income 112,221 53,670 116,189 282,080 Non-interest expense (1) 307,733 35,916 110,442 454,091 Income tax expense 36,120 8,872 11,788 56,780 Net income $ 95,423 $ 13,839 $ 17,683 $ 126,945 Total assets $ 16,453,379 $ 1,126,847 $ 1,761,656 $ 19,341,882 Nine months ended September 30, 2015 Net interest income $ 313,192 $ 8,762 $ 21,883 $ 343,837 Provision for credit losses 12,783 1,598 247 14,628 Non-interest income 94,197 61,383 90,888 246,468 Non-interest expense (1) 271,248 34,866 100,809 406,923 Income tax expense 35,509 13,218 4,686 53,413 Net income $ 87,849 $ 20,463 $ 7,029 $ 115,341 Total assets $ 12,759,341 $ 956,433 $ 1,234,327 $ 14,950,101 (1) Includes merger related and repositioning expenses of $17.2 million and $9.6 million in the Banking Segment for the nine months ended September 30, 2016 and 2015 , respectively.

New Authoritative Accounting 40

New Authoritative Accounting Guidance (Details) $ in Millions	3 Months Ended
	Sep. 30, 2016USD ($)
Accounting Standards Update 2016-09 | New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax benefit	$ 1.8

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 44,419	$ 40,278	$ 126,945	$ 115,341
Less: preferred stock dividends	2,004	2,000	6,004	6,000
Net income available to common stockholders	42,415	38,278	120,941	109,341
Plus: preferred stock dividends on convertible preferred stock	4	0	4	0
Earnings allocated to common stockholders for diluted earnings per common share	$ 42,417	$ 38,276	$ 120,939	$ 109,336
Weighted average shares outstanding for basic earnings per common share (in shares)	77,506,885	74,297,281	74,780,943	74,478,164
Weighted average shares outstanding for diluted earnings per common share (in shares)	78,683,170	75,029,827	75,727,580	75,154,585
Basic earnings per common share (in dollars per share)	$ 0.55	$ 0.52	$ 1.62	$ 1.47
Diluted earnings per common share (in dollars per share)	$ 0.54	$ 0.51	$ 1.60	$ 1.45
Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Distributed earnings allocated to common stock	$ 16,114	$ 12,733	$ 42,984	$ 36,227
Undistributed earnings	28,305	27,545	83,961	79,114
Net income	44,419	40,278	126,945	115,341
Net income available to common stockholders	$ 42,415	$ 38,278	$ 120,941	$ 109,341
Weighted average shares outstanding for basic earnings per common share (in shares)	77,506,885	74,297,281	74,780,943	74,478,164
Dilutive effect of equity awards (in shares)	1,176,285	732,546	946,637	676,421
Weighted average shares outstanding for diluted earnings per common share (in shares)	78,683,170	75,029,827	75,727,580	75,154,585
Participating Securities
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Less: earnings allocated to participating securities	$ 2	$ 2	$ 6	$ 5

Business Combinations (Details)

Business Combinations (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 993,799	$ 725,070
MSA Holdings, LLC
Business Acquisition [Line Items]
Percent of business acquired		100.00%
Goodwill		$ 13,500
Other intangibles		$ 8,800

Business Combinations (Details

Business Combinations (Details 1) - USD ($)		Aug. 24, 2016	Nov. 20, 2015	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition [Line Items]
Accretable discount on loans				$ 25,426,000	$ 26,365,000
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
Acquisition costs incurred		1,800,000
American Chartered Bancorp, Inc. | Purchased Credit-Impaired Loans
Business Acquisition [Line Items]
Best estimate of contractual cash flows not expected to be collected		4,300,000
Accretable discount		805,000
American Chartered Bancorp, Inc. | Substandard
Business Acquisition [Line Items]
Accretable discount on loans		$ 29,000,000
American Chartered Bancorp, Inc. | Common Stock
Business Acquisition [Line Items]
Stock issued (in shares)	[1]	9,744,636
American Chartered Bancorp, Inc.
Business Acquisition [Line Items]
Amount called by each warrant or right (in dollars per share)			$ 9.30
Amount paid for each fractional share (in dollars per share)			$ 39.01
American Chartered Bancorp, Inc. | Common Stock
Business Acquisition [Line Items]
Number of securities called by each warrant (in shares)			0.2732
Series D Preferred Stock | American Chartered Bancorp, Inc.
Business Acquisition [Line Items]
Preferred stock, dividend rate (percent)		8.00%
Series B Preferred Stock
Business Acquisition [Line Items]
Preferred stock, dividend rate (percent)				8.00%
Series B Preferred Stock | American Chartered Bancorp, Inc.
Business Acquisition [Line Items]
Preferred stock, dividend rate (percent)		8.00%
Number of securities called by each warrant (in shares)		1
[1]	Per share fair value amount determined as if the shares of Series B were converted into shares common stock.

Business Combinations (Detail44

Business Combinations (Details 2) - USD ($) $ / shares in Units, $ in Thousands		Aug. 24, 2016	Sep. 30, 2016	Dec. 31, 2015
ASSETS
Goodwill			$ 993,799	$ 725,070
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		1,952,826
Premises and equipment		39,061
Cash surrender value of life insurance		59,917
Goodwill		268,758
Other intangibles		25,500
Other real estate owned		4,148
Other assets		27,615
Total assets		2,992,696
LIABILITIES
Deposits		2,389,423
Long-term borrowings		48,305
Junior subordinated notes issued to capital trusts		16,000
Accrued expenses and other liabilities		23,477
Total liabilities		2,505,280
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
Junior subordinated notes issued to capital trusts		$ 28,075
[1]	Per share fair value amount determined as if the shares of Series B were converted into shares common stock.

Business Combinations (Detail45

Business Combinations (Details 3) - American Chartered Bancorp, Inc. $ in Thousands	Aug. 24, 2016USD ($)
Purchased Credit-Impaired Loans
Business Acquisition [Line Items]
Fair value	$ 24,575
Gross contractual amounts receivable	31,408
Best estimate of contractual cash flows not expected to be collected	5,048	[1]
Best estimate of contractual cash flows expected to be collected	26,360
Purchased Non-Credit-Impaired Loans
Business Acquisition [Line Items]
Fair value	1,928,251
Gross contractual amounts receivable	2,207,765
Best estimate of contractual cash flows not expected to be collected	129,027	[1]
Best estimate of contractual cash flows expected to be collected	$ 2,078,738
[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 default.

Business Combinations (Detail46

Business Combinations (Details 4) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Business Combinations [Abstract]
Total revenues (net interest income plus non-interest income	$ 256,866	$ 228,099	$ 731,987	$ 678,735
Net income	$ 48,432	$ 50,581	$ 147,078	$ 141,751

Investment Securities (Details)

Investment Securities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Available for Sale
Amortized Cost	$ 1,817,165	$ 1,558,956
Gross Unrealized Gains	44,940	33,910
Gross Unrealized Losses	(2,749)	(7,843)
Fair Value	1,859,356	1,585,023
Held to Maturity
Amortized Cost	1,115,262	1,230,810
Gross Unrealized Gains	60,609	44,595
Gross Unrealized Losses	(33)	(638)
Fair Value	1,175,838	1,274,767
Total Available for Sale and Held to Maturity Investment Securities
Amortized Cost	2,932,427	2,789,766
Gross Unrealized Gains	105,549	78,505
Gross Unrealized Losses	(2,782)	(8,481)
Fair Value	3,035,194	2,859,790
U.S. Government sponsored agencies and enterprises
Available for Sale
Amortized Cost	53,456	63,805
Gross Unrealized Gains	512	806
Gross Unrealized Losses	0	0
Fair Value	53,968	64,611
States and political subdivisions
Available for Sale
Amortized Cost	383,041	373,285
Gross Unrealized Gains	27,914	23,083
Gross Unrealized Losses	(218)	(1)
Fair Value	410,737	396,367
Held to Maturity
Amortized Cost	939,491	1,016,519
Gross Unrealized Gains	53,682	36,874
Gross Unrealized Losses	(33)	(638)
Fair Value	$ 993,140	1,052,755
Total Available for Sale and Held to Maturity Investment Securities
Percentage of securities consisting general obligation issues	97.00%
Percentage of securities insured	48.00%
States and political subdivisions | State of Illinois
Total Available for Sale and Held to Maturity Investment Securities
Percentage of investments issued by states and political subdivisions that were within the state of Illinois	21.00%
Residential mortgage-backed securities
Available for Sale
Amortized Cost	$ 1,066,834	759,816
Gross Unrealized Gains	10,948	7,363
Gross Unrealized Losses	(1,445)	(3,630)
Fair Value	1,076,337	763,549
Held to Maturity
Amortized Cost	175,771	214,291
Gross Unrealized Gains	6,927	7,721
Gross Unrealized Losses	0	0
Fair Value	182,698	222,012
Commercial mortgage-backed securities
Available for Sale
Amortized Cost	93,962	128,509
Gross Unrealized Gains	3,203	1,839
Gross Unrealized Losses	(172)	(241)
Fair Value	96,993	130,107
Corporate bonds
Available for Sale
Amortized Cost	208,940	222,784
Gross Unrealized Gains	2,167	815
Gross Unrealized Losses	(914)	(3,971)
Fair Value	210,193	219,628
Equity securities
Available for Sale
Amortized Cost	10,932	10,757
Gross Unrealized Gains	196	4
Gross Unrealized Losses	0	0
Fair Value	$ 11,128	$ 10,761

Investment Securities (Details

Investment Securities (Details 2) $ in Thousands	Sep. 30, 2016USD ($)Security_Position	Dec. 31, 2015USD ($)Security_Position
Available for Sale
Less Than 12 Months, Fair Value	$ 404,743	$ 434,194
Less Than 12 Months, Unrealized Losses	(1,588)	(4,005)
12 Months or More, Fair Value	59,313	73,661
12 Months or More, Unrealized Losses	(1,161)	(3,838)
Total Fair Value	464,056	507,855
Total Unrealized Losses	(2,749)	(7,843)
Total
Less Than 12 Months, Fair Value	435,885	500,346
Less Than 12 Months, Unrealized Losses	(1,620)	(4,524)
12 Months or More, Fair Value	59,700	79,851
12 Months or More, Unrealized Losses	(1,162)	(3,957)
Total Fair Value	495,585	580,197
Total Unrealized Losses	$ (2,782)	$ (8,481)
Number of security positions in the investment portfolio in an unrealized loss position | Security_Position	271	193
States and political subdivisions
Available for Sale
Less Than 12 Months, Fair Value	$ 20,526	$ 219
Less Than 12 Months, Unrealized Losses	(218)	(1)
12 Months or More, Fair Value	0	0
12 Months or More, Unrealized Losses	0	0
Total Fair Value	20,526	219
Total Unrealized Losses	(218)	(1)
Held to Maturity
Less Than 12 Months, Fair Value	31,142	66,152
Less Than 12 Months, Unrealized Losses	(32)	(519)
12 Months or More, Fair Value	387	6,190
12 Months or More, Unrealized Losses	(1)	(119)
Total Fair Value	31,529	72,342
Total Unrealized Losses	(33)	(638)
Residential mortgage-backed securities
Available for Sale
Less Than 12 Months, Fair Value	374,312	357,877
Less Than 12 Months, Unrealized Losses	(1,214)	(2,835)
12 Months or More, Fair Value	27,699	43,566
12 Months or More, Unrealized Losses	(231)	(795)
Total Fair Value	402,011	401,443
Total Unrealized Losses	(1,445)	(3,630)
Commercial mortgage-backed securities
Available for Sale
Less Than 12 Months, Fair Value	71	2,324
Less Than 12 Months, Unrealized Losses	(1)	(5)
12 Months or More, Fair Value	11,664	11,809
12 Months or More, Unrealized Losses	(171)	(236)
Total Fair Value	11,735	14,133
Total Unrealized Losses	(172)	(241)
Corporate bonds
Available for Sale
Less Than 12 Months, Fair Value	9,834	73,774
Less Than 12 Months, Unrealized Losses	(155)	(1,164)
12 Months or More, Fair Value	19,950	18,286
12 Months or More, Unrealized Losses	(759)	(2,807)
Total Fair Value	29,784	92,060
Total Unrealized Losses	$ (914)	$ (3,971)

Investment Securities (Detail49

Investment Securities (Details 3) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Amortized cost and fair value of investment securities by contractual maturity
Realized gains	$ 0	$ 371,000	$ 323,000	$ 1,454,000
Realized losses	0	0	(54,000)	(1,627,000)
Net gains (losses)	0	$ 371,000	269,000	$ (173,000)
Amortized Cost, Available for sale
Due in one year or less	81,215,000		81,215,000
Due after one year through five years	267,485,000		267,485,000
Due after five years through ten years	44,899,000		44,899,000
Due after ten years	251,838,000		251,838,000
Amortized Cost	1,817,165,000		1,817,165,000		$ 1,558,956,000
Fair Value, Available for sale
Due in one year or less	81,620,000		81,620,000
Due after one year through five years	273,115,000		273,115,000
Due after five years through ten years	46,964,000		46,964,000
Due after ten years	273,199,000		273,199,000
Fair Value	1,859,356,000		1,859,356,000		1,585,023,000
Amortized Cost, Held to maturity
Due in one year or less	87,409,000		87,409,000
Due after one year through five years	146,995,000		146,995,000
Due after five years through ten years	159,780,000		159,780,000
Due after ten years	545,307,000		545,307,000
Investment securities held to maturity	1,115,262,000		1,115,262,000		1,230,810,000
Fair value, Held to maturity
Due in one year or less	87,524,000		87,524,000
Due after one year through five years	151,557,000		151,557,000
Due after five years through ten years	171,871,000		171,871,000
Due after ten years	582,188,000		582,188,000
Fair Value	1,175,838,000		1,175,838,000		1,274,767,000
Total Available for Sale and Held to Maturity Investment Securities
Amortized Cost	2,932,427,000		2,932,427,000		2,789,766,000
Fair Value	3,035,194,000		3,035,194,000		2,859,790,000
Pledged financial instruments, not separately reported, securities	1,200,000,000		1,200,000,000		1,400,000,000
Pledged financial instruments, not separately reported, securities required to be pledged	839,300,000		839,300,000		878,200,000
Investment securities pledged as collateral for long-term Federal Home Loan Bank advances	0		0		108,800,000
Equity securities
Amortized Cost, Available for sale
Amortized Cost	10,932,000		10,932,000		10,757,000
Fair Value, Available for sale
Fair Value	11,128,000		11,128,000		10,761,000
Residential and commercial mortgage-backed securities
Amortized Cost, Available for sale
Amortized Cost	1,160,796,000		1,160,796,000
Fair Value, Available for sale
Fair Value	1,173,330,000		1,173,330,000
Residential mortgage-backed securities
Amortized Cost, Available for sale
Amortized Cost	1,066,834,000		1,066,834,000		759,816,000
Fair Value, Available for sale
Fair Value	1,076,337,000		1,076,337,000		763,549,000
Amortized Cost, Held to maturity
Investment securities held to maturity	175,771,000		175,771,000		214,291,000
Fair value, Held to maturity
Fair Value	$ 182,698,000		$ 182,698,000		$ 222,012,000

Loans (Details)

Loans (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)Investment_Rating	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)
Loans
Total loans, excluding purchased credit impaired loans	$ 12,379,358	$ 9,652,592
Purchased credit-impaired loans	161,338	141,406
Total loans	$ 12,540,696	9,793,998	$ 9,389,181
Number of highest rating categories by rating services company | Investment_Rating	1
Number of highest rating categories to be achieved for classification as investment grade companies | Investment_Rating	4
Percentage of collateral pledge of first mortgage loans as per agreement (minimum)	133.00%
Percentage of collateral pledge of home equity loans as per agreement	250.00%
Loans pledged as collateral for long-term Federal Home Loan Bank advances	$ 4,900,000	3,200,000
Loans required to be pledged as collateral for long-term Federal Home Loan Bank advances	3,100,000	2,200,000
Commercial loans
Loans
Total loans, excluding purchased credit impaired loans	4,385,812	3,616,286
Total loans	4,408,725		3,477,821
Commercial loans collateralized by assignment of lease payments
Loans
Total loans, excluding purchased credit impaired loans	1,873,380	1,779,072
Total loans	1,873,380		1,693,540
Commercial real estate
Loans
Total loans, excluding purchased credit impaired loans	3,794,801	2,695,676
Total loans	3,836,087		2,627,812
Residential real estate
Loans
Total loans, excluding purchased credit impaired loans	998,827	628,169
Total loans	1,065,525		650,906
Construction real estate
Loans
Total loans, excluding purchased credit impaired loans	451,023	252,060
Total loans	465,154		267,992
Indirect vehicle
Loans
Total loans, excluding purchased credit impaired loans	522,271	384,095
Total loans	522,271		345,731
Home equity
Loans
Total loans, excluding purchased credit impaired loans	275,288	216,573
Other consumer loans
Loans
Total loans, excluding purchased credit impaired loans	77,956	$ 80,661
Total loans	$ 80,380		$ 90,220

Loans (Details 2)

Loans (Details 2) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Contractual aging of the recorded investment in loans
Total loans, excluding covered loans	$ 12,379,358	$ 9,652,592
Total loans	$ 12,540,696	9,793,998	$ 9,389,181
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Period past due of recorded investment in loans (in days)	90 days
Non-performing loan aging
Contractual aging of the recorded investment in loans
Current	$ 31,009	44,290
Past Due	22,900	60,371
Total loans	53,909	104,661
30-59 Days Past Due | Non-performing loan aging
Contractual aging of the recorded investment in loans
Past Due	373	9,827
60-89 Days Past Due | Non-performing loan aging
Contractual aging of the recorded investment in loans
Past Due	1,801	9,367
Loans Past Due 90 Days or More | Non-performing loan aging
Contractual aging of the recorded investment in loans
Past Due	20,726	41,177
Commercial
Contractual aging of the recorded investment in loans
Current	4,376,819	3,586,372
Past Due	8,993	29,914
Total loans, excluding covered loans	4,385,812	3,616,286
Total loans	4,408,725		3,477,821
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	8,583	24,689
Loans past due 90 days or more and still accruing	1,166	42
Commercial | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,649	22,956
Commercial | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	104	97
Commercial | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	6,240	6,861
Commercial loans collateralized by assignment of lease payments
Contractual aging of the recorded investment in loans
Current	1,855,322	1,758,839
Past Due	18,058	20,233
Total loans, excluding covered loans	1,873,380	1,779,072
Total loans	1,873,380		1,693,540
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	4,996	7,027
Loans past due 90 days or more and still accruing	153	5,318
Commercial loans collateralized by assignment of lease payments | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	12,141	3,399
Commercial loans collateralized by assignment of lease payments | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	4,672	5,902
Commercial loans collateralized by assignment of lease payments | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	1,245	10,932
Healthcare
Contractual aging of the recorded investment in loans
Current	572,228	476,939
Past Due	0	0
Total loans, excluding covered loans	572,228	476,939
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	0	0
Loans past due 90 days or more and still accruing	0	0
Healthcare | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Healthcare | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Healthcare | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	0	0
Industrial
Contractual aging of the recorded investment in loans
Current	854,045	400,182
Past Due	1,587	757
Total loans, excluding covered loans	855,632	400,939
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	278	1,136
Loans past due 90 days or more and still accruing	0	0
Industrial | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	298	0
Industrial | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	1,289	0
Industrial | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	0	757
Multifamily
Contractual aging of the recorded investment in loans
Current	549,486	399,333
Past Due	620	1,644
Total loans, excluding covered loans	550,106	400,977
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	2,648	3,415
Loans past due 90 days or more and still accruing	0	0
Multifamily | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	141	622
Multifamily | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	366	88
Multifamily | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	113	934
Retail
Contractual aging of the recorded investment in loans
Current	522,696	410,958
Past Due	1,021	13,780
Total loans, excluding covered loans	523,717	424,738
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	607	17,594
Loans past due 90 days or more and still accruing	0	0
Retail | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	333	6,189
Retail | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	235	7,411
Retail | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	453	180
Office
Contractual aging of the recorded investment in loans
Current	416,965	223,935
Past Due	1,385	5,247
Total loans, excluding covered loans	418,350	229,182
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	447	4,496
Loans past due 90 days or more and still accruing	0	693
Office | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	1,336	58
Office | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	49	0
Office | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	0	5,189
Other
Contractual aging of the recorded investment in loans
Current	871,881	760,530
Past Due	2,887	2,371
Total loans, excluding covered loans	874,768	762,901
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	531	1,544
Loans past due 90 days or more and still accruing	144	195
Other | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	1,646	622
Other | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	532	82
Other | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	709	1,667
Residential real estate
Contractual aging of the recorded investment in loans
Current	986,386	612,573
Past Due	12,441	15,596
Total loans, excluding covered loans	998,827	628,169
Total loans	1,065,525		650,906
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	16,781	17,951
Loans past due 90 days or more and still accruing	220	253
Residential real estate | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,347	5,193
Residential real estate | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	1,739	1,729
Residential real estate | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	8,355	8,674
Construction real estate
Contractual aging of the recorded investment in loans
Current	451,023	252,060
Past Due	0	0
Total loans, excluding covered loans	451,023	252,060
Total loans	465,154		267,992
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	0	0
Loans past due 90 days or more and still accruing	0	0
Construction real estate | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Construction real estate | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	0	0
Construction real estate | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	0	0
Indirect vehicle
Contractual aging of the recorded investment in loans
Current	518,881	380,899
Past Due	3,390	3,196
Total loans, excluding covered loans	522,271	384,095
Total loans	522,271		345,731
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	1,955	2,046
Loans past due 90 days or more and still accruing	0	0
Indirect vehicle | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	2,301	2,085
Indirect vehicle | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	716	698
Indirect vehicle | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	373	413
Home equity
Contractual aging of the recorded investment in loans
Current	270,028	207,818
Past Due	5,260	8,755
Total loans, excluding covered loans	275,288	216,573
Total loans	289,174		235,159
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	15,300	18,156
Loans past due 90 days or more and still accruing	0	0
Home equity | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	1,475	1,774
Home equity | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	490	1,398
Home equity | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	3,295	5,583
Other consumer
Contractual aging of the recorded investment in loans
Current	77,570	80,225
Past Due	386	436
Total loans, excluding covered loans	77,956	80,661
Total loans	80,380		$ 90,220
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	9	11
Loans past due 90 days or more and still accruing	91	95
Other consumer | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	166	254
Other consumer | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	129	84
Other consumer | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	91	98
Total loans, excluding purchased credit-impaired loans
Contractual aging of the recorded investment in loans
Current	12,323,330	9,550,663
Past Due	56,028	101,929
Total loans, excluding covered loans	12,379,358	9,652,592
Total loans, excluding purchased credit-impaired loans | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	24,833	43,152
Total loans, excluding purchased credit-impaired loans | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	10,321	17,489
Total loans, excluding purchased credit-impaired loans | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	20,874	41,288
Purchased credit-impaired loans
Contractual aging of the recorded investment in loans
Current	92,346	81,250
Past Due	68,992	60,156
Total loans	161,338	141,406
Purchased credit-impaired loans | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	1,108	3,311
Purchased credit-impaired loans | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	5,848	4,439
Purchased credit-impaired loans | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	62,036	52,406
Total loans
Contractual aging of the recorded investment in loans
Current	12,415,676	9,631,913
Past Due	125,020	162,085
Total loans	12,540,696	9,793,998
Recorded investment in nonaccrual loans and loans past due ninety days or more and still accruing
Non-accrual	52,135	98,065
Loans past due 90 days or more and still accruing	1,774	6,596
Total loans | 30-59 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	25,941	46,463
Total loans | 60-89 Days Past Due
Contractual aging of the recorded investment in loans
Past Due	16,169	21,928
Total loans | Loans Past Due 90 Days or More
Contractual aging of the recorded investment in loans
Past Due	$ 82,910	$ 93,694

Loans (Details 3)

Loans (Details 3) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Loans
Total loans, excluding purchased credit impaired loans	$ 12,379,358	$ 9,652,592
Substandard and doubtful loans non-performing	18,100	59,600
Commercial
Loans
Total loans, excluding purchased credit impaired loans	4,385,812	3,616,286
Commercial loans collateralized by assignment of lease payments
Loans
Total loans, excluding purchased credit impaired loans	1,873,380	1,779,072
Healthcare
Loans
Total loans, excluding purchased credit impaired loans	572,228	476,939
Industrial
Loans
Total loans, excluding purchased credit impaired loans	855,632	400,939
Multifamily
Loans
Total loans, excluding purchased credit impaired loans	550,106	400,977
Retail
Loans
Total loans, excluding purchased credit impaired loans	523,717	424,738
Office
Loans
Total loans, excluding purchased credit impaired loans	418,350	229,182
Other
Loans
Total loans, excluding purchased credit impaired loans	874,768	762,901
Construction real estate
Loans
Total loans, excluding purchased credit impaired loans	451,023	252,060
Pass
Loans
Total loans, excluding purchased credit impaired loans	10,157,718	7,976,433
Pass | Commercial
Loans
Total loans, excluding purchased credit impaired loans	4,163,243	3,373,943
Pass | Commercial loans collateralized by assignment of lease payments
Loans
Total loans, excluding purchased credit impaired loans	1,859,012	1,760,674
Pass | Healthcare
Loans
Total loans, excluding purchased credit impaired loans	555,166	472,599
Pass | Industrial
Loans
Total loans, excluding purchased credit impaired loans	831,090	380,200
Pass | Multifamily
Loans
Total loans, excluding purchased credit impaired loans	546,183	396,117
Pass | Retail
Loans
Total loans, excluding purchased credit impaired loans	514,299	393,543
Pass | Office
Loans
Total loans, excluding purchased credit impaired loans	409,124	216,584
Pass | Other
Loans
Total loans, excluding purchased credit impaired loans	828,578	730,713
Pass | Construction real estate
Loans
Total loans, excluding purchased credit impaired loans	451,023	252,060
Special Mention
Loans
Total loans, excluding purchased credit impaired loans	217,609	167,161
Special Mention | Commercial
Loans
Total loans, excluding purchased credit impaired loans	131,163	115,548
Special Mention | Commercial loans collateralized by assignment of lease payments
Loans
Total loans, excluding purchased credit impaired loans	5,504	4,367
Special Mention | Healthcare
Loans
Total loans, excluding purchased credit impaired loans	17,062	4,340
Special Mention | Industrial
Loans
Total loans, excluding purchased credit impaired loans	23,751	19,011
Special Mention | Multifamily
Loans
Total loans, excluding purchased credit impaired loans	312	595
Special Mention | Retail
Loans
Total loans, excluding purchased credit impaired loans	8,646	13,310
Special Mention | Office
Loans
Total loans, excluding purchased credit impaired loans	5,086	3,797
Special Mention | Other
Loans
Total loans, excluding purchased credit impaired loans	26,085	6,193
Special Mention | Construction real estate
Loans
Total loans, excluding purchased credit impaired loans	0	0
Substandard
Loans
Total loans, excluding purchased credit impaired loans	129,689	199,500
Substandard | Commercial
Loans
Total loans, excluding purchased credit impaired loans	91,406	126,795
Substandard | Commercial loans collateralized by assignment of lease payments
Loans
Total loans, excluding purchased credit impaired loans	8,864	14,031
Substandard | Healthcare
Loans
Total loans, excluding purchased credit impaired loans	0	0
Substandard | Industrial
Loans
Total loans, excluding purchased credit impaired loans	791	1,728
Substandard | Multifamily
Loans
Total loans, excluding purchased credit impaired loans	3,611	4,265
Substandard | Retail
Loans
Total loans, excluding purchased credit impaired loans	772	17,885
Substandard | Office
Loans
Total loans, excluding purchased credit impaired loans	4,140	8,801
Substandard | Other
Loans
Total loans, excluding purchased credit impaired loans	20,105	25,995
Substandard | Construction real estate
Loans
Total loans, excluding purchased credit impaired loans	0	0
Doubtful
Loans
Total loans, excluding purchased credit impaired loans	0	0
Doubtful | Commercial
Loans
Total loans, excluding purchased credit impaired loans	0	0
Doubtful | Commercial loans collateralized by assignment of lease payments
Loans
Total loans, excluding purchased credit impaired loans	0	0
Doubtful | Healthcare
Loans
Total loans, excluding purchased credit impaired loans	0	0
Doubtful | Industrial
Loans
Total loans, excluding purchased credit impaired loans	0	0
Doubtful | Multifamily
Loans
Total loans, excluding purchased credit impaired loans	0	0
Doubtful | Retail
Loans
Total loans, excluding purchased credit impaired loans	0	0
Doubtful | Office
Loans
Total loans, excluding purchased credit impaired loans	0	0
Doubtful | Other
Loans
Total loans, excluding purchased credit impaired loans	0	0
Doubtful | Construction real estate
Loans
Total loans, excluding purchased credit impaired loans	0	0
Total
Loans
Total loans, excluding purchased credit impaired loans	10,505,016	8,343,094
Total | Commercial
Loans
Total loans, excluding purchased credit impaired loans	4,385,812	3,616,286
Total | Commercial loans collateralized by assignment of lease payments
Loans
Total loans, excluding purchased credit impaired loans	1,873,380	1,779,072
Total | Healthcare
Loans
Total loans, excluding purchased credit impaired loans	572,228	476,939
Total | Industrial
Loans
Total loans, excluding purchased credit impaired loans	855,632	400,939
Total | Multifamily
Loans
Total loans, excluding purchased credit impaired loans	550,106	400,977
Total | Retail
Loans
Total loans, excluding purchased credit impaired loans	523,717	424,738
Total | Office
Loans
Total loans, excluding purchased credit impaired loans	418,350	229,182
Total | Other
Loans
Total loans, excluding purchased credit impaired loans	874,768	762,901
Total | Construction real estate
Loans
Total loans, excluding purchased credit impaired loans	$ 451,023	$ 252,060

Loans (Details 4)

Loans (Details 4) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Loans
Total loans, excluding purchased credit impaired loans	$ 12,379,358	$ 9,652,592
Mortgage loans in process of foreclosure	23,600	20,800
Residential real estate
Loans
Total loans, excluding purchased credit impaired loans	998,827	628,169
Indirect vehicle
Loans
Total loans, excluding purchased credit impaired loans	522,271	384,095
Home equity
Loans
Total loans, excluding purchased credit impaired loans	275,288	216,573
Other consumer loans
Loans
Total loans, excluding purchased credit impaired loans	77,956	80,661
Total
Loans
Total loans, excluding purchased credit impaired loans	1,874,342	1,309,498
Performing | Residential real estate
Loans
Total loans, excluding purchased credit impaired loans	981,826	609,965
Performing | Indirect vehicle
Loans
Total loans, excluding purchased credit impaired loans	520,316	382,049
Performing | Home equity
Loans
Total loans, excluding purchased credit impaired loans	259,988	198,417
Performing | Other consumer loans
Loans
Total loans, excluding purchased credit impaired loans	77,856	80,555
Performing | Total
Loans
Total loans, excluding purchased credit impaired loans	1,839,986	1,270,986
Non-performing | Residential real estate
Loans
Total loans, excluding purchased credit impaired loans	17,001	18,204
Non-performing | Indirect vehicle
Loans
Total loans, excluding purchased credit impaired loans	1,955	2,046
Non-performing | Home equity
Loans
Total loans, excluding purchased credit impaired loans	15,300	18,156
Non-performing | Other consumer loans
Loans
Total loans, excluding purchased credit impaired loans	100	106
Non-performing | Total
Loans
Total loans, excluding purchased credit impaired loans	$ 34,356	$ 38,512

Loans (Details 5)

Loans (Details 5) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2016USD ($)loan	Sep. 30, 2016USD ($)loan	Dec. 31, 2015USD ($)loan
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	$ 80,998	$ 80,998	$ 117,644
Recorded Investment	74,537	74,537	114,465
Partial Charge-offs	6,461	6,461	3,179
Allowance for Loan Losses Allocated	15,343	15,343	21,937
Average Recorded Investment	75,218	90,421	108,854
Interest Income Recognized	27	45	$ 202
Restructured loans	$ 21,385	$ 21,385
Minimum period of sustained repayment required to return note to accrual status		6 months
Restructured loans number of A and B structures | loan	1	1	1
Restructured loans representing A And B structures	$ 943	$ 943	$ 1,000
Commercial
Loans individually evaluated for impairment by class of loans
Restructured loans	16,351	16,351
Commercial | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	1,808	1,808	11,253
Recorded Investment	1,808	1,808	11,253
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	1,871	2,377	6,628
Interest Income Recognized	0	0	0
Commercial | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	17,476	17,476	23,394
Recorded Investment	17,476	17,476	23,394
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	5,401	5,401	7,523
Average Recorded Investment	19,180	26,513	18,820
Interest Income Recognized	0	0	0
Commercial loans collateralized by assignment of lease payments
Loans individually evaluated for impairment by class of loans
Restructured loans	0	0
Commercial loans collateralized by assignment of lease payments | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	1,161	1,161	3,453
Recorded Investment	794	794	2,949
Partial Charge-offs	367	367	504
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	1,141	1,026	1,035
Interest Income Recognized	27	27	54
Commercial loans collateralized by assignment of lease payments | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	7,260	7,260	3,297
Recorded Investment	7,260	7,260	3,297
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	3,933	3,933	1,790
Average Recorded Investment	5,086	3,201	4,013
Interest Income Recognized	0	18	104
Healthcare
Loans individually evaluated for impairment by class of loans
Restructured loans	0	0
Healthcare | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of 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
Healthcare | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of 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
Industrial
Loans individually evaluated for impairment by class of loans
Restructured loans	0	0
Industrial | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0	820
Recorded Investment	0	0	757
Partial Charge-offs	0	0	63
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	536	3,467
Interest Income Recognized	0	0	0
Industrial | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of 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	228
Interest Income Recognized	0	0	0
Multifamily
Loans individually evaluated for impairment by class of loans
Restructured loans	0	0
Multifamily | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	1,981	1,981	575
Recorded Investment	1,981	1,981	575
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	2,334	2,362	1,540
Interest Income Recognized	0	0	17
Multifamily | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0	2,155
Recorded Investment	0	0	2,155
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	17
Average Recorded Investment	0	0	3,307
Interest Income Recognized	0	0	27
Retail
Loans individually evaluated for impairment by class of loans
Restructured loans	0	0
Retail | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	2,683	2,683	7,872
Recorded Investment	943	943	6,131
Partial Charge-offs	1,740	1,740	1,741
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	949	2,577	2,768
Interest Income Recognized	0	0	0
Retail | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	3,606	3,606	16,034
Recorded Investment	3,606	3,606	16,034
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	363	363	4,926
Average Recorded Investment	3,612	7,911	8,885
Interest Income Recognized	0	0	0
Office
Loans individually evaluated for impairment by class of loans
Restructured loans	0	0
Office | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0	1,608
Recorded Investment	0	0	1,031
Partial Charge-offs	0	0	577
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	342	1,663
Interest Income Recognized	0	0	0
Office | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0	2,929
Recorded Investment	0	0	2,929
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	1,717
Average Recorded Investment	0	995	2,457
Interest Income Recognized	0	0	0
Other
Loans individually evaluated for impairment by class of loans
Restructured loans	0	0
Other | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of 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	80	965
Interest Income Recognized	0	0	0
Other | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0	592
Recorded Investment	0	0	592
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	199
Average Recorded Investment	0	314	9,629
Interest Income Recognized	0	0	0
Residential real estate
Loans individually evaluated for impairment by class of loans
Restructured loans	740	740
Residential real estate | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0	970
Recorded Investment	0	0	970
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	717
Interest Income Recognized	0	0	0
Residential real estate | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	15,117	15,117	12,950
Recorded Investment	13,268	13,268	12,769
Partial Charge-offs	1,849	1,849	181
Allowance for Loan Losses Allocated	2,394	2,394	2,634
Average Recorded Investment	13,325	13,068	13,484
Interest Income Recognized	0	0	0
Construction real estate
Loans individually evaluated for impairment by class of loans
Restructured loans	0	0
Construction real estate | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of 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
Construction real estate | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of 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	214
Interest Income Recognized	0	0	0
Indirect vehicle
Loans individually evaluated for impairment by class of loans
Restructured loans	183	183
Indirect vehicle | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	218	218	0
Recorded Investment	125	125	0
Partial Charge-offs	93	93	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	277	292	0
Interest Income Recognized	0	0	0
Indirect vehicle | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0	119
Recorded Investment	0	0	119
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	0	287
Interest Income Recognized	0	0	0
Home equity
Loans individually evaluated for impairment by class of loans
Restructured loans	4,111	4,111
Home equity | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	0	0	927
Recorded Investment	0	0	927
Partial Charge-offs	0	0	0
Allowance for Loan Losses Allocated	0	0	0
Average Recorded Investment	0	192	1,000
Interest Income Recognized	0	0	0
Home equity | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of loans
Unpaid Principal Balance	29,688	29,688	28,696
Recorded Investment	27,276	27,276	28,583
Partial Charge-offs	2,412	2,412	113
Allowance for Loan Losses Allocated	3,252	3,252	3,131
Average Recorded Investment	27,443	28,635	27,747
Interest Income Recognized	0	0	0
Other consumer
Loans individually evaluated for impairment by class of loans
Restructured loans	0	0
Other consumer | Impaired Financing Receivable With No Allowance
Loans individually evaluated for impairment by class of 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
Other consumer | Impaired Financing Receivable With Allowance
Loans individually evaluated for impairment by class of 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
Performing
Loans individually evaluated for impairment by class of loans
Restructured loans	28,561	28,561	26,991
Non-performing
Loans individually evaluated for impairment by class of loans
Restructured loans	$ 23,397	$ 23,397	$ 23,619

Loans (Details 6)

Loans (Details 6) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)loan	Sep. 30, 2015USD ($)loan	Sep. 30, 2016USD ($)loan	Sep. 30, 2015USD ($)loan
Restructured loans
Redefaulted loans			$ 224
Period past due of recorded redefaulted loans (in days)			90 days
Performing
Restructured loans
Number of Loans | loan	4	4	7	17
Pre-Modification Recorded Investment	$ 203	$ 477	$ 2,482	$ 4,370
Post-Modification Recorded Investment	203	477	2,482	4,370
Charge-offs and Specific Reserves	$ 30	$ 0	$ 442	$ 0
Performing | Commercial
Restructured loans
Number of Loans | loan			1	1
Pre-Modification Recorded Investment			$ 1,870	$ 80
Post-Modification Recorded Investment			1,870	80
Charge-offs and Specific Reserves			$ 412	$ 0
Performing | Residential real estate
Restructured loans
Number of Loans | loan	2		2
Pre-Modification Recorded Investment	$ 101		$ 101
Post-Modification Recorded Investment	101		101
Charge-offs and Specific Reserves	$ 18		$ 18
Performing | Home equity
Restructured loans
Number of Loans | loan	2	4	4	16
Pre-Modification Recorded Investment	$ 102	$ 477	$ 511	$ 4,290
Post-Modification Recorded Investment	102	477	511	4,290
Charge-offs and Specific Reserves	$ 12	$ 0	$ 12	$ 0
Non-performing
Restructured loans
Number of Loans | loan	19	11	66	24
Pre-Modification Recorded Investment	$ 6,881	$ 595	$ 18,903	$ 1,897
Post-Modification Recorded Investment	6,881	595	18,903	1,897
Charge-offs and Specific Reserves	$ 1,664	$ 24	$ 5,273	$ 170
Non-performing | Commercial
Restructured loans
Number of Loans | loan	3		7
Pre-Modification Recorded Investment	$ 5,874		$ 14,481
Post-Modification Recorded Investment	5,874		14,481
Charge-offs and Specific Reserves	$ 1,490		$ 4,990
Non-performing | Multifamily
Restructured loans
Number of Loans | loan				1
Pre-Modification Recorded Investment				$ 334
Post-Modification Recorded Investment				334
Charge-offs and Specific Reserves				$ 0
Non-performing | Residential real estate
Restructured loans
Number of Loans | loan	4		6	1
Pre-Modification Recorded Investment	$ 484		$ 639	$ 140
Post-Modification Recorded Investment	484		639	140
Charge-offs and Specific Reserves	$ 85		$ 85	$ 17
Non-performing | Indirect vehicle
Restructured loans
Number of Loans | loan	7	7	25	13
Pre-Modification Recorded Investment	$ 34	$ 45	$ 183	$ 75
Post-Modification Recorded Investment	34	45	183	75
Charge-offs and Specific Reserves	$ 17	$ 16	$ 60	$ 23
Non-performing | Home equity
Restructured loans
Number of Loans | loan	5	4	28	9
Pre-Modification Recorded Investment	$ 489	$ 550	$ 3,600	$ 1,348
Post-Modification Recorded Investment	489	550	3,600	1,348
Charge-offs and Specific Reserves	$ 72	$ 8	$ 138	$ 130

Loans (Details 7)

Loans (Details 7) $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)
Financing Receivable, Modifications, Post Modification Recorded Investment [Roll Forward]
Ending balance	$ 21,385
Performing
Financing Receivable, Modifications, Post Modification Recorded Investment [Roll Forward]
Beginning balance	26,991
Additions	2,482
Charge-offs	0
Principal payments, net	(2,145)
Removals	(1,655)
Transfer to other real estate owned	0
Transfers in	3,677
Transfers out	(789)
Ending balance	28,561
Non-performing
Financing Receivable, Modifications, Post Modification Recorded Investment [Roll Forward]
Beginning balance	23,619
Additions	18,903
Charge-offs	(1,046)
Principal payments, net	(8,695)
Removals	(6,384)
Transfer to other real estate owned	(112)
Transfers in	789
Transfers out	(3,677)
Ending balance	$ 23,397

Loans (Details 8)

Loans (Details 8) $ in Thousands	Sep. 30, 2016USD ($)
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Extended Maturity and Amortization and Reduction of Interest Rate	$ 3,704
Extended Maturity and/or Amortization	15,557
Delay in Payments or Reduction of Interest Rate	2,124
Total	21,385
Commercial
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Extended Maturity and Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	14,481
Delay in Payments or Reduction of Interest Rate	1,870
Total	16,351
Commercial loans collateralized by assignment of lease payments
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Extended Maturity and Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	0
Delay in Payments or Reduction of Interest Rate	0
Total	0
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
Extended Maturity and Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	0
Delay in Payments or Reduction of Interest Rate	0
Total	0
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
Extended Maturity and Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	0
Delay in Payments or Reduction of Interest Rate	0
Total	0
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
Extended Maturity and Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	0
Delay in Payments or Reduction of Interest Rate	0
Total	0
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
Extended Maturity and Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	0
Delay in Payments or Reduction of Interest Rate	0
Total	0
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
Extended Maturity and Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	0
Delay in Payments or Reduction of Interest Rate	0
Total	0
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
Extended Maturity and Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	0
Delay in Payments or Reduction of Interest Rate	0
Total	0
Residential real estate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Extended Maturity and Amortization and Reduction of Interest Rate	484
Extended Maturity and/or Amortization	256
Delay in Payments or Reduction of Interest Rate	0
Total	740
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
Extended Maturity and Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	0
Delay in Payments or Reduction of Interest Rate	0
Total	0
Indirect vehicle
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Extended Maturity and Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	0
Delay in Payments or Reduction of Interest Rate	183
Total	183
Home equity
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Extended Maturity and Amortization and Reduction of Interest Rate	3,220
Extended Maturity and/or Amortization	820
Delay in Payments or Reduction of Interest Rate	71
Total	4,111
Other consumer 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
Extended Maturity and Amortization and Reduction of Interest Rate	0
Extended Maturity and/or Amortization	0
Delay in Payments or Reduction of Interest Rate	0
Total	$ 0

Loans (Details 9)

Loans (Details 9) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Allowance for credit losses [Roll Forward]
Beginning balance				$ 128,140
Ending balance		$ 139,528		139,528
Ending allowance balance attributable to loans:
Acquired and accounted for under ASC 310-30	[1]	698	$ 1,830	698	$ 1,830
Unfunded Commitments
Allowance for unfunded credit commitments, beginning balance		2,719	4,060	3,368	4,031
Allowance for unfunded commitments, Provision		152	(648)	(497)	(619)
Individually evaluated for impairment for unfunded commitments		737	1,388	737	1,388
Unfunded commitments collectively evaluated for impairment		2,134	2,024	2,134	2,024
Allowance for unfunded credit commitments, ending balance		2,871	3,412	2,871	3,412
Allowance for credit losses
Allowance for credit losses, beginning balance		138,333	124,130	131,508	114,057
Allowance for loan losses and unfunded commitments charge offs		4,157	5,510	14,169	12,426
Allowance for loan losses and unfunded commitments recoveries		1,674	4,060	8,119	11,779
Allowance for loan losses and unfunded commitments provision		6,549	5,358	16,941	14,628
Allowance for credit losses, individually evaluated for impairment		16,080	20,392	16,080	20,392
Allowance for credit losses, collectively evaluated for impairment		125,621	105,816	125,621	105,816
Acquired and accounted for under ASC 310-30	[1]	698	1,830	698	1,830
Allowance for credit losses, ending balance		142,399	128,038	142,399	128,038
Loans:
Individually evaluated for impairment		74,537	116,287	74,537	116,287
Collectively evaluated for impairment		12,304,821	9,117,201	12,304,821	9,117,201
Acquired and accounted for under ASC 310-30	[1]	161,338	155,693	161,338	155,693
Total loans		12,540,696	9,389,181	12,540,696	9,389,181	$ 9,793,998
Commercial loans
Allowance for credit losses [Roll Forward]
Beginning balance		50,297	39,142	39,316	29,571
Charge-offs		1,341	1,657	2,126	2,283
Recoveries		665	456	1,997	1,514
Provision		(3,894)	5,044	6,540	14,183
Ending balance		45,727	42,985	45,727	42,985
Ending allowance balance attributable to loans:
Individually evaluated for impairment		5,401	7,943	5,401	7,943
Collectively evaluated for impairment		40,161	34,731	40,161	34,731
Acquired and accounted for under ASC 310-30	[1]	165	311	165	311
Allowance for credit losses
Acquired and accounted for under ASC 310-30	[1]	165	311	165	311
Loans:
Individually evaluated for impairment		19,284	36,325	19,284	36,325
Collectively evaluated for impairment		4,366,528	3,404,307	4,366,528	3,404,307
Acquired and accounted for under ASC 310-30	[1]	22,913	37,189	22,913	37,189
Total loans		4,408,725	3,477,821	4,408,725	3,477,821
Commercial loans collateralized by assignment of lease payments
Allowance for credit losses [Roll Forward]
Beginning balance		10,549	11,268	10,434	9,962
Charge-offs		367	1,980	3,288	2,080
Recoveries		3	11	520	1,100
Provision		2,944	985	5,463	1,302
Ending balance		13,129	10,284	13,129	10,284
Ending allowance balance attributable to loans:
Individually evaluated for impairment		3,933	2,618	3,933	2,618
Collectively evaluated for impairment		9,196	7,666	9,196	7,666
Loans:
Individually evaluated for impairment		8,054	6,724	8,054	6,724
Collectively evaluated for impairment		1,865,326	1,686,816	1,865,326	1,686,816
Total loans		1,873,380	1,693,540	1,873,380	1,693,540
Commercial real estate
Allowance for credit losses [Roll Forward]
Beginning balance		46,040	38,076	45,475	41,826
Charge-offs		529	170	2,601	2,312
Recoveries		324	2,402	2,761	6,338
Provision		1,239	1,216	1,439	(4,328)
Ending balance		47,074	41,524	47,074	41,524
Ending allowance balance attributable to loans:
Individually evaluated for impairment		363	3,123	363	3,123
Collectively evaluated for impairment		46,235	36,975	46,235	36,975
Acquired and accounted for under ASC 310-30	[1]	476	1,426	476	1,426
Allowance for credit losses
Acquired and accounted for under ASC 310-30	[1]	476	1,426	476	1,426
Loans:
Individually evaluated for impairment		6,530	29,354	6,530	29,354
Collectively evaluated for impairment		3,788,271	2,550,655	3,788,271	2,550,655
Acquired and accounted for under ASC 310-30	[1]	41,286	47,803	41,286	47,803
Total loans		3,836,087	2,627,812	3,836,087	2,627,812
Residential real estate
Allowance for credit losses [Roll Forward]
Beginning balance		4,800	6,669	5,734	6,646
Charge-offs		290	292	1,134	1,189
Recoveries		45	337	151	417
Provision		1,575	(868)	1,379	(28)
Ending balance		6,130	5,846	6,130	5,846
Ending allowance balance attributable to loans:
Individually evaluated for impairment		2,394	2,834	2,394	2,834
Collectively evaluated for impairment		3,736	3,012	3,736	3,012
Loans:
Individually evaluated for impairment		13,268	14,233	13,268	14,233
Collectively evaluated for impairment		985,559	592,938	985,559	592,938
Acquired and accounted for under ASC 310-30	[1]	66,698	43,735	66,698	43,735
Total loans		1,065,525	650,906	1,065,525	650,906
Construction real estate
Allowance for credit losses [Roll Forward]
Beginning balance		14,230	12,459	15,113	8,918
Charge-offs		7	5	151	11
Recoveries		50	216	94	253
Provision		2,033	123	1,250	3,633
Ending balance		16,306	12,793	16,306	12,793
Ending allowance balance attributable to loans:
Collectively evaluated for impairment		16,249	12,700	16,249	12,700
Acquired and accounted for under ASC 310-30	[1]	57	93	57	93
Allowance for credit losses
Acquired and accounted for under ASC 310-30	[1]	57	93	57	93
Loans:
Collectively evaluated for impairment		451,023	255,620	451,023	255,620
Acquired and accounted for under ASC 310-30	[1]	14,131	12,372	14,131	12,372
Total loans		465,154	267,992	465,154	267,992
Indirect vehicle
Allowance for credit losses [Roll Forward]
Beginning balance		3,100	1,909	2,418	1,687
Charge-offs		838	581	2,420	2,082
Recoveries		436	334	1,400	1,354
Provision		598	512	1,898	1,215
Ending balance		3,296	2,174	3,296	2,174
Ending allowance balance attributable to loans:
Individually evaluated for impairment			8		8
Collectively evaluated for impairment		3,296	2,166	3,296	2,166
Loans:
Individually evaluated for impairment		125	131	125	131
Collectively evaluated for impairment		522,146	345,600	522,146	345,600
Total loans		522,271	345,731	522,271	345,731
Home equity
Allowance for credit losses [Roll Forward]
Beginning balance		4,199	8,412	7,374	9,456
Charge-offs		376	358	1,233	1,078
Recoveries		65	186	576	447
Provision		2,309	(1,490)	(520)	(2,075)
Ending balance		6,197	6,750	6,197	6,750
Ending allowance balance attributable to loans:
Individually evaluated for impairment		3,252	2,478	3,252	2,478
Collectively evaluated for impairment		2,945	4,272	2,945	4,272
Loans:
Individually evaluated for impairment		27,276	29,520	27,276	29,520
Collectively evaluated for impairment		248,012	193,653	248,012	193,653
Acquired and accounted for under ASC 310-30	[1]	13,886	11,986	13,886	11,986
Total loans		289,174	235,159	289,174	235,159
Other consumer
Allowance for credit losses [Roll Forward]
Beginning balance		2,399	2,135	2,276	1,960
Charge-offs		409	467	1,216	1,391
Recoveries		86	118	620	356
Provision		(407)	484	(11)	1,345
Ending balance		1,669	2,270	1,669	2,270
Ending allowance balance attributable to loans:
Collectively evaluated for impairment		1,669	2,270	1,669	2,270
Loans:
Individually evaluated for impairment		0		0
Collectively evaluated for impairment		77,956	87,612	77,956	87,612
Acquired and accounted for under ASC 310-30	[1]	2,424	2,608	2,424	2,608
Total loans		$ 80,380	$ 90,220	80,380	$ 90,220
Purchased loans
Allowance for credit losses [Roll Forward]
Provision				$ (515)
[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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Purchased loans
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Provision			$ (515)
Allowance for loan losses and unfunded commitments write offs net of recoveries			864
Commercial real estate
Activity in the allowance for loan losses, balance in allowance for loan losses and recorded investment in loans by portfolio segment and based on impairment method
Provision	$ 1,239	$ 1,216	1,439	$ (4,328)
Allowance for loan losses and unfunded commitments acquired with deteriorated credit quality	$ 698		$ 698		$ 2,100

Loans (Details 11)

Loans (Details 11) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Changes in the accretable yield for purchased credit-impaired loans
Balance at beginning of period		$ 13,160	$ 11,456	$ 12,596	$ 7,434
Purchases		805	0	805	0
Accretion		(2,564)	(1,794)	(7,193)	(5,541)
Other	[1]	2,523	590	7,716	8,359
Balance at end of period		$ 13,924	$ 10,252	$ 13,924	$ 10,252
[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	Sep. 30, 2016USD ($)
Loans
Non covered loans	$ 3,041,830
Total acquired	3,060,449
Purchased Credit-Impaired Loans
Loans
Non covered loans	142,719
Total acquired	161,338
Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	2,899,111
Total acquired	2,899,111
Commercial loans, commercial real estate receivable and construction loans | Heritage
Loans
Loans not covered under the loss share agreement	1,900
Commercial loans, commercial real estate receivable and construction loans | Benchmark
Loans
Loans not covered under the loss share agreement	1,700
Commercial loans, commercial real estate receivable and construction loans | Broadway and New Century
Loans
Loans not covered under the loss share agreement	8,200
Commercial loans
Loans
Non covered loans	994,978
Commercial loans | Purchased Credit-Impaired Loans
Loans
Non covered loans	22,913
Commercial loans | Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	972,065
Commercial loans collateralized by assignment of lease payments
Loans
Non covered loans	72,193
Commercial loans collateralized by assignment of lease payments | Purchased Credit-Impaired Loans
Loans
Non covered loans	0
Commercial loans collateralized by assignment of lease payments | Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	72,193
Commercial real estate
Loans
Non covered loans	1,453,963
Commercial real estate | Purchased Credit-Impaired Loans
Loans
Non covered loans	41,286
Commercial real estate | Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	1,412,677
Construction real estate
Loans
Non covered loans	52,699
Construction real estate | Purchased Credit-Impaired Loans
Loans
Non covered loans	14,131
Construction real estate | Purchased Non-Credit-Impaired Loans
Loans
Non covered loans	38,568
Consumer related
Loans
Covered loans	18,619
Non covered loans	467,997
Consumer related | Purchased Credit-Impaired Loans
Loans
Covered loans	18,619
Non covered loans	64,389
Consumer related | Purchased Credit-Impaired Loans | Ginnie Mae
Loans
Consumer related purchased credit-impaired loans	60,600
Consumer related | Purchased Non-Credit-Impaired Loans
Loans
Covered loans	0
Non covered loans	$ 403,608

Goodwill and Intangibles (Detai

Goodwill and Intangibles (Details)	9 Months Ended
	Sep. 30, 2016USD ($)segment	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Number of operating segments | segment	3
Impairment loss	$ 0	$ 0
Goodwill	$ 993,799,000		$ 725,070,000
Weighted average amortization period (in years)	13 years

Goodwill and Intangibles (Det63

Goodwill and Intangibles (Details 2) $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 725,070
Goodwill from business combinations	268,729	[1]
Balance at end of period	993,799
Banking
Goodwill [Roll Forward]
Balance at beginning of period	684,430
Goodwill from business combinations	268,729	[1]
Balance at end of period	953,159
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 American Chartered merger and adjustments recognized for the MSA acquisition.

Goodwill and Intangibles (Det64

Goodwill and Intangibles (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Changes in the carrying amount of core deposit and client relationship intangibles
Balance at beginning of period			$ 44,812
Amortization expense	$ (1,674)	$ (1,542)	(4,917)	$ (4,569)
Other intangibles from acquisition			25,500
Balance at end of period	$ 65,395		$ 65,395

Goodwill and Intangibles (Det65

Goodwill and Intangibles (Details 4) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Gross carrying amount	$ 118,792
Accumulated amortization	(53,397)
Net book value	$ 65,395	$ 44,812

Goodwill and Intangibles (Det66

Goodwill and Intangibles (Details 5) $ in Thousands	Sep. 30, 2016USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,016	$ 2,390
2,017	8,198
2,018	7,456
2,019	5,677
2,020	5,026
Thereafter	36,648
Total estimated future amortization expense	$ 65,395

Deposits (Details)

Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Banking and Thrift [Abstract]
Demand deposit accounts, noninterest bearing	$ 6,410,334	$ 4,627,184
NOW, money market and interest bearing deposits	4,660,407	4,144,633
Savings accounts	1,147,900	974,555
Certificates of deposit, $250,000 or more	1,121,599	877,352
Other certificates of deposit	939,026	881,491
Total deposits	14,279,266	11,505,215
Brokered deposits	$ 759,300	$ 500,200

Short-Term Borrowings (Details)

Short-Term Borrowings (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Short-term borrowings
Weighted Average Interest Rate	0.36%	0.23%
Amount	$ 1,496,319,000	$ 1,005,737,000
Customer repurchase agreements
Short-term borrowings
Weighted Average Interest Rate	0.21%	0.20%
Amount	$ 256,569,000	$ 201,207,000
Federal Home Loan Bank advances
Short-term borrowings
Weighted Average Interest Rate	0.38%	0.17%
Amount	$ 1,200,000,000	$ 775,000,000
Federal funds purchased
Short-term borrowings
Weighted Average Interest Rate	0.60%	0.09%
Amount	$ 39,750,000	$ 4,530,000
Line of credit
Short-term borrowings
Weighted Average Interest Rate	0.00%	2.18%
Amount	$ 0	$ 25,000,000

Short-Term Borrowings (Details

Short-Term Borrowings (Details 2) - USD ($)	Dec. 18, 2015	Sep. 30, 2016	Dec. 31, 2015
Short-term borrowings
Fixed interest rate Federal Home Loan Bank advances		$ 1,200,000,000	$ 775,000,000
Short-term borrowings		1,496,319,000	1,005,737,000
Federal Home Loan Bank advances
Short-term borrowings
Short-term borrowings		1,200,000,000	775,000,000
Line of credit
Short-term borrowings
Line of credit facility, maximum borrowing capacity	$ 35,000,000
Description of annual interest rate basis	one month LIBOR
Short-term borrowings		$ 0	$ 25,000,000
Line of credit | LIBOR
Short-term borrowings
Basis spread on variable rate	1.75%
Minimum | Federal Home Loan Bank advances
Short-term borrowings
Effective interest rate of amounts due within one year		0.24%
Maximum | Federal Home Loan Bank advances
Short-term borrowings
Effective interest rate of amounts due within one year		0.40%

Long-Term Borrowings (Details)

Long-Term Borrowings (Details) - USD ($) $ in Thousands	Aug. 24, 2016	Dec. 31, 2015	Sep. 30, 2016
Long-term borrowings
Federal Home Loan Bank advances		$ 305,200	$ 230,100
Long-term borrowings		400,274	311,645
London Interbank Offered Rate (LIBOR)
Long-term borrowings
Basis spread on variable rate	1.75%
Notes payable to banks
Long-term borrowings
Long-term borrowings		55,000	$ 66,500
Weighted average interest rate			4.22%
Equipment pledged as collateral		65,800	$ 79,000
Unsecured term
Long-term borrowings
Long-term borrowings	$ 16,000		$ 15,000
Quarterly principal payments	$ 1,000
Structured repurchase agreement
Long-term borrowings
Long-term borrowings		$ 40,000
Term of structured repurchase agreement		10 years
Fixed interest rate (as a percent)		4.75%
Minimum | Federal Home Loan Bank advances
Long-term borrowings
Interest rate			0.30%
Minimum | Notes payable to banks
Long-term borrowings
Interest rate			2.46%
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 Iss71

Junior Subordinated Notes Issued to Capital Trusts (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2016	Dec. 31, 2015
Junior Subordinated Notes
Principal balance		$ 209,159	$ 186,164
Junior Subordinated Notes | Maximum
Investment Owned, Balance [Abstract]
Period for deferment of payment of interest on notes (in years)		5 years
Coal City Capital Trust I | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.80%
Description of annual interest rate basis		3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value		$ 25,000
Coal City Capital Trust I | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance		$ 25,774
Basis spread on variable rate		1.80%
Description of annual interest rate basis		3-mo LIBOR
MB Financial Capital Trust II | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.40%
Description of annual interest rate basis		3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value		$ 35,000
MB Financial Capital Trust II | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance		$ 36,083
Basis spread on variable rate		1.40%
Description of annual interest rate basis		3-mo LIBOR
MB Financial Capital Trust III | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.50%
Description of annual interest rate basis		3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value		$ 10,000
MB Financial Capital Trust III | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance		$ 10,310
Basis spread on variable rate		1.50%
Description of annual interest rate basis		3-mo LIBOR
MB Financial Capital Trust IV | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.52%
Description of annual interest rate basis		3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value		$ 20,000
MB Financial Capital Trust IV | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance		$ 20,619
Basis spread on variable rate		1.52%
Description of annual interest rate basis		3-mo LIBOR
MB Financial Capital Trust V | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.30%
Description of annual interest rate basis		3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value		$ 30,000
MB Financial Capital Trust V | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance		$ 30,928
Basis spread on variable rate		1.30%
Description of annual interest rate basis		3-mo LIBOR
MB Financial Capital Trust VI | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate		1.30%
Description of annual interest rate basis		3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value		$ 22,500
MB Financial Capital Trust VI | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance		$ 23,196
Basis spread on variable rate		1.30%
Description of annual interest rate basis		3-mo LIBOR
FOBB Statutory Trust III | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate	[1]	2.80%
Description of annual interest rate basis	[1]	3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value	[1]	$ 5,000
FOBB Statutory Trust III | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance	[1]	$ 5,155
Basis spread on variable rate	[1]	2.80%
Description of annual interest rate basis	[1]	3-mo LIBOR
TAYC Capital Trust II
Investment Owned, Balance [Abstract]
Purchase accounting adjustments discount		$ 6,800
TAYC Capital Trust II | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate	[2]	2.68%
Description of annual interest rate basis	[2]	3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value	[2]	$ 40,000
TAYC Capital Trust II | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance	[2]	$ 41,238
Basis spread on variable rate	[2]	2.68%
Description of annual interest rate basis	[2]	3-mo LIBOR
American Chartered Statutory Trust I | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate	[3]	3.60%
Description of annual interest rate basis	[3]	3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value	[3]	$ 20,000
American Chartered Statutory Trust I | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance	[3]	$ 20,619
Basis spread on variable rate	[3]	3.60%
Description of annual interest rate basis	[3]	3-mo LIBOR
American Chartered Statutory Trust II | Trust Preferred Securities
Junior Subordinated Notes
Basis spread on variable rate	[3]	2.75%
Description of annual interest rate basis	[3]	3-mo LIBOR
Investment Owned, Balance [Abstract]
Face Value	[3]	$ 10,000
American Chartered Statutory Trust II | Junior Subordinated Notes
Junior Subordinated Notes
Principal balance	[3]	$ 10,464
Basis spread on variable rate	[3]	2.75%
Description of annual interest rate basis	[3]	3-mo LIBOR
American Chartered Statutory Trust I and II
Investment Owned, Balance [Abstract]
Purchase accounting adjustments discount		$ 8,000
[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 $6.8 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 $8.0 million.

Commitments and Contingencies72

Commitments and Contingencies (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Commitments [Abstract]
Maximum maturity period for letters of credit (in years)	5 years
Increase in maximum potential amount of future payments under letters of credit	$ 38,900
Dollar amount of letters of credit outstanding	177,900	$ 139,100
Letters of credit issued or renewed	121,000
Capital expenditure commitments outstanding	7,100
Home equity lines
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	243,331	187,478
Other commitments
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	3,596,246	3,049,152
Standby
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	172,737	137,945
Commercial
Long-term Purchase Commitment [Line Items]
Dollar amount of line of credit outstanding	$ 5,211	$ 1,108

Commitments and Contingencies73

Commitments and Contingencies (Details 2)	9 Months Ended
	Sep. 30, 2016
States and political subdivisions | State of Illinois
Concentrations of credit risk
Percentage of investments issued by states and political subdivisions that were within the state of Illinois	21.00%

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		$ 1,859,356	$ 1,585,023
Loans held for sale		899,412	744,727
Loans		12,379,358	9,652,592
Mortgage servicing rights		154,730	168,162
Derivative financial instruments		49,510	10,062
Derivative financial instruments		68,515	34,338
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		53,968	64,611
States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		410,737	396,367
Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		1,076,337	763,549
Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		96,993	130,107
Corporate bonds
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		210,193	219,628
Equity securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		11,128	10,761
Recurring basis
Financial assets and financial liabilities measured at fair value on a recurring basis
Loans held for sale		899,412	744,727
Loans		19,121	25,869
Assets held in trust for deferred compensation		18,937	16,820
Other liabilities	[1]	18,937	16,333
Derivative financial instruments		70,330	36,974
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		53,968	64,611
Recurring basis | States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		410,737	396,367
Recurring basis | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		1,076,337	763,549
Recurring basis | Commercial mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		96,993	130,107
Recurring basis | Corporate bonds
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		210,193	219,628
Recurring basis | Equity securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		11,128	10,761
Recurring basis | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Mortgage servicing rights		154,730	168,162
Recurring basis | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative financial instruments		112,208	42,846
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		11,128	10,761
Loans held for sale		0	0
Assets held in trust for deferred compensation		18,937	16,820
Derivative financial instruments		1,347	5,118
Other liabilities	[1]	18,937	16,333
Derivative financial instruments		6,001	6,050
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		11,128	10,761
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		1,347	5,118
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		1,847,606	1,573,489
Loans held for sale		899,412	744,727
Loans		19,121	25,869
Derivative financial instruments		98,300	33,906
Derivative financial instruments		64,329	30,924
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		53,968	64,611
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		410,320	395,950
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		1,076,132	763,193
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		96,993	130,107
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		210,193	219,628
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		98,300	33,906
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		622	773
Loans held for sale		0	0
Derivative financial instruments		12,561	3,822
Derivative financial instruments		0	0
Recurring basis | Significant Unobservable Inputs (Level 3) | States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale		417	417
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		205	356
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		154,730	168,162
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		$ 12,561	$ 3,822
[1]	Liabilities associated with assets held in trust for deferred compensation

Fair Value Measurements (Deta75

Fair Value Measurements (Details 2) - USD ($)	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale	$ 1,859,356,000	$ 1,585,023,000
Mortgage servicing rights	154,730,000	168,162,000
Derivative financial instruments	49,510,000	10,062,000
States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale	410,737,000	396,367,000
Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale	1,076,337,000	763,549,000
Recurring basis | States and political subdivisions
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale	410,737,000	396,367,000
Recurring basis | Residential mortgage-backed securities
Financial assets and financial liabilities measured at fair value on a recurring basis
Investment securities available for sale	1,076,337,000	763,549,000
Recurring basis | Mortgage servicing rights
Financial assets and financial liabilities measured at fair value on a recurring basis
Mortgage servicing rights	154,730,000	168,162,000
Recurring basis | Derivative financial instruments
Financial assets and financial liabilities measured at fair value on a recurring basis
Derivative financial instruments	112,208,000	42,846,000
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	622,000	773,000
Derivative financial instruments	12,561,000	3,822,000
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	$ 417,000	417,000
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	$ 205,000	356,000
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	154,730,000	168,162,000
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	$ 12,561,000	$ 3,822,000
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)	12.30%
Discount rate	9.50%
Maturity (months)	327 months
Delinquencies	0.51%
Costs to service	$ 66
Costs to service - delinquent	$ 150
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	0.9858%
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)	16.10%
Discount rate	12.00%
Maturity (months)	357 months
Delinquencies	3.86%
Costs to service	$ 160
Costs to service - delinquent	$ 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	1.0977%

Fair Value Measurements (Deta76

Fair Value Measurements (Details 3) - Mortgage servicing rights	9 Months Ended
	Sep. 30, 2016USD ($)
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Impact on fair value of 10% adverse change, CPR	$ (7,917,000)
Impact on fair value of 20% adverse change, CPR	(15,144,000)
Impact on fair value of 10% adverse change, discount rate	(5,045,000)
Impact on fair value of 20% adverse change, discount rate	(9,769,000)
Impact on fair value of 10% adverse change, delinquency rate	(1,329,000)
Impact on fair value of 20% adverse change, delinquency rate	(2,428,000)
Impact on fair value of 10% adverse change, costs to service	(2,988,000)
Impact on fair value of 20% adverse change, costs to service	$ (5,976,000)
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	15.30%
Weighted average discount rate	9.78%
Weighted average delinquency rate	1.80%
Weighted average costs to service	$ 88

Fair Value Measurements (Deta77

Fair Value Measurements (Details 4) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
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	$ 773	$ 973
Purchases	0	0
Originations	0	0
Included in earnings	0	0
Principal payments	(151)	(115)
Sales	0	0
Balance, ending of period	622	858
Mortgage Servicing Rights
Financial assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance, beginning of period	168,162	235,402
Purchases	3,423	785
Originations	43,039	55,583
Included in earnings	(59,894)	(40,568)
Principal payments	0	0
Sales	0	(103,105)
Balance, ending of period	154,730	148,097
Derivatives
Financial assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance, beginning of period	3,822	5,074
Purchases	0	0
Originations	0	0
Included in earnings	8,739	3,088
Principal payments	0	0
Sales	0	0
Balance, ending of period	$ 12,561	$ 8,162

Fair Value Measurements (Deta78

Fair Value Measurements (Details 5) - Nonrecurring basis - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financial Assets:
Impaired loans	$ 54,740	$ 76,203
Foreclosed assets	38,735	42,351
Significant Unobservable Inputs (Level 3)
Financial Assets:
Impaired loans	54,740	76,203
Foreclosed assets	$ 38,735	$ 42,351
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 (Deta79

Fair Value Measurements (Details 6) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
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	$ 351,009	$ 307,869
Interest earning deposits with banks	125,250	73,572
Investment securities available for sale	1,859,356	1,585,023
Investment securities held to maturity	1,175,838	1,274,767
Non-marketable securities - FHLB and FRB stock	146,209	114,233
Loans held for sale	899,412	744,727
Derivative financial instruments	49,510	10,062
Financial Liabilities:
Non-interest bearing deposits	6,410,334	4,627,184
Interest bearing deposits	7,868,932	6,878,031
Short-term borrowings	1,496,319	1,005,737
Junior subordinated notes issued to capital trusts	209,159	186,164
Derivative financial instruments	68,515	34,338
Carrying Amount
Financial Assets:
Cash and due from banks	351,009	307,869
Interest earning deposits with banks	125,250	73,572
Investment securities available for sale	1,859,356	1,585,023
Investment securities held to maturity	1,115,262	1,230,810
Non-marketable securities - FHLB and FRB stock	146,209	114,233
Loans held for sale	899,412	744,727
Loans, net	12,401,168	9,665,858
Accrued interest receivable	58,541	53,457
Derivative financial instruments	112,208	42,846
Financial Liabilities:
Non-interest bearing deposits	6,410,334	4,627,184
Interest bearing deposits	7,868,932	6,878,031
Short-term borrowings	1,496,319	1,005,737
Long-term borrowings	311,645	400,274
Junior subordinated notes issued to capital trusts	209,159	186,164
Accrued interest payable	4,000	3,186
Derivative financial instruments	70,330	36,974
Estimated Fair Value
Financial Assets:
Cash and due from banks	351,009	307,869
Interest earning deposits with banks	125,250	73,572
Investment securities available for sale	1,859,356	1,585,023
Investment securities held to maturity	1,175,838	1,274,767
Non-marketable securities - FHLB and FRB stock	146,209	114,233
Loans held for sale	899,412	744,727
Loans, net	12,403,330	9,626,344
Accrued interest receivable	58,541	53,457
Derivative financial instruments	112,208	42,846
Financial Liabilities:
Non-interest bearing deposits	6,410,334	4,627,184
Interest bearing deposits	7,873,233	6,875,411
Short-term borrowings	1,496,312	1,005,705
Long-term borrowings	312,974	401,539
Junior subordinated notes issued to capital trusts	144,681	122,696
Accrued interest payable	4,000	3,186
Derivative financial instruments	70,330	36,974
Recurring basis
Financial Assets:
Loans held for sale	899,412	744,727
Financial Liabilities:
Derivative financial instruments	70,330	36,974
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets:
Cash and due from banks	351,009	307,869
Interest earning deposits with banks	125,250	73,572
Investment securities available for sale	11,128	10,761
Investment securities held to maturity	0	0
Non-marketable securities - FHLB and FRB stock	0	0
Loans held for sale	0	0
Loans, net	0	0
Accrued interest receivable	58,541	53,457
Derivative financial instruments	1,347	5,118
Financial Liabilities:
Non-interest bearing deposits	6,410,334	4,627,184
Interest bearing deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Junior subordinated notes issued to capital trusts	0	0
Accrued interest payable	4,000	3,186
Derivative financial instruments	6,001	6,050
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	1,847,606	1,573,489
Investment securities held to maturity	1,175,838	1,274,767
Non-marketable securities - FHLB and FRB stock	0	0
Loans held for sale	899,412	744,727
Loans, net	19,121	25,869
Accrued interest receivable	0	0
Derivative financial instruments	98,300	33,906
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	64,329	30,924
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	622	773
Investment securities held to maturity	0	0
Non-marketable securities - FHLB and FRB stock	146,209	114,233
Loans held for sale	0	0
Loans, net	12,384,209	9,600,475
Accrued interest receivable	0	0
Derivative financial instruments	12,561	3,822
Financial Liabilities:
Non-interest bearing deposits	0	0
Interest bearing deposits	7,873,233	6,875,411
Short-term borrowings	1,496,312	1,005,705
Long-term borrowings	312,974	401,539
Junior subordinated notes issued to capital trusts	144,681	122,696
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		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Impact of the share-based payment plans in the financial statements
Total cost of share-based payment plans during the period	$ 4,238	$ 3,508	$ 12,573	$ 10,983
Amount of related income tax benefit recognized in income	$ 3,394	$ 1,367	$ 6,649	$ 4,288
Employee stock options
Number of Options
Outstanding, beginning balance (in shares)			2,192,431
Granted (in shares)			501,538
Exercised (in shares)			(461,405)
Expired (in shares)			(35,791)
Forfeited or cancelled (in shares)			(33,680)
Outstanding, ending balance (in shares)	2,163,093		2,163,093		2,192,431
Options exercisable (in shares)	1,423,442		1,423,442
Weighted Average Exercise Price
Outstanding, beginning balance (in dollars per share)			$ 27.77
Granted (in dollars per share)			28.86
Exercised (in dollars per share)			28.98
Expired (in dollars per share)			39.91
Forfeited or cancelled (in dollars per share)			31.06
Outstanding, ending balance (in dollars per share)	$ 27.51		27.51		$ 27.77
Options exercisable (in dollars per share)	$ 26.82		$ 26.82
Weighted Average Remaining Contractual Term (In Years)
Outstanding, beginning balance (in years)			5 years 3 months 5 days		4 years 5 months 10 days
Outstanding, ending balance (in years)			5 years 3 months 5 days		4 years 5 months 10 days
Options exercisable (in years)			3 years 6 months 10 days
Aggregate Intrinsic Value (in thousands)
Options outstanding	$ 22,903		$ 22,903
Options exercisable	$ 16,109		$ 16,109
Fair value assumptions
Risk-free interest rate			1.44%
Expected volatility of Company’s stock			28.17%
Expected dividend yield			2.21%
Expected life of options			5 years 6 months 20 days
Weighted average fair value per option of options granted during the year (in dollars per share)			$ 6.64
Restricted shares
Number of Shares and Units
Shares and units outstanding, beginning balance (in shares)			945,506
Granted (in shares)			482,739
Vested (in shares)			(405,633)
Forfeited or cancelled (in shares)			(23,824)
Shares and units outstanding, ending balance (in shares)	998,788		998,788		945,506
Weighted Average Grant Date Fair Value
Shares Outstanding, Beginning balance (in dollars per share)			$ 29.92
Granted (in dollars per share)			31.19
Vested (in dollars per share)			28.37
Forfeited or cancelled (in dollars per share)			29.95
Shares Outstanding, Ending balance (in dollars per share)	$ 31.17		$ 31.17		$ 29.92

Stock Incentive Plans (Details

Stock Incentive Plans (Details 2) - USD ($) $ in Millions	Aug. 18, 2014	May 28, 2014	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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)			3,826,110
Unrecognized compensation cost related to nonvested share-based compensation			$ 25.4
Period for recognition			2 years 5 months
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
Employee stock options
Stock-based compensation
Award requisite service period			4 years
Expiration term of options			10 years
Intrinsic value of options exercised			$ 3.6	$ 1.3
Employee 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			$ 15.7	$ 11.3
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)			80,780		71,560	48,569	56,752
Percentage of shares earned to number of units issued			175.00%
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 Instrume82

Derivative Financial Instruments (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Derivative [Line Items]
Net amount payable under interest rate swap				$ 1		$ 1
Interest rate swap credit risk exposure		$ 45,800		45,800
Asset Derivatives, Notional Amount		4,234,276		4,234,276		3,389,146
Asset Derivatives, Estimated Fair Value		112,208		112,208		42,846
Liability Derivatives, Notional Amount		2,936,937		2,936,937		2,419,933
Liability Derivatives, Estimated Fair Value		(70,330)		(70,330)		(36,974)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		(1,487)	$ (749)	38,284	$ (508)
Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	4,234,276		4,234,276		3,389,146
Asset Derivatives, Estimated Fair Value	[1]	112,208		112,208		42,846
Liability Derivatives, Notional Amount	[1]	2,936,818		2,936,818		2,419,779
Liability Derivatives, Estimated Fair Value	[1]	(70,325)		(70,325)		(36,965)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		(1,490)	(753)	38,281	(512)
Commercial loan interest rate swaps
Derivative [Line Items]
Liability Derivatives, Notional Amount		119		119
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]	119		119		154
Liability Derivatives, Estimated Fair Value	[2]	(5)		(5)		(9)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		3	4	3	4
Interest rate swap contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	1,226,157		1,226,157		1,034,298
Asset Derivatives, Estimated Fair Value	[1]	49,520		49,520		27,856
Liability Derivatives, Notional Amount	[1]	1,226,157		1,226,157		1,025,186
Liability Derivatives, Estimated Fair Value	[1]	(49,520)		(49,520)		(27,899)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		5,296	8,614	5,260	8,623
Interest rate swap contracts | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	1,332,000		1,332,000		898,000
Asset Derivatives, Estimated Fair Value	[1]	44,660		44,660		4,928
Liability Derivatives, Notional Amount	[1]	185,000		185,000		665,000
Liability Derivatives, Estimated Fair Value	[1]	(10,915)		(10,915)		(3,723)
Interest rate swaptions contracts | 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]	0		0		0
Liability Derivatives, Estimated Fair Value	[1]	0		0		0
Interest rate options contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	219,409		219,409		222,585
Asset Derivatives, Estimated Fair Value	[1]	872		872		628
Liability Derivatives, Notional Amount	[1]	219,409		219,409		190,622
Liability Derivatives, Estimated Fair Value	[1]	(872)		(872)		(585)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		(36)	0	0	0
Foreign exchange contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	49,550		49,550		72,529
Asset Derivatives, Estimated Fair Value	[1]	3,231		3,231		3,970
Liability Derivatives, Notional Amount	[1]	44,474		44,474		63,339
Liability Derivatives, Estimated Fair Value	[1]	(3,011)		(3,011)		(3,671)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		1,362	30	1,362	91
Spot foreign exchange contracts | Stand-alone derivative instruments
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	742		742		328
Asset Derivatives, Estimated Fair Value	[1]	17		17		5
Liability Derivatives, Notional Amount	[1]	278		278		132
Liability Derivatives, Estimated Fair Value	[1]	(6)		(6)		0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Amounts of gain or (loss) recognized in income on derivatives		6	14	6	182
Treasury futures contracts | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	86,500		86,500		0
Asset Derivatives, Estimated Fair Value	[1]	406		406		0
Liability Derivatives, Notional Amount	[1]	0		0		0
Liability Derivatives, Estimated Fair Value	[1]	0		0		0
TBA mortgage securities | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	290,000		290,000		35,000
Asset Derivatives, Estimated Fair Value	[1]	856		856		33
Liability Derivatives, Notional Amount	[1]	0		0		0
Liability Derivatives, Estimated Fair Value	[1]	0		0		0
Forward loan sale commitments | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	85,000		85,000		503,500
Asset Derivatives, Estimated Fair Value	[1]	85		85		1,604
Liability Derivatives, Notional Amount	[1]	1,261,500		1,261,500		475,500
Liability Derivatives, Estimated Fair Value	[1]	(6,001)		(6,001)		(1,087)
Interest rate lock commitments | Stand-alone derivative instruments | Mortgage Banking
Derivative [Line Items]
Asset Derivatives, Notional Amount	[1]	944,918		944,918		622,906
Asset Derivatives, Estimated Fair Value	[1]	12,561		12,561		3,822
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		$ (8,118)	$ (9,411)	$ 31,653	$ (9,408)
[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 Instrume83

Derivative Financial Instruments (Details 2) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	$ 49,510	$ 10,062
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	49,510	10,062
Financial Liabilities, Gross Amount Recognized	68,515	34,338
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	68,515	34,338
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	256,569	201,207
Repurchase Agreements, Financial Liabilities, Gross Amount Offset	0	0
Repurchase Agreements, Financial Liabilities, Net Amount Recognized	256,569	201,207
Total Financial Assets, Gross Amount Recognized	49,510	10,062
Total Financial Assets, Gross Amount Offset	0	0
Total Financial Assets, Net Amount Recognized	49,510	10,062
Total Financial Liabilities, Gross Amount Recognized	325,084	235,545
Total Financial Liabilities, Gross Amount Offset	0	0
Total Financial Liabilities, Net Amount Recognized	325,084	235,545
Interest rate swap contracts, caps and floors
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	652	5,698
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	652	5,698
Financial Liabilities, Gross Amount Recognized	50,047	31,446
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	50,047	31,446
Foreign exchange contracts
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	2,850	2,728
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	2,850	2,728
Financial Liabilities, Gross Amount Recognized	1,551	1,805
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	1,551	1,805
Mortgage related derivatives
Derivative [Line Items]
Financial Assets, Gross Amount Recognized	46,008	1,636
Financial Assets, Gross Amount Offset	0	0
Financial Assets, Net Amount Recognized	46,008	1,636
Financial Liabilities, Gross Amount Recognized	16,917	1,087
Financial Liabilities, Gross Amount Offset	0	0
Financial Liabilities, Net Amount Recognized	$ 16,917	$ 1,087

Derivative Financial Instrume84

Derivative Financial Instruments (Details 3) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Financial Assets, Net Amount Recognized	$ 49,510	$ 10,062
Financial Assets, Financial Instruments	(30,213)	(9,523)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	19,297	539
Financial Liabilities, Net Amount Recognized	68,515	34,338
Financial Liabilities, Financial Instruments	(30,213)	(9,523)
Financial Liabilities, Collateral	(38,279)	(24,649)
Financial Liabilities, Net Amount	23	166
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	256,569	201,207
Repurchase Agreements, Financial Liabilities, Financial Instruments	0	0
Repurchase Agreements, Financial Liabilities, Collateral	(256,569)	(201,207)
Repurchase Agreements, Financial Liabilities, Net Amount	0	0
Total Financial Assets, Net Amount Recognized	49,510	10,062
Total Financial Assets, Financial Instruments	(30,213)	(9,523)
Total Financial Assets, Collateral	0	0
Total Financial Assets, Net Amount	19,297	539
Total Financial Liabilities, Net Amount Recognized	325,084	235,545
Total Financial Liabilities, Financial Instruments	(30,213)	(9,523)
Total Financial Liabilities, Collateral	(294,848)	(225,856)
Total Financial Liabilities, Net Amount	23	166
Counterparty A
Derivative [Line Items]
Financial Assets, Net Amount Recognized	35,142	3,810
Financial Assets, Financial Instruments	(15,868)	(3,810)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	19,274	0
Financial Liabilities, Net Amount Recognized	15,868	11,137
Financial Liabilities, Financial Instruments	(15,868)	(3,810)
Financial Liabilities, Collateral	0	(7,327)
Financial Liabilities, Net Amount	0	0
Counterparty B
Derivative [Line Items]
Financial Assets, Net Amount Recognized	309	6
Financial Assets, Financial Instruments	(309)	(6)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	0	0
Financial Liabilities, Net Amount Recognized	11,098	7,808
Financial Liabilities, Financial Instruments	(309)	(6)
Financial Liabilities, Collateral	(10,789)	(7,802)
Financial Liabilities, Net Amount	0	0
Counterparty C
Derivative [Line Items]
Financial Assets, Net Amount Recognized	7,740	3,477
Financial Assets, Financial Instruments	(7,740)	(3,477)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	0	0
Financial Liabilities, Net Amount Recognized	17,344	4,963
Financial Liabilities, Financial Instruments	(7,740)	(3,477)
Financial Liabilities, Collateral	(9,604)	(1,486)
Financial Liabilities, Net Amount	0	0
Other counterparties
Derivative [Line Items]
Financial Assets, Net Amount Recognized	6,319	2,769
Financial Assets, Financial Instruments	(6,296)	(2,230)
Financial Assets, Collateral	0	0
Financial Assets, Net Amount	23	539
Financial Liabilities, Net Amount Recognized	24,205	10,430
Financial Liabilities, Financial Instruments	(6,296)	(2,230)
Financial Liabilities, Collateral	(17,886)	(8,034)
Financial Liabilities, Net Amount	$ 23	$ 166

Operating Segments (Details)

Operating Segments (Details) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2016USD ($)		Sep. 30, 2015USD ($)		Sep. 30, 2016USD ($)segment	Sep. 30, 2015USD ($)		Dec. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment					3
Number of segments | segment					3
Net interest income	$ 130,771		$ 115,969		$ 372,677	$ 343,837
Provision for credit losses	6,549		5,358		16,941	14,628
Non-interest income	108,387		82,251		282,080	246,468
Non-interest expense	170,385	[1]	134,266	[1]	454,091	406,923	[2]
Income tax expense	17,805		18,318		56,780	53,413
Net income	44,419		40,278		126,945	115,341
Total assets	19,341,882		14,950,101		19,341,882	14,950,101		$ 15,585,007
Taylor Capital Group, Inc.
Segment Reporting Information [Line Items]
Pretax merger related costs	11,400		389		17,200	9,600
Banking
Segment Reporting Information [Line Items]
Net interest income	119,685		104,714		341,445	313,192
Provision for credit losses	4,394		4,965		14,390	12,783
Non-interest income	40,533		31,572		112,221	94,197
Non-interest expense	117,211	[1]	88,276	[1]	307,733	271,248	[2]
Income tax expense	8,420		12,178		36,120	35,509
Net income	30,193		30,867		95,423	87,849
Total assets	16,453,379		12,759,341		16,453,379	12,759,341
Leasing
Segment Reporting Information [Line Items]
Net interest income	2,168		2,832		7,002	8,762
Provision for credit losses	1,964		242		2,045	1,598
Non-interest income	18,759		19,987		53,670	61,383
Non-interest expense	12,604	[1]	11,382	[1]	35,916	34,866	[2]
Income tax expense	2,484		4,398		8,872	13,218
Net income	3,875		6,797		13,839	20,463
Total assets	1,126,847		956,433		1,126,847	956,433
Mortgage Banking
Segment Reporting Information [Line Items]
Net interest income	8,918		8,423		24,230	21,883
Provision for credit losses	191		151		506	247
Non-interest income	49,095		30,692		116,189	90,888
Non-interest expense	40,570	[1]	34,608	[1]	110,442	100,809	[2]
Income tax expense	6,901		1,742		11,788	4,686
Net income	10,351		2,614		17,683	7,029
Total assets	$ 1,761,656		$ 1,234,327		$ 1,761,656	$ 1,234,327
[1]	Includes merger related and repositioning expenses of $11.4 million and $389 thousand in the Banking Segment for the three months ended September 30, 2016 and 2015, respectively.
[2]	Includes merger related and repositioning expenses of $17.2 million and $9.6 million in the Banking Segment for the nine months ended September 30, 2016 and 2015, respectively.

Preferred Stock (Details)

Preferred Stock (Details)	Aug. 24, 2016$ / sharesshares	Aug. 18, 2014shares	Sep. 30, 2016$ / sharesshares	Dec. 31, 2015$ / sharesshares
Taylor Capital Merger
Business Acquisition [Line Items]
Stock conversion		1
Preferred stock, shares outstanding (in shares)		4,000,000
Preferred stock, dividend rate (percent)			8.00%
American Chartered Merger
Business Acquisition [Line Items]
Stock conversion	1
Preferred stock, dividend rate (percent)	8.00%
Series A Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)			4,000,000	4,000,000
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares			$ 25	$ 25
Preferred stock, dividend rate (percent)			8.00%	8.00%
Series A Preferred Stock | Taylor Capital Merger
Business Acquisition [Line Items]
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares			$ 25
Series B Preferred Stock
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)			525	0
Preferred stock, dividend rate (percent)			8.00%
Series B Preferred Stock | American Chartered Merger
Business Acquisition [Line Items]
Preferred stock, shares outstanding (in shares)	525
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares	$ 1,000