Wintrust Financial (WTFC) 10-Q 8 Nov 19 2019 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2019	Oct. 31, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	001-35077
Entity Registrant Name	WINTRUST FINANCIAL CORP
Entity Incorporation, State or Country Code	IL
Entity Tax Identification Number	36-3873352
Entity Address, Address Line One	9700 W. Higgins Road, Suite 800
Entity Address, City or Town	Rosemont
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60018
City Area Code	847
Local Phone Number	939-9000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		57,072,339
Entity Central Index Key	0001015328
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Amendment Flag	false
Common Stock, no par value
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, no par value
Trading Symbol	WTFC
Security Exchange Name	NASDAQ
Series D Preferred Stock, no par value
Entity Information [Line Items]
Title of 12(b) Security	Series D Preferred Stock, no par value
Trading Symbol	WTFCM
Security Exchange Name	NASDAQ

Consolidated Statements Of Cond

Consolidated Statements Of Condition - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Assets
Cash and due from banks	$ 448,755	$ 392,142	$ 279,936
Federal funds sold and securities purchased under resale agreements	59	58	57
Interest bearing deposits with banks	2,260,806	1,099,594	1,137,044
Available-for-sale securities, at fair value	2,270,059	2,126,081	2,164,985
Held-to-maturity securities, at amortized cost ($1.1 billion, $1.0 billion and $911.6 million fair value at September 30, 2019, December 31, 2018, and September 30, 2018 respectively)	1,095,802	1,067,439	966,438
Trading account securities	3,204	1,692	688
Equity securities with readily determinable fair value	46,086	34,717	36,414
Federal Home Loan Bank and Federal Reserve Bank stock	92,714	91,354	99,998
Brokerage customer receivables	14,943	12,609	15,649
Mortgage loans held-for-sale, at fair value	464,727	264,070	338,111
Loans, net of unearned income	25,710,171	23,820,691	23,123,951
Allowance for loan losses	(161,763)	(152,770)	(149,756)
Net loans	25,548,408	23,667,921	22,974,195
Premises and equipment, net	721,856	671,169	664,469
Lease investments, net	228,647	233,208	199,241
Accrued interest receivable and other assets	1,087,864	696,707	700,568
Trade date securities receivable	0	263,523	0
Goodwill	584,315	573,141	537,560
Other intangible assets	43,657	49,424	27,378
Total assets	34,911,902	31,244,849	30,142,731
Deposits:
Non-interest bearing	7,067,960	6,569,880	6,399,213
Interest bearing	21,642,419	19,524,798	18,517,502
Total deposits	28,710,379	26,094,678	24,916,715
Federal Home Loan Bank advances	574,847	426,326	615,000
Other borrowings	410,488	393,855	373,571
Subordinated notes	435,979	139,210	139,172
Junior subordinated debentures	253,566	253,566	253,566
Trade date securities payable	226	0	0
Accrued interest payable and other liabilities	986,092	669,644	664,885
Total liabilities	31,371,577	27,977,279	26,962,909
Shareholders’ Equity:
Common stock, no par value; $1.00 stated value; 100,000,000 shares authorized at September 30, 2019, December 31, 2018 and September 30, 2018; 56,824,911 shares issued at September 30, 2019, 56,518,119 shares issued at December 31, 2018 and 56,486,573 shares issued at September 30, 2018	56,825	56,518	56,486
Surplus	1,574,011	1,557,984	1,553,353
Treasury stock, at cost, 126,482 shares at September 30, 2019, 110,561 shares at December 31, 2018, and 109,404 shares at September 30, 2018	(6,799)	(5,634)	(5,547)
Retained earnings	1,830,165	1,610,574	1,543,680
Accumulated other comprehensive loss	(38,877)	(76,872)	(93,150)
Total shareholders’ equity	3,540,325	3,267,570	3,179,822
Total liabilities and shareholders’ equity	34,911,902	31,244,849	30,142,731
Preferred stock, no par value; 20,000,000 shares authorized at September 30, 2019, December 31, 2018 and September 30, 2018; Series D - $25 liquidation value; 5,000,000 shares issued and outstanding at September 30, 2019, December 31, 2018 and September 30, 2018
Shareholders’ Equity:
Preferred stock, no par value; 20,000,000 shares authorized at September 30, 2019, December 31, 2018 and September 30, 2018; Series D - $25 liquidation value; 5,000,000 shares issued and outstanding at September 30, 2019, December 31, 2018 and September 30, 2018	$ 125,000	$ 125,000	$ 125,000

Consolidated Statements Of Co_2

Consolidated Statements Of Condition (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Held-to-maturity securities, at Fair value	$ 1,104,903	$ 1,036,096	$ 911,597
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000	20,000,000
Common stock, $1.00 stated value (usd per share)	$ 1	$ 1	$ 1
Common stock, 100,000,000 shares authorized (in shares)	100,000,000	100,000,000	100,000,000
Common stock, shares issued (in shares)	56,824,911	56,518,119	56,486,573
Treasury stock, (in shares)	126,482	110,561	109,404
Series D Preferred Stock
Preferred stock, liquidation value per share (usd per share)	$ 25	$ 25	$ 25
Preferred stock, shares outstanding (in shares)	5,000,000	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	5,000,000	5,000,000	5,000,000

Consolidated Statements Of Inco

Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income
Interest and fees on loans	$ 314,277	$ 271,134	$ 920,425	$ 761,191
Mortgage loans held-for-sale	3,478	5,285	8,791	12,329
Interest bearing deposits with banks	10,326	5,423	20,832	11,462
Federal funds sold and securities purchased under resale agreements	310	0	310	1
Investment securities	24,758	21,710	80,435	60,726
Trading account securities	20	11	33	29
Federal Home Loan Bank and Federal Reserve Bank stock	1,294	1,235	4,088	3,988
Brokerage customer receivables	164	164	497	488
Total interest income	354,627	304,962	1,035,411	850,214
Interest expense
Interest on deposits	76,168	48,736	204,168	110,578
Interest on Federal Home Loan Bank advances	1,774	1,947	8,417	9,849
Interest on other borrowings	3,466	2,003	10,624	5,400
Interest on subordinated notes	5,470	1,773	10,051	5,333
Interest on junior subordinated debentures	2,897	2,940	9,111	8,239
Total interest expense	89,775	57,399	242,371	139,399
Net interest income	264,852	247,563	793,040	710,815
Provision for credit losses	10,834	11,042	46,038	24,431
Net interest income after provision for credit losses	254,018	236,521	747,002	686,384
Non-interest income
Wealth management	23,999	22,634	72,115	68,237
Mortgage banking	50,864	42,014	106,433	112,808
Service charges on deposit accounts	40,834	38,722	120,281	114,313
Gains (losses) on investment securities, net	710	90	2,938	(249)
Fees from covered call options	0	627	2,427	2,893
Trading gains (losses), net	11	(61)	(204)	166
Operating lease income, net	12,025	9,132	34,554	27,569
Other	17,556	16,163	48,592	42,079
Total non-interest income	115,137	99,930	294,952	280,842
Non-interest expense
Salaries and employee benefits	141,024	123,855	400,479	357,966
Equipment	13,314	10,827	37,843	31,426
Operating lease equipment depreciation	8,907	7,370	25,994	20,843
Occupancy, net	14,991	14,404	47,157	41,834
Data processing	6,522	9,335	20,251	26,580
Advertising and marketing	13,375	11,120	36,078	31,726
Professional fees	8,037	9,914	19,821	23,047
Amortization of other intangible assets	2,928	1,163	8,827	3,164
FDIC insurance	148	4,205	7,851	13,165
OREO expense, net	1,170	596	3,092	4,502
Other	24,138	20,848	71,142	60,502
Total non-interest expense	234,554	213,637	678,535	614,755
Income before taxes	134,601	122,814	363,419	352,471
Income tax expense	35,480	30,866	93,686	88,962
Net income	99,121	91,948	269,733	263,509
Preferred stock dividends	2,050	2,050	6,150	6,150
Net income applicable to common shares	$ 97,071	$ 89,898	$ 263,583	$ 257,359
Net income per common share-Basic (usd per share)	$ 1.71	$ 1.59	$ 4.65	$ 4.57
Net income per common share-Diluted (usd per share)	1.69	1.57	4.60	4.50
Cash dividends declared per common share (usd per share)	$ 0.25	$ 0.19	$ 0.75	$ 0.57
Weighted average common shares outstanding (in shares)	56,690	56,366	56,627	56,268
Dilutive potential common shares (in shares)	773	918	724	912
Average common shares and dilutive common shares (in shares)	57,463	57,284	57,351	57,180
Service charges on deposit accounts
Non-interest income
Service charges on deposit accounts	$ 9,972	$ 9,331	$ 28,097	$ 27,339

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 99,121	$ 91,948	$ 269,733	$ 263,509
Unrealized gains (losses) on available-for-sale securities
Before tax	18,231	(18,149)	82,683	(63,788)
Tax effect	(4,860)	4,872	(22,156)	17,123
Net of tax	13,371	(13,277)	60,527	(46,665)
Reclassification of net gains on available-for-sale securities included in net income
Before tax	400	1,001	856	6
Tax effect	(108)	(271)	(230)	(1)
Net of tax	292	730	626	5
Reclassification of amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale
Before tax	58	33	416	49
Tax effect	(16)	(9)	(114)	(13)
Net of tax	42	24	302	36
Net unrealized gains (losses) on available-for-sale securities	13,037	(14,031)	59,599	(46,706)
Unrealized (losses) gains on derivative instruments
Before tax	(6,848)	212	(34,012)	4,369
Tax effect	1,834	(57)	9,097	(1,173)
Net unrealized (losses) gains on derivative instruments	(5,014)	155	(24,915)	3,196
Foreign currency adjustment
Before tax	(1,889)	2,586	4,234	(3,927)
Tax effect	418	(644)	(923)	976
Net foreign currency adjustment	(1,471)	1,942	3,311	(2,951)
Total other comprehensive income (loss)	6,552	(11,934)	37,995	(46,461)
Comprehensive income	$ 105,673	$ 80,014	$ 307,728	$ 217,048

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Preferred stock	Common stock	Surplus	Treasury stock	Retained earnings	Accumulated other comprehensive loss
Balance at Dec. 31, 2017	$ 2,976,939	$ 125,000	$ 56,068	$ 1,529,035	$ (4,986)	$ 1,313,657	$ (41,835)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment from the adoption of ASU 2018-02	(2,974)					2,974	(2,974)
Balance at Dec. 31, 2017	2,976,939	125,000	56,068	1,529,035	(4,986)	1,313,657	(41,835)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	263,509					263,509
Other comprehensive loss, net of tax	(46,461)						(46,461)
Cash dividends declared on common stock	(32,074)					(32,074)
Dividends on preferred stock, $1.23 per share	(6,150)					(6,150)
Stock-based compensation	10,346			10,346
Common stock issued for:
Exercise of stock options and warrants	11,043		283	10,952	(192)
Restricted stock awards	(369)		93	(93)	(369)
Employee stock purchase plan	1,885		23	1,862
Director compensation plan	1,270		19	1,251
Balance at Sep. 30, 2018	3,179,822	125,000	56,486	1,553,353	(5,547)	1,543,680	(93,150)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment from the adoption of new accounting pronouncement | ASU 2016-01	(1,880)					1,880	(1,880)
Cumulative effect adjustment from the adoption of new accounting pronouncement | ASU 2017-12	(116)					(116)
Balance at Jun. 30, 2018	3,106,871	125,000	56,437	1,547,511	(5,355)	1,464,494	(81,216)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	91,948					91,948
Other comprehensive loss, net of tax	(11,934)						(11,934)
Cash dividends declared on common stock	(10,712)					(10,712)
Dividends on preferred stock, $1.23 per share	(2,050)					(2,050)
Stock-based compensation	3,248			3,248
Common stock issued for:
Exercise of stock options and warrants	1,384		40	1,536	(192)
Restricted stock awards			1	(1)
Employee stock purchase plan	647		8	639
Director compensation plan	420			420
Balance at Sep. 30, 2018	3,179,822	125,000	56,486	1,553,353	(5,547)	1,543,680	(93,150)
Balance at Dec. 31, 2018	3,267,570	125,000	56,518	1,557,984	(5,634)	1,610,574	(76,872)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	269,733					269,733
Other comprehensive loss, net of tax	37,995						37,995
Cash dividends declared on common stock	(42,461)					(42,461)
Dividends on preferred stock, $1.23 per share	(6,150)					(6,150)
Stock-based compensation	8,278			8,278
Common stock issued for:
Exercise of stock options and warrants	3,613		112	4,225	(724)
Restricted stock awards	(441)		144	(144)	(441)
Employee stock purchase plan	2,131		32	2,099
Director compensation plan	1,588		19	1,569
Balance at Sep. 30, 2019	3,540,325	125,000	56,825	1,574,011	(6,799)	1,830,165	(38,877)
Balance at Jun. 30, 2019	3,446,950	125,000	56,794	1,569,969	(6,650)	1,747,266	(45,429)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	99,121					99,121
Other comprehensive loss, net of tax	6,552						6,552
Cash dividends declared on common stock	(14,172)					(14,172)
Dividends on preferred stock, $1.23 per share	(2,050)					(2,050)
Stock-based compensation	1,995			1,995
Common stock issued for:
Exercise of stock options and warrants	586		17	718	(149)
Restricted stock awards			2	(2)
Employee stock purchase plan	782		11	771
Director compensation plan	561		1	560
Balance at Sep. 30, 2019	$ 3,540,325	$ 125,000	$ 56,825	$ 1,574,011	$ (6,799)	$ 1,830,165	$ (38,877)

Consolidated Statements Of Ch_2

Consolidated Statements Of Changes In Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per common share (usd per share)	$ 0.25	$ 0.19	$ 0.75	$ 0.57
Dividends on preferred stock (usd per share)	$ 0.41	$ 0.41	$ 1.23	$ 1.23

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating Activities:
Net income	$ 269,733	$ 263,509
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	46,038	24,431
Depreciation, amortization and accretion, net	64,838	48,908
Stock-based compensation expense	8,278	10,346
Net amortization of premium on securities	4,501	5,998
Accretion of discount on loans	(17,335)	(15,510)
Mortgage servicing rights fair value change, net	30,417	(3,660)
Originations and purchases of mortgage loans held-for-sale	(3,252,539)	(3,027,658)
Proceeds from sales of mortgage loans held-for-sale	3,118,102	3,060,577
Bank owned life insurance (BOLI) income	(3,469)	(5,448)
(Increase) decrease in trading securities, net	(1,512)	307
Net (increase) decrease in brokerage customer receivables	(2,334)	10,782
Gains on mortgage loans sold	(96,631)	(80,826)
(Gains) losses on investment securities, net	(2,938)	249
Losses (gains) on sales of premises and equipment, net	43	(34)
Net losses on sales and fair value adjustments of other real estate owned	1,823	3,808
Increase in accrued interest receivable and other assets, net	(181,144)	(97,844)
(Decrease) increase in accrued interest payable and other liabilities, net	(8,826)	63,166
Net Cash (Used for) Provided by Operating Activities	(22,955)	261,101
Investing Activities:
Proceeds from maturities and calls of available-for-sale securities	391,434	222,387
Proceeds from maturities and calls of held-to-maturity securities	341,912	8,061
Proceeds from sales of available-for-sale securities	905,926	209,640
Proceeds from sales of equity securities with readily determinable fair value	16,200	1,895
Proceeds from sales and capital distributions of equity securities without readily determinable fair value	1,461	680
Purchases of available-for-sale securities	(1,098,566)	(777,324)
Purchases of held-to-maturity securities	(373,394)	(148,865)
Purchases of equity securities with readily determinable fair value	(25,677)	0
Purchases of equity securities without readily determinable fair value	(1,847)	(3,779)
Purchases of Federal Home Loan Bank and Federal Reserve Bank stock, net	(1,360)	(10,009)
Distributions from investments in partnerships, net	1,532	3,181
Net cash received (paid) in business combinations	748	(13,749)
Proceeds from sales of other real estate owned	9,656	16,892
Net increase in interest bearing deposits with banks	(1,161,452)	(75,636)
Net increase in loans	(1,744,613)	(1,304,555)
Redemption of BOLI	326	8,134
Purchases of premises and equipment, net	(51,450)	(52,639)
Net Cash Used for Investing Activities	(2,789,164)	(1,915,686)
Financing Activities:
Increase in deposit accounts	2,454,510	1,520,270
Increase in other borrowings, net	10,950	109,112
Increase in Federal Home Loan Bank advances, net	148,442	52,000
Proceeds from the issuance of subordinated notes, net	296,617	0
Cash payments to settle contingent consideration liabilities recognized in business combinations	(66)	0
Issuance of common shares resulting from the exercise of stock options, employee stock purchase plan and conversion of common stock warrants	8,056	14,390
Common stock repurchases for tax withholdings related to stock-based compensation	(1,165)	(561)
Dividends paid	(48,611)	(38,224)
Net Cash Provided by Financing Activities	2,868,733	1,656,987
Net Increase in Cash and Cash Equivalents	56,614	2,402
Cash and Cash Equivalents at Beginning of Period	392,200	277,591
Cash and Cash Equivalents at End of Period	$ 448,814	$ 279,993

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The interim consolidated financial statements of Wintrust Financial Corporation and Subsidiaries (“Wintrust” or the “Company”) presented herein are unaudited, but in the opinion of management reflect all necessary adjustments of a normal or recurring nature for a fair presentation of results as of the dates and for the periods covered by the interim consolidated financial statements. The accompanying interim consolidated financial statements are unaudited and do not include information or footnotes necessary for a complete presentation of financial condition, results of operations or cash flows in accordance with U.S. generally accepted accounting principles ("GAAP"). The interim unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 (“ 2018 Form 10-K”). Operating results reported for the period are not necessarily indicative of the results which may be expected for the entire year. Reclassifications of certain prior period amounts have been made to conform to the current period presentation. The preparation of the financial statements requires management to make estimates, assumptions and judgments that affect the reported amounts of assets and liabilities. Management believes that the estimates made are reasonable, however, changes in estimates may be required if economic or other conditions develop differently from management’s expectations. Certain policies and accounting principles inherently have a greater reliance on the use of estimates, assumptions and judgments and as such have a greater possibility of producing results that could be materially different than originally reported. Management views critical accounting policies to be those which are highly dependent on subjective or complex judgments, estimates and assumptions, and where changes in those estimates and assumptions could have a significant impact on the financial statements. Management currently views the determination of the allowance for loan losses and the allowance for losses on lending-related commitments, loans acquired with evidence of credit quality deterioration since origination, estimations of fair value, the valuations required for impairment testing of goodwill, the valuation and accounting for derivative instruments and income taxes as the accounting areas that require the most subjective and complex judgments, and as such could be the most subject to revision as new information becomes available. Descriptions of the Company's significant accounting policies are included in Note 1 - “Summary of Significant Accounting Policies” of the 2018 Form 10-K.

Recent Accounting Developments

Recent Accounting Developments	9 Months Ended
	Sep. 30, 2019
Accounting Changes and Error Corrections [Abstract]
Recent Accounting Developments	Recent Accounting Developments Leases In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842),” to improve transparency and comparability across entities regarding leasing arrangements. This ASU requires the recognition of a separate lease liability representing the required discounted lease payments over the lease term and a separate lease asset representing the right to use the underlying asset during the same lease term. Further, this ASU provides clarification regarding the identification of certain components of contracts that would represent a lease as well as requires additional disclosures to the notes of the financial statements. Additionally, in January 2018, the FASB issued ASU No. 2018-01, "Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842," to permit an entity to elect an optional practical expedient to not evaluate under Topic 842 land easements that exist or expired before the entity's adoption of Topic 842 and that were not previously accounted for as leases under existing accounting guidance. The FASB has continued to issue various updates to clarify and improve specific areas of ASU No. 2016-02. In July 2018, the FASB issued ASU No. 2018-10, “Codification Improvements to Topic 842, Leases,” to clarify the implementation guidance within ASU No. 2016-02 surrounding narrow aspects of Topic 842, including lessee reassessment of lease classifications, the rate implicit in a lease, lessor reassessment of lease terms and purchase options and variable lease payments that depend on an index or a rate. Also, in July 2018, the FASB issued ASU No. 2018-11, “Leases (Topic 842): Targeted Improvements,” to clarify the implementation guidance within ASU No. 2016-02 surrounding comparative period reporting requirements for initial adoption as well as separating lease and non-lease components in a contract and allocating consideration in the contract to the separate components. Also, in December 2018, the FASB issued ASU No. 2018-20, “Leases (Topic 842): Narrow-Scope Improvements for Lessors,” to clarify the implementation guidance within ASU No. 2016-02 surrounding specific aspects of lessor accounting. In March 2019, the FASB issued ASU No. 2019-01, “Codification Improvements to Topic 842, Leases,” to clarify the implementation guidance within ASU No. 2016-02 surrounding aspects of Topic 842, including determining the fair value of the underlying asset by lessors that are not manufacturers or dealers, presentation on the statement of cash flows, and transition disclosures related to Topic 250, Accounting Changes and Error Corrections. The Company adopted ASU No. 2016-02 and all subsequent updates issued to clarify and improve specific areas of this ASU as of January 1, 2019. The Company elected an o ptional transition method to apply the new guidance at the date of adoption (i.e. January 1, 2019) and continue applying current lease accounting guidance for comparative periods (i.e. reporting periods in 2018). As a result, as of January 1, 2019 , the Company recognized a separate lease liability and right-of-use asset of approximately $199.4 million and $170.6 million , respectively, for leasing arrangements in which the Company is a lessee. The difference in the separate lease liability and right-of-use asset represents any remaining amounts related to prepayments, payment deferrals and lease incentives as of January 1, 2019. As of September 30, 2019 , the separate lease liability and right-of-use asset was $192.1 million and $160.9 million , respectively. The separate liability and asset are included within accrued interest payable and other liabilities and accrued interest receivable and other assets, respectively, within the Company's Consolidated Statements of Condition. The leasing arrangements requiring recognition on the Consolidated Statements of Condition primarily related to certain banking facilities under operating lease agreements as well as other leasing arrangements in which the Company has the right-of-use of specific signage related to sponsorships and other agreements and certain automatic teller machines and other equipment. The Company utilized the following other transition elections and practical expedients: • For lessee arrangements of certain classes of underlying assets, including banking facilities and equipment, the Company elected the practical expedient to not separate non-lease components from lease components and instead to account for each separate lease and non-lease component as a single lease component. • For lessor arrangements that meet certain criteria (leasing of space in owned facilities), the Company elected the practical expedient to account for each separate lease and non-lease component as a single lease component. • A package of practical expedients applied to leases existing prior to the effective date that must all be elected together and allow a Company to not reassess: ◦ whether any expiring or existing contracts are or contain a lease; ◦ lease classification for any expired or existing leases; and ◦ whether initial direct costs for any expired or existing leases qualify for capitalization. • A practical expedient that permits the Company to continue applying its current policy for accounting for expired or existing land easements. • An accounting policy election for short-term leases (i.e. terms of 12 months or less with no purchase option expected to be exercised) to apply accounting similar to ASC 840, specifically to not recognize separate lease liabilities and right-of-use assets . As noted above, in accordance with ASU No. 2016-02 and all subsequent updates, the Company recognized a separate lease liability and right-of-use asset related to leasing arrangements in which the Company is the lessee of the identified asset. These lease arrangements include primarily the use of certain buildings, retail space and office space for the Company's operations and are considered operating leases. The underlying agreements of these arrangements often require fixed payments on a monthly basis. These fixed payments are included as consideration when measuring the separate lease liability and right-of-use asset noted above. Other payments are made on a monthly basis for certain items that are considered variable, including payments for insurance, real estate taxes and maintenance. Additionally, underlying agreements often have an initial period of use followed by certain extension periods. The Company considers such extensions for purposes of lease classification and the measurement of the separate lease liability and right-of-use asset. If the Company is reasonably certain to elect to extend the leasing arrangement, the lease term would include these periods for the purposes noted above. As a lessee, the Company cannot readily determine the rate implicit in the lease. As a result, the Company uses its incremental borrowing rate when measuring the separate lease liability and right-of-use asset. The Company estimated the incremental borrowing rate as the rate of interest that would be paid to borrow on a collateralized basis over a similar term in a similar economic environment. The following tables provide a summary of lease costs and future required fixed payments related to the Company's leasing arrangements in which it is the lessee: Three Months Ended Nine Months Ended (Dollars in thousands) September 30, September 30, Operating lease cost $ 5,299 $ 17,357 Finance lease cost: Amortization of right-of-use asset 15 15 Interest on lease liability 26 26 Short-term lease cost 134 446 Variable lease cost 724 2,213 Sublease income (164 ) (345 ) Total lease cost $ 6,034 $ 19,712 Cash paid for amounts included in the measurement of operating lease liabilities $ 6,458 $ 18,156 Cash paid for amounts included in the measurement of finance lease liabilities 24 24 Right-of-use asset obtained in exchange for new operating lease liabilities 587 3,635 Right-of-use asset obtained in exchange for new finance lease liabilities 3,498 3,498 Weighted average remaining lease term - operating leases 13.7 years Weighted average remaining lease term - finance leases 39.8 years Weighted average discount rate - operating leases 4.10 % Weighted average discount rate - finance leases 4.43 % (In thousands) Payments Remaining in 2019 $ 5,585 2020 23,253 2021 21,424 2022 20,728 2023 18,618 2024 17,741 2025 and thereafter 149,964 Total minimum future amounts $ 257,313 Impact of measuring the lease liability on a discounted basis (65,236 ) Total lease liability $ 192,077 Allowance for Credit Losses In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” to replace the current incurred loss methodology for recognizing credit losses, which delays recognition until it is probable a loss has been incurred, with a methodology that reflects an estimate of all expected credit losses and considers additional reasonable and supportable forecasted information when determining lifetime credit loss estimates. This impacts the calculation of an allowance for credit losses for all financial assets measured under the amortized cost basis, including held-to-maturity debt securities and purchased credit deteriorated ("PCD") assets at the time of and subsequent to acquisition. Additionally, credit losses related to available-for-sale debt securities would be recorded through the allowance for credit losses and not as a direct adjustment to the amortized cost of the securities. This guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and is to be applied under a modified retrospective approach through a cumulative-effect adjustment to the Company's Consolidated Statements of Condition as of the first reporting period of adoption. The FASB has continued to issue various updates to clarify and improve specific areas of ASU No. 2016-13. In November 2018, the FASB issued ASU No. 2018-19, “Codification Improvements to Topic 326, Financial Instruments—Credit Losses,” to clarify the implementation guidance within ASU No. 2016-13 surrounding narrow aspects of Topic 326, including the impact of the guidance on operating lease receivables. In May 2019, FASB issued ASU No. 2019-05, “Financial Instruments - Credit Losses (Topic 326): Targeted Transition Relief," allowing for the irrevocable election of the fair value option for certain financial assets, on an instrument-by-instrument basis, within the scope previously measured at amortized cost basis. Like ASU No. 2016-13, these ASUs are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and is to be applied under a modified retrospective approach. The Company has continued its efforts in implementation of ASU No. 2016-13 and all subsequent updates issued to clarify and improve specific areas of this ASU. As discussed previously, the Company established a committee consisting of individuals from various areas of the Company tasked with transitioning to the new requirements. Implementation activities in prior periods included a review of historical internal data, the development of modeling methodologies, including the determination of appropriate segmentation and assumptions, and the consideration of certain accounting policy elections. At this time, the Company has started the validation of model methodologies and parallel testing processes for its loan portfolios and held-to-maturity debt investment securities. Controls and processes have been designed and implemented for the continued implementation process and are being designed for the ongoing process following adoption. Further, as noted above, certain accounting policy elections are available under the new rules. At this time, the Company expects to utilize the following approach to such elections: • The Company expects to not measure an allowance for credit losses on accrued interest if such accrued interest is written off in a timely manner when deemed uncollectible. Any such write-off of accrued interest will reverse previously recognized interest income. • The Company expects to not include accrued interest within presentation and disclosures of the carrying amount of financial assets held at amortized cost. • The Company expects to estimate expected credit losses by measuring the face amount or unpaid principal balance component of the amortized cost basis of a financial asset separately from other components such as premiums, discount and deferred fees and costs. • The Company expects to not maintain current accounting policies for existing purchase credit impaired ("PCI") financial assets. At the effective date, such assets will be considered PCD assets and measured accordingly under the new rules. Goodwill In January 2017, the FASB issued ASU No. 2017-04, “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment,” to simplify the subsequent measurement of goodwill. When the carrying amount of a reporting unit exceeds its fair value, an entity would no longer be required to determine goodwill impairment by assigning the fair value of a reporting unit to all of its assets and liabilities as if that reporting unit was acquired in a business combination. Goodwill impairment would be recognized according to the excess of the carrying amount of the reporting unit over the calculated fair value of such unit. This guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and is to be applied under a prospective approach. The Company does not expect this guidance to have a material impact on the Company's consolidated financial statements. Amortization of Premium on Certain Debt Securities In March 2017, the FASB issued ASU No. 2017-08, “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities,” to amend the amortization period for certain purchased callable debt securities held at a premium. The amortization period for such securities will be shortened to the earliest call date. The Company adopted ASU No. 2017-08 as of January 1, 2019 under a modified retrospective approach. As a result, the Company recognized a cumulative effect adjustment of $1.5 million representing the accelerated amortization of premiums on certain callable debt securities directly to retained earnings on the Company's Consolidated Statements of Condition. Fair Value Measurement In August 2018, the FASB issued ASU No. 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirement for Fair Value Measurement,” to modify disclosure requirements on fair value measurements and inputs. This guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and is to be applied prospectively or retrospectively depending upon the disclosure requirement. Early adoption is permitted. The Company does not expect this guidance to have a material impact on the Company's consolidated financial statements. Intangibles In August 2018, the FASB issued ASU No. 2018-15, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract,” to align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with similar requirements related to implementation costs incurred to develop or obtain internal-use software. In addition, the amendment requires any capitalized implementation costs related to a hosting arrangement to be expensed over the term of the hosting arrangement. This guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and is to be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. Early adoption is permitted, including adoption in any interim period. The Company is currently evaluating the impact of adopting this new guidance on the consolidated financial statements. Codification Improvements In April 2019, the FASB issued ASU No. 2019-04, “Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments”. The FASB has continued to issue various updates to clarify and improve specific areas of ASU No. 2016-01, ASU No. 2016-13, and ASU No. 2017-12. Amendments related to ASU No. 2016-01 are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and can be early adopted, under a modified retrospective approach, since the Company has already adopted ASU No. 2016-01. Since the Company has not yet adopted ASU No. 2016-13, the effective dates and transition requirements for the amendments related to ASU No. 2019-04 are the same as the effective dates and transition requirements in ASU No. 2016-13 described above. Amendments related to ASU No. 2017-12 are effective as of the beginning of the first annual period beginning after the issuance date of ASU No. 2019-04 and can be early adopted since the Company has already adopted ASU No. 2017-12. The Company is currently evaluating the impact of adopting this new guidance on the consolidated financial statements.

Business Combinations and Asset

Business Combinations and Asset Acquisitions	9 Months Ended
	Sep. 30, 2019
Business Combinations And Asset Acquisitions [Abstract]
Business Combinations and Asset Acquisitions	Business Combinations and Asset Acquisitions Bank Acquisitions On May 24, 2019, the Company completed its acquisition of Rush-Oak Corporation ("ROC"). ROC was the parent company of Oak Bank. Through this business combination, the Company acquired Oak Bank's one banking location in Chicago, Illinois, as well as approximately $223.8 million in assets, including loans with a fair value of approximately $126.1 million , and deposits with a fair value of approximately $161.2 million . The Company recorded goodwill of $10.7 million on the acquisition. On December 7, 2018, the Company completed its acquisition of certain assets and the assumption of certain liabilities of American Enterprise Bank ("AEB"). Through this asset acquisition, the Company acquired approximately $164.0 million in assets, including loans with a fair value of approximately $119.3 million , and deposits with a fair value of approximately $150.8 million . On August 1, 2018, the Company completed its acquisition of Chicago Shore Corporation ("CSC"). CSC was the parent company of Delaware Place Bank. Through this business combination, the Company acquired Delaware Place Bank’s one banking location in Chicago, Illinois, approximately $282.8 million in assets, including loans with a fair value of approximately $152.7 million , and deposits with a fair value of approximately $213.1 million . Additionally, the Company recorded goodwill of $26.6 million on the acquisition. Mortgage Banking Acquisitions On January 4, 2018, the Company acquired iFreedom Direct Corporation DBA Veterans First Mortgage ("Veterans First") with assets including mortgage-servicing-rights on approximately 10,000 loans, totaling an estimated $1.6 billion in unpaid principal balance. The Company recorded goodwill of $9.1 million on the acquisition. Wealth Management Acquisitions On December 14, 2018, the Company acquired Elektra Holding Company, LLC ("Elektra"), the parent company of Chicago Deferred Exchange Company, LLC ("CDEC"). CDEC is a provider of Qualified Intermediary services (as defined by U.S. Treasury regulations) for taxpayers seeking to structure tax-deferred like-kind exchanges under Internal Revenue Code Section 1031. CDEC has successfully facilitated more than 8,000 like-kind exchanges in the past decade for taxpayers nationwide. These transactions typically generate customer deposits during the period following the sale of the property until such proceeds are used to purchase a replacement property. The Company recorded goodwill of $37.3 million on the acquisition. PCI Loans Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date. For PCI loans, expected future cash flows at the purchase date in excess of the fair value of loans are recorded as interest income over the life of the loans if the timing and amount of the future cash flows is reasonably estimable (“accretable yield”). The difference between contractually required payments and the cash flows expected to be collected at acquisition is referred to as the non-accretable difference and represents probable losses in the portfolio. In determining the acquisition date fair value of PCI loans, and in subsequent accounting, the Company aggregates these purchased loans into pools of loans by common risk characteristics, such as credit risk rating and loan type. Subsequent to the purchase date, increases in cash flows over those expected at the purchase date are recognized as interest income prospectively. Subsequent decreases to the expected cash flows will result in a provision for loan losses. The Company purchased a portfolio of life insurance premium finance receivables in 2009. These purchased life insurance premium finance receivables are valued on an individual basis. If credit related conditions deteriorate, an allowance related to these loans will be established as part of the provision for credit losses. See Note 6—Loans, for additional information on PCI loans.

Cash and Cash Equivalents

Cash and Cash Equivalents	9 Months Ended
	Sep. 30, 2019
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents For purposes of the Consolidated Statements of Cash Flows, the Company considers cash and cash equivalents to include cash on hand, cash items in the process of collection, non-interest bearing amounts due from correspondent banks, federal funds sold and securities purchased under resale agreements with original maturities of three months or less. These items are included within the Company’s Consolidated Statements of Condition as cash and due from banks, and federal funds sold and securities purchased under resale agreements.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The following tables are a summary of the investment securities portfolios as of the dates shown: September 30, 2019 (Dollars in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available-for-sale securities U.S. Treasury $ 220,756 $ 914 $ — $ 221,670 U.S. Government agencies 221,891 3,569 (1 ) 225,459 Municipal 141,311 4,896 (103 ) 146,104 Corporate notes: Financial issuers 97,058 126 (4,233 ) 92,951 Other 1,000 53 — 1,053 Mortgage-backed: (1) Mortgage-backed securities 1,529,749 18,682 (1,762 ) 1,546,669 Collateralized mortgage obligations 35,880 370 (97 ) 36,153 Total available-for-sale securities $ 2,247,645 $ 28,610 $ (6,196 ) $ 2,270,059 Held-to-maturity securities U.S. Government agencies $ 859,011 $ 3,310 $ (2,187 ) $ 860,134 Municipal 236,791 8,211 (233 ) 244,769 Total held-to-maturity securities $ 1,095,802 $ 11,521 $ (2,420 ) $ 1,104,903 Equity securities with readily determinable fair value $ 43,941 $ 2,794 $ (649 ) $ 46,086 December 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (Dollars in thousands) Available-for-sale securities U.S. Treasury $ 126,199 $ 391 $ (186 ) $ 126,404 U.S. Government agencies 139,420 917 (30 ) 140,307 Municipal 136,831 2,427 (768 ) 138,490 Corporate notes: Financial issuers 97,079 35 (7,069 ) 90,045 Other 1,000 — — 1,000 Mortgage-backed: (1) Mortgage-backed securities 1,641,146 2,510 (57,317 ) 1,586,339 Collateralized mortgage obligations 43,819 500 (823 ) 43,496 Total available-for-sale securities $ 2,185,494 $ 6,780 $ (66,193 ) $ 2,126,081 Held-to-maturity securities U.S. Government agencies $ 814,864 $ 1,141 $ (28,576 ) $ 787,429 Municipal 252,575 1,100 (5,008 ) 248,667 Total held-to-maturity securities $ 1,067,439 $ 2,241 $ (33,584 ) $ 1,036,096 Equity securities with readily determinable fair value $ 34,410 $ 1,532 $ (1,225 ) $ 34,717 (1) Consisting entirely of residential mortgage-backed securities, none of which are subprime. September 30, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (Dollars in thousands) Available-for-sale securities U.S. Treasury $ 125,153 $ — $ (392 ) $ 124,761 U.S. Government agencies 111,997 8 (985 ) 111,020 Municipal 133,006 1,481 (1,114 ) 133,373 Corporate notes: Financial issuers 97,085 87 (4,719 ) 92,453 Other 1,000 — — 1,000 Mortgage-backed: (1) Mortgage-backed securities 1,744,600 121 (87,950 ) 1,656,771 Collateralized mortgage obligations 47,909 4 (2,306 ) 45,607 Total available-for-sale securities $ 2,260,750 $ 1,701 $ (97,466 ) $ 2,164,985 Held-to-maturity securities U.S. Government agencies $ 713,423 $ — $ (47,706 ) $ 665,717 Municipal 253,015 629 (7,764 ) 245,880 Total held-to-maturity securities $ 966,438 $ 629 $ (55,470 ) $ 911,597 Equity securities with readily determinable fair value $ 33,512 $ 4,206 $ (1,304 ) $ 36,414 (1) Consisting entirely of residential mortgage-backed securities, none of which are subprime. Equity securities without readily determinable fair values totaled $27.0 million as of September 30, 2019 . Equity securities without readily determinable fair values are included as part of accrued interest receivable and other assets in the Company's Consolidated Statements of Condition. The Company recorded a no upward adjustment and no downward adjustments on such securities in the third quarter of 2019 related to observable price changes in orderly transactions for the identical or a similar investment of the same issuer. The Company monitors its equity investments without a readily determinable fair values to identify potential transactions that may indicate an observable price change requiring adjustment to its carrying amount. The following table presents the portion of the Company’s available-for-sale and held-to-maturity investment securities portfolios which has gross unrealized losses, reflecting the length of time that individual securities have been in a continuous unrealized loss position at September 30, 2019 : Continuous unrealized losses existing for less than 12 months Continuous unrealized losses existing for greater than 12 months Total (Dollars in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Available-for-sale securities U.S. Treasury $ — $ — $ — $ — $ — $ — U.S. Government agencies 1,950 (1 ) — — 1,950 (1 ) Municipal 5,505 (38 ) 1,532 (65 ) 7,037 (103 ) Corporate notes: Financial issuers 6,617 (377 ) 63,126 (3,856 ) 69,743 (4,233 ) Other — — — — — — Mortgage-backed: Mortgage-backed securities 778,842 (1,743 ) 1,243 (19 ) 780,085 (1,762 ) Collateralized mortgage obligations 1,598 (19 ) 5,798 (78 ) 7,396 (97 ) Total available-for-sale securities $ 794,512 $ (2,178 ) $ 71,699 $ (4,018 ) $ 866,211 $ (6,196 ) Held-to-maturity securities U.S. Government agencies $ 232,535 $ (2,186 ) $ 2,000 $ (1 ) $ 234,535 $ (2,187 ) Municipal 7,102 (39 ) 3,591 (194 ) 10,693 (233 ) Total held-to-maturity securities $ 239,637 $ (2,225 ) $ 5,591 $ (195 ) $ 245,228 $ (2,420 ) The Company conducts a regular assessment of its investment securities to determine whether securities are other-than-temporarily impaired considering, among other factors, the nature of the securities, credit ratings or financial condition of the issuer, the extent and duration of the unrealized loss, expected cash flows, market conditions and the Company’s ability to hold the securities through the anticipated recovery period. The Company does not consider securities with unrealized losses at September 30, 2019 to be other-than-temporarily impaired. The Company does not intend to sell these investments and it is more likely than not that the Company will not be required to sell these investments before recovery of the amortized cost bases, which may be the maturity dates of the securities. The unrealized losses within each category have occurred as a result of changes in interest rates, market spreads and market conditions subsequent to purchase. Securities with continuous unrealized losses existing for more than twelve months were primarily mortgage-backed securities, U.S. Government agency securities and corporate notes. The following table provides information as to the amount of gross gains and losses, adjustments and impairment on investment securities recognized in earnings and proceeds received through the sale or call of investment securities: Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2019 2018 2019 2018 Realized gains on investment securities $ 801 $ 1,051 $ 1,348 $ 1,057 Realized losses on investment securities (5 ) (50 ) (96 ) (1,051 ) Net realized gains on investment securities 796 $ 1,001 1,252 $ 6 Unrealized gains on equity securities with readily determinable fair value 165 530 2,299 2,632 Unrealized losses on equity securities with readily determinable fair value (251 ) (1,111 ) (460 ) (2,176 ) Net unrealized (losses) gains on equity securities with readily determinable fair value (86 ) (581 ) 1,839 456 Upward adjustments of equity securities without readily determinable fair values — — 110 156 Downward adjustments of equity securities without readily determinable fair values — — — — Impairment of equity securities without readily determinable fair values — (330 ) (263 ) (867 ) Adjustment and impairment, net, of equity securities without readily determinable fair values — (330 ) (153 ) (711 ) Other than temporary impairment charges — — — — Gains (losses) on investment securities, net $ 710 $ 90 $ 2,938 $ (249 ) Proceeds from sales of available-for-sale securities (1) $ 238,008 $ 649 $ 905,926 $ 209,640 Proceeds from sales of equity securities with readily determinable fair value 5,200 1,895 16,200 1,895 Proceeds from sales and capital distributions of equity securities without readily determinable fair value 852 64 1,461 680 (1) Includes proceeds from available-for-sale securities sold in accordance with written covered call options sold to a third party. During the nine months ended September 30, 2019 , the Company recorded $263,000 of impairment of equity securities without readily determinable fair values. The Company conducts a quarterly assessment of its equity securities without a readily determinable fair values to determine whether impairment exists in such securities, considering, among other factors, the nature of the securities, financial condition of the issuer and expected future cash flows. The amortized cost and fair value of available-for-sale and held-to-maturity investment securities as of September 30, 2019 , December 31, 2018 and September 30, 2018 , by contractual maturity, are shown in the following table. Contractual maturities may differ from actual maturities as borrowers may have the right to call or repay obligations with or without call or prepayment penalties. Mortgage-backed securities are not included in the maturity categories in the following maturity summary as actual maturities may differ from contractual maturities because the underlying mortgages may be called or prepaid without penalties: September 30, 2019 December 31, 2018 September 30, 2018 (Dollars in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Available-for-sale securities Due in one year or less $ 201,572 $ 201,866 $ 82,206 $ 82,153 $ 128,184 $ 127,844 Due in one to five years 141,319 143,804 168,855 169,307 174,968 174,877 Due in five to ten years 200,118 198,250 121,129 115,206 118,229 113,875 Due after ten years 139,007 143,317 128,339 129,580 46,860 46,011 Mortgage-backed 1,565,629 1,582,822 1,684,965 1,629,835 1,792,509 1,702,378 Total available-for-sale securities $ 2,247,645 $ 2,270,059 $ 2,185,494 $ 2,126,081 $ 2,260,750 $ 2,164,985 Held-to-maturity securities Due in one year or less $ 7,748 $ 7,749 $ 10,009 $ 9,979 $ 5,521 $ 5,511 Due in one to five years 28,138 28,335 29,436 28,995 31,782 31,160 Due in five to ten years 231,021 235,138 295,897 290,206 255,146 243,608 Due after ten years 828,895 833,681 732,097 706,916 673,989 631,318 Total held-to-maturity securities $ 1,095,802 $ 1,104,903 $ 1,067,439 $ 1,036,096 $ 966,438 $ 911,597 Securities having a fair value of $1.9 billion at September 30, 2019 as well as securities having a fair value of $1.7 billion and $1.7 billion at December 31, 2018 and September 30, 2018 , respectively, were pledged as collateral for public deposits, trust deposits, Federal Home Loan Bank ("FHLB") advances, securities sold under repurchase agreements and derivatives. At September 30, 2019 , there were no securities of a single issuer, other than U.S. Government-sponsored agency securities, which exceeded 10% of shareholders’ equity.

Loans

Loans	9 Months Ended
	Sep. 30, 2019
Loans and Leases Receivable Disclosure [Abstract]
Loans	Loans The following table shows the Company’s loan portfolio by category as of the dates shown: September 30, December 31, September 30, (Dollars in thousands) 2019 2018 2018 Balance: Commercial $ 8,195,602 $ 7,828,538 $ 7,473,958 Commercial real estate 7,448,667 6,933,252 6,746,774 Home equity 512,303 552,343 578,844 Residential real estate 1,218,666 1,002,464 924,250 Premium finance receivables—commercial 3,449,950 2,841,659 2,885,327 Premium finance receivables—life insurance 4,795,496 4,541,794 4,398,971 Consumer and other 89,487 120,641 115,827 Total loans, net of unearned income $ 25,710,171 $ 23,820,691 $ 23,123,951 Mix: Commercial 32 % 33 % 32 % Commercial real estate 29 29 29 Home equity 2 2 3 Residential real estate 5 4 4 Premium finance receivables—commercial 13 12 12 Premium finance receivables—life insurance 19 19 19 Consumer and other 0 1 1 Total loans, net of unearned income 100 % 100 % 100 % The Company’s loan portfolio is generally comprised of loans to consumers and small to medium-sized businesses located within the geographic market areas that the banks serve. The premium finance receivables portfolios are made to customers throughout the United States and Canada. The Company strives to maintain a loan portfolio that is diverse in terms of loan type, industry, borrower and geographic concentrations. Such diversification reduces the exposure to economic downturns that may occur in different segments of the economy or in different industries. Certain premium finance receivables are recorded net of unearned income. The unearned income portions of such premium finance receivables were $117.5 million at September 30, 2019 , $112.9 million at December 31, 2018 and $98.1 million at September 30, 2018 . Total loans, excluding PCI loans, include net deferred loan fees and costs and fair value purchase accounting adjustments totaling $8.9 million at September 30, 2019 , $4.5 million at December 31, 2018 and $6.5 million at September 30, 2018 . PCI loans are recorded net of credit discounts. See “Acquired Loan Information at Acquisition - PCI Loans” below. It is the policy of the Company to review each prospective credit in order to determine the appropriateness and, when required, the adequacy of security or collateral necessary to obtain when making a loan. The type of collateral, when required, will vary from liquid assets to real estate. The Company seeks to ensure access to collateral, in the event of default, through adherence to state lending laws and the Company’s credit monitoring procedures. Acquired Loan Information at Acquisition—PCI Loans As part of the Company's previous acquisitions, the Company acquired loans for which there was evidence of credit quality deterioration since origination (PCI loans) and determined that it was probable that the Company would be unable to collect all contractually required principal and interest payments. The following table presents the unpaid principal balance and carrying value for these acquired loans: September 30, 2019 December 31, 2018 (In thousands) Unpaid Principal Balance Carrying Value Unpaid Carrying PCI loans $ 311,258 $ 286,009 $ 341,555 $ 318,394 The following table provides estimated details as of the date of acquisition on loans acquired during the first nine months of 2019 with evidence of credit quality deterioration since origination: (In thousands) ROC Contractually required payments including interest $ 27,510 Less: Nonaccretable difference 2,162 Cash flows expected to be collected (1) 25,348 Less: Accretable yield 1,874 Fair value of PCI loans acquired $ 23,474 (1) Represents undiscounted expected principal and interest cash at acquisition. See Note 7—Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans for further discussion regarding the allowance for loan losses associated with PCI loans at September 30, 2019 . Accretable Yield Activity - PCI Loans Changes in expected cash flows may vary from period to period as the Company periodically updates its cash flow model assumptions for PCI loans. The factors that most significantly affect the estimates of gross cash flows expected to be collected, and accordingly the accretable yield, include changes in the benchmark interest rate indices for variable-rate products and changes in prepayment assumptions and loss estimates. The following table provides activity for the accretable yield of PCI loans: Three Months Ended Nine Months Ended (In thousands) September 30, September 30, September 30, September 30, Accretable yield, beginning balance $ 34,289 $ 34,347 $ 34,876 $ 36,565 Acquisitions — 2,321 1,874 2,321 Accretable yield amortized to interest income (4,266 ) (4,144 ) (12,179 ) (12,915 ) Reclassification from non-accretable difference (1) 184 1,734 2,190 4,596 Increases in interest cash flows due to payments and changes in interest rates 1,164 (1,093 ) 4,610 2,598 Accretable yield, ending balance $ 31,371 $ 33,165 $ 31,371 $ 33,165 (1) Reclassification is the result of subsequent increases in expected principal cash flows. Accretion to interest income accounted for under ASC 310-30 totaled $4.3 million and $4.1 million in the third quarter of 2019 and 2018 , respectively. For the first nine months ended September 30, 2019 and 2018 , the Company recorded accretion to interest income of $12.2 million and $12.9 million

Allowance for Loan Losses, Allo

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans	9 Months Ended
	Sep. 30, 2019
Receivables [Abstract]
Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans	Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans The tables below show the aging of the Company’s loan portfolio at September 30, 2019 , December 31, 2018 and September 30, 2018 : As of September 30, 2019 90+ days and still accruing 60-89 days past due 30-59 days past due (In thousands) Nonaccrual Current Total Loans Loan Balances: Commercial Commercial, industrial and other $ 34,397 $ — $ 2,296 $ 16,995 $ 5,096,879 $ 5,150,567 Franchise 3,752 — — 7,327 903,695 914,774 Mortgage warehouse lines of credit — — — 3,196 311,501 314,697 Asset-based lending 5,782 — 9,521 23,369 1,007,197 1,045,869 Leases — — — 393 753,770 754,163 PCI - commercial (1) — 382 1,043 207 13,900 15,532 Total commercial 43,931 382 12,860 51,487 8,086,942 8,195,602 Commercial real estate: Construction 1,030 — — 2,103 847,442 850,575 Land 994 — 88 4,947 169,357 175,386 Office 8,158 — 158 2,145 986,470 996,931 Industrial 100 — 950 961 1,007,669 1,009,680 Retail 7,174 — 2,235 3,684 991,627 1,004,720 Multi-family 690 — 1,073 2,265 1,287,797 1,291,825 Mixed use and other 3,411 — 928 10,084 1,987,844 2,002,267 PCI - commercial real estate (1) — 4,992 4,197 6,909 101,185 117,283 Total commercial real estate 21,557 4,992 9,629 33,098 7,379,391 7,448,667 Home equity 7,920 — 95 3,100 501,188 512,303 Residential real estate, including PCI 13,447 3,244 1,868 1,433 1,198,674 1,218,666 Premium finance receivables Commercial insurance loans 15,950 10,612 8,853 16,972 3,397,563 3,449,950 Life insurance loans 590 — 17,753 27,795 4,608,450 4,654,588 PCI - life insurance loans (1) — — — — 140,908 140,908 Consumer and other, including PCI 224 117 55 272 88,819 89,487 Total loans, net of unearned income $ 103,619 $ 19,347 $ 51,113 $ 134,157 $ 25,401,935 $ 25,710,171 (1) PCI loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. Loan agings are based upon contractually required payments. As of December 31, 2018 90+ days and still accruing 60-89 days past due 30-59 days past due (In thousands) Nonaccrual Current Total Loans Loan Balances: Commercial Commercial, industrial and other $ 34,298 $ — $ 1,451 $ 21,618 $ 5,062,729 $ 5,120,096 Franchise 16,051 — — 8,738 924,190 948,979 Mortgage warehouse lines of credit — — — — 144,199 144,199 Asset-based lending 635 — 200 3,156 1,022,065 1,026,056 Leases — — — 1,250 564,430 565,680 PCI - commercial (1) — 3,313 — 99 20,116 23,528 Total commercial 50,984 3,313 1,651 34,861 7,737,729 7,828,538 Commercial real estate Construction 1,554 — — 9,424 749,846 760,824 Land 107 — 170 107 141,097 141,481 Office 3,629 — 877 5,077 929,739 939,322 Industrial 285 — — 16,596 885,367 902,248 Retail 10,753 — 1,890 1,729 878,106 892,478 Multi-family 311 — 77 5,575 970,597 976,560 Mixed use and other 2,490 — 1,617 8,983 2,192,105 2,205,195 PCI - commercial real estate (1) — 6,241 6,195 4,075 98,633 115,144 Total commercial real estate 19,129 6,241 10,826 51,566 6,845,490 6,933,252 Home equity 7,147 — 131 3,105 541,960 552,343 Residential real estate, including PCI 16,383 1,292 1,692 6,171 976,926 1,002,464 Premium finance receivables Commercial insurance loans 11,335 7,799 11,382 15,085 2,796,058 2,841,659 Life insurance loans — — 8,407 24,628 4,340,856 4,373,891 PCI - life insurance loans (1) — — — — 167,903 167,903 Consumer and other, including PCI 348 227 87 733 119,246 120,641 Total loans, net of unearned income $ 105,326 $ 18,872 $ 34,176 $ 136,149 $ 23,526,168 $ 23,820,691 (1) PCI loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. Loan agings are based upon contractually required payments. As of September 30, 2018 90+ days and still accruing 60-89 days past due 30-59 days past due (In thousands) Nonaccrual Current Total Loans Loan Balances: Commercial Commercial, industrial and other $ 41,322 $ — $ 2,535 $ 16,451 $ 4,745,178 $ 4,805,486 Franchise 16,351 5,122 — — 915,817 937,290 Mortgage warehouse lines of credit — — 3,000 — 168,860 171,860 Asset-based lending 910 — 590 9,083 1,023,268 1,033,851 Leases 4 — — 80 509,591 509,675 PCI - commercial (1) — 3,372 15 — 12,409 15,796 Total commercial 58,587 8,494 6,140 25,614 7,375,123 7,473,958 Commercial real estate: Construction 1,554 — 1,823 16,228 778,725 798,330 Land 228 — 365 — 118,411 119,004 Office 1,532 — 4,058 3,021 932,166 940,777 Industrial 178 — 122 145 885,486 885,931 Retail 10,586 — 4,570 10,645 861,901 887,702 Multi-family 318 — — 1,162 922,413 923,893 Mixed use and other 3,119 — 9,654 11,503 2,062,179 2,086,455 PCI - commercial real estate (1) — 5,578 6,448 1,380 91,276 104,682 Total commercial real estate 17,515 5,578 27,040 44,084 6,652,557 6,746,774 Home equity 8,523 — 1,075 3,478 565,768 578,844 Residential real estate, including PCI 16,062 1,865 1,714 603 904,006 924,250 Premium finance receivables Commercial insurance loans 13,802 7,028 5,945 13,239 2,845,313 2,885,327 Life insurance loans — — — 22,016 4,203,465 4,225,481 PCI - life insurance loans (1) — — — — 173,490 173,490 Consumer and other, including PCI 355 295 430 329 114,418 115,827 Total loans, net of unearned income $ 114,844 $ 23,260 $ 42,344 $ 109,363 $ 22,834,140 $ 23,123,951 (1) PCI loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. Loan agings are based upon contractually required payments. The Company's ability to manage credit risk depends in large part on our ability to properly identify and manage problem loans. To do so, the Company operates a credit risk rating system under which our credit management personnel assign a credit risk rating (1 to 10 rating) to each loan at the time of origination and review loans on a regular basis. Each loan officer is responsible for monitoring his or her loan portfolio, recommending a credit risk rating for each loan in his or her portfolio and ensuring the credit risk ratings are appropriate. These credit risk ratings are then ratified by the bank’s chief credit officer and/or concurrence credit officer. Credit risk ratings are determined by evaluating a number of factors including: a borrower’s financial strength, cash flow coverage, collateral protection and guarantees. The Company’s Problem Loan Reporting system automatically includes all loans with credit risk ratings of 6 through 9. This system is designed to provide an on-going detailed tracking mechanism for each problem loan. Once management determines that a loan has deteriorated to a point where it has a credit risk rating of 6 or worse, the Company’s Managed Asset Division performs an overall credit and collateral review. As part of this review, all underlying collateral is identified and the valuation methodology is analyzed and tracked. As a result of this initial review by the Company’s Managed Asset Division, the credit risk rating is reviewed and a portion of the outstanding loan balance may be deemed uncollectible or an impairment reserve may be established. The Company’s impairment analysis utilizes an independent re-appraisal of the collateral (unless such a third-party evaluation is not possible due to the unique nature of the collateral, such as a closely-held business or thinly traded securities). In the case of commercial real estate collateral, an independent third party appraisal is ordered by the Company’s Real Estate Services Group to determine if there has been any change in the underlying collateral value. These independent appraisals are reviewed by the Real Estate Services Group and sometimes by independent third party valuation experts and may be adjusted depending upon market conditions. Through the credit risk rating process, loans are reviewed to determine if they are performing in accordance with the original contractual terms. If the borrower has failed to comply with the original contractual terms, further action may be required by the Company, including a downgrade in the credit risk rating, movement to non-accrual status, a charge-off or the establishment of a specific impairment reserve. If a loan amount, or portion thereof, is determined to be uncollectible, the loan’s credit risk rating is immediately downgraded to an 8 or 9 and the uncollectible amount is charged-off. Any loan that has a partial charge-off continues to be assigned a credit risk rating of an 8 or 9 for the duration of time that a balance remains outstanding. The Company undertakes a thorough and ongoing analysis to determine if additional impairment and/or charge-offs are appropriate and to begin a workout plan for the credit to minimize actual losses. If, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement, a specific impairment reserve is established. In determining the appropriate charge-off for collateral-dependent loans, the Company considers the results of appraisals for the associated collateral. Non-performing loans include all non-accrual loans (8 and 9 risk ratings) as well as loans 90 days past due and still accruing interest, excluding PCI loans. The remainder of the portfolio is considered performing under the contractual terms of the loan agreement. The following table presents the recorded investment based on performance of loans by class, per the most recent analysis at September 30, 2019 , December 31, 2018 and September 30, 2018 : Performing Non-performing Total (In thousands) September 30, December 31, September 30, September 30, December 31, September 30, September 30, December 31, September 30, Loan Balances: Commercial Commercial, industrial and other $ 5,116,170 $ 5,085,798 $ 4,764,164 $ 34,397 $ 34,298 $ 41,322 $ 5,150,567 $ 5,120,096 $ 4,805,486 Franchise 911,022 932,928 915,817 3,752 16,051 21,473 914,774 948,979 937,290 Mortgage warehouse lines of credit 314,697 144,199 171,860 — — — 314,697 144,199 171,860 Asset-based lending 1,040,087 1,025,421 1,032,941 5,782 635 910 1,045,869 1,026,056 1,033,851 Leases 754,163 565,680 509,671 — — 4 754,163 565,680 509,675 PCI - commercial (1) 15,532 23,528 15,796 — — — 15,532 23,528 15,796 Total commercial 8,151,671 7,777,554 7,410,249 43,931 50,984 63,709 8,195,602 7,828,538 7,473,958 Commercial real estate Construction 849,545 759,270 796,776 1,030 1,554 1,554 850,575 760,824 798,330 Land 174,392 141,374 118,776 994 107 228 175,386 141,481 119,004 Office 988,773 935,693 939,245 8,158 3,629 1,532 996,931 939,322 940,777 Industrial 1,009,580 901,963 885,753 100 285 178 1,009,680 902,248 885,931 Retail 997,546 881,725 877,116 7,174 10,753 10,586 1,004,720 892,478 887,702 Multi-family 1,291,135 976,249 923,575 690 311 318 1,291,825 976,560 923,893 Mixed use and other 1,998,856 2,202,705 2,083,336 3,411 2,490 3,119 2,002,267 2,205,195 2,086,455 PCI - commercial real estate (1) 117,283 115,144 104,682 — — — 117,283 115,144 104,682 Total commercial real estate 7,427,110 6,914,123 6,729,259 21,557 19,129 17,515 7,448,667 6,933,252 6,746,774 Home equity 504,383 545,196 570,321 7,920 7,147 8,523 512,303 552,343 578,844 Residential real estate, including PCI 1,205,219 986,081 908,188 13,447 16,383 16,062 1,218,666 1,002,464 924,250 Premium finance receivables Commercial insurance loans 3,423,388 2,822,525 2,864,497 26,562 19,134 20,830 3,449,950 2,841,659 2,885,327 Life insurance loans 4,653,998 4,373,891 4,225,481 590 — — 4,654,588 4,373,891 4,225,481 PCI - life insurance loans (1) 140,908 167,903 173,490 — — — 140,908 167,903 173,490 Consumer and other, including PCI 89,210 120,184 115,239 277 457 588 89,487 120,641 115,827 Total loans, net of unearned income $ 25,595,887 $ 23,707,457 $ 22,996,724 $ 114,284 $ 113,234 $ 127,227 $ 25,710,171 $ 23,820,691 $ 23,123,951 (1) PCI loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. See Note 6 - Loans for further discussion of these purchased loans. A summary of activity in the allowance for credit losses by loan portfolio for the three and nine months ended September 30, 2019 and 2018 is as follows: Three months ended September 30, 2019 Commercial Real Estate Home Equity Residential Real Estate Premium Finance Receivables Consumer and Other Total Loans (In thousands) Commercial Allowance for credit losses Allowance for loan losses at beginning of period $ 74,893 $ 63,270 $ 3,631 $ 8,146 $ 8,940 $ 1,541 $ 160,421 Other adjustments — — — — (13 ) — (13 ) Reclassification from allowance for unfunded lending-related commitments — (30 ) — — — — (30 ) Charge-offs (6,775 ) (809 ) (1,594 ) (25 ) (1,866 ) (117 ) (11,186 ) Recoveries 367 385 183 203 563 36 1,737 Provision for credit losses 4,642 2,122 1,500 1,087 1,742 (259 ) 10,834 Allowance for loan losses at period end $ 73,127 $ 64,938 $ 3,720 $ 9,411 $ 9,366 $ 1,201 $ 161,763 Allowance for unfunded lending-related commitments at period end $ — $ 1,510 $ — $ — $ — $ — $ 1,510 Allowance for credit losses at period end $ 73,127 $ 66,448 $ 3,720 $ 9,411 $ 9,366 $ 1,201 $ 163,273 Individually evaluated for impairment $ 10,606 $ 3,600 $ 313 $ 315 $ — $ 106 $ 14,940 Collectively evaluated for impairment 62,160 62,795 3,407 9,037 9,366 1,095 147,860 Loans acquired with deteriorated credit quality 361 53 — 59 — — 473 Loans at period end Individually evaluated for impairment $ 58,030 $ 32,155 $ 18,702 $ 21,889 $ — $ 274 $ 131,050 Collectively evaluated for impairment 8,122,040 7,299,229 493,601 1,070,795 8,104,538 86,887 25,177,090 Loans acquired with deteriorated credit quality 15,532 117,283 — 9,960 140,908 2,326 286,009 Loans held at fair value — — — 116,022 — — 116,022 Three months ended September 30, 2018 Commercial Commercial Real Estate Home Equity Residential Real Estate Premium Finance Receivables Consumer and Other Total Loans (In thousands) Allowance for credit losses Allowance for loan losses at beginning of period $ 60,727 $ 57,660 $ 9,551 $ 6,336 $ 7,734 $ 1,394 $ 143,402 Other adjustments (1 ) (15 ) (2 ) (14 ) 14 — (18 ) Reclassification from allowance for unfunded lending-related commitments — (2 ) — — — — (2 ) Charge-offs (3,219 ) (208 ) (561 ) (337 ) (2,512 ) (144 ) (6,981 ) Recoveries 304 193 142 466 1,142 66 2,313 Provision for credit losses 8,934 619 13 (160 ) 1,796 (160 ) 11,042 Allowance for loan losses at period end $ 66,745 $ 58,247 $ 9,143 $ 6,291 $ 8,174 $ 1,156 $ 149,756 Allowance for unfunded lending-related commitments at period end $ — $ 1,245 $ — $ — $ — $ — $ 1,245 Allowance for credit losses at period end $ 66,745 $ 59,492 $ 9,143 $ 6,291 $ 8,174 $ 1,156 $ 151,001 Individually evaluated for impairment $ 10,164 $ 3,158 $ 611 $ 325 $ — $ 117 $ 14,375 Collectively evaluated for impairment 55,987 56,316 8,532 5,894 8,174 1,039 135,942 Loans acquired with deteriorated credit quality 594 18 — 72 — — 684 Loans at period end Individually evaluated for impairment $ 67,381 $ 31,952 $ 11,284 $ 21,781 $ — $ 401 $ 132,799 Collectively evaluated for impairment 7,390,781 6,610,140 567,560 815,442 7,110,808 113,812 22,608,543 Loans acquired with deteriorated credit quality 15,796 104,682 — 9,144 173,490 1,614 304,726 Loans held at fair value — — — 77,883 — — 77,883 Nine months ended September 30, 2019 Commercial Real Estate Home Equity Residential Real Estate Premium Finance Receivable Consumer and Other Total Loans (In thousands) Commercial Allowance for credit losses Allowance for loan losses at beginning of period $ 67,826 $ 60,267 $ 8,507 $ 7,194 $ 7,715 $ 1,261 $ 152,770 Other adjustments — (35 ) (20 ) (15 ) 19 — (51 ) Reclassification from allowance for unfunded lending-related commitments — (116 ) — — — — (116 ) Charge-offs (24,658 ) (4,869 ) (2,372 ) (315 ) (9,085 ) (355 ) (41,654 ) Recoveries 974 1,112 313 372 1,853 152 4,776 Provision for credit losses 28,985 8,579 (2,708 ) 2,175 8,864 143 46,038 Allowance for loan losses at period end $ 73,127 $ 64,938 $ 3,720 $ 9,411 $ 9,366 $ 1,201 $ 161,763 Allowance for unfunded lending-related commitments at period end $ — $ 1,510 $ — $ — $ — $ — $ 1,510 Allowance for credit losses at period end $ 73,127 $ 66,448 $ 3,720 $ 9,411 $ 9,366 $ 1,201 $ 163,273 Nine months ended September 30, 2018 Commercial Real Estate Home Equity Residential Real Estate Premium Finance Receivable Consumer and Other Total Loans (In thousands) Commercial Allowance for credit losses Allowance for loan losses at beginning of period $ 57,811 $ 55,227 $ 10,493 $ 6,688 $ 6,846 $ 840 $ 137,905 Other adjustments (3 ) (66 ) (2 ) (19 ) (12 ) — (102 ) Reclassification from allowance for unfunded lending-related commitments — 24 — — — — 24 Charge-offs (8,116 ) (1,176 ) (1,530 ) (1,088 ) (10,487 ) (732 ) (23,129 ) Recoveries 1,232 4,267 436 2,028 2,502 162 10,627 Provision for credit losses 15,821 (29 ) (254 ) (1,318 ) 9,325 886 24,431 Allowance for loan losses at period end $ 66,745 $ 58,247 $ 9,143 $ 6,291 $ 8,174 $ 1,156 $ 149,756 Allowance for unfunded lending-related commitments at period end $ — $ 1,245 $ — $ — $ — $ — $ 1,245 Allowance for credit losses at period end $ 66,745 $ 59,492 $ 9,143 $ 6,291 $ 8,174 $ 1,156 $ 151,001 Impaired Loans A summary of impaired loans, including troubled debt restructurings ("TDRs"), is as follows: September 30, December 31, September 30, (In thousands) 2019 2018 2018 Impaired loans (included in non-performing and TDRs): Impaired loans with an allowance for loan loss required (1) $ 52,485 $ 60,219 $ 83,349 Impaired loans with no allowance for loan loss required 78,338 67,050 49,173 Total impaired loans (2) $ 130,823 $ 127,269 $ 132,522 Allowance for loan losses related to impaired loans $ 14,934 $ 11,437 $ 14,365 TDRs $ 66,308 $ 66,102 $ 66,219 (1) These impaired loans require an allowance for loan losses because the estimated fair value of the loans or related collateral is less than the recorded investment in the loans. (2) Impaired loans are considered by the Company to be non-accrual loans, TDRs or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest. The following tables present impaired loans by loan class for the periods ended as follows: For the Nine Months Ended As of September 30, 2019 September 30, 2019 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (In thousands) Impaired loans with a related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 20,281 $ 20,536 $ 10,606 $ 20,411 $ 1,011 Franchise — — — — — Mortgage warehouse lines of credit — — — — — Asset-based lending 130 130 — 130 6 Leases 1,585 1,585 — 1,651 62 Commercial real estate Construction — — — — — Land — — — — — Office 8,043 8,190 3,470 8,114 283 Industrial — — — — — Retail 5,029 5,029 32 5,076 171 Multi-family 1,168 1,168 25 1,178 39 Mixed use and other 774 821 67 813 30 Home equity 8,374 8,969 313 8,534 251 Residential real estate 6,995 7,261 315 7,061 188 Consumer and other 106 124 106 110 5 Impaired loans with no related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 25,804 $ 30,152 $ — $ 29,361 $ 1,769 Franchise 3,752 10,083 — 11,857 715 Asset-based lending 5,782 6,164 — 5,457 215 Leases 696 733 — 761 36 Commercial real estate Construction 1,030 1,554 — 1,146 65 Land 994 1,303 — 1,184 54 Office 662 679 — 667 31 Industrial 105 218 — 122 9 Retail 7,507 10,993 — 8,307 437 Multi-family 690 797 — 704 23 Mixed use and other 5,926 6,189 — 6,091 275 Home equity 10,328 12,132 — 10,709 465 Residential real estate 14,894 17,309 — 15,259 595 Consumer and other 168 325 — 190 11 Total impaired loans, net of unearned income $ 130,823 $ 152,444 $ 14,934 $ 144,893 $ 6,746 For the Twelve Months Ended As of December 31, 2018 December 31, 2018 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (In thousands) Impaired loans with a related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 16,703 $ 17,029 $ 4,866 $ 17,868 $ 1,181 Franchise 16,021 16,256 1,375 16,221 909 Mortgage warehouse lines of credit — — — — — Asset-based lending 557 557 317 689 50 Leases 1,730 1,730 — 1,812 91 Commercial real estate Construction 1,554 1,554 550 1,554 76 Land — — — — — Office 573 638 21 587 25 Industrial — — — — — Retail 14,633 14,633 3,413 14,694 676 Multi-family — — — — — Mixed use and other 1,188 1,221 293 1,354 66 Home equity 3,133 3,470 282 3,165 131 Residential real estate 4,011 4,263 204 4,056 159 Consumer and other 116 129 116 119 7 Impaired loans with no related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 18,314 $ 21,501 $ — $ 20,547 $ 1,143 Franchise 5,152 5,154 — 5,320 403 Asset-based lending 207 601 — 569 51 Leases 845 879 — 936 56 Commercial real estate Construction 1,117 1,117 — 1,218 52 Land 3,396 3,491 — 3,751 198 Office 3,629 3,642 — 3,651 184 Industrial 322 450 — 363 30 Retail 1,592 1,945 — 1,699 110 Multi-family 1,498 1,595 — 1,529 55 Mixed use and other 3,522 3,836 — 3,611 227 Home equity 9,122 12,383 — 9,323 564 Residential real estate 18,053 20,765 — 18,552 883 Consumer and other 281 407 — 293 20 Total impaired loans, net of unearned income $ 127,269 $ 139,246 $ 11,437 $ 133,481 $ 7,347 For the Nine Months Ended As of September 30, 2018 September 30, 2018 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (In thousands) Impaired loans with a related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 36,564 $ 36,699 $ 8,242 $ 30,259 $ 1,404 Franchise 16,316 18,504 1,638 18,387 771 Asset-based lending 646 646 283 724 39 Leases 1,777 1,777 1 1,836 69 Commercial real estate Construction 1,554 1,554 390 1,554 56 Land 1,375 1,375 1 1,508 53 Office 579 647 26 591 19 Industrial 45 154 1 56 6 Retail 15,325 15,567 2,413 15,376 535 Multi-family 1,197 1,197 8 1,209 32 Mixed use and other 1,590 1,801 309 1,754 76 Home equity 2,287 2,651 611 2,303 78 Residential real estate 3,977 4,291 325 3,998 128 Consumer and other 117 130 117 119 5 Impaired loans with no related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 5,758 $ 7,022 $ — $ 9,325 $ 465 Franchise 5,157 5,158 — 5,376 302 Asset-based lending 264 1,088 — 1,623 89 Leases 899 930 — 974 43 Commercial real estate Construction 1,117 1,117 — 1,252 40 Land 2,325 2,431 — 2,366 98 Office 1,532 2,077 — 1,541 86 Industrial 178 195 — 188 9 Retail 777 946 — 874 42 Multi-family 318 412 — 329 9 Mixed use and other 3,763 4,362 — 3,950 194 Home equity 8,997 12,131 — 9,015 462 Residential real estate 17,804 20,291 — 18,193 643 Consumer and other 284 408 — 295 15 Total impaired loans, net of unearned income $ 132,522 $ 145,561 $ 14,365 $ 134,975 $ 5,768 TDRs At September 30, 2019 , the Company had $66.3 million in loans modified in TDRs. The $66.3 million in TDRs represents 230 credits in which economic concessions were granted to certain borrowers to better align the terms of their loans with their current ability to pay. The Company’s approach to restructuring loans, excluding PCI loans, is built on its credit risk rating system which requires credit management personnel to assign a credit risk rating to each loan. In each case, the loan officer is responsible for recommending a credit risk rating for each loan and ensuring the credit risk ratings are appropriate. These credit risk ratings are then reviewed and approved by the bank’s chief credit officer and/or concurrence credit officer. Credit risk ratings are determined by evaluating a number of factors including a borrower’s financial strength, cash flow coverage, collateral protection and guarantees. The Company’s credit risk rating scale is one through ten with higher scores indicating higher risk. In the case of loans rated six or worse following modification, the Company’s Managed Assets Division evaluates the loan and the credit risk rating and determines that the loan has been restructured to be reasonably assured of repayment and of performance according to the modified terms and is supported by a current, well-documented credit assessment of the borrower’s financial condition and prospects for repayment under the revised terms. A modification of a loan, excluding PCI loans, with an existing credit risk rating of 6 or worse or a modification of any other credit, which will result in a restructured credit risk rating of six or worse, must be reviewed for possible TDR classification. In that event, our Managed Assets Division conducts an overall credit and collateral review. A modification of these loans is considered to be a TDR if both (1) the borrower is experiencing financial difficulty and (2) for economic or legal reasons, the bank grants a concession to a borrower that it would not otherwise consider. The modification of a loan, excluding PCI loans, where the credit risk rating is 5 or better both before and after such modification is not considered to be a TDR. Based on the Company’s credit risk rating system, it considers that borrowers whose credit risk rating is 5 or better are not experiencing financial difficulties and therefore, are not considered TDRs. All credits determined to be a TDR will continue to be classified as a TDR in all subsequent periods, unless the borrower has been in compliance with the loan’s modified terms for a period of six months (including over a calendar year-end) and the current interest rate represents a market rate at the time of restructuring. The Managed Assets Division, in consultation with the respective loan officer, determines whether the modified interest rate represented a current market rate at the time of restructuring. Using knowledge of current market conditions and rates, competitive pricing on recent loan originations, and an assessment of various characteristics of the modified loan (including collateral position and payment history), an appropriate market rate for a new borrower with similar risk is determined. If the modified interest rate meets or exceeds this market rate for a new borrower with similar risk, the modified interest rate represents a market rate at the time of restructuring. Additionally, before removing a loan from TDR classification, a review of the current or previously measured impairment on the loan and any concerns related to future performance by the borrower is conducted. If concerns exist about the future ability of the borrower to meet its obligations under the loans based on a credit review by the Managed Assets Division, the TDR classification is not removed from the loan. TDRs are reviewed at the time of the modification and on a quarterly basis to determine if a specific reserve is necessary. The carrying amount of the loan is compared to the expected payments to be received, discounted at the loan's original rate, or for collateral dependent loans, to the fair value of the collateral. Any shortfall is recorded as a specific reserve. The Company, in accordance with ASC 310-10, continues to individually measure impairment of these loans after the TDR classification is removed. Each TDR was reviewed for impairment at September 30, 2019 and approximately $5.9 million of impairment was present and appropriately reserved for through the Company’s normal reserving methodology in the Company’s allowance for loan losses. TDRs may arise when, due to financial difficulties experienced by the borrower, the Company obtains through physical possession one or more collateral assets in satisfaction of all or part of an existing credit. Once possession is obtained, the Company reclassifies the appropriate portion of the remaining balance of the credit from loans to OREO, which is included within other assets in the Consolidated Statements of Condition. For any residential real estate property collateralizing a consumer mortgage loan, the Company is considered to possess the related collateral only if legal title is obtained upon completion of foreclosure, or the borrower conveys all interest in the residential real estate property to the Company through completion of a deed in lieu of foreclosure or similar legal agreement. At September 30, 2019 , the Company had $2.5 million of foreclosed residential real estate properties included within OREO. Furthermore, the recorded investment in residential mortgage loans secured by residential real estate properties for which foreclosure proceedings are in process totaled $12.6 million and $14.2 million at September 30, 2019 and 2018 , respectively. The tables below present a summary of the post-modification balance of loans restructured during the three and nine months ended September 30, 2019 and 2018 , respectively, which represent TDRs: Three months ended September 30, 2019 (Dollars in thousands) Total (1)(2) Extension at Below Market (2) Reduction of Interest Rate (2) Modification to Interest-only Payments (2) Forgiveness of Debt (2) Count Balance Count Balance Count Balance Count Balance Count Balance Commercial Commercial, industrial and other 5 $ 3,526 2 $ 2,721 — $ — 3 $ 807 — $ — Commercial real estate Office 1 5,070 1 5,070 — — 1 5,070 — — Mixed use and other 2 122 1 122 — — 1 121 — — Residential real estate and other 60 4,879 59 4,568 9 1,048 1 311 — — Total loans 68 $ 13,597 63 $ 12,481 9 $ 1,048 6 $ 6,309 — $ — Three months ended September 30, 2018 (Dollars in thousands) Total (1)(2) Extension at Below Market Terms (2) Reduction of Interest Rate (2) Modification to Interest-only Payments (2) Forgiveness of Debt (2) Count Balance Count Balance Count Balance Count Balance Count Balance Commercial Commercial, industrial and other 1 $ 519 1 $ 519 — $ — — $ — — $ — Franchise 1 35 1 35 — — — — — — Leases — — — — — — — — — — Commercial real estate Mixed use and other — — — — — — — — — — Residential real estate and other 20 3,679 20 3,679 7 621 — — — — Total loans 22 $ 4,233 22 $ 4,233 7 $ 621 — $ — — $ — (1) TDRs may have more than one modification representing a concession. As such, TDRs during the period may be represented in more than one of the categories noted above. (2) Balances represent the recorded investment in the loan at the time of the restructuring. During the three months ended September 30, 2019 , 68 loans totaling $13.6 million were determined to be TDRs, compared to 22 loans totaling $4.2 million during the three months ended September 30, 2018 . Of these loans extended at below market terms, the weighted average extension had a term of approximately 13 months during the quarter ended September 30, 2019 compared to 72 months for the quarter ended September 30, 2018 . Further, the weighted average decrease in the stated interest rate for loans with a reduction of interest rate during the period was approximately 161 basis points and 140 basis points during the three months ended September 30, 2019 and 2018 , respectively. Interest-only payment terms were approximately nine months during the three months ended September 30, 2019 . Additionally, no principal balances were forgiven in the third quarter of 2019 and 2018. Nine months ended September 30, 2019 Total (1)(2) Extension at (2) Reduction of Interest (2) Modification to (2) Forgiveness of Debt (2) Count Balance Count Balance Count Balance Count Balance Count Balance Commercial Commercial, industrial and other 18 $ 24,835 8 $ 5,608 1 $ 550 12 $ 20,723 — $ — Asset based lending 1 76 1 76 — — — — — — Commercial real estate Office 2 5,382 2 5,382 — — 1 5,070 — — Mixed use and other 4 1,385 3 1,083 — — 2 423 — — Residential real estate and other 102 15,126 101 14,815 24 4,537 1 311 — — Total loans 127 $ 46,804 115 $ 26,964 25 $ 5,087 16 $ 26,527 — $ — Nine months ended September 30, 2018 (Dollars in thousands) Total (1)(2) Extension at (2) Reduction of Interest (2) Modification to (2) Forgiveness of Debt (2) Count Balance Count Balance Count Balance Count Balance Count Balance Commercial Commercial, industrial and other 4 $ 13,442 3 $ 692 — $ — 1 $ 12,750 — $ — Franchise 3 5,157 1 35 — — 2 5,122 — — Leases 1 239 1 239 — — — — — — Commercial real estate Office 1 59 1 59 — — — — — — Mixed use and other 1 85 1 85 1 85 — — — — Residential real estate and other 31 5,846 31 5,846 12 1,417 — — — — Total loans 41 $ 24,828 38 $ 6,956 13 $ 1,502 3 $ 17,872 — $ — (1) TDRs may have more than one modification representing a concession. As such, TDRs during the period may be represented in more than one of the categories noted above. (2) Balances represent the recorded investment in the loan at the time of the restructuring. During the nine months ended September 30, 2019 , 127 loans totaling $46.8 million were determined to be TDRs, compa

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets A summary of the Company’s goodwill assets by business segment is presented in the following table: (Dollars in thousands) January 1, 2019 Goodwill Acquired Impairment Loss Goodwill Adjustments September 30, Community banking $ 465,085 $ 10,726 $ — $ 123 $ 475,934 Specialty finance 38,343 — — 665 39,008 Wealth management 69,713 — — (340 ) 69,373 Total $ 573,141 $ 10,726 $ — $ 448 $ 584,315 The community banking segment's goodwill increased $10.8 million in the first nine months of 2019 primarily as a result the acquisition of ROC. The specialty finance segment's goodwill increased $665,000 in the first nine months of 2019 as a result of foreign currency translation adjustments related to the Canadian acquisitions. Wealth management's goodwill decreased $340,000 in the first nine months of 2019 as a result of the subsequent measurement period adjustments related to the acquisition of CDEC. At June 30, 2019, the Company utilized a qualitative approach for its annual goodwill impairment test of the community banking segment and determined that it is not more likely than not that an impairment existed at that time. At December 31, 2018, the Company utilized a quantitative approach for its annual goodwill impairment tests of the specialty finance and wealth management segments and determined that no impairment existed at that time. At each reporting date between annual goodwill impairment tests, the Company considers potential indicators of impairment. As of September 30, 2019 , the Company identified no such indicators of goodwill impairment within the community banking, specialty finance and wealth management segments. A summary of intangible assets as of the dates shown and the expected amortization of finite-lived intangible assets as of September 30, 2019 is as follows: (Dollars in thousands) September 30, December 31, September 30, Community banking segment: Core deposit intangibles with finite lives: Gross carrying amount $ 48,791 $ 55,366 $ 44,395 Accumulated amortization (24,628 ) (29,406 ) (28,142 ) Net carrying amount $ 24,163 $ 25,960 $ 16,253 Trademark with indefinite lives: Carrying amount 5,800 5,800 5,800 Total net carrying amount $ 29,963 $ 31,760 $ 22,053 Specialty finance segment: Customer list intangibles with finite lives: Gross carrying amount $ 1,962 $ 1,958 $ 1,967 Accumulated amortization (1,526 ) (1,436 ) (1,407 ) Net carrying amount $ 436 $ 522 $ 560 Wealth management segment: Customer list and other intangibles with finite lives: Gross carrying amount $ 20,430 $ 20,430 $ 7,940 Accumulated amortization (7,172 ) (3,288 ) (3,175 ) Net carrying amount $ 13,258 $ 17,142 $ 4,765 Total intangible assets: Gross carrying amount $ 76,983 $ 83,554 $ 60,102 Accumulated amortization (33,326 ) (34,130 ) (32,724 ) Total intangible assets, net $ 43,657 $ 49,424 $ 27,378 Estimated amortization Actual in nine months ended September 30, 2019 $ 8,828 Estimated remaining in 2019 2,844 Estimated—2020 10,105 Estimated—2021 6,852 Estimated—2022 5,368 Estimated—2023 3,977 The core deposit intangibles recognized in connection with prior bank acquisitions are amortized over a ten -year period on an accelerated basis. The customer list intangibles recognized in connection with the purchase of life insurance premium finance assets in 2009 are being amortized over an 18 -year period on an accelerated basis. The customer list and other intangibles recognized in connection with prior acquisitions within the wealth management segment are being amortized over a period of up to ten years on a straight-line basis. Indefinite-lived intangible assets consist of certain trade and domain names recognized in connection with the Veterans First acquisition. As indefinite-lived intangible assets are not amortized, the Company assesses impairment on at least an annual basis. Total amortization expense associated with finite-lived intangibles totaled approximately $8.8 million and $3.2 million for the nine months ended September 30, 2019 and 2018 , respectively.

Mortgage Servicing Rights ("MSR

Mortgage Servicing Rights ("MSRs")	9 Months Ended
	Sep. 30, 2019
Disclosures Pertaining to Servicing Assets and Servicing Liabilities [Abstract]
Mortgage Servicing Rights (MSRs)	Mortgage Servicing Rights (“MSRs”) The following is a summary of the changes in the carrying value of MSRs, accounted for at fair value, for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, September 30, September 30, (In thousands) 2019 2018 2019 2018 Balance at beginning of the period $ 72,850 $ 63,194 $ 75,183 $ 33,676 Additions from loans sold with servicing retained 14,029 11,340 30,411 23,388 Additions from acquisitions — — 407 13,806 Estimate of changes in fair value due to: Payoffs and paydowns (7,236 ) (1,081 ) (13,309 ) (3,647 ) Changes in valuation inputs or assumptions (4,058 ) 1,077 (17,107 ) 7,307 Fair value at end of the period $ 75,585 $ 74,530 $ 75,585 $ 74,530 Unpaid principal balance of mortgage loans serviced for others $ 7,901,045 $ 5,904,300 The Company recognizes MSR assets upon the sale of residential real estate loans to external third parties when it retains the obligation to service the loans and the servicing fee is more than adequate compensation. The initial recognition of MSR assets from loans sold with servicing retained and subsequent changes in fair value of all MSRs are recognized in mortgage banking revenue. MSRs are subject to changes in value from actual and expected prepayment of the underlying loans. Starting in 2019, the Company periodically purchased options for the right to purchase securities not currently held within the banks' investment portfolios. These option transactions are designed primarily to economically hedge a portion of the potential negative fair value adjustments related to MSRs. The Company did not specifically hedge the value of its MSRs during the third quarter of 2018. For more information regarding the hedges in 2019, see Note 15 - Derivative Financial Instruments in Item 1 of this report.

Deposits

Deposits	9 Months Ended
	Sep. 30, 2019
Deposits [Abstract]
Deposits	Deposits The following table is a summary of deposits as of the dates shown: (Dollars in thousands) September 30, December 31, September 30, Balance: Non-interest bearing $ 7,067,960 $ 6,569,880 $ 6,399,213 NOW and interest bearing demand deposits 2,966,098 2,897,133 2,512,259 Wealth management deposits 2,795,838 2,996,764 2,520,120 Money market 7,326,899 5,704,866 5,429,921 Savings 2,934,348 2,665,194 2,595,164 Time certificates of deposit 5,619,236 5,260,841 5,460,038 Total deposits $ 28,710,379 $ 26,094,678 $ 24,916,715 Mix: Non-interest bearing 25 % 25 % 26 % NOW and interest bearing demand deposits 10 11 10 Wealth management deposits 10 12 10 Money market 25 22 22 Savings 10 10 10 Time certificates of deposit 20 20 22 Total deposits 100 % 100 % 100 % Wealth management deposits represent deposit balances (primarily money market accounts) at the Company’s subsidiary banks from brokerage customers of Wintrust Investments, LLC ("Wintrust Investments"), CDEC, trust and asset management customers of the Company and brokerage customers from unaffiliated companies.

FHLB Advances, Other Borrowings

FHLB Advances, Other Borrowings and Subordinated Notes	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
FHLB Advances, Other Borrowings and Subordinated Notes	FHLB Advances, Other Borrowings and Subordinated Notes The following table is a summary of FHLB advances, other borrowings and subordinated notes as of the dates shown: (In thousands) September 30, December 31, September 30, FHLB advances $ 574,847 $ 426,326 $ 615,000 Other borrowings: Notes payable 128,433 144,461 149,799 Short-term borrowings 9,677 50,593 17,431 Other 46,774 47,722 48,043 Secured borrowings 225,604 151,079 158,298 Total other borrowings 410,488 393,855 373,571 Subordinated notes 435,979 139,210 139,172 Total FHLB advances, other borrowings and subordinated notes $ 1,421,314 $ 959,391 $ 1,127,743 FHLB Advances FHLB advances consist of obligations of the banks and are collateralized by qualifying commercial and residential real estate and home equity loans and certain securities. FHLB advances are stated at par value of the debt adjusted for unamortized prepayment fees paid at the time of prior restructurings of FHLB advances and unamortized fair value adjustments recorded in connection with advances acquired through acquisitions and debt issuance costs. Notes Payable On September 18, 2018, the Company established a $150.0 million term facility ("Term Facility"), which is part of a $200.0 million loan agreement ("Credit Agreement") with unaffiliated banks. The Credit Agreement consists of the Term Facility with an original outstanding balance of $150.0 million and a $50.0 million revolving credit facility ("Revolving Credit Facility"). At September 30, 2019, the Company had a notes payable balance of $128.4 million under the Term Facility. The Term Facility is stated at par of the current outstanding balance of the debt adjusted for unamortized costs paid by the Company in relation to the debt issuance. The Company was contractually required to borrow the entire amount of the Term Facility on September 18, 2018 and all such borrowings must be repaid by September 18, 2023. Beginning December 31, 2018, the Company is required to make quarterly payments of principal plus interest on the Term Facility. During the second quarter of 2019, the Company borrowed $35.0 million under the Revolving Credit Facility and paid off such amount prior to June 30, 2019. At September 30, 2019, the Company had no outstanding balance under the Revolving Credit Facility. Unamortized costs paid by the Company in relation to the issuance of the Revolving Credit Facility are classified in other assets on the Consolidated Statements of Condition. Borrowings under the Credit Agreement that are considered “Base Rate Loans” bear interest at a rate equal to the sum of (1) 50 basis points (in the case of a borrowing under the Revolving Credit Facility) or 75 basis points (in the case of a borrowing under the Term Facility) plus (2) the highest of (a) the federal funds rate plus 50 basis points , (b) the lender's prime rate, and (c) the Eurodollar Rate (as defined below) that would be applicable for an interest period of one month plus 100 basis points . Borrowings under the agreement that are considered “Eurodollar Rate Loans” bear interest at a rate equal to the sum of (1) 125 basis points (in the case of a borrowing under the Revolving Credit Facility) or 125 basis points (in the case of a borrowing under the Term Facility) plus (2) the LIBOR rate for the applicable period, as adjusted for statutory reserve requirements for eurocurrency liabilities (the “Eurodollar Rate”). A commitment fee is payable quarterly equal to 0.20% of the actual daily amount by which the lenders' commitment under the Revolving Credit Facility exceeded the amount outstanding under such facility. Borrowings under the Credit Agreement are secured by pledges of and first priority perfected security interests in the Company's equity interest in its bank subsidiaries and contain several restrictive covenants, including the maintenance of various capital adequacy levels, asset quality and profitability ratios, and certain restrictions on dividends and other indebtedness. At September 30, 2019 , the Company was in compliance with all such covenants. The Revolving Credit Facility and the Term Facility are available to be utilized, as needed, to provide capital to fund continued growth at the Company’s banks and to serve as an interim source of funds for acquisitions, common stock repurchases or other general corporate purposes. In connection with the establishment of the Credit Agreement, all outstanding notes payable under a $150.0 million loan agreement with unaffiliated banks dated December 15, 2014 (as subsequently amended) were paid in full. This loan agreement consisted of a term facility with an original outstanding balance of $75.0 million and a $75.0 million revolving credit facility. Short-term Borrowings Short-term borrowings include securities sold under repurchase agreements and federal funds purchased. These borrowings totaled $9.7 million at September 30, 2019 compared to $50.6 million at December 31, 2018 and $17.4 million at September 30, 2018 . At September 30, 2019 , December 31, 2018 and September 30, 2018 , securities sold under repurchase agreements represent $9.7 million , $50.6 million and $17.4 million , respectively, of customer sweep accounts in connection with master repurchase agreements at the banks. The Company records securities sold under repurchase agreements at their gross value and does not offset positions on the Consolidated Statements of Condition. As of September 30, 2019 , the Company had pledged securities related to its customer balances in sweep accounts of $20.3 million . Securities pledged for customer balances in sweep accounts and short-term borrowings from brokers are maintained under the Company’s control and consist of U.S. Government agency and mortgage-backed securities. These securities are included in the available-for-sale and held-to-maturity securities portfolios as reflected on the Company’s Consolidated Statements of Condition. The following is a summary of these securities pledged as of September 30, 2019 disaggregated by investment category and maturity of the related customer sweep account, and reconciled to the outstanding balance of securities sold under repurchase agreements: (In thousands) Overnight Sweep Collateral Available-for-sale securities pledged Mortgage-backed securities $ 4,431 Collateralized mortgage obligations 2,847 Held-to-maturity securities pledged U.S. Government agencies 13,000 Total collateral pledged $ 20,278 Excess collateral 10,601 Securities sold under repurchase agreements $ 9,677 Other Borrowings Other borrowings at September 30, 2019 represent a fixed-rate promissory note issued by the Company in June 2017 ("Fixed-Rate Promissory Note") related to and secured by two office buildings owned by the Company. At September 30, 2019 , the Fixed-Rate Promissory Note had a balance of $46.8 million compared to $47.7 million at December 31, 2018 and $48.0 million at September 30, 2018 . Under the Fixed-Rate Promissory Note, the Company will make monthly principal payments and pay interest at a fixed rate of 3.36% until maturity on June 30, 2022 . The Fixed-Rate Promissory Note contains several restrictive covenants, including the maintenance of various capital adequacy levels, asset quality and profitability ratios, and certain restrictions on dividends and indebtedness. At September 30, 2019 , the Company was in compliance with all such covenants. Secured Borrowings Secured borrowings at September 30, 2019 primarily represents transactions to sell an undivided co-ownership interest in all receivables owed to the Company's subsidiary, First Insurance Funding of Canada ("FIFC Canada"). In December 2014, FIFC Canada sold such interest to an unrelated third party in exchange for a cash payment of approximately C$150 million pursuant to a receivables purchase agreement (“Receivables Purchase Agreement”). The Receivables Purchase Agreement was amended in December 2015, effectively extending the maturity date from December 15, 2015 to December 15, 2017 . Additionally, at that time, the unrelated third party paid an additional C$10 million , which increased the total payments to C$160 million . The Receivables Purchase Agreement was again amended in December 2017, effectively extending the maturity date from December 15, 2017 to December 16, 2019. Additionally, in December 2017, the unrelated third party paid an additional C$10 million , which increased the total payments to C$170 million . In June 2018, the unrelated third party paid an additional C$20 million , which increased the total payments to C$190 million . The Receivables Purchase Agreement was again amended in February 2019, effectively extending the maturity date from December 16, 2019 to December 15, 2020. Additionally, in February 2019, the unrelated third party paid an additional C$20 million , which increased the total payments to C$210 million . In May 2019, the unrelated third party paid an additional C$70 million , which increased the total payments to C$280 million . These transactions were not considered sales of receivables and, as such, related proceeds received are reflected on the Company’s Consolidated Statements of Condition as a secured borrowing owed to the unrelated third party, net of unamortized debt issuance costs, and translated to the Company’s reporting currency as of the respective date. At September 30, 2019 , the translated balance of the secured borrowing totaled $211.4 million compared to $139.3 million at December 31, 2018 and $147.2 million at September 30, 2018 . Additionally, the interest rate under the Receivables Purchase Agreement at September 30, 2019 was 2.6808% . The remaining $14.2 million within secured borrowings at September 30, 2019 represents other sold interests in certain loans by the Company that were not considered sales and, as such, related proceeds received are reflected on the Company’s Consolidated Statements of Condition as a secured borrowing owed to the various unrelated third parties. Subordinated Notes At September 30, 2019 , the Company had outstanding subordinated notes totaling $436.0 million compared to $139.2 million and $139.2 million outstanding at December 31, 2018 and September 30, 2018 , respectively. During the second quarter of 2019, the Company issued $300.0 million of subordinated notes, receiving $296.7 million in net proceeds. The notes have a stated interest rate of 4.85% and mature in June 2029. Additionally, at September 30, 2019, the Company had $139.3 million outstanding on previously issued subordinated debt. These notes have a stated interest rate of 5.00% and mature in June 2024 . Subordinated notes are stated at par adjusted for unamortized issuance costs paid related to such debt.

Junior Subordinated Debentures

Junior Subordinated Debentures	9 Months Ended
	Sep. 30, 2019
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [Abstract]
Junior Subordinated Debentures	Junior Subordinated Debentures As of September 30, 2019 , the Company owned 100% of the common securities of eleven trusts, Wintrust Capital Trust III, Wintrust Statutory Trust IV, Wintrust Statutory Trust V, Wintrust Capital Trust VII, Wintrust Capital Trust VIII, Wintrust Capital Trust IX, Northview Capital Trust I, Town Bankshares Capital Trust I, First Northwest Capital Trust I, Suburban Illinois Capital Trust II, and Community Financial Shares Statutory Trust II (the “Trusts”) set up to provide long-term financing. The Northview, Town, First Northwest, Suburban, and Community Financial Shares capital trusts were acquired as part of the acquisitions of Northview Financial Corporation, Town Bankshares, Ltd., First Northwest Bancorp, Inc., Suburban and CFIS, respectively. The Trusts were formed for purposes of issuing trust preferred securities to third-party investors and investing the proceeds from the issuance of the trust preferred securities and common securities solely in junior subordinated debentures issued by the Company (or assumed by the Company in connection with an acquisition), with the same maturities and interest rates as the trust preferred securities. The junior subordinated debentures are the sole assets of the Trusts. In each Trust, the common securities represent approximately 3% of the junior subordinated debentures and the trust preferred securities represent approximately 97% of the junior subordinated debentures. The Trusts are reported in the Company’s consolidated financial statements as unconsolidated subsidiaries. Accordingly, in the Consolidated Statements of Condition, the junior subordinated debentures issued by the Company to the Trusts are reported as liabilities and the common securities of the Trusts, all of which are owned by the Company, are included in investment securities. The following table provides a summary of the Company’s junior subordinated debentures as of September 30, 2019 . The junior subordinated debentures represent the par value of the obligations owed to the Trusts. (Dollars in thousands) Common Securities Trust Preferred Securities Junior Subordinated Debentures Rate Structure Contractual rate at 9/30/2019 Issue Date Maturity Date Earliest Redemption Date Wintrust Capital Trust III $ 774 $ 25,000 $ 25,774 L+3.25 5.55 % 04/2003 04/2033 04/2008 Wintrust Statutory Trust IV 619 20,000 20,619 L+2.80 4.90 % 12/2003 12/2033 12/2008 Wintrust Statutory Trust V 1,238 40,000 41,238 L+2.60 4.70 % 05/2004 05/2034 06/2009 Wintrust Capital Trust VII 1,550 50,000 51,550 L+1.95 4.07 % 12/2004 03/2035 03/2010 Wintrust Capital Trust VIII 1,238 25,000 26,238 L+1.45 3.55 % 08/2005 09/2035 09/2010 Wintrust Capital Trust IX 1,547 50,000 51,547 L+1.63 3.75 % 09/2006 09/2036 09/2011 Northview Capital Trust I 186 6,000 6,186 L+3.00 5.25 % 08/2003 11/2033 08/2008 Town Bankshares Capital Trust I 186 6,000 6,186 L+3.00 5.25 % 08/2003 11/2033 08/2008 First Northwest Capital Trust I 155 5,000 5,155 L+3.00 5.10 % 05/2004 05/2034 05/2009 Suburban Illinois Capital Trust II 464 15,000 15,464 L+1.75 3.87 % 12/2006 12/2036 12/2011 Community Financial Shares Statutory Trust II 109 3,500 3,609 L+1.62 3.74 % 06/2007 09/2037 06/2012 Total $ 253,566 4.33 % The junior subordinated debentures totaled $253.6 million at September 30, 2019 , December 31, 2018 and September 30, 2018 . The interest rates on the variable rate junior subordinated debentures are based on the three-month LIBOR rate and reset on a quarterly basis. At September 30, 2019 , the weighted average contractual interest rate on the junior subordinated debentures was 4.33% . The Company entered into interest rate swaps with an aggregate notional value of $210.0 million to hedge the variable cash flows on certain junior subordinated debentures. The hedge-adjusted contractual interest rate on the junior subordinated debentures as of September 30, 2019 , was 4.52% . Distributions on the common and preferred securities issued by the Trusts are payable quarterly at a rate per annum equal to the interest rates being earned by the Trusts on the junior subordinated debentures. Interest expense on the junior subordinated debentures is deductible for income tax purposes. The Company has guaranteed the payment of distributions and payments upon liquidation or redemption of the trust preferred securities, in each case to the extent of funds held by the Trusts. The Company and the Trusts believe that, taken together, the obligations of the Company under the guarantees, the junior subordinated debentures, and other related agreements provide, in the aggregate, a full, irrevocable and unconditional guarantee, on a subordinated basis, of all of the obligations of the Trusts under the trust preferred securities. Subject to certain limitations, the Company has the right to defer the payment of interest on the junior subordinated debentures at any time, or from time to time, for a period not to exceed 20 consecutive quarters. The trust preferred securities are subject to mandatory redemption, in whole or in part, upon repayment of the junior subordinated debentures at maturity or their earlier redemption. The junior subordinated debentures are redeemable in whole or in part prior to maturity at any time after the earliest redemption dates shown in the table, and earlier at the discretion of the Company if certain conditions are met, and, in any event, only after the Company has obtained Federal Reserve Bank ("FRB") approval, if then required under applicable guidelines or regulations. At September 30, 2019 , the Company included $245.5 million of the junior subordinated debentures, net of common securities, in Tier 2 regulatory capital.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers Disaggregation of Revenue The following table presents revenue from contracts with customers, disaggregated by the revenue source: (Dollars in thousands) Three Months Ended Nine Months Ended Revenue from contracts with customers Location in income statement September 30, September 30, September 30, September 30, Brokerage and insurance product commissions Wealth management $ 4,686 $ 5,579 $ 13,966 $ 17,394 Trust Wealth management 4,399 3,003 14,366 9,646 Asset management Wealth management 14,914 14,052 43,783 41,197 Total wealth management 23,999 22,634 72,115 68,237 Mortgage broker fees Mortgage banking 235 295 608 862 Service charges on deposit accounts Service charges on deposit accounts 9,972 9,331 28,097 27,339 Administrative services Other non-interest income 1,086 1,099 3,125 3,365 Card related fees Other non-interest income 2,220 2,328 6,932 5,583 Other deposit related fees Other non-interest income 3,322 3,035 9,404 8,927 Total revenue from contracts with customers $ 40,834 $ 38,722 $ 120,281 $ 114,313 Wealth Management Revenue Wealth management revenue is comprised of brokerage and insurance product commissions, managed money fees and trust and asset management revenue of the Company's four wealth management subsidiaries: Wintrust Investments, Great Lakes Advisors, LLC ("GLA"), The Chicago Trust Company, N.A. ("CTC") and CDEC. All wealth management revenue is recognized in the wealth management segment. Brokerage and insurance product commissions consists primarily of commissions earned from trade execution services on behalf of customers and from selling mutual funds, insurance and other investment products to customers. For trade execution services, the Company recognizes commissions and receives payment from the brokerage customers at the point of transaction execution. Commissions received from the investment or insurance product providers are recognized at the point of sale of the product. The Company also receives trail and other commissions from providers for certain plans. These are generally based on qualifying account values and are recognized once the performance obligation, specific to each provider, is satisfied on a monthly, quarterly or annual basis. Trust revenue is earned primarily from trust and custody services that are generally performed over time as well as fees earned on funds held during the facilitation of tax-deferred like-kind exchange transactions. Revenue is determined periodically based on a schedule of fees applied to the value of each customer account using a time-elapsed method to measure progress toward complete satisfaction of the performance obligation. Fees are typically billed on a calendar month or quarter basis in advance or in arrears depending upon the contract. Upfront fees received related to the facilitation of tax-deferred like-kind exchange transactions are deferred until the transaction is completed. Additional fees earned for certain extraordinary services performed on behalf of the customers are recognized when the service has been performed. Asset management revenue is earned from money management and advisory services that are performed over time. Revenue is based primarily on the market value of assets under management or administration using a time-elapsed method to measure progress toward complete satisfaction of the performance obligation. Fees are typically billed on a calendar month or quarter basis in advance or in arrears depending upon the contract. Certain programs provide the customer with an option of paying fees as a percentage of the account value or incurring commission charges for each trade similar to brokerage and insurance product commissions. Trade commissions and any other fees received for additional services are recognized at a point in time once the performance obligation is satisfied. Mortgage Broker Fees For customers desiring a mortgage product not currently offered by the Company, the Company may refer such customers and, with permission, direct such customers' applications to certain third party mortgage brokers. Mortgage broker fees are received from these brokers for such customer referrals upon settlement of the underlying mortgage. The Company's entitlement to the consideration is contingent on the settlement of the mortgage which is highly susceptible to factors outside of the Company's influence, such as third party broker's underwriting requirements. Also, the uncertainty surrounding the consideration could be resolved in varying lengths of time, dependent upon the third party brokers. Therefore, mortgage broker fees are recognized at the settlement of the underlying mortgage when the consideration is received. Broker fees are recognized in the community banking segment. Service Charges on Deposit Accounts Service charges on deposit accounts include fees charged to deposit customers for various services, including account analysis services, and are based on factors such as the size and type of customer, type of product and number of transactions. The fees are based on a standard schedule of fees and, depending on the nature of the service performed, the service is performed at a point in time or over a period of a month. When the service is performed at a point in time, the Company recognizes and receives revenue when the service has been performed. When the service is performed over a period of a month, the Company recognizes and receives revenue in the month the service has been performed. Service charges on deposit accounts are recognized in the community banking segment. Administrative Services Administrative services revenue is earned from providing outsourced administrative services, such as data processing of payrolls, billing and cash management services, to temporary staffing service clients located throughout the United States. Fees are charged periodically (typically a payroll cycle) and computed in accordance with the contractually determined rate applied to the total gross billings administered for the period. The revenue is recognized over the period using a time-elapsed method to measure progress toward complete satisfaction of the performance obligation. Other fees are charged on a per occurrence basis as the service is provided in the billing cycle. The Company has certain contracts with customers to perform outsourced administrative services and short-term accounts receivable financing. For these contracts, the total fee is allocated between the administrative services revenue and interest income during the client onboarding process based on the specific client and services provided. Administrative services revenue is recognized in the specialty finance segment. Card and Other Deposit Related Fees Card related fees include interchange and merchant revenue, and fees related to debit and credit cards. Interchange revenue is related to the Company issued debit cards. Other deposit related fees primarily include pay by phone processing fees, ATM and safe deposit box fees, check order charges and foreign currency related fees. Card and deposit related fees are generally based on volume of transactions and are recognized at the point in time when the service has been performed. For any consideration that is constrained, the revenue is recognized once the uncertainty is known. Upfront fees received from certain contracts are recognized on a straight line basis over the term of the contract. Card and deposit related fees are recognized in the community banking segment. Contract Balances The following table provides information about contract assets, contract liabilities and receivables from contracts with customers: (Dollars in thousands) September 30, December 31, September 30, Contract assets $ — $ — $ — Contract liabilities $ 1,429 $ 1,727 $ 1,429 Mortgage broker fees receivable $ 23 $ 44 $ 9 Administrative services receivable 222 275 2,425 Wealth management receivable 9,285 13,610 7,779 Card related fees receivable 114 — — Total receivables from contracts with customer $ 9,644 $ 13,929 $ 10,213 Contract liabilities represent upfront fees that the Company received at inception of certain contracts. The revenue recognized that was included in the contract liability balance at beginning of the period totaled $667,000 and $278,000 for the nine months ended September 30, 2019 and 2018 , respectively. Receivables are recognized in the period the Company provides services when the Company's right to consideration is unconditional. Card related fee receivable is the result of volume based fee that the Company receives from a customer on an annual basis in the second quarter of each year. Payment terms on other invoiced amounts are typically 30 days or less. Contract liabilities and receivables from contracts with customers are included within the accrued interest payable and other liabilities and accrued interest receivable and other assets line items, respectively, in the Consolidated Statements of Condition. Transaction price allocated to the remaining performance obligations For contracts with an original expected length of more than one year, the following table presents the estimated future timing of recognition of upfront fees related to card and deposit related fees. These upfront fees represent performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period. (Dollars in thousands) Estimated remaining in 2019 $ 277 Estimated—2020 553 Estimated—2021 303 Estimated—2022 153 Estimated—2023 143 Estimated—2024 — Total $ 1,429 Practical Expedients and Exemptions The Company does not adjust the promised amount of consideration for the effects of a significant financing component if the Company expects, at contract inception, that the period between when the Company transfers a promised service to a customer and when the customer pays for that services is one year or less. The Company recognizes the incremental costs of obtaining a contract as an expense when incurred if the amortization period of the asset that the entity otherwise would have recognized is one year or less.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Segment Information	Segment Information The Company’s operations consist of three primary segments: community banking, specialty finance and wealth management. The three reportable segments are strategic business units that are separately managed as they offer different products and services and have different marketing strategies. In addition, each segment’s customer base has varying characteristics and each segment has a different regulatory environment. While the Company’s management monitors each of the fifteen bank subsidiaries’ operations and profitability separately, these subsidiaries have been aggregated into one reportable operating segment due to the similarities in products and services, customer base, operations, profitability measures, and economic characteristics. For purposes of internal segment profitability, management allocates certain intersegment and parent company balances. Management allocates a portion of revenues to the specialty finance segment related to loans and leases originated by the specialty finance segment and sold or assigned to the community banking segment. Similarly, for purposes of analyzing the contribution from the wealth management segment, management allocates a portion of the net interest income earned by the community banking segment on deposit balances of customers of the wealth management segment to the wealth management segment. See Note 10 — Deposits, for more information on these deposits. Finally, expenses incurred at the Wintrust parent company are allocated to each segment based on each segment's risk-weighted assets. The segment financial information provided in the following tables has been derived from the internal profitability reporting system used by management to monitor and manage the financial performance of the Company. The accounting policies of the segments are substantially similar to those described in “Summary of Significant Accounting Policies” in Note 1 of the Company’s 2018 Form 10-K. The Company evaluates segment performance based on after-tax profit or loss and other appropriate profitability measures common to each segment. The following is a summary of certain operating information for reportable segments: Three months ended $ Change in Contribution % Change in Contribution (Dollars in thousands) September 30, September 30, Net interest income: Community Banking $ 209,912 $ 202,435 $ 7,477 4 % Specialty Finance 42,138 36,398 5,740 16 Wealth Management 7,290 4,048 3,242 80 Total Operating Segments 259,340 242,881 16,459 7 Intersegment Eliminations 5,512 4,682 830 18 Consolidated net interest income $ 264,852 $ 247,563 $ 17,289 7 % Non-interest income: Community Banking $ 82,870 $ 69,776 $ 13,094 19 % Specialty Finance 20,003 16,963 3,040 18 Wealth Management 24,422 23,535 887 4 Total Operating Segments 127,295 110,274 17,021 15 Intersegment Eliminations (12,158 ) (10,344 ) (1,814 ) (18 ) Consolidated non-interest income $ 115,137 $ 99,930 $ 15,207 15 % Net revenue: Community Banking $ 292,782 $ 272,211 $ 20,571 8 % Specialty Finance 62,141 53,361 8,780 16 Wealth Management 31,712 27,583 4,129 15 Total Operating Segments 386,635 353,155 33,480 9 Intersegment Eliminations (6,646 ) (5,662 ) (984 ) (17 ) Consolidated net revenue $ 379,989 $ 347,493 $ 32,496 9 % Segment profit: Community Banking $ 68,792 $ 63,735 $ 5,057 8 % Specialty Finance 24,241 22,971 1,270 6 Wealth Management 6,088 5,242 846 16 Consolidated net income $ 99,121 $ 91,948 $ 7,173 8 % Segment assets: Community Banking $ 28,092,785 $ 24,590,027 $ 3,502,758 14 % Specialty Finance 5,739,798 4,897,664 842,134 17 Wealth Management 1,079,319 655,040 424,279 65 Consolidated total assets $ 34,911,902 $ 30,142,731 $ 4,769,171 16 % Nine months ended $ Change in Contribution % Change in Contribution (Dollars in thousands) September 30, September 30, Net interest income: Community Banking $ 635,645 $ 583,926 $ 51,719 9 % Specialty Finance 119,241 100,104 19,137 19 Wealth Management 21,728 12,729 8,999 71 Total Operating Segments 776,614 696,759 79,855 11 Intersegment Eliminations 16,426 14,056 2,370 17 Consolidated net interest income $ 793,040 $ 710,815 $ 82,225 12 % Non-interest income: Community Banking $ 196,507 $ 192,028 $ 4,479 2 % Specialty Finance 59,188 49,005 10,183 21 Wealth Management 74,407 69,789 4,618 7 Total Operating Segments 330,102 310,822 19,280 6 Intersegment Eliminations (35,150 ) (29,980 ) (5,170 ) (17 ) Consolidated non-interest income $ 294,952 $ 280,842 $ 14,110 5 % Net revenue: Community Banking $ 832,152 $ 775,954 $ 56,198 7 % Specialty Finance 178,429 149,109 29,320 20 Wealth Management 96,135 82,518 13,617 17 Total Operating Segments 1,106,716 1,007,581 99,135 10 Intersegment Eliminations (18,724 ) (15,924 ) (2,800 ) (18 ) Consolidated net revenue $ 1,087,992 $ 991,657 $ 96,335 10 % Segment profit: Community Banking $ 182,553 $ 187,395 $ (4,842 ) (3 )% Specialty Finance 67,218 61,482 5,736 9 Wealth Management 19,962 14,632 5,330 36 Consolidated net income $ 269,733 $ 263,509 $ 6,224 2 %

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The Company primarily enters into derivative financial instruments as part of its strategy to manage its exposure to changes in interest rates. Derivative instruments represent contracts between parties that result in one party delivering cash to the other party based on a notional amount and an underlying term (such as a rate, security price or price index) as specified in the contract. The amount of cash delivered from one party to the other is determined based on the interaction of the notional amount of the contract with the underlying term. Derivatives are also implicit in certain contracts and commitments. The derivative financial instruments currently used by the Company to manage its exposure to interest rate risk include: (1) interest rate swaps and collars to manage the interest rate risk of certain fixed and variable rate assets and variable rate liabilities; (2) interest rate lock commitments provided to customers to fund certain mortgage loans to be sold into the secondary market; (3) forward commitments for the future delivery of such mortgage loans to protect the Company from adverse changes in interest rates and corresponding changes in the value of mortgage loans held-for-sale; (4) covered call options to economically hedge specific investment securities and receive fee income effectively enhancing the overall yield on such securities to compensate for net interest margin compression; and (5) options to economically hedge a portion of the potential negative fair value adjustments related to the Company's mortgage servicing rights portfolio. The Company also enters into derivatives (typically interest rate swaps) with certain qualified borrowers to facilitate the borrowers’ risk management strategies and concurrently enters into mirror-image derivatives with a third party counterparty, effectively making a market in the derivatives for such borrowers. Additionally, the Company enters into foreign currency contracts to manage foreign exchange risk associated with certain foreign currency denominated assets. The Company recognizes derivative financial instruments in the consolidated financial statements at fair value regardless of the purpose or intent for holding the instrument. The Company records derivative assets and derivative liabilities on the Consolidated Statements of Condition within accrued interest receivable and other assets and accrued interest payable and other liabilities, respectively. Changes in the fair value of derivative financial instruments are either recognized in income or in shareholders’ equity as a component of accumulated other comprehensive income or loss depending on whether the derivative financial instrument qualifies for hedge accounting and, if so, whether it qualifies as a fair value hedge or cash flow hedge. Changes in fair values of derivatives accounted for as fair value hedges are recorded in income in the same period and in the same income statement line as changes in the fair values of the hedged items that relate to the hedged risk(s). Changes in fair values of derivative financial instruments accounted for as cash flow hedges are recorded as a component of accumulated other comprehensive income or loss, net of deferred taxes, and reclassified to earnings when the hedged transaction affects earnings. Changes in fair values of derivative financial instruments not designated in a hedging relationship pursuant to ASC 815 are reported in non-interest income during the period of the change. Derivative financial instruments are valued by a third party and are corroborated by comparison with valuations provided by the respective counterparties. Fair values of certain mortgage banking derivatives (interest rate lock commitments and forward commitments to sell mortgage loans) are estimated based on changes in mortgage interest rates from the date of the loan commitment. The fair value of foreign currency derivatives is computed based on changes in foreign currency rates stated in the contract compared to those prevailing at the measurement date. The table below presents the fair value of the Company’s derivative financial instruments as of September 30, 2019 , December 31, 2018 and September 30, 2018 : Derivative Assets Derivative Liabilities (In thousands) September 30, December 31, September 30, September 30, December 31, September 30, Derivatives designated as hedging instruments under ASC 815: Interest rate derivatives designated as Cash Flow Hedges $ — $ 6,270 $ 16,271 $ 25,895 $ 1,656 $ — Interest rate derivatives designated as Fair Value Hedges 256 2,636 5,126 8,839 1,756 — Total derivatives designated as hedging instruments under ASC 815 $ 256 $ 8,906 $ 21,397 $ 34,734 $ 3,412 $ — Derivatives not designated as hedging instruments under ASC 815: Interest rate derivatives $ 134,130 $ 59,519 $ 69,865 $ 134,163 $ 59,159 $ 69,342 Interest rate lock commitments 3,373 3,405 4,128 148 2,694 — Forward commitments to sell mortgage loans 176 — 12 1,658 1,486 1,330 Foreign exchange contracts 351 1,342 751 306 1,337 709 Total derivatives not designated as hedging instruments under ASC 815 $ 138,030 $ 64,266 $ 74,756 $ 136,275 $ 64,676 $ 71,381 Total Derivatives $ 138,286 $ 73,172 $ 96,153 $ 171,009 $ 68,088 $ 71,381 Cash Flow Hedges of Interest Rate Risk The Company’s objectives in using interest rate derivatives are to add stability to net interest income and to manage its exposure to interest rate movements. To accomplish these objectives, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without the exchange of the underlying notional amount. Interest rate collars designated as cash flow hedges involve the receipt of amounts in which the interest rate specified in the contract exceeds the agreed upon cap strike price or the payment of amounts in which the interest rate specified in the contract is below the agreed upon floor strike price at the end of each period. As of September 30, 2019 , the Company had fifteen interest rate swap derivatives designated as cash flow hedges of variable rate deposits and certain junior subordinated debentures, and one interest rate collar derivative designated as a cash flow hedge of the Company's variable rate Term Facility. When the relationship between the hedged item and hedging instrument is highly effective at achieving offsetting changes in cash flows attributable to the hedged risk, changes in the fair value of these cash flow hedges are recorded in accumulated other comprehensive income or loss and are subsequently reclassified to interest expense as interest payments are made on such variable rate deposits. The changes in fair value (net of tax) are separately disclosed in the Consolidated Statements of Comprehensive Income. The table below provides details on these cash flow hedges, summarized by derivative type and maturity, as of September 30, 2019 : September 30, 2019 (In thousands) Notional Fair Value Maturity Date Amount Asset (Liability) Interest Rate Swaps: October 2021 $ 25,000 $ (386 ) November 2021 20,000 (334 ) December 2021 165,000 (2,841 ) May 2022 370,000 (6,628 ) June 2022 160,000 (2,796 ) July 2022 230,000 (4,027 ) August 2022 235,000 (4,196 ) Interest Rate Collars: September 2023 128,571 (4,687 ) Total Cash Flow Hedges $ 1,333,571 $ (25,895 ) A rollforward of the amounts in accumulated other comprehensive income or loss related to interest rate derivatives designated as cash flow hedges follows: Three Months Ended Nine Months Ended (In thousands) September 30, September 30, September 30, September 30, Unrealized (loss) gain at beginning of period $ (16,422 ) $ 16,059 $ 10,742 $ 11,902 Amount reclassified from accumulated other comprehensive income to interest expense on deposits and other borrowings (2,428 ) (2,319 ) (10,071 ) (4,338 ) Amount of (loss) gain recognized in other comprehensive income (4,420 ) 2,531 (23,941 ) 8,707 Unrealized (loss) gain at end of period $ (23,270 ) $ 16,271 $ (23,270 ) $ 16,271 As of September 30, 2019 , the Company estimates that during the next twelve months $3.2 million will be reclassified from accumulated other comprehensive income or loss as an increase to interest expense. Fair Value Hedges of Interest Rate Risk Interest rate swaps designated as fair value hedges involve the payment of fixed amounts to a counterparty in exchange for the Company receiving variable payments over the life of the agreements without the exchange of the underlying notional amount. As of September 30, 2019 , the Company has fifteen interest rate swaps with an aggregate notional amount of $158.1 million that were designated as fair value hedges primarily associated with fixed rate commercial and industrial and commercial real estate loans as well as life insurance premium finance receivables. One of these interest rate swaps with an aggregate notional amount of $6.9 million has terms starting after September 30, 2019 . For derivatives designated and that qualify as fair value hedges, the net gain or loss from the entire change in the fair value of the derivative instrument is recognized in the same income statement line item as the earnings effect, including the net gain or loss, of the hedged item (interest income earned on fixed rate loans) when the hedged item affects earnings. The following table presents the carrying amount of the hedged assets/(liabilities) and the cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities) that are designated as a fair value hedge accounting relationship as of September 30, 2019 : September 30, 2019 (In thousands) Derivatives in Fair Value Hedging Relationships Location in the Statement of Condition Carrying Amount of the Hedged Assets/(Liabilities) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) Cumulative Amount of Fair Value Hedging Adjustment Remaining for any Hedged Assets (Liabilities) for which Hedge Accounting has been Discontinued Interest rate swaps Loans, net of unearned income $ 165,226 $ 8,458 $ — Available-for-sale debt securities 1,442 101 — The following table presents the loss or gain recognized related to derivative instruments that are designated as fair value hedges for the respective period: (In thousands) Derivatives in Fair Value Hedging Relationships Location of (Loss)/Gain Recognized in Income on Derivative Three Months Ended Nine Months Ended September 30, 2019 September 30, 2019 Interest rate swaps Interest and fees on loans $ (2 ) $ (42 ) Interest income - investment securities — — Non-Designated Hedges The Company does not use derivatives for speculative purposes. Derivatives not designated as accounting hedges are used to manage the Company’s economic exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of ASC 815. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings. Interest Rate Derivatives —The Company has interest rate derivatives, including swaps and option products, resulting from a service the Company provides to certain qualified borrowers. The Company’s banking subsidiaries execute certain derivative products (typically interest rate swaps) directly with qualified commercial borrowers to facilitate their respective risk management strategies. For example, these arrangements allow the Company’s commercial borrowers to effectively convert a variable rate loan to a fixed rate. In order to minimize the Company’s exposure on these transactions, the Company simultaneously executes offsetting derivatives with third parties. In most cases, the offsetting derivatives have mirror-image terms, which result in the positions’ changes in fair value substantially offsetting through earnings each period. However, to the extent that the derivatives are not a mirror-image and because of differences in counterparty credit risk, changes in fair value will not completely offset resulting in some earnings impact each period. Changes in the fair value of these derivatives are included in other non-interest income. At September 30, 2019 , the Company had interest rate derivative transactions with an aggregate notional amount of approximately $7.2 billion (all interest rate swaps and caps with customers and third parties) related to this program. These interest rate derivatives had maturity dates ranging from October 2019 to February 2045 . Mortgage Banking 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 a portion of our residential mortgage loan production 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’s mortgage banking derivatives have not been designated as being in hedge relationships. At September 30, 2019 , the Company had forward commitments to sell mortgage loans with an aggregate notional amount of approximately $904.4 million and interest rate lock commitments with an aggregate notional amount of approximately $525.7 million . The fair values of these derivatives were estimated based on changes in mortgage rates from the dates of the commitments. Changes in the fair value of these mortgage banking derivatives are included in mortgage banking revenue. Foreign Currency Derivatives— These derivatives include foreign currency contracts used to manage the foreign exchange risk associated with foreign currency denominated assets and transactions. Foreign currency contracts, which include spot and forward contracts, represent agreements to exchange the currency of one country for the currency of another country at an agreed-upon price on an agreed-upon settlement date. As a result of fluctuations in foreign currencies, the U.S. dollar-equivalent value of the foreign currency denominated assets or forecasted transactions increase or decrease. Gains or losses on the derivative instruments related to these foreign currency denominated assets or forecasted transactions are expected to substantially offset this variability. As of September 30, 2019 , the Company held foreign currency derivatives with an aggregate notional amount of approximately $38.9 million . Other Derivatives— Periodically, the Company will sell options to a bank or dealer for the right to purchase certain securities held within the banks’ investment portfolios (covered call options). These option transactions are designed primarily to mitigate overall interest rate risk and to increase the total return associated with the investment securities portfolio. These options do not qualify as accounting hedges pursuant to ASC 815, and, accordingly, changes in fair value of these contracts are recognized as other non-interest income. There were no covered call options outstanding as of September 30, 2019 , December 31, 2018 or September 30, 2018 . Periodically, the Company will purchase options for the right to purchase securities not currently held within the banks' investment portfolios. These option transactions are designed primarily to economically hedge a portion of the potential negative fair value adjustments related to its mortgage servicing rights portfolio. The gain or loss associated with these derivative contracts are included in mortgage banking revenue. There were no such options outstanding as of September 30, 2019 . Amounts included in the Consolidated Statements of Income related to derivative instruments not designated in hedge relationships were as follows: (In thousands) Three Months Ended Nine Months Ended Derivative Location in income statement September 30, September 30, September 30, September 30, Interest rate swaps and caps Trading (losses) gains, net $ (75 ) $ (55 ) $ (392 ) $ 89 Mortgage banking derivatives Mortgage banking revenue 1,026 (1,122 ) 1,089 858 Foreign exchange contracts Trading (losses) gains, net 54 (18 ) 72 51 Covered call options Fees from covered call options — 627 2,427 2,893 Derivative contract held as economic hedge on MSRs Mortgage banking revenue 82 — 1,002 — Credit Risk Derivative instruments have inherent risks, primarily market risk and credit risk. Market risk is associated with changes in interest rates and credit risk relates to the risk that the counterparty will fail to perform according to the terms of the agreement. The amounts potentially subject to market and credit risks are the streams of interest payments under the contracts and the market value of the derivative instrument and not the notional principal amounts used to express the volume of the transactions. Market and credit risks are managed and monitored as part of the Company's overall asset-liability management process, except that the credit risk related to derivatives entered into with certain qualified borrowers is managed through the Company's standard loan underwriting process since these derivatives are secured through collateral provided by the loan agreements. Actual exposures are monitored against various types of credit limits established to contain risk within parameters. When deemed necessary, appropriate types and amounts of collateral are obtained to minimize credit exposure. The Company has agreements with certain of its interest rate derivative counterparties that contain cross-default provisions, which provide that if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations. The Company also has agreements with certain of its derivative counterparties that contain a provision allowing the counterparty to terminate the derivative positions if the Company fails to maintain its status as a well or adequately capitalized institution, which would require the Company to settle its obligations under the agreements. As of September 30, 2019 , the fair value of interest rate derivatives in a net liability position that were subject to such agreements, which includes accrued interest related to these agreements, was $164.9 million . If the Company had breached any of these provisions and the derivatives were terminated as a result, the Company would have been required to settle its obligations under the agreements at the termination value and would have been required to pay any additional amounts due in excess of amounts previously posted as collateral with the respective counterparty. The Company is also exposed to the credit risk of its commercial borrowers who are counterparties to interest rate derivatives with the banks. This counterparty risk related to the commercial borrowers is managed and monitored through the banks' standard underwriting process applicable to loans since these derivatives are secured through collateral provided by the loan agreement. The counterparty risk associated with the mirror-image swaps executed with third parties is monitored and managed in connection with the Company's overall asset liability management process. The Company records interest rate derivatives subject to master netting agreements at their gross value and does not offset derivative assets and liabilities on the Consolidated Statements of Condition. The tables below summarize the Company's interest rate derivatives and offsetting positions as of the dates shown. Derivative Assets Derivative Liabilities Fair Value Fair Value (In thousands) September 30, December 31, September 30, September 30, December 31, September 30, Gross Amounts Recognized $ 134,386 $ 68,425 $ 91,262 $ 168,897 $ 62,571 $ 69,342 Less: Amounts offset in the Statements of Financial Condition — — — — — — Net amount presented in the Statements of Financial Condition $ 134,386 $ 68,425 $ 91,262 $ 168,897 $ 62,571 $ 69,342 Gross amounts not offset in the Statements of Financial Condition Offsetting Derivative Positions (1,572 ) (28,124 ) (7,887 ) (1,572 ) (28,124 ) (7,887 ) Collateral Posted — (23,810 ) (76,530 ) (167,325 ) (2,640 ) (340 ) Net Credit Exposure $ 132,814 $ 16,491 $ 6,845 $ — $ 31,807 $ 61,115

Fair Values of Assets and Liabi

Fair Values of Assets and Liabilities	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Values of Assets and Liabilities	Fair Values of Assets and Liabilities The Company measures, monitors and discloses certain of its assets and liabilities on a fair value basis. These financial assets and financial liabilities are measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the observability of the inputs used to determine fair value. These levels are: • Level 1—unadjusted quoted prices in active markets for identical assets or liabilities. • Level 2 — inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability or inputs that are derived principally from or corroborated by observable market data by correlation or other means. • Level 3—significant unobservable inputs that reflect the Company’s own assumptions that market participants would use in pricing the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. A financial instrument’s categorization within the above valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the assets or liabilities. The following is a description of the valuation methodologies used for the Company’s assets and liabilities measured at fair value on a recurring basis. Available-for-sale debt securities, trading account securities and equity securities with readily determinable fair value —Fair values for available-for-sale debt securities, trading account securities and equity securities with readily determinable fair value are typically based on prices obtained from independent pricing vendors. Securities measured with these valuation techniques are generally classified as Level 2 of the fair value hierarchy. Typically, standard inputs such as benchmark yields, reported trades for similar securities, issuer spreads, benchmark securities, bids, offers and reference data including market research publications are used to fair value these securities. When these inputs are not available, broker/dealer quotes may be obtained by the vendor to determine the fair value of the security. We review the vendor’s pricing methodologies to determine if observable market information is being used, versus unobservable inputs. Fair value measurements using significant inputs that are unobservable in the market due to limited activity or a less liquid market are classified as Level 3 in the fair value hierarchy. The fair value of U.S. Treasury securities and certain equity securities with readily determinable fair value are based on unadjusted quoted prices in active markets for identical securities. As such, these securities are classified as Level 1 in the fair value hierarchy. The Company’s Investment Operations Department is responsible for the valuation of Level 3 available-for-sale debt securities. The methodology and variables used as inputs in pricing Level 3 securities are derived from a combination of observable and unobservable inputs. The unobservable inputs are determined through internal assumptions that may vary from period to period due to external factors, such as market movement and credit rating adjustments. At September 30, 2019 , the Company classified $113.1 million of municipal securities as Level 3. These municipal securities are bond issues for various municipal government entities primarily located in the Chicago metropolitan area and southern Wisconsin and are privately placed, non-rated bonds without CUSIP numbers. The Company also classified $2.8 million of U.S. Government agencies as Level 3 at September 30, 2019 . The Company’s methodology for pricing these securities focuses on three distinct inputs: equivalent rating, yield and other pricing terms. To determine the rating for a given non-rated municipal bond, the Investment Operations Department references a rated, publicly issued bond by the same issuer if available. A reduction is then applied to the rating obtained from the comparable bond, as the Company believes if liquidated, a non-rated bond would be valued less than a similar bond with a verifiable rating. The reduction applied by the Company is one complete rating grade (i.e. a “AA” rating for a comparable bond would be reduced to “A” for the Company’s valuation). For bond issues without comparable bond proxies, a rating of "BBB" was assigned. In the third quarter of 2019 , all of the ratings derived by the Investment Operations Department using the above process were "BBB" or better. The fair value measurement of municipal bonds is sensitive to the rating input, as a higher rating typically results in an increased valuation. The remaining pricing inputs used in the bond valuation are observable. Based on the rating determined in the above process, Investment Operations obtains a corresponding current market yield curve available to market participants. Other terms including coupon, maturity date, redemption price, number of coupon payments per year, and accrual method are obtained from the individual bond term sheets. Certain municipal bonds held by the Company at September 30, 2019 are continuously callable. When valuing these bonds, the fair value is capped at par value as the Company assumes a market participant would not pay more than par for a continuously callable bond. To determine the rating for the U.S. Government agency securities, the Investment Operations Department assigned a AAA rating as it is guaranteed by the U.S. government. Mortgage loans held-for-sale —The fair value of mortgage loans held-for-sale is determined by reference to investor price sheets for loan products with similar characteristics. As such, these loans are classified as Level 2 in the fair value hierarchy. Loans held-for-investment —The fair value for loans in which the Company elected the fair value option is estimated by discounting future scheduled cash flows for the specific loan through maturity, adjusted for estimated credit losses and prepayments. The Company uses a discount rate based on the actual coupon rate of the underlying loan. At September 30, 2019 , the Company classified $10.0 million of loans held-for-investment as Level 3. The weighted average discount rate used as an input to value these loans at September 30, 2019 was 3.36% with discount rates applied ranging from 3% - 4% . The higher the rate utilized to discount estimated future cash flows, the lower the fair value measurement. As noted above, the fair value estimate also includes assumptions of prepayment speeds and credit losses. The Company included a prepayments speed assumption of 15.03% at September 30, 2019 . Prepayment speeds are inversely related to the fair value of these loans as an increase in prepayment speeds results in a decreased valuation. Additionally, the weighted average credit discount used as an input to value the specific loans was 1.35% with credit loss discount ranging from 0% - 7% at September 30, 2019 . MSRs —Fair value for MSRs is determined utilizing a valuation model which calculates the fair value of each servicing rights based on the present value of estimated future cash flows. The Company uses a discount rate commensurate with the risk associated with each servicing rights, given current market conditions. At September 30, 2019 , the Company classified $75.6 million of MSRs as Level 3. The weighted average discount rate used as an input to value the pool of MSRs at September 30, 2019 was 9.96% with discount rates applied ranging from 9% - 19% . The higher the rate utilized to discount estimated future cash flows, the lower the fair value measurement. The fair value of MSRs was also estimated based on other assumptions including prepayment speeds and the cost to service. Prepayment speeds used as an input to value the MSRs at September 30, 2019 ranged from 0% - 93% or a weighted average prepayment speed of 15.03% . Further, for current and delinquent loans, the Company assumed a weighted average cost of servicing of $77 and $399 , respectively, per loan. Prepayment speeds and the cost to service are both inversely related to the fair value of MSRs as an increase in prepayment speeds or the cost to service results in a decreased valuation. See Note 9 - Mortgage Servicing Rights (“MSRs”) for further discussion of MSRs. Derivative instruments —The Company’s derivative instruments include interest rate swaps, caps and collars, commitments to fund mortgages for sale into the secondary market (interest rate locks), forward commitments to end investors for the sale of mortgage loans and foreign currency contracts. Interest rate swaps, caps and collars are valued by a third party, using models that primarily use market observable inputs, such as yield curves, and are classified as Level 2 in the fair value hierarchy. The credit risk associated with derivative financial instruments that are subject to master netting agreements is measured on a net basis by counterparty portfolio. The fair value for mortgage-related derivatives is based on changes in mortgage rates from the date of the commitments. The fair value of foreign currency derivatives is computed based on change in foreign currency rates stated in the contract compared to those prevailing at the measurement date. At September 30, 2019 , the Company classified $3.0 million of derivative assets related to interest rate locks as Level 3. The fair value of interest rate locks is based on prices obtained for loans with similar characteristics from third parties, adjusted for the pull-through rate, which represents the Company’s best estimate of the likelihood that a committed loan will ultimately fund. The weighted-average pull-through rate at September 30, 2019 was 75.00% with pull-through rates applied ranging from 0% to 100% . Pull-through rates are directly related to the fair value of interest rate locks as an increase in the pull-through rate results in an increased valuation. Nonqualified deferred compensation assets —The underlying assets relating to the nonqualified deferred compensation plan are included in a trust and primarily consist of non-exchange traded institutional funds which are priced based by an independent third party service. These assets are classified as Level 2 in the fair value hierarchy. The following tables present the balances of assets and liabilities measured at fair value on a recurring basis for the periods presented: September 30, 2019 (Dollars in thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 221,670 $ 221,670 $ — $ — U.S. Government agencies 225,459 — 222,648 2,811 Municipal 146,104 — 33,046 113,058 Corporate notes 94,004 — 94,004 — Mortgage-backed 1,582,822 — 1,582,822 — Trading account securities 3,204 — 3,204 — Equity securities with readily determinable fair value 46,086 38,020 8,066 — Mortgage loans held-for-sale 464,727 — 464,727 — Loans held-for-investment 116,022 — 106,023 9,999 MSRs 75,585 — — 75,585 Nonqualified deferred compensation assets 13,750 — 13,750 — Derivative assets 138,286 — 135,307 2,979 Total $ 3,127,719 $ 259,690 $ 2,663,597 $ 204,432 Derivative liabilities $ 171,009 $ — $ 171,009 $ — December 31, 2018 (Dollars in thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 126,404 $ 126,404 $ — $ — U.S. Government agencies 140,307 — 137,157 3,150 Municipal 138,490 — 29,564 108,926 Corporate notes 91,045 — 91,045 — Mortgage-backed 1,629,835 — 1,629,835 — Trading account securities 1,692 — 1,692 — Equity securities with readily determinable fair value 34,717 — 34,717 — Mortgage loans held-for-sale 264,070 — 264,070 — Loans held-for-investment 93,857 — 82,510 11,347 MSRs 75,183 — — 75,183 Nonqualified deferred compensation assets 11,282 — 11,282 — Derivative assets 73,172 — 70,715 2,457 Total $ 2,680,054 $ 126,404 $ 2,352,587 $ 201,063 Derivative liabilities $ 68,088 $ — $ 68,088 $ — September 30, 2018 (Dollars in thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 124,761 $ — $ 124,761 $ — U.S. Government agencies 111,020 — 107,705 3,315 Municipal 133,373 — 35,787 97,586 Corporate notes 93,453 — 93,453 — Mortgage-backed 1,702,378 — 1,702,378 — Trading account securities 688 — 688 — Equity securities with readily determinable fair value 36,414 — 36,414 — Mortgage loans held-for-sale 338,111 — 338,111 — Loans held-for-investment 77,883 — 64,427 13,456 MSRs 74,530 — — 74,530 Nonqualified deferred compensation assets 12,503 — 12,503 — Derivative assets 96,153 — 93,661 2,492 Total $ 2,801,267 $ — $ 2,609,888 $ 191,379 Derivative liabilities $ 71,381 $ — $ 71,381 $ — The aggregate remaining contractual principal balance outstanding as of September 30, 2019 , December 31, 2018 and September 30, 2018 for mortgage loans held-for-sale measured at fair value under ASC 825 was $460.4 million , $253.7 million and $317.4 million , respectively, while the aggregate fair value of mortgage loans held-for-sale was $464.7 million , $264.1 million and $338.1 million , for the same respective periods, as shown in the above tables. There were $1.3 million of loans past due greater than 90 days and still accruing in the mortgage loans held-for-sale portfolio as of September 30, 2019 compared to $1.9 million as of December 31, 2018 and $622,000 as of September 30, 2018 . The changes in Level 3 assets measured at fair value on a recurring basis during the three and nine months ended September 30, 2019 and 2018 are summarized as follows: U.S. Government Agencies Loans held-for- investment Mortgage servicing rights Derivative Assets (Dollars in thousands) Municipal Balance at July 1, 2019 $ 110,296 $ 2,977 $ 10,481 $ 72,850 $ 3,596 Total net gains (losses) included in: Net income (1) — — 86 2,735 (617 ) Other comprehensive income (loss) (1,722 ) (9 ) — — — Purchases 5,668 — — — — Issuances — — — — — Sales — — — — — Settlements (1,184 ) (157 ) (1,203 ) — — Net transfers into/(out of) Level 3 — — 635 — — Balance at September 30, 2019 $ 113,058 $ 2,811 $ 9,999 $ 75,585 $ 2,979 (1) Changes in the balance of MSRs and derivative assets related to fair value adjustments are recorded as components of mortgage banking revenue. Changes in the balance of loans held-for-investment related to fair value adjustments are recorded as other non-interest income. U.S. Government Agencies Loans held-for- investment Mortgage servicing rights Derivative Assets (Dollars in thousands) Municipal Balance at January 1, 2019 $ 108,926 $ 3,150 $ 11,347 $ 75,183 $ 2,457 Total net gains (losses) included in: Net income (1) — — 371 (5 ) 522 Other comprehensive income (loss) 6,334 134 — — — Purchases (2) 7,192 — — 407 — Issuances — — — — — Sales — — — — — Settlements (9,394 ) (473 ) (2,554 ) — — Net transfers into/(out of) Level 3 — — 835 — — Balance at September 30, 2019 $ 113,058 $ 2,811 $ 9,999 $ 75,585 $ 2,979 U.S. Government Agencies Loans held-for- investment Mortgage servicing rights Derivative Assets (Dollars in thousands) Municipal Balance at July 1, 2018 $ 96,566 $ 3,482 $ 13,764 $ 63,194 $ 3,819 Total net gains (losses) included in: Net income (1) — — (32 ) 11,336 (1,327 ) Other comprehensive income (loss) (2,573 ) (9 ) — — — Purchases 4,830 — — — — Issuances — — — — — Sales — — — — — Settlements (1,237 ) (158 ) (1,520 ) — — Net transfers into/(out of) Level 3 — — 1,244 — — Balance at September 30, 2018 $ 97,586 $ 3,315 $ 13,456 $ 74,530 $ 2,492 U.S. Government Agencies Loans held-for- investment Mortgage servicing rights Derivative Assets (Dollars in thousands) Municipal Balance at January 1, 2018 $ 77,181 $ 3,779 $ 33,717 $ 33,676 $ 2,157 Total net gains (losses) included in: Net income (1) — — (1,420 ) 27,048 335 Other comprehensive income (loss) (5,658 ) (306 ) — — — Purchases (2) 31,846 — — 13,806 — Issuances — — — — — Sales — — — — — Settlements (5,783 ) (158 ) (24,177 ) — — Net transfers into/(out of) Level 3 — — 5,336 — — Balance at September 30, 2018 $ 97,586 $ 3,315 $ 13,456 $ 74,530 $ 2,492 (1) Changes in the balance of MSRs and derivative assets related to fair value adjustments are recorded as components of mortgage banking revenue. Changes in the balance of loans held-for-investment related to fair value adjustments are recorded as other non-interest income. (2) Mortgage servicing rights purchased as a part of the ROC and Veterans First business combinations in 2019 and 2018, respectively. See Note 3 - Business Combinations and Asset Acquisitions for further discussion. Also, the Company may be required, from time to time, to measure certain other financial assets at fair value on a nonrecurring basis in accordance with GAAP. These adjustments to fair value usually result from impairment charges on individual assets. For assets measured at fair value on a nonrecurring basis that were still held in the balance sheet at the end of the period, the following table provides the carrying value of the related individual assets or portfolios at September 30, 2019 . September 30, 2019 Three Months Ended September 30, 2019 Fair Value Losses Recognized, net Nine Months Ended September 30, 2019 Fair Value Losses Recognized, net (Dollars in thousands) Total Level 1 Level 2 Level 3 Impaired loans—collateral based $ 91,103 $ — $ — $ 91,103 $ 9,159 $ 32,139 Other real estate owned (1) 17,482 — — 17,482 862 2,468 Total $ 108,585 $ — $ — $ 108,585 $ 10,021 $ 34,607 (1) Fair value losses recognized, net on other real estate owned include valuation adjustments and charge-offs during the respective period. Impaired loans —A loan is considered to be impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due pursuant to the contractual terms of the loan agreement. A loan modified in a TDR is an impaired loan according to applicable accounting guidance. Impairment is measured by estimating the fair value of the loan based on the present value of expected cash flows, the market price of the loan, or the fair value of the underlying collateral. Impaired loans are considered a fair value measurement where an allowance is established based on the fair value of collateral. Appraised values, which may require adjustments to market-based valuation inputs, are generally used on real estate collateral-dependent impaired loans. The Company’s Managed Assets Division is primarily responsible for the valuation of Level 3 inputs of impaired loans. For more information on the Managed Assets Division review of impaired loans refer to Note 7 – Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans. At September 30, 2019 , the Company had $130.8 million of impaired loans classified as Level 3. Of the $130.8 million of impaired loans, $91.1 million were measured at fair value based on the underlying collateral of the loan as shown in the table above. The remaining $39.7 million were valued based on discounted cash flows in accordance with ASC 310. Other real estate owned —Other real estate owned is comprised of real estate acquired in partial or full satisfaction of loans and is included in other assets. Other real estate owned is recorded at its estimated fair value less estimated selling costs at the date of transfer, with any excess of the related loan balance over the fair value less expected selling costs charged to the allowance for loan losses. Subsequent changes in value are reported as adjustments to the carrying amount and are recorded in other non-interest expense. Gains and losses upon sale, if any, are also charged to other non-interest expense. Fair value is generally based on third party appraisals and internal estimates that are adjusted by a discount representing the estimated cost of sale and is therefore considered a Level 3 valuation. The Company’s Managed Assets Division is primarily responsible for the valuation of Level 3 inputs for other real estate owned. At September 30, 2019 , the Company had $17.5 million of other real estate owned classified as Level 3. The unobservable input applied to other real estate owned relates to the 10% reduction to the appraisal value representing the estimated cost of sale of the foreclosed property. A higher discount for the estimated cost of sale results in a decreased carrying value. The valuation techniques and significant unobservable inputs used to measure both recurring and non-recurring Level 3 fair value measurements at September 30, 2019 were as follows: (Dollars in thousands) Fair Value Valuation Methodology Significant Unobservable Input Range of Inputs Weighted Average of Inputs Impact to valuation from an increased or higher input value Measured at fair value on a recurring basis: Municipal Securities $ 113,058 Bond pricing Equivalent rating BBB-AA+ N/A Increase U.S. Government agencies 2,811 Bond pricing Equivalent rating AAA AAA Increase Loans held-for-investment 9,999 Discounted cash flows Discount rate 3%-4% 3.36% Decrease Credit discount 0%-7% 1.35% Decrease Constant prepayment rate (CPR) 15.03% 15.03% Decrease MSRs 75,585 Discounted cash flows Discount rate 9%-19% 9.96% Decrease Constant prepayment rate (CPR) 0%-93% 15.03% Decrease Cost of servicing $70-$200 $77 Decrease Cost of servicing - delinquent $200-$1,000 $399 Decrease Derivatives 2,979 Discounted cash flows Pull-through rate 0%-100% 75% Increase Measured at fair value on a non-recurring basis: Impaired loans—collateral based $ 91,103 Appraisal value Appraisal adjustment - cost of sale 10% 10.00% Decrease Other real estate owned 17,482 Appraisal value Appraisal adjustment - cost of sale 10% 10.00% Decrease The Company is required under applicable accounting guidance to report the fair value of all financial instruments on the Consolidated Statements of Condition, including those financial instruments carried at cost. The table below presents the carrying amounts and estimated fair values of the Company’s financial instruments as of the dates shown: At September 30, 2019 At December 31, 2018 At September 30, 2018 Carrying Fair Carrying Fair Carrying Fair (In thousands) Value Value Value Value Value Value Financial Assets: Cash and cash equivalents $ 448,814 $ 448,814 $ 392,200 $ 392,200 $ 279,993 $ 279,993 Interest bearing deposits with banks 2,260,806 2,260,806 1,099,594 1,099,594 1,137,044 1,137,044 Available-for-sale securities 2,270,059 2,270,059 2,126,081 2,126,081 2,164,985 2,164,985 Held-to-maturity securities 1,095,802 1,104,903 1,067,439 1,036,096 966,438 911,597 Trading account securities 3,204 3,204 1,692 1,692 688 688 Equity securities with readily determinable fair value 46,086 46,086 34,717 34,717 36,414 36,414 FHLB and FRB stock, at cost 92,714 92,714 91,354 91,354 99,998 99,998 Brokerage customer receivables 14,943 14,943 12,609 12,609 15,649 15,649 Mortgage loans held-for-sale, at fair value 464,727 464,727 264,070 264,070 338,111 338,111 Loans held-for-investment, at fair value 116,022 116,022 93,857 93,857 77,883 77,883 Loans held-for-investment, at amortized cost 25,594,149 25,472,310 23,726,834 23,780,739 23,046,068 23,261,545 Nonqualified deferred compensation assets 13,750 13,750 11,282 11,282 12,503 12,503 Derivative assets 138,286 138,286 73,172 73,172 96,153 96,153 Accrued interest receivable and other 272,072 272,072 260,281 260,281 254,879 254,879 Total financial assets $ 32,831,434 $ 32,718,696 $ 29,255,182 $ 29,277,744 $ 28,526,806 $ 28,687,442 Financial Liabilities Non-maturity deposits $ 23,091,143 $ 23,091,143 $ 20,833,837 $ 20,833,837 $ 19,456,677 $ 19,456,677 Deposits with stated maturities 5,619,236 5,635,597 5,260,841 5,283,063 5,460,038 5,475,048 FHLB advances 574,847 620,136 426,326 429,830 615,000 615,342 Other borrowings 410,488 410,488 393,855 393,855 373,571 373,571 Subordinated notes 435,979 451,947 139,210 138,345 139,172 146,838 Junior subordinated debentures 253,566 254,426 253,566 263,846 253,566 258,488 Derivative liabilities 171,009 171,009 68,088 68,088 71,381 71,381 Accrued interest payable 22,899 22,899 16,025 16,025 15,374 15,374 Total financial liabilities $ 30,579,167 $ 30,657,645 $ 27,391,748 $ 27,426,889 $ 26,384,779 $ 26,412,719 Not all the financial instruments listed in the table above are subject to the disclosure provisions of ASC Topic 820, as certain assets and liabilities result in their carrying value approximating fair value. These include cash and cash equivalents, interest bearing deposits with banks, brokerage customer receivables, FHLB and FRB stock, accrued interest receivable and accrued interest payable and non-maturity deposits. The following methods and assumptions were used by the Company in estimating fair values of financial instruments that were not previously disclosed. Held-to-maturity securities. Held-to-maturity securities include U.S. Government-sponsored agency securities and municipal bonds issued by various municipal government entities primarily located in the Chicago metropolitan area and southern Wisconsin. Fair values for held-to-maturity securities are typically based on prices obtained from independent pricing vendors. In accordance with ASC 820, the Company has generally categorized these held-to-maturity securities as a Level 2 fair value measurement. Fair values for certain other held-to-maturity securities are based on the bond pricing methodology discussed previously related to certain available-for-sale securities. In accordance with ASC 820, the Company has categorized these held-to-maturity securities as a Level 3 fair value measurement. Loans held-for-investment, at amortized cost. Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are analyzed by type such as commercial, residential real estate, etc. Each category is further segmented by interest rate type (fixed and variable) and term. For variable-rate loans that reprice frequently, estimated fair values are based on carrying values. The fair value of residential loans is based on secondary market sources for securities backed by similar loans, adjusted for differences in loan characteristics. The fair value for other fixed rate loans is estimated by discounting scheduled cash flows through the estimated maturity using estimated market discount rates that reflect credit and interest rate risks inherent in the loan. Deposits with stated maturities. The fair value of certificates of deposit is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently in effect for deposits of similar remaining maturities. In accordance with ASC 820, the Company has categorized deposits with stated maturities as a Level 3 fair value measurement. FHLB advances. The fair value of FHLB advances is obtained from the FHLB which uses a discounted cash flow analysis based on current market rates of similar maturity debt securities to discount cash flows. In accordance with ASC 820, the Company has categorized FHLB advances as a Level 3 fair value measurement. Subordinated notes. The fair value of the subordinated notes is based on a market price obtained from an independent pricing vendor. In accordance with ASC 820, the Company has categorized subordinated notes as a Level 2 fair value measurement. Junior subordinated debentures. The fair value of the junior subordinated debentures is based on the discounted value of contractual cash flows. In accordance with ASC 820, the Company has categorized junior subordinated debentures as a Level 3 fair value measurement.

Stock-Based Compensation Plans

Stock-Based Compensation Plans	9 Months Ended
	Sep. 30, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]
Stock-Based Compensation Plans	Stock-Based Compensation Plans In May 2015, the Company’s shareholders approved the 2015 Stock Incentive Plan (“the 2015 Plan”) which provides for the issuance of up to 5,485,000 shares of common stock. The 2015 Plan replaced the 2007 Stock Incentive Plan (“the 2007 Plan”) which replaced the 1997 Stock Incentive Plan (“the 1997 Plan”). The 2015 Plan, the 2007 Plan and the 1997 Plan are collectively referred to as “the Plans.” The 2015 Plan has substantially similar terms to the 2007 Plan and the 1997 Plan. Awards granted under the Plans for which common shares are not issued by reason of cancellation, forfeiture, lapse of such award or settlement of such award in cash, are again available under the 2015 Plan. All grants made after the approval of the 2015 Plan are made pursuant to the 2015 Plan. As of September 30, 2019 , approximately 2.8 million shares were available for future grants assuming the maximum number of shares are issued for the performance awards outstanding. The Plans cover substantially all employees of Wintrust. The Compensation Committee of the Board of Directors administers all stock-based compensation programs and authorizes all awards granted pursuant to the Plans. The Plans permit the grant of incentive stock options, non-qualified stock options, stock appreciation rights, stock awards, restricted share or unit awards, performance awards and other incentive awards valued in whole or in part by reference to the Company’s common stock, all on a stand alone, combination or tandem basis. The Company historically awarded stock-based compensation in the form of time-vested non-qualified stock options and time-vested restricted share unit awards (“restricted shares”). The grants of options provide for the purchase of shares of the Company’s common stock at the fair market value of the stock on the date the options are granted. Stock options generally vest ratably over periods of three to five years and have a maximum term of seven years from the date of grant. Restricted shares entitle the holders to receive, at no cost, shares of the Company’s common stock. Restricted shares generally vest over periods of one to five years from the date of grant. Beginning in 2011, the Company has awarded annual grants under the Long-Term Incentive Program (“LTIP”), which is administered under the Plans. The LTIP is designed in part to align the interests of management with the interests of shareholders, foster retention, create a long-term focus based on sustainable results and provide participants with a target long-term incentive opportunity. It is anticipated that LTIP awards will continue to be granted annually. LTIP grants generally consist of a combination of time-vested non-qualified stock options, performance-based stock awards and performance-based cash awards. Performance-based stock and cash awards granted under the LTIP are contingent upon the achievement of pre-established long-term performance goals set in advance by the Compensation Committee over a three -year period starting at the beginning of each calendar year. These performance awards are granted at a target level, and based on the Company’s achievement of the pre-established long-term goals, the actual payouts can range from 0% to a maximum of 150% of the target award. The awards typically vest in the quarter after the end of the performance period upon certification of the payout by the Compensation Committee of the Board of Directors. Holders of performance-based stock awards are entitled to receive, at no cost, the shares earned based on the achievement of the pre-established long-term goals. Holders of restricted share awards and performance-based stock awards received under the Plans are not entitled to vote or receive cash dividends (or cash payments equal to the cash dividends) on the underlying common shares until the awards are vested and issued. Shares that are vested but not issuable pursuant to deferred compensation arrangements accrue additional shares based on the value of dividends otherwise paid. Except in limited circumstances, these awards are canceled upon termination of employment without any payment of consideration by the Company. Stock-based compensation is measured as the fair value of an award on the date of grant, and the measured cost is recognized over the period which the recipient is required to provide service in exchange for the award. The fair values of restricted share and performance-based stock awards are determined based on the average of the high and low trading prices on the grant date, and the fair value of stock options is estimated using a Black-Scholes option-pricing model that utilizes various assumptions. Option-pricing models require the input of highly subjective assumptions and are sensitive to changes in the option's expected life and the price volatility of the underlying stock, which can materially affect the fair value estimate. Management reviews and adjusts the assumptions used to calculate the fair value of an option on a periodic basis to better reflect expected trends. No options were granted since 2016. Stock based compensation is recognized based upon the number of awards that are ultimately expected to vest, taking into account expected forfeitures. In addition, for performance-based awards, an estimate is made of the number of shares expected to vest as a result of actual performance against the performance criteria in the award to determine the amount of compensation expense to recognize. The estimate is reevaluated periodically and total compensation expense is adjusted for any change in estimate in the current period. Stock-based compensation expense recognized in the Consolidated Statements of Income was $2.0 million in the third quarter of 2019 and $3.2 million in the third quarter of 2018 , and $8.3 million and $10.3 million in the year-to-date periods, respectively. A summary of the Company's stock option activity for the nine months ended September 30, 2019 and September 30, 2018 is presented below: Stock Options Common Shares Weighted Average Strike Price Remaining Contractual Term (1) Intrinsic Value (2) ($000) Outstanding at January 1, 2019 795,014 $ 42.26 Granted — — Exercised (112,230 ) 38.64 Forfeited or canceled — — Outstanding at September 30, 2019 682,784 $ 42.85 2.4 $ 14,873 Exercisable at September 30, 2019 667,664 $ 42.81 2.4 $ 14,565 Stock Options Common Shares Weighted Average Strike Price Remaining Contractual Term (1) Intrinsic Value (2) ($000) Outstanding at January 1, 2018 1,084,756 $ 41.98 Granted — — Exercised (271,674 ) 41.36 Forfeited or canceled (6,942 ) 39.81 Outstanding at September 30, 2018 806,140 $ 42.20 3.3 $ 34,452 Exercisable at September 30, 2018 609,752 $ 42.42 3.0 $ 25,924 (1) Represents the remaining weighted average contractual life in years. (2) Aggregate intrinsic value represents the total pre-tax intrinsic value (i.e., the difference between the Company's stock price on the last trading day of the quarter and the option exercise price, multiplied by the number of shares) that would have been received by the option holders if they had exercised their options on the last day of the quarter. Options with exercise prices above the stock price on the last trading day of the quarter are excluded from the calculation of intrinsic value. The intrinsic value will change based on the fair market value of the Company's stock. The aggregate intrinsic value of options exercised during the nine months ended September 30, 2019 and September 30, 2018 , was $3.8 million and $12.9 million , respectively. Cash received from option exercises under the Plan for the nine months ended September 30, 2019 and September 30, 2018 was $4.3 million and $11.2 million , respectively. A summary of the Plans' restricted share activity for the nine months ended September 30, 2019 and September 30, 2018 is presented below: Nine months ended September 30, 2019 Nine months ended September 30, 2018 Restricted Shares Common Weighted Common Weighted Outstanding at January 1 143,263 $ 60.80 127,787 $ 53.33 Granted 13,099 71.66 28,506 87.65 Vested and issued (15,257 ) 76.69 (10,438 ) 56.88 Forfeited or canceled (1,691 ) 79.50 (982 ) 55.39 Outstanding at September 30 139,414 $ 59.85 144,873 $ 59.82 Vested, but not issuable at September 30 91,505 $ 52.13 90,294 $ 51.88 A summary of the Plans' performance-based stock award activity, based on the target level of the awards, for the nine months ended September 30, 2019 and September 30, 2018 is presented below: Nine months ended September 30, 2019 Nine months ended September 30, 2018 Performance-based Stock Common Weighted Common Weighted Outstanding at January 1 396,855 $ 67.71 359,196 $ 54.37 Granted 175,696 71.57 134,326 88.28 Vested and issued (94,288 ) 41.00 (82,307 ) 44.39 Forfeited (10,430 ) 74.70 (13,582 ) 59.18 Outstanding at September 30 467,833 $ 74.38 397,633 $ 67.72 Vested, but deferred at September 30 33,701 $ 42.92 21,477 $ 43.52 The actual number of shares vested and issued in the first nine months of 2019 were 33,950 more than target due to performance achievement above the target level. The Company issues new shares to satisfy its obligation to issue shares granted pursuant to the Plans.

Shareholders' Equity and Earnin

Shareholders' Equity and Earnings Per Share	9 Months Ended
	Sep. 30, 2019
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Shareholders' Equity and Earnings Per Share	Shareholders’ Equity and Earnings Per Share Series D Preferred Stock In June 2015, the Company issued and sold 5,000,000 shares of fixed-to-floating non-cumulative perpetual preferred stock, Series D, liquidation preference $25 per share (the “Series D Preferred Stock”) for $125.0 million in a public offering. When, as and if declared, dividends on the Series D Preferred Stock are payable quarterly in arrears at a fixed rate of 6.50% per annum from the original issuance date to, but excluding, July 15, 2025 , and from (and including) that date at a floating rate equal to three-month LIBOR plus a spread of 4.06% per annum. Common Stock Warrant Pursuant to the U.S. Department of the Treasury’s (the “U.S. Treasury”) Capital Purchase Program, on December 19, 2008, the Company issued to the U.S. Treasury a warrant to exercise 1,643,295 warrant shares of Wintrust common stock with a term of 10 years. In February 2011, the U.S. Treasury sold all of its interest in the warrant issued to it in a secondary underwritten public offering. During 2018 , certain holders of the interest in the warrant exercised 22,952 warrant shares, which resulted in 16,571 shares of common stock issued. On December 19, 2018, the Company’s warrant shares expired. Any warrant shares not exercised prior to this date expired and became void, and the holder did not receive any shares of the Company’s common stock. Other At the January 2019 Board of Directors meeting, a quarterly cash dividend of $0.25 per share ( $1.00 on an annualized basis) was declared. It was paid on February 21, 2019 to shareholders of record as of February 7, 2019 . At the April 2019 Board of Directors meeting, a quarterly cash dividend of $0.25 per share ( $1.00 on an annualized basis) was declared. It was paid on May 23, 2019 to shareholders of record as of May 9, 2019. At the July 2019 Board of Directors meeting, a quarterly cash dividend of $0.25 per share ( $1.00 on an annualized basis) was declared. It was paid on August 22, 2019 to shareholders of record as of August 8, 2019. Accumulated Other Comprehensive Income (Loss) The following tables summarize the components of other comprehensive income (loss), including the related income tax effects, and the related amount reclassified to net income for the periods presented (in thousands). Accumulated Unrealized Losses on Securities Accumulated Unrealized Gains on Derivative Instruments Accumulated Foreign Currency Translation Adjustments Total Accumulated Other Comprehensive Loss Balance at July 1, 2019 $ 4,209 $ (12,044 ) $ (37,594 ) $ (45,429 ) Other comprehensive income (loss) during the period, net of tax, before reclassifications 13,371 (3,233 ) (1,471 ) 8,667 Amount reclassified from accumulated other comprehensive loss into net income, net of tax (292 ) (1,781 ) — (2,073 ) Amount reclassified from accumulated other comprehensive loss related to amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale, net of tax (42 ) — — (42 ) Net other comprehensive income (loss) during the period, net of tax $ 13,037 $ (5,014 ) $ (1,471 ) $ 6,552 Balance at September 30, 2019 $ 17,246 $ (17,058 ) $ (39,065 ) $ (38,877 ) Balance at January 1, 2019 $ (42,353 ) $ 7,857 $ (42,376 ) $ (76,872 ) Other comprehensive income (loss) during the period, net of tax, before reclassifications 60,527 (17,529 ) 3,311 46,309 Amount reclassified from accumulated other comprehensive loss into net income, net of tax (626 ) (7,386 ) — (8,012 ) Amount reclassified from accumulated other comprehensive loss related to amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale, net of tax (302 ) — — (302 ) Net other comprehensive income (loss) during the period, net of tax $ 59,599 $ (24,915 ) $ 3,311 $ 37,995 Balance at September 30, 2019 $ 17,246 $ (17,058 ) $ (39,065 ) $ (38,877 ) Accumulated Unrealized Losses on Securities Accumulated Unrealized Gains on Derivative Instruments Accumulated Foreign Currency Translation Adjustments Total Accumulated Other Comprehensive Loss Balance at July 1, 2018 $ (54,885 ) $ 11,748 $ (38,079 ) $ (81,216 ) Other comprehensive (loss) income during the period, net of tax, before reclassifications (13,277 ) 1,851 1,942 (9,484 ) Amount reclassified from accumulated other comprehensive loss into net income, net of tax (730 ) (1,696 ) — (2,426 ) Amount reclassified from accumulated other comprehensive loss related to amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale, net of tax (24 ) — — (24 ) Net other comprehensive (loss) income during the period, net of tax $ (14,031 ) $ 155 $ 1,942 $ (11,934 ) Balance at September 30, 2018 $ (68,916 ) $ 11,903 $ (36,137 ) $ (93,150 ) Balance at January 1, 2018 $ (15,813 ) $ 7,164 $ (33,186 ) $ (41,835 ) Cumulative effect adjustment from the adoption of: ASU 2016-01 (1,880 ) — — (1,880 ) ASU 2018-02 (4,517 ) 1,543 — (2,974 ) Other comprehensive (loss) income during the period, net of tax, before reclassifications (46,665 ) 6,368 (2,951 ) (43,248 ) Amount reclassified from accumulated other comprehensive loss into net income, net of tax (5 ) (3,172 ) — (3,177 ) Amount reclassified from accumulated other comprehensive loss related to amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale, net of tax (36 ) — — (36 ) Net other comprehensive (loss) income during the period, net of tax $ (46,706 ) $ 3,196 $ (2,951 ) $ (46,461 ) Balance at September 30, 2018 $ (68,916 ) $ 11,903 $ (36,137 ) $ (93,150 ) Amount Reclassified from Accumulated Other Comprehensive Income for the Details Regarding the Component of Accumulated Other Comprehensive Income Three Months Ended Nine Months Ended Impacted Line on the Consolidated Statements of Income September 30, September 30, 2019 2018 2019 2018 Accumulated unrealized gains (losses) on securities Gains included in net income $ 400 $ 1,001 $ 856 $ 6 Gains (losses) on investment securities, net 400 1,001 856 6 Income before taxes Tax effect (108 ) (271 ) (230 ) (1 ) Income tax expense Net of tax $ 292 $ 730 $ 626 $ 5 Net income Accumulated unrealized losses on derivative instruments Amount reclassified to interest expense on deposits $ (2,635 ) $ (2,319 ) $ (10,403 ) $ (4,338 ) Interest on deposits Amount reclassified to interest expense on other borrowings 196 — 321 — Interest on other borrowings Amount reclassified to interest expense on junior subordinated debentures 11 — 11 — Interest on junior subordinated debentures 2,428 2,319 10,071 4,338 Income before taxes Tax effect (647 ) (623 ) (2,685 ) (1,166 ) Income tax expense Net of tax $ 1,781 $ 1,696 $ 7,386 $ 3,172 Net income Earnings per Share The following table shows the computation of basic and diluted earnings per share for the periods indicated: Three Months Ended Nine Months Ended (In thousands, except per share data) September 30, September 30, September 30, September 30, Net income $ 99,121 $ 91,948 $ 269,733 $ 263,509 Less: Preferred stock dividends 2,050 2,050 6,150 6,150 Net income applicable to common shares (A) $ 97,071 $ 89,898 $ 263,583 $ 257,359 Weighted average common shares outstanding (B) 56,690 56,366 56,627 56,268 Effect of dilutive potential common shares Common stock equivalents 773 918 724 912 Weighted average common shares and effect of dilutive potential common shares (C) 57,463 57,284 57,351 57,180 Net income per common share: Basic (A/B) $ 1.71 $ 1.59 $ 4.65 $ 4.57 Diluted (A/C) $ 1.69 $ 1.57 $ 4.60 $ 4.50 Potentially dilutive common shares can result from stock options, restricted stock unit awards, stock warrants and shares to be issued under the Employee Stock Purchase Plan and the Directors Deferred Fee and Stock Plan, being treated as if they had been either exercised or issued, computed by application of the treasury stock method. While potentially dilutive common shares are typically included in the computation of diluted earnings per share, potentially dilutive common shares are excluded from this computation in periods in which the effect would reduce the loss per share or increase the income per share.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 7, 2019, the Company completed its previously announced acquisition of STC Bancshares Corp. (“STC”). STC is the parent company of STC Capital Bank, an Illinois state-chartered bank, which operates five banking offices located in the communities of St. Charles, Geneva and South Elgin, Illinois. As of September 30, 2019, STC Capital Bank had approximately $240 million in assets, approximately $181 million in loans and approximately $208 million in deposits. On November 1, 2019, the Company completed its previously announced acquisition of SBC, Incorporated (“SBC”). SBC is the parent company of Countryside Bank, an Illinois state-chartered bank, which operates six banking offices located in Countryside, Burbank, Darien, Homer Glen, Oak Brook and Chicago, Illinois. As of October 31, 2019, Countryside Bank had approximately $578 million in assets, approximately $434 million in loans and approximately $501 million

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Basis of Accounting	The interim consolidated financial statements of Wintrust Financial Corporation and Subsidiaries (“Wintrust” or the “Company”) presented herein are unaudited, but in the opinion of management reflect all necessary adjustments of a normal or recurring nature for a fair presentation of results as of the dates and for the periods covered by the interim consolidated financial statements. The accompanying interim consolidated financial statements are unaudited and do not include information or footnotes necessary for a complete presentation of financial condition, results of operations or cash flows in accordance with U.S. generally accepted accounting principles ("GAAP"). The interim unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 (“ 2018 Form 10-K”). Operating results reported for the period are not necessarily indicative of the results which may be expected for the entire year. Reclassifications of certain prior period amounts have been made to conform to the current period presentation. The preparation of the financial statements requires management to make estimates, assumptions and judgments that affect the reported amounts of assets and liabilities. Management believes that the estimates made are reasonable, however, changes in estimates may be required if economic or other conditions develop differently from management’s expectations. Certain policies and accounting principles inherently have a greater reliance on the use of estimates, assumptions and judgments and as such have a greater possibility of producing results that could be materially different than originally reported. Management views critical accounting policies to be those which are highly dependent on subjective or complex judgments, estimates and assumptions, and where changes in those estimates and assumptions could have a significant impact on the financial statements. Management currently views the determination of the allowance for loan losses and the allowance for losses on lending-related commitments, loans acquired with evidence of credit quality deterioration since origination, estimations of fair value, the valuations required for impairment testing of goodwill, the valuation and accounting for derivative instruments and income taxes as the accounting areas that require the most subjective and complex judgments, and as such could be the most subject to revision as new information becomes available. Descriptions of the Company's significant accounting policies are included in Note 1 - “Summary of Significant Accounting Policies” of the 2018 Form 10-K.
Recent Accounting Developments	Leases In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842),” to improve transparency and comparability across entities regarding leasing arrangements. This ASU requires the recognition of a separate lease liability representing the required discounted lease payments over the lease term and a separate lease asset representing the right to use the underlying asset during the same lease term. Further, this ASU provides clarification regarding the identification of certain components of contracts that would represent a lease as well as requires additional disclosures to the notes of the financial statements. Additionally, in January 2018, the FASB issued ASU No. 2018-01, "Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842," to permit an entity to elect an optional practical expedient to not evaluate under Topic 842 land easements that exist or expired before the entity's adoption of Topic 842 and that were not previously accounted for as leases under existing accounting guidance. The FASB has continued to issue various updates to clarify and improve specific areas of ASU No. 2016-02. In July 2018, the FASB issued ASU No. 2018-10, “Codification Improvements to Topic 842, Leases,” to clarify the implementation guidance within ASU No. 2016-02 surrounding narrow aspects of Topic 842, including lessee reassessment of lease classifications, the rate implicit in a lease, lessor reassessment of lease terms and purchase options and variable lease payments that depend on an index or a rate. Also, in July 2018, the FASB issued ASU No. 2018-11, “Leases (Topic 842): Targeted Improvements,” to clarify the implementation guidance within ASU No. 2016-02 surrounding comparative period reporting requirements for initial adoption as well as separating lease and non-lease components in a contract and allocating consideration in the contract to the separate components. Also, in December 2018, the FASB issued ASU No. 2018-20, “Leases (Topic 842): Narrow-Scope Improvements for Lessors,” to clarify the implementation guidance within ASU No. 2016-02 surrounding specific aspects of lessor accounting. In March 2019, the FASB issued ASU No. 2019-01, “Codification Improvements to Topic 842, Leases,” to clarify the implementation guidance within ASU No. 2016-02 surrounding aspects of Topic 842, including determining the fair value of the underlying asset by lessors that are not manufacturers or dealers, presentation on the statement of cash flows, and transition disclosures related to Topic 250, Accounting Changes and Error Corrections. The Company adopted ASU No. 2016-02 and all subsequent updates issued to clarify and improve specific areas of this ASU as of January 1, 2019. The Company elected an o ptional transition method to apply the new guidance at the date of adoption (i.e. January 1, 2019) and continue applying current lease accounting guidance for comparative periods (i.e. reporting periods in 2018). As a result, as of January 1, 2019 , the Company recognized a separate lease liability and right-of-use asset of approximately $199.4 million and $170.6 million , respectively, for leasing arrangements in which the Company is a lessee. The difference in the separate lease liability and right-of-use asset represents any remaining amounts related to prepayments, payment deferrals and lease incentives as of January 1, 2019. As of September 30, 2019 , the separate lease liability and right-of-use asset was $192.1 million and $160.9 million , respectively. The separate liability and asset are included within accrued interest payable and other liabilities and accrued interest receivable and other assets, respectively, within the Company's Consolidated Statements of Condition. The leasing arrangements requiring recognition on the Consolidated Statements of Condition primarily related to certain banking facilities under operating lease agreements as well as other leasing arrangements in which the Company has the right-of-use of specific signage related to sponsorships and other agreements and certain automatic teller machines and other equipment. The Company utilized the following other transition elections and practical expedients: • For lessee arrangements of certain classes of underlying assets, including banking facilities and equipment, the Company elected the practical expedient to not separate non-lease components from lease components and instead to account for each separate lease and non-lease component as a single lease component. • For lessor arrangements that meet certain criteria (leasing of space in owned facilities), the Company elected the practical expedient to account for each separate lease and non-lease component as a single lease component. • A package of practical expedients applied to leases existing prior to the effective date that must all be elected together and allow a Company to not reassess: ◦ whether any expiring or existing contracts are or contain a lease; ◦ lease classification for any expired or existing leases; and ◦ whether initial direct costs for any expired or existing leases qualify for capitalization. • A practical expedient that permits the Company to continue applying its current policy for accounting for expired or existing land easements. • An accounting policy election for short-term leases (i.e. terms of 12 months or less with no purchase option expected to be exercised) to apply accounting similar to ASC 840, specifically to not recognize separate lease liabilities and right-of-use assets . As noted above, in accordance with ASU No. 2016-02 and all subsequent updates, the Company recognized a separate lease liability and right-of-use asset related to leasing arrangements in which the Company is the lessee of the identified asset. These lease arrangements include primarily the use of certain buildings, retail space and office space for the Company's operations and are considered operating leases. The underlying agreements of these arrangements often require fixed payments on a monthly basis. These fixed payments are included as consideration when measuring the separate lease liability and right-of-use asset noted above. Other payments are made on a monthly basis for certain items that are considered variable, including payments for insurance, real estate taxes and maintenance. Additionally, underlying agreements often have an initial period of use followed by certain extension periods. The Company considers such extensions for purposes of lease classification and the measurement of the separate lease liability and right-of-use asset. If the Company is reasonably certain to elect to extend the leasing arrangement, the lease term would include these periods for the purposes noted above. As a lessee, the Company cannot readily determine the rate implicit in the lease. As a result, the Company uses its incremental borrowing rate when measuring the separate lease liability and right-of-use asset. The Company estimated the incremental borrowing rate as the rate of interest that would be paid to borrow on a collateralized basis over a similar term in a similar economic environment. The following tables provide a summary of lease costs and future required fixed payments related to the Company's leasing arrangements in which it is the lessee: Three Months Ended Nine Months Ended (Dollars in thousands) September 30, September 30, Operating lease cost $ 5,299 $ 17,357 Finance lease cost: Amortization of right-of-use asset 15 15 Interest on lease liability 26 26 Short-term lease cost 134 446 Variable lease cost 724 2,213 Sublease income (164 ) (345 ) Total lease cost $ 6,034 $ 19,712 Cash paid for amounts included in the measurement of operating lease liabilities $ 6,458 $ 18,156 Cash paid for amounts included in the measurement of finance lease liabilities 24 24 Right-of-use asset obtained in exchange for new operating lease liabilities 587 3,635 Right-of-use asset obtained in exchange for new finance lease liabilities 3,498 3,498 Weighted average remaining lease term - operating leases 13.7 years Weighted average remaining lease term - finance leases 39.8 years Weighted average discount rate - operating leases 4.10 % Weighted average discount rate - finance leases 4.43 % (In thousands) Payments Remaining in 2019 $ 5,585 2020 23,253 2021 21,424 2022 20,728 2023 18,618 2024 17,741 2025 and thereafter 149,964 Total minimum future amounts $ 257,313 Impact of measuring the lease liability on a discounted basis (65,236 ) Total lease liability $ 192,077 Allowance for Credit Losses In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” to replace the current incurred loss methodology for recognizing credit losses, which delays recognition until it is probable a loss has been incurred, with a methodology that reflects an estimate of all expected credit losses and considers additional reasonable and supportable forecasted information when determining lifetime credit loss estimates. This impacts the calculation of an allowance for credit losses for all financial assets measured under the amortized cost basis, including held-to-maturity debt securities and purchased credit deteriorated ("PCD") assets at the time of and subsequent to acquisition. Additionally, credit losses related to available-for-sale debt securities would be recorded through the allowance for credit losses and not as a direct adjustment to the amortized cost of the securities. This guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and is to be applied under a modified retrospective approach through a cumulative-effect adjustment to the Company's Consolidated Statements of Condition as of the first reporting period of adoption. The FASB has continued to issue various updates to clarify and improve specific areas of ASU No. 2016-13. In November 2018, the FASB issued ASU No. 2018-19, “Codification Improvements to Topic 326, Financial Instruments—Credit Losses,” to clarify the implementation guidance within ASU No. 2016-13 surrounding narrow aspects of Topic 326, including the impact of the guidance on operating lease receivables. In May 2019, FASB issued ASU No. 2019-05, “Financial Instruments - Credit Losses (Topic 326): Targeted Transition Relief," allowing for the irrevocable election of the fair value option for certain financial assets, on an instrument-by-instrument basis, within the scope previously measured at amortized cost basis. Like ASU No. 2016-13, these ASUs are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and is to be applied under a modified retrospective approach. The Company has continued its efforts in implementation of ASU No. 2016-13 and all subsequent updates issued to clarify and improve specific areas of this ASU. As discussed previously, the Company established a committee consisting of individuals from various areas of the Company tasked with transitioning to the new requirements. Implementation activities in prior periods included a review of historical internal data, the development of modeling methodologies, including the determination of appropriate segmentation and assumptions, and the consideration of certain accounting policy elections. At this time, the Company has started the validation of model methodologies and parallel testing processes for its loan portfolios and held-to-maturity debt investment securities. Controls and processes have been designed and implemented for the continued implementation process and are being designed for the ongoing process following adoption. Further, as noted above, certain accounting policy elections are available under the new rules. At this time, the Company expects to utilize the following approach to such elections: • The Company expects to not measure an allowance for credit losses on accrued interest if such accrued interest is written off in a timely manner when deemed uncollectible. Any such write-off of accrued interest will reverse previously recognized interest income. • The Company expects to not include accrued interest within presentation and disclosures of the carrying amount of financial assets held at amortized cost. • The Company expects to estimate expected credit losses by measuring the face amount or unpaid principal balance component of the amortized cost basis of a financial asset separately from other components such as premiums, discount and deferred fees and costs. • The Company expects to not maintain current accounting policies for existing purchase credit impaired ("PCI") financial assets. At the effective date, such assets will be considered PCD assets and measured accordingly under the new rules. Goodwill In January 2017, the FASB issued ASU No. 2017-04, “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment,” to simplify the subsequent measurement of goodwill. When the carrying amount of a reporting unit exceeds its fair value, an entity would no longer be required to determine goodwill impairment by assigning the fair value of a reporting unit to all of its assets and liabilities as if that reporting unit was acquired in a business combination. Goodwill impairment would be recognized according to the excess of the carrying amount of the reporting unit over the calculated fair value of such unit. This guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and is to be applied under a prospective approach. The Company does not expect this guidance to have a material impact on the Company's consolidated financial statements. Amortization of Premium on Certain Debt Securities In March 2017, the FASB issued ASU No. 2017-08, “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities,” to amend the amortization period for certain purchased callable debt securities held at a premium. The amortization period for such securities will be shortened to the earliest call date. The Company adopted ASU No. 2017-08 as of January 1, 2019 under a modified retrospective approach. As a result, the Company recognized a cumulative effect adjustment of $1.5 million representing the accelerated amortization of premiums on certain callable debt securities directly to retained earnings on the Company's Consolidated Statements of Condition. Fair Value Measurement In August 2018, the FASB issued ASU No. 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirement for Fair Value Measurement,” to modify disclosure requirements on fair value measurements and inputs. This guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and is to be applied prospectively or retrospectively depending upon the disclosure requirement. Early adoption is permitted. The Company does not expect this guidance to have a material impact on the Company's consolidated financial statements. Intangibles In August 2018, the FASB issued ASU No. 2018-15, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract,” to align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with similar requirements related to implementation costs incurred to develop or obtain internal-use software. In addition, the amendment requires any capitalized implementation costs related to a hosting arrangement to be expensed over the term of the hosting arrangement. This guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and is to be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. Early adoption is permitted, including adoption in any interim period. The Company is currently evaluating the impact of adopting this new guidance on the consolidated financial statements. Codification Improvements In April 2019, the FASB issued ASU No. 2019-04, “Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments”. The FASB has continued to issue various updates to clarify and improve specific areas of ASU No. 2016-01, ASU No. 2016-13, and ASU No. 2017-12. Amendments related to ASU No. 2016-01 are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and can be early adopted, under a modified retrospective approach, since the Company has already adopted ASU No. 2016-01. Since the Company has not yet adopted ASU No. 2016-13, the effective dates and transition requirements for the amendments related to ASU No. 2019-04 are the same as the effective dates and transition requirements in ASU No. 2016-13 described above. Amendments related to ASU No. 2017-12 are effective as of the beginning of the first annual period beginning after the issuance date of ASU No. 2019-04 and can be early adopted since the Company has already adopted ASU No. 2017-12. The Company is currently evaluating the impact of adopting this new guidance on the consolidated financial statements.
PCI Loans	PCI Loans Purchased loans acquired in a business combination are recorded at estimated fair value on their purchase date. For PCI loans, expected future cash flows at the purchase date in excess of the fair value of loans are recorded as interest income over the life of the loans if the timing and amount of the future cash flows is reasonably estimable (“accretable yield”). The difference between contractually required payments and the cash flows expected to be collected at acquisition is referred to as the non-accretable difference and represents probable losses in the portfolio. In determining the acquisition date fair value of PCI loans, and in subsequent accounting, the Company aggregates these purchased loans into pools of loans by common risk characteristics, such as credit risk rating and loan type. Subsequent to the purchase date, increases in cash flows over those expected at the purchase date are recognized as interest income prospectively. Subsequent decreases to the expected cash flows will result in a provision for loan losses. The Company purchased a portfolio of life insurance premium finance receivables in 2009. These purchased life insurance premium finance receivables are valued on an individual basis. If credit related conditions deteriorate, an allowance related to these loans will be established as part of the provision for credit losses.
Cash and Cash Equivalents	For purposes of the Consolidated Statements of Cash Flows, the Company considers cash and cash equivalents to include cash on hand, cash items in the process of collection, non-interest bearing amounts due from correspondent banks, federal funds sold and securities purchased under resale agreements with original maturities of three months or less. These items are included within the Company’s Consolidated Statements of Condition as cash and due from banks, and federal funds sold and securities purchased under resale agreements.
Investment Securities	During the nine months ended September 30, 2019 , the Company recorded $263,000 of impairment of equity securities without readily determinable fair values. The Company conducts a quarterly assessment of its equity securities without a readily determinable fair values to determine whether impairment exists in such securities, considering, among other factors, the nature of the securities, financial condition of the issuer and expected future cash flows. no upward adjustment and no downward adjustments on such securities in the third quarter of 2019 related to observable price changes in orderly transactions for the identical or a similar investment of the same issuer. The Company monitors its equity investments without a readily determinable fair values to identify potential transactions that may indicate an observable price change requiring adjustment to its carrying amount. The Company conducts a regular assessment of its investment securities to determine whether securities are other-than-temporarily impaired considering, among other factors, the nature of the securities, credit ratings or financial condition of the issuer, the extent and duration of the unrealized loss, expected cash flows, market conditions and the Company’s ability to hold the securities through the anticipated recovery period. The Company does not consider securities with unrealized losses at September 30, 2019 to be other-than-temporarily impaired. The Company does not intend to sell these investments and it is more likely than not that the Company will not be required to sell these investments before recovery of the amortized cost bases, which may be the maturity dates of the securities. The unrealized losses within each category have occurred as a result of changes in interest rates, market spreads and market conditions subsequent to purchase. Securities with continuous unrealized losses existing for more than twelve months were primarily mortgage-backed securities, U.S. Government agency securities and corporate notes.
Finance, Loans and Leases Receivable	Certain premium finance receivables are recorded net of unearned income.
Receivables	These amounts are included within interest and fees on loans in the Consolidated Statements of Income.
Allowance and Nonperforming Loans, Allowance	The Company's ability to manage credit risk depends in large part on our ability to properly identify and manage problem loans. To do so, the Company operates a credit risk rating system under which our credit management personnel assign a credit risk rating (1 to 10 rating) to each loan at the time of origination and review loans on a regular basis. Each loan officer is responsible for monitoring his or her loan portfolio, recommending a credit risk rating for each loan in his or her portfolio and ensuring the credit risk ratings are appropriate. These credit risk ratings are then ratified by the bank’s chief credit officer and/or concurrence credit officer. Credit risk ratings are determined by evaluating a number of factors including: a borrower’s financial strength, cash flow coverage, collateral protection and guarantees. The Company’s Problem Loan Reporting system automatically includes all loans with credit risk ratings of 6 through 9. This system is designed to provide an on-going detailed tracking mechanism for each problem loan. Once management determines that a loan has deteriorated to a point where it has a credit risk rating of 6 or worse, the Company’s Managed Asset Division performs an overall credit and collateral review. As part of this review, all underlying collateral is identified and the valuation methodology is analyzed and tracked. As a result of this initial review by the Company’s Managed Asset Division, the credit risk rating is reviewed and a portion of the outstanding loan balance may be deemed uncollectible or an impairment reserve may be established. The Company’s impairment analysis utilizes an independent re-appraisal of the collateral (unless such a third-party evaluation is not possible due to the unique nature of the collateral, such as a closely-held business or thinly traded securities). In the case of commercial real estate collateral, an independent third party appraisal is ordered by the Company’s Real Estate Services Group to determine if there has been any change in the underlying collateral value. These independent appraisals are reviewed by the Real Estate Services Group and sometimes by independent third party valuation experts and may be adjusted depending upon market conditions. Through the credit risk rating process, loans are reviewed to determine if they are performing in accordance with the original contractual terms. If the borrower has failed to comply with the original contractual terms, further action may be required by the Company, including a downgrade in the credit risk rating, movement to non-accrual status, a charge-off or the establishment of a specific impairment reserve. If a loan amount, or portion thereof, is determined to be uncollectible, the loan’s credit risk rating is immediately downgraded to an 8 or 9 and the uncollectible amount is charged-off. Any loan that has a partial charge-off continues to be assigned a credit risk rating of an 8 or 9 for the duration of time that a balance remains outstanding. The Company undertakes a thorough and ongoing analysis to determine if additional impairment and/or charge-offs are appropriate and to begin a workout plan for the credit to minimize actual losses. If, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement, a specific impairment reserve is established. In determining the appropriate charge-off for collateral-dependent loans, the Company considers the results of appraisals for the associated collateral.
Loans and Leases Receivable, Nonperforming Loan and Lease	Non-performing loans include all non-accrual loans (8 and 9 risk ratings) as well as loans 90 days past due and still accruing interest, excluding PCI loans. The remainder of the portfolio is considered performing under the contractual terms of the loan agreement.
Impaired Financing Receivable	A loan is considered to be impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due pursuant to the contractual terms of the loan agreement. A loan modified in a TDR is an impaired loan according to applicable accounting guidance. Impairment is measured by estimating the fair value of the loan based on the present value of expected cash flows, the market price of the loan, or the fair value of the underlying collateral. Impaired loans are considered a fair value measurement where an allowance is established based on the fair value of collateral. Appraised values, which may require adjustments to market-based valuation inputs, are generally used on real estate collateral-dependent impaired loans.
Loans and Leases Receivable, Troubled Debt Restructuring	The Company’s approach to restructuring loans, excluding PCI loans, is built on its credit risk rating system which requires credit management personnel to assign a credit risk rating to each loan. In each case, the loan officer is responsible for recommending a credit risk rating for each loan and ensuring the credit risk ratings are appropriate. These credit risk ratings are then reviewed and approved by the bank’s chief credit officer and/or concurrence credit officer. Credit risk ratings are determined by evaluating a number of factors including a borrower’s financial strength, cash flow coverage, collateral protection and guarantees. The Company’s credit risk rating scale is one through ten with higher scores indicating higher risk. In the case of loans rated six or worse following modification, the Company’s Managed Assets Division evaluates the loan and the credit risk rating and determines that the loan has been restructured to be reasonably assured of repayment and of performance according to the modified terms and is supported by a current, well-documented credit assessment of the borrower’s financial condition and prospects for repayment under the revised terms. A modification of a loan, excluding PCI loans, with an existing credit risk rating of 6 or worse or a modification of any other credit, which will result in a restructured credit risk rating of six or worse, must be reviewed for possible TDR classification. In that event, our Managed Assets Division conducts an overall credit and collateral review. A modification of these loans is considered to be a TDR if both (1) the borrower is experiencing financial difficulty and (2) for economic or legal reasons, the bank grants a concession to a borrower that it would not otherwise consider. The modification of a loan, excluding PCI loans, where the credit risk rating is 5 or better both before and after such modification is not considered to be a TDR. Based on the Company’s credit risk rating system, it considers that borrowers whose credit risk rating is 5 or better are not experiencing financial difficulties and therefore, are not considered TDRs. All credits determined to be a TDR will continue to be classified as a TDR in all subsequent periods, unless the borrower has been in compliance with the loan’s modified terms for a period of six months (including over a calendar year-end) and the current interest rate represents a market rate at the time of restructuring. The Managed Assets Division, in consultation with the respective loan officer, determines whether the modified interest rate represented a current market rate at the time of restructuring. Using knowledge of current market conditions and rates, competitive pricing on recent loan originations, and an assessment of various characteristics of the modified loan (including collateral position and payment history), an appropriate market rate for a new borrower with similar risk is determined. If the modified interest rate meets or exceeds this market rate for a new borrower with similar risk, the modified interest rate represents a market rate at the time of restructuring. Additionally, before removing a loan from TDR classification, a review of the current or previously measured impairment on the loan and any concerns related to future performance by the borrower is conducted. If concerns exist about the future ability of the borrower to meet its obligations under the loans based on a credit review by the Managed Assets Division, the TDR classification is not removed from the loan. TDRs are reviewed at the time of the modification and on a quarterly basis to determine if a specific reserve is necessary. The carrying amount of the loan is compared to the expected payments to be received, discounted at the loan's original rate, or for collateral dependent loans, to the fair value of the collateral. Any shortfall is recorded as a specific reserve. The Company, in accordance with ASC 310-10, continues to individually measure impairment of these loans after the TDR classification is removed. Each TDR was reviewed for impairment at September 30, 2019 and approximately $5.9 million of impairment was present and appropriately reserved for through the Company’s normal reserving methodology in the Company’s allowance for loan losses. TDRs may arise when, due to financial difficulties experienced by the borrower, the Company obtains through physical possession one or more collateral assets in satisfaction of all or part of an existing credit. Once possession is obtained, the Company reclassifies the appropriate portion of the remaining balance of the credit from loans to OREO, which is included within other assets in the Consolidated Statements of Condition. For any residential real estate property collateralizing a consumer mortgage loan, the Company is considered to possess the related collateral only if legal title is obtained upon completion of foreclosure, or the borrower conveys all interest in the residential real estate property to the Company through completion of a deed in lieu of foreclosure or similar legal agreement. At September 30, 2019 , the Company had $2.5 million of foreclosed residential real estate properties included within OREO. Furthermore, the recorded investment in residential mortgage loans secured by residential real estate properties for which foreclosure proceedings are in process totaled $12.6 million and $14.2 million at September 30, 2019 and 2018 , respectively.
Goodwill	At June 30, 2019, the Company utilized a qualitative approach for its annual goodwill impairment test of the community banking segment and determined that it is not more likely than not that an impairment existed at that time. At December 31, 2018, the Company utilized a quantitative approach for its annual goodwill impairment tests of the specialty finance and wealth management segments and determined that no impairment existed at that time. At each reporting date between annual goodwill impairment tests, the Company considers potential indicators of impairment. As of September 30, 2019 , the Company identified no such indicators of goodwill impairment within the community banking, specialty finance and wealth management segments.
Intangible Assets	The core deposit intangibles recognized in connection with prior bank acquisitions are amortized over a ten -year period on an accelerated basis. The customer list intangibles recognized in connection with the purchase of life insurance premium finance assets in 2009 are being amortized over an 18 -year period on an accelerated basis. The customer list and other intangibles recognized in connection with prior acquisitions within the wealth management segment are being amortized over a period of up to ten years on a straight-line basis. Indefinite-lived intangible assets consist of certain trade and domain names recognized in connection with the Veterans First acquisition. As indefinite-lived intangible assets are not amortized, the Company assesses impairment on at least an annual basis.
Transfers and Servicing of Financial Assets, Servicing of Financial Assets	The Company recognizes MSR assets upon the sale of residential real estate loans to external third parties when it retains the obligation to service the loans and the servicing fee is more than adequate compensation. The initial recognition of MSR assets from loans sold with servicing retained and subsequent changes in fair value of all MSRs are recognized in mortgage banking revenue. MSRs are subject to changes in value from actual and expected prepayment of the underlying loans. Starting in 2019, the Company periodically purchased options for the right to purchase securities not currently held within the banks' investment portfolios. These option transactions are designed primarily to economically hedge a portion of the potential negative fair value adjustments related to MSRs. The Company did not specifically hedge the value of its MSRs during the third quarter of 2018. For more information regarding the hedges in 2019, see Note 15 - Derivative Financial Instruments in Item 1 of this report. Fair values are determined by using a discounted cash flow model that incorporates the objective characteristics of the portfolio as well as subjective valuation parameters that purchasers of servicing would apply to such portfolios sold into the secondary market. The subjective factors include loan prepayment speeds, discount rates, servicing costs and other economic factors. The Company uses a third party to assist in the valuation of MSRs.
Offsetting Assets and Liabilities	The Company records securities sold under repurchase agreements at their gross value and does not offset positions on the Consolidated Statements of Condition.
Repurchase Agreements	Securities pledged for customer balances in sweep accounts and short-term borrowings from brokers are maintained under the Company’s control and consist of U.S. Government agency and mortgage-backed securities. These securities are included in the available-for-sale and held-to-maturity securities portfolios as reflected on the Company’s Consolidated Statements of Condition.
Debt	notes are stated at par adjusted for unamortized issuance costs paid related to such debt.The Term Facility is stated at par of the current outstanding balance of the debt adjusted for unamortized costs paid by the Company in relation to the debt issuance. The Company was contractually required to borrow the entire amount of the Term Facility on September 18, 2018 and all such borrowings must be repaid by September 18, 2023. Beginning December 31, 2018, the Company is required to make quarterly payments of principal plus interest on the Term Facility. During the second quarter of 2019, the Company borrowed $35.0 million under the Revolving Credit Facility and paid off such amount prior to June 30, 2019. At September 30, 2019, the Company had no outstanding balance under the Revolving Credit Facility. Unamortized costs paid by the Company in relation to the issuance of the Revolving Credit Facility are classified in other assets on the Consolidated Statements of Condition.
Transfers and Servicing of Financial Assets, Transfers of Financial Assets	The remaining $14.2 million within secured borrowings at September 30, 2019 represents other sold interests in certain loans by the Company that were not considered sales and, as such, related proceeds received are reflected on the Company’s Consolidated Statements of Condition as a secured borrowing owed to the various unrelated third parties.
Junior Subordinated Debentures	The Trusts are reported in the Company’s consolidated financial statements as unconsolidated subsidiaries. Accordingly, in the Consolidated Statements of Condition, the junior subordinated debentures issued by the Company to the Trusts are reported as liabilities and the common securities of the Trusts, all of which are owned by the Company, are included in investment securities.
Revenue Recognition	Wealth Management Revenue Wealth management revenue is comprised of brokerage and insurance product commissions, managed money fees and trust and asset management revenue of the Company's four wealth management subsidiaries: Wintrust Investments, Great Lakes Advisors, LLC ("GLA"), The Chicago Trust Company, N.A. ("CTC") and CDEC. All wealth management revenue is recognized in the wealth management segment. Brokerage and insurance product commissions consists primarily of commissions earned from trade execution services on behalf of customers and from selling mutual funds, insurance and other investment products to customers. For trade execution services, the Company recognizes commissions and receives payment from the brokerage customers at the point of transaction execution. Commissions received from the investment or insurance product providers are recognized at the point of sale of the product. The Company also receives trail and other commissions from providers for certain plans. These are generally based on qualifying account values and are recognized once the performance obligation, specific to each provider, is satisfied on a monthly, quarterly or annual basis. Trust revenue is earned primarily from trust and custody services that are generally performed over time as well as fees earned on funds held during the facilitation of tax-deferred like-kind exchange transactions. Revenue is determined periodically based on a schedule of fees applied to the value of each customer account using a time-elapsed method to measure progress toward complete satisfaction of the performance obligation. Fees are typically billed on a calendar month or quarter basis in advance or in arrears depending upon the contract. Upfront fees received related to the facilitation of tax-deferred like-kind exchange transactions are deferred until the transaction is completed. Additional fees earned for certain extraordinary services performed on behalf of the customers are recognized when the service has been performed. Asset management revenue is earned from money management and advisory services that are performed over time. Revenue is based primarily on the market value of assets under management or administration using a time-elapsed method to measure progress toward complete satisfaction of the performance obligation. Fees are typically billed on a calendar month or quarter basis in advance or in arrears depending upon the contract. Certain programs provide the customer with an option of paying fees as a percentage of the account value or incurring commission charges for each trade similar to brokerage and insurance product commissions. Trade commissions and any other fees received for additional services are recognized at a point in time once the performance obligation is satisfied. Mortgage Broker Fees For customers desiring a mortgage product not currently offered by the Company, the Company may refer such customers and, with permission, direct such customers' applications to certain third party mortgage brokers. Mortgage broker fees are received from these brokers for such customer referrals upon settlement of the underlying mortgage. The Company's entitlement to the consideration is contingent on the settlement of the mortgage which is highly susceptible to factors outside of the Company's influence, such as third party broker's underwriting requirements. Also, the uncertainty surrounding the consideration could be resolved in varying lengths of time, dependent upon the third party brokers. Therefore, mortgage broker fees are recognized at the settlement of the underlying mortgage when the consideration is received. Broker fees are recognized in the community banking segment. Service Charges on Deposit Accounts Service charges on deposit accounts include fees charged to deposit customers for various services, including account analysis services, and are based on factors such as the size and type of customer, type of product and number of transactions. The fees are based on a standard schedule of fees and, depending on the nature of the service performed, the service is performed at a point in time or over a period of a month. When the service is performed at a point in time, the Company recognizes and receives revenue when the service has been performed. When the service is performed over a period of a month, the Company recognizes and receives revenue in the month the service has been performed. Service charges on deposit accounts are recognized in the community banking segment. Administrative Services Administrative services revenue is earned from providing outsourced administrative services, such as data processing of payrolls, billing and cash management services, to temporary staffing service clients located throughout the United States. Fees are charged periodically (typically a payroll cycle) and computed in accordance with the contractually determined rate applied to the total gross billings administered for the period. The revenue is recognized over the period using a time-elapsed method to measure progress toward complete satisfaction of the performance obligation. Other fees are charged on a per occurrence basis as the service is provided in the billing cycle. The Company has certain contracts with customers to perform outsourced administrative services and short-term accounts receivable financing. For these contracts, the total fee is allocated between the administrative services revenue and interest income during the client onboarding process based on the specific client and services provided. Administrative services revenue is recognized in the specialty finance segment. Card and Other Deposit Related Fees Card related fees include interchange and merchant revenue, and fees related to debit and credit cards. Interchange revenue is related to the Company issued debit cards. Other deposit related fees primarily include pay by phone processing fees, ATM and safe deposit box fees, check order charges and foreign currency related fees. Card and deposit related fees are generally based on volume of transactions and are recognized at the point in time when the service has been performed. For any consideration that is constrained, the revenue is recognized once the uncertainty is known. Upfront fees received from certain contracts are recognized on a straight line basis over the term of the contract. Card and deposit related fees are recognized in the community banking segment. Contract liabilities represent upfront fees that the Company received at inception of certain contracts. The revenue recognized that was included in the contract liability balance at beginning of the period totaled $667,000 and $278,000 for the nine months ended September 30, 2019 and 2018 , respectively. Receivables are recognized in the period the Company provides services when the Company's right to consideration is unconditional. Card related fee receivable is the result of volume based fee that the Company receives from a customer on an annual basis in the second quarter of each year. Payment terms on other invoiced amounts are typically 30 days or less. Contract liabilities and receivables from contracts with customers are included within the accrued interest payable and other liabilities and accrued interest receivable and other assets line items, respectively, in the Consolidated Statements of Condition. Practical Expedients and Exemptions The Company does not adjust the promised amount of consideration for the effects of a significant financing component if the Company expects, at contract inception, that the period between when the Company transfers a promised service to a customer and when the customer pays for that services is one year or less. The Company recognizes the incremental costs of obtaining a contract as an expense when incurred if the amortization period of the asset that the entity otherwise would have recognized is one year or less.
Segment Reporting	The Company’s operations consist of three primary segments: community banking, specialty finance and wealth management. The three reportable segments are strategic business units that are separately managed as they offer different products and services and have different marketing strategies. In addition, each segment’s customer base has varying characteristics and each segment has a different regulatory environment. While the Company’s management monitors each of the fifteen bank subsidiaries’ operations and profitability separately, these subsidiaries have been aggregated into one reportable operating segment due to the similarities in products and services, customer base, operations, profitability measures, and economic characteristics. For purposes of internal segment profitability, management allocates certain intersegment and parent company balances. Management allocates a portion of revenues to the specialty finance segment related to loans and leases originated by the specialty finance segment and sold or assigned to the community banking segment. Similarly, for purposes of analyzing the contribution from the wealth management segment, management allocates a portion of the net interest income earned by the community banking segment on deposit balances of customers of the wealth management segment to the wealth management segment. See Note 10 — Deposits, for more information on these deposits. Finally, expenses incurred at the Wintrust parent company are allocated to each segment based on each segment's risk-weighted assets. The segment financial information provided in the following tables has been derived from the internal profitability reporting system used by management to monitor and manage the financial performance of the Company. The accounting policies of the segments are substantially similar to those described in “Summary of Significant Accounting Policies” in Note 1 of the Company’s 2018 Form 10-K. The Company evaluates segment performance based on after-tax profit or loss and other appropriate profitability measures common to each segment.
Derivatives	For derivatives designated and that qualify as fair value hedges, the net gain or loss from the entire change in the fair value of the derivative instrument is recognized in the same income statement line item as the earnings effect, including the net gain or loss, of the hedged item (interest income earned on fixed rate loans) when the hedged item affects earnings. The Company recognizes derivative financial instruments in the consolidated financial statements at fair value regardless of the purpose or intent for holding the instrument. The Company records derivative assets and derivative liabilities on the Consolidated Statements of Condition within accrued interest receivable and other assets and accrued interest payable and other liabilities, respectively. Changes in the fair value of derivative financial instruments are either recognized in income or in shareholders’ equity as a component of accumulated other comprehensive income or loss depending on whether the derivative financial instrument qualifies for hedge accounting and, if so, whether it qualifies as a fair value hedge or cash flow hedge. Changes in fair values of derivatives accounted for as fair value hedges are recorded in income in the same period and in the same income statement line as changes in the fair values of the hedged items that relate to the hedged risk(s). Changes in fair values of derivative financial instruments accounted for as cash flow hedges are recorded as a component of accumulated other comprehensive income or loss, net of deferred taxes, and reclassified to earnings when the hedged transaction affects earnings. Changes in fair values of derivative financial instruments not designated in a hedging relationship pursuant to ASC 815 are reported in non-interest income during the period of the change. Derivative financial instruments are valued by a third party and are corroborated by comparison with valuations provided by the respective counterparties. Fair values of certain mortgage banking derivatives (interest rate lock commitments and forward commitments to sell mortgage loans) are estimated based on changes in mortgage interest rates from the date of the loan commitment. The fair value of foreign currency derivatives is computed based on changes in foreign currency rates stated in the contract compared to those prevailing at the measurement date.
Derivatives, Offsetting Fair Value Amounts	The Company records interest rate derivatives subject to master netting agreements at their gross value and does not offset derivative assets and liabilities on the Consolidated Statements of Condition.
Fair Value of Financial Instruments	The Company measures, monitors and discloses certain of its assets and liabilities on a fair value basis. These financial assets and financial liabilities are measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the observability of the inputs used to determine fair value. These levels are: • Level 1—unadjusted quoted prices in active markets for identical assets or liabilities. • Level 2 — inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability or inputs that are derived principally from or corroborated by observable market data by correlation or other means. • Level 3—significant unobservable inputs that reflect the Company’s own assumptions that market participants would use in pricing the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. A financial instrument’s categorization within the above valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the assets or liabilities. The following is a description of the valuation methodologies used for the Company’s assets and liabilities measured at fair value on a recurring basis. Available-for-sale debt securities, trading account securities and equity securities with readily determinable fair value —Fair values for available-for-sale debt securities, trading account securities and equity securities with readily determinable fair value are typically based on prices obtained from independent pricing vendors. Securities measured with these valuation techniques are generally classified as Level 2 of the fair value hierarchy. Typically, standard inputs such as benchmark yields, reported trades for similar securities, issuer spreads, benchmark securities, bids, offers and reference data including market research publications are used to fair value these securities. When these inputs are not available, broker/dealer quotes may be obtained by the vendor to determine the fair value of the security. We review the vendor’s pricing methodologies to determine if observable market information is being used, versus unobservable inputs. Fair value measurements using significant inputs that are unobservable in the market due to limited activity or a less liquid market are classified as Level 3 in the fair value hierarchy. The fair value of U.S. Treasury securities and certain equity securities with readily determinable fair value are based on unadjusted quoted prices in active markets for identical securities. As such, these securities are classified as Level 1 in the fair value hierarchy. The Company’s Investment Operations Department is responsible for the valuation of Level 3 available-for-sale debt securities. The methodology and variables used as inputs in pricing Level 3 securities are derived from a combination of observable and unobservable inputs. The unobservable inputs are determined through internal assumptions that may vary from period to period due to external factors, such as market movement and credit rating adjustments. At September 30, 2019 , the Company classified $113.1 million of municipal securities as Level 3. These municipal securities are bond issues for various municipal government entities primarily located in the Chicago metropolitan area and southern Wisconsin and are privately placed, non-rated bonds without CUSIP numbers. The Company also classified $2.8 million of U.S. Government agencies as Level 3 at September 30, 2019 . The Company’s methodology for pricing these securities focuses on three distinct inputs: equivalent rating, yield and other pricing terms. To determine the rating for a given non-rated municipal bond, the Investment Operations Department references a rated, publicly issued bond by the same issuer if available. A reduction is then applied to the rating obtained from the comparable bond, as the Company believes if liquidated, a non-rated bond would be valued less than a similar bond with a verifiable rating. The reduction applied by the Company is one complete rating grade (i.e. a “AA” rating for a comparable bond would be reduced to “A” for the Company’s valuation). For bond issues without comparable bond proxies, a rating of "BBB" was assigned. In the third quarter of 2019 , all of the ratings derived by the Investment Operations Department using the above process were "BBB" or better. The fair value measurement of municipal bonds is sensitive to the rating input, as a higher rating typically results in an increased valuation. The remaining pricing inputs used in the bond valuation are observable. Based on the rating determined in the above process, Investment Operations obtains a corresponding current market yield curve available to market participants. Other terms including coupon, maturity date, redemption price, number of coupon payments per year, and accrual method are obtained from the individual bond term sheets. Certain municipal bonds held by the Company at September 30, 2019 are continuously callable. When valuing these bonds, the fair value is capped at par value as the Company assumes a market participant would not pay more than par for a continuously callable bond. To determine the rating for the U.S. Government agency securities, the Investment Operations Department assigned a AAA rating as it is guaranteed by the U.S. government. Mortgage loans held-for-sale —The fair value of mortgage loans held-for-sale is determined by reference to investor price sheets for loan products with similar characteristics. As such, these loans are classified as Level 2 in the fair value hierarchy. Loans held-for-investment —The fair value for loans in which the Company elected the fair value option is estimated by discounting future scheduled cash flows for the specific loan through maturity, adjusted for estimated credit losses and prepayments. The Company uses a discount rate based on the actual coupon rate of the underlying loan. At September 30, 2019 , the Company classified $10.0 million of loans held-for-investment as Level 3. The weighted average discount rate used as an input to value these loans at September 30, 2019 was 3.36% with discount rates applied ranging from 3% - 4% . The higher the rate utilized to discount estimated future cash flows, the lower the fair value measurement. As noted above, the fair value estimate also includes assumptions of prepayment speeds and credit losses. The Company included a prepayments speed assumption of 15.03% at September 30, 2019 . Prepayment speeds are inversely related to the fair value of these loans as an increase in prepayment speeds results in a decreased valuation. Additionally, the weighted average credit discount used as an input to value the specific loans was 1.35% with credit loss discount ranging from 0% - 7% at September 30, 2019 . MSRs —Fair value for MSRs is determined utilizing a valuation model which calculates the fair value of each servicing rights based on the present value of estimated future cash flows. The Company uses a discount rate commensurate with the risk associated with each servicing rights, given current market conditions. At September 30, 2019 , the Company classified $75.6 million of MSRs as Level 3. The weighted average discount rate used as an input to value the pool of MSRs at September 30, 2019 was 9.96% with discount rates applied ranging from 9% - 19% . The higher the rate utilized to discount estimated future cash flows, the lower the fair value measurement. The fair value of MSRs was also estimated based on other assumptions including prepayment speeds and the cost to service. Prepayment speeds used as an input to value the MSRs at September 30, 2019 ranged from 0% - 93% or a weighted average prepayment speed of 15.03% . Further, for current and delinquent loans, the Company assumed a weighted average cost of servicing of $77 and $399 , respectively, per loan. Prepayment speeds and the cost to service are both inversely related to the fair value of MSRs as an increase in prepayment speeds or the cost to service results in a decreased valuation. See Note 9 - Mortgage Servicing Rights (“MSRs”) for further discussion of MSRs. Derivative instruments —The Company’s derivative instruments include interest rate swaps, caps and collars, commitments to fund mortgages for sale into the secondary market (interest rate locks), forward commitments to end investors for the sale of mortgage loans and foreign currency contracts. Interest rate swaps, caps and collars are valued by a third party, using models that primarily use market observable inputs, such as yield curves, and are classified as Level 2 in the fair value hierarchy. The credit risk associated with derivative financial instruments that are subject to master netting agreements is measured on a net basis by counterparty portfolio. The fair value for mortgage-related derivatives is based on changes in mortgage rates from the date of the commitments. The fair value of foreign currency derivatives is computed based on change in foreign currency rates stated in the contract compared to those prevailing at the measurement date. At September 30, 2019 , the Company classified $3.0 million of derivative assets related to interest rate locks as Level 3. The fair value of interest rate locks is based on prices obtained for loans with similar characteristics from third parties, adjusted for the pull-through rate, which represents the Company’s best estimate of the likelihood that a committed loan will ultimately fund. The weighted-average pull-through rate at September 30, 2019 was 75.00% with pull-through rates applied ranging from 0% to 100% . Pull-through rates are directly related to the fair value of interest rate locks as an increase in the pull-through rate results in an increased valuation. Nonqualified deferred compensation assets —The underlying assets relating to the nonqualified deferred compensation plan are included in a trust and primarily consist of non-exchange traded institutional funds which are priced based by an independent third party service. These assets are classified as Level 2 in the fair value hierarchy.
Foreclosed Assets	Other real estate owned is comprised of real estate acquired in partial or full satisfaction of loans and is included in other assets. Other real estate owned is recorded at its estimated fair value less estimated selling costs at the date of transfer, with any excess of the related loan balance over the fair value less expected selling costs charged to the allowance for loan losses. Subsequent changes in value are reported as adjustments to the carrying amount and are recorded in other non-interest expense. Gains and losses upon sale, if any, are also charged to other non-interest expense. Fair value is generally based on third party appraisals and internal estimates that are adjusted by a discount representing the estimated cost of sale and is therefore considered a Level 3 valuation.
Fair Value Measurement	The Company is required under applicable accounting guidance to report the fair value of all financial instruments on the Consolidated Statements of Condition, including those financial instruments carried at cost.Also, the Company may be required, from time to time, to measure certain other financial assets at fair value on a nonrecurring basis in accordance with GAAP. These adjustments to fair value usually result from impairment charges on individual assets. The following methods and assumptions were used by the Company in estimating fair values of financial instruments that were not previously disclosed. Held-to-maturity securities. Held-to-maturity securities include U.S. Government-sponsored agency securities and municipal bonds issued by various municipal government entities primarily located in the Chicago metropolitan area and southern Wisconsin. Fair values for held-to-maturity securities are typically based on prices obtained from independent pricing vendors. In accordance with ASC 820, the Company has generally categorized these held-to-maturity securities as a Level 2 fair value measurement. Fair values for certain other held-to-maturity securities are based on the bond pricing methodology discussed previously related to certain available-for-sale securities. In accordance with ASC 820, the Company has categorized these held-to-maturity securities as a Level 3 fair value measurement. Loans held-for-investment, at amortized cost. Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are analyzed by type such as commercial, residential real estate, etc. Each category is further segmented by interest rate type (fixed and variable) and term. For variable-rate loans that reprice frequently, estimated fair values are based on carrying values. The fair value of residential loans is based on secondary market sources for securities backed by similar loans, adjusted for differences in loan characteristics. The fair value for other fixed rate loans is estimated by discounting scheduled cash flows through the estimated maturity using estimated market discount rates that reflect credit and interest rate risks inherent in the loan. Deposits with stated maturities. The fair value of certificates of deposit is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently in effect for deposits of similar remaining maturities. In accordance with ASC 820, the Company has categorized deposits with stated maturities as a Level 3 fair value measurement. FHLB advances. The fair value of FHLB advances is obtained from the FHLB which uses a discounted cash flow analysis based on current market rates of similar maturity debt securities to discount cash flows. In accordance with ASC 820, the Company has categorized FHLB advances as a Level 3 fair value measurement. Subordinated notes. The fair value of the subordinated notes is based on a market price obtained from an independent pricing vendor. In accordance with ASC 820, the Company has categorized subordinated notes as a Level 2 fair value measurement. Junior subordinated debentures. The fair value of the junior subordinated debentures is based on the discounted value of contractual cash flows. In accordance with ASC 820, the Company has categorized junior subordinated debentures as a Level 3 fair value measurement.
Stock-Based Compensation	Stock-based compensation is measured as the fair value of an award on the date of grant, and the measured cost is recognized over the period which the recipient is required to provide service in exchange for the award. The fair values of restricted share and performance-based stock awards are determined based on the average of the high and low trading prices on the grant date, and the fair value of stock options is estimated using a Black-Scholes option-pricing model that utilizes various assumptions. Option-pricing models require the input of highly subjective assumptions and are sensitive to changes in the option's expected life and the price volatility of the underlying stock, which can materially affect the fair value estimate. Management reviews and adjusts the assumptions used to calculate the fair value of an option on a periodic basis to better reflect expected trends.
Option and Incentive Plans	Stock based compensation is recognized based upon the number of awards that are ultimately expected to vest, taking into account expected forfeitures. In addition, for performance-based awards, an estimate is made of the number of shares expected to vest as a result of actual performance against the performance criteria in the award to determine the amount of compensation expense to recognize. The estimate is reevaluated periodically and total compensation expense is adjusted for any change in estimate in the current period.
Earnings Per Share	Potentially dilutive common shares can result from stock options, restricted stock unit awards, stock warrants and shares to be issued under the Employee Stock Purchase Plan and the Directors Deferred Fee and Stock Plan, being treated as if they had been either exercised or issued, computed by application of the treasury stock method. While potentially dilutive common shares are typically included in the computation of diluted earnings per share, potentially dilutive common shares are excluded from this computation in periods in which the effect would reduce the loss per share or increase the income per share.

Recent Accounting Developments

Recent Accounting Developments (Tables)	9 Months Ended
	Sep. 30, 2019
Accounting Changes and Error Corrections [Abstract]
Summary of Lease Costs	The following tables provide a summary of lease costs and future required fixed payments related to the Company's leasing arrangements in which it is the lessee: Three Months Ended Nine Months Ended (Dollars in thousands) September 30, September 30, Operating lease cost $ 5,299 $ 17,357 Finance lease cost: Amortization of right-of-use asset 15 15 Interest on lease liability 26 26 Short-term lease cost 134 446 Variable lease cost 724 2,213 Sublease income (164 ) (345 ) Total lease cost $ 6,034 $ 19,712 Cash paid for amounts included in the measurement of operating lease liabilities $ 6,458 $ 18,156 Cash paid for amounts included in the measurement of finance lease liabilities 24 24 Right-of-use asset obtained in exchange for new operating lease liabilities 587 3,635 Right-of-use asset obtained in exchange for new finance lease liabilities 3,498 3,498 Weighted average remaining lease term - operating leases 13.7 years Weighted average remaining lease term - finance leases 39.8 years Weighted average discount rate - operating leases 4.10 % Weighted average discount rate - finance leases 4.43 %
Future Required Fixed Lease Payments	(In thousands) Payments Remaining in 2019 $ 5,585 2020 23,253 2021 21,424 2022 20,728 2023 18,618 2024 17,741 2025 and thereafter 149,964 Total minimum future amounts $ 257,313 Impact of measuring the lease liability on a discounted basis (65,236 ) Total lease liability $ 192,077

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	The following tables are a summary of the investment securities portfolios as of the dates shown: September 30, 2019 (Dollars in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available-for-sale securities U.S. Treasury $ 220,756 $ 914 $ — $ 221,670 U.S. Government agencies 221,891 3,569 (1 ) 225,459 Municipal 141,311 4,896 (103 ) 146,104 Corporate notes: Financial issuers 97,058 126 (4,233 ) 92,951 Other 1,000 53 — 1,053 Mortgage-backed: (1) Mortgage-backed securities 1,529,749 18,682 (1,762 ) 1,546,669 Collateralized mortgage obligations 35,880 370 (97 ) 36,153 Total available-for-sale securities $ 2,247,645 $ 28,610 $ (6,196 ) $ 2,270,059 Held-to-maturity securities U.S. Government agencies $ 859,011 $ 3,310 $ (2,187 ) $ 860,134 Municipal 236,791 8,211 (233 ) 244,769 Total held-to-maturity securities $ 1,095,802 $ 11,521 $ (2,420 ) $ 1,104,903 Equity securities with readily determinable fair value $ 43,941 $ 2,794 $ (649 ) $ 46,086 December 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (Dollars in thousands) Available-for-sale securities U.S. Treasury $ 126,199 $ 391 $ (186 ) $ 126,404 U.S. Government agencies 139,420 917 (30 ) 140,307 Municipal 136,831 2,427 (768 ) 138,490 Corporate notes: Financial issuers 97,079 35 (7,069 ) 90,045 Other 1,000 — — 1,000 Mortgage-backed: (1) Mortgage-backed securities 1,641,146 2,510 (57,317 ) 1,586,339 Collateralized mortgage obligations 43,819 500 (823 ) 43,496 Total available-for-sale securities $ 2,185,494 $ 6,780 $ (66,193 ) $ 2,126,081 Held-to-maturity securities U.S. Government agencies $ 814,864 $ 1,141 $ (28,576 ) $ 787,429 Municipal 252,575 1,100 (5,008 ) 248,667 Total held-to-maturity securities $ 1,067,439 $ 2,241 $ (33,584 ) $ 1,036,096 Equity securities with readily determinable fair value $ 34,410 $ 1,532 $ (1,225 ) $ 34,717 (1) Consisting entirely of residential mortgage-backed securities, none of which are subprime. September 30, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (Dollars in thousands) Available-for-sale securities U.S. Treasury $ 125,153 $ — $ (392 ) $ 124,761 U.S. Government agencies 111,997 8 (985 ) 111,020 Municipal 133,006 1,481 (1,114 ) 133,373 Corporate notes: Financial issuers 97,085 87 (4,719 ) 92,453 Other 1,000 — — 1,000 Mortgage-backed: (1) Mortgage-backed securities 1,744,600 121 (87,950 ) 1,656,771 Collateralized mortgage obligations 47,909 4 (2,306 ) 45,607 Total available-for-sale securities $ 2,260,750 $ 1,701 $ (97,466 ) $ 2,164,985 Held-to-maturity securities U.S. Government agencies $ 713,423 $ — $ (47,706 ) $ 665,717 Municipal 253,015 629 (7,764 ) 245,880 Total held-to-maturity securities $ 966,438 $ 629 $ (55,470 ) $ 911,597 Equity securities with readily determinable fair value $ 33,512 $ 4,206 $ (1,304 ) $ 36,414 (1) Consisting entirely of residential mortgage-backed securities, none of which are subprime.
Investment Securities, Continuous Unrealized Loss Position, Fair Value	The following table presents the portion of the Company’s available-for-sale and held-to-maturity investment securities portfolios which has gross unrealized losses, reflecting the length of time that individual securities have been in a continuous unrealized loss position at September 30, 2019 : Continuous unrealized losses existing for less than 12 months Continuous unrealized losses existing for greater than 12 months Total (Dollars in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Available-for-sale securities U.S. Treasury $ — $ — $ — $ — $ — $ — U.S. Government agencies 1,950 (1 ) — — 1,950 (1 ) Municipal 5,505 (38 ) 1,532 (65 ) 7,037 (103 ) Corporate notes: Financial issuers 6,617 (377 ) 63,126 (3,856 ) 69,743 (4,233 ) Other — — — — — — Mortgage-backed: Mortgage-backed securities 778,842 (1,743 ) 1,243 (19 ) 780,085 (1,762 ) Collateralized mortgage obligations 1,598 (19 ) 5,798 (78 ) 7,396 (97 ) Total available-for-sale securities $ 794,512 $ (2,178 ) $ 71,699 $ (4,018 ) $ 866,211 $ (6,196 ) Held-to-maturity securities U.S. Government agencies $ 232,535 $ (2,186 ) $ 2,000 $ (1 ) $ 234,535 $ (2,187 ) Municipal 7,102 (39 ) 3,591 (194 ) 10,693 (233 ) Total held-to-maturity securities $ 239,637 $ (2,225 ) $ 5,591 $ (195 ) $ 245,228 $ (2,420 )
Schedule of Gross Gains and Losses on Investment Securities	The following table provides information as to the amount of gross gains and losses, adjustments and impairment on investment securities recognized in earnings and proceeds received through the sale or call of investment securities: Three months ended September 30, Nine months ended September 30, (Dollars in thousands) 2019 2018 2019 2018 Realized gains on investment securities $ 801 $ 1,051 $ 1,348 $ 1,057 Realized losses on investment securities (5 ) (50 ) (96 ) (1,051 ) Net realized gains on investment securities 796 $ 1,001 1,252 $ 6 Unrealized gains on equity securities with readily determinable fair value 165 530 2,299 2,632 Unrealized losses on equity securities with readily determinable fair value (251 ) (1,111 ) (460 ) (2,176 ) Net unrealized (losses) gains on equity securities with readily determinable fair value (86 ) (581 ) 1,839 456 Upward adjustments of equity securities without readily determinable fair values — — 110 156 Downward adjustments of equity securities without readily determinable fair values — — — — Impairment of equity securities without readily determinable fair values — (330 ) (263 ) (867 ) Adjustment and impairment, net, of equity securities without readily determinable fair values — (330 ) (153 ) (711 ) Other than temporary impairment charges — — — — Gains (losses) on investment securities, net $ 710 $ 90 $ 2,938 $ (249 ) Proceeds from sales of available-for-sale securities (1) $ 238,008 $ 649 $ 905,926 $ 209,640 Proceeds from sales of equity securities with readily determinable fair value 5,200 1,895 16,200 1,895 Proceeds from sales and capital distributions of equity securities without readily determinable fair value 852 64 1,461 680 (1) Includes proceeds from available-for-sale securities sold in accordance with written covered call options sold to a third party.
Investments Classified by Contractual Maturity Date	The amortized cost and fair value of available-for-sale and held-to-maturity investment securities as of September 30, 2019 , December 31, 2018 and September 30, 2018 , by contractual maturity, are shown in the following table. Contractual maturities may differ from actual maturities as borrowers may have the right to call or repay obligations with or without call or prepayment penalties. Mortgage-backed securities are not included in the maturity categories in the following maturity summary as actual maturities may differ from contractual maturities because the underlying mortgages may be called or prepaid without penalties: September 30, 2019 December 31, 2018 September 30, 2018 (Dollars in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Available-for-sale securities Due in one year or less $ 201,572 $ 201,866 $ 82,206 $ 82,153 $ 128,184 $ 127,844 Due in one to five years 141,319 143,804 168,855 169,307 174,968 174,877 Due in five to ten years 200,118 198,250 121,129 115,206 118,229 113,875 Due after ten years 139,007 143,317 128,339 129,580 46,860 46,011 Mortgage-backed 1,565,629 1,582,822 1,684,965 1,629,835 1,792,509 1,702,378 Total available-for-sale securities $ 2,247,645 $ 2,270,059 $ 2,185,494 $ 2,126,081 $ 2,260,750 $ 2,164,985 Held-to-maturity securities Due in one year or less $ 7,748 $ 7,749 $ 10,009 $ 9,979 $ 5,521 $ 5,511 Due in one to five years 28,138 28,335 29,436 28,995 31,782 31,160 Due in five to ten years 231,021 235,138 295,897 290,206 255,146 243,608 Due after ten years 828,895 833,681 732,097 706,916 673,989 631,318 Total held-to-maturity securities $ 1,095,802 $ 1,104,903 $ 1,067,439 $ 1,036,096 $ 966,438 $ 911,597

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2019
Loans and Leases Receivable Disclosure [Abstract]
Summary of Loan Portfolio	The following table shows the Company’s loan portfolio by category as of the dates shown: September 30, December 31, September 30, (Dollars in thousands) 2019 2018 2018 Balance: Commercial $ 8,195,602 $ 7,828,538 $ 7,473,958 Commercial real estate 7,448,667 6,933,252 6,746,774 Home equity 512,303 552,343 578,844 Residential real estate 1,218,666 1,002,464 924,250 Premium finance receivables—commercial 3,449,950 2,841,659 2,885,327 Premium finance receivables—life insurance 4,795,496 4,541,794 4,398,971 Consumer and other 89,487 120,641 115,827 Total loans, net of unearned income $ 25,710,171 $ 23,820,691 $ 23,123,951 Mix: Commercial 32 % 33 % 32 % Commercial real estate 29 29 29 Home equity 2 2 3 Residential real estate 5 4 4 Premium finance receivables—commercial 13 12 12 Premium finance receivables—life insurance 19 19 19 Consumer and other 0 1 1 Total loans, net of unearned income 100 % 100 % 100 %
Schedule of Unpaid Principal Balance and Carrying Value of Acquired Loans	The following table presents the unpaid principal balance and carrying value for these acquired loans: September 30, 2019 December 31, 2018 (In thousands) Unpaid Principal Balance Carrying Value Unpaid Carrying PCI loans $ 311,258 $ 286,009 $ 341,555 $ 318,394
Schedule of Loans Acquired with Deteriorated Credit Quality	The following table provides estimated details as of the date of acquisition on loans acquired during the first nine months of 2019 with evidence of credit quality deterioration since origination: (In thousands) ROC Contractually required payments including interest $ 27,510 Less: Nonaccretable difference 2,162 Cash flows expected to be collected (1) 25,348 Less: Accretable yield 1,874 Fair value of PCI loans acquired $ 23,474 (1) Represents undiscounted expected principal and interest cash at acquisition.
Activity Related to Accretable Yield of PCI Loans	The following table provides activity for the accretable yield of PCI loans: Three Months Ended Nine Months Ended (In thousands) September 30, September 30, September 30, September 30, Accretable yield, beginning balance $ 34,289 $ 34,347 $ 34,876 $ 36,565 Acquisitions — 2,321 1,874 2,321 Accretable yield amortized to interest income (4,266 ) (4,144 ) (12,179 ) (12,915 ) Reclassification from non-accretable difference (1) 184 1,734 2,190 4,596 Increases in interest cash flows due to payments and changes in interest rates 1,164 (1,093 ) 4,610 2,598 Accretable yield, ending balance $ 31,371 $ 33,165 $ 31,371 $ 33,165 (1) Reclassification is the result of subsequent increases in expected principal cash flows.

Allowance for Loan Losses, Al_2

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Tables)	9 Months Ended
	Sep. 30, 2019
Receivables [Abstract]
Schedule of Aging of the Company's Loan Portfolio	The tables below show the aging of the Company’s loan portfolio at September 30, 2019 , December 31, 2018 and September 30, 2018 : As of September 30, 2019 90+ days and still accruing 60-89 days past due 30-59 days past due (In thousands) Nonaccrual Current Total Loans Loan Balances: Commercial Commercial, industrial and other $ 34,397 $ — $ 2,296 $ 16,995 $ 5,096,879 $ 5,150,567 Franchise 3,752 — — 7,327 903,695 914,774 Mortgage warehouse lines of credit — — — 3,196 311,501 314,697 Asset-based lending 5,782 — 9,521 23,369 1,007,197 1,045,869 Leases — — — 393 753,770 754,163 PCI - commercial (1) — 382 1,043 207 13,900 15,532 Total commercial 43,931 382 12,860 51,487 8,086,942 8,195,602 Commercial real estate: Construction 1,030 — — 2,103 847,442 850,575 Land 994 — 88 4,947 169,357 175,386 Office 8,158 — 158 2,145 986,470 996,931 Industrial 100 — 950 961 1,007,669 1,009,680 Retail 7,174 — 2,235 3,684 991,627 1,004,720 Multi-family 690 — 1,073 2,265 1,287,797 1,291,825 Mixed use and other 3,411 — 928 10,084 1,987,844 2,002,267 PCI - commercial real estate (1) — 4,992 4,197 6,909 101,185 117,283 Total commercial real estate 21,557 4,992 9,629 33,098 7,379,391 7,448,667 Home equity 7,920 — 95 3,100 501,188 512,303 Residential real estate, including PCI 13,447 3,244 1,868 1,433 1,198,674 1,218,666 Premium finance receivables Commercial insurance loans 15,950 10,612 8,853 16,972 3,397,563 3,449,950 Life insurance loans 590 — 17,753 27,795 4,608,450 4,654,588 PCI - life insurance loans (1) — — — — 140,908 140,908 Consumer and other, including PCI 224 117 55 272 88,819 89,487 Total loans, net of unearned income $ 103,619 $ 19,347 $ 51,113 $ 134,157 $ 25,401,935 $ 25,710,171 (1) PCI loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. Loan agings are based upon contractually required payments. As of December 31, 2018 90+ days and still accruing 60-89 days past due 30-59 days past due (In thousands) Nonaccrual Current Total Loans Loan Balances: Commercial Commercial, industrial and other $ 34,298 $ — $ 1,451 $ 21,618 $ 5,062,729 $ 5,120,096 Franchise 16,051 — — 8,738 924,190 948,979 Mortgage warehouse lines of credit — — — — 144,199 144,199 Asset-based lending 635 — 200 3,156 1,022,065 1,026,056 Leases — — — 1,250 564,430 565,680 PCI - commercial (1) — 3,313 — 99 20,116 23,528 Total commercial 50,984 3,313 1,651 34,861 7,737,729 7,828,538 Commercial real estate Construction 1,554 — — 9,424 749,846 760,824 Land 107 — 170 107 141,097 141,481 Office 3,629 — 877 5,077 929,739 939,322 Industrial 285 — — 16,596 885,367 902,248 Retail 10,753 — 1,890 1,729 878,106 892,478 Multi-family 311 — 77 5,575 970,597 976,560 Mixed use and other 2,490 — 1,617 8,983 2,192,105 2,205,195 PCI - commercial real estate (1) — 6,241 6,195 4,075 98,633 115,144 Total commercial real estate 19,129 6,241 10,826 51,566 6,845,490 6,933,252 Home equity 7,147 — 131 3,105 541,960 552,343 Residential real estate, including PCI 16,383 1,292 1,692 6,171 976,926 1,002,464 Premium finance receivables Commercial insurance loans 11,335 7,799 11,382 15,085 2,796,058 2,841,659 Life insurance loans — — 8,407 24,628 4,340,856 4,373,891 PCI - life insurance loans (1) — — — — 167,903 167,903 Consumer and other, including PCI 348 227 87 733 119,246 120,641 Total loans, net of unearned income $ 105,326 $ 18,872 $ 34,176 $ 136,149 $ 23,526,168 $ 23,820,691 (1) PCI loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. Loan agings are based upon contractually required payments. As of September 30, 2018 90+ days and still accruing 60-89 days past due 30-59 days past due (In thousands) Nonaccrual Current Total Loans Loan Balances: Commercial Commercial, industrial and other $ 41,322 $ — $ 2,535 $ 16,451 $ 4,745,178 $ 4,805,486 Franchise 16,351 5,122 — — 915,817 937,290 Mortgage warehouse lines of credit — — 3,000 — 168,860 171,860 Asset-based lending 910 — 590 9,083 1,023,268 1,033,851 Leases 4 — — 80 509,591 509,675 PCI - commercial (1) — 3,372 15 — 12,409 15,796 Total commercial 58,587 8,494 6,140 25,614 7,375,123 7,473,958 Commercial real estate: Construction 1,554 — 1,823 16,228 778,725 798,330 Land 228 — 365 — 118,411 119,004 Office 1,532 — 4,058 3,021 932,166 940,777 Industrial 178 — 122 145 885,486 885,931 Retail 10,586 — 4,570 10,645 861,901 887,702 Multi-family 318 — — 1,162 922,413 923,893 Mixed use and other 3,119 — 9,654 11,503 2,062,179 2,086,455 PCI - commercial real estate (1) — 5,578 6,448 1,380 91,276 104,682 Total commercial real estate 17,515 5,578 27,040 44,084 6,652,557 6,746,774 Home equity 8,523 — 1,075 3,478 565,768 578,844 Residential real estate, including PCI 16,062 1,865 1,714 603 904,006 924,250 Premium finance receivables Commercial insurance loans 13,802 7,028 5,945 13,239 2,845,313 2,885,327 Life insurance loans — — — 22,016 4,203,465 4,225,481 PCI - life insurance loans (1) — — — — 173,490 173,490 Consumer and other, including PCI 355 295 430 329 114,418 115,827 Total loans, net of unearned income $ 114,844 $ 23,260 $ 42,344 $ 109,363 $ 22,834,140 $ 23,123,951 (1) PCI loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. Loan agings are based upon contractually required payments.
Summary of Performance by Loan Class	The following table presents the recorded investment based on performance of loans by class, per the most recent analysis at September 30, 2019 , December 31, 2018 and September 30, 2018 : Performing Non-performing Total (In thousands) September 30, December 31, September 30, September 30, December 31, September 30, September 30, December 31, September 30, Loan Balances: Commercial Commercial, industrial and other $ 5,116,170 $ 5,085,798 $ 4,764,164 $ 34,397 $ 34,298 $ 41,322 $ 5,150,567 $ 5,120,096 $ 4,805,486 Franchise 911,022 932,928 915,817 3,752 16,051 21,473 914,774 948,979 937,290 Mortgage warehouse lines of credit 314,697 144,199 171,860 — — — 314,697 144,199 171,860 Asset-based lending 1,040,087 1,025,421 1,032,941 5,782 635 910 1,045,869 1,026,056 1,033,851 Leases 754,163 565,680 509,671 — — 4 754,163 565,680 509,675 PCI - commercial (1) 15,532 23,528 15,796 — — — 15,532 23,528 15,796 Total commercial 8,151,671 7,777,554 7,410,249 43,931 50,984 63,709 8,195,602 7,828,538 7,473,958 Commercial real estate Construction 849,545 759,270 796,776 1,030 1,554 1,554 850,575 760,824 798,330 Land 174,392 141,374 118,776 994 107 228 175,386 141,481 119,004 Office 988,773 935,693 939,245 8,158 3,629 1,532 996,931 939,322 940,777 Industrial 1,009,580 901,963 885,753 100 285 178 1,009,680 902,248 885,931 Retail 997,546 881,725 877,116 7,174 10,753 10,586 1,004,720 892,478 887,702 Multi-family 1,291,135 976,249 923,575 690 311 318 1,291,825 976,560 923,893 Mixed use and other 1,998,856 2,202,705 2,083,336 3,411 2,490 3,119 2,002,267 2,205,195 2,086,455 PCI - commercial real estate (1) 117,283 115,144 104,682 — — — 117,283 115,144 104,682 Total commercial real estate 7,427,110 6,914,123 6,729,259 21,557 19,129 17,515 7,448,667 6,933,252 6,746,774 Home equity 504,383 545,196 570,321 7,920 7,147 8,523 512,303 552,343 578,844 Residential real estate, including PCI 1,205,219 986,081 908,188 13,447 16,383 16,062 1,218,666 1,002,464 924,250 Premium finance receivables Commercial insurance loans 3,423,388 2,822,525 2,864,497 26,562 19,134 20,830 3,449,950 2,841,659 2,885,327 Life insurance loans 4,653,998 4,373,891 4,225,481 590 — — 4,654,588 4,373,891 4,225,481 PCI - life insurance loans (1) 140,908 167,903 173,490 — — — 140,908 167,903 173,490 Consumer and other, including PCI 89,210 120,184 115,239 277 457 588 89,487 120,641 115,827 Total loans, net of unearned income $ 25,595,887 $ 23,707,457 $ 22,996,724 $ 114,284 $ 113,234 $ 127,227 $ 25,710,171 $ 23,820,691 $ 23,123,951 (1) PCI loans represent loans acquired with evidence of credit quality deterioration since origination, in accordance with ASC 310-30. See Note 6 - Loans for further discussion of these purchased loans.
Summary of Activity in the Allowance for Credit Losses	A summary of activity in the allowance for credit losses by loan portfolio for the three and nine months ended September 30, 2019 and 2018 is as follows: Three months ended September 30, 2019 Commercial Real Estate Home Equity Residential Real Estate Premium Finance Receivables Consumer and Other Total Loans (In thousands) Commercial Allowance for credit losses Allowance for loan losses at beginning of period $ 74,893 $ 63,270 $ 3,631 $ 8,146 $ 8,940 $ 1,541 $ 160,421 Other adjustments — — — — (13 ) — (13 ) Reclassification from allowance for unfunded lending-related commitments — (30 ) — — — — (30 ) Charge-offs (6,775 ) (809 ) (1,594 ) (25 ) (1,866 ) (117 ) (11,186 ) Recoveries 367 385 183 203 563 36 1,737 Provision for credit losses 4,642 2,122 1,500 1,087 1,742 (259 ) 10,834 Allowance for loan losses at period end $ 73,127 $ 64,938 $ 3,720 $ 9,411 $ 9,366 $ 1,201 $ 161,763 Allowance for unfunded lending-related commitments at period end $ — $ 1,510 $ — $ — $ — $ — $ 1,510 Allowance for credit losses at period end $ 73,127 $ 66,448 $ 3,720 $ 9,411 $ 9,366 $ 1,201 $ 163,273 Individually evaluated for impairment $ 10,606 $ 3,600 $ 313 $ 315 $ — $ 106 $ 14,940 Collectively evaluated for impairment 62,160 62,795 3,407 9,037 9,366 1,095 147,860 Loans acquired with deteriorated credit quality 361 53 — 59 — — 473 Loans at period end Individually evaluated for impairment $ 58,030 $ 32,155 $ 18,702 $ 21,889 $ — $ 274 $ 131,050 Collectively evaluated for impairment 8,122,040 7,299,229 493,601 1,070,795 8,104,538 86,887 25,177,090 Loans acquired with deteriorated credit quality 15,532 117,283 — 9,960 140,908 2,326 286,009 Loans held at fair value — — — 116,022 — — 116,022 Three months ended September 30, 2018 Commercial Commercial Real Estate Home Equity Residential Real Estate Premium Finance Receivables Consumer and Other Total Loans (In thousands) Allowance for credit losses Allowance for loan losses at beginning of period $ 60,727 $ 57,660 $ 9,551 $ 6,336 $ 7,734 $ 1,394 $ 143,402 Other adjustments (1 ) (15 ) (2 ) (14 ) 14 — (18 ) Reclassification from allowance for unfunded lending-related commitments — (2 ) — — — — (2 ) Charge-offs (3,219 ) (208 ) (561 ) (337 ) (2,512 ) (144 ) (6,981 ) Recoveries 304 193 142 466 1,142 66 2,313 Provision for credit losses 8,934 619 13 (160 ) 1,796 (160 ) 11,042 Allowance for loan losses at period end $ 66,745 $ 58,247 $ 9,143 $ 6,291 $ 8,174 $ 1,156 $ 149,756 Allowance for unfunded lending-related commitments at period end $ — $ 1,245 $ — $ — $ — $ — $ 1,245 Allowance for credit losses at period end $ 66,745 $ 59,492 $ 9,143 $ 6,291 $ 8,174 $ 1,156 $ 151,001 Individually evaluated for impairment $ 10,164 $ 3,158 $ 611 $ 325 $ — $ 117 $ 14,375 Collectively evaluated for impairment 55,987 56,316 8,532 5,894 8,174 1,039 135,942 Loans acquired with deteriorated credit quality 594 18 — 72 — — 684 Loans at period end Individually evaluated for impairment $ 67,381 $ 31,952 $ 11,284 $ 21,781 $ — $ 401 $ 132,799 Collectively evaluated for impairment 7,390,781 6,610,140 567,560 815,442 7,110,808 113,812 22,608,543 Loans acquired with deteriorated credit quality 15,796 104,682 — 9,144 173,490 1,614 304,726 Loans held at fair value — — — 77,883 — — 77,883 Nine months ended September 30, 2019 Commercial Real Estate Home Equity Residential Real Estate Premium Finance Receivable Consumer and Other Total Loans (In thousands) Commercial Allowance for credit losses Allowance for loan losses at beginning of period $ 67,826 $ 60,267 $ 8,507 $ 7,194 $ 7,715 $ 1,261 $ 152,770 Other adjustments — (35 ) (20 ) (15 ) 19 — (51 ) Reclassification from allowance for unfunded lending-related commitments — (116 ) — — — — (116 ) Charge-offs (24,658 ) (4,869 ) (2,372 ) (315 ) (9,085 ) (355 ) (41,654 ) Recoveries 974 1,112 313 372 1,853 152 4,776 Provision for credit losses 28,985 8,579 (2,708 ) 2,175 8,864 143 46,038 Allowance for loan losses at period end $ 73,127 $ 64,938 $ 3,720 $ 9,411 $ 9,366 $ 1,201 $ 161,763 Allowance for unfunded lending-related commitments at period end $ — $ 1,510 $ — $ — $ — $ — $ 1,510 Allowance for credit losses at period end $ 73,127 $ 66,448 $ 3,720 $ 9,411 $ 9,366 $ 1,201 $ 163,273 Nine months ended September 30, 2018 Commercial Real Estate Home Equity Residential Real Estate Premium Finance Receivable Consumer and Other Total Loans (In thousands) Commercial Allowance for credit losses Allowance for loan losses at beginning of period $ 57,811 $ 55,227 $ 10,493 $ 6,688 $ 6,846 $ 840 $ 137,905 Other adjustments (3 ) (66 ) (2 ) (19 ) (12 ) — (102 ) Reclassification from allowance for unfunded lending-related commitments — 24 — — — — 24 Charge-offs (8,116 ) (1,176 ) (1,530 ) (1,088 ) (10,487 ) (732 ) (23,129 ) Recoveries 1,232 4,267 436 2,028 2,502 162 10,627 Provision for credit losses 15,821 (29 ) (254 ) (1,318 ) 9,325 886 24,431 Allowance for loan losses at period end $ 66,745 $ 58,247 $ 9,143 $ 6,291 $ 8,174 $ 1,156 $ 149,756 Allowance for unfunded lending-related commitments at period end $ — $ 1,245 $ — $ — $ — $ — $ 1,245 Allowance for credit losses at period end $ 66,745 $ 59,492 $ 9,143 $ 6,291 $ 8,174 $ 1,156 $ 151,001
Summary of Impaired Loans, Including Restructured Loans	A summary of impaired loans, including troubled debt restructurings ("TDRs"), is as follows: September 30, December 31, September 30, (In thousands) 2019 2018 2018 Impaired loans (included in non-performing and TDRs): Impaired loans with an allowance for loan loss required (1) $ 52,485 $ 60,219 $ 83,349 Impaired loans with no allowance for loan loss required 78,338 67,050 49,173 Total impaired loans (2) $ 130,823 $ 127,269 $ 132,522 Allowance for loan losses related to impaired loans $ 14,934 $ 11,437 $ 14,365 TDRs $ 66,308 $ 66,102 $ 66,219 (1) These impaired loans require an allowance for loan losses because the estimated fair value of the loans or related collateral is less than the recorded investment in the loans. (2) Impaired loans are considered by the Company to be non-accrual loans, TDRs or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest.
Summary of Impaired Loans by Loan Class	The following tables present impaired loans by loan class for the periods ended as follows: For the Nine Months Ended As of September 30, 2019 September 30, 2019 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (In thousands) Impaired loans with a related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 20,281 $ 20,536 $ 10,606 $ 20,411 $ 1,011 Franchise — — — — — Mortgage warehouse lines of credit — — — — — Asset-based lending 130 130 — 130 6 Leases 1,585 1,585 — 1,651 62 Commercial real estate Construction — — — — — Land — — — — — Office 8,043 8,190 3,470 8,114 283 Industrial — — — — — Retail 5,029 5,029 32 5,076 171 Multi-family 1,168 1,168 25 1,178 39 Mixed use and other 774 821 67 813 30 Home equity 8,374 8,969 313 8,534 251 Residential real estate 6,995 7,261 315 7,061 188 Consumer and other 106 124 106 110 5 Impaired loans with no related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 25,804 $ 30,152 $ — $ 29,361 $ 1,769 Franchise 3,752 10,083 — 11,857 715 Asset-based lending 5,782 6,164 — 5,457 215 Leases 696 733 — 761 36 Commercial real estate Construction 1,030 1,554 — 1,146 65 Land 994 1,303 — 1,184 54 Office 662 679 — 667 31 Industrial 105 218 — 122 9 Retail 7,507 10,993 — 8,307 437 Multi-family 690 797 — 704 23 Mixed use and other 5,926 6,189 — 6,091 275 Home equity 10,328 12,132 — 10,709 465 Residential real estate 14,894 17,309 — 15,259 595 Consumer and other 168 325 — 190 11 Total impaired loans, net of unearned income $ 130,823 $ 152,444 $ 14,934 $ 144,893 $ 6,746 For the Twelve Months Ended As of December 31, 2018 December 31, 2018 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (In thousands) Impaired loans with a related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 16,703 $ 17,029 $ 4,866 $ 17,868 $ 1,181 Franchise 16,021 16,256 1,375 16,221 909 Mortgage warehouse lines of credit — — — — — Asset-based lending 557 557 317 689 50 Leases 1,730 1,730 — 1,812 91 Commercial real estate Construction 1,554 1,554 550 1,554 76 Land — — — — — Office 573 638 21 587 25 Industrial — — — — — Retail 14,633 14,633 3,413 14,694 676 Multi-family — — — — — Mixed use and other 1,188 1,221 293 1,354 66 Home equity 3,133 3,470 282 3,165 131 Residential real estate 4,011 4,263 204 4,056 159 Consumer and other 116 129 116 119 7 Impaired loans with no related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 18,314 $ 21,501 $ — $ 20,547 $ 1,143 Franchise 5,152 5,154 — 5,320 403 Asset-based lending 207 601 — 569 51 Leases 845 879 — 936 56 Commercial real estate Construction 1,117 1,117 — 1,218 52 Land 3,396 3,491 — 3,751 198 Office 3,629 3,642 — 3,651 184 Industrial 322 450 — 363 30 Retail 1,592 1,945 — 1,699 110 Multi-family 1,498 1,595 — 1,529 55 Mixed use and other 3,522 3,836 — 3,611 227 Home equity 9,122 12,383 — 9,323 564 Residential real estate 18,053 20,765 — 18,552 883 Consumer and other 281 407 — 293 20 Total impaired loans, net of unearned income $ 127,269 $ 139,246 $ 11,437 $ 133,481 $ 7,347 For the Nine Months Ended As of September 30, 2018 September 30, 2018 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (In thousands) Impaired loans with a related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 36,564 $ 36,699 $ 8,242 $ 30,259 $ 1,404 Franchise 16,316 18,504 1,638 18,387 771 Asset-based lending 646 646 283 724 39 Leases 1,777 1,777 1 1,836 69 Commercial real estate Construction 1,554 1,554 390 1,554 56 Land 1,375 1,375 1 1,508 53 Office 579 647 26 591 19 Industrial 45 154 1 56 6 Retail 15,325 15,567 2,413 15,376 535 Multi-family 1,197 1,197 8 1,209 32 Mixed use and other 1,590 1,801 309 1,754 76 Home equity 2,287 2,651 611 2,303 78 Residential real estate 3,977 4,291 325 3,998 128 Consumer and other 117 130 117 119 5 Impaired loans with no related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 5,758 $ 7,022 $ — $ 9,325 $ 465 Franchise 5,157 5,158 — 5,376 302 Asset-based lending 264 1,088 — 1,623 89 Leases 899 930 — 974 43 Commercial real estate Construction 1,117 1,117 — 1,252 40 Land 2,325 2,431 — 2,366 98 Office 1,532 2,077 — 1,541 86 Industrial 178 195 — 188 9 Retail 777 946 — 874 42 Multi-family 318 412 — 329 9 Mixed use and other 3,763 4,362 — 3,950 194 Home equity 8,997 12,131 — 9,015 462 Residential real estate 17,804 20,291 — 18,193 643 Consumer and other 284 408 — 295 15 Total impaired loans, net of unearned income $ 132,522 $ 145,561 $ 14,365 $ 134,975 $ 5,768
Summary of the Post-Modification Balance of TDRs and Loans Restructured in TDRs	The tables below present a summary of the post-modification balance of loans restructured during the three and nine months ended September 30, 2019 and 2018 , respectively, which represent TDRs: Three months ended September 30, 2019 (Dollars in thousands) Total (1)(2) Extension at Below Market (2) Reduction of Interest Rate (2) Modification to Interest-only Payments (2) Forgiveness of Debt (2) Count Balance Count Balance Count Balance Count Balance Count Balance Commercial Commercial, industrial and other 5 $ 3,526 2 $ 2,721 — $ — 3 $ 807 — $ — Commercial real estate Office 1 5,070 1 5,070 — — 1 5,070 — — Mixed use and other 2 122 1 122 — — 1 121 — — Residential real estate and other 60 4,879 59 4,568 9 1,048 1 311 — — Total loans 68 $ 13,597 63 $ 12,481 9 $ 1,048 6 $ 6,309 — $ — Three months ended September 30, 2018 (Dollars in thousands) Total (1)(2) Extension at Below Market Terms (2) Reduction of Interest Rate (2) Modification to Interest-only Payments (2) Forgiveness of Debt (2) Count Balance Count Balance Count Balance Count Balance Count Balance Commercial Commercial, industrial and other 1 $ 519 1 $ 519 — $ — — $ — — $ — Franchise 1 35 1 35 — — — — — — Leases — — — — — — — — — — Commercial real estate Mixed use and other — — — — — — — — — — Residential real estate and other 20 3,679 20 3,679 7 621 — — — — Total loans 22 $ 4,233 22 $ 4,233 7 $ 621 — $ — — $ — (1) TDRs may have more than one modification representing a concession. As such, TDRs during the period may be represented in more than one of the categories noted above. (2) Balances represent the recorded investment in the loan at the time of the restructuring. The following table presents a summary of all loans restructured in TDRs during the twelve months ended September 30, 2019 and 2018 , and such loans which were in payment default under the restructured terms during the respective periods below: (Dollars in thousands) As of September 30, 2019 Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Total (1)(3) Payments in Default (2)(3) Payments in Default (2)(3) Count Balance Count Balance Count Balance Commercial Commercial, industrial and other 18 $ 24,835 3 $ 1,743 6 $ 13,348 Asset-based lending 2 206 2 206 2 206 Commercial real estate Office 2 5,382 1 312 1 312 Mixed use and other 5 1,755 1 370 2 672 Residential real estate and other 130 19,041 11 3,914 12 4,154 Total loans 157 $ 51,219 18 $ 6,545 23 $ 18,692 (Dollars in thousands) As of September 30, 2018 Three Months Ended September 30, 2018 Nine Months Ended September 30, 2018 Total (1)(3) Payments in Default (2)(3) Payments in Default (2)(3) Count Balance Count Balance Count Balance Commercial Commercial, industrial and other 5 $ 15,714 3 $ 2,447 3 $ 2,447 Franchise 6 21,413 2 5,122 2 5,122 Leases 1 239 — — — — Commercial real estate Office 1 59 — — — — Mixed use and other 1 85 1 85 1 85 Residential real estate and other 35 6,257 7 1,457 7 1,457 Total loans 49 $ 43,767 13 $ 9,111 13 $ 9,111 (1) Total TDRs represent all loans restructured in TDRs during the previous twelve months from the date indicated. (2) TDRs considered to be in payment default are over 30 days past-due subsequent to the restructuring. (3) Balances represent the recorded investment in the loan at the time of the restructuring. Nine months ended September 30, 2019 Total (1)(2) Extension at (2) Reduction of Interest (2) Modification to (2) Forgiveness of Debt (2) Count Balance Count Balance Count Balance Count Balance Count Balance Commercial Commercial, industrial and other 18 $ 24,835 8 $ 5,608 1 $ 550 12 $ 20,723 — $ — Asset based lending 1 76 1 76 — — — — — — Commercial real estate Office 2 5,382 2 5,382 — — 1 5,070 — — Mixed use and other 4 1,385 3 1,083 — — 2 423 — — Residential real estate and other 102 15,126 101 14,815 24 4,537 1 311 — — Total loans 127 $ 46,804 115 $ 26,964 25 $ 5,087 16 $ 26,527 — $ — Nine months ended September 30, 2018 (Dollars in thousands) Total (1)(2) Extension at (2) Reduction of Interest (2) Modification to (2) Forgiveness of Debt (2) Count Balance Count Balance Count Balance Count Balance Count Balance Commercial Commercial, industrial and other 4 $ 13,442 3 $ 692 — $ — 1 $ 12,750 — $ — Franchise 3 5,157 1 35 — — 2 5,122 — — Leases 1 239 1 239 — — — — — — Commercial real estate Office 1 59 1 59 — — — — — — Mixed use and other 1 85 1 85 1 85 — — — — Residential real estate and other 31 5,846 31 5,846 12 1,417 — — — — Total loans 41 $ 24,828 38 $ 6,956 13 $ 1,502 3 $ 17,872 — $ — (1) TDRs may have more than one modification representing a concession. As such, TDRs during the period may be represented in more than one of the categories noted above. (2) Balances represent the recorded investment in the loan at the time of the restructuring.

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill Assets by Business Segment	A summary of the Company’s goodwill assets by business segment is presented in the following table: (Dollars in thousands) January 1, 2019 Goodwill Acquired Impairment Loss Goodwill Adjustments September 30, Community banking $ 465,085 $ 10,726 $ — $ 123 $ 475,934 Specialty finance 38,343 — — 665 39,008 Wealth management 69,713 — — (340 ) 69,373 Total $ 573,141 $ 10,726 $ — $ 448 $ 584,315
Summary of Intangible Assets	A summary of intangible assets as of the dates shown and the expected amortization of finite-lived intangible assets as of September 30, 2019 is as follows: (Dollars in thousands) September 30, December 31, September 30, Community banking segment: Core deposit intangibles with finite lives: Gross carrying amount $ 48,791 $ 55,366 $ 44,395 Accumulated amortization (24,628 ) (29,406 ) (28,142 ) Net carrying amount $ 24,163 $ 25,960 $ 16,253 Trademark with indefinite lives: Carrying amount 5,800 5,800 5,800 Total net carrying amount $ 29,963 $ 31,760 $ 22,053 Specialty finance segment: Customer list intangibles with finite lives: Gross carrying amount $ 1,962 $ 1,958 $ 1,967 Accumulated amortization (1,526 ) (1,436 ) (1,407 ) Net carrying amount $ 436 $ 522 $ 560 Wealth management segment: Customer list and other intangibles with finite lives: Gross carrying amount $ 20,430 $ 20,430 $ 7,940 Accumulated amortization (7,172 ) (3,288 ) (3,175 ) Net carrying amount $ 13,258 $ 17,142 $ 4,765 Total intangible assets: Gross carrying amount $ 76,983 $ 83,554 $ 60,102 Accumulated amortization (33,326 ) (34,130 ) (32,724 ) Total intangible assets, net $ 43,657 $ 49,424 $ 27,378
Summary of Intangible Assets	A summary of intangible assets as of the dates shown and the expected amortization of finite-lived intangible assets as of September 30, 2019 is as follows: (Dollars in thousands) September 30, December 31, September 30, Community banking segment: Core deposit intangibles with finite lives: Gross carrying amount $ 48,791 $ 55,366 $ 44,395 Accumulated amortization (24,628 ) (29,406 ) (28,142 ) Net carrying amount $ 24,163 $ 25,960 $ 16,253 Trademark with indefinite lives: Carrying amount 5,800 5,800 5,800 Total net carrying amount $ 29,963 $ 31,760 $ 22,053 Specialty finance segment: Customer list intangibles with finite lives: Gross carrying amount $ 1,962 $ 1,958 $ 1,967 Accumulated amortization (1,526 ) (1,436 ) (1,407 ) Net carrying amount $ 436 $ 522 $ 560 Wealth management segment: Customer list and other intangibles with finite lives: Gross carrying amount $ 20,430 $ 20,430 $ 7,940 Accumulated amortization (7,172 ) (3,288 ) (3,175 ) Net carrying amount $ 13,258 $ 17,142 $ 4,765 Total intangible assets: Gross carrying amount $ 76,983 $ 83,554 $ 60,102 Accumulated amortization (33,326 ) (34,130 ) (32,724 ) Total intangible assets, net $ 43,657 $ 49,424 $ 27,378
Estimated Amortization	Estimated amortization Actual in nine months ended September 30, 2019 $ 8,828 Estimated remaining in 2019 2,844 Estimated—2020 10,105 Estimated—2021 6,852 Estimated—2022 5,368 Estimated—2023 3,977

Mortgage Servicing Rights ("M_2

Mortgage Servicing Rights ("MSRs") (Tables)	9 Months Ended
	Sep. 30, 2019
Disclosures Pertaining to Servicing Assets and Servicing Liabilities [Abstract]
Schedule of Servicing Assets at Fair Value	The following is a summary of the changes in the carrying value of MSRs, accounted for at fair value, for the periods indicated: Three Months Ended Nine Months Ended September 30, September 30, September 30, September 30, (In thousands) 2019 2018 2019 2018 Balance at beginning of the period $ 72,850 $ 63,194 $ 75,183 $ 33,676 Additions from loans sold with servicing retained 14,029 11,340 30,411 23,388 Additions from acquisitions — — 407 13,806 Estimate of changes in fair value due to: Payoffs and paydowns (7,236 ) (1,081 ) (13,309 ) (3,647 ) Changes in valuation inputs or assumptions (4,058 ) 1,077 (17,107 ) 7,307 Fair value at end of the period $ 75,585 $ 74,530 $ 75,585 $ 74,530 Unpaid principal balance of mortgage loans serviced for others $ 7,901,045 $ 5,904,300

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Sep. 30, 2019
Deposits [Abstract]
Summary of Deposits	The following table is a summary of deposits as of the dates shown: (Dollars in thousands) September 30, December 31, September 30, Balance: Non-interest bearing $ 7,067,960 $ 6,569,880 $ 6,399,213 NOW and interest bearing demand deposits 2,966,098 2,897,133 2,512,259 Wealth management deposits 2,795,838 2,996,764 2,520,120 Money market 7,326,899 5,704,866 5,429,921 Savings 2,934,348 2,665,194 2,595,164 Time certificates of deposit 5,619,236 5,260,841 5,460,038 Total deposits $ 28,710,379 $ 26,094,678 $ 24,916,715 Mix: Non-interest bearing 25 % 25 % 26 % NOW and interest bearing demand deposits 10 11 10 Wealth management deposits 10 12 10 Money market 25 22 22 Savings 10 10 10 Time certificates of deposit 20 20 22 Total deposits 100 % 100 % 100 %

FHLB Advances, Other Borrowin_2

FHLB Advances, Other Borrowings and Subordinated Notes (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Summary of Debt	The following table is a summary of FHLB advances, other borrowings and subordinated notes as of the dates shown: (In thousands) September 30, December 31, September 30, FHLB advances $ 574,847 $ 426,326 $ 615,000 Other borrowings: Notes payable 128,433 144,461 149,799 Short-term borrowings 9,677 50,593 17,431 Other 46,774 47,722 48,043 Secured borrowings 225,604 151,079 158,298 Total other borrowings 410,488 393,855 373,571 Subordinated notes 435,979 139,210 139,172 Total FHLB advances, other borrowings and subordinated notes $ 1,421,314 $ 959,391 $ 1,127,743
Summary of Pledged Securities Related to Securities Sold Under Repurchase Agreements	The following is a summary of these securities pledged as of September 30, 2019 disaggregated by investment category and maturity of the related customer sweep account, and reconciled to the outstanding balance of securities sold under repurchase agreements: (In thousands) Overnight Sweep Collateral Available-for-sale securities pledged Mortgage-backed securities $ 4,431 Collateralized mortgage obligations 2,847 Held-to-maturity securities pledged U.S. Government agencies 13,000 Total collateral pledged $ 20,278 Excess collateral 10,601 Securities sold under repurchase agreements $ 9,677

Junior Subordinated Debentures

Junior Subordinated Debentures (Tables)	9 Months Ended
	Sep. 30, 2019
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [Abstract]
Summary of Junior Subordinated Debentures	The following table provides a summary of the Company’s junior subordinated debentures as of September 30, 2019 . The junior subordinated debentures represent the par value of the obligations owed to the Trusts. (Dollars in thousands) Common Securities Trust Preferred Securities Junior Subordinated Debentures Rate Structure Contractual rate at 9/30/2019 Issue Date Maturity Date Earliest Redemption Date Wintrust Capital Trust III $ 774 $ 25,000 $ 25,774 L+3.25 5.55 % 04/2003 04/2033 04/2008 Wintrust Statutory Trust IV 619 20,000 20,619 L+2.80 4.90 % 12/2003 12/2033 12/2008 Wintrust Statutory Trust V 1,238 40,000 41,238 L+2.60 4.70 % 05/2004 05/2034 06/2009 Wintrust Capital Trust VII 1,550 50,000 51,550 L+1.95 4.07 % 12/2004 03/2035 03/2010 Wintrust Capital Trust VIII 1,238 25,000 26,238 L+1.45 3.55 % 08/2005 09/2035 09/2010 Wintrust Capital Trust IX 1,547 50,000 51,547 L+1.63 3.75 % 09/2006 09/2036 09/2011 Northview Capital Trust I 186 6,000 6,186 L+3.00 5.25 % 08/2003 11/2033 08/2008 Town Bankshares Capital Trust I 186 6,000 6,186 L+3.00 5.25 % 08/2003 11/2033 08/2008 First Northwest Capital Trust I 155 5,000 5,155 L+3.00 5.10 % 05/2004 05/2034 05/2009 Suburban Illinois Capital Trust II 464 15,000 15,464 L+1.75 3.87 % 12/2006 12/2036 12/2011 Community Financial Shares Statutory Trust II 109 3,500 3,609 L+1.62 3.74 % 06/2007 09/2037 06/2012 Total $ 253,566 4.33 %

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue by Source	The following table presents revenue from contracts with customers, disaggregated by the revenue source: (Dollars in thousands) Three Months Ended Nine Months Ended Revenue from contracts with customers Location in income statement September 30, September 30, September 30, September 30, Brokerage and insurance product commissions Wealth management $ 4,686 $ 5,579 $ 13,966 $ 17,394 Trust Wealth management 4,399 3,003 14,366 9,646 Asset management Wealth management 14,914 14,052 43,783 41,197 Total wealth management 23,999 22,634 72,115 68,237 Mortgage broker fees Mortgage banking 235 295 608 862 Service charges on deposit accounts Service charges on deposit accounts 9,972 9,331 28,097 27,339 Administrative services Other non-interest income 1,086 1,099 3,125 3,365 Card related fees Other non-interest income 2,220 2,328 6,932 5,583 Other deposit related fees Other non-interest income 3,322 3,035 9,404 8,927 Total revenue from contracts with customers $ 40,834 $ 38,722 $ 120,281 $ 114,313
Contract Assets, Contract Liabilities and Receivables from Contracts with Customers	The following table provides information about contract assets, contract liabilities and receivables from contracts with customers: (Dollars in thousands) September 30, December 31, September 30, Contract assets $ — $ — $ — Contract liabilities $ 1,429 $ 1,727 $ 1,429 Mortgage broker fees receivable $ 23 $ 44 $ 9 Administrative services receivable 222 275 2,425 Wealth management receivable 9,285 13,610 7,779 Card related fees receivable 114 — — Total receivables from contracts with customer $ 9,644 $ 13,929 $ 10,213
Performance Obligations Unsatisfied at End of Period	These upfront fees represent performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period. (Dollars in thousands) Estimated remaining in 2019 $ 277 Estimated—2020 553 Estimated—2021 303 Estimated—2022 153 Estimated—2023 143 Estimated—2024 — Total $ 1,429

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Summary of Segment Information	The following is a summary of certain operating information for reportable segments: Three months ended $ Change in Contribution % Change in Contribution (Dollars in thousands) September 30, September 30, Net interest income: Community Banking $ 209,912 $ 202,435 $ 7,477 4 % Specialty Finance 42,138 36,398 5,740 16 Wealth Management 7,290 4,048 3,242 80 Total Operating Segments 259,340 242,881 16,459 7 Intersegment Eliminations 5,512 4,682 830 18 Consolidated net interest income $ 264,852 $ 247,563 $ 17,289 7 % Non-interest income: Community Banking $ 82,870 $ 69,776 $ 13,094 19 % Specialty Finance 20,003 16,963 3,040 18 Wealth Management 24,422 23,535 887 4 Total Operating Segments 127,295 110,274 17,021 15 Intersegment Eliminations (12,158 ) (10,344 ) (1,814 ) (18 ) Consolidated non-interest income $ 115,137 $ 99,930 $ 15,207 15 % Net revenue: Community Banking $ 292,782 $ 272,211 $ 20,571 8 % Specialty Finance 62,141 53,361 8,780 16 Wealth Management 31,712 27,583 4,129 15 Total Operating Segments 386,635 353,155 33,480 9 Intersegment Eliminations (6,646 ) (5,662 ) (984 ) (17 ) Consolidated net revenue $ 379,989 $ 347,493 $ 32,496 9 % Segment profit: Community Banking $ 68,792 $ 63,735 $ 5,057 8 % Specialty Finance 24,241 22,971 1,270 6 Wealth Management 6,088 5,242 846 16 Consolidated net income $ 99,121 $ 91,948 $ 7,173 8 % Segment assets: Community Banking $ 28,092,785 $ 24,590,027 $ 3,502,758 14 % Specialty Finance 5,739,798 4,897,664 842,134 17 Wealth Management 1,079,319 655,040 424,279 65 Consolidated total assets $ 34,911,902 $ 30,142,731 $ 4,769,171 16 % Nine months ended $ Change in Contribution % Change in Contribution (Dollars in thousands) September 30, September 30, Net interest income: Community Banking $ 635,645 $ 583,926 $ 51,719 9 % Specialty Finance 119,241 100,104 19,137 19 Wealth Management 21,728 12,729 8,999 71 Total Operating Segments 776,614 696,759 79,855 11 Intersegment Eliminations 16,426 14,056 2,370 17 Consolidated net interest income $ 793,040 $ 710,815 $ 82,225 12 % Non-interest income: Community Banking $ 196,507 $ 192,028 $ 4,479 2 % Specialty Finance 59,188 49,005 10,183 21 Wealth Management 74,407 69,789 4,618 7 Total Operating Segments 330,102 310,822 19,280 6 Intersegment Eliminations (35,150 ) (29,980 ) (5,170 ) (17 ) Consolidated non-interest income $ 294,952 $ 280,842 $ 14,110 5 % Net revenue: Community Banking $ 832,152 $ 775,954 $ 56,198 7 % Specialty Finance 178,429 149,109 29,320 20 Wealth Management 96,135 82,518 13,617 17 Total Operating Segments 1,106,716 1,007,581 99,135 10 Intersegment Eliminations (18,724 ) (15,924 ) (2,800 ) (18 ) Consolidated net revenue $ 1,087,992 $ 991,657 $ 96,335 10 % Segment profit: Community Banking $ 182,553 $ 187,395 $ (4,842 ) (3 )% Specialty Finance 67,218 61,482 5,736 9 Wealth Management 19,962 14,632 5,330 36 Consolidated net income $ 269,733 $ 263,509 $ 6,224 2 %

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule Of Fair Value Of Derivative Financial Instruments	The table below presents the fair value of the Company’s derivative financial instruments as of September 30, 2019 , December 31, 2018 and September 30, 2018 : Derivative Assets Derivative Liabilities (In thousands) September 30, December 31, September 30, September 30, December 31, September 30, Derivatives designated as hedging instruments under ASC 815: Interest rate derivatives designated as Cash Flow Hedges $ — $ 6,270 $ 16,271 $ 25,895 $ 1,656 $ — Interest rate derivatives designated as Fair Value Hedges 256 2,636 5,126 8,839 1,756 — Total derivatives designated as hedging instruments under ASC 815 $ 256 $ 8,906 $ 21,397 $ 34,734 $ 3,412 $ — Derivatives not designated as hedging instruments under ASC 815: Interest rate derivatives $ 134,130 $ 59,519 $ 69,865 $ 134,163 $ 59,159 $ 69,342 Interest rate lock commitments 3,373 3,405 4,128 148 2,694 — Forward commitments to sell mortgage loans 176 — 12 1,658 1,486 1,330 Foreign exchange contracts 351 1,342 751 306 1,337 709 Total derivatives not designated as hedging instruments under ASC 815 $ 138,030 $ 64,266 $ 74,756 $ 136,275 $ 64,676 $ 71,381 Total Derivatives $ 138,286 $ 73,172 $ 96,153 $ 171,009 $ 68,088 $ 71,381
Schedule Of Cash Flow Hedging Instruments	The table below provides details on these cash flow hedges, summarized by derivative type and maturity, as of September 30, 2019 : September 30, 2019 (In thousands) Notional Fair Value Maturity Date Amount Asset (Liability) Interest Rate Swaps: October 2021 $ 25,000 $ (386 ) November 2021 20,000 (334 ) December 2021 165,000 (2,841 ) May 2022 370,000 (6,628 ) June 2022 160,000 (2,796 ) July 2022 230,000 (4,027 ) August 2022 235,000 (4,196 ) Interest Rate Collars: September 2023 128,571 (4,687 ) Total Cash Flow Hedges $ 1,333,571 $ (25,895 )
Rollforward Of Amounts In Accumulated Other Comprehensive Income Related To Interest Rate Swaps Designated As Cash Flow Hedges	A rollforward of the amounts in accumulated other comprehensive income or loss related to interest rate derivatives designated as cash flow hedges follows: Three Months Ended Nine Months Ended (In thousands) September 30, September 30, September 30, September 30, Unrealized (loss) gain at beginning of period $ (16,422 ) $ 16,059 $ 10,742 $ 11,902 Amount reclassified from accumulated other comprehensive income to interest expense on deposits and other borrowings (2,428 ) (2,319 ) (10,071 ) (4,338 ) Amount of (loss) gain recognized in other comprehensive income (4,420 ) 2,531 (23,941 ) 8,707 Unrealized (loss) gain at end of period $ (23,270 ) $ 16,271 $ (23,270 ) $ 16,271
Schedule of Carrying Amount of Hedged Assets/(Liabilities)	The following table presents the carrying amount of the hedged assets/(liabilities) and the cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities) that are designated as a fair value hedge accounting relationship as of September 30, 2019 : September 30, 2019 (In thousands) Derivatives in Fair Value Hedging Relationships Location in the Statement of Condition Carrying Amount of the Hedged Assets/(Liabilities) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) Cumulative Amount of Fair Value Hedging Adjustment Remaining for any Hedged Assets (Liabilities) for which Hedge Accounting has been Discontinued Interest rate swaps Loans, net of unearned income $ 165,226 $ 8,458 $ — Available-for-sale debt securities 1,442 101 — The following table presents the loss or gain recognized related to derivative instruments that are designated as fair value hedges for the respective period: (In thousands) Derivatives in Fair Value Hedging Relationships Location of (Loss)/Gain Recognized in Income on Derivative Three Months Ended Nine Months Ended September 30, 2019 September 30, 2019 Interest rate swaps Interest and fees on loans $ (2 ) $ (42 ) Interest income - investment securities — —
Summary Amounts Included In Consolidated Statement Of Income Related To Derivatives	Amounts included in the Consolidated Statements of Income related to derivative instruments not designated in hedge relationships were as follows: (In thousands) Three Months Ended Nine Months Ended Derivative Location in income statement September 30, September 30, September 30, September 30, Interest rate swaps and caps Trading (losses) gains, net $ (75 ) $ (55 ) $ (392 ) $ 89 Mortgage banking derivatives Mortgage banking revenue 1,026 (1,122 ) 1,089 858 Foreign exchange contracts Trading (losses) gains, net 54 (18 ) 72 51 Covered call options Fees from covered call options — 627 2,427 2,893 Derivative contract held as economic hedge on MSRs Mortgage banking revenue 82 — 1,002 —
Offsetting Assets	The tables below summarize the Company's interest rate derivatives and offsetting positions as of the dates shown. Derivative Assets Derivative Liabilities Fair Value Fair Value (In thousands) September 30, December 31, September 30, September 30, December 31, September 30, Gross Amounts Recognized $ 134,386 $ 68,425 $ 91,262 $ 168,897 $ 62,571 $ 69,342 Less: Amounts offset in the Statements of Financial Condition — — — — — — Net amount presented in the Statements of Financial Condition $ 134,386 $ 68,425 $ 91,262 $ 168,897 $ 62,571 $ 69,342 Gross amounts not offset in the Statements of Financial Condition Offsetting Derivative Positions (1,572 ) (28,124 ) (7,887 ) (1,572 ) (28,124 ) (7,887 ) Collateral Posted — (23,810 ) (76,530 ) (167,325 ) (2,640 ) (340 ) Net Credit Exposure $ 132,814 $ 16,491 $ 6,845 $ — $ 31,807 $ 61,115
Offsetting Liabilities	The tables below summarize the Company's interest rate derivatives and offsetting positions as of the dates shown. Derivative Assets Derivative Liabilities Fair Value Fair Value (In thousands) September 30, December 31, September 30, September 30, December 31, September 30, Gross Amounts Recognized $ 134,386 $ 68,425 $ 91,262 $ 168,897 $ 62,571 $ 69,342 Less: Amounts offset in the Statements of Financial Condition — — — — — — Net amount presented in the Statements of Financial Condition $ 134,386 $ 68,425 $ 91,262 $ 168,897 $ 62,571 $ 69,342 Gross amounts not offset in the Statements of Financial Condition Offsetting Derivative Positions (1,572 ) (28,124 ) (7,887 ) (1,572 ) (28,124 ) (7,887 ) Collateral Posted — (23,810 ) (76,530 ) (167,325 ) (2,640 ) (340 ) Net Credit Exposure $ 132,814 $ 16,491 $ 6,845 $ — $ 31,807 $ 61,115

Fair Values of Assets and Lia_2

Fair Values of Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Summary Of Balances Of Assets And Liabilities Measured At Fair Value On A Recurring Basis	The following tables present the balances of assets and liabilities measured at fair value on a recurring basis for the periods presented: September 30, 2019 (Dollars in thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 221,670 $ 221,670 $ — $ — U.S. Government agencies 225,459 — 222,648 2,811 Municipal 146,104 — 33,046 113,058 Corporate notes 94,004 — 94,004 — Mortgage-backed 1,582,822 — 1,582,822 — Trading account securities 3,204 — 3,204 — Equity securities with readily determinable fair value 46,086 38,020 8,066 — Mortgage loans held-for-sale 464,727 — 464,727 — Loans held-for-investment 116,022 — 106,023 9,999 MSRs 75,585 — — 75,585 Nonqualified deferred compensation assets 13,750 — 13,750 — Derivative assets 138,286 — 135,307 2,979 Total $ 3,127,719 $ 259,690 $ 2,663,597 $ 204,432 Derivative liabilities $ 171,009 $ — $ 171,009 $ — December 31, 2018 (Dollars in thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 126,404 $ 126,404 $ — $ — U.S. Government agencies 140,307 — 137,157 3,150 Municipal 138,490 — 29,564 108,926 Corporate notes 91,045 — 91,045 — Mortgage-backed 1,629,835 — 1,629,835 — Trading account securities 1,692 — 1,692 — Equity securities with readily determinable fair value 34,717 — 34,717 — Mortgage loans held-for-sale 264,070 — 264,070 — Loans held-for-investment 93,857 — 82,510 11,347 MSRs 75,183 — — 75,183 Nonqualified deferred compensation assets 11,282 — 11,282 — Derivative assets 73,172 — 70,715 2,457 Total $ 2,680,054 $ 126,404 $ 2,352,587 $ 201,063 Derivative liabilities $ 68,088 $ — $ 68,088 $ — September 30, 2018 (Dollars in thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 124,761 $ — $ 124,761 $ — U.S. Government agencies 111,020 — 107,705 3,315 Municipal 133,373 — 35,787 97,586 Corporate notes 93,453 — 93,453 — Mortgage-backed 1,702,378 — 1,702,378 — Trading account securities 688 — 688 — Equity securities with readily determinable fair value 36,414 — 36,414 — Mortgage loans held-for-sale 338,111 — 338,111 — Loans held-for-investment 77,883 — 64,427 13,456 MSRs 74,530 — — 74,530 Nonqualified deferred compensation assets 12,503 — 12,503 — Derivative assets 96,153 — 93,661 2,492 Total $ 2,801,267 $ — $ 2,609,888 $ 191,379 Derivative liabilities $ 71,381 $ — $ 71,381 $ —
Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis	The changes in Level 3 assets measured at fair value on a recurring basis during the three and nine months ended September 30, 2019 and 2018 are summarized as follows: U.S. Government Agencies Loans held-for- investment Mortgage servicing rights Derivative Assets (Dollars in thousands) Municipal Balance at July 1, 2019 $ 110,296 $ 2,977 $ 10,481 $ 72,850 $ 3,596 Total net gains (losses) included in: Net income (1) — — 86 2,735 (617 ) Other comprehensive income (loss) (1,722 ) (9 ) — — — Purchases 5,668 — — — — Issuances — — — — — Sales — — — — — Settlements (1,184 ) (157 ) (1,203 ) — — Net transfers into/(out of) Level 3 — — 635 — — Balance at September 30, 2019 $ 113,058 $ 2,811 $ 9,999 $ 75,585 $ 2,979 (1) Changes in the balance of MSRs and derivative assets related to fair value adjustments are recorded as components of mortgage banking revenue. Changes in the balance of loans held-for-investment related to fair value adjustments are recorded as other non-interest income. U.S. Government Agencies Loans held-for- investment Mortgage servicing rights Derivative Assets (Dollars in thousands) Municipal Balance at January 1, 2019 $ 108,926 $ 3,150 $ 11,347 $ 75,183 $ 2,457 Total net gains (losses) included in: Net income (1) — — 371 (5 ) 522 Other comprehensive income (loss) 6,334 134 — — — Purchases (2) 7,192 — — 407 — Issuances — — — — — Sales — — — — — Settlements (9,394 ) (473 ) (2,554 ) — — Net transfers into/(out of) Level 3 — — 835 — — Balance at September 30, 2019 $ 113,058 $ 2,811 $ 9,999 $ 75,585 $ 2,979 U.S. Government Agencies Loans held-for- investment Mortgage servicing rights Derivative Assets (Dollars in thousands) Municipal Balance at July 1, 2018 $ 96,566 $ 3,482 $ 13,764 $ 63,194 $ 3,819 Total net gains (losses) included in: Net income (1) — — (32 ) 11,336 (1,327 ) Other comprehensive income (loss) (2,573 ) (9 ) — — — Purchases 4,830 — — — — Issuances — — — — — Sales — — — — — Settlements (1,237 ) (158 ) (1,520 ) — — Net transfers into/(out of) Level 3 — — 1,244 — — Balance at September 30, 2018 $ 97,586 $ 3,315 $ 13,456 $ 74,530 $ 2,492 U.S. Government Agencies Loans held-for- investment Mortgage servicing rights Derivative Assets (Dollars in thousands) Municipal Balance at January 1, 2018 $ 77,181 $ 3,779 $ 33,717 $ 33,676 $ 2,157 Total net gains (losses) included in: Net income (1) — — (1,420 ) 27,048 335 Other comprehensive income (loss) (5,658 ) (306 ) — — — Purchases (2) 31,846 — — 13,806 — Issuances — — — — — Sales — — — — — Settlements (5,783 ) (158 ) (24,177 ) — — Net transfers into/(out of) Level 3 — — 5,336 — — Balance at September 30, 2018 $ 97,586 $ 3,315 $ 13,456 $ 74,530 $ 2,492 (1) Changes in the balance of MSRs and derivative assets related to fair value adjustments are recorded as components of mortgage banking revenue. Changes in the balance of loans held-for-investment related to fair value adjustments are recorded as other non-interest income. (2) Mortgage servicing rights purchased as a part of the ROC and Veterans First business combinations in 2019 and 2018, respectively. See Note 3 - Business Combinations and Asset Acquisitions for further discussion.
Summary Of Assets Measured At Fair Value On A Nonrecurring Basis	For assets measured at fair value on a nonrecurring basis that were still held in the balance sheet at the end of the period, the following table provides the carrying value of the related individual assets or portfolios at September 30, 2019 . September 30, 2019 Three Months Ended September 30, 2019 Fair Value Losses Recognized, net Nine Months Ended September 30, 2019 Fair Value Losses Recognized, net (Dollars in thousands) Total Level 1 Level 2 Level 3 Impaired loans—collateral based $ 91,103 $ — $ — $ 91,103 $ 9,159 $ 32,139 Other real estate owned (1) 17,482 — — 17,482 862 2,468 Total $ 108,585 $ — $ — $ 108,585 $ 10,021 $ 34,607 (1) Fair value losses recognized, net on other real estate owned include valuation adjustments and charge-offs during the respective period.
Schedule Of Valuation Techniques And Significant Unobservable Inputs Used To Measure Both Recurring And Non-Recurring	The valuation techniques and significant unobservable inputs used to measure both recurring and non-recurring Level 3 fair value measurements at September 30, 2019 were as follows: (Dollars in thousands) Fair Value Valuation Methodology Significant Unobservable Input Range of Inputs Weighted Average of Inputs Impact to valuation from an increased or higher input value Measured at fair value on a recurring basis: Municipal Securities $ 113,058 Bond pricing Equivalent rating BBB-AA+ N/A Increase U.S. Government agencies 2,811 Bond pricing Equivalent rating AAA AAA Increase Loans held-for-investment 9,999 Discounted cash flows Discount rate 3%-4% 3.36% Decrease Credit discount 0%-7% 1.35% Decrease Constant prepayment rate (CPR) 15.03% 15.03% Decrease MSRs 75,585 Discounted cash flows Discount rate 9%-19% 9.96% Decrease Constant prepayment rate (CPR) 0%-93% 15.03% Decrease Cost of servicing $70-$200 $77 Decrease Cost of servicing - delinquent $200-$1,000 $399 Decrease Derivatives 2,979 Discounted cash flows Pull-through rate 0%-100% 75% Increase Measured at fair value on a non-recurring basis: Impaired loans—collateral based $ 91,103 Appraisal value Appraisal adjustment - cost of sale 10% 10.00% Decrease Other real estate owned 17,482 Appraisal value Appraisal adjustment - cost of sale 10% 10.00% Decrease
Summary Of Carrying Amounts And Estimated Fair Values Of Financial Instruments	The table below presents the carrying amounts and estimated fair values of the Company’s financial instruments as of the dates shown: At September 30, 2019 At December 31, 2018 At September 30, 2018 Carrying Fair Carrying Fair Carrying Fair (In thousands) Value Value Value Value Value Value Financial Assets: Cash and cash equivalents $ 448,814 $ 448,814 $ 392,200 $ 392,200 $ 279,993 $ 279,993 Interest bearing deposits with banks 2,260,806 2,260,806 1,099,594 1,099,594 1,137,044 1,137,044 Available-for-sale securities 2,270,059 2,270,059 2,126,081 2,126,081 2,164,985 2,164,985 Held-to-maturity securities 1,095,802 1,104,903 1,067,439 1,036,096 966,438 911,597 Trading account securities 3,204 3,204 1,692 1,692 688 688 Equity securities with readily determinable fair value 46,086 46,086 34,717 34,717 36,414 36,414 FHLB and FRB stock, at cost 92,714 92,714 91,354 91,354 99,998 99,998 Brokerage customer receivables 14,943 14,943 12,609 12,609 15,649 15,649 Mortgage loans held-for-sale, at fair value 464,727 464,727 264,070 264,070 338,111 338,111 Loans held-for-investment, at fair value 116,022 116,022 93,857 93,857 77,883 77,883 Loans held-for-investment, at amortized cost 25,594,149 25,472,310 23,726,834 23,780,739 23,046,068 23,261,545 Nonqualified deferred compensation assets 13,750 13,750 11,282 11,282 12,503 12,503 Derivative assets 138,286 138,286 73,172 73,172 96,153 96,153 Accrued interest receivable and other 272,072 272,072 260,281 260,281 254,879 254,879 Total financial assets $ 32,831,434 $ 32,718,696 $ 29,255,182 $ 29,277,744 $ 28,526,806 $ 28,687,442 Financial Liabilities Non-maturity deposits $ 23,091,143 $ 23,091,143 $ 20,833,837 $ 20,833,837 $ 19,456,677 $ 19,456,677 Deposits with stated maturities 5,619,236 5,635,597 5,260,841 5,283,063 5,460,038 5,475,048 FHLB advances 574,847 620,136 426,326 429,830 615,000 615,342 Other borrowings 410,488 410,488 393,855 393,855 373,571 373,571 Subordinated notes 435,979 451,947 139,210 138,345 139,172 146,838 Junior subordinated debentures 253,566 254,426 253,566 263,846 253,566 258,488 Derivative liabilities 171,009 171,009 68,088 68,088 71,381 71,381 Accrued interest payable 22,899 22,899 16,025 16,025 15,374 15,374 Total financial liabilities $ 30,579,167 $ 30,657,645 $ 27,391,748 $ 27,426,889 $ 26,384,779 $ 26,412,719

Stock-Based Compensation Plans

Stock-Based Compensation Plans (Tables)	9 Months Ended
	Sep. 30, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]
Summary Of Stock Option Activity	A summary of the Company's stock option activity for the nine months ended September 30, 2019 and September 30, 2018 is presented below: Stock Options Common Shares Weighted Average Strike Price Remaining Contractual Term (1) Intrinsic Value (2) ($000) Outstanding at January 1, 2019 795,014 $ 42.26 Granted — — Exercised (112,230 ) 38.64 Forfeited or canceled — — Outstanding at September 30, 2019 682,784 $ 42.85 2.4 $ 14,873 Exercisable at September 30, 2019 667,664 $ 42.81 2.4 $ 14,565 Stock Options Common Shares Weighted Average Strike Price Remaining Contractual Term (1) Intrinsic Value (2) ($000) Outstanding at January 1, 2018 1,084,756 $ 41.98 Granted — — Exercised (271,674 ) 41.36 Forfeited or canceled (6,942 ) 39.81 Outstanding at September 30, 2018 806,140 $ 42.20 3.3 $ 34,452 Exercisable at September 30, 2018 609,752 $ 42.42 3.0 $ 25,924 (1) Represents the remaining weighted average contractual life in years. (2) Aggregate intrinsic value represents the total pre-tax intrinsic value (i.e., the difference between the Company's stock price on the last trading day of the quarter and the option exercise price, multiplied by the number of shares) that would have been received by the option holders if they had exercised their options on the last day of the quarter. Options with exercise prices above the stock price on the last trading day of the quarter are excluded from the calculation of intrinsic value. The intrinsic value will change based on the fair market value of the Company's stock.
Summary Of Plans' Restricted Share And Performance-Vested Stock Award Activity	A summary of the Plans' restricted share activity for the nine months ended September 30, 2019 and September 30, 2018 is presented below: Nine months ended September 30, 2019 Nine months ended September 30, 2018 Restricted Shares Common Weighted Common Weighted Outstanding at January 1 143,263 $ 60.80 127,787 $ 53.33 Granted 13,099 71.66 28,506 87.65 Vested and issued (15,257 ) 76.69 (10,438 ) 56.88 Forfeited or canceled (1,691 ) 79.50 (982 ) 55.39 Outstanding at September 30 139,414 $ 59.85 144,873 $ 59.82 Vested, but not issuable at September 30 91,505 $ 52.13 90,294 $ 51.88 A summary of the Plans' performance-based stock award activity, based on the target level of the awards, for the nine months ended September 30, 2019 and September 30, 2018 is presented below: Nine months ended September 30, 2019 Nine months ended September 30, 2018 Performance-based Stock Common Weighted Common Weighted Outstanding at January 1 396,855 $ 67.71 359,196 $ 54.37 Granted 175,696 71.57 134,326 88.28 Vested and issued (94,288 ) 41.00 (82,307 ) 44.39 Forfeited (10,430 ) 74.70 (13,582 ) 59.18 Outstanding at September 30 467,833 $ 74.38 397,633 $ 67.72 Vested, but deferred at September 30 33,701 $ 42.92 21,477 $ 43.52

Shareholders' Equity and Earn_2

Shareholders' Equity and Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Components Of Other Comprehensive Income (Loss)	The following tables summarize the components of other comprehensive income (loss), including the related income tax effects, and the related amount reclassified to net income for the periods presented (in thousands). Accumulated Unrealized Losses on Securities Accumulated Unrealized Gains on Derivative Instruments Accumulated Foreign Currency Translation Adjustments Total Accumulated Other Comprehensive Loss Balance at July 1, 2019 $ 4,209 $ (12,044 ) $ (37,594 ) $ (45,429 ) Other comprehensive income (loss) during the period, net of tax, before reclassifications 13,371 (3,233 ) (1,471 ) 8,667 Amount reclassified from accumulated other comprehensive loss into net income, net of tax (292 ) (1,781 ) — (2,073 ) Amount reclassified from accumulated other comprehensive loss related to amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale, net of tax (42 ) — — (42 ) Net other comprehensive income (loss) during the period, net of tax $ 13,037 $ (5,014 ) $ (1,471 ) $ 6,552 Balance at September 30, 2019 $ 17,246 $ (17,058 ) $ (39,065 ) $ (38,877 ) Balance at January 1, 2019 $ (42,353 ) $ 7,857 $ (42,376 ) $ (76,872 ) Other comprehensive income (loss) during the period, net of tax, before reclassifications 60,527 (17,529 ) 3,311 46,309 Amount reclassified from accumulated other comprehensive loss into net income, net of tax (626 ) (7,386 ) — (8,012 ) Amount reclassified from accumulated other comprehensive loss related to amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale, net of tax (302 ) — — (302 ) Net other comprehensive income (loss) during the period, net of tax $ 59,599 $ (24,915 ) $ 3,311 $ 37,995 Balance at September 30, 2019 $ 17,246 $ (17,058 ) $ (39,065 ) $ (38,877 ) Accumulated Unrealized Losses on Securities Accumulated Unrealized Gains on Derivative Instruments Accumulated Foreign Currency Translation Adjustments Total Accumulated Other Comprehensive Loss Balance at July 1, 2018 $ (54,885 ) $ 11,748 $ (38,079 ) $ (81,216 ) Other comprehensive (loss) income during the period, net of tax, before reclassifications (13,277 ) 1,851 1,942 (9,484 ) Amount reclassified from accumulated other comprehensive loss into net income, net of tax (730 ) (1,696 ) — (2,426 ) Amount reclassified from accumulated other comprehensive loss related to amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale, net of tax (24 ) — — (24 ) Net other comprehensive (loss) income during the period, net of tax $ (14,031 ) $ 155 $ 1,942 $ (11,934 ) Balance at September 30, 2018 $ (68,916 ) $ 11,903 $ (36,137 ) $ (93,150 ) Balance at January 1, 2018 $ (15,813 ) $ 7,164 $ (33,186 ) $ (41,835 ) Cumulative effect adjustment from the adoption of: ASU 2016-01 (1,880 ) — — (1,880 ) ASU 2018-02 (4,517 ) 1,543 — (2,974 ) Other comprehensive (loss) income during the period, net of tax, before reclassifications (46,665 ) 6,368 (2,951 ) (43,248 ) Amount reclassified from accumulated other comprehensive loss into net income, net of tax (5 ) (3,172 ) — (3,177 ) Amount reclassified from accumulated other comprehensive loss related to amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale, net of tax (36 ) — — (36 ) Net other comprehensive (loss) income during the period, net of tax $ (46,706 ) $ 3,196 $ (2,951 ) $ (46,461 ) Balance at September 30, 2018 $ (68,916 ) $ 11,903 $ (36,137 ) $ (93,150 )
Other Comprehensive Income Reclassified from AOCI	Amount Reclassified from Accumulated Other Comprehensive Income for the Details Regarding the Component of Accumulated Other Comprehensive Income Three Months Ended Nine Months Ended Impacted Line on the Consolidated Statements of Income September 30, September 30, 2019 2018 2019 2018 Accumulated unrealized gains (losses) on securities Gains included in net income $ 400 $ 1,001 $ 856 $ 6 Gains (losses) on investment securities, net 400 1,001 856 6 Income before taxes Tax effect (108 ) (271 ) (230 ) (1 ) Income tax expense Net of tax $ 292 $ 730 $ 626 $ 5 Net income Accumulated unrealized losses on derivative instruments Amount reclassified to interest expense on deposits $ (2,635 ) $ (2,319 ) $ (10,403 ) $ (4,338 ) Interest on deposits Amount reclassified to interest expense on other borrowings 196 — 321 — Interest on other borrowings Amount reclassified to interest expense on junior subordinated debentures 11 — 11 — Interest on junior subordinated debentures 2,428 2,319 10,071 4,338 Income before taxes Tax effect (647 ) (623 ) (2,685 ) (1,166 ) Income tax expense Net of tax $ 1,781 $ 1,696 $ 7,386 $ 3,172 Net income
Computation Of Basic And Diluted Earnings Per Common Share	The following table shows the computation of basic and diluted earnings per share for the periods indicated: Three Months Ended Nine Months Ended (In thousands, except per share data) September 30, September 30, September 30, September 30, Net income $ 99,121 $ 91,948 $ 269,733 $ 263,509 Less: Preferred stock dividends 2,050 2,050 6,150 6,150 Net income applicable to common shares (A) $ 97,071 $ 89,898 $ 263,583 $ 257,359 Weighted average common shares outstanding (B) 56,690 56,366 56,627 56,268 Effect of dilutive potential common shares Common stock equivalents 773 918 724 912 Weighted average common shares and effect of dilutive potential common shares (C) 57,463 57,284 57,351 57,180 Net income per common share: Basic (A/B) $ 1.71 $ 1.59 $ 4.65 $ 4.57 Diluted (A/C) $ 1.69 $ 1.57 $ 4.60 $ 4.50

Recent Accounting Development_2

Recent Accounting Developments (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liability	$ 192,077
Right of use asset	$ 160,900
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liability		$ 199,400
Right of use asset		170,600
ASU 2017-08
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment from the adoption of new accounting pronouncement		(1,531)
Retained earnings | ASU 2017-08
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment from the adoption of new accounting pronouncement		$ (1,531)

Recent Accounting Development_3

Recent Accounting Developments (Lease Costs) (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2019USD ($)
Accounting Changes and Error Corrections [Abstract]
Operating lease cost	$ 5,299	$ 17,357
Finance lease cost:
Amortization of right-of-use asset	15	15
Interest on lease liability	26	26
Short-term lease cost	134	446
Variable lease cost	724	2,213
Sublease income	(164)	(345)
Total lease cost	6,034	19,712
Cash paid for amounts included in the measurement of operating lease liabilities	6,458	18,156
Cash paid for amounts included in the measurement of finance lease liabilities	24	24
Right-of-use asset obtained in exchange for new operating lease liabilities	587	3,635
Right-of-use asset obtained in exchange for new finance lease liabilities	$ 3,498	$ 3,498
Weighted average remaining lease term - operating leases	13 months 21 days	13 months 21 days
Weighted average remaining lease term - finance leases	39 months 24 days	39 months 24 days
Weighted average discount rate - operating leases	4.10%	4.10%
Weighted average discount rate - finance leases	4.43%	4.43%

Recent Accounting Development_4

Recent Accounting Developments (Future Required Fixed Payments) (Details) $ in Thousands	Sep. 30, 2019USD ($)
Accounting Changes and Error Corrections [Abstract]
Remaining in 2019	$ 5,585
2020	23,253
2021	21,424
2022	20,728
2023	18,618
2024	17,741
2025 and thereafter	149,964
Total minimum future amounts	257,313
Impact of measuring the lease liability on a discounted basis	(65,236)
Total lease liability	$ 192,077

Business Combinations and Ass_2

Business Combinations and Asset Acquisitions (Detail) Loan in Thousands, $ in Thousands	May 24, 2019USD ($)locations	Dec. 14, 2018USD ($)	Aug. 01, 2018USD ($)locations	Jan. 04, 2018USD ($)Loan	Sep. 30, 2019USD ($)	Dec. 07, 2018USD ($)
Business Acquisition [Line Items]
Goodwill recorded on acquisition					$ 10,726
Rush-Oak Corporation
Business Acquisition [Line Items]
Number of locations acquired | locations	1
Business combination, assets acquired	$ 223,800
Business combination, loans acquired	126,100
Business combination, deposits acquired	161,200
Goodwill recorded on acquisition	$ 10,700
Delaware Place Bank
Business Acquisition [Line Items]
Number of locations acquired | locations			1
Business combination, assets acquired			$ 282,800
Business combination, loans acquired			152,700
Business combination, deposits acquired			213,100
Goodwill recorded on acquisition			$ 26,600
Veterans First
Business Acquisition [Line Items]
Goodwill recorded on acquisition				$ 9,100
Number of loans acquired | Loan				10
Unpaid principal balance				$ 1,600,000
Elektra
Business Acquisition [Line Items]
Goodwill recorded on acquisition		$ 37,300
American Enterprise Bank
Business Acquisition [Line Items]
Asset acquisition, assets acquired						$ 164,000
Asset acquisition, loans acquired						119,300
Asset acquisition, deposits acquired						$ 150,800

Investment Securities (Marketab

Investment Securities (Marketable Securities) (Detail) - USD ($)	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Available-for-sale securities
Amortized Cost	$ 2,247,645,000	$ 2,185,494,000	$ 2,260,750,000
Gross Unrealized Gains	28,610,000	6,780,000	1,701,000
Gross Unrealized Losses	(6,196,000)	(66,193,000)	(97,466,000)
Fair Value	2,270,059,000	2,126,081,000	2,164,985,000
Held-to-maturity securities
Amortized Cost	1,095,802,000	1,067,439,000	966,438,000
Gross Unrealized Gains	11,521,000	2,241,000	629,000
Gross Unrealized Losses	(2,420,000)	(33,584,000)	(55,470,000)
Fair Value	1,104,903,000	1,036,096,000	911,597,000
Equity securities with readily determinable fair value
Amortized Cost	43,941,000	34,410,000	33,512,000
Gross Unrealized Gains	2,794,000	1,532,000	4,206,000
Gross Unrealized Losses	(649,000)	(1,225,000)	(1,304,000)
Fair Value	46,086,000	34,717,000	36,414,000
U.S. Treasury
Available-for-sale securities
Amortized Cost	220,756,000	126,199,000	125,153,000
Gross Unrealized Gains	914,000	391,000	0
Gross Unrealized Losses	0	(186,000)	(392,000)
Fair Value	221,670,000	126,404,000	124,761,000
U.S. Government agencies
Available-for-sale securities
Amortized Cost	221,891,000	139,420,000	111,997,000
Gross Unrealized Gains	3,569,000	917,000	8,000
Gross Unrealized Losses	(1,000)	(30,000)	(985,000)
Fair Value	225,459,000	140,307,000	111,020,000
Held-to-maturity securities
Amortized Cost	859,011,000	814,864,000	713,423,000
Gross Unrealized Gains	3,310,000	1,141,000	0
Gross Unrealized Losses	(2,187,000)	(28,576,000)	(47,706,000)
Fair Value	860,134,000	787,429,000	665,717,000
Municipal
Available-for-sale securities
Amortized Cost	141,311,000	136,831,000	133,006,000
Gross Unrealized Gains	4,896,000	2,427,000	1,481,000
Gross Unrealized Losses	(103,000)	(768,000)	(1,114,000)
Fair Value	146,104,000	138,490,000	133,373,000
Held-to-maturity securities
Amortized Cost	236,791,000	252,575,000	253,015,000
Gross Unrealized Gains	8,211,000	1,100,000	629,000
Gross Unrealized Losses	(233,000)	(5,008,000)	(7,764,000)
Fair Value	244,769,000	248,667,000	245,880,000
Corporate notes, financial issuers
Available-for-sale securities
Amortized Cost	97,058,000	97,079,000	97,085,000
Gross Unrealized Gains	126,000	35,000	87,000
Gross Unrealized Losses	(4,233,000)	(7,069,000)	(4,719,000)
Fair Value	92,951,000	90,045,000	92,453,000
Corporate notes, other
Available-for-sale securities
Amortized Cost	1,000,000	1,000,000	1,000,000
Gross Unrealized Gains	53,000	0	0
Gross Unrealized Losses	0	0	0
Fair Value	1,053,000	1,000,000	1,000,000
Mortgage-backed securities
Available-for-sale securities
Amortized Cost	1,529,749,000	1,641,146,000	1,744,600,000
Gross Unrealized Gains	18,682,000	2,510,000	121,000
Gross Unrealized Losses	(1,762,000)	(57,317,000)	(87,950,000)
Fair Value	1,546,669,000	1,586,339,000	1,656,771,000
Collateralized mortgage obligations
Available-for-sale securities
Amortized Cost	35,880,000	43,819,000	47,909,000
Gross Unrealized Gains	370,000	500,000	4,000
Gross Unrealized Losses	(97,000)	(823,000)	(2,306,000)
Fair Value	36,153,000	43,496,000	45,607,000
Mortgage-backed securities, subprime
Available-for-sale securities
Fair Value	$ 0	$ 0	$ 0

Investment Securities (Continuo

Investment Securities (Continuous Unrealized Loss Position, Fair Value) (Detail) $ in Thousands	Sep. 30, 2019USD ($)
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	$ 794,512
Continuous unrealized losses existing for less than 12 months, unrealized losses	(2,178)
Continuous unrealized losses existing for greater than 12 months, fair value	71,699
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(4,018)
Total, fair value	866,211
Total, unrealized losses	(6,196)
Held-to-maturity securities
Continuous unrealized losses existing for less than 12 months, fair value	239,637
Continuous unrealized losses existing for less than 12 months, unrealized losses	(2,225)
Continuous unrealized losses existing for greater than 12 months, fair value	5,591
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(195)
Total, fair value	245,228
Total, unrealized losses	(2,420)
U.S. Treasury
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	0
Continuous unrealized losses existing for less than 12 months, unrealized losses	0
Continuous unrealized losses existing for greater than 12 months, fair value	0
Continuous unrealized losses existing for greater than 12 months, unrealized losses	0
Total, fair value	0
Total, unrealized losses	0
U.S. Government agencies
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	1,950
Continuous unrealized losses existing for less than 12 months, unrealized losses	(1)
Continuous unrealized losses existing for greater than 12 months, fair value	0
Continuous unrealized losses existing for greater than 12 months, unrealized losses	0
Total, fair value	1,950
Total, unrealized losses	(1)
Held-to-maturity securities
Continuous unrealized losses existing for less than 12 months, fair value	232,535
Continuous unrealized losses existing for less than 12 months, unrealized losses	(2,186)
Continuous unrealized losses existing for greater than 12 months, fair value	2,000
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(1)
Total, fair value	234,535
Total, unrealized losses	(2,187)
Municipal
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	5,505
Continuous unrealized losses existing for less than 12 months, unrealized losses	(38)
Continuous unrealized losses existing for greater than 12 months, fair value	1,532
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(65)
Total, fair value	7,037
Total, unrealized losses	(103)
Held-to-maturity securities
Continuous unrealized losses existing for less than 12 months, fair value	7,102
Continuous unrealized losses existing for less than 12 months, unrealized losses	(39)
Continuous unrealized losses existing for greater than 12 months, fair value	3,591
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(194)
Total, fair value	10,693
Total, unrealized losses	(233)
Corporate notes, financial issuers
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	6,617
Continuous unrealized losses existing for less than 12 months, unrealized losses	(377)
Continuous unrealized losses existing for greater than 12 months, fair value	63,126
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(3,856)
Total, fair value	69,743
Total, unrealized losses	(4,233)
Corporate notes, other
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	0
Continuous unrealized losses existing for less than 12 months, unrealized losses	0
Continuous unrealized losses existing for greater than 12 months, fair value	0
Continuous unrealized losses existing for greater than 12 months, unrealized losses	0
Total, fair value	0
Total, unrealized losses	0
Mortgage-backed securities
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	778,842
Continuous unrealized losses existing for less than 12 months, unrealized losses	(1,743)
Continuous unrealized losses existing for greater than 12 months, fair value	1,243
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(19)
Total, fair value	780,085
Total, unrealized losses	(1,762)
Collateralized mortgage obligations
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	1,598
Continuous unrealized losses existing for less than 12 months, unrealized losses	(19)
Continuous unrealized losses existing for greater than 12 months, fair value	5,798
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(78)
Total, fair value	7,396
Total, unrealized losses	$ (97)

Investment Securities (Schedule

Investment Securities (Schedule of Realized Gain (Loss)) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Realized gains on investment securities	$ 801	$ 1,051	$ 1,348	$ 1,057
Realized losses on investment securities	(5)	(50)	(96)	(1,051)
Net realized gains on investment securities	796	1,001	1,252	6
Unrealized gains on equity securities with readily determinable fair value	165	530	2,299	2,632
Unrealized losses on equity securities with readily determinable fair value	(251)	(1,111)	(460)	(2,176)
Net unrealized (losses) gains on equity securities with readily determinable fair value	(86)	(581)	1,839	456
Upward adjustments of equity securities without readily determinable fair values	0	0	110	156
Downward adjustments of equity securities without readily determinable fair values	0	0		0
Impairment of equity securities without readily determinable fair values	0	(330)	(263)	(867)
Adjustment and impairment, net, of equity securities without readily determinable fair values	0	(330)	(153)	(711)
Other than temporary impairment charges	0	0	0	0
Gains (losses) on investment securities, net	710	90	2,938	(249)
Proceeds from sales of available-for-sale securities	238,008	649	905,926	209,640
Proceeds from sales of equity securities with readily determinable fair value	5,200	1,895	16,200	1,895
Proceeds from sales and capital distributions of equity securities without readily determinable fair value	$ 852	$ 64	$ 1,461	$ 680

Investment Securities (Investme

Investment Securities (Investments Classified by Contractual Maturity Date) (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Available-for-sale securities
Due in one year or less, amortized cost	$ 201,572	$ 82,206	$ 128,184
Due in one to five years, amortized cost	141,319	168,855	174,968
Due in five to ten years, amortized cost	200,118	121,129	118,229
Due after ten years, amortized cost	139,007	128,339	46,860
Without single maturity date, amortized cost	1,565,629	1,684,965	1,792,509
Amortized Cost	2,247,645	2,185,494	2,260,750
Due in one year or less, fair value	201,866	82,153	127,844
Due in one to five years, fair value	143,804	169,307	174,877
Due in five to ten years, fair value	198,250	115,206	113,875
Due after ten years, fair value	143,317	129,580	46,011
Without single maturity date, fair value	1,582,822	1,629,835	1,702,378
Fair Value	2,270,059	2,126,081	2,164,985
Held-to-maturity securities
Held-to-maturity securities, Due in one year or less, amortized cost	7,748	10,009	5,521
Held-to-maturity securities, Due in one to five years, amortized cost	28,138	29,436	31,782
Held-to-maturity securities, Due in five to ten years, amortized cost	231,021	295,897	255,146
Held-to-maturity securities, Due after ten years, amortized cost	828,895	732,097	673,989
Amortized Cost	1,095,802	1,067,439	966,438
Held-to-maturity securities, Due in one year or less, fair value	7,749	9,979	5,511
Held-to-maturity securities, Due in one to five years, fair value	28,335	28,995	31,160
Held-to-maturity securities, Due in five to ten years, fair value	235,138	290,206	243,608
Held-to-maturity securities, Due after ten years, fair value	833,681	706,916	631,318
Fair Value	$ 1,104,903	$ 1,036,096	$ 911,597

Investment Securities (Narrativ

Investment Securities (Narrative) (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)security	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)security	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Investments, Debt and Equity Securities [Abstract]
Equity securities without readily determinable fair value	$ 27,000		$ 27,000
Upward adjustments of equity securities without readily determinable fair values	0	$ 0	110	$ 156
Downward adjustments of equity securities without readily determinable fair values	0	0		0
Impairment of equity securities without readily determinable fair values	0	330	263	867
Pledged securities	$ 1,900,000	$ 1,700,000	$ 1,900,000	$ 1,700,000	$ 1,700,000
Number of securities by a single non-government sponsored issuer exceeding 10% of shareholders' equity | security	0		0

Loans (Summary of Loan Portfoli

Loans (Summary of Loan Portfolio) (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Loans [Line Items]
Total loans, net of unearned income	$ 25,710,171	$ 23,820,691	$ 23,123,951
Total loans, net of unearned income, percentage	100.00%	100.00%	100.00%
Commercial
Loans [Line Items]
Total loans, net of unearned income	$ 8,195,602	$ 7,828,538	$ 7,473,958
Total loans, net of unearned income, percentage	32.00%	33.00%	32.00%
Commercial real estate
Loans [Line Items]
Total loans, net of unearned income	$ 7,448,667	$ 6,933,252	$ 6,746,774
Total loans, net of unearned income, percentage	29.00%	29.00%	29.00%
Home equity
Loans [Line Items]
Total loans, net of unearned income	$ 512,303	$ 552,343	$ 578,844
Total loans, net of unearned income, percentage	2.00%	2.00%	3.00%
Residential real estate
Loans [Line Items]
Total loans, net of unearned income	$ 1,218,666	$ 1,002,464	$ 924,250
Total loans, net of unearned income, percentage	5.00%	4.00%	4.00%
Premium finance receivables | Commercial insurance loans
Loans [Line Items]
Total loans, net of unearned income	$ 3,449,950	$ 2,841,659	$ 2,885,327
Total loans, net of unearned income, percentage	13.00%	12.00%	12.00%
Premium finance receivables | Life insurance
Loans [Line Items]
Total loans, net of unearned income	$ 4,795,496	$ 4,541,794	$ 4,398,971
Total loans, net of unearned income, percentage	19.00%	19.00%	19.00%
Consumer and other
Loans [Line Items]
Total loans, net of unearned income	$ 89,487	$ 120,641	$ 115,827
Total loans, net of unearned income, percentage	0.00%	1.00%	1.00%

Loans (Schedule of Unpaid Princ

Loans (Schedule of Unpaid Principal Balance And Carrying Value Of Acquired Loans) (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Abstract]
Unpaid Principal Balance	$ 311,258	$ 341,555
Carrying Value	$ 286,009	$ 318,394

Loans Loans (Schedule of Loans

Loans Loans (Schedule of Loans Acquired with Deteriorated Credit Quality) (Details) $ in Thousands	Sep. 30, 2019USD ($)
Loans and Leases Receivable Disclosure [Abstract]
Contractually required payments including interest	$ 27,510
Less: Nonaccretable difference	2,162
Cash flows expected to be collected	25,348
Less: Accretable yield	1,874
Fair value of PCI loans acquired	$ 23,474

Loans (Activity Related to Accr

Loans (Activity Related to Accretable Yield of Loans Acquired With Evidence of Credit Quality Deterioration Since Origination) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretable yield, beginning balance	$ 34,289	$ 34,347	$ 34,876	$ 36,565
Acquisitions	0	2,321	1,874	2,321
Accretable yield amortized to interest income	(4,266)	(4,144)	(12,179)	(12,915)
Reclassification from non-accretable difference	184	1,734	2,190	4,596
Increases in interest cash flows due to payments and changes in interest rates	1,164	(1,093)	4,610	2,598
Accretable yield, ending balance	$ 31,371	$ 33,165	$ 31,371	$ 33,165

Loans (Narrative) (Detail)

Loans (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Schedule Of Accretable Yield Activity Related to Loans Acquired With Evidence Of Credit Quality Deterioration Since Origination Table [Line Items]
Net deferred loan fees and costs and fair value accounting adjustments	$ 8,900	$ 6,500	$ 8,900	$ 6,500	$ 4,500
Accretable yield amortized to interest income	4,266	4,144	12,179	12,915
Premium finance receivables
Schedule Of Accretable Yield Activity Related to Loans Acquired With Evidence Of Credit Quality Deterioration Since Origination Table [Line Items]
Unearned income portion of premium finance receivables	$ 117,500	$ 98,100	$ 117,500	$ 98,100	$ 112,900

Allowance for Loan Losses, Al_3

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Schedule of Aging of the Company's Loan Portfolio) (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Financing Receivable, Past Due [Line Items]
Nonaccrual	$ 103,619	$ 105,326	$ 114,844
90+ days and still accruing	19,347	18,872	23,260
Current	25,401,935	23,526,168	22,834,140
Total Loans	25,710,171	23,820,691	23,123,951
60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	51,113	34,176	42,344
30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	134,157	136,149	109,363
Commercial
Financing Receivable, Past Due [Line Items]
Nonaccrual	43,931	50,984	58,587
90+ days and still accruing	382	3,313	8,494
Current	8,086,942	7,737,729	7,375,123
Total Loans	8,195,602	7,828,538	7,473,958
Commercial | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	12,860	1,651	6,140
Commercial | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	51,487	34,861	25,614
Commercial | Commercial, industrial and other
Financing Receivable, Past Due [Line Items]
Nonaccrual	34,397	34,298	41,322
90+ days and still accruing	0	0	0
Current	5,096,879	5,062,729	4,745,178
Total Loans	5,150,567	5,120,096	4,805,486
Commercial | Commercial, industrial and other | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	2,296	1,451	2,535
Commercial | Commercial, industrial and other | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	16,995	21,618	16,451
Commercial | Franchise
Financing Receivable, Past Due [Line Items]
Nonaccrual	3,752	16,051	16,351
90+ days and still accruing	0	0	5,122
Current	903,695	924,190	915,817
Total Loans	914,774	948,979	937,290
Commercial | Franchise | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	0	0	0
Commercial | Franchise | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	7,327	8,738	0
Commercial | Mortgage warehouse lines of credit
Financing Receivable, Past Due [Line Items]
Nonaccrual	0	0	0
90+ days and still accruing	0	0	0
Current	311,501	144,199	168,860
Total Loans	314,697	144,199	171,860
Commercial | Mortgage warehouse lines of credit | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	0	0	3,000
Commercial | Mortgage warehouse lines of credit | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	3,196	0	0
Commercial | Asset-based lending
Financing Receivable, Past Due [Line Items]
Nonaccrual	5,782	635	910
90+ days and still accruing	0	0	0
Current	1,007,197	1,022,065	1,023,268
Total Loans	1,045,869	1,026,056	1,033,851
Commercial | Asset-based lending | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	9,521	200	590
Commercial | Asset-based lending | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	23,369	3,156	9,083
Commercial | Leases
Financing Receivable, Past Due [Line Items]
Nonaccrual	0	0	4
90+ days and still accruing	0	0	0
Current	753,770	564,430	509,591
Total Loans	754,163	565,680	509,675
Commercial | Leases | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	0	0	0
Commercial | Leases | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	393	1,250	80
Commercial | PCI - commercial
Financing Receivable, Past Due [Line Items]
Nonaccrual	0	0	0
90+ days and still accruing	382	3,313	3,372
Current	13,900	20,116	12,409
Total Loans	15,532	23,528	15,796
Commercial | PCI - commercial | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	1,043	0	15
Commercial | PCI - commercial | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	207	99	0
Commercial real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual	21,557	19,129	17,515
90+ days and still accruing	4,992	6,241	5,578
Current	7,379,391	6,845,490	6,652,557
Total Loans	7,448,667	6,933,252	6,746,774
Commercial real estate | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	9,629	10,826	27,040
Commercial real estate | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	33,098	51,566	44,084
Commercial real estate | Construction
Financing Receivable, Past Due [Line Items]
Nonaccrual	1,030	1,554	1,554
90+ days and still accruing	0	0	0
Current	847,442	749,846	778,725
Total Loans	850,575	760,824	798,330
Commercial real estate | Construction | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	0	0	1,823
Commercial real estate | Construction | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	2,103	9,424	16,228
Commercial real estate | Land
Financing Receivable, Past Due [Line Items]
Nonaccrual	994	107	228
90+ days and still accruing	0	0	0
Current	169,357	141,097	118,411
Total Loans	175,386	141,481	119,004
Commercial real estate | Land | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	88	170	365
Commercial real estate | Land | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	4,947	107	0
Commercial real estate | Office
Financing Receivable, Past Due [Line Items]
Nonaccrual	8,158	3,629	1,532
90+ days and still accruing	0	0	0
Current	986,470	929,739	932,166
Total Loans	996,931	939,322	940,777
Commercial real estate | Office | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	158	877	4,058
Commercial real estate | Office | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	2,145	5,077	3,021
Commercial real estate | Industrial
Financing Receivable, Past Due [Line Items]
Nonaccrual	100	285	178
90+ days and still accruing	0	0	0
Current	1,007,669	885,367	885,486
Total Loans	1,009,680	902,248	885,931
Commercial real estate | Industrial | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	950	0	122
Commercial real estate | Industrial | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	961	16,596	145
Commercial real estate | Retail
Financing Receivable, Past Due [Line Items]
Nonaccrual	7,174	10,753	10,586
90+ days and still accruing	0	0	0
Current	991,627	878,106	861,901
Total Loans	1,004,720	892,478	887,702
Commercial real estate | Retail | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	2,235	1,890	4,570
Commercial real estate | Retail | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	3,684	1,729	10,645
Commercial real estate | Multi-family
Financing Receivable, Past Due [Line Items]
Nonaccrual	690	311	318
90+ days and still accruing	0	0	0
Current	1,287,797	970,597	922,413
Total Loans	1,291,825	976,560	923,893
Commercial real estate | Multi-family | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	1,073	77	0
Commercial real estate | Multi-family | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	2,265	5,575	1,162
Commercial real estate | Mixed use and other
Financing Receivable, Past Due [Line Items]
Nonaccrual	3,411	2,490	3,119
90+ days and still accruing	0	0	0
Current	1,987,844	2,192,105	2,062,179
Total Loans	2,002,267	2,205,195	2,086,455
Commercial real estate | Mixed use and other | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	928	1,617	9,654
Commercial real estate | Mixed use and other | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	10,084	8,983	11,503
Commercial real estate | PCI - commercial real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual	0	0	0
90+ days and still accruing	4,992	6,241	5,578
Current	101,185	98,633	91,276
Total Loans	117,283	115,144	104,682
Commercial real estate | PCI - commercial real estate | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	4,197	6,195	6,448
Commercial real estate | PCI - commercial real estate | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	6,909	4,075	1,380
Home equity
Financing Receivable, Past Due [Line Items]
Nonaccrual	7,920	7,147	8,523
90+ days and still accruing	0	0	0
Current	501,188	541,960	565,768
Total Loans	512,303	552,343	578,844
Home equity | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	95	131	1,075
Home equity | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	3,100	3,105	3,478
Residential real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual	13,447	16,383	16,062
90+ days and still accruing	3,244	1,292	1,865
Current	1,198,674	976,926	904,006
Total Loans	1,218,666	1,002,464	924,250
Residential real estate | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	1,868	1,692	1,714
Residential real estate | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	1,433	6,171	603
Premium finance receivables | Commercial insurance loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	15,950	11,335	13,802
90+ days and still accruing	10,612	7,799	7,028
Current	3,397,563	2,796,058	2,845,313
Total Loans	3,449,950	2,841,659	2,885,327
Premium finance receivables | Commercial insurance loans | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	8,853	11,382	5,945
Premium finance receivables | Commercial insurance loans | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	16,972	15,085	13,239
Premium finance receivables | Life insurance loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	590	0	0
90+ days and still accruing	0	0	0
Current	4,608,450	4,340,856	4,203,465
Total Loans	4,654,588	4,373,891	4,225,481
Premium finance receivables | Life insurance loans | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	17,753	8,407	0
Premium finance receivables | Life insurance loans | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	27,795	24,628	22,016
Premium finance receivables | PCI - life insurance loans
Financing Receivable, Past Due [Line Items]
Nonaccrual	0	0	0
90+ days and still accruing	0	0	0
Current	140,908	167,903	173,490
Total Loans	140,908	167,903	173,490
Premium finance receivables | PCI - life insurance loans | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	0	0	0
Premium finance receivables | PCI - life insurance loans | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	0	0	0
Consumer and other
Financing Receivable, Past Due [Line Items]
Nonaccrual	224	348	355
90+ days and still accruing	117	227	295
Current	88,819	119,246	114,418
Total Loans	89,487	120,641	115,827
Consumer and other | 60-89 days past due
Financing Receivable, Past Due [Line Items]
Past Due	55	87	430
Consumer and other | 30-59 days past due
Financing Receivable, Past Due [Line Items]
Past Due	$ 272	$ 733	$ 329

Allowance for Loan Losses, Al_4

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Performance by Loan Class) (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	$ 25,710,171	$ 23,820,691	$ 23,123,951
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	8,195,602	7,828,538	7,473,958
Commercial | Commercial, industrial and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	5,150,567	5,120,096	4,805,486
Commercial | Franchise
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	914,774	948,979	937,290
Commercial | Mortgage warehouse lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	314,697	144,199	171,860
Commercial | Asset-based lending
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	1,045,869	1,026,056	1,033,851
Commercial | Leases
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	754,163	565,680	509,675
Commercial | PCI - commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	15,532	23,528	15,796
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	7,448,667	6,933,252	6,746,774
Commercial real estate | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	850,575	760,824	798,330
Commercial real estate | Land
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	175,386	141,481	119,004
Commercial real estate | Office
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	996,931	939,322	940,777
Commercial real estate | Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	1,009,680	902,248	885,931
Commercial real estate | Retail
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	1,004,720	892,478	887,702
Commercial real estate | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	1,291,825	976,560	923,893
Commercial real estate | Mixed use and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	2,002,267	2,205,195	2,086,455
Commercial real estate | PCI - commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	117,283	115,144	104,682
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	512,303	552,343	578,844
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	1,218,666	1,002,464	924,250
Premium finance receivables | Commercial insurance loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	3,449,950	2,841,659	2,885,327
Premium finance receivables | Life insurance loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	4,654,588	4,373,891	4,225,481
Premium finance receivables | PCI - life insurance loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	140,908	167,903	173,490
Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	89,487	120,641	115,827
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	25,595,887	23,707,457	22,996,724
Performing | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	8,151,671	7,777,554	7,410,249
Performing | Commercial | Commercial, industrial and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	5,116,170	5,085,798	4,764,164
Performing | Commercial | Franchise
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	911,022	932,928	915,817
Performing | Commercial | Mortgage warehouse lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	314,697	144,199	171,860
Performing | Commercial | Asset-based lending
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	1,040,087	1,025,421	1,032,941
Performing | Commercial | Leases
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	754,163	565,680	509,671
Performing | Commercial | PCI - commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	15,532	23,528	15,796
Performing | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	7,427,110	6,914,123	6,729,259
Performing | Commercial real estate | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	849,545	759,270	796,776
Performing | Commercial real estate | Land
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	174,392	141,374	118,776
Performing | Commercial real estate | Office
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	988,773	935,693	939,245
Performing | Commercial real estate | Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	1,009,580	901,963	885,753
Performing | Commercial real estate | Retail
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	997,546	881,725	877,116
Performing | Commercial real estate | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	1,291,135	976,249	923,575
Performing | Commercial real estate | Mixed use and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	1,998,856	2,202,705	2,083,336
Performing | Commercial real estate | PCI - commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	117,283	115,144	104,682
Performing | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	504,383	545,196	570,321
Performing | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	1,205,219	986,081	908,188
Performing | Premium finance receivables | Commercial insurance loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	3,423,388	2,822,525	2,864,497
Performing | Premium finance receivables | Life insurance loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	4,653,998	4,373,891	4,225,481
Performing | Premium finance receivables | PCI - life insurance loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	140,908	167,903	173,490
Performing | Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	89,210	120,184	115,239
Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	114,284	113,234	127,227
Non-performing | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	43,931	50,984	63,709
Non-performing | Commercial | Commercial, industrial and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	34,397	34,298	41,322
Non-performing | Commercial | Franchise
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	3,752	16,051	21,473
Non-performing | Commercial | Mortgage warehouse lines of credit
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	0	0	0
Non-performing | Commercial | Asset-based lending
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	5,782	635	910
Non-performing | Commercial | Leases
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	0	0	4
Non-performing | Commercial | PCI - commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	0	0	0
Non-performing | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	21,557	19,129	17,515
Non-performing | Commercial real estate | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	1,030	1,554	1,554
Non-performing | Commercial real estate | Land
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	994	107	228
Non-performing | Commercial real estate | Office
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	8,158	3,629	1,532
Non-performing | Commercial real estate | Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	100	285	178
Non-performing | Commercial real estate | Retail
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	7,174	10,753	10,586
Non-performing | Commercial real estate | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	690	311	318
Non-performing | Commercial real estate | Mixed use and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	3,411	2,490	3,119
Non-performing | Commercial real estate | PCI - commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	0	0	0
Non-performing | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	7,920	7,147	8,523
Non-performing | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	13,447	16,383	16,062
Non-performing | Premium finance receivables | Commercial insurance loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	26,562	19,134	20,830
Non-performing | Premium finance receivables | Life insurance loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	590	0	0
Non-performing | Premium finance receivables | PCI - life insurance loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	0	0	0
Non-performing | Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net of unearned income	$ 277	$ 457	$ 588

Allowance for Loan Losses, Al_5

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Activity in the Allowance for Credit Losses) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses at beginning of period	$ 160,421	$ 143,402	$ 152,770	$ 137,905
Other adjustments	(13)	(18)	(51)	(102)
Reclassification from allowance for unfunded lending-related commitments	(30)	(2)	(116)	24
Charge-offs	(11,186)	(6,981)	(41,654)	(23,129)
Recoveries	1,737	2,313	4,776	10,627
Provision for credit losses	10,834	11,042	46,038	24,431
Allowance for loan losses at period end	161,763	149,756	161,763	149,756
Allowance for unfunded lending-related commitments at period end	1,510	1,245	1,510	1,245
Allowance for credit losses at period end	163,273	151,001	163,273	151,001
Individually evaluated for impairment	14,940	14,375	14,940	14,375
Collectively evaluated for impairment	147,860	135,942	147,860	135,942
Loans at period end, Individually evaluated for impairment	131,050	132,799	131,050	132,799
Loans at period end, Collectively evaluated for impairment	25,177,090	22,608,543	25,177,090	22,608,543
Loans at period end, Loans acquired with deteriorated credit quality	286,009	304,726	286,009	304,726
Loans held at fair value	116,022	77,883	116,022	77,883
Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at period end	473	684	473	684
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses at beginning of period	74,893	60,727	67,826	57,811
Other adjustments	0	(1)	0	(3)
Reclassification from allowance for unfunded lending-related commitments	0	0	0	0
Charge-offs	(6,775)	(3,219)	(24,658)	(8,116)
Recoveries	367	304	974	1,232
Provision for credit losses	4,642	8,934	28,985	15,821
Allowance for loan losses at period end	73,127	66,745	73,127	66,745
Allowance for unfunded lending-related commitments at period end	0	0	0	0
Allowance for credit losses at period end	73,127	66,745	73,127	66,745
Individually evaluated for impairment	10,606	10,164	10,606	10,164
Collectively evaluated for impairment	62,160	55,987	62,160	55,987
Loans at period end, Individually evaluated for impairment	58,030	67,381	58,030	67,381
Loans at period end, Collectively evaluated for impairment	8,122,040	7,390,781	8,122,040	7,390,781
Loans at period end, Loans acquired with deteriorated credit quality	15,532	15,796	15,532	15,796
Loans held at fair value	0	0	0	0
Commercial | Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at period end	361	594	361	594
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses at beginning of period	63,270	57,660	60,267	55,227
Other adjustments	0	(15)	(35)	(66)
Reclassification from allowance for unfunded lending-related commitments	(30)	(2)	(116)	24
Charge-offs	(809)	(208)	(4,869)	(1,176)
Recoveries	385	193	1,112	4,267
Provision for credit losses	2,122	619	8,579	(29)
Allowance for loan losses at period end	64,938	58,247	64,938	58,247
Allowance for unfunded lending-related commitments at period end	1,510	1,245	1,510	1,245
Allowance for credit losses at period end	66,448	59,492	66,448	59,492
Individually evaluated for impairment	3,600	3,158	3,600	3,158
Collectively evaluated for impairment	62,795	56,316	62,795	56,316
Loans at period end, Individually evaluated for impairment	32,155	31,952	32,155	31,952
Loans at period end, Collectively evaluated for impairment	7,299,229	6,610,140	7,299,229	6,610,140
Loans at period end, Loans acquired with deteriorated credit quality	117,283	104,682	117,283	104,682
Loans held at fair value	0	0	0	0
Commercial real estate | Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at period end	53	18	53	18
Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses at beginning of period	3,631	9,551	8,507	10,493
Other adjustments	0	(2)	(20)	(2)
Reclassification from allowance for unfunded lending-related commitments	0	0	0	0
Charge-offs	(1,594)	(561)	(2,372)	(1,530)
Recoveries	183	142	313	436
Provision for credit losses	1,500	13	(2,708)	(254)
Allowance for loan losses at period end	3,720	9,143	3,720	9,143
Allowance for unfunded lending-related commitments at period end	0	0	0	0
Allowance for credit losses at period end	3,720	9,143	3,720	9,143
Individually evaluated for impairment	313	611	313	611
Collectively evaluated for impairment	3,407	8,532	3,407	8,532
Loans at period end, Individually evaluated for impairment	18,702	11,284	18,702	11,284
Loans at period end, Collectively evaluated for impairment	493,601	567,560	493,601	567,560
Loans at period end, Loans acquired with deteriorated credit quality	0	0	0	0
Loans held at fair value	0	0	0	0
Home equity | Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at period end	0	0	0	0
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses at beginning of period	8,146	6,336	7,194	6,688
Other adjustments	0	(14)	(15)	(19)
Reclassification from allowance for unfunded lending-related commitments	0	0	0	0
Charge-offs	(25)	(337)	(315)	(1,088)
Recoveries	203	466	372	2,028
Provision for credit losses	1,087	(160)	2,175	(1,318)
Allowance for loan losses at period end	9,411	6,291	9,411	6,291
Allowance for unfunded lending-related commitments at period end	0	0	0	0
Allowance for credit losses at period end	9,411	6,291	9,411	6,291
Individually evaluated for impairment	315	325	315	325
Collectively evaluated for impairment	9,037	5,894	9,037	5,894
Loans at period end, Individually evaluated for impairment	21,889	21,781	21,889	21,781
Loans at period end, Collectively evaluated for impairment	1,070,795	815,442	1,070,795	815,442
Loans at period end, Loans acquired with deteriorated credit quality	9,960	9,144	9,960	9,144
Loans held at fair value	116,022	77,883	116,022	77,883
Residential real estate | Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at period end	59	72	59	72
Premium finance receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses at beginning of period	8,940	7,734	7,715	6,846
Other adjustments	(13)	14	19	(12)
Reclassification from allowance for unfunded lending-related commitments	0	0	0	0
Charge-offs	(1,866)	(2,512)	(9,085)	(10,487)
Recoveries	563	1,142	1,853	2,502
Provision for credit losses	1,742	1,796	8,864	9,325
Allowance for loan losses at period end	9,366	8,174	9,366	8,174
Allowance for unfunded lending-related commitments at period end	0	0	0	0
Allowance for credit losses at period end	9,366	8,174	9,366	8,174
Individually evaluated for impairment	0	0	0	0
Collectively evaluated for impairment	9,366	8,174	9,366	8,174
Loans at period end, Individually evaluated for impairment	0	0	0	0
Loans at period end, Collectively evaluated for impairment	8,104,538	7,110,808	8,104,538	7,110,808
Loans at period end, Loans acquired with deteriorated credit quality	140,908	173,490	140,908	173,490
Loans held at fair value	0	0	0	0
Premium finance receivables | Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at period end	0	0	0	0
Consumer and other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses at beginning of period	1,541	1,394	1,261	840
Other adjustments	0	0	0	0
Reclassification from allowance for unfunded lending-related commitments	0	0	0	0
Charge-offs	(117)	(144)	(355)	(732)
Recoveries	36	66	152	162
Provision for credit losses	(259)	(160)	143	886
Allowance for loan losses at period end	1,201	1,156	1,201	1,156
Allowance for unfunded lending-related commitments at period end	0	0	0	0
Allowance for credit losses at period end	1,201	1,156	1,201	1,156
Individually evaluated for impairment	106	117	106	117
Collectively evaluated for impairment	1,095	1,039	1,095	1,039
Loans at period end, Individually evaluated for impairment	274	401	274	401
Loans at period end, Collectively evaluated for impairment	86,887	113,812	86,887	113,812
Loans at period end, Loans acquired with deteriorated credit quality	2,326	1,614	2,326	1,614
Loans held at fair value	0	0	0	0
Consumer and other | Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses at period end	$ 0	$ 0	$ 0	$ 0

Allowance for Loan Losses, Al_6

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Impaired Loans, Including Restructured Loans) (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Receivables [Abstract]
Impaired loans with an allowance for loan loss required	$ 52,485	$ 60,219	$ 83,349
Impaired loans with no allowance for loan loss required	78,338	67,050	49,173
Total impaired loans	130,823	127,269	132,522
Allowance for loan losses related to impaired loans	14,934	11,437	14,365
TDRs	$ 66,308	$ 66,102	$ 66,219

Allowance for Loan Losses, Al_7

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Impaired Loans by Loan Class) (Detail) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Impaired loans with a related allowance recorded, recorded investment	$ 52,485	$ 83,349	$ 60,219
Impaired loans with a related allowance recorded, related allowance	14,934	14,365	11,437
Impaired loans with no related allowance recorded, recorded investment	78,338	49,173	67,050
Total impaired loans	130,823	132,522	127,269
Total impaired loans, unpaid principal balance	152,444	145,561	139,246
Total impaired loans, average recorded investment	144,893	134,975	133,481
Total impaired loans, interest income recognized	6,746	5,768	7,347
Commercial | Commercial, industrial and other
Financing Receivable, Impaired [Line Items]
Impaired loans with a related allowance recorded, recorded investment	20,281	36,564	16,703
Impaired loans with a related allowance recorded, unpaid principal balance	20,536	36,699	17,029
Impaired loans with a related allowance recorded, related allowance	10,606	8,242	4,866
Impaired loans with a related allowance recorded, average recorded investment	20,411	30,259	17,868
Impaired loans with a related allowance recorded, interest income recognized	1,011	1,404	1,181
Impaired loans with no related allowance recorded, recorded investment	25,804	5,758	18,314
Impaired loans with no related allowance recorded, unpaid principal balance	30,152	7,022	21,501
Impaired loans with no related allowance recorded, average recorded investment	29,361	9,325	20,547
Impaired loans with no related allowance recorded, interest income recognized	1,769	465	1,143
Commercial | Franchise
Financing Receivable, Impaired [Line Items]
Impaired loans with a related allowance recorded, recorded investment	0	16,316	16,021
Impaired loans with a related allowance recorded, unpaid principal balance	0	18,504	16,256
Impaired loans with a related allowance recorded, related allowance	0	1,638	1,375
Impaired loans with a related allowance recorded, average recorded investment	0	18,387	16,221
Impaired loans with a related allowance recorded, interest income recognized	0	771	909
Impaired loans with no related allowance recorded, recorded investment	3,752	5,157	5,152
Impaired loans with no related allowance recorded, unpaid principal balance	10,083	5,158	5,154
Impaired loans with no related allowance recorded, average recorded investment	11,857	5,376	5,320
Impaired loans with no related allowance recorded, interest income recognized	715	302	403
Commercial | Mortgage warehouse line of credit
Financing Receivable, Impaired [Line Items]
Impaired loans with a related allowance recorded, recorded investment	0		0
Impaired loans with a related allowance recorded, unpaid principal balance	0		0
Impaired loans with a related allowance recorded, related allowance	0		0
Impaired loans with a related allowance recorded, average recorded investment	0		0
Impaired loans with a related allowance recorded, interest income recognized	0		0
Commercial | Asset-based lending
Financing Receivable, Impaired [Line Items]
Impaired loans with a related allowance recorded, recorded investment	130	646	557
Impaired loans with a related allowance recorded, unpaid principal balance	130	646	557
Impaired loans with a related allowance recorded, related allowance	0	283	317
Impaired loans with a related allowance recorded, average recorded investment	130	724	689
Impaired loans with a related allowance recorded, interest income recognized	6	39	50
Impaired loans with no related allowance recorded, recorded investment	5,782	264	207
Impaired loans with no related allowance recorded, unpaid principal balance	6,164	1,088	601
Impaired loans with no related allowance recorded, average recorded investment	5,457	1,623	569
Impaired loans with no related allowance recorded, interest income recognized	215	89	51
Commercial | Leases
Financing Receivable, Impaired [Line Items]
Impaired loans with a related allowance recorded, recorded investment	1,585	1,777	1,730
Impaired loans with a related allowance recorded, unpaid principal balance	1,585	1,777	1,730
Impaired loans with a related allowance recorded, related allowance	0	1	0
Impaired loans with a related allowance recorded, average recorded investment	1,651	1,836	1,812
Impaired loans with a related allowance recorded, interest income recognized	62	69	91
Impaired loans with no related allowance recorded, recorded investment	696	899	845
Impaired loans with no related allowance recorded, unpaid principal balance	733	930	879
Impaired loans with no related allowance recorded, average recorded investment	761	974	936
Impaired loans with no related allowance recorded, interest income recognized	36	43	56
Commercial real estate | Construction
Financing Receivable, Impaired [Line Items]
Impaired loans with a related allowance recorded, recorded investment	0	1,554	1,554
Impaired loans with a related allowance recorded, unpaid principal balance	0	1,554	1,554
Impaired loans with a related allowance recorded, related allowance	0	390	550
Impaired loans with a related allowance recorded, average recorded investment	0	1,554	1,554
Impaired loans with a related allowance recorded, interest income recognized	0	56	76
Impaired loans with no related allowance recorded, recorded investment	1,030	1,117	1,117
Impaired loans with no related allowance recorded, unpaid principal balance	1,554	1,117	1,117
Impaired loans with no related allowance recorded, average recorded investment	1,146	1,252	1,218
Impaired loans with no related allowance recorded, interest income recognized	65	40	52
Commercial real estate | Land
Financing Receivable, Impaired [Line Items]
Impaired loans with a related allowance recorded, recorded investment	0	1,375	0
Impaired loans with a related allowance recorded, unpaid principal balance	0	1,375	0
Impaired loans with a related allowance recorded, related allowance	0	1	0
Impaired loans with a related allowance recorded, average recorded investment	0	1,508	0
Impaired loans with a related allowance recorded, interest income recognized	0	53	0
Impaired loans with no related allowance recorded, recorded investment	994	2,325	3,396
Impaired loans with no related allowance recorded, unpaid principal balance	1,303	2,431	3,491
Impaired loans with no related allowance recorded, average recorded investment	1,184	2,366	3,751
Impaired loans with no related allowance recorded, interest income recognized	54	98	198
Commercial real estate | Office
Financing Receivable, Impaired [Line Items]
Impaired loans with a related allowance recorded, recorded investment	8,043	579	573
Impaired loans with a related allowance recorded, unpaid principal balance	8,190	647	638
Impaired loans with a related allowance recorded, related allowance	3,470	26	21
Impaired loans with a related allowance recorded, average recorded investment	8,114	591	587
Impaired loans with a related allowance recorded, interest income recognized	283	19	25
Impaired loans with no related allowance recorded, recorded investment	662	1,532	3,629
Impaired loans with no related allowance recorded, unpaid principal balance	679	2,077	3,642
Impaired loans with no related allowance recorded, average recorded investment	667	1,541	3,651
Impaired loans with no related allowance recorded, interest income recognized	31	86	184
Commercial real estate | Industrial
Financing Receivable, Impaired [Line Items]
Impaired loans with a related allowance recorded, recorded investment	0	45	0
Impaired loans with a related allowance recorded, unpaid principal balance	0	154	0
Impaired loans with a related allowance recorded, related allowance	0	1	0
Impaired loans with a related allowance recorded, average recorded investment	0	56	0
Impaired loans with a related allowance recorded, interest income recognized	0	6	0
Impaired loans with no related allowance recorded, recorded investment	105	178	322
Impaired loans with no related allowance recorded, unpaid principal balance	218	195	450
Impaired loans with no related allowance recorded, average recorded investment	122	188	363
Impaired loans with no related allowance recorded, interest income recognized	9	9	30
Commercial real estate | Retail
Financing Receivable, Impaired [Line Items]
Impaired loans with a related allowance recorded, recorded investment	5,029	15,325	14,633
Impaired loans with a related allowance recorded, unpaid principal balance	5,029	15,567	14,633
Impaired loans with a related allowance recorded, related allowance	32	2,413	3,413
Impaired loans with a related allowance recorded, average recorded investment	5,076	15,376	14,694
Impaired loans with a related allowance recorded, interest income recognized	171	535	676
Impaired loans with no related allowance recorded, recorded investment	7,507	777	1,592
Impaired loans with no related allowance recorded, unpaid principal balance	10,993	946	1,945
Impaired loans with no related allowance recorded, average recorded investment	8,307	874	1,699
Impaired loans with no related allowance recorded, interest income recognized	437	42	110
Commercial real estate | Multi-family
Financing Receivable, Impaired [Line Items]
Impaired loans with a related allowance recorded, recorded investment	1,168	1,197	0
Impaired loans with a related allowance recorded, unpaid principal balance	1,168	1,197	0
Impaired loans with a related allowance recorded, related allowance	25	8	0
Impaired loans with a related allowance recorded, average recorded investment	1,178	1,209	0
Impaired loans with a related allowance recorded, interest income recognized	39	32	0
Impaired loans with no related allowance recorded, recorded investment	690	318	1,498
Impaired loans with no related allowance recorded, unpaid principal balance	797	412	1,595
Impaired loans with no related allowance recorded, average recorded investment	704	329	1,529
Impaired loans with no related allowance recorded, interest income recognized	23	9	55
Commercial real estate | Mixed use and other
Financing Receivable, Impaired [Line Items]
Impaired loans with a related allowance recorded, recorded investment	774	1,590	1,188
Impaired loans with a related allowance recorded, unpaid principal balance	821	1,801	1,221
Impaired loans with a related allowance recorded, related allowance	67	309	293
Impaired loans with a related allowance recorded, average recorded investment	813	1,754	1,354
Impaired loans with a related allowance recorded, interest income recognized	30	76	66
Impaired loans with no related allowance recorded, recorded investment	5,926	3,763	3,522
Impaired loans with no related allowance recorded, unpaid principal balance	6,189	4,362	3,836
Impaired loans with no related allowance recorded, average recorded investment	6,091	3,950	3,611
Impaired loans with no related allowance recorded, interest income recognized	275	194	227
Home equity
Financing Receivable, Impaired [Line Items]
Impaired loans with a related allowance recorded, recorded investment	8,374	2,287	3,133
Impaired loans with a related allowance recorded, unpaid principal balance	8,969	2,651	3,470
Impaired loans with a related allowance recorded, related allowance	313	611	282
Impaired loans with a related allowance recorded, average recorded investment	8,534	2,303	3,165
Impaired loans with a related allowance recorded, interest income recognized	251	78	131
Impaired loans with no related allowance recorded, recorded investment	10,328	8,997	9,122
Impaired loans with no related allowance recorded, unpaid principal balance	12,132	12,131	12,383
Impaired loans with no related allowance recorded, average recorded investment	10,709	9,015	9,323
Impaired loans with no related allowance recorded, interest income recognized	465	462	564
Residential real estate
Financing Receivable, Impaired [Line Items]
Impaired loans with a related allowance recorded, recorded investment	6,995	3,977	4,011
Impaired loans with a related allowance recorded, unpaid principal balance	7,261	4,291	4,263
Impaired loans with a related allowance recorded, related allowance	315	325	204
Impaired loans with a related allowance recorded, average recorded investment	7,061	3,998	4,056
Impaired loans with a related allowance recorded, interest income recognized	188	128	159
Impaired loans with no related allowance recorded, recorded investment	14,894	17,804	18,053
Impaired loans with no related allowance recorded, unpaid principal balance	17,309	20,291	20,765
Impaired loans with no related allowance recorded, average recorded investment	15,259	18,193	18,552
Impaired loans with no related allowance recorded, interest income recognized	595	643	883
Consumer and other
Financing Receivable, Impaired [Line Items]
Impaired loans with a related allowance recorded, recorded investment	106	117	116
Impaired loans with a related allowance recorded, unpaid principal balance	124	130	129
Impaired loans with a related allowance recorded, related allowance	106	117	116
Impaired loans with a related allowance recorded, average recorded investment	110	119	119
Impaired loans with a related allowance recorded, interest income recognized	5	5	7
Impaired loans with no related allowance recorded, recorded investment	168	284	281
Impaired loans with no related allowance recorded, unpaid principal balance	325	408	407
Impaired loans with no related allowance recorded, average recorded investment	190	295	293
Impaired loans with no related allowance recorded, interest income recognized	$ 11	$ 15	$ 20

Allowance for Loan Losses, Al_8

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of the Post-Modification Balance of TDRs) (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019USD ($)contracts	Sep. 30, 2018USD ($)contracts	Sep. 30, 2019USD ($)contracts	Sep. 30, 2018USD ($)contracts	Sep. 30, 2019USD ($)contracts	Sep. 30, 2018USD ($)contracts
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	68	22	127	41	157	49
TDRs, balance | $	$ 13,597,000	$ 4,233,000	$ 46,804,000	$ 24,828,000	$ 51,219,000	$ 43,767,000
Extension at Below Market Terms
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	63	22	115	38
TDRs, balance | $	$ 12,481,000	$ 4,233,000	$ 26,964,000	$ 6,956,000
Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	9	7	25	13
TDRs, balance | $	$ 1,048,000	$ 621,000	$ 5,087,000	$ 1,502,000
Modification to Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	6	0	16	3
TDRs, balance | $	$ 6,309,000	$ 0	$ 26,527,000	$ 17,872,000
Forgiveness of Debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	0	0	0	0
TDRs, balance | $	$ 0	$ 0	$ 0	$ 0
Residential real estate and other
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	60	20	102	31	130	35
TDRs, balance | $	$ 4,879,000	$ 3,679,000	$ 15,126,000	$ 5,846,000	$ 19,041,000	$ 6,257,000
Residential real estate and other | Extension at Below Market Terms
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	59	20	101	31
TDRs, balance | $	$ 4,568,000	$ 3,679,000	$ 14,815,000	$ 5,846,000
Residential real estate and other | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	9	7	24	12
TDRs, balance | $	$ 1,048,000	$ 621,000	$ 4,537,000	$ 1,417,000
Residential real estate and other | Modification to Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	1	0	1	0
TDRs, balance | $	$ 311,000	$ 0	$ 311,000	$ 0
Residential real estate and other | Forgiveness of Debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	0	0	0	0
TDRs, balance | $	$ 0	$ 0	$ 0	$ 0
Commercial, industrial and other | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	5	1	18	4	18	5
TDRs, balance | $	$ 3,526,000	$ 519,000	$ 24,835,000	$ 13,442,000	$ 24,835,000	$ 15,714,000
Commercial, industrial and other | Commercial | Extension at Below Market Terms
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	2	1	8	3
TDRs, balance | $	$ 2,721,000	$ 519,000	$ 5,608,000	$ 692,000
Commercial, industrial and other | Commercial | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	0	0	1	0
TDRs, balance | $	$ 0	$ 0	$ 550,000	$ 0
Commercial, industrial and other | Commercial | Modification to Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	3	0	12	1
TDRs, balance | $	$ 807,000	$ 0	$ 20,723,000	$ 12,750,000
Commercial, industrial and other | Commercial | Forgiveness of Debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	0	0	0	0
TDRs, balance | $	$ 0	$ 0	$ 0	$ 0
Franchise | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts		1		3		6
TDRs, balance | $		$ 35,000		$ 5,157,000		$ 21,413,000
Franchise | Commercial | Extension at Below Market Terms
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts		1		1
TDRs, balance | $		$ 35,000		$ 35,000
Franchise | Commercial | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts		0		0
TDRs, balance | $		$ 0		$ 0
Franchise | Commercial | Modification to Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts		0		2
TDRs, balance | $		$ 0		$ 5,122,000
Franchise | Commercial | Forgiveness of Debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts		0		0
TDRs, balance | $		$ 0		$ 0
Asset-based lending | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts			1		2
TDRs, balance | $			$ 76,000		$ 206,000
Asset-based lending | Commercial | Extension at Below Market Terms
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts			1
TDRs, balance | $			$ 76,000
Asset-based lending | Commercial | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts			0
TDRs, balance | $			$ 0
Asset-based lending | Commercial | Modification to Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts			0
TDRs, balance | $			$ 0
Asset-based lending | Commercial | Forgiveness of Debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts			0
TDRs, balance | $			$ 0
Leases | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts		0		1		1
TDRs, balance | $		$ 0		$ 239,000		$ 239,000
Leases | Commercial | Extension at Below Market Terms
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts		0		1
TDRs, balance | $		$ 0		$ 239,000
Leases | Commercial | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts		0		0
TDRs, balance | $		$ 0		$ 0
Leases | Commercial | Modification to Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts		0		0
TDRs, balance | $		$ 0		$ 0
Leases | Commercial | Forgiveness of Debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts		0		0
TDRs, balance | $		$ 0		$ 0
Office | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	1		2	1	2	1
TDRs, balance | $	$ 5,070,000		$ 5,382,000	$ 59,000	$ 5,382,000	$ 59,000
Office | Commercial real estate | Extension at Below Market Terms
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	1		2	1
TDRs, balance | $	$ 5,070,000		$ 5,382,000	$ 59,000
Office | Commercial real estate | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	0		0	0
TDRs, balance | $	$ 0		$ 0	$ 0
Office | Commercial real estate | Modification to Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	1		1	0
TDRs, balance | $	$ 5,070,000		$ 5,070,000	$ 0
Office | Commercial real estate | Forgiveness of Debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	0		0	0
TDRs, balance | $	$ 0		$ 0	$ 0
Mixed use and other | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	2	0	4	1	5	1
TDRs, balance | $	$ 122,000	$ 0	$ 1,385,000	$ 85,000	$ 1,755,000	$ 85,000
Mixed use and other | Commercial real estate | Extension at Below Market Terms
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	1	0	3	1
TDRs, balance | $	$ 122,000	$ 0	$ 1,083,000	$ 85,000
Mixed use and other | Commercial real estate | Reduction of Interest Rate
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	0	0	0	1
TDRs, balance | $	$ 0	$ 0	$ 0	$ 85,000
Mixed use and other | Commercial real estate | Modification to Interest Only Payments
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	1	0	2	0
TDRs, balance | $	$ 121,000	$ 0	$ 423,000	$ 0
Mixed use and other | Commercial real estate | Forgiveness of Debt
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs, count | contracts	0	0	0	0
TDRs, balance | $	$ 0	$ 0	$ 0	$ 0

Allowance for Loan Losses, Al_9

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of TDRs Subsequent Default Under the Restructured Terms) (Detail) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019USD ($)contracts	Sep. 30, 2018USD ($)contracts	Sep. 30, 2019USD ($)contracts	Sep. 30, 2018USD ($)contracts	Sep. 30, 2019USD ($)contracts	Sep. 30, 2018USD ($)contracts
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
TDRs, count | contracts	68	22	127	41	157	49
TDRs, balance | $	$ 13,597	$ 4,233	$ 46,804	$ 24,828	$ 51,219	$ 43,767
Payments in default, count | contracts	18	13	23	13
Payments in default, balance | $	$ 6,545	$ 9,111	$ 18,692	$ 9,111
Commercial | Commercial, industrial and other
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
TDRs, count | contracts	5	1	18	4	18	5
TDRs, balance | $	$ 3,526	$ 519	$ 24,835	$ 13,442	$ 24,835	$ 15,714
Payments in default, count | contracts	3	3	6	3
Payments in default, balance | $	$ 1,743	$ 2,447	$ 13,348	$ 2,447
Commercial | Franchise
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
TDRs, count | contracts		1		3		6
TDRs, balance | $		$ 35		$ 5,157		$ 21,413
Payments in default, count | contracts		2		2
Payments in default, balance | $		$ 5,122		$ 5,122
Commercial | Asset-based lending
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
TDRs, count | contracts			1		2
TDRs, balance | $			$ 76		$ 206
Payments in default, count | contracts	2		2
Payments in default, balance | $	$ 206		$ 206
Commercial | Leases
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
TDRs, count | contracts		0		1		1
TDRs, balance | $		$ 0		$ 239		$ 239
Payments in default, count | contracts		0		0
Payments in default, balance | $		$ 0		$ 0
Commercial real estate | Office
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
TDRs, count | contracts	1		2	1	2	1
TDRs, balance | $	$ 5,070		$ 5,382	$ 59	$ 5,382	$ 59
Payments in default, count | contracts	1	0	1	0
Payments in default, balance | $	$ 312	$ 0	$ 312	$ 0
Commercial real estate | Mixed use and other
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
TDRs, count | contracts	2	0	4	1	5	1
TDRs, balance | $	$ 122	$ 0	$ 1,385	$ 85	$ 1,755	$ 85
Payments in default, count | contracts	1	1	2	1
Payments in default, balance | $	$ 370	$ 85	$ 672	$ 85
Residential real estate and other
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
TDRs, count | contracts	60	20	102	31	130	35
TDRs, balance | $	$ 4,879	$ 3,679	$ 15,126	$ 5,846	$ 19,041	$ 6,257
Payments in default, count | contracts	11	7	12	7
Payments in default, balance | $	$ 3,914	$ 1,457	$ 4,154	$ 1,457

Allowance for Loan Losses, A_10

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (TDRs Narrative) (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019USD ($)contracts	Sep. 30, 2018USD ($)contracts	Sep. 30, 2019USD ($)contracts	Sep. 30, 2018USD ($)contracts	Sep. 30, 2019USD ($)contracts	Sep. 30, 2018USD ($)contracts	Dec. 31, 2018USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans modified in TDRs	$ 66,308,000	$ 66,219,000	$ 66,308,000	$ 66,219,000	$ 66,308,000	$ 66,219,000	$ 66,102,000
TDRs, count | contracts	68	22	127	41	157	49
Allowance for loan losses related to impaired loans	$ 14,934,000	$ 14,365,000	$ 14,934,000	$ 14,365,000	$ 14,934,000	$ 14,365,000	$ 11,437,000
Foreclosed residential real estate properties	2,500,000		2,500,000		2,500,000
TDRs, balance	$ 13,597,000	$ 4,233,000	$ 46,804,000	$ 24,828,000	51,219,000	43,767,000
Weighted average extension term	13 months	72 months	14 months	64 months
Weighted average decrease in stated interest rate	1.61%	1.40%	2.05%	1.60%
Interest-only payment terms	9 months		5 months	7 months
Loan forgiveness	$ 0	$ 0	$ 0	$ 0
Financing Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans modified in TDRs	66,300,000		$ 66,300,000		66,300,000
TDRs, count | contracts			230
Allowance for loan losses related to impaired loans	5,900,000		$ 5,900,000		5,900,000
Residential Real Estate | Financing Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded investment, foreclosure proceedings in process	$ 12,600,000	$ 14,200,000	$ 12,600,000	$ 14,200,000	$ 12,600,000	$ 14,200,000

Goodwill And Other Intangible_3

Goodwill And Other Intangible Assets (Goodwill Assets by Business Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Goodwill [Roll Forward]
Beginning balance		$ 573,141
Goodwill Acquired		10,726
Impairment Loss		0
Goodwill Adjustments		448
Ending balance	$ 584,315	584,315
Community banking
Goodwill [Roll Forward]
Beginning balance		465,085
Goodwill Acquired	10,800	10,726
Impairment Loss		0
Goodwill Adjustments		123
Ending balance	475,934	475,934
Specialty finance
Goodwill [Roll Forward]
Beginning balance		38,343
Goodwill Acquired		0
Impairment Loss		0
Goodwill Adjustments		665
Ending balance	39,008	39,008
Wealth management
Goodwill [Roll Forward]
Beginning balance		69,713
Goodwill Acquired		0
Impairment Loss		0
Goodwill Adjustments		(340)
Ending balance	$ 69,373	$ 69,373

Goodwill And Other Intangible_4

Goodwill And Other Intangible Assets (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Indefinite-lived Intangible Assets [Line Items]
Goodwill recorded on acquisition			$ 10,726
Amortization of other intangible assets	$ 2,928	$ 1,163	8,827	$ 3,164
Community banking
Indefinite-lived Intangible Assets [Line Items]
Goodwill recorded on acquisition	$ 10,800		$ 10,726
Community banking | Core deposit intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets			10 years
Specialty finance
Indefinite-lived Intangible Assets [Line Items]
Goodwill recorded on acquisition			$ 0
Goodwill increase for foreign currency translation adjustments			$ 665
Specialty finance | Customer list intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets			18 years
Wealth management
Indefinite-lived Intangible Assets [Line Items]
Goodwill recorded on acquisition			$ 0
Goodwill, decrease for measurement period adjustments on acquisition			$ (340)
Wealth management | Customer list intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets			10 years

Goodwill And Other Intangible_5

Goodwill And Other Intangible Assets (Summary of Intangible Assets) (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Intangibles with finite lives
Accumulated amortization	$ (33,326)	$ (34,130)	$ (32,724)
Intangibles with indefinite lives
Gross carrying amount	76,983	83,554	60,102
Total net carrying amount	43,657	49,424	27,378
Community banking
Intangibles with indefinite lives
Total net carrying amount	29,963	31,760	22,053
Trademark | Community banking
Intangibles with indefinite lives
Carrying amount	5,800	5,800	5,800
Core deposit intangibles | Community banking
Intangibles with finite lives
Gross carrying amount	48,791	55,366	44,395
Accumulated amortization	(24,628)	(29,406)	(28,142)
Net carrying amount	24,163	25,960	16,253
Customer list intangibles | Specialty finance
Intangibles with finite lives
Gross carrying amount	1,962	1,958	1,967
Accumulated amortization	(1,526)	(1,436)	(1,407)
Net carrying amount	436	522	560
Customer list and other intangibles | Wealth management
Intangibles with finite lives
Gross carrying amount	20,430	20,430	7,940
Accumulated amortization	(7,172)	(3,288)	(3,175)
Net carrying amount	$ 13,258	$ 17,142	$ 4,765

Goodwill And Other Intangible_6

Goodwill And Other Intangible Assets (Estimated Amortization) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Actual in nine months ended September 30, 2019	$ 2,928	$ 1,163	$ 8,827	$ 3,164
Estimated remaining in 2019	2,844		2,844
Estimated—2020	10,105		10,105
Estimated—2021	6,852		6,852
Estimated—2022	5,368		5,368
Estimated—2023	$ 3,977		$ 3,977

Mortgage Servicing Rights ("M_3

Mortgage Servicing Rights ("MSRs") (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of the period	$ 72,850	$ 63,194	$ 75,183	$ 33,676
Additions from loans sold with servicing retained	14,029	11,340	30,411	23,388
Additions from acquisitions	0	0	407	13,806
Estimate of changes in fair value due to:
Payoffs and paydowns	(7,236)	(1,081)	(13,309)	(3,647)
Changes in valuation inputs or assumptions	(4,058)	1,077	(17,107)	7,307
Fair value at end of the period	75,585	74,530	75,585	74,530
Unpaid principal balance of mortgage loans serviced for others	$ 7,901,045	$ 5,904,300	$ 7,901,045	$ 5,904,300

Deposits (Detail)

Deposits (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Balance:
Non-interest bearing	$ 7,067,960	$ 6,569,880	$ 6,399,213
NOW and interest bearing demand deposits	2,966,098	2,897,133	2,512,259
Wealth management deposits	2,795,838	2,996,764	2,520,120
Money market	7,326,899	5,704,866	5,429,921
Savings	2,934,348	2,665,194	2,595,164
Time certificates of deposit	5,619,236	5,260,841	5,460,038
Total deposits	$ 28,710,379	$ 26,094,678	$ 24,916,715
Mix:
Non-interest bearing	25.00%	25.00%	26.00%
NOW and interest bearing demand deposits	10.00%	11.00%	10.00%
Wealth management deposits	10.00%	12.00%	10.00%
Money market	25.00%	22.00%	22.00%
Savings	10.00%	10.00%	10.00%
Time certificates of deposit	20.00%	20.00%	22.00%
Total deposits	100.00%	100.00%	100.00%

FHLB Advances, Other Borrowin_3

FHLB Advances, Other Borrowings and Subordinated Notes (Summary of Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Sep. 18, 2018	Dec. 15, 2014
Debt Disclosure [Abstract]
FHLB advances	$ 574,847	$ 426,326	$ 615,000
Other borrowings:
Notes payable	128,433	144,461	149,799	$ 150,000	$ 150,000
Short-term borrowings	9,677	50,593	17,431
Other	46,774	47,722	48,043
Secured borrowings	225,604	151,079	158,298
Total other borrowings	410,488	393,855	373,571
Subordinated notes	435,979	139,210	139,172
Total FHLB advances, other borrowings and subordinated notes	$ 1,421,314	$ 959,391	$ 1,127,743

FHLB Advances, Other Borrowin_4

FHLB Advances, Other Borrowings and Subordinated Notes (Summary of Pledged Securities Related to Securities Sold Under Repurchase Agreements) (Details) - Securities sold under repurchase agreements - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities sold under agreements to repurchase		$ 50,600	$ 17,400
Overnight Sweep Collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged financial instruments	$ 20,278
Excess collateral	10,601
Securities sold under agreements to repurchase	9,677
Overnight Sweep Collateral | Available-for-sale securities pledged | Mortgage-backed securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged financial instruments	4,431
Overnight Sweep Collateral | Available-for-sale securities pledged | Collateralized mortgage obligations
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged financial instruments	2,847
Overnight Sweep Collateral | Held-to-maturity securities pledged | U.S. Government agencies
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged financial instruments	$ 13,000

FHLB Advances, Other Borrowin_5

FHLB Advances, Other Borrowings and Subordinated Notes (Narrative) (Details) $ in Millions

1 Months Ended

3 Months Ended

9 Months Ended

24 Months Ended

48 Months Ended

54 Months Ended

62 Months Ended

65 Months Ended

May 31, 2019CAD ($)

Feb. 28, 2019CAD ($)

Jun. 30, 2018CAD ($)

Dec. 31, 2017CAD ($)

Dec. 31, 2015CAD ($)

Dec. 31, 2014CAD ($)

Jun. 30, 2019USD ($)

Sep. 30, 2019USD ($)buildingRate

Sep. 30, 2018USD ($)

Dec. 31, 2015CAD ($)

Dec. 31, 2017CAD ($)

Jun. 30, 2018CAD ($)

Feb. 28, 2019CAD ($)

May 31, 2019CAD ($)

Dec. 31, 2018USD ($)

Sep. 18, 2018USD ($)

Dec. 15, 2014USD ($)

Debt Instrument [Line Items]

Notes payable

$ 128,433,000

$ 149,799,000

$ 144,461,000

$ 150,000,000

$ 150,000,000

Short-term borrowings

9,677,000

17,431,000

50,593,000

Other borrowings

46,774,000

48,043,000

47,722,000

Secured borrowings

225,604,000

158,298,000

151,079,000

Subordinated notes

435,979,000

139,172,000

139,210,000

Proceeds from the issuance of subordinated notes, net

296,617,000

0

Term Facility

Debt Instrument [Line Items]

Notes payable

128,400,000

150,000,000

75,000,000

Revolving Credit Facility

Debt Instrument [Line Items]

Notes payable

50,000,000

$ 75,000,000

Proceeds from credit facility

$ 35,000,000

Amount outstanding

0

Subordinated debt maturing June 2029

Debt Instrument [Line Items]

Proceeds from the issuance of subordinated notes, net

296,700,000

Subordinated debt maturing June 2024

Debt Instrument [Line Items]

Subordinated notes

$ 139,300,000

Base Rate Loan | Base Rate | Term Facility

Debt Instrument [Line Items]

Basis spread on variable rate

0.75%

Base Rate Loan | Base Rate | Revolving Credit Facility

Debt Instrument [Line Items]

Basis spread on variable rate

0.50%

Base Rate Loan | Federal Funds Rate | Revolving Credit Facility

Debt Instrument [Line Items]

Basis spread on variable rate

0.50%

Base Rate Loan | Eurodollar rate | Revolving Credit Facility

Debt Instrument [Line Items]

Basis spread on variable rate

1.00%

Eurodollar Rate Loan | London Interbank Offered Rate (LIBOR) | Term Facility

Debt Instrument [Line Items]

Basis spread on variable rate

1.25%

Eurodollar Rate Loan | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility

Debt Instrument [Line Items]

Basis spread on variable rate

1.25%

Line of Credit | Credit Agreement

Debt Instrument [Line Items]

Loan agreement with unaffiliated banks

$ 200,000,000

Revolving Credit Facility

Debt Instrument [Line Items]

Commitment fee | Rate

0.20%

Securities sold under repurchase agreements

Debt Instrument [Line Items]

Securities sold under agreements to repurchase

17,400,000

50,600,000

Fixed Rate Promissory Note

Debt Instrument [Line Items]

Number of properties securing debt | building

2

Other borrowings

$ 46,800,000

48,000,000

47,700,000

Fixed interest rate

3.36%

Secured Debt

Debt Instrument [Line Items]

Secured borrowings

$ 14,200,000

Secured Debt | Receivables Purchase Agreement

Debt Instrument [Line Items]

Fixed interest rate

2.6808%

Proceeds from debt issuance

$ 70

$ 20

$ 20

$ 10

$ 10

$ 150

$ 160

$ 170

$ 190

$ 210

$ 280

Secured borrowings

$ 211,400,000

$ 147,200,000

$ 139,300,000

Subordinated Debt | Subordinated debt maturing June 2029

Debt Instrument [Line Items]

Fixed interest rate

4.85%

Principal amount of notes

$ 300,000,000

Subordinated Debt | Subordinated debt maturing June 2024

Debt Instrument [Line Items]

Fixed interest rate

5.00%

Overnight Sweep Collateral | Securities sold under repurchase agreements

Debt Instrument [Line Items]

Securities sold under agreements to repurchase

$ 9,677,000

Pledged financial instruments

$ 20,278,000

Junior Subordinated Debenture_2

Junior Subordinated Debentures (Summary of Junior Subordinated Debentures) (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Subordinated Borrowing [Line Items]
Junior Subordinated Debentures	$ 253,566,000	$ 253,566,000	$ 253,566,000
Junior Subordinated Debt
Subordinated Borrowing [Line Items]
Junior Subordinated Debentures	$ 253,566,000
Debt, Weighted Average Interest Rate	4.33%
Junior Subordinated Debt | Wintrust Capital Trust III
Subordinated Borrowing [Line Items]
Common Securities	$ 774,000
Trust Preferred Securities	25,000,000
Junior Subordinated Debentures	$ 25,774,000
Contractual rate	5.55%
Junior Subordinated Debt | Wintrust Capital Trust III | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate structure, spread on variable interest rate	3.25%
Junior Subordinated Debt | Wintrust Statutory Trust IV
Subordinated Borrowing [Line Items]
Common Securities	$ 619,000
Trust Preferred Securities	20,000,000
Junior Subordinated Debentures	$ 20,619,000
Contractual rate	4.90%
Junior Subordinated Debt | Wintrust Statutory Trust IV | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate structure, spread on variable interest rate	2.80%
Junior Subordinated Debt | Wintrust Statutory Trust V
Subordinated Borrowing [Line Items]
Common Securities	$ 1,238,000
Trust Preferred Securities	40,000,000
Junior Subordinated Debentures	$ 41,238,000
Contractual rate	4.70%
Junior Subordinated Debt | Wintrust Statutory Trust V | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate structure, spread on variable interest rate	2.60%
Junior Subordinated Debt | Wintrust Capital Trust VII
Subordinated Borrowing [Line Items]
Common Securities	$ 1,550,000
Trust Preferred Securities	50,000,000
Junior Subordinated Debentures	$ 51,550,000
Contractual rate	4.07%
Junior Subordinated Debt | Wintrust Capital Trust VII | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate structure, spread on variable interest rate	1.95%
Junior Subordinated Debt | Wintrust Capital Trust VIII
Subordinated Borrowing [Line Items]
Common Securities	$ 1,238,000
Trust Preferred Securities	25,000,000
Junior Subordinated Debentures	$ 26,238,000
Contractual rate	3.55%
Junior Subordinated Debt | Wintrust Capital Trust VIII | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate structure, spread on variable interest rate	1.45%
Junior Subordinated Debt | Wintrust Capital Trust IX
Subordinated Borrowing [Line Items]
Common Securities	$ 1,547,000
Trust Preferred Securities	50,000,000
Junior Subordinated Debentures	$ 51,547,000
Contractual rate	3.75%
Junior Subordinated Debt | Wintrust Capital Trust IX | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate structure, spread on variable interest rate	1.63%
Junior Subordinated Debt | Northview Capital Trust I
Subordinated Borrowing [Line Items]
Common Securities	$ 186,000
Trust Preferred Securities	6,000,000
Junior Subordinated Debentures	$ 6,186,000
Contractual rate	5.25%
Junior Subordinated Debt | Northview Capital Trust I | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate structure, spread on variable interest rate	3.00%
Junior Subordinated Debt | Town Bankshares Capital Trust I
Subordinated Borrowing [Line Items]
Common Securities	$ 186,000
Trust Preferred Securities	6,000,000
Junior Subordinated Debentures	$ 6,186,000
Contractual rate	5.25%
Junior Subordinated Debt | Town Bankshares Capital Trust I | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate structure, spread on variable interest rate	3.00%
Junior Subordinated Debt | First Northwest Capital Trust I
Subordinated Borrowing [Line Items]
Common Securities	$ 155,000
Trust Preferred Securities	5,000,000
Junior Subordinated Debentures	$ 5,155,000
Contractual rate	5.10%
Junior Subordinated Debt | First Northwest Capital Trust I | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate structure, spread on variable interest rate	3.00%
Junior Subordinated Debt | Suburban Illinois Capital Trust II
Subordinated Borrowing [Line Items]
Common Securities	$ 464,000
Trust Preferred Securities	15,000,000
Junior Subordinated Debentures	$ 15,464,000
Contractual rate	3.87%
Junior Subordinated Debt | Suburban Illinois Capital Trust II | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate structure, spread on variable interest rate	1.75%
Junior Subordinated Debt | Community Financial Shares Statutory Trust II
Subordinated Borrowing [Line Items]
Common Securities	$ 109,000
Trust Preferred Securities	3,500,000
Junior Subordinated Debentures	$ 3,609,000
Contractual rate	3.74%
Junior Subordinated Debt | Community Financial Shares Statutory Trust II | London Interbank Offered Rate (LIBOR)
Subordinated Borrowing [Line Items]
Rate structure, spread on variable interest rate	1.62%

Junior Subordinated Debenture_3

Junior Subordinated Debentures (Narrative) (Detail)	9 Months Ended
	Sep. 30, 2019USD ($)trustRate	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)
Subordinated Borrowing [Line Items]
Percentage ownership interest in subsidiary trusts	100.00%
Number of unconsolidated subsidiary trusts | trust	11
Common securities, approximate percentage of junior subordinated debentures	3.00%
Trust preferred securities, approximate percentage of junior subordinated debentures	97.00%
Junior subordinated debentures	$ 253,566,000	$ 253,566,000	$ 253,566,000
Period of deferred payment, not to exceed	60 months
Junior Subordinated Debt
Subordinated Borrowing [Line Items]
Junior subordinated debentures	$ 253,566,000
Weighted average contractual interest rate | Rate	4.33%
Tier two risk based capital	$ 245,500,000
Interest rate swaps | Junior Subordinated Debt
Subordinated Borrowing [Line Items]
Derivative notional amount	$ 210,000,000
Hedge-adjusted contractual interest rate	4.52%

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Disaggregation of Revenue by Source) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 40,834	$ 38,722	$ 120,281	$ 114,313
Mortgage broker fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	235	295	608	862
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	9,972	9,331	28,097	27,339
Administrative services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,086	1,099	3,125	3,365
Card related fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2,220	2,328	6,932	5,583
Other deposit related fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3,322	3,035	9,404	8,927
Wealth management
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	23,999	22,634	72,115	68,237
Wealth management | Brokerage and insurance product commissions
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4,686	5,579	13,966	17,394
Wealth management | Trust
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4,399	3,003	14,366	9,646
Wealth management | Asset management
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 14,914	$ 14,052	$ 43,783	$ 41,197

Revenue from Contracts with C_4

Revenue from Contracts with Customers (Contract Assets, Contract Liabilities and Receivables from Contracts with Customers) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Contract assets	$ 0	$ 0	$ 0
Contract liabilities	1,429	1,727	1,429
Mortgage broker fees receivable	23	44	9
Administrative services receivable	222	275	2,425
Wealth management receivable	9,285	13,610	7,779
Card related fees receivable	114	0	0
Total receivables from contracts with customer	$ 9,644	$ 13,929	$ 10,213

Revenue from Contracts with C_5

Revenue from Contracts with Customers (Performance Obligations Unsatisfied at End of Period) (Details) $ in Thousands	Sep. 30, 2019USD ($)
Revenue from Contract with Customer [Abstract]
Performance obligation unsatisfied or partially unsatisfied	$ 1,429
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Revenue from Contract with Customer [Abstract]
Performance obligation unsatisfied or partially unsatisfied	$ 277
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated remaining performance period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue from Contract with Customer [Abstract]
Performance obligation unsatisfied or partially unsatisfied	$ 553
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated remaining performance period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue from Contract with Customer [Abstract]
Performance obligation unsatisfied or partially unsatisfied	$ 303
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated remaining performance period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue from Contract with Customer [Abstract]
Performance obligation unsatisfied or partially unsatisfied	$ 153
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated remaining performance period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue from Contract with Customer [Abstract]
Performance obligation unsatisfied or partially unsatisfied	$ 143
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated remaining performance period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue from Contract with Customer [Abstract]
Performance obligation unsatisfied or partially unsatisfied	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated remaining performance period	1 year

Revenue from Contracts with C_6

Revenue from Contracts with Customers (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)subsidiary	Sep. 30, 2018USD ($)
Revenue from Contract with Customer [Abstract]
Number of wealth management subsidiaries | subsidiary	4
Revenue recognized from contract liability balance | $	$ 667	$ 278

Segment Information (Narrative)

Segment Information (Narrative) (Detail)	9 Months Ended
	Sep. 30, 2019segmentsubsidiary
Segment Reporting Information [Line Items]
Number of reportable segments	3
Number of subsidiaries | subsidiary	15
Community banking
Segment Reporting Information [Line Items]
Number of reportable segments	1

Segment Information (Summary of

Segment Information (Summary of Segment Information) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Net interest income:
Net interest income	$ 264,852	$ 247,563	$ 793,040	$ 710,815
Net interest income, Change in Contribution	$ 17,289		$ 82,225
Net interest income, Change in Contribution (as a percent)	7.00%		12.00%
Non-interest income:
Non-interest income	$ 115,137	99,930	$ 294,952	280,842
Non-interest income, Change in Contribution	$ 15,207		$ 14,110
Non-interest income, Change in Contribution (as a percent)	15.00%		5.00%
Net revenue:
Net revenue	$ 379,989	347,493	$ 1,087,992	991,657
Net revenue, Change in Contribution	$ 32,496		$ 96,335
Net revenue, Change in Contribution (as a percent)	9.00%		10.00%
Segment profit:
Segment profit	$ 99,121	91,948	$ 269,733	263,509
Segment profit, Change in Contribution	$ 7,173		$ 6,224
Segment profit, Change in Contribution (as a percent)	8.00%		2.00%
Segment assets:
Segment assets	$ 34,911,902	30,142,731	$ 34,911,902	30,142,731	$ 31,244,849
Segment assets, Change in Contribution	$ 4,769,171
Segment assets, Change in Contribution (as a percent)	16.00%
Community banking
Segment profit:
Segment profit	$ 68,792	63,735	182,553	187,395
Segment profit, Change in Contribution	$ 5,057		$ (4,842)
Segment profit, Change in Contribution (as a percent)	8.00%		(3.00%)
Segment assets:
Segment assets	$ 28,092,785	24,590,027	$ 28,092,785	24,590,027
Segment assets, Change in Contribution	$ 3,502,758
Segment assets, Change in Contribution (as a percent)	14.00%
Specialty finance
Segment profit:
Segment profit	$ 24,241	22,971	67,218	61,482
Segment profit, Change in Contribution	$ 1,270		$ 5,736
Segment profit, Change in Contribution (as a percent)	6.00%		9.00%
Segment assets:
Segment assets	$ 5,739,798	4,897,664	$ 5,739,798	4,897,664
Segment assets, Change in Contribution	$ 842,134
Segment assets, Change in Contribution (as a percent)	17.00%
Wealth management
Segment profit:
Segment profit	$ 6,088	5,242	19,962	14,632
Segment profit, Change in Contribution	$ 846		$ 5,330
Segment profit, Change in Contribution (as a percent)	16.00%		36.00%
Segment assets:
Segment assets	$ 1,079,319	655,040	$ 1,079,319	655,040
Segment assets, Change in Contribution	$ 424,279
Segment assets, Change in Contribution (as a percent)	65.00%
Operating Segments
Net interest income:
Net interest income	$ 259,340	242,881	776,614	696,759
Net interest income, Change in Contribution	$ 16,459		$ 79,855
Net interest income, Change in Contribution (as a percent)	7.00%		11.00%
Non-interest income:
Non-interest income	$ 127,295	110,274	$ 330,102	310,822
Non-interest income, Change in Contribution	$ 17,021		$ 19,280
Non-interest income, Change in Contribution (as a percent)	15.00%		6.00%
Net revenue:
Net revenue	$ 386,635	353,155	$ 1,106,716	1,007,581
Net revenue, Change in Contribution	$ 33,480		$ 99,135
Net revenue, Change in Contribution (as a percent)	9.00%		10.00%
Operating Segments | Community banking
Net interest income:
Net interest income	$ 209,912	202,435	$ 635,645	583,926
Net interest income, Change in Contribution	$ 7,477		$ 51,719
Net interest income, Change in Contribution (as a percent)	4.00%		9.00%
Non-interest income:
Non-interest income	$ 82,870	69,776	$ 196,507	192,028
Non-interest income, Change in Contribution	$ 13,094		$ 4,479
Non-interest income, Change in Contribution (as a percent)	19.00%		2.00%
Net revenue:
Net revenue	$ 292,782	272,211	$ 832,152	775,954
Net revenue, Change in Contribution	$ 20,571		$ 56,198
Net revenue, Change in Contribution (as a percent)	8.00%		7.00%
Operating Segments | Specialty finance
Net interest income:
Net interest income	$ 42,138	36,398	$ 119,241	100,104
Net interest income, Change in Contribution	$ 5,740		$ 19,137
Net interest income, Change in Contribution (as a percent)	16.00%		19.00%
Non-interest income:
Non-interest income	$ 20,003	16,963	$ 59,188	49,005
Non-interest income, Change in Contribution	$ 3,040		$ 10,183
Non-interest income, Change in Contribution (as a percent)	18.00%		21.00%
Net revenue:
Net revenue	$ 62,141	53,361	$ 178,429	149,109
Net revenue, Change in Contribution	$ 8,780		$ 29,320
Net revenue, Change in Contribution (as a percent)	16.00%		20.00%
Operating Segments | Wealth management
Net interest income:
Net interest income	$ 7,290	4,048	$ 21,728	12,729
Net interest income, Change in Contribution	$ 3,242		$ 8,999
Net interest income, Change in Contribution (as a percent)	80.00%		71.00%
Non-interest income:
Non-interest income	$ 24,422	23,535	$ 74,407	69,789
Non-interest income, Change in Contribution	$ 887		$ 4,618
Non-interest income, Change in Contribution (as a percent)	4.00%		7.00%
Net revenue:
Net revenue	$ 31,712	27,583	$ 96,135	82,518
Net revenue, Change in Contribution	$ 4,129		$ 13,617
Net revenue, Change in Contribution (as a percent)	15.00%		17.00%
Intersegment Eliminations
Net interest income:
Net interest income	$ 5,512	4,682	$ 16,426	14,056
Net interest income, Change in Contribution	$ 830		$ 2,370
Net interest income, Change in Contribution (as a percent)	18.00%		17.00%
Non-interest income:
Non-interest income	$ (12,158)	(10,344)	$ (35,150)	(29,980)
Non-interest income, Change in Contribution	$ (1,814)		$ (5,170)
Non-interest income, Change in Contribution (as a percent)	(18.00%)		(17.00%)
Net revenue:
Net revenue	$ (6,646)	$ (5,662)	$ (18,724)	$ (15,924)
Net revenue, Change in Contribution	$ (984)		$ (2,800)
Net revenue, Change in Contribution (as a percent)	(17.00%)		(18.00%)

Derivative Financial Instrume_3

Derivative Financial Instruments (Schedule Of Fair Value Of Derivative Financial Instruments) (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Derivative [Line Items]
Derivative assets	$ 138,286	$ 73,172	$ 96,153
Derivative liabilities	171,009	68,088	71,381
Interest Rate Contract
Derivative [Line Items]
Derivative assets	134,386	68,425	91,262
Derivative liabilities	168,897	62,571	69,342
Designated as Hedging Instrument
Derivative [Line Items]
Derivative assets	256	8,906	21,397
Derivative liabilities	34,734	3,412	0
Designated as Hedging Instrument | Interest Rate Contract | Cash Flow Hedging
Derivative [Line Items]
Derivative assets	0	6,270	16,271
Derivative liabilities	25,895	1,656	0
Designated as Hedging Instrument | Interest Rate Contract | Fair Value Hedging
Derivative [Line Items]
Derivative assets	256	2,636	5,126
Derivative liabilities	8,839	1,756	0
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative assets	138,030	64,266	74,756
Derivative liabilities	136,275	64,676	71,381
Not Designated as Hedging Instrument | Interest Rate Contract
Derivative [Line Items]
Derivative assets	134,130	59,519	69,865
Derivative liabilities	134,163	59,159	69,342
Not Designated as Hedging Instrument | Interest Rate Lock Commitments
Derivative [Line Items]
Derivative assets	3,373	3,405	4,128
Derivative liabilities	148	2,694	0
Not Designated as Hedging Instrument | Forward Commitments to Sell Mortgage Loans
Derivative [Line Items]
Derivative assets	176	0	12
Derivative liabilities	1,658	1,486	1,330
Not Designated as Hedging Instrument | Foreign Exchange Contract
Derivative [Line Items]
Derivative assets	351	1,342	751
Derivative liabilities	$ 306	$ 1,337	$ 709

Derivative Financial Instrume_4

Derivative Financial Instruments (Narrative) (Detail)	9 Months Ended
	Sep. 30, 2019USD ($)derivative_instruments	Dec. 31, 2018derivative_instruments	Sep. 30, 2018derivative_instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount to be reclassified from accumulated other comprehensive income to interest expense in the next twelve months	$ 3,200,000
Net derivative liability position, aggregate fair value	164,900,000
Interest Rate Contract | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	7,200,000,000
Forward Commitments to Sell Mortgage Loans | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	904,400,000
Interest Rate Lock Commitments | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	525,700,000
Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 38,900,000
Covered Call Options | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Number of derivative instruments held | derivative_instruments	0	0	0
Mortgage banking derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Number of derivative instruments held | derivative_instruments	0
Cash Flow Hedging | Cash flow hedge of variable rate liabilities | Interest Rate Swap | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate derivatives held | derivative_instruments	15
Cash Flow Hedging | Cash flow hedge of variable rate liabilities | Interest Rate Collar | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Number of derivative instruments held | derivative_instruments	1
Fair Value Hedging | Interest Rate Swap | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate derivatives held | derivative_instruments	15
Notional amount	$ 158,100,000
Fair Value Hedging | Interest Rate Swap | Effective subsequent to period end | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate derivatives held | derivative_instruments	1
Notional amount	$ 6,900,000

Derivative Financial Instrume_5

Derivative Financial Instruments (Schedule Of Cash Flow Hedging Instruments) (Detail) - Cash Flow Hedging - Designated as Hedging Instrument	Sep. 30, 2019USD ($)
October 2021
Derivative [Line Items]
Notional	$ 25,000,000
Fair Value - Asset (Liability)	(386,000)
November 2021
Derivative [Line Items]
Notional	20,000,000
Fair Value - Asset (Liability)	(334,000)
December 2021
Derivative [Line Items]
Notional	165,000,000
Fair Value - Asset (Liability)	(2,841,000)
May 2022
Derivative [Line Items]
Notional	370,000,000
Fair Value - Asset (Liability)	(6,628,000)
June 2022
Derivative [Line Items]
Notional	160,000,000
Fair Value - Asset (Liability)	(2,796,000)
July 2022
Derivative [Line Items]
Notional	230,000,000
Fair Value - Asset (Liability)	(4,027,000)
August 2022
Derivative [Line Items]
Notional	235,000,000
Fair Value - Asset (Liability)	(4,196,000)
September 2023
Derivative [Line Items]
Notional	128,571,000
Fair Value - Asset (Liability)	(4,687,000)
Total Cash Flow Hedges
Derivative [Line Items]
Notional	1,333,571,000
Fair Value - Asset (Liability)	$ (25,895,000)

Derivative Financial Instrume_6

Derivative Financial Instruments (Rollforward Of Amounts In Accumulated Other Comprehensive Income Related To Interest Rate Swaps Designated As Cash Flow Hedges) (Detail) - Interest Rate Contract - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]
Unrealized (loss) gain at beginning of period	$ (16,422)	$ 16,059	$ 10,742	$ 11,902
Amount reclassified from accumulated other comprehensive income to interest expense on deposits and other borrowings	(2,428)	(2,319)	(10,071)	(4,338)
Amount of (loss) gain recognized in other comprehensive income	(4,420)	2,531	(23,941)	8,707
Unrealized (loss) gain at end of period	$ (23,270)	$ 16,271	$ (23,270)	$ 16,271

Derivative Financial Instrume_7

Derivative Financial Instruments (Schedule of Carrying Amount of Hedged Assets/(Liabilities)) (Detail) - Interest Rate Swap $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2019USD ($)
Loans, net of unearned income
Derivative [Line Items]
Carrying Amount of the Hedged Assets/(Liabilities)	$ 165,226	$ 165,226
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)	8,458	8,458
Cumulative Amount of Fair Value Hedging Adjustment Remaining for any Hedged Assets (Liabilities) for which Hedge Accounting has been Discontinued	0	0
Available-for-sale debt securities
Derivative [Line Items]
Carrying Amount of the Hedged Assets/(Liabilities)	1,442	1,442
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)	101	101
Cumulative Amount of Fair Value Hedging Adjustment Remaining for any Hedged Assets (Liabilities) for which Hedge Accounting has been Discontinued	0	0
Interest and fees on loans
Derivative [Line Items]
Location of (Loss)/Gain Recognized in Income on Derivative	(2)	(42)
Interest income - investment securities
Derivative [Line Items]
Location of (Loss)/Gain Recognized in Income on Derivative	$ 0	$ 0

Derivative Financial Instrume_8

Derivative Financial Instruments (Summary Amounts Included In Consolidated Statement Of Income Related To Derivatives) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest rate swaps and caps | Trading (losses) gains, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ (75)	$ (55)	$ (392)	$ 89
Mortgage banking derivatives | Mortgage banking revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	1,026	(1,122)	1,089	858
Foreign exchange contracts | Trading (losses) gains, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	54	(18)	72	51
Covered call options | Fees from covered call options
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	0	627	2,427	2,893
Derivative contract held as economic hedge on MSRs | Mortgage banking revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ 82	$ 0	$ 1,002	$ 0

Derivative Financial Instrume_9

Derivative Financial Instruments (Derivative Asset and Liability Balance Sheet Offsetting) (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Offsetting Assets [Line Items]
Gross Amounts Recognized	$ 138,286	$ 73,172	$ 96,153
Derivative Liabilities
Gross Amounts Recognized	171,009	68,088	71,381
Interest Rate Contract
Offsetting Assets [Line Items]
Gross Amounts Recognized	134,386	68,425	91,262
Less: Amounts offset in the Statements of Financial Condition	0	0	0
Net amount presented in the Statements of Financial Condition	134,386	68,425	91,262
Gross amounts not offset in the Statements of Financial Condition
Offsetting Derivative Positions	(1,572)	(28,124)	(7,887)
Collateral Posted	0	(23,810)	(76,530)
Net Credit Exposure	132,814	16,491	6,845
Derivative Liabilities
Gross Amounts Recognized	168,897	62,571	69,342
Less: Amounts offset in the Statements of Financial Condition	0	0	0
Net amount presented in the Statements of Financial Condition	168,897	62,571	69,342
Gross amounts not offset in the Statements of Financial Condition
Offsetting Derivative Positions	(1,572)	(28,124)	(7,887)
Collateral Posted	(167,325)	(2,640)	(340)
Net Credit Exposure	$ 0	$ 31,807	$ 61,115

Fair Values of Assets and Lia_3

Fair Values of Assets and Liabilities (Narrative) (Detail) $ in Thousands	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2017USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	$ 2,270,059		$ 2,126,081	$ 2,164,985
Loans held-for-investment	116,022			77,883
MSRs	75,585	$ 72,850	75,183	74,530	$ 63,194	$ 33,676
Mortgage loans held-for-sale, at fair value	464,727		264,070	338,111
Impaired loans—collateral based	130,823		127,269	132,522
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	2,270,059		2,126,081	2,164,985
Remaining contractual principal balance outstanding, mortgage loans held-for-sale	460,400		253,700	317,400
Mortgage loans held-for-sale, at fair value	464,727		264,070	338,111
Portion at Other than Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans—collateral based	39,700
Non-performing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale, at fair value	$ 1,300		1,900	622
Appraisal adjustment - cost of sale | Other real estate owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned, measurement input	0.10
Measured at fair value on a recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-investment	$ 116,022		93,857	77,883
MSRs	75,585		75,183	74,530
Mortgage loans held-for-sale, at fair value	464,727		264,070	338,111
Measured at fair value on a non-recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans—collateral based	91,103
Other real estate owned	17,482
Level 3 | Measured at fair value on a recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-investment	9,999		11,347	13,456
MSRs	75,585		75,183	74,530
Derivative assets	3,000
Mortgage loans held-for-sale, at fair value	$ 0		0	0
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Weighted Average of Inputs | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	0.0996
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Weighted Average of Inputs | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.0336
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Weighted Average of Inputs | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.0996
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Minimum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	0.09
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Minimum | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.03
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Minimum | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.09
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Maximum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	0.19
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Maximum | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.04
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Maximum | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.19
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Weighted Average of Inputs | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.0135
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Minimum | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Maximum | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.07
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.1503
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Weighted Average of Inputs | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	0.1503
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Weighted Average of Inputs | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.1503
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Minimum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	0
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Minimum | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Maximum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	0.93
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) | Maximum | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.93
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing | Weighted Average of Inputs | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	77
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing | Minimum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	70
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing | Maximum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	200
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Weighted Average of Inputs | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	399
Level 3 | Measured at fair value on a recurring basis: | Pull-through rate | Weighted Average of Inputs | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, measurement input	0.75
Level 3 | Measured at fair value on a recurring basis: | Pull-through rate | Minimum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, measurement input	0
Level 3 | Measured at fair value on a recurring basis: | Pull-through rate | Maximum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, measurement input	1
Level 3 | Measured at fair value on a non-recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans—collateral based	$ 91,103
Other real estate owned	17,482
Municipal Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	146,104		138,490	133,373
Municipal Securities | Measured at fair value on a recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	146,104		138,490	133,373
Municipal Securities | Level 3 | Measured at fair value on a recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	113,058		108,926	97,586
U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	225,459		140,307	111,020
U.S. Government agencies | Measured at fair value on a recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	225,459		140,307	111,020
U.S. Government agencies | Level 3 | Measured at fair value on a recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	$ 2,811		$ 3,150	$ 3,315

Fair Values of Assets and Lia_4

Fair Values of Assets and Liabilities (Summary of Balances of Assets and Liabilities Measured at Fair Value On A Recurring Basis) (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 2,270,059		$ 2,126,081	$ 2,164,985
Trading account securities	3,204		1,692	688
Equity securities with readily determinable fair value	46,086		34,717	36,414
Mortgage loans held-for-sale, at fair value	464,727		264,070	338,111
Loans held-for-investment	116,022			77,883
MSRs	75,585	$ 72,850	75,183	74,530	$ 63,194	$ 33,676
U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	221,670		126,404	124,761
U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	225,459		140,307	111,020
Municipal Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	146,104		138,490	133,373
Measured at fair value on a recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities	3,204		1,692	688
Equity securities with readily determinable fair value	46,086		34,717	36,414
Mortgage loans held-for-sale, at fair value	464,727		264,070	338,111
Loans held-for-investment	116,022		93,857	77,883
MSRs	75,585		75,183	74,530
Nonqualified deferred compensation assets	13,750		11,282	12,503
Derivative assets	138,286		73,172	96,153
Total financial assets	3,127,719		2,680,054	2,801,267
Derivative liabilities	171,009		68,088	71,381
Measured at fair value on a recurring basis: | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	221,670		126,404	124,761
Measured at fair value on a recurring basis: | U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	225,459		140,307	111,020
Measured at fair value on a recurring basis: | Municipal Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	146,104		138,490	133,373
Measured at fair value on a recurring basis: | Corporate notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	94,004		91,045	93,453
Measured at fair value on a recurring basis: | Mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,582,822		1,629,835	1,702,378
Measured at fair value on a recurring basis: | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities	0		0	0
Equity securities with readily determinable fair value	38,020		0	0
Mortgage loans held-for-sale, at fair value	0		0	0
Loans held-for-investment	0		0	0
MSRs	0		0	0
Nonqualified deferred compensation assets	0		0	0
Derivative assets	0		0	0
Total financial assets	259,690		126,404	0
Derivative liabilities	0		0	0
Measured at fair value on a recurring basis: | Level 1 | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	221,670		126,404	0
Measured at fair value on a recurring basis: | Level 1 | U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0	0
Measured at fair value on a recurring basis: | Level 1 | Municipal Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0	0
Measured at fair value on a recurring basis: | Level 1 | Corporate notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0	0
Measured at fair value on a recurring basis: | Level 1 | Mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0	0
Measured at fair value on a recurring basis: | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities	3,204		1,692	688
Equity securities with readily determinable fair value	8,066		34,717	36,414
Mortgage loans held-for-sale, at fair value	464,727		264,070	338,111
Loans held-for-investment	106,023		82,510	64,427
MSRs	0		0	0
Nonqualified deferred compensation assets	13,750		11,282	12,503
Derivative assets	135,307		70,715	93,661
Total financial assets	2,663,597		2,352,587	2,609,888
Derivative liabilities	171,009		68,088	71,381
Measured at fair value on a recurring basis: | Level 2 | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0	124,761
Measured at fair value on a recurring basis: | Level 2 | U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	222,648		137,157	107,705
Measured at fair value on a recurring basis: | Level 2 | Municipal Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	33,046		29,564	35,787
Measured at fair value on a recurring basis: | Level 2 | Corporate notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	94,004		91,045	93,453
Measured at fair value on a recurring basis: | Level 2 | Mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,582,822		1,629,835	1,702,378
Measured at fair value on a recurring basis: | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities	0		0	0
Equity securities with readily determinable fair value	0		0	0
Mortgage loans held-for-sale, at fair value	0		0	0
Loans held-for-investment	9,999		11,347	13,456
MSRs	75,585		75,183	74,530
Nonqualified deferred compensation assets	0		0	0
Derivative assets	2,979		2,457	2,492
Total financial assets	204,432		201,063	191,379
Derivative liabilities	0		0	0
Measured at fair value on a recurring basis: | Level 3 | U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0	0
Measured at fair value on a recurring basis: | Level 3 | U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	2,811		3,150	3,315
Measured at fair value on a recurring basis: | Level 3 | Municipal Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	113,058		108,926	97,586
Measured at fair value on a recurring basis: | Level 3 | Corporate notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0		0	0
Measured at fair value on a recurring basis: | Level 3 | Mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 0		$ 0	$ 0

Fair Values of Assets and Lia_5

Fair Values of Assets and Liabilities (Summary of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Loans held-for- investment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 10,481	$ 13,764	$ 11,347	$ 33,717
Net Income	86	(32)	371	(1,420)
Other comprehensive income (loss)	0	0	0	0
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(1,203)	(1,520)	(2,554)	(24,177)
Net transfers into/(out of) Level 3	635	1,244	835	5,336
Ending Balance	9,999	13,456	9,999	13,456
Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	72,850	63,194	75,183	33,676
Net Income	2,735	11,336	(5)	27,048
Other comprehensive income (loss)	0	0	0	0
Purchases	0	0	407	13,806
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Net transfers into/(out of) Level 3	0	0	0	0
Ending Balance	75,585	74,530	75,585	74,530
Derivative Assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	3,596	3,819	2,457	2,157
Net Income	(617)	(1,327)	522	335
Other comprehensive income (loss)	0	0	0	0
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Net transfers into/(out of) Level 3	0	0	0	0
Ending Balance	2,979	2,492	2,979	2,492
Municipal Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	110,296	96,566	108,926	77,181
Net Income	0	0	0	0
Other comprehensive income (loss)	(1,722)	(2,573)	6,334	(5,658)
Purchases	5,668	4,830	7,192	31,846
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(1,184)	(1,237)	(9,394)	(5,783)
Net transfers into/(out of) Level 3	0	0	0	0
Ending Balance	113,058	97,586	113,058	97,586
U.S. Government agencies
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2,977	3,482	3,150	3,779
Net Income	0	0	0	0
Other comprehensive income (loss)	(9)	(9)	134	(306)
Purchases	0	0	0	0
Issuances	0	0	0	0
Sales	0	0	0	0
Settlements	(157)	(158)	(473)	(158)
Net transfers into/(out of) Level 3	0	0	0	0
Ending Balance	$ 2,811	$ 3,315	$ 2,811	$ 3,315

Fair Values of Assets and Lia_6

Fair Values of Assets and Liabilities (Summary of Assets Measured at Fair Value on a Nonrecurring Basis) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans—collateral based	$ 130,823	$ 130,823	$ 127,269	$ 132,522
Fair Value Losses Recognized, Impaired loans—collateral based	9,159	32,139
Fair Value Losses Recognized, Other real estate owned	862	2,468
Fair Value Losses Recognized, Total	10,021	34,607
Measured at fair value on a non-recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans—collateral based	91,103	91,103
Other real estate owned	17,482	17,482
Total financial assets	108,585	108,585
Measured at fair value on a non-recurring basis: | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans—collateral based	0	0
Other real estate owned	0	0
Total financial assets	0	0
Measured at fair value on a non-recurring basis: | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans—collateral based	0	0
Other real estate owned	0	0
Total financial assets	0	0
Measured at fair value on a non-recurring basis: | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans—collateral based	91,103	91,103
Other real estate owned	17,482	17,482
Total financial assets	$ 108,585	$ 108,585

Fair Values of Assets and Lia_7

Fair Values of Assets and Liabilities (Schedule of Valuation Techniques and Significant Unobservable Inputs Used to Measure Both Recurring and Non-Recurring) (Detail)	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2017USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities, at fair value	$ 2,270,059,000		$ 2,126,081,000	$ 2,164,985,000
Loans held-for-investment	116,022,000			77,883,000
MSRs	75,585,000	$ 72,850,000	75,183,000	74,530,000	$ 63,194,000	$ 33,676,000
Impaired loans—collateral based	130,823,000		127,269,000	132,522,000
Municipal Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities, at fair value	146,104,000		138,490,000	133,373,000
U.S. Government agencies
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities, at fair value	225,459,000		140,307,000	111,020,000
Measured at fair value on a recurring basis:
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment	116,022,000		93,857,000	77,883,000
MSRs	75,585,000		75,183,000	74,530,000
Derivative assets	138,286,000		73,172,000	96,153,000
Measured at fair value on a recurring basis: | Municipal Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities, at fair value	146,104,000		138,490,000	133,373,000
Measured at fair value on a recurring basis: | U.S. Government agencies
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities, at fair value	225,459,000		140,307,000	111,020,000
Measured at fair value on a non-recurring basis:
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans—collateral based	91,103,000
Other real estate owned	17,482,000
Level 3 | Measured at fair value on a recurring basis:
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment	9,999,000		11,347,000	13,456,000
MSRs	75,585,000		75,183,000	74,530,000
Derivative assets	2,979,000		2,457,000	2,492,000
Level 3 | Measured at fair value on a recurring basis: | Municipal Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities, at fair value	113,058,000		108,926,000	97,586,000
Level 3 | Measured at fair value on a recurring basis: | U.S. Government agencies
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities, at fair value	2,811,000		$ 3,150,000	$ 3,315,000
Level 3 | Measured at fair value on a non-recurring basis:
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans—collateral based	91,103,000
Other real estate owned	$ 17,482,000
Discount rate | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, measurement input	0.03
MSRs, measurement input	0.09
Discount rate | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, measurement input	0.04
MSRs, measurement input	0.19
Discount rate | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Weighted Average of Inputs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, measurement input	0.0336
MSRs, measurement input	0.0996
Credit discount | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, measurement input	0
Credit discount | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, measurement input	0.07
Credit discount | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Weighted Average of Inputs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, measurement input	0.0135
Constant prepayment rate (CPR) | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis:
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, measurement input	0.1503
Constant prepayment rate (CPR) | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSRs, measurement input	0
Constant prepayment rate (CPR) | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSRs, measurement input	0.93
Constant prepayment rate (CPR) | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Weighted Average of Inputs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment, measurement input	0.1503
MSRs, measurement input	0.1503
Cost of servicing | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSRs, measurement input	70
Cost of servicing | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSRs, measurement input	200
Cost of servicing | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Weighted Average of Inputs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSRs, measurement input	77
Cost of servicing - delinquent | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing Asset, Measurement Input, Cost	$ 200
Cost of servicing - delinquent | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing Asset, Measurement Input, Cost	$ 1,000
Cost of servicing - delinquent | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Weighted Average of Inputs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSRs, measurement input	399
Pull-through rate | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivatives, measurement input	0
Pull-through rate | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivatives, measurement input	1
Pull-through rate | Discounted cash flows | Level 3 | Measured at fair value on a recurring basis: | Weighted Average of Inputs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivatives, measurement input	0.75
Appraisal adjustment - cost of sale | Appraisal value | Level 3 | Measured at fair value on a non-recurring basis:
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans—collateral based, measurement input	0.10
Other real estate owned, measurement input	0.10
Appraisal adjustment - cost of sale | Appraisal value | Level 3 | Measured at fair value on a non-recurring basis: | Weighted Average of Inputs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans—collateral based, measurement input	0.1000
Other real estate owned, measurement input	0.1000

Fair Values of Assets and Lia_8

Fair Values of Assets and Liabilities (Summary Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest bearing deposits with banks	$ 2,260,806	$ 1,099,594	$ 1,137,044
Available-for-sale securities	2,270,059	2,126,081	2,164,985
Held-to-maturity securities	1,104,903	1,036,096	911,597
Trading account securities	3,204	1,692	688
Equity securities with readily determinable fair value	46,086	34,717	36,414
FHLB and FRB stock, at cost	92,714	91,354	99,998
Brokerage customer receivables	14,943	12,609	15,649
Mortgage loans held-for-sale, at fair value	464,727	264,070	338,111
Accrued interest receivable and other	1,087,864	696,707	700,568
FHLB advances	574,847	426,326	615,000
Other borrowings	410,488	393,855	373,571
Subordinated notes	435,979	139,210	139,172
Junior subordinated debentures	253,566	253,566	253,566
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	448,814	392,200	279,993
Interest bearing deposits with banks	2,260,806	1,099,594	1,137,044
Available-for-sale securities	2,270,059	2,126,081	2,164,985
Held-to-maturity securities	1,095,802	1,067,439	966,438
Trading account securities	3,204	1,692	688
Equity securities with readily determinable fair value	46,086	34,717	36,414
FHLB and FRB stock, at cost	92,714	91,354	99,998
Brokerage customer receivables	14,943	12,609	15,649
Mortgage loans held-for-sale, at fair value	464,727	264,070	338,111
Loans held-for-investment, at fair value	116,022	93,857	77,883
Loans held-for-investment, at amortized cost	25,594,149	23,726,834	23,046,068
Nonqualified deferred compensation assets	13,750	11,282	12,503
Derivative assets	138,286	73,172	96,153
Accrued interest receivable and other	272,072	260,281	254,879
Total financial assets	32,831,434	29,255,182	28,526,806
Non-maturity deposits	23,091,143	20,833,837	19,456,677
Deposits with stated maturities	5,619,236	5,260,841	5,460,038
FHLB advances	574,847	426,326	615,000
Other borrowings	410,488	393,855	373,571
Subordinated notes	435,979	139,210	139,172
Junior subordinated debentures	253,566	253,566	253,566
Derivative liabilities	171,009	68,088	71,381
Accrued interest payable	22,899	16,025	15,374
Total financial liabilities	30,579,167	27,391,748	26,384,779
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	448,814	392,200	279,993
Interest bearing deposits with banks	2,260,806	1,099,594	1,137,044
Available-for-sale securities	2,270,059	2,126,081	2,164,985
Held-to-maturity securities	1,104,903	1,036,096	911,597
Trading account securities	3,204	1,692	688
Equity securities with readily determinable fair value	46,086	34,717	36,414
FHLB and FRB stock, at cost	92,714	91,354	99,998
Brokerage customer receivables	14,943	12,609	15,649
Mortgage loans held-for-sale, at fair value	464,727	264,070	338,111
Loans held-for-investment, at fair value	116,022	93,857	77,883
Loans held-for-investment, at amortized cost	25,472,310	23,780,739	23,261,545
Nonqualified deferred compensation assets	13,750	11,282	12,503
Derivative assets	138,286	73,172	96,153
Accrued interest receivable and other	272,072	260,281	254,879
Total financial assets	32,718,696	29,277,744	28,687,442
Non-maturity deposits	23,091,143	20,833,837	19,456,677
Deposits with stated maturities	5,635,597	5,283,063	5,475,048
FHLB advances	620,136	429,830	615,342
Other borrowings	410,488	393,855	373,571
Subordinated notes	451,947	138,345	146,838
Junior subordinated debentures	254,426	263,846	258,488
Derivative liabilities	171,009	68,088	71,381
Accrued interest payable	22,899	16,025	15,374
Total financial liabilities	$ 30,657,645	$ 27,426,889	$ 26,412,719

Stock-Based Compensation Plan_2

Stock-Based Compensation Plans (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	May 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved for issuance (in shares)					5,485,000
Shares available for future grants (in shares)	2,800,000		2,800,000
Number of stock options granted			0	0
Stock-based compensation expense	$ 2	$ 3.2	$ 8.3	$ 10.3
Aggregate intrinsic value of options exercised			3.8	12.9
Cash received from option exercises			$ 4.3	$ 11.2
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term			7 years
Stock options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Stock options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			5 years
Restricted shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			1 year
Restricted shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			5 years
LTIP awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance based award payouts			0.00%
LTIP awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of performance based award payouts			150.00%
Performance-based stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Awards vested and issued in excess of target (in shares)			33,950

Stock-Based Compensation Plan_3

Stock-Based Compensation Plans (Summary Of Stock Option Activity) (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Common Shares
Common Shares, Outstanding at beginning of the period (in shares)	795,014	1,084,756
Common Shares, Granted (in shares)	0	0
Common Shares, Exercised (in shares)	(112,230)	(271,674)
Common Shares, Forfeited or canceled (in shares)	0	(6,942)
Common Shares, Outstanding at end of the period (in shares)	682,784	806,140
Common Shares, Exercisable (in shares)	667,664	609,752
Weighted Average Strike Price
Weighted Average Strike Price, Outstanding at beginning of period (usd per share)	$ 42.26	$ 41.98
Weighted Average Strike Price, Granted (usd per share)	0	0
Weighted Average Strike Price, Exercised (usd per share)	38.64	41.36
Weighted Average Strike Price, Forfeited or canceled (usd per share)	0	39.81
Weighted Average Strike Price, Outstanding at end of period (usd per share)	42.85	42.20
Weighted Average Strike Price, Exercisable (usd per share)	$ 42.81	$ 42.42
Remaining Contractual Term, Outstanding	2 years 4 months 24 days	3 years 3 months 18 days
Remaining Contractual Term, Exercisable	2 years 4 months 24 days	3 years
Intrinsic Value, Outstanding	$ 14,873	$ 34,452
Intrinsic Value, Exercisable	$ 14,565	$ 25,924

Stock-Based Compensation Plan_4

Stock-Based Compensation Plans (Summary Of Plans' Restricted Share And Performance-Vested Stock Award Activity) (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Restricted shares
Common Shares
Outstanding Beginning of the Period (in shares)	143,263	127,787
Granted (in shares)	13,099	28,506
Vested and issued (in shares)	(15,257)	(10,438)
Forfeited or canceled (in shares)	(1,691)	(982)
Outstanding End of the Period (in shares)	139,414	144,873
Vested, but not issuable (in shares)	91,505	90,294
Weighted Average Grant-Date Fair Value
Beginning Weighted Average Grant-Date Fair Value (usd per share)	$ 60.80	$ 53.33
Weighted Average Grant-Date Fair Value, Granted (usd per share)	71.66	87.65
Weighted Average Grant-Date Fair Value, Vested and issued (usd per share)	76.69	56.88
Weighted Average Grant-Date Fair Value, Forfeited or canceled (usd per share)	79.50	55.39
Ending Weighted Average Grant-Date Fair Value (usd per share)	59.85	59.82
Weighted Average Grant-Date Fair Value, Vested, but not issuable (usd per share)	$ 52.13	$ 51.88
Performance-based stock
Common Shares
Outstanding Beginning of the Period (in shares)	396,855	359,196
Granted (in shares)	175,696	134,326
Vested and issued (in shares)	(94,288)	(82,307)
Forfeited or canceled (in shares)	(10,430)	(13,582)
Outstanding End of the Period (in shares)	467,833	397,633
Vested, but not issuable (in shares)	33,701	21,477
Weighted Average Grant-Date Fair Value
Beginning Weighted Average Grant-Date Fair Value (usd per share)	$ 67.71	$ 54.37
Weighted Average Grant-Date Fair Value, Granted (usd per share)	71.57	88.28
Weighted Average Grant-Date Fair Value, Vested and issued (usd per share)	41	44.39
Weighted Average Grant-Date Fair Value, Forfeited or canceled (usd per share)	74.70	59.18
Ending Weighted Average Grant-Date Fair Value (usd per share)	74.38	67.72
Weighted Average Grant-Date Fair Value, Vested, but not issuable (usd per share)	$ 42.92	$ 43.52

Shareholders' Equity And Earn_3

Shareholders' Equity And Earnings Per Share (Components Of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	Jan. 01, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance	$ 2,976,939	$ 3,446,950	$ 3,106,871	$ 3,267,570	$ 2,976,939
Cumulative effect adjustment from the adoption of ASU 2018-02	(2,974)
Other comprehensive income (loss) during the period, net of tax, before reclassifications		8,667	(9,484)	46,309	(43,248)
Amount reclassified from accumulated other comprehensive loss into net income, net of tax		(2,073)	(2,426)	(8,012)	(3,177)
Amount reclassified from accumulated other comprehensive loss related to amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale, net of tax		(42)	(24)	(302)	(36)
Total other comprehensive income (loss)		6,552	(11,934)	37,995	(46,461)
Balance		3,540,325	3,179,822	3,540,325	3,179,822
Accumulated Unrealized Losses on Securities
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance	(15,813)	4,209	(54,885)	(42,353)	(15,813)
Cumulative effect adjustment from the adoption of ASU 2018-02	(4,517)
Other comprehensive income (loss) during the period, net of tax, before reclassifications		13,371	(13,277)	60,527	(46,665)
Amount reclassified from accumulated other comprehensive loss into net income, net of tax		(292)	(730)	(626)	(5)
Amount reclassified from accumulated other comprehensive loss related to amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale, net of tax		(42)	(24)	(302)	(36)
Total other comprehensive income (loss)		13,037	(14,031)	59,599	(46,706)
Balance		17,246	(68,916)	17,246	(68,916)
Accumulated Unrealized Gains on Derivative Instruments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance	7,164	(12,044)	11,748	7,857	7,164
Cumulative effect adjustment from the adoption of ASU 2018-02	1,543
Other comprehensive income (loss) during the period, net of tax, before reclassifications		(3,233)	1,851	(17,529)	6,368
Amount reclassified from accumulated other comprehensive loss into net income, net of tax		(1,781)	(1,696)	(7,386)	(3,172)
Amount reclassified from accumulated other comprehensive loss related to amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale, net of tax		0	0	0	0
Total other comprehensive income (loss)		(5,014)	155	(24,915)	3,196
Balance		(17,058)	11,903	(17,058)	11,903
Accumulated Foreign Currency Translation Adjustments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance	(33,186)	(37,594)	(38,079)	(42,376)	(33,186)
Cumulative effect adjustment from the adoption of ASU 2018-02	0
Other comprehensive income (loss) during the period, net of tax, before reclassifications		(1,471)	1,942	3,311	(2,951)
Amount reclassified from accumulated other comprehensive loss into net income, net of tax		0	0	0	0
Amount reclassified from accumulated other comprehensive loss related to amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale, net of tax		0	0	0	0
Total other comprehensive income (loss)		(1,471)	1,942	3,311	(2,951)
Balance		(39,065)	(36,137)	(39,065)	(36,137)
Accumulated other comprehensive loss
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance	(41,835)	(45,429)	(81,216)	(76,872)	(41,835)
Cumulative effect adjustment from the adoption of ASU 2018-02	(2,974)
Total other comprehensive income (loss)		6,552	(11,934)	37,995	(46,461)
Balance		$ (38,877)	$ (93,150)	$ (38,877)	$ (93,150)
ASU 2016-01
Activity Accumulated Other Comprehensive Income [Roll Forward]
Cumulative effect adjustment from the adoption of new accounting pronouncement	(1,880)
ASU 2016-01 | Accumulated Unrealized Losses on Securities
Activity Accumulated Other Comprehensive Income [Roll Forward]
Cumulative effect adjustment from the adoption of new accounting pronouncement	(1,880)
ASU 2016-01 | Accumulated Unrealized Gains on Derivative Instruments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Cumulative effect adjustment from the adoption of new accounting pronouncement	0
ASU 2016-01 | Accumulated Foreign Currency Translation Adjustments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Cumulative effect adjustment from the adoption of new accounting pronouncement	0
ASU 2016-01 | Accumulated other comprehensive loss
Activity Accumulated Other Comprehensive Income [Roll Forward]
Cumulative effect adjustment from the adoption of new accounting pronouncement	$ (1,880)

Shareholders' Equity And Earn_4

Shareholders' Equity And Earnings Per Share (Other Comprehensive Income Reclassified from AOCI) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income before taxes	$ 134,601	$ 122,814	$ 363,419	$ 352,471
Income tax expense	(35,480)	(30,866)	(93,686)	(88,962)
Interest on deposits	76,168	48,736	204,168	110,578
Interest on other borrowings	3,466	2,003	10,624	5,400
Interest on junior subordinated debentures	2,897	2,940	9,111	8,239
Net income	99,121	91,948	269,733	263,509
Reclassification Out of Accumulated Other Comprehensive Income | Accumulated Unrealized Losses on Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Gains (losses) on investment securities, net	400	1,001	856	6
Income before taxes	400	1,001	856	6
Income tax expense	(108)	(271)	(230)	(1)
Net income	292	730	626	5
Reclassification Out of Accumulated Other Comprehensive Income | Accumulated Unrealized Gains on Derivative Instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income before taxes	2,428	2,319	10,071	4,338
Income tax expense	(647)	(623)	(2,685)	(1,166)
Interest on deposits	(2,635)	(2,319)	(10,403)	(4,338)
Interest on other borrowings	196	0	321	0
Interest on junior subordinated debentures	11	0	11	0
Net income	$ 1,781	$ 1,696	$ 7,386	$ 3,172

Shareholders' Equity And Earn_5

Shareholders' Equity And Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Net income	$ 99,121	$ 91,948	$ 269,733	$ 263,509
Less: Preferred stock dividends	2,050	2,050	6,150	6,150
Net income applicable to common shares	$ 97,071	$ 89,898	$ 263,583	$ 257,359
Weighted average common shares outstanding (in shares)	56,690	56,366	56,627	56,268
Effect of dilutive potential common shares
Common stock equivalents (in shares)	773	918	724	912
Average common shares and dilutive common shares (in shares)	57,463	57,284	57,351	57,180
Net income per common share:
Basic (usd per share)	$ 1.71	$ 1.59	$ 4.65	$ 4.57
Diluted (usd per share)	$ 1.69	$ 1.57	$ 4.60	$ 4.50

Shareholders' Equity And Earn_6

Shareholders' Equity And Earnings Per Share (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands	Jul. 31, 2019	Dec. 19, 2008	Apr. 30, 2019	Jan. 31, 2019	Jun. 30, 2015	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Temporary Equity [Line Items]
Cash dividends declared per common share (usd per share)	$ 0.25		$ 0.25	$ 0.25		$ 0.25	$ 0.19	$ 0.75	$ 0.57
Common stock dividends per share declared annualized (usd per share)	$ 1		$ 1	$ 1
US Treasury
Temporary Equity [Line Items]
Warrants outstanding, shares		1,643,295
Warrant termination period		10 years
Warrants exercised, shares										22,952
Common stock shares issued from exercise of warrants										16,571
Series D Preferred Stock
Temporary Equity [Line Items]
Preferred stock, shares issued (in shares)					5,000,000	5,000,000	5,000,000	5,000,000	5,000,000	5,000,000
Preferred stock, liquidation value per share (usd per share)					$ 25	$ 25	$ 25	$ 25	$ 25	$ 25
Preferred stock, value					$ 125,000	$ 125,000	$ 125,000	$ 125,000	$ 125,000	$ 125,000
Preferred stock, dividend rate, percentage					6.50%
London Interbank Offered Rate (LIBOR) | Series D Preferred Stock
Temporary Equity [Line Items]
Preferred stock, dividend rate, percentage, variable spread					4.06%

Subsequent Events (Details)

Subsequent Events (Details) $ in Thousands	Nov. 01, 2019locations	Oct. 31, 2019USD ($)	Oct. 07, 2019locations	Sep. 30, 2019USD ($)	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)
Subsequent Event [Line Items]
Assets				$ 34,911,902	$ 31,244,849	$ 30,142,731
Loans				25,710,171	23,820,691	23,123,951
Deposits				28,710,379	$ 26,094,678	$ 24,916,715
STC Capital Bank
Subsequent Event [Line Items]
Assets				240,000
Loans				181,000
Deposits				$ 208,000
Subsequent Event | Countryside Bank
Subsequent Event [Line Items]
Assets		$ 578,000
Loans		434,000
Deposits		$ 501,000
Subsequent Event | STC
Subsequent Event [Line Items]
Number of banking offices acquired | locations			5
Subsequent Event | SBC
Subsequent Event [Line Items]
Number of banking offices acquired | locations	6