Wintrust Financial (WTFC) 10-Q 9 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 30, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	WINTRUST FINANCIAL CORP
Trading Symbol	WTFC
Entity Central Index Key	0001015328
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		56,663,096

Consolidated Statements Of Cond

Consolidated Statements Of Condition - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Assets
Cash and due from banks	$ 270,765	$ 392,142	$ 231,407
Federal funds sold and securities purchased under resale agreements	58	58	57
Interest bearing deposits with banks	1,609,852	1,099,594	980,380
Available-for-sale securities, at fair value	2,185,782	2,126,081	1,895,688
Held-to-maturity securities, at amortized cost ($1.0 billion, $1.0 billion and $862.5 million fair value at March 31, 2019, December 31, 2018, and March 31, 2018 respectively)	1,051,542	1,067,439	892,937
Trading account securities	559	1,692	1,682
Equity securities with readily determinable fair value	47,653	34,717	37,832
Federal Home Loan Bank and Federal Reserve Bank stock	89,013	91,354	104,956
Brokerage customer receivables	14,219	12,609	24,531
Mortgage loans held-for-sale, at fair value	248,557	264,070	411,505
Loans, net of unearned income	24,214,629	23,820,691	22,062,134
Allowance for loan losses	(158,212)	(152,770)	(139,503)
Net loans	24,056,417	23,667,921	21,922,631
Premises and equipment, net	676,037	671,169	626,687
Lease investments, net	224,240	233,208	190,775
Accrued interest receivable and other assets	888,492	696,707	601,794
Trade date securities receivable	375,211	263,523	0
Goodwill	573,658	573,141	511,497
Other intangible assets	46,566	49,424	22,413
Total assets	32,358,621	31,244,849	28,456,772
Deposits:
Non-interest bearing	6,353,456	6,569,880	6,612,319
Interest bearing	20,451,286	19,524,798	16,667,008
Total deposits	26,804,742	26,094,678	23,279,327
Federal Home Loan Bank advances	576,353	426,326	915,000
Other borrowings	372,194	393,855	247,092
Subordinated notes	139,235	139,210	139,111
Junior subordinated debentures	253,566	253,566	253,566
Accrued interest payable and other liabilities	840,559	669,644	591,426
Total liabilities	28,986,649	27,977,279	25,425,522
Shareholders’ Equity:
Common stock, no par value; $1.00 stated value; 100,000,000 shares authorized at March 31, 2019, December 31, 2018 and March 31, 2018; 56,765,450 shares issued at March 31, 2019, 56,518,119 shares issued at December 31, 2018 and 56,363,786 shares issued at March 31, 2018	56,765	56,518	56,364
Surplus	1,565,185	1,557,984	1,540,673
Treasury stock, at cost, 126,482 shares at March 31, 2019, 110,561 shares at December 31, 2018, and 107,288 shares at March 31, 2018	(6,650)	(5,634)	(5,355)
Retained earnings	1,682,016	1,610,574	1,387,663
Accumulated other comprehensive loss	(50,344)	(76,872)	(73,095)
Total shareholders’ equity	3,371,972	3,267,570	3,031,250
Total liabilities and shareholders’ equity	32,358,621	31,244,849	28,456,772
Preferred stock, no par value; 20,000,000 shares authorized at March 31, 2019, December 31, 2018 and March 31, 2018; Series D - $25 liquidation value; 5,000,000 shares issued and outstanding at March 31, 2019, December 31, 2018 and March 31, 2018
Shareholders’ Equity:
Preferred stock, no par value; 20,000,000 shares authorized at March 31, 2019, December 31, 2018 and March 31, 2018; Series D - $25 liquidation value; 5,000,000 shares issued and outstanding at March 31, 2019, December 31, 2018 and March 31, 2018	$ 125,000	$ 125,000	$ 125,000

Consolidated Statements Of Co_2

Consolidated Statements Of Condition (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Held-to-maturity securities, at Fair value	$ 1,041,695	$ 1,036,096	$ 862,527
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)	56,765,450	56,518,119	56,363,786
Treasury stock, (in shares)	126,482	110,561	107,288
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
	Mar. 31, 2019	Mar. 31, 2018
Interest income
Interest and fees on loans	$ 296,987	$ 234,994
Mortgage loans held-for-sale	2,209	2,818
Interest bearing deposits with banks	5,300	2,796
Investment securities	27,956	19,128
Trading account securities	8	14
Federal Home Loan Bank and Federal Reserve Bank stock	1,355	1,298
Brokerage customer receivables	155	157
Total interest income	333,970	261,205
Interest expense
Interest on deposits	60,976	26,549
Interest on Federal Home Loan Bank advances	2,450	3,639
Interest on other borrowings	3,633	1,699
Interest on subordinated notes	1,775	1,773
Interest on junior subordinated debentures	3,150	2,463
Total interest expense	71,984	36,123
Net interest income	261,986	225,082
Provision for credit losses	10,624	8,346
Net interest income after provision for credit losses	251,362	216,736
Non-interest income
Wealth management	23,977	22,986
Mortgage banking	18,158	30,960
Total revenue from contracts with customers	39,382	38,180
Gains (losses) on investment securities, net	1,364	(351)
Fees from covered call options	1,784	1,597
Trading (losses) gains, net	(171)	103
Operating lease income, net	10,796	9,691
Other	16,901	11,836
Total non-interest income	81,657	85,679
Non-interest expense
Salaries and employee benefits	125,723	112,436
Equipment	11,770	10,072
Operating lease equipment depreciation	8,319	6,533
Occupancy, net	16,245	13,767
Data processing	7,525	8,493
Advertising and marketing	9,858	8,824
Professional fees	5,556	6,649
Amortization of other intangible assets	2,942	1,004
FDIC insurance	3,576	4,362
OREO expense, net	632	2,926
Other	22,228	19,283
Total non-interest expense	214,374	194,349
Income before taxes	118,645	108,066
Income tax expense	29,499	26,085
Net income	89,146	81,981
Preferred stock dividends	2,050	2,050
Net income applicable to common shares	$ 87,096	$ 79,931
Net income per common share-Basic (usd per share)	$ 1.54	$ 1.42
Net income per common share-Diluted (usd per share)	1.52	1.40
Cash dividends declared per common share (usd per share)	$ 0.25	$ 0.19
Weighted average common shares outstanding (in shares)	56,529	56,137
Dilutive potential common shares (in shares)	699	888
Average common shares and dilutive common shares (in shares)	57,228	57,025
Service charges on deposit accounts
Non-interest income
Total revenue from contracts with customers	$ 8,848	$ 8,857

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 89,146	$ 81,981
Unrealized gains (losses) on available-for-sale securities
Before tax	38,275	(36,184)
Tax effect	(10,319)	9,710
Net of tax	27,956	(26,474)
Reclassification of net losses on available-for-sale securities included in net income
Before tax	(67)	(975)
Tax effect	18	262
Net of tax	(49)	(713)
Reclassification of amortization of unrealized net gains (losses) on investment securities transferred to held-to-maturity from available-for-sale
Before tax	144	(4)
Tax effect	(41)	1
Net of tax	103	(3)
Net unrealized gains (losses) on available-for-sale securities	27,902	(25,758)
Unrealized (losses) gains on derivative instruments
Before tax	(4,996)	3,075
Tax effect	1,345	(826)
Net unrealized (losses) gains on derivative instruments	(3,651)	2,249
Foreign currency adjustment
Before tax	2,891	(3,853)
Tax effect	(614)	956
Net foreign currency adjustment	2,277	(2,897)
Total other comprehensive income (loss)	26,528	(26,406)
Comprehensive income	$ 115,674	$ 55,575

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	81,981					81,981
Other comprehensive loss, net of tax	(26,406)						(26,406)
Cash dividends declared on common stock	(10,663)					(10,663)
Dividends on preferred stock	(2,050)					(2,050)
Stock-based compensation	3,683			3,683
Common stock issued for:
Exercise of stock options and warrants	7,196		179	7,017
Restricted stock awards	(369)		90	(90)	(369)
Employee stock purchase plan	630		8	622
Director compensation plan	425		19	406
Balance at Mar. 31, 2018	3,031,250	125,000	56,364	1,540,673	(5,355)	1,387,663	(73,095)
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 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	89,146					89,146
Other comprehensive loss, net of tax	26,528						26,528
Cash dividends declared on common stock	(14,123)					(14,123)
Dividends on preferred stock	(2,050)					(2,050)
Stock-based compensation	3,318			3,318
Common stock issued for:
Exercise of stock options and warrants	2,368		79	2,864	(575)
Restricted stock awards	(441)		139	(139)	(441)
Employee stock purchase plan	683		11	672
Director compensation plan	504		18	486
Balance at Mar. 31, 2019	$ 3,371,972	$ 125,000	$ 56,765	$ 1,565,185	$ (6,650)	$ 1,682,016	$ (50,344)

Consolidated Statements Of Ch_2

Consolidated Statements Of Changes In Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	1 Months Ended	3 Months Ended
	Jan. 31, 2019	Mar. 31, 2019	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Dividends declared on common stock (usd per share)	$ 0.25	$ 0.25	$ 0.19

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities:
Net income	$ 89,146	$ 81,981
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	10,624	8,346
Depreciation, amortization and accretion, net	21,197	15,883
Stock-based compensation expense	3,318	3,683
Net amortization of premium on securities	1,367	1,071
Accretion of discount on loans	(5,162)	(4,927)
Mortgage servicing rights fair value change, net	10,741	(2,931)
Originations and purchases of mortgage loans held-for-sale	(678,464)	(778,852)
Proceeds from sales of mortgage loans held-for-sale	705,785	696,336
Bank owned life insurance (BOLI) income	(1,591)	(714)
Decrease (increase) in trading securities, net	1,133	(687)
Net (increase) decrease in brokerage customer receivables	(1,610)	1,900
Gains on mortgage loans sold	(18,388)	(18,917)
(Gains) losses on investment securities, net	(1,364)	351
(Gains) losses on sales of premises and equipment, net	(5)	25
Net losses on sales and fair value adjustments of other real estate owned	186	2,387
(Increase) decrease in accrued interest receivable and other assets, net	(29,914)	4,434
(Decrease) increase in accrued interest payable and other liabilities, net	(19,314)	12,857
Net Cash Provided by Operating Activities	87,685	22,226
Investing Activities:
Proceeds from maturities and calls of available-for-sale securities	168,575	47,463
Proceeds from maturities and calls of held-to-maturity securities	45,173	4,270
Proceeds from sales of available-for-sale securities	263,456	210,891
Proceeds from sales and capital distributions of equity securities without readily determinable fair value	220	0
Purchases of available-for-sale securities	(566,376)	(333,999)
Purchases of held-to-maturity securities	(31,643)	(70,988)
Purchases of equity securities with readily determinable fair value	(11,505)	0
Purchases of equity securities without readily determinable fair value	(623)	(1,801)
Redemption (purchases) of Federal Home Loan Bank and Federal Reserve Bank stock, net	2,341	(14,967)
Distributions from investments in partnerships, net	363	132
Net cash paid in business combinations	0	(18,708)
Proceeds from sales of other real estate owned	2,758	3,679
Net (increase) decrease in interest bearing deposits with banks	(510,517)	81,162
Net increase in loans	(380,214)	(394,433)
Purchases of premises and equipment, net	(13,608)	(11,580)
Net Cash Used for Investing Activities	(1,031,600)	(498,879)
Financing Activities:
Increase in deposit accounts	710,061	95,988
Decrease in subordinated notes and other borrowings, net	(24,463)	(15,631)
Increase in Federal Home Loan Bank advances, net	149,999	355,000
Issuance of common shares resulting from the exercise of stock options, employee stock purchase plan and conversion of common stock warrants	4,130	8,251
Common stock repurchases for tax withholdings related to stock-based compensation	(1,016)	(369)
Dividends paid	(16,173)	(12,713)
Net Cash Provided by Financing Activities	822,538	430,526
Net Decrease in Cash and Cash Equivalents	(121,377)	(46,127)
Cash and Cash Equivalents at Beginning of Period	392,200	277,591
Cash and Cash Equivalents at End of Period	$ 270,823	$ 231,464

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 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	3 Months Ended
	Mar. 31, 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. fiscal 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 March 31, 2019, the separate lease liability and right of use asset was $196.9 million and $165.8 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 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 (Dollars in thousands) March 31, Operating lease cost $ 6,095 Short-term lease cost 181 Variable lease cost 776 Sublease income (83 ) Total lease cost $ 6,969 Cash paid for amounts included in the measurement of operating lease liabilities $ 5,763 Weighted average remaining lease term - operating leases 13.8 years Weighted average discount rate - operating leases 3.96 % (Dollars in thousands) Payments Remaining in 2019 $ 19,657 2020 22,596 2021 20,860 2022 20,104 2023 18,084 2024 17,167 2025 and thereafter 146,202 Total minimum future amounts $ 264,670 Impact of measuring the lease liability on a discounted basis (67,817 ) Total lease liability $ 196,853 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 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 PCI loans 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. 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. Like ASU No. 2016-13, 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. 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. At this time, the Company is finalizing potential accounting policy elections and modeling methodologies for estimating expected credit losses using reasonable and supportable forecast information. Additionally, the Company is utilizing certain historical data and a previously selected platform to build, store, execute and determine the financial impact. Controls and processes are also being designed for the continued implementation process and after the effective date. 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	3 Months Ended
	Mar. 31, 2019
Business Combinations And Asset Acquisitions [Abstract]
Business Combinations and Asset Acquisitions	Business Combinations and Asset Acquisitions Bank Acquisitions 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 approximately $119.3 million in loans, and approximately $150.8 million in deposits. 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 approximately $152.7 million in loans, and approximately $213.1 million in deposits. Additionally, the Company recorded goodwill of $26.5 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 recoded goodwill of $37.6 million on the acquisition. Purchased Credit Impaired ("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	3 Months Ended
	Mar. 31, 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	3 Months Ended
	Mar. 31, 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: March 31, 2019 (Dollars in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available-for-sale securities U.S. Treasury $ 126,236 $ 579 $ (97 ) $ 126,718 U.S. Government agencies 129,258 1,431 (2 ) 130,687 Municipal 132,870 3,701 (218 ) 136,353 Corporate notes: Financial issuers 97,072 63 (4,802 ) 92,333 Other 1,000 — — 1,000 Mortgage-backed: (1) Mortgage-backed securities 1,677,903 6,041 (27,662 ) 1,656,282 Collateralized mortgage obligations 42,514 293 (398 ) 42,409 Total available-for-sale securities $ 2,206,853 $ 12,108 $ (33,179 ) $ 2,185,782 Held-to-maturity securities U.S. Government agencies $ 806,293 $ 1,945 $ (14,580 ) $ 793,658 Municipal 245,249 3,669 (881 ) 248,037 Total held-to-maturity securities $ 1,051,542 $ 5,614 $ (15,461 ) $ 1,041,695 Equity securities with readily determinable fair value $ 45,915 $ 2,708 $ (970 ) $ 47,653 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. March 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (Dollars in thousands) Available-for-sale securities U.S. Treasury $ 25,022 $ — $ (295 ) $ 24,727 U.S. Government agencies 149,899 — (563 ) 149,336 Municipal 120,396 2,218 (856 ) 121,758 Corporate notes: Financial issuers 100,294 16 (1,595 ) 98,715 Other 1,000 — (1 ) 999 Mortgage-backed: (1) Mortgage-backed securities 1,510,421 169 (64,077 ) 1,446,513 Collateralized mortgage obligations 55,836 7 (2,203 ) 53,640 Total available-for-sale securities $ 1,962,868 $ 2,410 $ (69,590 ) $ 1,895,688 Held-to-maturity securities U.S. Government agencies $ 639,442 $ — $ (25,891 ) $ 613,551 Municipal 253,495 939 (5,458 ) 248,976 Total held-to-maturity securities $ 892,937 $ 939 $ (31,349 ) $ 862,527 Equity securities with readily determinable fair value $ 34,230 $ 4,670 $ (1,068 ) $ 37,832 (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 March 31, 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 no upward or downward adjustments on such securities in the first 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 March 31, 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 $ — $ — $ 24,908 $ (97 ) $ 24,908 $ (97 ) U.S. Government agencies — — 208 (2 ) 208 (2 ) Municipal 6,448 (12 ) 15,087 (206 ) 21,535 (218 ) Corporate notes: Financial issuers 9,987 (11 ) 72,283 (4,791 ) 82,270 (4,802 ) Other — — — — — — Mortgage-backed: Mortgage-backed securities — — 1,315,030 (27,662 ) 1,315,030 (27,662 ) Collateralized mortgage obligations — — 13,708 (398 ) 13,708 (398 ) Total available-for-sale securities $ 16,435 $ (23 ) $ 1,441,224 $ (33,156 ) $ 1,457,659 $ (33,179 ) Held-to-maturity securities U.S. Government agencies $ — $ — $ 403,196 $ (14,580 ) $ 403,196 $ (14,580 ) Municipal 7,951 (111 ) 50,196 (770 ) 58,147 (881 ) Total held-to-maturity securities $ 7,951 $ (111 ) $ 453,392 $ (15,350 ) $ 461,343 $ (15,461 ) 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 March 31, 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 March 31, (Dollars in thousands) 2019 2018 Realized gains on investment securities $ 17 $ — Realized losses on investment securities (84 ) (975 ) Net realized losses on investment securities (67 ) $ (975 ) Unrealized gains on equity securities with readily determinable fair value 1,431 1,873 Unrealized losses on equity securities with readily determinable fair value — (843 ) Net unrealized gains on equity securities with readily determinable fair value 1,431 1,030 Upward adjustments of equity securities without readily determinable fair values — 131 Downward adjustments of equity securities without readily determinable fair values — — Impairment of equity securities without readily determinable fair values — (537 ) Adjustment and impairment, net, of equity securities without readily determinable fair values — (406 ) Other than temporary impairment charges — — Gains (losses) on investment securities, net $ 1,364 $ (351 ) Proceeds from sales of available-for-sale securities $ 263,456 $ 210,891 Proceeds from sales of equity securities with readily determinable fair value — — Proceeds from sales and capital distributions of equity securities without readily determinable fair value 220 — During the three months ended March 31, 2019 , the Company recorded no 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 March 31, 2019 , December 31, 2018 and March 31, 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: March 31, 2019 December 31, 2018 March 31, 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 $ 68,996 $ 69,060 $ 82,206 $ 82,153 $ 180,899 $ 180,333 Due in one to five years 171,058 172,673 168,855 169,307 90,073 89,953 Due in five to ten years 116,901 113,825 121,129 115,206 116,909 116,517 Due after ten years 129,481 131,533 128,339 129,580 8,730 8,732 Mortgage-backed 1,720,417 1,698,691 1,684,965 1,629,835 1,566,257 1,500,153 Total available-for-sale securities $ 2,206,853 $ 2,185,782 $ 2,185,494 $ 2,126,081 $ 1,962,868 $ 1,895,688 Held-to-maturity securities Due in one year or less $ 9,134 $ 9,112 $ 10,009 $ 9,979 $ 3,786 $ 3,775 Due in one to five years 27,477 27,539 29,436 28,995 34,495 33,994 Due in five to ten years 301,971 302,066 295,897 290,206 210,705 205,823 Due after ten years 712,960 702,978 732,097 706,916 643,951 618,935 Total held-to-maturity securities $ 1,051,542 $ 1,041,695 $ 1,067,439 $ 1,036,096 $ 892,937 $ 862,527 Securities having a fair value of $1.7 billion at March 31, 2019 as well as securities having a fair value of $1.7 billion and $1.5 billion at December 31, 2018 and March 31, 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 March 31, 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	3 Months Ended
	Mar. 31, 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: March 31, December 31, March 31, (Dollars in thousands) 2019 2018 2018 Balance: Commercial $ 7,994,191 $ 7,828,538 $ 7,060,871 Commercial real estate 6,973,505 6,933,252 6,633,520 Home equity 528,448 552,343 626,547 Residential real estate 1,053,524 1,002,464 869,104 Premium finance receivables—commercial 2,988,788 2,841,659 2,576,150 Premium finance receivables—life insurance 4,555,369 4,541,794 4,189,961 Consumer and other 120,804 120,641 105,981 Total loans, net of unearned income $ 24,214,629 $ 23,820,691 $ 22,062,134 Mix: Commercial 33 % 33 % 32 % Commercial real estate 29 29 30 Home equity 2 2 3 Residential real estate 4 4 4 Premium finance receivables—commercial 12 12 12 Premium finance receivables—life insurance 19 19 19 Consumer and other 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 $110.0 million at March 31, 2019 , $112.9 million at December 31, 2018 and $85.4 million at March 31, 2018 . Total loans, excluding PCI loans, include net deferred loan fees and costs and fair value purchase accounting adjustments totaling $6.4 million at March 31, 2019 , $4.5 million at December 31, 2018 and $9.4 million at March 31, 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: March 31, 2019 December 31, 2018 (Dollars in thousands) Unpaid Principal Balance Carrying Value Unpaid Carrying PCI loans $ 334,654 $ 313,221 $ 341,555 $ 318,394 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 March 31, 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 (Dollars in thousands) March 31, March 31, Accretable yield, beginning balance $ 34,876 $ 36,565 Acquisitions — — Accretable yield amortized to interest income (3,829 ) (4,619 ) Reclassification from non-accretable difference (1) 1,574 1,556 Increases in interest cash flows due to payments and changes in interest rates 1,471 2,190 Accretable yield, ending balance $ 34,092 $ 35,692 (1) Reclassification is the result of subsequent increases in expected principal cash flows. Accretion to interest income accounted for under ASC 310-30 totaled $3.8 million and $4.6 million in the first quarter of 2019 and 2018 , respectively. These amounts are included within interest and fees on loans in the Consolidated Statements of Income.

Allowance for Loan Losses, Allo

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans	3 Months Ended
	Mar. 31, 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 March 31, 2019 , December 31, 2018 and March 31, 2018 : As of March 31, 2019 90+ days and still accruing 60-89 days past due 30-59 days past due (Dollars in thousands) Nonaccrual Current Total Loans Loan Balances: Commercial Commercial, industrial and other $ 38,858 $ — $ 1,787 $ 38,094 $ 5,172,214 $ 5,250,953 Franchise 15,799 — — 534 863,573 879,906 Mortgage warehouse lines of credit — — — — 174,284 174,284 Asset-based lending 1,135 — — 7,821 1,031,878 1,040,834 Leases — — — 2,796 620,088 622,884 PCI - commercial (1) — 2,499 — 455 22,376 25,330 Total commercial 55,792 2,499 1,787 49,700 7,884,413 7,994,191 Commercial real estate: Construction 1,030 — 496 3,877 798,266 803,669 Land 54 — — 3,888 143,759 147,701 Office 4,482 — — 3,364 918,529 926,375 Industrial 267 — 1,039 10,643 953,011 964,960 Retail 7,645 — — 8,149 879,473 895,267 Multi-family 303 — 187 675 1,116,220 1,117,385 Mixed use and other 2,152 — 1,084 17,243 1,987,008 2,007,487 PCI - commercial real estate (1) — 4,265 2,806 7,033 96,557 110,661 Total commercial real estate 15,933 4,265 5,612 54,872 6,892,823 6,973,505 Home equity 7,885 — 810 4,315 515,438 528,448 Residential real estate, including PCI 15,879 1,481 509 11,112 1,024,543 1,053,524 Premium finance receivables Commercial insurance loans 14,797 6,558 5,628 20,767 2,941,038 2,988,788 Life insurance loans — 168 4,788 35,046 4,349,597 4,389,599 PCI - life insurance loans (1) — — — — 165,770 165,770 Consumer and other, including PCI 326 280 47 350 119,801 120,804 Total loans, net of unearned income $ 110,612 $ 15,251 $ 19,181 $ 176,162 $ 23,893,423 $ 24,214,629 As of December 31, 2018 90+ days and still accruing 60-89 days past due 30-59 days past due (Dollars 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 March 31, 2018 90+ days and still accruing 60-89 days past due 30-59 days past due (Dollars in thousands) Nonaccrual Current Total Loans Loan Balances: Commercial Commercial, industrial and other $ 10,051 $ — $ 594 $ 31,475 $ 4,518,760 $ 4,560,880 Franchise 2,401 — 44 1,203 931,710 935,358 Mortgage warehouse lines of credit — — — 5,771 157,699 163,470 Asset-based lending 1,194 — 47 12,611 963,883 977,735 Leases 361 — — 3,170 410,667 414,198 PCI - commercial (1) — 856 86 3 8,285 9,230 Total commercial 14,007 856 771 54,233 6,991,004 7,060,871 Commercial real estate: Construction 3,139 — — 9,576 802,921 815,636 Land 182 — — 4,527 117,981 122,690 Office 474 — 925 11,466 878,206 891,071 Industrial 1,427 — 823 5,027 898,867 906,144 Retail 12,274 — — 4,785 878,563 895,622 Multi-family 19 — — 328 931,008 931,355 Mixed use and other 4,310 — 192 13,626 1,937,328 1,955,456 PCI - commercial real estate (1) — 3,107 1,623 9,134 101,682 115,546 Total commercial real estate 21,825 3,107 3,563 58,469 6,546,556 6,633,520 Home equity 9,828 — 1,505 4,033 611,181 626,547 Residential real estate, including PCI 17,214 1,437 229 8,808 841,416 869,104 Premium finance receivables Commercial insurance loans 17,342 8,547 6,543 17,756 2,525,962 2,576,150 Life insurance loans — — 5,125 11,420 3,986,181 4,002,726 PCI - life insurance loans (1) — — — — 187,235 187,235 Consumer and other, including PCI 720 269 216 291 104,485 105,981 Total loans, net of unearned income $ 80,936 $ 14,216 $ 17,952 $ 155,010 $ 21,794,020 $ 22,062,134 (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 March 31, 2019 , December 31, 2018 and March 31, 2018 : Performing Non-performing Total (Dollars in thousands) March 31, December 31, March 31, March 31, December 31, March 31, March 31, December 31, March 31, Loan Balances: Commercial Commercial, industrial and other $ 5,212,095 $ 5,085,798 $ 4,550,829 $ 38,858 $ 34,298 $ 10,051 $ 5,250,953 $ 5,120,096 $ 4,560,880 Franchise 864,107 932,928 932,957 15,799 16,051 2,401 879,906 948,979 935,358 Mortgage warehouse lines of credit 174,284 144,199 163,470 — — — 174,284 144,199 163,470 Asset-based lending 1,039,699 1,025,421 976,541 1,135 635 1,194 1,040,834 1,026,056 977,735 Leases 622,884 565,680 413,837 — — 361 622,884 565,680 414,198 PCI - commercial (1) 25,330 23,528 9,230 — — — 25,330 23,528 9,230 Total commercial 7,938,399 7,777,554 7,046,864 55,792 50,984 14,007 7,994,191 7,828,538 7,060,871 Commercial real estate Construction 802,639 759,270 812,497 1,030 1,554 3,139 803,669 760,824 815,636 Land 147,647 141,374 122,508 54 107 182 147,701 141,481 122,690 Office 921,893 935,693 890,597 4,482 3,629 474 926,375 939,322 891,071 Industrial 964,693 901,963 904,717 267 285 1,427 964,960 902,248 906,144 Retail 887,622 881,725 883,348 7,645 10,753 12,274 895,267 892,478 895,622 Multi-family 1,117,082 976,249 931,336 303 311 19 1,117,385 976,560 931,355 Mixed use and other 2,005,335 2,202,705 1,951,146 2,152 2,490 4,310 2,007,487 2,205,195 1,955,456 PCI - commercial real estate (1) 110,661 115,144 115,546 — — — 110,661 115,144 115,546 Total commercial real estate 6,957,572 6,914,123 6,611,695 15,933 19,129 21,825 6,973,505 6,933,252 6,633,520 Home equity 520,563 545,196 616,719 7,885 7,147 9,828 528,448 552,343 626,547 Residential real estate, including PCI 1,037,615 986,081 851,890 15,909 16,383 17,214 1,053,524 1,002,464 869,104 Premium finance receivables Commercial insurance loans 2,967,433 2,822,525 2,550,261 21,355 19,134 25,889 2,988,788 2,841,659 2,576,150 Life insurance loans 4,389,431 4,373,891 4,002,726 168 — — 4,389,599 4,373,891 4,002,726 PCI - life insurance loans (1) 165,770 167,903 187,235 — — — 165,770 167,903 187,235 Consumer and other, including PCI 120,260 120,184 105,054 544 457 927 120,804 120,641 105,981 Total loans, net of unearned income $ 24,097,043 $ 23,707,457 $ 21,972,444 $ 117,586 $ 113,234 $ 89,690 $ 24,214,629 $ 23,820,691 $ 22,062,134 (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 months ended March 31, 2019 and 2018 is as follows: Three months ended March 31, 2019 Commercial Real Estate Home Equity Residential Real Estate Premium Finance Receivables Consumer and Other Total Loans (Dollars 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 — (24 ) (7 ) (7 ) 11 — (27 ) Reclassification from allowance for unfunded lending-related commitments — (16 ) — — — — (16 ) Charge-offs (503 ) (3,734 ) (88 ) (3 ) (2,210 ) (102 ) (6,640 ) Recoveries 318 480 62 29 556 56 1,501 Provision for credit losses 6,997 877 153 417 2,147 33 10,624 Allowance for loan losses at period end $ 74,638 $ 57,850 $ 8,627 $ 7,630 $ 8,219 $ 1,248 $ 158,212 Allowance for unfunded lending-related commitments at period end $ — $ 1,410 $ — $ — $ — $ — $ 1,410 Allowance for credit losses at period end $ 74,638 $ 59,260 $ 8,627 $ 7,630 $ 8,219 $ 1,248 $ 159,622 Individually evaluated for impairment $ 11,858 $ 517 $ 796 $ 302 $ — $ 133 $ 13,606 Collectively evaluated for impairment 62,317 58,623 7,831 7,267 8,219 1,115 145,372 Loans acquired with deteriorated credit quality 463 120 — 61 — — 644 Loans at period end Individually evaluated for impairment $ 75,442 $ 30,300 $ 15,779 $ 22,464 $ — $ 376 $ 144,361 Collectively evaluated for impairment 7,893,419 6,832,544 512,669 921,204 7,378,387 117,753 23,655,976 Loans acquired with deteriorated credit quality 25,330 110,661 — 8,785 165,770 2,675 313,221 Loans held at fair value — — — 101,071 — — 101,071 Three months ended March 31, 2018 Commercial Commercial Real Estate Home Equity Residential Real Estate Premium Finance Receivables Consumer and Other Total Loans (Dollars in thousands) 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 (1 ) (24 ) — (3 ) (12 ) — (40 ) Reclassification from allowance for unfunded lending-related commitments — 26 — — — — 26 Charge-offs (2,687 ) (813 ) (357 ) (571 ) (4,721 ) (129 ) (9,278 ) Recoveries 262 1,687 123 40 385 47 2,544 Provision for credit losses 2,251 1,378 (399 ) 124 4,835 157 8,346 Allowance for loan losses at period end $ 57,636 $ 57,481 $ 9,860 $ 6,278 $ 7,333 $ 915 $ 139,503 Allowance for unfunded lending-related commitments at period end $ — $ 1,243 $ — $ — $ — $ — $ 1,243 Allowance for credit losses at period end $ 57,636 $ 58,724 $ 9,860 $ 6,278 $ 7,333 $ 915 $ 140,746 Individually evaluated for impairment $ 2,344 $ 3,611 $ 749 $ 148 $ — $ 25 $ 6,877 Collectively evaluated for impairment 54,789 55,042 9,111 6,029 7,333 890 133,194 Loans acquired with deteriorated credit quality 503 71 — 101 — — 675 Loans at period end Individually evaluated for impairment $ 33,810 $ 38,237 $ 10,102 $ 20,558 $ — $ 748 $ 103,455 Collectively evaluated for impairment 7,017,831 6,479,737 616,445 768,859 6,578,876 103,224 21,564,972 Loans acquired with deteriorated credit quality 9,230 115,546 — 11,725 187,235 2,009 325,745 Loans held at fair value — — — 67,962 — — 67,962 Impaired Loans A summary of impaired loans, including troubled debt restructurings ("TDRs"), is as follows: March 31, December 31, March 31, (Dollars in thousands) 2019 2018 2018 Impaired loans (included in non-performing and TDRs): Impaired loans with an allowance for loan loss required (1) $ 72,539 $ 60,219 $ 37,572 Impaired loans with no allowance for loan loss required 71,579 67,050 65,559 Total impaired loans (2) $ 144,118 $ 127,269 $ 103,131 Allowance for loan losses related to impaired loans $ 13,599 $ 11,437 $ 6,863 TDRs $ 88,362 $ 66,102 $ 47,676 (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 Three Months Ended As of March 31, 2019 March 31, 2019 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Dollars in thousands) Impaired loans with a related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 33,360 $ 33,623 $ 6,919 $ 33,641 $ 656 Franchise 15,776 16,256 4,702 15,855 243 Asset-based lending 331 331 237 335 7 Leases 1,691 1,691 — 1,701 21 Commercial real estate Construction — — — — — Land 45 45 9 45 1 Office 3,055 3,120 149 3,070 35 Industrial — — — — — Retail 5,114 5,114 41 5,116 51 Multi-family 1,185 1,185 30 1,185 12 Mixed use and other 1,082 1,118 281 1,085 13 Home equity 6,316 6,694 796 6,335 60 Residential real estate 4,390 4,664 302 4,403 42 Consumer and other 194 241 133 195 3 Impaired loans with no related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 17,411 $ 20,125 $ — $ 17,481 $ 316 Franchise 5,145 5,147 — 5,147 101 Asset-based lending 934 1,332 — 1,120 24 Leases 794 831 — 810 13 Commercial real estate Construction 2,146 2,671 — 2,496 33 Land 3,285 3,380 — 3,301 47 Office 1,991 2,006 — 1,993 29 Industrial 295 432 — 304 7 Retail 8,059 11,405 — 10,198 150 Multi-family 303 403 — 306 3 Mixed use and other 3,496 3,812 — 3,528 58 Home equity 9,463 12,658 — 9,560 155 Residential real estate 18,075 20,823 — 18,098 225 Consumer and other 182 276 — 184 3 Total impaired loans, net of unearned income $ 144,118 $ 159,383 $ 13,599 $ 147,492 $ 2,308 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 (Dollars 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 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 Three Months Ended As of March 31, 2018 March 31, 2018 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Dollars in thousands) Impaired loans with a related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 5,521 $ 5,587 $ 1,738 $ 5,607 $ 83 Franchise — — — — — Asset-based lending 1,107 1,107 475 1,166 20 Leases 2,213 2,221 131 2,247 27 Commercial real estate Construction 3,097 3,897 599 3,097 50 Land 1,500 1,500 3 1,567 17 Office 1,479 2,078 73 1,483 24 Industrial 63 172 1 63 2 Retail 15,347 15,415 2,512 15,315 166 Multi-family 1,234 1,277 21 1,254 12 Mixed use and other 2,036 2,281 388 2,054 30 Home equity 1,697 1,889 749 1,699 19 Residential real estate 2,253 2,956 148 2,258 33 Consumer and other 25 27 25 25 — Impaired loans with no related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 5,480 $ 6,777 $ — $ 5,650 $ 109 Franchise 18,657 18,661 — 18,675 239 Asset-based lending 86 231 — 182 3 Leases 746 746 — 754 11 Commercial real estate Construction 1,363 1,364 — 1,364 15 Land 2,329 2,434 — 2,339 31 Office 59 754 — 61 11 Industrial 1,427 1,485 — 1,430 20 Retail 2,695 2,992 — 2,710 58 Multi-family — 84 — — 1 Mixed use and other 5,284 5,981 — 5,340 80 Home equity 8,405 12,535 — 8,255 151 Residential real estate 18,305 20,983 — 18,630 222 Consumer and other 723 870 — 726 12 Total impaired loans, net of unearned income $ 103,131 $ 116,304 $ 6,863 $ 103,951 $ 1,446 TDRs At March 31, 2019 , the Company had $88.4 million in loans modified in TDRs. The $88.4 million in TDRs represents 163 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 March 31, 2019 and approximately $6.7 million of impairment was present and appropriately reserved for through the Company’s normal reserving methodology in the Company’s allowance for loan losses. For TDRs in which impairment is calculated by the present value of future cash flows, the Company records interest income representing the decrease in impairment resulting from the passage of time during the respective period, which differs from interest income from contractually required interest on these specific loans. During the three months ended March 31, 2019 and 2018 , the Company recorded $34,000 and $21,000 , respectively, of interest income, which was reflected as a decrease in impairment. 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 March 31, 2019 , the Company had $4.2 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 $14.2 million and $11.4 million at March 31, 2019 and 2018 , respectively. The tables below present a summary of the post-modification balance of loans restructured during the three months ended March 31, 2019 and 2018 , respectively, which represent TDRs: Three months ended March 31, 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 8 $ 18,854 1 $ 432 — $ — 7 $ 18,422 — $ — Asset-based lending 1 76 1 76 — — — — — — Commercial real estate Mixed use and other 1 302 — — — — 1 302 — — Residential real estate and other 20 4,486 20 4,486 6 1,547 — — — — Total loans 30 $ 23,718 22 $ 4,994 6 $ 1,547 8 $ 18,724 — $ — (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. Three months ended March 31, 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 $ 96 1 $ 96 — $ — — $ — — $ — Commercial real estate Office 1 59 1 59 — — — — — — Mixed use and other — — — — — — — — — — Residential real estate and other 5 835 5 835 2 111 — — — — Total loans 7 $ 990 7 $ 990 2 $ 111 — $ — — $ — (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 March 31, 2019 , 30 loans totaling $23.7 million were determined to be TDRs, compared to seven loans totaling $990,000 during the three months ended March 31, 2018 . Of these loans extended at below market terms, the weighted average extension had a term of approximately 12 months during the quarter ended March 31, 2019 compared to 74 months for the quarter ended March 31, 2018 . Further, the weighted average decrease in the stated interest rate for loans with a reduction of interest rate during the period was approximately 211 basis points and 287 basis points during the three months ended March 31, 2019 and 2018 , respectively. Interest-only payment terms were approximately three months during the three months ended March 31, 2019 . Additionally, no principal balances were forgiven in the first quarter of 2019 and 2018. The following table presents a summary of all loans restructured in TDRs during the twelve months ended March 31, 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 March 31, 2019 Three Months Ended March 31, 2019 As of March 31, 2018 Three Months Ended March 31, 2018 Total (1)(3) Payments in Default (2)(3) Total (1)(3) Payments in Default (2)(3) Count Balance Count Balance Count Balance Count Balance Commercial Commercial, industrial and other 11 $ 32,199 1 $ 77 5 $ 3,776 5 $ 3,776 Franchise 3 5,157 — — — — — — Asset-based lending 2 206 2 206 — — — — Leases 1 239 — — 3 16,256 — — Commercial real estate Office — — — — 1 59 — — Mixed use and other 3 757 3 757 — — — — Residential real estate and other 74 13,411 9 1,759 15 3,711 5 2,551 Total loans 94 $ 51,969 15 $ 2,799 24 $ 23,802 10 $ 6,327 (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.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 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 March 31, Community banking $ 465,085 $ — $ — $ 37 $ 465,122 Specialty finance 38,343 — — 480 38,823 Wealth management 69,713 — — — 69,713 Total $ 573,141 $ — $ — $ 517 $ 573,658 The community banking segment's goodwill increased $37,000 in the first quarter of 2019 primarily as a result of a purchase accounting adjustment related to the acquisition of Delaware Place Bank. The specialty finance segment's goodwill increased $480,000 in the first quarter of 2019 as a result of foreign currency translation adjustments related to the Canadian acquisitions. At June 30, 2018, 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 March 31, 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 March 31, 2019 is as follows: (Dollars in thousands) March 31, December 31, March 31, Community banking segment: Core deposit intangibles with finite lives: Gross carrying amount $ 55,447 $ 55,366 $ 37,272 Accumulated amortization (31,022 ) (29,406 ) (26,280 ) Net carrying amount $ 24,425 $ 25,960 $ 10,992 Trademark with indefinite lives: Carrying amount 5,800 5,800 5,800 Total net carrying amount $ 30,225 $ 31,760 $ 16,792 Specialty finance segment: Customer list intangibles with finite lives: Gross carrying amount $ 1,961 $ 1,958 $ 1,967 Accumulated amortization (1,468 ) (1,436 ) (1,335 ) Net carrying amount $ 493 $ 522 $ 632 Wealth management segment: Customer list and other intangibles with finite lives: Gross carrying amount $ 20,430 $ 20,430 $ 7,940 Accumulated amortization (4,582 ) (3,288 ) (2,951 ) Net carrying amount $ 15,848 $ 17,142 $ 4,989 Total intangible assets: Gross carrying amount $ 83,638 $ 83,554 $ 52,979 Accumulated amortization (37,072 ) (34,130 ) (30,566 ) Total intangible assets, net $ 46,566 $ 49,424 $ 22,413 Estimated amortization Actual in three months ended March 31, 2019 $ 2,942 Estimated remaining in 2019 8,414 Estimated—2020 9,595 Estimated—2021 6,385 Estimated—2022 4,957 Estimated—2023 3,630 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 $2.9 million and $1.0 million for the three months ended March 31, 2019 and 2018 , respectively.

Mortgage Servicing Rights ("MSR

Mortgage Servicing Rights ("MSRs")	3 Months Ended
	Mar. 31, 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 March 31, March 31, (Dollars in thousands) 2019 2018 Balance at beginning of the period $ 75,183 $ 33,676 Additions from loans sold with servicing retained 6,580 4,159 Additions from acquisitions — 13,806 Estimate of changes in fair value due to: Payoffs and paydowns (1,997 ) (1,202 ) Changes in valuation inputs or assumptions (8,744 ) 4,133 Fair value at end of the period $ 71,022 $ 54,572 Unpaid principal balance of mortgage loans serviced for others $ 7,014,269 $ 4,795,335 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. The Company did not specifically hedge the value of its MSRs during the first quarter of 2019 and 2018. 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.

Deposits

Deposits	3 Months Ended
	Mar. 31, 2019
Deposits [Abstract]
Deposits	Deposits The following table is a summary of deposits as of the dates shown: (Dollars in thousands) March 31, December 31, March 31, Balance: Non-interest bearing $ 6,353,456 $ 6,569,880 $ 6,612,319 NOW and interest bearing demand deposits 2,948,576 2,897,133 2,315,122 Wealth management deposits 3,328,781 2,996,764 2,495,134 Money market 6,093,596 5,704,866 4,617,122 Savings 2,729,626 2,665,194 2,901,504 Time certificates of deposit 5,350,707 5,260,841 4,338,126 Total deposits $ 26,804,742 $ 26,094,678 $ 23,279,327 Mix: Non-interest bearing 24 % 25 % 28 % NOW and interest bearing demand deposits 11 11 10 Wealth management deposits 12 12 11 Money market 23 22 20 Savings 10 10 12 Time certificates of deposit 20 20 19 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	3 Months Ended
	Mar. 31, 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: (Dollars in thousands) March 31, December 31, March 31, FHLB advances $ 576,353 $ 426,326 $ 915,000 Other borrowings: Notes payable 139,119 144,461 33,727 Short-term borrowings 16,212 50,593 17,977 Other 47,394 47,722 48,742 Secured borrowings 169,469 151,079 146,646 Total other borrowings 372,194 393,855 247,092 Subordinated notes 139,235 139,210 139,111 Total FHLB advances, other borrowings and subordinated notes $ 1,087,782 $ 959,391 $ 1,301,203 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 March 31, 2019, the Company had a notes payable balance of $139.1 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. At March 31, 2019, the Company had no outstanding balance under the Revolving Credit Facility. As no outstanding balance exists on the Revolving Credit Facility, unamortized costs paid by the Company in relation to the issuance of this debt 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 March 31, 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. The Company had a balance under this loan agreement of $33.7 million at March 31, 2018. Short-term Borrowings Short-term borrowings include securities sold under repurchase agreements and federal funds purchased. These borrowings totaled $16.2 million at March 31, 2019 compared to $50.6 million at December 31, 2018 and $18.0 million at March 31, 2018 . At March 31, 2019 , December 31, 2018 and March 31, 2018 , securities sold under repurchase agreements represent $16.2 million , $50.6 million and $18.0 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 March 31, 2019 , the Company had pledged securities related to its customer balances in sweep accounts of $53.3 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 March 31, 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: (Dollars in thousands) Overnight Sweep Collateral Available-for-sale securities pledged U.S. Government agencies $ — Mortgage-backed securities 38,942 Held-to-maturity securities pledged U.S. Government agencies 14,400 Total collateral pledged $ 53,342 Excess collateral 37,130 Securities sold under repurchase agreements $ 16,212 Other Borrowings Other borrowings at March 31, 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 March 31, 2019 , the Fixed-Rate Promissory Note had a balance of $47.4 million compared to $47.7 million at December 31, 2018 and $48.7 million at March 31, 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 March 31, 2019 , the Company was in compliance with all such covenants. Secured Borrowings Secured borrowings at March 31, 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 . In February 2019, the unrelated third party paid an additional C$20 million , which increased the total payments to C$210 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 March 31, 2019 , the translated balance of the secured borrowing totaled $157.2 million compared to $139.3 million at December 31, 2018 and $131.7 million at March 31, 2018 . Additionally, the interest rate under the Receivables Purchase Agreement at March 31, 2019 was 2.9398% . The remaining $12.3 million within secured borrowings at March 31, 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 March 31, 2019 , the Company had outstanding subordinated notes totaling $139.2 million compared to $139.2 million and $139.1 million outstanding at December 31, 2018 and March 31, 2018 , respectively. The notes have a stated interest rate of 5.00% and mature in June 2024 . These notes are stated at par adjusted for unamortized costs paid related to the issuance of this debt.

Junior Subordinated Debentures

Junior Subordinated Debentures	3 Months Ended
	Mar. 31, 2019
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [Abstract]
Junior Subordinated Debentures	Junior Subordinated Debentures As of March 31, 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 March 31, 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 3/31/2019 Issue Date Maturity Date Earliest Redemption Date Wintrust Capital Trust III $ 774 $ 25,000 $ 25,774 L+3.25 6.04 % 04/2003 04/2033 04/2008 Wintrust Statutory Trust IV 619 20,000 20,619 L+2.80 5.39 % 12/2003 12/2033 12/2008 Wintrust Statutory Trust V 1,238 40,000 41,238 L+2.60 5.19 % 05/2004 05/2034 06/2009 Wintrust Capital Trust VII 1,550 50,000 51,550 L+1.95 4.56 % 12/2004 03/2035 03/2010 Wintrust Capital Trust VIII 1,238 25,000 26,238 L+1.45 4.04 % 08/2005 09/2035 09/2010 Wintrust Capital Trust IX 1,547 50,000 51,547 L+1.63 4.24 % 09/2006 09/2036 09/2011 Northview Capital Trust I 186 6,000 6,186 L+3.00 5.74 % 08/2003 11/2033 08/2008 Town Bankshares Capital Trust I 186 6,000 6,186 L+3.00 5.74 % 08/2003 11/2033 08/2008 First Northwest Capital Trust I 155 5,000 5,155 L+3.00 5.59 % 05/2004 05/2034 05/2009 Suburban Illinois Capital Trust II 464 15,000 15,464 L+1.75 4.36 % 12/2006 12/2036 12/2011 Community Financial Shares Statutory Trust II 109 3,500 3,609 L+1.62 4.23 % 06/2007 09/2037 06/2012 Total $ 253,566 4.82 % The junior subordinated debentures totaled $253.6 million at March 31, 2019 , December 31, 2018 and March 31, 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 March 31, 2019 , the weighted average contractual interest rate on the junior subordinated debentures was 4.82% . 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 March 31, 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	3 Months Ended
	Mar. 31, 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 Revenue from contracts with customers Location in income statement March 31, March 31, Brokerage and insurance product commissions Wealth management $ 4,516 $ 6,031 Trust Wealth management 5,327 3,417 Asset management Wealth management 14,134 13,538 Total wealth management 23,977 22,986 Mortgage broker fees Mortgage banking 182 279 Service charges on deposit accounts Service charges on deposit accounts 8,848 8,857 Administrative services Other non-interest income 1,030 1,061 Card related fees Other non-interest income 2,556 2,139 Other deposit related fees Other non-interest income 2,789 2,858 Total revenue from contracts with customers $ 39,382 $ 38,180 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 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) March 31, December 31, March 31, Contract assets $ — $ — $ — Contract liabilities $ 1,639 $ 1,727 $ 1,614 Mortgage broker fees receivable $ 34 $ 44 $ 20 Administrative services receivable 147 275 — Wealth management receivable 10,397 13,610 8,111 Card related fees receivable 385 — 320 Total receivables from contracts with customer $ 10,963 $ 13,929 $ 8,451 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 $92,000 for the three months ended March 31, 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 $ 671 Estimated—2020 369 Estimated—2021 303 Estimated—2022 153 Estimated—2023 143 Estimated—2024 — Total $ 1,639 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	3 Months Ended
	Mar. 31, 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) March 31, March 31, Net interest income: Community Banking $ 211,424 $ 183,254 $ 28,170 15 % Specialty Finance 37,706 32,912 4,794 15 Wealth Management 7,502 4,441 3,061 69 Total Operating Segments 256,632 220,607 36,025 16 Intersegment Eliminations 5,354 4,475 879 20 Consolidated net interest income $ 261,986 $ 225,082 $ 36,904 16 % Non-interest income: Community Banking $ 48,267 $ 56,547 $ (8,280 ) (15 )% Specialty Finance 19,606 15,725 3,881 25 Wealth Management 25,035 22,958 2,077 9 Total Operating Segments 92,908 95,230 (2,322 ) (2 ) Intersegment Eliminations (11,251 ) (9,551 ) (1,700 ) (18 ) Consolidated non-interest income $ 81,657 $ 85,679 $ (4,022 ) (5 )% Net revenue: Community Banking $ 259,691 $ 239,801 $ 19,890 8 % Specialty Finance 57,312 48,637 8,675 18 Wealth Management 32,537 27,399 5,138 19 Total Operating Segments 349,540 315,837 33,703 11 Intersegment Eliminations (5,897 ) (5,076 ) (821 ) (16 ) Consolidated net revenue $ 343,643 $ 310,761 $ 32,882 11 % Segment profit: Community Banking $ 60,326 $ 57,280 $ 3,046 5 % Specialty Finance 21,848 20,000 1,848 9 Wealth Management 6,972 4,701 2,271 48 Consolidated net income $ 89,146 $ 81,981 $ 7,165 9 % Segment assets: Community Banking $ 25,997,025 $ 23,213,499 $ 2,783,526 12 % Specialty Finance 5,234,210 4,568,906 665,304 15 Wealth Management 1,127,386 674,367 453,019 67 Consolidated total assets $ 32,358,621 $ 28,456,772 $ 3,901,849 14 %

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 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; and (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. 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 March 31, 2019 , December 31, 2018 and March 31, 2018 : Derivative Assets Derivative Liabilities (Dollars in thousands) March 31, December 31, March 31, March 31, December 31, March 31, Derivatives designated as hedging instruments under ASC 815: Interest rate derivatives designated as Cash Flow Hedges $ 3,353 $ 6,270 $ 15,012 $ 2,589 $ 1,656 $ 35 Interest rate derivatives designated as Fair Value Hedges 1,260 2,636 4,962 3,167 1,756 — Total derivatives designated as hedging instruments under ASC 815 $ 4,613 $ 8,906 $ 19,974 $ 5,756 $ 3,412 $ 35 Derivatives not designated as hedging instruments under ASC 815: Interest rate derivatives $ 63,704 $ 59,519 $ 52,996 $ 63,536 $ 59,159 $ 52,408 Interest rate lock commitments 4,387 3,405 5,449 — 2,694 1,207 Forward commitments to sell mortgage loans 2,416 — 3 4,180 1,486 1,464 Foreign exchange contracts 384 1,342 538 396 1,337 585 Total derivatives not designated as hedging instruments under ASC 815 $ 70,891 $ 64,266 $ 58,986 $ 68,112 $ 64,676 $ 55,664 Total Derivatives $ 75,504 $ 73,172 $ 78,960 $ 73,868 $ 68,088 $ 55,699 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 March 31, 2019 , the Company had three interest rate swap derivatives designated as cash flow hedges of variable rate deposits and one interest rate collar derivative designated as a cash flow hedge of variable rate debt. 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 each of these cash flow hedges as of March 31, 2019 : March 31, 2019 (Dollars in thousands) Notional Fair Value Maturity Date Amount Asset (Liability) Interest Rate Swaps: June 2019 $ 200,000 $ 429 July 2019 250,000 1,083 August 2019 275,000 1,841 Interest Rate Collars: September 2023 139,286 (2,589 ) Total Cash Flow Hedges $ 864,286 $ 764 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 (Dollars in thousands) March 31, March 31, Unrealized gain at beginning of period $ 10,742 $ 11,902 Amount reclassified from accumulated other comprehensive income to interest expense on deposits and other borrowings (3,562 ) (680 ) Amount of (loss) gain recognized in other comprehensive income (1,434 ) 3,755 Unrealized gain at end of period $ 5,746 $ 14,977 As of March 31, 2019 , the Company estimates that during the next twelve months $7.7 million will be reclassified from accumulated other comprehensive income or loss as a reduction 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 March 31, 2019 , the Company has sixteen interest rate swaps with an aggregate notional amount of $172.3 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 was effective starting after March 31, 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 March 31, 2019 : March 31, 2019 (Dollars 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 $ 165,746 $ 1,776 $ — Available-for-sale debt securities 1,461 57 — The following table presents the loss or gain recognized related to derivative instruments that are designated as fair value hedges for the respective period: (Dollars in thousands) Derivatives in Fair Value Hedging Relationships Location of (Loss)/Gain Recognized in Income on Derivative Three Months Ended March 31, 2019 Interest rate swaps Interest and fees on loans $ (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 March 31, 2019 , the Company had interest rate derivative transactions with an aggregate notional amount of approximately $6.4 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 April 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 March 31, 2019 , the Company had forward commitments to sell mortgage loans with an aggregate notional amount of approximately $651.9 million and interest rate lock commitments with an aggregate notional amount of approximately $403.2 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 March 31, 2019 , the Company held foreign currency derivatives with an aggregate notional amount of approximately $37.1 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 March 31, 2019 , December 31, 2018 or March 31, 2018 . Amounts included in the Consolidated Statements of Income related to derivative instruments not designated in hedge relationships were as follows: (Dollars in thousands) Three Months Ended Derivative Location in income statement March 31, March 31, Interest rate swaps and caps Trading (losses) gains, net $ (191 ) $ 153 Mortgage banking derivatives Mortgage banking revenue 50 1,418 Covered call options Fees from covered call options 1,784 1,597 Foreign exchange contracts Trading (losses) gains, net (12 ) (43 ) 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 March 31, 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 $36.5 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 (Dollars in thousands) March 31, December 31, March 31, March 31, December 31, March 31, Gross Amounts Recognized $ 68,317 $ 68,425 $ 72,970 $ 69,292 $ 62,571 $ 52,443 Less: Amounts offset in the Statements of Financial Condition — — — — — — Net amount presented in the Statements of Financial Condition $ 68,317 $ 68,425 $ 72,970 $ 69,292 $ 62,571 $ 52,443 Gross amounts not offset in the Statements of Financial Condition Offsetting Derivative Positions (18,878 ) (28,124 ) (9,627 ) (18,878 ) (28,124 ) (9,627 ) Collateral Posted — (23,810 ) (54,490 ) (45,540 ) (2,640 ) (340 ) Net Credit Exposure $ 49,439 $ 16,491 $ 8,853 $ 4,874 $ 31,807 $ 42,476

Fair Values of Assets and Liabi

Fair Values of Assets and Liabilities	3 Months Ended
	Mar. 31, 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 a security. 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 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 March 31, 2019 , the Company classified $103.8 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 $3.0 million of U.S. Government agencies as Level 3 at March 31, 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 first 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 March 31, 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. 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 March 31, 2019 , the Company classified $11.2 million of loans held-for-investment as Level 3. The weighted average discount rate used as an input to value these loans at March 31, 2019 was 3.94% 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 14.01% at March 31, 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 1.24% with credit loss discount ranging from 0% - 7% at March 31, 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 March 31, 2019 , the Company classified $71.0 million of MSRs as Level 3. The weighted average discount rate used as an input to value the pool of MSRs at March 31, 2019 was 9.96% with discount rates applied ranging from 7% - 17% . 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 March 31, 2019 ranged from 0% - 93% or a weighted average prepayment speed of 14.01% . Further, for current and delinquent loans, the Company assumed a weighted average cost of servicing of $77 and $407 , 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 validated by comparison with valuations provided by the respective counterparties. 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 March 31, 2019 , the Company classified $3.1 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 March 31, 2019 was 78.82% 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. The following tables present the balances of assets and liabilities measured at fair value on a recurring basis for the periods presented: March 31, 2019 (Dollars in thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 126,718 $ 126,718 $ — $ — U.S. Government agencies 130,687 — 127,694 2,993 Municipal 136,353 — 32,519 103,834 Corporate notes 93,333 — 93,333 — Mortgage-backed 1,698,691 — 1,698,691 — Trading account securities 559 — 559 — Equity securities with readily determinable fair value 47,653 39,587 8,066 — Mortgage loans held-for-sale 248,557 — 248,557 — Loans held-for-investment 101,071 — 89,822 11,249 MSRs 71,022 — — 71,022 Nonqualified deferred compensation assets 13,230 — 13,230 — Derivative assets 75,504 — 72,415 3,089 Total $ 2,743,378 $ 166,305 $ 2,384,886 $ 192,187 Derivative liabilities $ 73,868 $ — $ 73,868 $ — 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 $ — March 31, 2018 (Dollars in thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 24,727 $ — $ 24,727 $ — U.S. Government agencies 149,336 — 145,720 3,616 Municipal 121,758 — 37,166 84,592 Corporate notes 99,714 — 99,714 — Mortgage-backed 1,500,153 — 1,500,153 — Trading account securities 1,682 — 1,682 — Equity securities with readily determinable fair value 37,832 — 37,832 — Mortgage loans held-for-sale 411,505 — 411,505 — Loans held-for-investment 67,962 — 41,342 26,620 MSRs 54,572 — — 54,572 Nonqualified deferred compensation assets 11,724 — 11,724 — Derivative assets 78,960 — 74,355 4,605 Total $ 2,559,925 $ — $ 2,385,920 $ 174,005 Derivative liabilities $ 55,699 $ — $ 55,699 $ — The aggregate remaining contractual principal balance outstanding as of March 31, 2019 , December 31, 2018 and March 31, 2018 for mortgage loans held-for-sale measured at fair value under ASC 825 was $243.6 million , $253.7 million and $396.9 million , respectively, while the aggregate fair value of mortgage loans held-for-sale was $248.6 million , $264.1 million and $411.5 million , for the same respective periods, as shown in the above tables. There were $1.9 million of loans past due greater than 90 days and still accruing in the mortgage loans held-for-sale portfolio as of March 31, 2019 and December 31, 2018 and no loans as of March 31, 2018 . The changes in Level 3 assets measured at fair value on a recurring basis during the three months ended March 31, 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 January 1, 2019 $ 108,926 $ 3,150 $ 11,347 $ 75,183 $ 2,457 Total net gains (losses) included in: Net income (1) — — 167 (4,161 ) 632 Other comprehensive loss 1,537 1 — — — Purchases 969 — — — — Issuances — — — — — Sales — — — — — Settlements (7,598 ) (158 ) (465 ) — — Net transfers into/(out of) Level 3 — — 200 — — Balance at March 31, 2019 $ 103,834 $ 2,993 $ 11,249 $ 71,022 $ 3,089 (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, 2018 $ 77,181 $ 3,779 $ 33,717 $ 33,676 $ 2,157 Total net gains (losses) included in: Net income (1) — — (1,128 ) 7,090 2,448 Other comprehensive income (loss) (2,190 ) (163 ) — — — Purchases (2) 12,270 — — 13,806 — Issuances — — — — — Sales — — — — — Settlements (2,669 ) — (6,255 ) — — Net transfers into/(out of) Level 3 — — 286 — — Balance at March 31, 2018 $ 84,592 $ 3,616 $ 26,620 $ 54,572 $ 4,605 (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) Purchased as a part of the Veterans First business combination. 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 March 31, 2019 . March 31, 2019 Three Months Ended March 31, 2019 Fair Value Losses Recognized, net (Dollars in thousands) Total Level 1 Level 2 Level 3 Impaired loans—collateral based $ 101,331 $ — $ — $ 101,331 $ 4,378 Other real estate owned (1) 21,520 — — 21,520 574 Total $ 122,851 $ — $ — $ 122,851 $ 4,952 (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 March 31, 2019 , the Company had $144.1 million of impaired loans classified as Level 3. Of the $144.1 million of impaired loans, $101.3 million were measured at fair value based on the underlying collateral of the loan as shown in the table above. The remaining $42.8 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 March 31, 2019 , the Company had $21.5 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 March 31, 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 $ 103,834 Bond pricing Equivalent rating BBB-AA+ N/A Increase U.S. Government agencies 2,993 Bond pricing Equivalent rating AAA AAA Increase Loans held-for-investment 11,249 Discounted cash flows Discount rate 3%-4% 3.94% Decrease Credit discount 0%-7% 1.24% Decrease Constant prepayment rate (CPR) 14.01% 14.01% Decrease MSRs 71,022 Discounted cash flows Discount rate 7%-17% 9.96% Decrease Constant prepayment rate (CPR) 0%-93% 14.01% Decrease Cost of servicing $70-$200 $77 Decrease Cost of servicing - delinquent $200-$1,000 $407 Decrease Derivatives 3,089 Discounted cash flows Pull-through rate 0%-100% 78.82% Increase Measured at fair value on a non-recurring basis: Impaired loans—collateral based $ 101,331 Appraisal value Appraisal adjustment - cost of sale 10% 10.00% Decrease Other real estate owned 21,520 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 March 31, 2019 At December 31, 2018 At March 31, 2018 Carrying Fair Carrying Fair Carrying Fair (Dollars in thousands) Value Value Value Value Value Value Financial Assets: Cash and cash equivalents $ 270,823 $ 270,823 $ 392,200 $ 392,200 $ 231,464 $ 231,464 Interest bearing deposits with banks 1,609,852 1,609,852 1,099,594 1,099,594 980,380 980,380 Available-for-sale securities 2,185,782 2,185,782 2,126,081 2,126,081 1,895,688 1,895,688 Held-to-maturity securities 1,051,542 1,041,695 1,067,439 1,036,096 892,937 862,527 Trading account securities 559 559 1,692 1,692 1,682 1,682 Equity securities with readily determinable fair value 47,653 47,653 34,717 34,717 37,832 37,832 FHLB and FRB stock, at cost 89,013 89,013 91,354 91,354 104,956 104,956 Brokerage customer receivables 14,219 14,219 12,609 12,609 24,531 24,531 Mortgage loans held-for-sale, at fair value 248,557 248,557 264,070 264,070 411,505 411,505 Loans held-for-investment, at fair value 101,071 101,071 93,857 93,857 67,962 67,962 Loans held-for-investment, at amortized cost 24,113,558 24,123,328 23,726,834 23,780,739 21,994,172 22,234,795 Nonqualified deferred compensation assets 13,230 13,230 11,282 11,282 11,724 11,724 Derivative assets 75,504 75,504 73,172 73,172 78,960 78,960 Accrued interest receivable and other 275,464 275,464 260,281 260,281 236,131 236,131 Total financial assets $ 30,096,827 $ 30,096,750 $ 29,255,182 $ 29,277,744 $ 26,969,924 $ 27,180,137 Financial Liabilities Non-maturity deposits $ 21,454,035 $ 21,454,035 $ 20,833,837 $ 20,833,837 $ 18,941,201 $ 18,941,201 Deposits with stated maturities 5,350,707 5,377,388 5,260,841 5,283,063 4,338,126 4,344,584 FHLB advances 576,353 604,976 426,326 429,830 915,000 916,513 Other borrowings 372,194 372,194 393,855 393,855 247,092 247,092 Subordinated notes 139,235 144,019 139,210 138,345 139,111 140,889 Junior subordinated debentures 253,566 252,451 253,566 263,846 253,566 268,873 Derivative liabilities 73,868 73,868 68,088 68,088 55,699 55,699 Accrued interest payable 19,569 19,569 16,025 16,025 11,442 11,442 Total financial liabilities $ 28,239,527 $ 28,298,500 $ 27,391,748 $ 27,426,889 $ 24,901,237 $ 24,926,293 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 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	3 Months Ended
	Mar. 31, 2019
Share-based Compensation [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 March 31, 2019 , approximately 2.6 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 $3.3 million in the first quarter of 2019 and $3.7 million in the first quarter of 2018 . A summary of the Company's stock option activity for the three months ended March 31, 2019 and March 31, 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 $ 42.25 Granted — — Exercised (78,667 ) 37.41 Forfeited or canceled — — Outstanding at March 31, 2019 716,347 $ 42.79 2.9 $ 17,583 Exercisable at March 31, 2019 701,227 $ 42.75 2.9 $ 17,234 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 (169,387 ) 42.47 Forfeited or canceled (1,703 ) 40.87 Outstanding at March 31, 2018 913,666 $ 41.89 3.7 $ 40,351 Exercisable at March 31, 2018 712,535 $ 42.00 3.4 $ 31,391 (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 three months ended March 31, 2019 and March 31, 2018 , was $2.8 million and $7.5 million , respectively. Cash received from option exercises under the Plan for the three months ended March 31, 2019 and March 31, 2018 was $2.9 million and $7.2 million , respectively. A summary of the Plans' restricted share activity for the three months ended March 31, 2019 and March 31, 2018 is presented below: Three months ended March 31, 2019 Three months ended March 31, 2018 Restricted Shares Common Shares Weighted Average Grant-Date Fair Value Common Shares Weighted Average Grant-Date Fair Value Outstanding at January 1 143,263 $ 60.80 127,787 $ 53.33 Granted 9,673 71.66 20,700 86.42 Vested and issued (11,042 ) 75.00 (7,258 ) 53.47 Forfeited or canceled (215 ) 93.14 (982 ) 55.39 Outstanding at March 31 141,679 $ 60.38 140,247 $ 58.20 Vested, but not issuable at March 31 90,824 $ 52.02 89,924 $ 51.71 A summary of the Plans' performance-based stock award activity, based on the target level of the awards, for the three months ended March 31, 2019 and March 31, 2018 is presented below: Three months ended March 31, 2019 Three months ended March 31, 2018 Performance-based Stock Common Weighted Common Weighted Outstanding at January 1 396,855 $ 67.71 359,196 $ 54.37 Granted 173,856 71.57 127,419 88.20 Vested and issued (94,288 ) 41.00 (82,307 ) 44.39 Forfeited (2,747 ) 67.85 (6,580 ) 49.42 Outstanding at March 31 473,676 $ 74.44 397,728 $ 67.35 Vested, but deferred at March 31 33,451 $ 42.70 21,388 $ 43.32 The actual number of shares vested and issued in the first quarter 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	3 Months Ended
	Mar. 31, 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 . 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 January 1, 2019 $ (42,353 ) $ 7,857 $ (42,376 ) $ (76,872 ) Other comprehensive income (loss) during the period, net of tax, before reclassifications 27,956 (1,039 ) 2,277 29,194 Amount reclassified from accumulated other comprehensive loss into net income, net of tax 49 (2,612 ) — (2,563 ) 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 (103 ) — — (103 ) Net other comprehensive income (loss) during the period, net of tax $ 27,902 $ (3,651 ) $ 2,277 $ 26,528 Balance at March 31, 2019 $ (14,451 ) $ 4,206 $ (40,099 ) $ (50,344 ) Accumulated Accumulated Accumulated Total 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 (26,474 ) 2,746 (2,897 ) (26,625 ) Amount reclassified from accumulated other comprehensive loss into net income, net of tax 713 (497 ) — 216 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 3 — — 3 Net other comprehensive (loss) income during the period, net of tax $ (25,758 ) $ 2,249 $ (2,897 ) $ (26,406 ) Balance at March 31, 2018 $ (47,968 ) $ 10,956 $ (36,083 ) $ (73,095 ) Amount Reclassified from Accumulated Other Comprehensive Income for the Details Regarding the Component of Accumulated Other Comprehensive Income Three Months Ended Impacted Line on the Consolidated Statements of Income March 31, 2019 2018 Accumulated unrealized losses on securities Losses included in net income $ (67 ) $ (975 ) Gains (losses) on investment securities, net (67 ) (975 ) Income before taxes Tax effect $ 18 $ 262 Income tax expense Net of tax $ (49 ) $ (713 ) Net income Accumulated unrealized losses on derivative instruments Amount reclassified to interest expense on deposits $ (3,589 ) $ (680 ) Interest on deposits Amount reclassified to interest expense on other borrowings 27 — Interest on other borrowings 3,562 680 Income before taxes Tax effect $ (950 ) $ (183 ) Income tax expense Net of tax $ 2,612 $ 497 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 (In thousands, except per share data) March 31, March 31, Net income $ 89,146 $ 81,981 Less: Preferred stock dividends 2,050 2,050 Net income applicable to common shares (A) 87,096 79,931 Weighted average common shares outstanding (B) 56,529 56,137 Effect of dilutive potential common shares Common stock equivalents 699 888 Weighted average common shares and effect of dilutive potential common shares (C) 57,228 57,025 Net income per common share: Basic (A/B) $ 1.54 $ 1.42 Diluted (A/C) $ 1.52 $ 1.40 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.

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 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. fiscal 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 March 31, 2019, the separate lease liability and right of use asset was $196.9 million and $165.8 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 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 (Dollars in thousands) March 31, Operating lease cost $ 6,095 Short-term lease cost 181 Variable lease cost 776 Sublease income (83 ) Total lease cost $ 6,969 Cash paid for amounts included in the measurement of operating lease liabilities $ 5,763 Weighted average remaining lease term - operating leases 13.8 years Weighted average discount rate - operating leases 3.96 % (Dollars in thousands) Payments Remaining in 2019 $ 19,657 2020 22,596 2021 20,860 2022 20,104 2023 18,084 2024 17,167 2025 and thereafter 146,202 Total minimum future amounts $ 264,670 Impact of measuring the lease liability on a discounted basis (67,817 ) Total lease liability $ 196,853 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 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 PCI loans 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. 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. Like ASU No. 2016-13, 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. 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. At this time, the Company is finalizing potential accounting policy elections and modeling methodologies for estimating expected credit losses using reasonable and supportable forecast information. Additionally, the Company is utilizing certain historical data and a previously selected platform to build, store, execute and determine the financial impact. Controls and processes are also being designed for the continued implementation process and after the effective date. 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	Purchased Credit Impaired ("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	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 no upward or downward adjustments on such securities in the first 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 March 31, 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. During the three months ended March 31, 2019 , the Company recorded no 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.
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	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 March 31, 2019 and approximately $6.7 million of impairment was present and appropriately reserved for through the Company’s normal reserving methodology in the Company’s allowance for loan losses. For TDRs in which impairment is calculated by the present value of future cash flows, the Company records interest income representing the decrease in impairment resulting from the passage of time during the respective period, which differs from interest income from contractually required interest on these specific loans. During the three months ended March 31, 2019 and 2018 , the Company recorded $34,000 and $21,000 , respectively, of interest income, which was reflected as a decrease in impairment. 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.
Goodwill	At June 30, 2018, 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 March 31, 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. The Company did not specifically hedge the value of its MSRs during the first quarter of 2019 and 2018. 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	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. At March 31, 2019, the Company had no outstanding balance under the Revolving Credit Facility. As no outstanding balance exists on the Revolving Credit Facility, unamortized costs paid by the Company in relation to the issuance of this debt are classified in other assets on the Consolidated Statements of Condition. 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. 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 These notes are stated at par adjusted for unamortized costs paid related to the issuance of this debt.
Transfers and Servicing of Financial Assets, Transfers of Financial Assets	The remaining $12.3 million within secured borrowings at March 31, 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 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 $92,000 for the three months ended March 31, 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	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. 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. 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. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings. 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. 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. 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. 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.
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 a security. 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 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 March 31, 2019 , the Company classified $103.8 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 $3.0 million of U.S. Government agencies as Level 3 at March 31, 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 first 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 March 31, 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. 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 March 31, 2019 , the Company classified $11.2 million of loans held-for-investment as Level 3. The weighted average discount rate used as an input to value these loans at March 31, 2019 was 3.94% 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 14.01% at March 31, 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 1.24% with credit loss discount ranging from 0% - 7% at March 31, 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 March 31, 2019 , the Company classified $71.0 million of MSRs as Level 3. The weighted average discount rate used as an input to value the pool of MSRs at March 31, 2019 was 9.96% with discount rates applied ranging from 7% - 17% . 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 March 31, 2019 ranged from 0% - 93% or a weighted average prepayment speed of 14.01% . Further, for current and delinquent loans, the Company assumed a weighted average cost of servicing of $77 and $407 , 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 validated by comparison with valuations provided by the respective counterparties. 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 March 31, 2019 , the Company classified $3.1 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 March 31, 2019 was 78.82% 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.
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	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 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 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 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)	3 Months Ended
	Mar. 31, 2019
Accounting Changes and Error Corrections [Abstract]
Summary of Lease Costs	Three Months Ended (Dollars in thousands) March 31, Operating lease cost $ 6,095 Short-term lease cost 181 Variable lease cost 776 Sublease income (83 ) Total lease cost $ 6,969 Cash paid for amounts included in the measurement of operating lease liabilities $ 5,763 Weighted average remaining lease term - operating leases 13.8 years Weighted average discount rate - operating leases 3.96 %
Future Required Fixed Lease Payments	(Dollars in thousands) Payments Remaining in 2019 $ 19,657 2020 22,596 2021 20,860 2022 20,104 2023 18,084 2024 17,167 2025 and thereafter 146,202 Total minimum future amounts $ 264,670 Impact of measuring the lease liability on a discounted basis (67,817 ) Total lease liability $ 196,853

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 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: March 31, 2019 (Dollars in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available-for-sale securities U.S. Treasury $ 126,236 $ 579 $ (97 ) $ 126,718 U.S. Government agencies 129,258 1,431 (2 ) 130,687 Municipal 132,870 3,701 (218 ) 136,353 Corporate notes: Financial issuers 97,072 63 (4,802 ) 92,333 Other 1,000 — — 1,000 Mortgage-backed: (1) Mortgage-backed securities 1,677,903 6,041 (27,662 ) 1,656,282 Collateralized mortgage obligations 42,514 293 (398 ) 42,409 Total available-for-sale securities $ 2,206,853 $ 12,108 $ (33,179 ) $ 2,185,782 Held-to-maturity securities U.S. Government agencies $ 806,293 $ 1,945 $ (14,580 ) $ 793,658 Municipal 245,249 3,669 (881 ) 248,037 Total held-to-maturity securities $ 1,051,542 $ 5,614 $ (15,461 ) $ 1,041,695 Equity securities with readily determinable fair value $ 45,915 $ 2,708 $ (970 ) $ 47,653 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. March 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (Dollars in thousands) Available-for-sale securities U.S. Treasury $ 25,022 $ — $ (295 ) $ 24,727 U.S. Government agencies 149,899 — (563 ) 149,336 Municipal 120,396 2,218 (856 ) 121,758 Corporate notes: Financial issuers 100,294 16 (1,595 ) 98,715 Other 1,000 — (1 ) 999 Mortgage-backed: (1) Mortgage-backed securities 1,510,421 169 (64,077 ) 1,446,513 Collateralized mortgage obligations 55,836 7 (2,203 ) 53,640 Total available-for-sale securities $ 1,962,868 $ 2,410 $ (69,590 ) $ 1,895,688 Held-to-maturity securities U.S. Government agencies $ 639,442 $ — $ (25,891 ) $ 613,551 Municipal 253,495 939 (5,458 ) 248,976 Total held-to-maturity securities $ 892,937 $ 939 $ (31,349 ) $ 862,527 Equity securities with readily determinable fair value $ 34,230 $ 4,670 $ (1,068 ) $ 37,832 (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 March 31, 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 $ — $ — $ 24,908 $ (97 ) $ 24,908 $ (97 ) U.S. Government agencies — — 208 (2 ) 208 (2 ) Municipal 6,448 (12 ) 15,087 (206 ) 21,535 (218 ) Corporate notes: Financial issuers 9,987 (11 ) 72,283 (4,791 ) 82,270 (4,802 ) Other — — — — — — Mortgage-backed: Mortgage-backed securities — — 1,315,030 (27,662 ) 1,315,030 (27,662 ) Collateralized mortgage obligations — — 13,708 (398 ) 13,708 (398 ) Total available-for-sale securities $ 16,435 $ (23 ) $ 1,441,224 $ (33,156 ) $ 1,457,659 $ (33,179 ) Held-to-maturity securities U.S. Government agencies $ — $ — $ 403,196 $ (14,580 ) $ 403,196 $ (14,580 ) Municipal 7,951 (111 ) 50,196 (770 ) 58,147 (881 ) Total held-to-maturity securities $ 7,951 $ (111 ) $ 453,392 $ (15,350 ) $ 461,343 $ (15,461 )
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 March 31, (Dollars in thousands) 2019 2018 Realized gains on investment securities $ 17 $ — Realized losses on investment securities (84 ) (975 ) Net realized losses on investment securities (67 ) $ (975 ) Unrealized gains on equity securities with readily determinable fair value 1,431 1,873 Unrealized losses on equity securities with readily determinable fair value — (843 ) Net unrealized gains on equity securities with readily determinable fair value 1,431 1,030 Upward adjustments of equity securities without readily determinable fair values — 131 Downward adjustments of equity securities without readily determinable fair values — — Impairment of equity securities without readily determinable fair values — (537 ) Adjustment and impairment, net, of equity securities without readily determinable fair values — (406 ) Other than temporary impairment charges — — Gains (losses) on investment securities, net $ 1,364 $ (351 ) Proceeds from sales of available-for-sale securities $ 263,456 $ 210,891 Proceeds from sales of equity securities with readily determinable fair value — — Proceeds from sales and capital distributions of equity securities without readily determinable fair value 220 —
Investments Classified by Contractual Maturity Date	The amortized cost and fair value of available-for-sale and held-to-maturity investment securities as of March 31, 2019 , December 31, 2018 and March 31, 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: March 31, 2019 December 31, 2018 March 31, 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 $ 68,996 $ 69,060 $ 82,206 $ 82,153 $ 180,899 $ 180,333 Due in one to five years 171,058 172,673 168,855 169,307 90,073 89,953 Due in five to ten years 116,901 113,825 121,129 115,206 116,909 116,517 Due after ten years 129,481 131,533 128,339 129,580 8,730 8,732 Mortgage-backed 1,720,417 1,698,691 1,684,965 1,629,835 1,566,257 1,500,153 Total available-for-sale securities $ 2,206,853 $ 2,185,782 $ 2,185,494 $ 2,126,081 $ 1,962,868 $ 1,895,688 Held-to-maturity securities Due in one year or less $ 9,134 $ 9,112 $ 10,009 $ 9,979 $ 3,786 $ 3,775 Due in one to five years 27,477 27,539 29,436 28,995 34,495 33,994 Due in five to ten years 301,971 302,066 295,897 290,206 210,705 205,823 Due after ten years 712,960 702,978 732,097 706,916 643,951 618,935 Total held-to-maturity securities $ 1,051,542 $ 1,041,695 $ 1,067,439 $ 1,036,096 $ 892,937 $ 862,527

Loans (Tables)

Loans (Tables)	3 Months Ended
	Mar. 31, 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: March 31, December 31, March 31, (Dollars in thousands) 2019 2018 2018 Balance: Commercial $ 7,994,191 $ 7,828,538 $ 7,060,871 Commercial real estate 6,973,505 6,933,252 6,633,520 Home equity 528,448 552,343 626,547 Residential real estate 1,053,524 1,002,464 869,104 Premium finance receivables—commercial 2,988,788 2,841,659 2,576,150 Premium finance receivables—life insurance 4,555,369 4,541,794 4,189,961 Consumer and other 120,804 120,641 105,981 Total loans, net of unearned income $ 24,214,629 $ 23,820,691 $ 22,062,134 Mix: Commercial 33 % 33 % 32 % Commercial real estate 29 29 30 Home equity 2 2 3 Residential real estate 4 4 4 Premium finance receivables—commercial 12 12 12 Premium finance receivables—life insurance 19 19 19 Consumer and other 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: March 31, 2019 December 31, 2018 (Dollars in thousands) Unpaid Principal Balance Carrying Value Unpaid Carrying PCI loans $ 334,654 $ 313,221 $ 341,555 $ 318,394
Activity Related to Accretable Yield of PCI Loans	The following table provides activity for the accretable yield of PCI loans: Three Months Ended (Dollars in thousands) March 31, March 31, Accretable yield, beginning balance $ 34,876 $ 36,565 Acquisitions — — Accretable yield amortized to interest income (3,829 ) (4,619 ) Reclassification from non-accretable difference (1) 1,574 1,556 Increases in interest cash flows due to payments and changes in interest rates 1,471 2,190 Accretable yield, ending balance $ 34,092 $ 35,692 (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)	3 Months Ended
	Mar. 31, 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 March 31, 2019 , December 31, 2018 and March 31, 2018 : As of March 31, 2019 90+ days and still accruing 60-89 days past due 30-59 days past due (Dollars in thousands) Nonaccrual Current Total Loans Loan Balances: Commercial Commercial, industrial and other $ 38,858 $ — $ 1,787 $ 38,094 $ 5,172,214 $ 5,250,953 Franchise 15,799 — — 534 863,573 879,906 Mortgage warehouse lines of credit — — — — 174,284 174,284 Asset-based lending 1,135 — — 7,821 1,031,878 1,040,834 Leases — — — 2,796 620,088 622,884 PCI - commercial (1) — 2,499 — 455 22,376 25,330 Total commercial 55,792 2,499 1,787 49,700 7,884,413 7,994,191 Commercial real estate: Construction 1,030 — 496 3,877 798,266 803,669 Land 54 — — 3,888 143,759 147,701 Office 4,482 — — 3,364 918,529 926,375 Industrial 267 — 1,039 10,643 953,011 964,960 Retail 7,645 — — 8,149 879,473 895,267 Multi-family 303 — 187 675 1,116,220 1,117,385 Mixed use and other 2,152 — 1,084 17,243 1,987,008 2,007,487 PCI - commercial real estate (1) — 4,265 2,806 7,033 96,557 110,661 Total commercial real estate 15,933 4,265 5,612 54,872 6,892,823 6,973,505 Home equity 7,885 — 810 4,315 515,438 528,448 Residential real estate, including PCI 15,879 1,481 509 11,112 1,024,543 1,053,524 Premium finance receivables Commercial insurance loans 14,797 6,558 5,628 20,767 2,941,038 2,988,788 Life insurance loans — 168 4,788 35,046 4,349,597 4,389,599 PCI - life insurance loans (1) — — — — 165,770 165,770 Consumer and other, including PCI 326 280 47 350 119,801 120,804 Total loans, net of unearned income $ 110,612 $ 15,251 $ 19,181 $ 176,162 $ 23,893,423 $ 24,214,629 As of December 31, 2018 90+ days and still accruing 60-89 days past due 30-59 days past due (Dollars 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 March 31, 2018 90+ days and still accruing 60-89 days past due 30-59 days past due (Dollars in thousands) Nonaccrual Current Total Loans Loan Balances: Commercial Commercial, industrial and other $ 10,051 $ — $ 594 $ 31,475 $ 4,518,760 $ 4,560,880 Franchise 2,401 — 44 1,203 931,710 935,358 Mortgage warehouse lines of credit — — — 5,771 157,699 163,470 Asset-based lending 1,194 — 47 12,611 963,883 977,735 Leases 361 — — 3,170 410,667 414,198 PCI - commercial (1) — 856 86 3 8,285 9,230 Total commercial 14,007 856 771 54,233 6,991,004 7,060,871 Commercial real estate: Construction 3,139 — — 9,576 802,921 815,636 Land 182 — — 4,527 117,981 122,690 Office 474 — 925 11,466 878,206 891,071 Industrial 1,427 — 823 5,027 898,867 906,144 Retail 12,274 — — 4,785 878,563 895,622 Multi-family 19 — — 328 931,008 931,355 Mixed use and other 4,310 — 192 13,626 1,937,328 1,955,456 PCI - commercial real estate (1) — 3,107 1,623 9,134 101,682 115,546 Total commercial real estate 21,825 3,107 3,563 58,469 6,546,556 6,633,520 Home equity 9,828 — 1,505 4,033 611,181 626,547 Residential real estate, including PCI 17,214 1,437 229 8,808 841,416 869,104 Premium finance receivables Commercial insurance loans 17,342 8,547 6,543 17,756 2,525,962 2,576,150 Life insurance loans — — 5,125 11,420 3,986,181 4,002,726 PCI - life insurance loans (1) — — — — 187,235 187,235 Consumer and other, including PCI 720 269 216 291 104,485 105,981 Total loans, net of unearned income $ 80,936 $ 14,216 $ 17,952 $ 155,010 $ 21,794,020 $ 22,062,134 (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 March 31, 2019 , December 31, 2018 and March 31, 2018 : Performing Non-performing Total (Dollars in thousands) March 31, December 31, March 31, March 31, December 31, March 31, March 31, December 31, March 31, Loan Balances: Commercial Commercial, industrial and other $ 5,212,095 $ 5,085,798 $ 4,550,829 $ 38,858 $ 34,298 $ 10,051 $ 5,250,953 $ 5,120,096 $ 4,560,880 Franchise 864,107 932,928 932,957 15,799 16,051 2,401 879,906 948,979 935,358 Mortgage warehouse lines of credit 174,284 144,199 163,470 — — — 174,284 144,199 163,470 Asset-based lending 1,039,699 1,025,421 976,541 1,135 635 1,194 1,040,834 1,026,056 977,735 Leases 622,884 565,680 413,837 — — 361 622,884 565,680 414,198 PCI - commercial (1) 25,330 23,528 9,230 — — — 25,330 23,528 9,230 Total commercial 7,938,399 7,777,554 7,046,864 55,792 50,984 14,007 7,994,191 7,828,538 7,060,871 Commercial real estate Construction 802,639 759,270 812,497 1,030 1,554 3,139 803,669 760,824 815,636 Land 147,647 141,374 122,508 54 107 182 147,701 141,481 122,690 Office 921,893 935,693 890,597 4,482 3,629 474 926,375 939,322 891,071 Industrial 964,693 901,963 904,717 267 285 1,427 964,960 902,248 906,144 Retail 887,622 881,725 883,348 7,645 10,753 12,274 895,267 892,478 895,622 Multi-family 1,117,082 976,249 931,336 303 311 19 1,117,385 976,560 931,355 Mixed use and other 2,005,335 2,202,705 1,951,146 2,152 2,490 4,310 2,007,487 2,205,195 1,955,456 PCI - commercial real estate (1) 110,661 115,144 115,546 — — — 110,661 115,144 115,546 Total commercial real estate 6,957,572 6,914,123 6,611,695 15,933 19,129 21,825 6,973,505 6,933,252 6,633,520 Home equity 520,563 545,196 616,719 7,885 7,147 9,828 528,448 552,343 626,547 Residential real estate, including PCI 1,037,615 986,081 851,890 15,909 16,383 17,214 1,053,524 1,002,464 869,104 Premium finance receivables Commercial insurance loans 2,967,433 2,822,525 2,550,261 21,355 19,134 25,889 2,988,788 2,841,659 2,576,150 Life insurance loans 4,389,431 4,373,891 4,002,726 168 — — 4,389,599 4,373,891 4,002,726 PCI - life insurance loans (1) 165,770 167,903 187,235 — — — 165,770 167,903 187,235 Consumer and other, including PCI 120,260 120,184 105,054 544 457 927 120,804 120,641 105,981 Total loans, net of unearned income $ 24,097,043 $ 23,707,457 $ 21,972,444 $ 117,586 $ 113,234 $ 89,690 $ 24,214,629 $ 23,820,691 $ 22,062,134 (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 months ended March 31, 2019 and 2018 is as follows: Three months ended March 31, 2019 Commercial Real Estate Home Equity Residential Real Estate Premium Finance Receivables Consumer and Other Total Loans (Dollars 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 — (24 ) (7 ) (7 ) 11 — (27 ) Reclassification from allowance for unfunded lending-related commitments — (16 ) — — — — (16 ) Charge-offs (503 ) (3,734 ) (88 ) (3 ) (2,210 ) (102 ) (6,640 ) Recoveries 318 480 62 29 556 56 1,501 Provision for credit losses 6,997 877 153 417 2,147 33 10,624 Allowance for loan losses at period end $ 74,638 $ 57,850 $ 8,627 $ 7,630 $ 8,219 $ 1,248 $ 158,212 Allowance for unfunded lending-related commitments at period end $ — $ 1,410 $ — $ — $ — $ — $ 1,410 Allowance for credit losses at period end $ 74,638 $ 59,260 $ 8,627 $ 7,630 $ 8,219 $ 1,248 $ 159,622 Individually evaluated for impairment $ 11,858 $ 517 $ 796 $ 302 $ — $ 133 $ 13,606 Collectively evaluated for impairment 62,317 58,623 7,831 7,267 8,219 1,115 145,372 Loans acquired with deteriorated credit quality 463 120 — 61 — — 644 Loans at period end Individually evaluated for impairment $ 75,442 $ 30,300 $ 15,779 $ 22,464 $ — $ 376 $ 144,361 Collectively evaluated for impairment 7,893,419 6,832,544 512,669 921,204 7,378,387 117,753 23,655,976 Loans acquired with deteriorated credit quality 25,330 110,661 — 8,785 165,770 2,675 313,221 Loans held at fair value — — — 101,071 — — 101,071 Three months ended March 31, 2018 Commercial Commercial Real Estate Home Equity Residential Real Estate Premium Finance Receivables Consumer and Other Total Loans (Dollars in thousands) 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 (1 ) (24 ) — (3 ) (12 ) — (40 ) Reclassification from allowance for unfunded lending-related commitments — 26 — — — — 26 Charge-offs (2,687 ) (813 ) (357 ) (571 ) (4,721 ) (129 ) (9,278 ) Recoveries 262 1,687 123 40 385 47 2,544 Provision for credit losses 2,251 1,378 (399 ) 124 4,835 157 8,346 Allowance for loan losses at period end $ 57,636 $ 57,481 $ 9,860 $ 6,278 $ 7,333 $ 915 $ 139,503 Allowance for unfunded lending-related commitments at period end $ — $ 1,243 $ — $ — $ — $ — $ 1,243 Allowance for credit losses at period end $ 57,636 $ 58,724 $ 9,860 $ 6,278 $ 7,333 $ 915 $ 140,746 Individually evaluated for impairment $ 2,344 $ 3,611 $ 749 $ 148 $ — $ 25 $ 6,877 Collectively evaluated for impairment 54,789 55,042 9,111 6,029 7,333 890 133,194 Loans acquired with deteriorated credit quality 503 71 — 101 — — 675 Loans at period end Individually evaluated for impairment $ 33,810 $ 38,237 $ 10,102 $ 20,558 $ — $ 748 $ 103,455 Collectively evaluated for impairment 7,017,831 6,479,737 616,445 768,859 6,578,876 103,224 21,564,972 Loans acquired with deteriorated credit quality 9,230 115,546 — 11,725 187,235 2,009 325,745 Loans held at fair value — — — 67,962 — — 67,962
Summary of Impaired Loans, Including Restructured Loans	A summary of impaired loans, including troubled debt restructurings ("TDRs"), is as follows: March 31, December 31, March 31, (Dollars in thousands) 2019 2018 2018 Impaired loans (included in non-performing and TDRs): Impaired loans with an allowance for loan loss required (1) $ 72,539 $ 60,219 $ 37,572 Impaired loans with no allowance for loan loss required 71,579 67,050 65,559 Total impaired loans (2) $ 144,118 $ 127,269 $ 103,131 Allowance for loan losses related to impaired loans $ 13,599 $ 11,437 $ 6,863 TDRs $ 88,362 $ 66,102 $ 47,676 (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 Three Months Ended As of March 31, 2019 March 31, 2019 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Dollars in thousands) Impaired loans with a related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 33,360 $ 33,623 $ 6,919 $ 33,641 $ 656 Franchise 15,776 16,256 4,702 15,855 243 Asset-based lending 331 331 237 335 7 Leases 1,691 1,691 — 1,701 21 Commercial real estate Construction — — — — — Land 45 45 9 45 1 Office 3,055 3,120 149 3,070 35 Industrial — — — — — Retail 5,114 5,114 41 5,116 51 Multi-family 1,185 1,185 30 1,185 12 Mixed use and other 1,082 1,118 281 1,085 13 Home equity 6,316 6,694 796 6,335 60 Residential real estate 4,390 4,664 302 4,403 42 Consumer and other 194 241 133 195 3 Impaired loans with no related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 17,411 $ 20,125 $ — $ 17,481 $ 316 Franchise 5,145 5,147 — 5,147 101 Asset-based lending 934 1,332 — 1,120 24 Leases 794 831 — 810 13 Commercial real estate Construction 2,146 2,671 — 2,496 33 Land 3,285 3,380 — 3,301 47 Office 1,991 2,006 — 1,993 29 Industrial 295 432 — 304 7 Retail 8,059 11,405 — 10,198 150 Multi-family 303 403 — 306 3 Mixed use and other 3,496 3,812 — 3,528 58 Home equity 9,463 12,658 — 9,560 155 Residential real estate 18,075 20,823 — 18,098 225 Consumer and other 182 276 — 184 3 Total impaired loans, net of unearned income $ 144,118 $ 159,383 $ 13,599 $ 147,492 $ 2,308 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 (Dollars 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 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 Three Months Ended As of March 31, 2018 March 31, 2018 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Dollars in thousands) Impaired loans with a related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 5,521 $ 5,587 $ 1,738 $ 5,607 $ 83 Franchise — — — — — Asset-based lending 1,107 1,107 475 1,166 20 Leases 2,213 2,221 131 2,247 27 Commercial real estate Construction 3,097 3,897 599 3,097 50 Land 1,500 1,500 3 1,567 17 Office 1,479 2,078 73 1,483 24 Industrial 63 172 1 63 2 Retail 15,347 15,415 2,512 15,315 166 Multi-family 1,234 1,277 21 1,254 12 Mixed use and other 2,036 2,281 388 2,054 30 Home equity 1,697 1,889 749 1,699 19 Residential real estate 2,253 2,956 148 2,258 33 Consumer and other 25 27 25 25 — Impaired loans with no related ASC 310 allowance recorded Commercial Commercial, industrial and other $ 5,480 $ 6,777 $ — $ 5,650 $ 109 Franchise 18,657 18,661 — 18,675 239 Asset-based lending 86 231 — 182 3 Leases 746 746 — 754 11 Commercial real estate Construction 1,363 1,364 — 1,364 15 Land 2,329 2,434 — 2,339 31 Office 59 754 — 61 11 Industrial 1,427 1,485 — 1,430 20 Retail 2,695 2,992 — 2,710 58 Multi-family — 84 — — 1 Mixed use and other 5,284 5,981 — 5,340 80 Home equity 8,405 12,535 — 8,255 151 Residential real estate 18,305 20,983 — 18,630 222 Consumer and other 723 870 — 726 12 Total impaired loans, net of unearned income $ 103,131 $ 116,304 $ 6,863 $ 103,951 $ 1,446
Summary of the Post-Modification Balance of TDRs	The tables below present a summary of the post-modification balance of loans restructured during the three months ended March 31, 2019 and 2018 , respectively, which represent TDRs: Three months ended March 31, 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 8 $ 18,854 1 $ 432 — $ — 7 $ 18,422 — $ — Asset-based lending 1 76 1 76 — — — — — — Commercial real estate Mixed use and other 1 302 — — — — 1 302 — — Residential real estate and other 20 4,486 20 4,486 6 1,547 — — — — Total loans 30 $ 23,718 22 $ 4,994 6 $ 1,547 8 $ 18,724 — $ — (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. Three months ended March 31, 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 $ 96 1 $ 96 — $ — — $ — — $ — Commercial real estate Office 1 59 1 59 — — — — — — Mixed use and other — — — — — — — — — — Residential real estate and other 5 835 5 835 2 111 — — — — Total loans 7 $ 990 7 $ 990 2 $ 111 — $ — — $ — (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.
Schedule of Loans Restructured with Payments in Default	The following table presents a summary of all loans restructured in TDRs during the twelve months ended March 31, 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 March 31, 2019 Three Months Ended March 31, 2019 As of March 31, 2018 Three Months Ended March 31, 2018 Total (1)(3) Payments in Default (2)(3) Total (1)(3) Payments in Default (2)(3) Count Balance Count Balance Count Balance Count Balance Commercial Commercial, industrial and other 11 $ 32,199 1 $ 77 5 $ 3,776 5 $ 3,776 Franchise 3 5,157 — — — — — — Asset-based lending 2 206 2 206 — — — — Leases 1 239 — — 3 16,256 — — Commercial real estate Office — — — — 1 59 — — Mixed use and other 3 757 3 757 — — — — Residential real estate and other 74 13,411 9 1,759 15 3,711 5 2,551 Total loans 94 $ 51,969 15 $ 2,799 24 $ 23,802 10 $ 6,327 (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.

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 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 March 31, Community banking $ 465,085 $ — $ — $ 37 $ 465,122 Specialty finance 38,343 — — 480 38,823 Wealth management 69,713 — — — 69,713 Total $ 573,141 $ — $ — $ 517 $ 573,658
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 March 31, 2019 is as follows: (Dollars in thousands) March 31, December 31, March 31, Community banking segment: Core deposit intangibles with finite lives: Gross carrying amount $ 55,447 $ 55,366 $ 37,272 Accumulated amortization (31,022 ) (29,406 ) (26,280 ) Net carrying amount $ 24,425 $ 25,960 $ 10,992 Trademark with indefinite lives: Carrying amount 5,800 5,800 5,800 Total net carrying amount $ 30,225 $ 31,760 $ 16,792 Specialty finance segment: Customer list intangibles with finite lives: Gross carrying amount $ 1,961 $ 1,958 $ 1,967 Accumulated amortization (1,468 ) (1,436 ) (1,335 ) Net carrying amount $ 493 $ 522 $ 632 Wealth management segment: Customer list and other intangibles with finite lives: Gross carrying amount $ 20,430 $ 20,430 $ 7,940 Accumulated amortization (4,582 ) (3,288 ) (2,951 ) Net carrying amount $ 15,848 $ 17,142 $ 4,989 Total intangible assets: Gross carrying amount $ 83,638 $ 83,554 $ 52,979 Accumulated amortization (37,072 ) (34,130 ) (30,566 ) Total intangible assets, net $ 46,566 $ 49,424 $ 22,413
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 March 31, 2019 is as follows: (Dollars in thousands) March 31, December 31, March 31, Community banking segment: Core deposit intangibles with finite lives: Gross carrying amount $ 55,447 $ 55,366 $ 37,272 Accumulated amortization (31,022 ) (29,406 ) (26,280 ) Net carrying amount $ 24,425 $ 25,960 $ 10,992 Trademark with indefinite lives: Carrying amount 5,800 5,800 5,800 Total net carrying amount $ 30,225 $ 31,760 $ 16,792 Specialty finance segment: Customer list intangibles with finite lives: Gross carrying amount $ 1,961 $ 1,958 $ 1,967 Accumulated amortization (1,468 ) (1,436 ) (1,335 ) Net carrying amount $ 493 $ 522 $ 632 Wealth management segment: Customer list and other intangibles with finite lives: Gross carrying amount $ 20,430 $ 20,430 $ 7,940 Accumulated amortization (4,582 ) (3,288 ) (2,951 ) Net carrying amount $ 15,848 $ 17,142 $ 4,989 Total intangible assets: Gross carrying amount $ 83,638 $ 83,554 $ 52,979 Accumulated amortization (37,072 ) (34,130 ) (30,566 ) Total intangible assets, net $ 46,566 $ 49,424 $ 22,413
Estimated Amortization	Estimated amortization Actual in three months ended March 31, 2019 $ 2,942 Estimated remaining in 2019 8,414 Estimated—2020 9,595 Estimated—2021 6,385 Estimated—2022 4,957 Estimated—2023 3,630

Mortgage Servicing Rights ("M_2

Mortgage Servicing Rights ("MSRs") (Tables)	3 Months Ended
	Mar. 31, 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 March 31, March 31, (Dollars in thousands) 2019 2018 Balance at beginning of the period $ 75,183 $ 33,676 Additions from loans sold with servicing retained 6,580 4,159 Additions from acquisitions — 13,806 Estimate of changes in fair value due to: Payoffs and paydowns (1,997 ) (1,202 ) Changes in valuation inputs or assumptions (8,744 ) 4,133 Fair value at end of the period $ 71,022 $ 54,572 Unpaid principal balance of mortgage loans serviced for others $ 7,014,269 $ 4,795,335

Deposits (Tables)

Deposits (Tables)	3 Months Ended
	Mar. 31, 2019
Deposits [Abstract]
Summary of Deposits	The following table is a summary of deposits as of the dates shown: (Dollars in thousands) March 31, December 31, March 31, Balance: Non-interest bearing $ 6,353,456 $ 6,569,880 $ 6,612,319 NOW and interest bearing demand deposits 2,948,576 2,897,133 2,315,122 Wealth management deposits 3,328,781 2,996,764 2,495,134 Money market 6,093,596 5,704,866 4,617,122 Savings 2,729,626 2,665,194 2,901,504 Time certificates of deposit 5,350,707 5,260,841 4,338,126 Total deposits $ 26,804,742 $ 26,094,678 $ 23,279,327 Mix: Non-interest bearing 24 % 25 % 28 % NOW and interest bearing demand deposits 11 11 10 Wealth management deposits 12 12 11 Money market 23 22 20 Savings 10 10 12 Time certificates of deposit 20 20 19 Total deposits 100 % 100 % 100 %

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances, Other Borrowings and Subordinated Notes (Tables)	3 Months Ended
	Mar. 31, 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: (Dollars in thousands) March 31, December 31, March 31, FHLB advances $ 576,353 $ 426,326 $ 915,000 Other borrowings: Notes payable 139,119 144,461 33,727 Short-term borrowings 16,212 50,593 17,977 Other 47,394 47,722 48,742 Secured borrowings 169,469 151,079 146,646 Total other borrowings 372,194 393,855 247,092 Subordinated notes 139,235 139,210 139,111 Total FHLB advances, other borrowings and subordinated notes $ 1,087,782 $ 959,391 $ 1,301,203
Summary of Pledged Securities Related to Securities Sold Under Repurchase Agreements	The following is a summary of these securities pledged as of March 31, 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: (Dollars in thousands) Overnight Sweep Collateral Available-for-sale securities pledged U.S. Government agencies $ — Mortgage-backed securities 38,942 Held-to-maturity securities pledged U.S. Government agencies 14,400 Total collateral pledged $ 53,342 Excess collateral 37,130 Securities sold under repurchase agreements $ 16,212

Junior Subordinated Debentures

Junior Subordinated Debentures (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 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 3/31/2019 Issue Date Maturity Date Earliest Redemption Date Wintrust Capital Trust III $ 774 $ 25,000 $ 25,774 L+3.25 6.04 % 04/2003 04/2033 04/2008 Wintrust Statutory Trust IV 619 20,000 20,619 L+2.80 5.39 % 12/2003 12/2033 12/2008 Wintrust Statutory Trust V 1,238 40,000 41,238 L+2.60 5.19 % 05/2004 05/2034 06/2009 Wintrust Capital Trust VII 1,550 50,000 51,550 L+1.95 4.56 % 12/2004 03/2035 03/2010 Wintrust Capital Trust VIII 1,238 25,000 26,238 L+1.45 4.04 % 08/2005 09/2035 09/2010 Wintrust Capital Trust IX 1,547 50,000 51,547 L+1.63 4.24 % 09/2006 09/2036 09/2011 Northview Capital Trust I 186 6,000 6,186 L+3.00 5.74 % 08/2003 11/2033 08/2008 Town Bankshares Capital Trust I 186 6,000 6,186 L+3.00 5.74 % 08/2003 11/2033 08/2008 First Northwest Capital Trust I 155 5,000 5,155 L+3.00 5.59 % 05/2004 05/2034 05/2009 Suburban Illinois Capital Trust II 464 15,000 15,464 L+1.75 4.36 % 12/2006 12/2036 12/2011 Community Financial Shares Statutory Trust II 109 3,500 3,609 L+1.62 4.23 % 06/2007 09/2037 06/2012 Total $ 253,566 4.82 %

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 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 Revenue from contracts with customers Location in income statement March 31, March 31, Brokerage and insurance product commissions Wealth management $ 4,516 $ 6,031 Trust Wealth management 5,327 3,417 Asset management Wealth management 14,134 13,538 Total wealth management 23,977 22,986 Mortgage broker fees Mortgage banking 182 279 Service charges on deposit accounts Service charges on deposit accounts 8,848 8,857 Administrative services Other non-interest income 1,030 1,061 Card related fees Other non-interest income 2,556 2,139 Other deposit related fees Other non-interest income 2,789 2,858 Total revenue from contracts with customers $ 39,382 $ 38,180
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) March 31, December 31, March 31, Contract assets $ — $ — $ — Contract liabilities $ 1,639 $ 1,727 $ 1,614 Mortgage broker fees receivable $ 34 $ 44 $ 20 Administrative services receivable 147 275 — Wealth management receivable 10,397 13,610 8,111 Card related fees receivable 385 — 320 Total receivables from contracts with customer $ 10,963 $ 13,929 $ 8,451
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 $ 671 Estimated—2020 369 Estimated—2021 303 Estimated—2022 153 Estimated—2023 143 Estimated—2024 — Total $ 1,639

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 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) March 31, March 31, Net interest income: Community Banking $ 211,424 $ 183,254 $ 28,170 15 % Specialty Finance 37,706 32,912 4,794 15 Wealth Management 7,502 4,441 3,061 69 Total Operating Segments 256,632 220,607 36,025 16 Intersegment Eliminations 5,354 4,475 879 20 Consolidated net interest income $ 261,986 $ 225,082 $ 36,904 16 % Non-interest income: Community Banking $ 48,267 $ 56,547 $ (8,280 ) (15 )% Specialty Finance 19,606 15,725 3,881 25 Wealth Management 25,035 22,958 2,077 9 Total Operating Segments 92,908 95,230 (2,322 ) (2 ) Intersegment Eliminations (11,251 ) (9,551 ) (1,700 ) (18 ) Consolidated non-interest income $ 81,657 $ 85,679 $ (4,022 ) (5 )% Net revenue: Community Banking $ 259,691 $ 239,801 $ 19,890 8 % Specialty Finance 57,312 48,637 8,675 18 Wealth Management 32,537 27,399 5,138 19 Total Operating Segments 349,540 315,837 33,703 11 Intersegment Eliminations (5,897 ) (5,076 ) (821 ) (16 ) Consolidated net revenue $ 343,643 $ 310,761 $ 32,882 11 % Segment profit: Community Banking $ 60,326 $ 57,280 $ 3,046 5 % Specialty Finance 21,848 20,000 1,848 9 Wealth Management 6,972 4,701 2,271 48 Consolidated net income $ 89,146 $ 81,981 $ 7,165 9 % Segment assets: Community Banking $ 25,997,025 $ 23,213,499 $ 2,783,526 12 % Specialty Finance 5,234,210 4,568,906 665,304 15 Wealth Management 1,127,386 674,367 453,019 67 Consolidated total assets $ 32,358,621 $ 28,456,772 $ 3,901,849 14 %

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2019 , December 31, 2018 and March 31, 2018 : Derivative Assets Derivative Liabilities (Dollars in thousands) March 31, December 31, March 31, March 31, December 31, March 31, Derivatives designated as hedging instruments under ASC 815: Interest rate derivatives designated as Cash Flow Hedges $ 3,353 $ 6,270 $ 15,012 $ 2,589 $ 1,656 $ 35 Interest rate derivatives designated as Fair Value Hedges 1,260 2,636 4,962 3,167 1,756 — Total derivatives designated as hedging instruments under ASC 815 $ 4,613 $ 8,906 $ 19,974 $ 5,756 $ 3,412 $ 35 Derivatives not designated as hedging instruments under ASC 815: Interest rate derivatives $ 63,704 $ 59,519 $ 52,996 $ 63,536 $ 59,159 $ 52,408 Interest rate lock commitments 4,387 3,405 5,449 — 2,694 1,207 Forward commitments to sell mortgage loans 2,416 — 3 4,180 1,486 1,464 Foreign exchange contracts 384 1,342 538 396 1,337 585 Total derivatives not designated as hedging instruments under ASC 815 $ 70,891 $ 64,266 $ 58,986 $ 68,112 $ 64,676 $ 55,664 Total Derivatives $ 75,504 $ 73,172 $ 78,960 $ 73,868 $ 68,088 $ 55,699
Schedule Of Cash Flow Hedging Instruments	The table below provides details on each of these cash flow hedges as of March 31, 2019 : March 31, 2019 (Dollars in thousands) Notional Fair Value Maturity Date Amount Asset (Liability) Interest Rate Swaps: June 2019 $ 200,000 $ 429 July 2019 250,000 1,083 August 2019 275,000 1,841 Interest Rate Collars: September 2023 139,286 (2,589 ) Total Cash Flow Hedges $ 864,286 $ 764
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 (Dollars in thousands) March 31, March 31, Unrealized gain at beginning of period $ 10,742 $ 11,902 Amount reclassified from accumulated other comprehensive income to interest expense on deposits and other borrowings (3,562 ) (680 ) Amount of (loss) gain recognized in other comprehensive income (1,434 ) 3,755 Unrealized gain at end of period $ 5,746 $ 14,977
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 March 31, 2019 : March 31, 2019 (Dollars 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 $ 165,746 $ 1,776 $ — Available-for-sale debt securities 1,461 57 — The following table presents the loss or gain recognized related to derivative instruments that are designated as fair value hedges for the respective period: (Dollars in thousands) Derivatives in Fair Value Hedging Relationships Location of (Loss)/Gain Recognized in Income on Derivative Three Months Ended March 31, 2019 Interest rate swaps Interest and fees on loans $ (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: (Dollars in thousands) Three Months Ended Derivative Location in income statement March 31, March 31, Interest rate swaps and caps Trading (losses) gains, net $ (191 ) $ 153 Mortgage banking derivatives Mortgage banking revenue 50 1,418 Covered call options Fees from covered call options 1,784 1,597 Foreign exchange contracts Trading (losses) gains, net (12 ) (43 )
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 (Dollars in thousands) March 31, December 31, March 31, March 31, December 31, March 31, Gross Amounts Recognized $ 68,317 $ 68,425 $ 72,970 $ 69,292 $ 62,571 $ 52,443 Less: Amounts offset in the Statements of Financial Condition — — — — — — Net amount presented in the Statements of Financial Condition $ 68,317 $ 68,425 $ 72,970 $ 69,292 $ 62,571 $ 52,443 Gross amounts not offset in the Statements of Financial Condition Offsetting Derivative Positions (18,878 ) (28,124 ) (9,627 ) (18,878 ) (28,124 ) (9,627 ) Collateral Posted — (23,810 ) (54,490 ) (45,540 ) (2,640 ) (340 ) Net Credit Exposure $ 49,439 $ 16,491 $ 8,853 $ 4,874 $ 31,807 $ 42,476
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 (Dollars in thousands) March 31, December 31, March 31, March 31, December 31, March 31, Gross Amounts Recognized $ 68,317 $ 68,425 $ 72,970 $ 69,292 $ 62,571 $ 52,443 Less: Amounts offset in the Statements of Financial Condition — — — — — — Net amount presented in the Statements of Financial Condition $ 68,317 $ 68,425 $ 72,970 $ 69,292 $ 62,571 $ 52,443 Gross amounts not offset in the Statements of Financial Condition Offsetting Derivative Positions (18,878 ) (28,124 ) (9,627 ) (18,878 ) (28,124 ) (9,627 ) Collateral Posted — (23,810 ) (54,490 ) (45,540 ) (2,640 ) (340 ) Net Credit Exposure $ 49,439 $ 16,491 $ 8,853 $ 4,874 $ 31,807 $ 42,476

Fair Values of Assets and Lia_2

Fair Values of Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 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: March 31, 2019 (Dollars in thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 126,718 $ 126,718 $ — $ — U.S. Government agencies 130,687 — 127,694 2,993 Municipal 136,353 — 32,519 103,834 Corporate notes 93,333 — 93,333 — Mortgage-backed 1,698,691 — 1,698,691 — Trading account securities 559 — 559 — Equity securities with readily determinable fair value 47,653 39,587 8,066 — Mortgage loans held-for-sale 248,557 — 248,557 — Loans held-for-investment 101,071 — 89,822 11,249 MSRs 71,022 — — 71,022 Nonqualified deferred compensation assets 13,230 — 13,230 — Derivative assets 75,504 — 72,415 3,089 Total $ 2,743,378 $ 166,305 $ 2,384,886 $ 192,187 Derivative liabilities $ 73,868 $ — $ 73,868 $ — 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 $ — March 31, 2018 (Dollars in thousands) Total Level 1 Level 2 Level 3 Available-for-sale securities U.S. Treasury $ 24,727 $ — $ 24,727 $ — U.S. Government agencies 149,336 — 145,720 3,616 Municipal 121,758 — 37,166 84,592 Corporate notes 99,714 — 99,714 — Mortgage-backed 1,500,153 — 1,500,153 — Trading account securities 1,682 — 1,682 — Equity securities with readily determinable fair value 37,832 — 37,832 — Mortgage loans held-for-sale 411,505 — 411,505 — Loans held-for-investment 67,962 — 41,342 26,620 MSRs 54,572 — — 54,572 Nonqualified deferred compensation assets 11,724 — 11,724 — Derivative assets 78,960 — 74,355 4,605 Total $ 2,559,925 $ — $ 2,385,920 $ 174,005 Derivative liabilities $ 55,699 $ — $ 55,699 $ —
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 months ended March 31, 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 January 1, 2019 $ 108,926 $ 3,150 $ 11,347 $ 75,183 $ 2,457 Total net gains (losses) included in: Net income (1) — — 167 (4,161 ) 632 Other comprehensive loss 1,537 1 — — — Purchases 969 — — — — Issuances — — — — — Sales — — — — — Settlements (7,598 ) (158 ) (465 ) — — Net transfers into/(out of) Level 3 — — 200 — — Balance at March 31, 2019 $ 103,834 $ 2,993 $ 11,249 $ 71,022 $ 3,089 (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, 2018 $ 77,181 $ 3,779 $ 33,717 $ 33,676 $ 2,157 Total net gains (losses) included in: Net income (1) — — (1,128 ) 7,090 2,448 Other comprehensive income (loss) (2,190 ) (163 ) — — — Purchases (2) 12,270 — — 13,806 — Issuances — — — — — Sales — — — — — Settlements (2,669 ) — (6,255 ) — — Net transfers into/(out of) Level 3 — — 286 — — Balance at March 31, 2018 $ 84,592 $ 3,616 $ 26,620 $ 54,572 $ 4,605 (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) Purchased as a part of the Veterans First business combination. 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 March 31, 2019 . March 31, 2019 Three Months Ended March 31, 2019 Fair Value Losses Recognized, net (Dollars in thousands) Total Level 1 Level 2 Level 3 Impaired loans—collateral based $ 101,331 $ — $ — $ 101,331 $ 4,378 Other real estate owned (1) 21,520 — — 21,520 574 Total $ 122,851 $ — $ — $ 122,851 $ 4,952 (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 March 31, 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 $ 103,834 Bond pricing Equivalent rating BBB-AA+ N/A Increase U.S. Government agencies 2,993 Bond pricing Equivalent rating AAA AAA Increase Loans held-for-investment 11,249 Discounted cash flows Discount rate 3%-4% 3.94% Decrease Credit discount 0%-7% 1.24% Decrease Constant prepayment rate (CPR) 14.01% 14.01% Decrease MSRs 71,022 Discounted cash flows Discount rate 7%-17% 9.96% Decrease Constant prepayment rate (CPR) 0%-93% 14.01% Decrease Cost of servicing $70-$200 $77 Decrease Cost of servicing - delinquent $200-$1,000 $407 Decrease Derivatives 3,089 Discounted cash flows Pull-through rate 0%-100% 78.82% Increase Measured at fair value on a non-recurring basis: Impaired loans—collateral based $ 101,331 Appraisal value Appraisal adjustment - cost of sale 10% 10.00% Decrease Other real estate owned 21,520 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 March 31, 2019 At December 31, 2018 At March 31, 2018 Carrying Fair Carrying Fair Carrying Fair (Dollars in thousands) Value Value Value Value Value Value Financial Assets: Cash and cash equivalents $ 270,823 $ 270,823 $ 392,200 $ 392,200 $ 231,464 $ 231,464 Interest bearing deposits with banks 1,609,852 1,609,852 1,099,594 1,099,594 980,380 980,380 Available-for-sale securities 2,185,782 2,185,782 2,126,081 2,126,081 1,895,688 1,895,688 Held-to-maturity securities 1,051,542 1,041,695 1,067,439 1,036,096 892,937 862,527 Trading account securities 559 559 1,692 1,692 1,682 1,682 Equity securities with readily determinable fair value 47,653 47,653 34,717 34,717 37,832 37,832 FHLB and FRB stock, at cost 89,013 89,013 91,354 91,354 104,956 104,956 Brokerage customer receivables 14,219 14,219 12,609 12,609 24,531 24,531 Mortgage loans held-for-sale, at fair value 248,557 248,557 264,070 264,070 411,505 411,505 Loans held-for-investment, at fair value 101,071 101,071 93,857 93,857 67,962 67,962 Loans held-for-investment, at amortized cost 24,113,558 24,123,328 23,726,834 23,780,739 21,994,172 22,234,795 Nonqualified deferred compensation assets 13,230 13,230 11,282 11,282 11,724 11,724 Derivative assets 75,504 75,504 73,172 73,172 78,960 78,960 Accrued interest receivable and other 275,464 275,464 260,281 260,281 236,131 236,131 Total financial assets $ 30,096,827 $ 30,096,750 $ 29,255,182 $ 29,277,744 $ 26,969,924 $ 27,180,137 Financial Liabilities Non-maturity deposits $ 21,454,035 $ 21,454,035 $ 20,833,837 $ 20,833,837 $ 18,941,201 $ 18,941,201 Deposits with stated maturities 5,350,707 5,377,388 5,260,841 5,283,063 4,338,126 4,344,584 FHLB advances 576,353 604,976 426,326 429,830 915,000 916,513 Other borrowings 372,194 372,194 393,855 393,855 247,092 247,092 Subordinated notes 139,235 144,019 139,210 138,345 139,111 140,889 Junior subordinated debentures 253,566 252,451 253,566 263,846 253,566 268,873 Derivative liabilities 73,868 73,868 68,088 68,088 55,699 55,699 Accrued interest payable 19,569 19,569 16,025 16,025 11,442 11,442 Total financial liabilities $ 28,239,527 $ 28,298,500 $ 27,391,748 $ 27,426,889 $ 24,901,237 $ 24,926,293

Stock-Based Compensation Plans

Stock-Based Compensation Plans (Tables)	3 Months Ended
	Mar. 31, 2019
Share-based Compensation [Abstract]
Summary Of Stock Option Activity	A summary of the Company's stock option activity for the three months ended March 31, 2019 and March 31, 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 $ 42.25 Granted — — Exercised (78,667 ) 37.41 Forfeited or canceled — — Outstanding at March 31, 2019 716,347 $ 42.79 2.9 $ 17,583 Exercisable at March 31, 2019 701,227 $ 42.75 2.9 $ 17,234 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 (169,387 ) 42.47 Forfeited or canceled (1,703 ) 40.87 Outstanding at March 31, 2018 913,666 $ 41.89 3.7 $ 40,351 Exercisable at March 31, 2018 712,535 $ 42.00 3.4 $ 31,391 (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 three months ended March 31, 2019 and March 31, 2018 is presented below: Three months ended March 31, 2019 Three months ended March 31, 2018 Restricted Shares Common Shares Weighted Average Grant-Date Fair Value Common Shares Weighted Average Grant-Date Fair Value Outstanding at January 1 143,263 $ 60.80 127,787 $ 53.33 Granted 9,673 71.66 20,700 86.42 Vested and issued (11,042 ) 75.00 (7,258 ) 53.47 Forfeited or canceled (215 ) 93.14 (982 ) 55.39 Outstanding at March 31 141,679 $ 60.38 140,247 $ 58.20 Vested, but not issuable at March 31 90,824 $ 52.02 89,924 $ 51.71 A summary of the Plans' performance-based stock award activity, based on the target level of the awards, for the three months ended March 31, 2019 and March 31, 2018 is presented below: Three months ended March 31, 2019 Three months ended March 31, 2018 Performance-based Stock Common Weighted Common Weighted Outstanding at January 1 396,855 $ 67.71 359,196 $ 54.37 Granted 173,856 71.57 127,419 88.20 Vested and issued (94,288 ) 41.00 (82,307 ) 44.39 Forfeited (2,747 ) 67.85 (6,580 ) 49.42 Outstanding at March 31 473,676 $ 74.44 397,728 $ 67.35 Vested, but deferred at March 31 33,451 $ 42.70 21,388 $ 43.32

Shareholders' Equity and Earn_2

Shareholders' Equity and Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 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 January 1, 2019 $ (42,353 ) $ 7,857 $ (42,376 ) $ (76,872 ) Other comprehensive income (loss) during the period, net of tax, before reclassifications 27,956 (1,039 ) 2,277 29,194 Amount reclassified from accumulated other comprehensive loss into net income, net of tax 49 (2,612 ) — (2,563 ) 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 (103 ) — — (103 ) Net other comprehensive income (loss) during the period, net of tax $ 27,902 $ (3,651 ) $ 2,277 $ 26,528 Balance at March 31, 2019 $ (14,451 ) $ 4,206 $ (40,099 ) $ (50,344 ) Accumulated Accumulated Accumulated Total 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 (26,474 ) 2,746 (2,897 ) (26,625 ) Amount reclassified from accumulated other comprehensive loss into net income, net of tax 713 (497 ) — 216 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 3 — — 3 Net other comprehensive (loss) income during the period, net of tax $ (25,758 ) $ 2,249 $ (2,897 ) $ (26,406 ) Balance at March 31, 2018 $ (47,968 ) $ 10,956 $ (36,083 ) $ (73,095 )
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 Impacted Line on the Consolidated Statements of Income March 31, 2019 2018 Accumulated unrealized losses on securities Losses included in net income $ (67 ) $ (975 ) Gains (losses) on investment securities, net (67 ) (975 ) Income before taxes Tax effect $ 18 $ 262 Income tax expense Net of tax $ (49 ) $ (713 ) Net income Accumulated unrealized losses on derivative instruments Amount reclassified to interest expense on deposits $ (3,589 ) $ (680 ) Interest on deposits Amount reclassified to interest expense on other borrowings 27 — Interest on other borrowings 3,562 680 Income before taxes Tax effect $ (950 ) $ (183 ) Income tax expense Net of tax $ 2,612 $ 497 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 (In thousands, except per share data) March 31, March 31, Net income $ 89,146 $ 81,981 Less: Preferred stock dividends 2,050 2,050 Net income applicable to common shares (A) 87,096 79,931 Weighted average common shares outstanding (B) 56,529 56,137 Effect of dilutive potential common shares Common stock equivalents 699 888 Weighted average common shares and effect of dilutive potential common shares (C) 57,228 57,025 Net income per common share: Basic (A/B) $ 1.54 $ 1.42 Diluted (A/C) $ 1.52 $ 1.40

Recent Accounting Development_2

Recent Accounting Developments - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liability	$ 196,853
Right of use asset	$ 165,800
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
	Mar. 31, 2019USD ($)
Accounting Changes and Error Corrections [Abstract]
Operating lease cost	$ 6,095
Short-term lease cost	181
Variable lease cost	776
Sublease income	(83)
Total lease cost	6,969
Cash paid for amounts included in the measurement of operating lease liabilities	$ 5,763
Weighted average remaining lease term - operating leases	166 months
Weighted average discount rate - operating leases	3.96%

Recent Accounting Development_4

Recent Accounting Developments - Future Required Fixed Payments (Details) $ in Thousands	Mar. 31, 2019USD ($)
Accounting Changes and Error Corrections [Abstract]
Remaining in 2019	$ 19,657
2020	22,596
2021	20,860
2022	20,104
2023	18,084
2024	17,167
2025 and thereafter	146,202
Total minimum future amounts	264,670
Impact of measuring the lease liability on a discounted basis	(67,817)
Total lease liability	$ 196,853

Business Combinations and Ass_2

Business Combinations and Asset Acquisitions (Narrative) (Detail) Loan in Thousands, $ in Thousands	Dec. 14, 2018USD ($)	Aug. 01, 2018USD ($)locations	Jan. 04, 2018USD ($)Loan	Mar. 31, 2019USD ($)	Dec. 07, 2018USD ($)
Business Acquisition [Line Items]
Goodwill recorded on acquisition				$ 0
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		$ 26,500
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	$ 37,600
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 ($)	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Available-for-sale securities
Amortized Cost	$ 2,206,853,000	$ 2,185,494,000	$ 1,962,868,000
Gross Unrealized Gains	12,108,000	6,780,000	2,410,000
Gross Unrealized Losses	(33,179,000)	(66,193,000)	(69,590,000)
Fair Value	2,185,782,000	2,126,081,000	1,895,688,000
Held-to-maturity securities
Amortized Cost	1,051,542,000	1,067,439,000	892,937,000
Gross Unrealized Gains	5,614,000	2,241,000	939,000
Gross Unrealized Losses	(15,461,000)	(33,584,000)	(31,349,000)
Fair Value	1,041,695,000	1,036,096,000	862,527,000
Equity securities with readily determinable fair value
Amortized Cost	45,915,000	34,410,000	34,230,000
Gross Unrealized Gains	2,708,000	1,532,000	4,670,000
Gross Unrealized Losses	(970,000)	(1,225,000)	(1,068,000)
Fair Value	47,653,000	34,717,000	37,832,000
U.S. Treasury
Available-for-sale securities
Amortized Cost	126,236,000	126,199,000	25,022,000
Gross Unrealized Gains	579,000	391,000	0
Gross Unrealized Losses	(97,000)	(186,000)	(295,000)
Fair Value	126,718,000	126,404,000	24,727,000
U.S. Government agencies
Available-for-sale securities
Amortized Cost	129,258,000	139,420,000	149,899,000
Gross Unrealized Gains	1,431,000	917,000	0
Gross Unrealized Losses	(2,000)	(30,000)	(563,000)
Fair Value	130,687,000	140,307,000	149,336,000
Held-to-maturity securities
Amortized Cost	806,293,000	814,864,000	639,442,000
Gross Unrealized Gains	1,945,000	1,141,000	0
Gross Unrealized Losses	(14,580,000)	(28,576,000)	(25,891,000)
Fair Value	793,658,000	787,429,000	613,551,000
Municipal
Available-for-sale securities
Amortized Cost	132,870,000	136,831,000	120,396,000
Gross Unrealized Gains	3,701,000	2,427,000	2,218,000
Gross Unrealized Losses	(218,000)	(768,000)	(856,000)
Fair Value	136,353,000	138,490,000	121,758,000
Held-to-maturity securities
Amortized Cost	245,249,000	252,575,000	253,495,000
Gross Unrealized Gains	3,669,000	1,100,000	939,000
Gross Unrealized Losses	(881,000)	(5,008,000)	(5,458,000)
Fair Value	248,037,000	248,667,000	248,976,000
Corporate notes, financial issuers
Available-for-sale securities
Amortized Cost	97,072,000	97,079,000	100,294,000
Gross Unrealized Gains	63,000	35,000	16,000
Gross Unrealized Losses	(4,802,000)	(7,069,000)	(1,595,000)
Fair Value	92,333,000	90,045,000	98,715,000
Corporate notes, other
Available-for-sale securities
Amortized Cost	1,000,000	1,000,000	1,000,000
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	0	0	(1,000)
Fair Value	1,000,000	1,000,000	999,000
Mortgage-backed securities
Available-for-sale securities
Amortized Cost	1,677,903,000	1,641,146,000	1,510,421,000
Gross Unrealized Gains	6,041,000	2,510,000	169,000
Gross Unrealized Losses	(27,662,000)	(57,317,000)	(64,077,000)
Fair Value	1,656,282,000	1,586,339,000	1,446,513,000
Collateralized mortgage obligations
Available-for-sale securities
Amortized Cost	42,514,000	43,819,000	55,836,000
Gross Unrealized Gains	293,000	500,000	7,000
Gross Unrealized Losses	(398,000)	(823,000)	(2,203,000)
Fair Value	42,409,000	43,496,000	53,640,000
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	Mar. 31, 2019USD ($)
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	$ 16,435
Continuous unrealized losses existing for less than 12 months, unrealized losses	(23)
Continuous unrealized losses existing for greater than 12 months, fair value	1,441,224
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(33,156)
Total, fair value	1,457,659
Total, unrealized losses	(33,179)
Held-to-maturity securities
Continuous unrealized losses existing for less than 12 months, fair value	7,951
Continuous unrealized losses existing for less than 12 months, unrealized losses	(111)
Continuous unrealized losses existing for greater than 12 months, fair value	453,392
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(15,350)
Total, fair value	461,343
Total, unrealized losses	(15,461)
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	24,908
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(97)
Total, fair value	24,908
Total, unrealized losses	(97)
U.S. Government agencies
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	208
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(2)
Total, fair value	208
Total, unrealized losses	(2)
Held-to-maturity 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	403,196
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(14,580)
Total, fair value	403,196
Total, unrealized losses	(14,580)
Municipal
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	6,448
Continuous unrealized losses existing for less than 12 months, unrealized losses	(12)
Continuous unrealized losses existing for greater than 12 months, fair value	15,087
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(206)
Total, fair value	21,535
Total, unrealized losses	(218)
Held-to-maturity securities
Continuous unrealized losses existing for less than 12 months, fair value	7,951
Continuous unrealized losses existing for less than 12 months, unrealized losses	(111)
Continuous unrealized losses existing for greater than 12 months, fair value	50,196
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(770)
Total, fair value	58,147
Total, unrealized losses	(881)
Corporate notes, financial issuers
Available-for-sale securities
Continuous unrealized losses existing for less than 12 months, fair value	9,987
Continuous unrealized losses existing for less than 12 months, unrealized losses	(11)
Continuous unrealized losses existing for greater than 12 months, fair value	72,283
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(4,791)
Total, fair value	82,270
Total, unrealized losses	(4,802)
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	0
Continuous unrealized losses existing for less than 12 months, unrealized losses	0
Continuous unrealized losses existing for greater than 12 months, fair value	1,315,030
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(27,662)
Total, fair value	1,315,030
Total, unrealized losses	(27,662)
Collateralized mortgage obligations
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	13,708
Continuous unrealized losses existing for greater than 12 months, unrealized losses	(398)
Total, fair value	13,708
Total, unrealized losses	$ (398)

Investment Securities (Schedule

Investment Securities (Schedule of Realized Gain (Loss)) (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Realized gains on investment securities	$ 17,000	$ 0
Realized losses on investment securities	(84,000)	(975,000)
Net realized losses on investment securities	(67,000)	(975,000)
Unrealized gains on equity securities with readily determinable fair value	1,431,000	1,873,000
Unrealized losses on equity securities with readily determinable fair value	0	(843,000)
Net unrealized gains on equity securities with readily determinable fair value	1,431,000	1,030,000
Upward adjustments of equity securities without readily determinable fair values	0	131,000
Downward adjustments of equity securities without readily determinable fair values	0	0
Impairment of equity securities without readily determinable fair values	0	(537,000)
Adjustment and impairment, net, of equity securities without readily determinable fair values	0	(406,000)
Other than temporary impairment charges	0	0
Gains (losses) on investment securities, net	1,364,000	(351,000)
Proceeds from sales of available-for-sale securities	263,456,000	210,891,000
Proceeds from sales of equity securities with readily determinable fair value	0	0
Proceeds from sales and capital distributions of equity securities without readily determinable fair value	$ 220,000	$ 0

Investment Securities (Investme

Investment Securities (Investments Classified by Contractual Maturity Date) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Available-for-sale securities
Due in one year or less, amortized cost	$ 68,996	$ 82,206	$ 180,899
Due in one to five years, amortized cost	171,058	168,855	90,073
Due in five to ten years, amortized cost	116,901	121,129	116,909
Due after ten years, amortized cost	129,481	128,339	8,730
Without single maturity date, amortized cost	1,720,417	1,684,965	1,566,257
Amortized Cost	2,206,853	2,185,494	1,962,868
Due in one year or less, fair value	69,060	82,153	180,333
Due in one to five years, fair value	172,673	169,307	89,953
Due in five to ten years, fair value	113,825	115,206	116,517
Due after ten years, fair value	131,533	129,580	8,732
Without single maturity date, fair value	1,698,691	1,629,835	1,500,153
Fair Value	2,185,782	2,126,081	1,895,688
Held-to-maturity securities
Held-to-maturity securities, Due in one year or less, amortized cost	9,134	10,009	3,786
Held-to-maturity securities, Due in one to five years, amortized cost	27,477	29,436	34,495
Held-to-maturity securities, Due in five to ten years, amortized cost	301,971	295,897	210,705
Held-to-maturity securities, Due after ten years, amortized cost	712,960	732,097	643,951
Amortized Cost	1,051,542	1,067,439	892,937
Held-to-maturity securities, Due in one year or less, fair value	9,112	9,979	3,775
Held-to-maturity securities, Due in one to five years, fair value	27,539	28,995	33,994
Held-to-maturity securities, Due in five to ten years, fair value	302,066	290,206	205,823
Held-to-maturity securities, Due after ten years, fair value	702,978	706,916	618,935
Fair Value	$ 1,041,695	$ 1,036,096	$ 862,527

Investment Securities (Narrativ

Investment Securities (Narrative) (Detail)	3 Months Ended
	Mar. 31, 2019USD ($)security	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)
Investments, Debt and Equity Securities [Abstract]
Equity securities with readily determinable fair value	$ 27,000,000
Upward adjustments of equity securities without readily determinable fair values	0	$ 131,000
Downward adjustments of equity securities without readily determinable fair values	0	0
Impairment of equity securities without readily determinable fair values	0	537,000
Pledged securities	$ 1,700,000,000	$ 1,500,000,000	$ 1,700,000,000
Number of securities by a single non-government sponsored issuer exceeding 10% of shareholders' equity | security	0

Loans (Summary of Loan Portfoli

Loans (Summary of Loan Portfolio) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Loans [Line Items]
Total loans, net of unearned income	$ 24,214,629	$ 23,820,691	$ 22,062,134
Total loans, net of unearned income, percentage	100.00%	100.00%	100.00%
Commercial
Loans [Line Items]
Total loans, net of unearned income	$ 7,994,191	$ 7,828,538	$ 7,060,871
Total loans, net of unearned income, percentage	33.00%	33.00%	32.00%
Commercial real estate
Loans [Line Items]
Total loans, net of unearned income	$ 6,973,505	$ 6,933,252	$ 6,633,520
Total loans, net of unearned income, percentage	29.00%	29.00%	30.00%
Home equity
Loans [Line Items]
Total loans, net of unearned income	$ 528,448	$ 552,343	$ 626,547
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	$ 1,053,524	$ 1,002,464	$ 869,104
Total loans, net of unearned income, percentage	4.00%	4.00%	4.00%
Premium finance receivables | Commercial
Loans [Line Items]
Total loans, net of unearned income	$ 2,988,788	$ 2,841,659	$ 2,576,150
Total loans, net of unearned income, percentage	12.00%	12.00%	12.00%
Premium finance receivables | Life insurance
Loans [Line Items]
Total loans, net of unearned income	$ 4,555,369	$ 4,541,794	$ 4,189,961
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	$ 120,804	$ 120,641	$ 105,981
Total loans, net of unearned income, percentage	1.00%	1.00%	0.00%

Loans (Schedule of Unpaid Princ

Loans (Schedule of Unpaid Principal Balance And Carrying Value Of Acquired Loans) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Abstract]
Unpaid Principal Balance	$ 334,654	$ 341,555
Carrying Value	$ 313,221	$ 318,394

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
	Mar. 31, 2019	Mar. 31, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretable yield, beginning balance	$ 34,876	$ 36,565
Acquisitions	0	0
Accretable yield amortized to interest income	(3,829)	(4,619)
Reclassification from non-accretable difference	1,574	1,556
Increases in interest cash flows due to payments and changes in interest rates	1,471	2,190
Accretable yield, ending balance	$ 34,092	$ 35,692

Loans (Narrative) (Detail)

Loans (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 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	$ 6,400	$ 9,400	$ 4,500
Accretable yield amortized to interest income	(3,829)	(4,619)
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	$ 110,000	$ 85,400	$ 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	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 110,612	$ 105,326	$ 80,936
90+ days and still accruing	15,251	18,872	14,216
Current	23,893,423	23,526,168	21,794,020
Loans, net of unearned income, excluding covered loans	24,214,629	23,820,691	22,062,134
60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	19,181	34,176	17,952
30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	176,162	136,149	155,010
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	55,792	50,984	14,007
90+ days and still accruing	2,499	3,313	856
Current	7,884,413	7,737,729	6,991,004
Loans, net of unearned income, excluding covered loans	7,994,191	7,828,538	7,060,871
Commercial | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,787	1,651	771
Commercial | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	49,700	34,861	54,233
Commercial | Commercial, industrial and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	38,858	34,298	10,051
90+ days and still accruing	0	0	0
Current	5,172,214	5,062,729	4,518,760
Loans, net of unearned income, excluding covered loans	5,250,953	5,120,096	4,560,880
Commercial | Commercial, industrial and other | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,787	1,451	594
Commercial | Commercial, industrial and other | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	38,094	21,618	31,475
Commercial | Franchise
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	15,799	16,051	2,401
90+ days and still accruing	0	0	0
Current	863,573	924,190	931,710
Loans, net of unearned income, excluding covered loans	879,906	948,979	935,358
Commercial | Franchise | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0	44
Commercial | Franchise | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	534	8,738	1,203
Commercial | Mortgage warehouse lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	0	0
90+ days and still accruing	0	0	0
Current	174,284	144,199	157,699
Loans, net of unearned income, excluding covered loans	174,284	144,199	163,470
Commercial | Mortgage warehouse lines of credit | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0	0
Commercial | Mortgage warehouse lines of credit | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0	5,771
Commercial | Asset-based lending
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,135	635	1,194
90+ days and still accruing	0	0	0
Current	1,031,878	1,022,065	963,883
Loans, net of unearned income, excluding covered loans	1,040,834	1,026,056	977,735
Commercial | Asset-based lending | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	200	47
Commercial | Asset-based lending | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	7,821	3,156	12,611
Commercial | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	0	361
90+ days and still accruing	0	0	0
Current	620,088	564,430	410,667
Loans, net of unearned income, excluding covered loans	622,884	565,680	414,198
Commercial | Leases | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0	0
Commercial | Leases | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,796	1,250	3,170
Commercial | PCI - commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	0	0
90+ days and still accruing	2,499	3,313	856
Current	22,376	20,116	8,285
Loans, net of unearned income, excluding covered loans	25,330	23,528	9,230
Commercial | PCI - commercial | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0	86
Commercial | PCI - commercial | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	455	99	3
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	15,933	19,129	21,825
90+ days and still accruing	4,265	6,241	3,107
Current	6,892,823	6,845,490	6,546,556
Loans, net of unearned income, excluding covered loans	6,973,505	6,933,252	6,633,520
Commercial real estate | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	5,612	10,826	3,563
Commercial real estate | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	54,872	51,566	58,469
Commercial real estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,030	1,554	3,139
90+ days and still accruing	0	0	0
Current	798,266	749,846	802,921
Loans, net of unearned income, excluding covered loans	803,669	760,824	815,636
Commercial real estate | Construction | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	496	0	0
Commercial real estate | Construction | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,877	9,424	9,576
Commercial real estate | Land
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	54	107	182
90+ days and still accruing	0	0	0
Current	143,759	141,097	117,981
Loans, net of unearned income, excluding covered loans	147,701	141,481	122,690
Commercial real estate | Land | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	170	0
Commercial real estate | Land | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,888	107	4,527
Commercial real estate | Office
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	4,482	3,629	474
90+ days and still accruing	0	0	0
Current	918,529	929,739	878,206
Loans, net of unearned income, excluding covered loans	926,375	939,322	891,071
Commercial real estate | Office | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	877	925
Commercial real estate | Office | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,364	5,077	11,466
Commercial real estate | Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	267	285	1,427
90+ days and still accruing	0	0	0
Current	953,011	885,367	898,867
Loans, net of unearned income, excluding covered loans	964,960	902,248	906,144
Commercial real estate | Industrial | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,039	0	823
Commercial real estate | Industrial | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	10,643	16,596	5,027
Commercial real estate | Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	7,645	10,753	12,274
90+ days and still accruing	0	0	0
Current	879,473	878,106	878,563
Loans, net of unearned income, excluding covered loans	895,267	892,478	895,622
Commercial real estate | Retail | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	1,890	0
Commercial real estate | Retail | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	8,149	1,729	4,785
Commercial real estate | Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	303	311	19
90+ days and still accruing	0	0	0
Current	1,116,220	970,597	931,008
Loans, net of unearned income, excluding covered loans	1,117,385	976,560	931,355
Commercial real estate | Multi-family | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	187	77	0
Commercial real estate | Multi-family | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	675	5,575	328
Commercial real estate | Mixed use and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,152	2,490	4,310
90+ days and still accruing	0	0	0
Current	1,987,008	2,192,105	1,937,328
Loans, net of unearned income, excluding covered loans	2,007,487	2,205,195	1,955,456
Commercial real estate | Mixed use and other | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,084	1,617	192
Commercial real estate | Mixed use and other | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	17,243	8,983	13,626
Commercial real estate | PCI - commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	0	0
90+ days and still accruing	4,265	6,241	3,107
Current	96,557	98,633	101,682
Loans, net of unearned income, excluding covered loans	110,661	115,144	115,546
Commercial real estate | PCI - commercial real estate | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,806	6,195	1,623
Commercial real estate | PCI - commercial real estate | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	7,033	4,075	9,134
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	7,885	7,147	9,828
90+ days and still accruing	0	0	0
Current	515,438	541,960	611,181
Loans, net of unearned income, excluding covered loans	528,448	552,343	626,547
Home equity | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	810	131	1,505
Home equity | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	4,315	3,105	4,033
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	15,879	16,383	17,214
90+ days and still accruing	1,481	1,292	1,437
Current	1,024,543	976,926	841,416
Loans, net of unearned income, excluding covered loans	1,053,524	1,002,464	869,104
Residential real estate | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	509	1,692	229
Residential real estate | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	11,112	6,171	8,808
Premium finance receivables | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	14,797	11,335	17,342
90+ days and still accruing	6,558	7,799	8,547
Current	2,941,038	2,796,058	2,525,962
Loans, net of unearned income, excluding covered loans	2,988,788	2,841,659	2,576,150
Premium finance receivables | Commercial | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	5,628	11,382	6,543
Premium finance receivables | Commercial | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	20,767	15,085	17,756
Premium finance receivables | Life insurance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	0	0
90+ days and still accruing	168	0	0
Current	4,349,597	4,340,856	3,986,181
Loans, net of unearned income, excluding covered loans	4,389,599	4,373,891	4,002,726
Premium finance receivables | Life insurance loans | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	4,788	8,407	5,125
Premium finance receivables | Life insurance loans | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	35,046	24,628	11,420
Premium finance receivables | PCI - life insurance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	0	0	0
90+ days and still accruing	0	0	0
Current	165,770	167,903	187,235
Loans, net of unearned income, excluding covered loans	165,770	167,903	187,235
Premium finance receivables | PCI - life insurance loans | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0	0
Premium finance receivables | PCI - life insurance loans | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0	0
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	326	348	720
90+ days and still accruing	280	227	269
Current	119,801	119,246	104,485
Loans, net of unearned income, excluding covered loans	120,804	120,641	105,981
Consumer and other | 60-89 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	47	87	216
Consumer and other | 30-59 days past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 350	$ 733	$ 291

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	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	$ 24,214,629	$ 23,820,691	$ 22,062,134
Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	7,994,191	7,828,538	7,060,871
Commercial | Commercial, industrial and other
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	5,250,953	5,120,096	4,560,880
Commercial | Franchise
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	879,906	948,979	935,358
Commercial | Mortgage warehouse lines of credit
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	174,284	144,199	163,470
Commercial | Asset-based lending
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,040,834	1,026,056	977,735
Commercial | Leases
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	622,884	565,680	414,198
Commercial | PCI - commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	25,330	23,528	9,230
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	6,973,505	6,933,252	6,633,520
Commercial real estate | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	803,669	760,824	815,636
Commercial real estate | Land
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	147,701	141,481	122,690
Commercial real estate | Office
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	926,375	939,322	891,071
Commercial real estate | Industrial
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	964,960	902,248	906,144
Commercial real estate | Retail
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	895,267	892,478	895,622
Commercial real estate | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,117,385	976,560	931,355
Commercial real estate | Mixed use and other
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	2,007,487	2,205,195	1,955,456
Commercial real estate | PCI - commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	110,661	115,144	115,546
Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	528,448	552,343	626,547
Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,053,524	1,002,464	869,104
Premium finance receivables | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	2,988,788	2,841,659	2,576,150
Premium finance receivables | Life insurance loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	4,389,599	4,373,891	4,002,726
Premium finance receivables | PCI - life insurance loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	165,770	167,903	187,235
Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	120,804	120,641	105,981
Performing
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	24,097,043	23,707,457	21,972,444
Performing | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	7,938,399	7,777,554	7,046,864
Performing | Commercial | Commercial, industrial and other
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	5,212,095	5,085,798	4,550,829
Performing | Commercial | Franchise
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	864,107	932,928	932,957
Performing | Commercial | Mortgage warehouse lines of credit
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	174,284	144,199	163,470
Performing | Commercial | Asset-based lending
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,039,699	1,025,421	976,541
Performing | Commercial | Leases
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	622,884	565,680	413,837
Performing | Commercial | PCI - commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	25,330	23,528	9,230
Performing | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	6,957,572	6,914,123	6,611,695
Performing | Commercial real estate | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	802,639	759,270	812,497
Performing | Commercial real estate | Land
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	147,647	141,374	122,508
Performing | Commercial real estate | Office
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	921,893	935,693	890,597
Performing | Commercial real estate | Industrial
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	964,693	901,963	904,717
Performing | Commercial real estate | Retail
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	887,622	881,725	883,348
Performing | Commercial real estate | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,117,082	976,249	931,336
Performing | Commercial real estate | Mixed use and other
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	2,005,335	2,202,705	1,951,146
Performing | Commercial real estate | PCI - commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	110,661	115,144	115,546
Performing | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	520,563	545,196	616,719
Performing | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,037,615	986,081	851,890
Performing | Premium finance receivables | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	2,967,433	2,822,525	2,550,261
Performing | Premium finance receivables | Life insurance loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	4,389,431	4,373,891	4,002,726
Performing | Premium finance receivables | PCI - life insurance loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	165,770	167,903	187,235
Performing | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	120,260	120,184	105,054
Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	117,586	113,234	89,690
Non-performing | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	55,792	50,984	14,007
Non-performing | Commercial | Commercial, industrial and other
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	38,858	34,298	10,051
Non-performing | Commercial | Franchise
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	15,799	16,051	2,401
Non-performing | Commercial | Mortgage warehouse lines of credit
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	0	0	0
Non-performing | Commercial | Asset-based lending
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,135	635	1,194
Non-performing | Commercial | Leases
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	0	0	361
Non-performing | Commercial | PCI - commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	0	0	0
Non-performing | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	15,933	19,129	21,825
Non-performing | Commercial real estate | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	1,030	1,554	3,139
Non-performing | Commercial real estate | Land
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	54	107	182
Non-performing | Commercial real estate | Office
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	4,482	3,629	474
Non-performing | Commercial real estate | Industrial
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	267	285	1,427
Non-performing | Commercial real estate | Retail
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	7,645	10,753	12,274
Non-performing | Commercial real estate | Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	303	311	19
Non-performing | Commercial real estate | Mixed use and other
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	2,152	2,490	4,310
Non-performing | Commercial real estate | PCI - commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	0	0	0
Non-performing | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	7,885	7,147	9,828
Non-performing | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	15,909	16,383	17,214
Non-performing | Premium finance receivables | Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	21,355	19,134	25,889
Non-performing | Premium finance receivables | Life insurance loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	168	0	0
Non-performing | Premium finance receivables | PCI - life insurance loans
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	0	0	0
Non-performing | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans, net of unearned income	$ 544	$ 457	$ 927

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
	Mar. 31, 2019	Mar. 31, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses at beginning of period	$ 152,770	$ 137,905
Other adjustments	(27)	(40)
Reclassification from allowance for unfunded lending-related commitments	(16)	26
Charge-offs	(6,640)	(9,278)
Recoveries	1,501	2,544
Provision for credit losses	10,624	8,346
Allowance for loan losses at period end	158,212	139,503
Allowance for unfunded lending-related commitments at period end	1,410	1,243
Allowance for credit losses at period end	159,622	140,746
Individually evaluated for impairment	13,606	6,877
Collectively evaluated for impairment	145,372	133,194
Loans at period end, Individually evaluated for impairment	144,361	103,455
Loans at period end, Collectively evaluated for impairment	23,655,976	21,564,972
Loans held at fair value	101,071	67,962
Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses at period end	644	675
Loans at period end, Loans acquired with deteriorated credit quality	313,221	325,745
Commercial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses at beginning of period	67,826	57,811
Other adjustments	0	(1)
Reclassification from allowance for unfunded lending-related commitments	0	0
Charge-offs	(503)	(2,687)
Recoveries	318	262
Provision for credit losses	6,997	2,251
Allowance for loan losses at period end	74,638	57,636
Allowance for unfunded lending-related commitments at period end	0	0
Allowance for credit losses at period end	74,638	57,636
Individually evaluated for impairment	11,858	2,344
Collectively evaluated for impairment	62,317	54,789
Loans at period end, Individually evaluated for impairment	75,442	33,810
Loans at period end, Collectively evaluated for impairment	7,893,419	7,017,831
Loans held at fair value	0	0
Commercial | Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses at period end	463	503
Loans at period end, Loans acquired with deteriorated credit quality	25,330	9,230
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses at beginning of period	60,267	55,227
Other adjustments	(24)	(24)
Reclassification from allowance for unfunded lending-related commitments	(16)	26
Charge-offs	(3,734)	(813)
Recoveries	480	1,687
Provision for credit losses	877	1,378
Allowance for loan losses at period end	57,850	57,481
Allowance for unfunded lending-related commitments at period end	1,410	1,243
Allowance for credit losses at period end	59,260	58,724
Individually evaluated for impairment	517	3,611
Collectively evaluated for impairment	58,623	55,042
Loans at period end, Individually evaluated for impairment	30,300	38,237
Loans at period end, Collectively evaluated for impairment	6,832,544	6,479,737
Loans held at fair value	0	0
Commercial real estate | Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses at period end	120	71
Loans at period end, Loans acquired with deteriorated credit quality	110,661	115,546
Home equity
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses at beginning of period	8,507	10,493
Other adjustments	(7)	0
Reclassification from allowance for unfunded lending-related commitments	0	0
Charge-offs	(88)	(357)
Recoveries	62	123
Provision for credit losses	153	(399)
Allowance for loan losses at period end	8,627	9,860
Allowance for unfunded lending-related commitments at period end	0	0
Allowance for credit losses at period end	8,627	9,860
Individually evaluated for impairment	796	749
Collectively evaluated for impairment	7,831	9,111
Loans at period end, Individually evaluated for impairment	15,779	10,102
Loans at period end, Collectively evaluated for impairment	512,669	616,445
Loans held at fair value	0	0
Home equity | Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses at period end	0	0
Loans at period end, Loans acquired with deteriorated credit quality	0	0
Residential real estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses at beginning of period	7,194	6,688
Other adjustments	(7)	(3)
Reclassification from allowance for unfunded lending-related commitments	0	0
Charge-offs	(3)	(571)
Recoveries	29	40
Provision for credit losses	417	124
Allowance for loan losses at period end	7,630	6,278
Allowance for unfunded lending-related commitments at period end	0	0
Allowance for credit losses at period end	7,630	6,278
Individually evaluated for impairment	302	148
Collectively evaluated for impairment	7,267	6,029
Loans at period end, Individually evaluated for impairment	22,464	20,558
Loans at period end, Collectively evaluated for impairment	921,204	768,859
Loans held at fair value	101,071	67,962
Residential real estate | Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses at period end	61	101
Loans at period end, Loans acquired with deteriorated credit quality	8,785	11,725
Premium finance receivables
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses at beginning of period	7,715	6,846
Other adjustments	11	(12)
Reclassification from allowance for unfunded lending-related commitments	0	0
Charge-offs	(2,210)	(4,721)
Recoveries	556	385
Provision for credit losses	2,147	4,835
Allowance for loan losses at period end	8,219	7,333
Allowance for unfunded lending-related commitments at period end	0	0
Allowance for credit losses at period end	8,219	7,333
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	8,219	7,333
Loans at period end, Individually evaluated for impairment	0	0
Loans at period end, Collectively evaluated for impairment	7,378,387	6,578,876
Loans held at fair value	0	0
Premium finance receivables | Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses at period end	0	0
Loans at period end, Loans acquired with deteriorated credit quality	165,770	187,235
Consumer and other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for loan losses at beginning of period	1,261	840
Other adjustments	0	0
Reclassification from allowance for unfunded lending-related commitments	0	0
Charge-offs	(102)	(129)
Recoveries	56	47
Provision for credit losses	33	157
Allowance for loan losses at period end	1,248	915
Allowance for unfunded lending-related commitments at period end	0	0
Allowance for credit losses at period end	1,248	915
Individually evaluated for impairment	133	25
Collectively evaluated for impairment	1,115	890
Loans at period end, Individually evaluated for impairment	376	748
Loans at period end, Collectively evaluated for impairment	117,753	103,224
Loans held at fair value	0	0
Consumer and other | Loans acquired with deteriorated credit quality
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Allowance for credit losses at period end	0	0
Loans at period end, Loans acquired with deteriorated credit quality	$ 2,675	$ 2,009

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	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance for loan loss required	$ 72,539	$ 60,219	$ 37,572
Impaired loans with no allowance for loan loss required	71,579	67,050	65,559
Total impaired loans	144,118	127,269	103,131
Allowance for loan losses related to impaired loans	13,599	11,437	6,863
Financing Receivable
Financing Receivable, Impaired [Line Items]
Allowance for loan losses related to impaired loans	6,700
TDRs	$ 88,362	$ 66,102	$ 47,676

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	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	$ 72,539	$ 37,572	$ 60,219
Impaired Financing Receivable, Related Allowance	13,599	6,863	11,437
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	71,579	65,559	67,050
Total impaired loans	144,118	103,131	127,269
Impaired Financing Receivable, Unpaid Principal Balance	159,383	116,304	139,246
Impaired Financing Receivable, Average Recorded Investment	147,492	103,951	133,481
Impaired Financing Receivable, Interest Income Recognized	2,308	1,446	7,347
Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment		0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		0
Impaired Financing Receivable, Related Allowance		0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized		0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		18,657
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		18,661
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		18,675
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized		239
Commercial | Commercial, industrial and other
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	33,360	5,521	16,703
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	33,623	5,587	17,029
Impaired Financing Receivable, Related Allowance	6,919	1,738	4,866
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	33,641	5,607	17,868
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	656	83	1,181
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	17,411	5,480	18,314
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	20,125	6,777	21,501
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	17,481	5,650	20,547
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	316	109	1,143
Commercial | Franchise
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	15,776		16,021
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	16,256		16,256
Impaired Financing Receivable, Related Allowance	4,702		1,375
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	15,855		16,221
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	243		909
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,145		5,152
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	5,147		5,154
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	5,147		5,320
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	101		403
Commercial | Asset-based lending
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	331	1,107	557
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	331	1,107	557
Impaired Financing Receivable, Related Allowance	237	475	317
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	335	1,166	689
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	7	20	50
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	934	86	207
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	1,332	231	601
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,120	182	569
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	24	3	51
Commercial | Leases
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,691	2,213	1,730
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,691	2,221	1,730
Impaired Financing Receivable, Related Allowance	0	131	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,701	2,247	1,812
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	21	27	91
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	794	746	845
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	831	746	879
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	810	754	936
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	13	11	56
Commercial real estate | Construction
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	3,097	1,554
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0	3,897	1,554
Impaired Financing Receivable, Related Allowance	0	599	550
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	3,097	1,554
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	0	50	76
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,146	1,363	1,117
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,671	1,364	1,117
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,496	1,364	1,218
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	33	15	52
Commercial real estate | Land
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	45	1,500	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	45	1,500	0
Impaired Financing Receivable, Related Allowance	9	3	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	45	1,567	0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	1	17	0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,285	2,329	3,396
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	3,380	2,434	3,491
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,301	2,339	3,751
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	47	31	198
Commercial real estate | Office
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	3,055	1,479	573
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	3,120	2,078	638
Impaired Financing Receivable, Related Allowance	149	73	21
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	3,070	1,483	587
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	35	24	25
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	1,991	59	3,629
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	2,006	754	3,642
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,993	61	3,651
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	29	11	184
Commercial real estate | Industrial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	63	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0	172	0
Impaired Financing Receivable, Related Allowance	0	1	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	63	0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	0	2	0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	295	1,427	322
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	432	1,485	450
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	304	1,430	363
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	7	20	30
Commercial real estate | Retail
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	5,114	15,347	14,633
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	5,114	15,415	14,633
Impaired Financing Receivable, Related Allowance	41	2,512	3,413
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,116	15,315	14,694
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	51	166	676
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	8,059	2,695	1,592
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	11,405	2,992	1,945
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	10,198	2,710	1,699
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	150	58	110
Commercial real estate | Multi-family
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,185	1,234	0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,185	1,277	0
Impaired Financing Receivable, Related Allowance	30	21	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,185	1,254	0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	12	12	0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	303	0	1,498
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	403	84	1,595
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	306	0	1,529
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	3	1	55
Commercial real estate | Mixed use and other
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	1,082	2,036	1,188
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	1,118	2,281	1,221
Impaired Financing Receivable, Related Allowance	281	388	293
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,085	2,054	1,354
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	13	30	66
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,496	5,284	3,522
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	3,812	5,981	3,836
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,528	5,340	3,611
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	58	80	227
Home equity
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	6,316	1,697	3,133
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	6,694	1,889	3,470
Impaired Financing Receivable, Related Allowance	796	749	282
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,335	1,699	3,165
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	60	19	131
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	9,463	8,405	9,122
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	12,658	12,535	12,383
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	9,560	8,255	9,323
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	155	151	564
Residential real estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	4,390	2,253	4,011
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	4,664	2,956	4,263
Impaired Financing Receivable, Related Allowance	302	148	204
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	4,403	2,258	4,056
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	42	33	159
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	18,075	18,305	18,053
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	20,823	20,983	20,765
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	18,098	18,630	18,552
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	225	222	883
Consumer and other
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	194	25	116
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	241	27	129
Impaired Financing Receivable, Related Allowance	133	25	116
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	195	25	119
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized	3	0	7
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	182	723	281
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	276	870	407
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	184	726	293
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized	$ 3	$ 12	$ 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) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019USD ($)contracts	Mar. 31, 2018USD ($)contracts	Mar. 31, 2019USD ($)Loan	Mar. 31, 2018USD ($)Loan
Financing Receivable, Modifications [Line Items]
TDRs, number	30	7	94	24
TDRs, Additions	$ 23,718	$ 990	$ 51,969	$ 23,802
Extension at Below Market Terms
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	22	7
TDRs, Additions	$ 4,994	$ 990
Reduction of Interest Rate
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	6	2
TDRs, Additions	$ 1,547	$ 111
Modification to Interest Only Payments
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	8	0
TDRs, Additions	$ 18,724	$ 0
Forgiveness of Debt
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	0	0
TDRs, Additions	$ 0	$ 0
Residential real estate and other
Financing Receivable, Modifications [Line Items]
TDRs, number	20	5	74	15
TDRs, Additions	$ 4,486	$ 835	$ 13,411	$ 3,711
Residential real estate and other | Extension at Below Market Terms
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	20	5
TDRs, Additions	$ 4,486	$ 835
Residential real estate and other | Reduction of Interest Rate
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	6	2
TDRs, Additions	$ 1,547	$ 111
Residential real estate and other | Modification to Interest Only Payments
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	0	0
TDRs, Additions	$ 0	$ 0
Residential real estate and other | Forgiveness of Debt
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	0	0
TDRs, Additions	$ 0	$ 0
Commercial, industrial and other | Commercial
Financing Receivable, Modifications [Line Items]
TDRs, number	8	1	11	5
TDRs, Additions	$ 18,854	$ 96	$ 32,199	$ 3,776
Commercial, industrial and other | Commercial | Extension at Below Market Terms
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	1	1
TDRs, Additions	$ 432	$ 96
Commercial, industrial and other | Commercial | Reduction of Interest Rate
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	0	0
TDRs, Additions	$ 0	$ 0
Commercial, industrial and other | Commercial | Modification to Interest Only Payments
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	7	0
TDRs, Additions	$ 18,422	$ 0
Commercial, industrial and other | Commercial | Forgiveness of Debt
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	0	0
TDRs, Additions	$ 0	$ 0
Asset-based lending | Commercial
Financing Receivable, Modifications [Line Items]
TDRs, number	1		2	0
TDRs, Additions	$ 76		$ 206	$ 0
Asset-based lending | Commercial | Extension at Below Market Terms
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	1
TDRs, Additions	$ 76
Asset-based lending | Commercial | Reduction of Interest Rate
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	0
TDRs, Additions	$ 0
Asset-based lending | Commercial | Modification to Interest Only Payments
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	0
TDRs, Additions	$ 0
Asset-based lending | Commercial | Forgiveness of Debt
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	0
TDRs, Additions	$ 0
Office | Commercial real estate
Financing Receivable, Modifications [Line Items]
TDRs, number		1	0	1
TDRs, Additions		$ 59	$ 0	$ 59
Office | Commercial real estate | Extension at Below Market Terms
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts		1
TDRs, Additions		$ 59
Office | Commercial real estate | Reduction of Interest Rate
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts		0
TDRs, Additions		$ 0
Office | Commercial real estate | Modification to Interest Only Payments
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts		0
TDRs, Additions		$ 0
Office | Commercial real estate | Forgiveness of Debt
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts		0
TDRs, Additions		$ 0
Mixed use and other | Commercial real estate
Financing Receivable, Modifications [Line Items]
TDRs, number	1	0	3	0
TDRs, Additions	$ 302	$ 0	$ 757	$ 0
Mixed use and other | Commercial real estate | Extension at Below Market Terms
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	0	0
TDRs, Additions	$ 0	$ 0
Mixed use and other | Commercial real estate | Reduction of Interest Rate
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	0	0
TDRs, Additions	$ 0	$ 0
Mixed use and other | Commercial real estate | Modification to Interest Only Payments
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	1	0
TDRs, Additions	$ 302	$ 0
Mixed use and other | Commercial real estate | Forgiveness of Debt
Financing Receivable, Modifications [Line Items]
TDRs, number | contracts	0	0
TDRs, Additions	$ 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		12 Months Ended
	Mar. 31, 2019USD ($)Loancontracts	Mar. 31, 2018USD ($)Loancontracts	Mar. 31, 2019USD ($)Loan	Mar. 31, 2018USD ($)Loan
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Total, Count	30	7	94	24
Total, Balance	$ 23,718	$ 990	$ 51,969	$ 23,802
Payments in Default, Count | Loan	15	10
Payments in Default, Balance	$ 2,799	$ 6,327
Commercial | Commercial, industrial and other
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Total, Count	8	1	11	5
Total, Balance	$ 18,854	$ 96	$ 32,199	$ 3,776
Payments in Default, Count | Loan	1	5
Payments in Default, Balance	$ 77	$ 3,776
Commercial | Franchise
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Total, Count | Loan			3	0
Total, Balance			$ 5,157	$ 0
Payments in Default, Count | Loan	0	0
Payments in Default, Balance	$ 0	$ 0
Commercial | Asset-based lending
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Total, Count	1		2	0
Total, Balance	$ 76		$ 206	$ 0
Payments in Default, Count | Loan	2	0
Payments in Default, Balance	$ 206	$ 0
Commercial | Leases
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Total, Count | Loan			1	3
Total, Balance			$ 239	$ 16,256
Payments in Default, Count | Loan	0	0
Payments in Default, Balance	$ 0	$ 0
Commercial real estate | Office
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Total, Count		1	0	1
Total, Balance		$ 59	$ 0	$ 59
Payments in Default, Count | Loan	0	0
Payments in Default, Balance	$ 0	$ 0
Commercial real estate | Mixed use and other
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Total, Count	1	0	3	0
Total, Balance	$ 302	$ 0	$ 757	$ 0
Payments in Default, Count | Loan	3	0
Payments in Default, Balance	$ 757	$ 0
Residential real estate and other
Troubled Debt Restructuring, Debtor, Subsequent Periods [Line Items]
Total, Count	20	5	74	15
Total, Balance	$ 4,486	$ 835	$ 13,411	$ 3,711
Payments in Default, Count | Loan	9	5
Payments in Default, Balance	$ 1,759	$ 2,551

Allowance for Loan Losses, A_10

Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Narrative) (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2019USD ($)contracts	Mar. 31, 2018USD ($)contracts	Mar. 31, 2019USD ($)Loan	Mar. 31, 2018USD ($)Loan	Dec. 31, 2018USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
TDRs, number	30	7	94	24
Allowance for loan losses related to impaired loans	$ 13,599,000	$ 6,863,000	$ 13,599,000	$ 6,863,000	$ 11,437,000
TDRs, Additions	$ 23,718,000	$ 990,000	51,969,000	23,802,000
Weighted average extension term	12 months	74 months
Interest-only payment terms	3 months
Weighted average stated interest rate, basis points	2.11%	2.87%
Loan forgiveness	$ 0	$ 0
Financing Receivable
Financing Receivable, Allowance for Credit Losses [Line Items]
TDRs	$ 88,362,000	47,676,000	88,362,000	47,676,000	$ 66,102,000
TDRs, number | contracts	163
Allowance for loan losses related to impaired loans	$ 6,700,000		6,700,000
Interest income, passage of time	34,000	21,000
Residential Real Estate | Financing Receivable
Financing Receivable, Allowance for Credit Losses [Line Items]
Foreclosed residential properties	4,200,000		4,200,000
In process other real estate owned	$ 14,200,000	$ 11,400,000	$ 14,200,000	$ 11,400,000

Goodwill And Other Intangible_3

Goodwill And Other Intangible Assets (Goodwill Assets by Business Segment) (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 573,141
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	517
Ending balance	573,658
Community banking
Goodwill [Roll Forward]
Beginning balance	465,085
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	37
Ending balance	465,122
Specialty finance
Goodwill [Roll Forward]
Beginning balance	38,343
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	480
Ending balance	38,823
Wealth management
Goodwill [Roll Forward]
Beginning balance	69,713
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	0
Ending balance	$ 69,713

Goodwill And Other Intangible_4

Goodwill And Other Intangible Assets (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Indefinite-lived Intangible Assets [Line Items]
Goodwill increase for foreign currency translation adjustments	$ 480
Amortization of other intangible assets	2,942	$ 1,004
Community banking
Indefinite-lived Intangible Assets [Line Items]
Goodwill increase for purchase accounting adjustments	$ 37
Community banking | Core deposit intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets	10 years
Specialty finance | Customer list intangibles
Indefinite-lived Intangible Assets [Line Items]
Amortization period in years, other intangible assets	18 years
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	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Intangibles with finite lives
Accumulated amortization	$ (37,072)	$ (34,130)	$ (30,566)
Intangibles with indefinite lives
Gross carrying amount	83,638	83,554	52,979
Total net carrying amount	46,566	49,424	22,413
Community banking
Intangibles with indefinite lives
Carrying amount	30,225	31,760	16,792
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	55,447	55,366	37,272
Accumulated amortization	(31,022)	(29,406)	(26,280)
Net carrying amount	24,425	25,960	10,992
Customer list intangibles | Specialty finance
Intangibles with finite lives
Gross carrying amount	1,961	1,958	1,967
Accumulated amortization	(1,468)	(1,436)	(1,335)
Net carrying amount	493	522	632
Customer list and other intangibles | Wealth management
Intangibles with finite lives
Gross carrying amount	20,430	20,430	7,940
Accumulated amortization	(4,582)	(3,288)	(2,951)
Net carrying amount	$ 15,848	$ 17,142	$ 4,989

Goodwill And Other Intangible_6

Goodwill And Other Intangible Assets (Estimated Amortization) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Actual in three months ended March 31, 2019	$ 2,942	$ 1,004
Estimated remaining in 2019	8,414
Estimated—2020	9,595
Estimated—2021	6,385
Estimated—2022	4,957
Estimated—2023	$ 3,630

Mortgage Servicing Rights ("M_3

Mortgage Servicing Rights ("MSRs") (Schedule Of Changes In Carrying Value Of MSR) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of the period	$ 75,183	$ 33,676
Additions from loans sold with servicing retained	6,580	4,159
Additions from acquisitions	0	13,806
Estimate of changes in fair value due to:
Payoffs and paydowns	(1,997)	(1,202)
Changes in valuation inputs or assumptions	(8,744)	4,133
Fair value at end of the period	71,022	54,572
Unpaid principal balance of mortgage loans serviced for others	$ 7,014,269	$ 4,795,335

Deposits (Summary of Deposits)

Deposits (Summary of Deposits) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Balance:
Non-interest bearing	$ 6,353,456	$ 6,569,880	$ 6,612,319
NOW and interest bearing demand deposits	2,948,576	2,897,133	2,315,122
Wealth management deposits	3,328,781	2,996,764	2,495,134
Money market	6,093,596	5,704,866	4,617,122
Savings	2,729,626	2,665,194	2,901,504
Time certificates of deposit	5,350,707	5,260,841	4,338,126
Total deposits	$ 26,804,742	$ 26,094,678	$ 23,279,327
Mix:
Non-interest bearing	24.00%	25.00%	28.00%
NOW and interest bearing demand deposits	11.00%	11.00%	10.00%
Wealth management deposits	12.00%	12.00%	11.00%
Money market	23.00%	22.00%	20.00%
Savings	10.00%	10.00%	12.00%
Time certificates of deposit	20.00%	20.00%	19.00%
Total deposits	100.00%	100.00%	100.00%

FHLB Advances, Other Borrowin_2

FHLB Advances, Other Borrowings and Subordinated Notes (Summary of Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Sep. 18, 2018	Mar. 31, 2018	Dec. 15, 2014
Debt Disclosure [Abstract]
FHLB advances	$ 576,353	$ 426,326		$ 915,000
Other borrowings:
Notes payable	139,119	144,461	$ 150,000	33,727	$ 150,000
Short-term borrowings	16,212	50,593		17,977
Other	47,394	47,722		48,742
Secured borrowings	169,469	151,079		146,646
Total other borrowings	372,194	393,855		247,092
Subordinated notes	139,235	139,210		139,111
Total FHLB advances, other borrowings and subordinated notes	$ 1,087,782	$ 959,391		$ 1,301,203

FHLB Advances, Other Borrowin_3

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	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged financial instruments	$ 53,300
Securities sold under agreements to repurchase	16,200	$ 50,600	$ 18,000
Overnight Sweep Collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged financial instruments	53,342
Excess collateral	37,130
Securities sold under agreements to repurchase	16,212
Overnight Sweep Collateral | Available-for-sale securities pledged | U.S. Government agencies
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged financial instruments	0
Overnight Sweep Collateral | Available-for-sale securities pledged | Mortgage-backed securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged financial instruments	38,942
Overnight Sweep Collateral | Held-to-maturity securities pledged | U.S. Government agencies
Financial Instruments Owned and Pledged as Collateral [Line Items]
Pledged financial instruments	$ 14,400

FHLB Advances, Other Borrowin_4

FHLB Advances, Other Borrowings and Subordinated Notes (Narrative) (Details) $ in Millions	1 Months Ended					3 Months Ended	24 Months Ended	48 Months Ended	54 Months Ended	62 Months Ended
	Feb. 28, 2019CAD ($)	Jun. 30, 2018CAD ($)	Dec. 31, 2017CAD ($)	Dec. 31, 2015CAD ($)	Dec. 31, 2014CAD ($)	Mar. 31, 2019USD ($)buildingRate	Dec. 31, 2015CAD ($)	Dec. 31, 2017CAD ($)	Jun. 30, 2018CAD ($)	Feb. 28, 2019CAD ($)	Dec. 31, 2018USD ($)	Sep. 18, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 15, 2014USD ($)
Debt Instrument [Line Items]
Notes payable						$ 139,119,000					$ 144,461,000	$ 150,000,000	$ 33,727,000	$ 150,000,000
Short-term borrowings						16,212,000					50,593,000		17,977,000
Other borrowings						47,394,000					47,722,000		48,742,000
Secured borrowings						169,469,000					151,079,000		146,646,000
Subordinated notes						139,235,000					139,210,000		139,111,000
Revolving Credit Facility
Debt Instrument [Line Items]
Notes payable												50,000,000		75,000,000
Amount outstanding						0
Term Facility
Debt Instrument [Line Items]
Notes payable						$ 139,100,000						150,000,000	33,700,000	$ 75,000,000
Base Rate Loan | Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate						0.50%
Base Rate Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate						1.00%
Line of Credit | Credit Agreement
Debt Instrument [Line Items]
Loan agreement with unaffiliated banks												$ 200,000,000
Term Facility | Base Rate Loan | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate						0.75%
Term Facility | Eurodollar Rate Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate						1.25%
Revolving Credit Facility
Debt Instrument [Line Items]
Commitment fee | Rate						0.20%
Revolving Credit Facility | Base Rate Loan | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate						0.50%
Revolving Credit Facility | Eurodollar Rate Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate						1.25%
Securities sold under repurchase agreements
Debt Instrument [Line Items]
Securities sold under agreements to repurchase						$ 16,200,000					50,600,000		18,000,000
Pledged financial instruments						$ 53,300,000
Fixed Rate Promissory Note
Debt Instrument [Line Items]
Number of properties securing debt | building						2
Other borrowings						$ 47,400,000					47,700,000		48,700,000
Fixed interest rate						3.36%
Secured Debt
Debt Instrument [Line Items]
Secured borrowings						$ 12,300,000
Secured Debt | Receivables Purchase Agreement
Debt Instrument [Line Items]
Fixed interest rate						2.9398%
Proceeds from debt issuance	$ 20	$ 20	$ 10	$ 10	$ 150		$ 160	$ 170	$ 190	$ 210
Secured borrowings						$ 157,200,000					$ 139,300,000		$ 131,700,000
Subordinated Debt
Debt Instrument [Line Items]
Fixed interest rate						5.00%

Junior Subordinated Debenture_2

Junior Subordinated Debentures (Narrative) (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)trustRate	Dec. 31, 2018USD ($)	Mar. 31, 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	$ 253,566	$ 253,566
Junior Subordinated Debt
Subordinated Borrowing [Line Items]
Junior subordinated debentures	$ 253,566
Weighted average contractual interest rate | Rate	4.82%
Period of deferred payment, not to exceed	60 months
Tier two risk based capital	$ 245,500

Junior Subordinated Debenture_3

Junior Subordinated Debentures (Summary of Junior Subordinated Debentures) (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 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
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	6.04%
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	5.39%
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	5.19%
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	4.56%
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	4.04%
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	4.24%
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	5.74%
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	5.74%
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	5.59%
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	4.36%
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	4.23%
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%

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Disaggregation of Revenue by Source (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 39,382	$ 38,180
Mortgage broker fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	182	279
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	8,848	8,857
Administrative services
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,030	1,061
Card related fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2,556	2,139
Other deposit related fees
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	2,789	2,858
Wealth management
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	23,977	22,986
Wealth management | Brokerage and insurance product commissions
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4,516	6,031
Wealth management | Trust
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	5,327	3,417
Wealth management | Asset management
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 14,134	$ 13,538

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	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Contract assets	$ 0	$ 0	$ 0
Contract liabilities	1,639	1,727	1,614
Mortgage broker fees receivable	34	44	20
Administrative services receivable	147	275	0
Wealth management receivable	10,397	13,610	8,111
Card related fees receivable	385	0	320
Total receivables from contracts with customer	$ 10,963	$ 13,929	$ 8,451

Revenue from Contracts with C_5

Revenue from Contracts with Customers - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)subsidiary	Mar. 31, 2018USD ($)
Revenue from Contract with Customer [Abstract]
Number of wealth management subsidiaries | subsidiary	4
Revenue recognized from contract liability balance | $	$ 92	$ 92

Revenue from Contracts with C_6

Revenue from Contracts with Customers - Performance Obligations Unsatisfied at End of Period (Details) $ in Thousands	Mar. 31, 2019USD ($)
Revenue from Contract with Customer [Abstract]
Performance obligation unsatisfied or partially unsatisfied	$ 1,639
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Revenue from Contract with Customer [Abstract]
Performance obligation unsatisfied or partially unsatisfied	$ 671
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated remaining performance period	9 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	$ 369
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

Segment Information (Narrative)

Segment Information (Narrative) (Detail)	3 Months Ended
	Mar. 31, 2019subsidiarysegment
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
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Net interest income:
Net interest income	$ 261,986	$ 225,082
Net interest income, Change in Contribution	$ 36,904
Net interest income, Change in Contribution (as a percent)	16.00%
Non-interest income:
Non-interest income	$ 81,657	85,679
Non-interest income, Change in Contribution	$ (4,022)
Non-interest income, Change in Contribution (as a percent)	(5.00%)
Net revenue:
Net revenue	$ 343,643	310,761
Net revenue, Change in Contribution	$ 32,882
Net revenue, Change in Contribution (as a percent)	11.00%
Segment profit:
Segment profit	$ 89,146	81,981
Segment profit, Change in Contribution	$ 7,165
Segment profit, Change in Contribution (as a percent)	9.00%
Segment assets:
Segment assets	$ 32,358,621	28,456,772	$ 31,244,849
Segment assets, Change in Contribution	$ 3,901,849
Segment assets, Change in Contribution (as a percent)	14.00%
Community banking
Segment profit:
Segment profit	$ 60,326	57,280
Segment profit, Change in Contribution	$ 3,046
Segment profit, Change in Contribution (as a percent)	5.00%
Segment assets:
Segment assets	$ 25,997,025	23,213,499
Segment assets, Change in Contribution	$ 2,783,526
Segment assets, Change in Contribution (as a percent)	12.00%
Specialty finance
Segment profit:
Segment profit	$ 21,848	20,000
Segment profit, Change in Contribution	$ 1,848
Segment profit, Change in Contribution (as a percent)	9.00%
Segment assets:
Segment assets	$ 5,234,210	4,568,906
Segment assets, Change in Contribution	$ 665,304
Segment assets, Change in Contribution (as a percent)	15.00%
Wealth management
Segment profit:
Segment profit	$ 6,972	4,701
Segment profit, Change in Contribution	$ 2,271
Segment profit, Change in Contribution (as a percent)	48.00%
Segment assets:
Segment assets	$ 1,127,386	674,367
Segment assets, Change in Contribution	$ 453,019
Segment assets, Change in Contribution (as a percent)	67.00%
Operating Segments
Net interest income:
Net interest income	$ 256,632	220,607
Net interest income, Change in Contribution	$ 36,025
Net interest income, Change in Contribution (as a percent)	16.00%
Non-interest income:
Non-interest income	$ 92,908	95,230
Non-interest income, Change in Contribution	$ (2,322)
Non-interest income, Change in Contribution (as a percent)	(2.00%)
Net revenue:
Net revenue	$ 349,540	315,837
Net revenue, Change in Contribution	$ 33,703
Net revenue, Change in Contribution (as a percent)	11.00%
Operating Segments | Community banking
Net interest income:
Net interest income	$ 211,424	183,254
Net interest income, Change in Contribution	$ 28,170
Net interest income, Change in Contribution (as a percent)	15.00%
Non-interest income:
Non-interest income	$ 48,267	56,547
Non-interest income, Change in Contribution	$ (8,280)
Non-interest income, Change in Contribution (as a percent)	(15.00%)
Net revenue:
Net revenue	$ 259,691	239,801
Net revenue, Change in Contribution	$ 19,890
Net revenue, Change in Contribution (as a percent)	8.00%
Operating Segments | Specialty finance
Net interest income:
Net interest income	$ 37,706	32,912
Net interest income, Change in Contribution	$ 4,794
Net interest income, Change in Contribution (as a percent)	15.00%
Non-interest income:
Non-interest income	$ 19,606	15,725
Non-interest income, Change in Contribution	$ 3,881
Non-interest income, Change in Contribution (as a percent)	25.00%
Net revenue:
Net revenue	$ 57,312	48,637
Net revenue, Change in Contribution	$ 8,675
Net revenue, Change in Contribution (as a percent)	18.00%
Operating Segments | Wealth management
Net interest income:
Net interest income	$ 7,502	4,441
Net interest income, Change in Contribution	$ 3,061
Net interest income, Change in Contribution (as a percent)	69.00%
Non-interest income:
Non-interest income	$ 25,035	22,958
Non-interest income, Change in Contribution	$ 2,077
Non-interest income, Change in Contribution (as a percent)	9.00%
Net revenue:
Net revenue	$ 32,537	27,399
Net revenue, Change in Contribution	$ 5,138
Net revenue, Change in Contribution (as a percent)	19.00%
Intersegment Eliminations
Net interest income:
Net interest income	$ 5,354	4,475
Net interest income, Change in Contribution	$ 879
Net interest income, Change in Contribution (as a percent)	20.00%
Non-interest income:
Non-interest income	$ (11,251)	(9,551)
Non-interest income, Change in Contribution	$ (1,700)
Non-interest income, Change in Contribution (as a percent)	(18.00%)
Net revenue:
Net revenue	$ (5,897)	$ (5,076)
Net revenue, Change in Contribution	$ (821)
Net revenue, Change in Contribution (as a percent)	(16.00%)

Derivative Financial Instrume_3

Derivative Financial Instruments (Schedule Of Fair Value Of Derivative Financial Instruments) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Derivative [Line Items]
Derivative assets	$ 75,504	$ 73,172	$ 78,960
Derivative liabilities	73,868	68,088	55,699
Interest Rate Contract
Derivative [Line Items]
Derivative assets	68,317	68,425	72,970
Derivative liabilities	69,292	62,571	52,443
Designated as Hedging Instrument
Derivative [Line Items]
Derivative assets	4,613	8,906	19,974
Derivative liabilities	5,756	3,412	35
Designated as Hedging Instrument | Interest Rate Contract | Cash Flow Hedging
Derivative [Line Items]
Derivative assets	3,353	6,270	15,012
Derivative liabilities	2,589	1,656	35
Designated as Hedging Instrument | Interest Rate Contract | Fair Value Hedging
Derivative [Line Items]
Derivative assets	1,260	2,636	4,962
Derivative liabilities	3,167	1,756	0
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative assets	70,891	64,266	58,986
Derivative liabilities	68,112	64,676	55,664
Not Designated as Hedging Instrument | Interest Rate Contract
Derivative [Line Items]
Derivative assets	63,704	59,519	52,996
Derivative liabilities	63,536	59,159	52,408
Not Designated as Hedging Instrument | Interest Rate Lock Commitments
Derivative [Line Items]
Derivative assets	4,387	3,405	5,449
Derivative liabilities	0	2,694	1,207
Not Designated as Hedging Instrument | Forward Commitments to Sell Mortgage Loans
Derivative [Line Items]
Derivative assets	2,416	0	3
Derivative liabilities	4,180	1,486	1,464
Not Designated as Hedging Instrument | Foreign Exchange Contract
Derivative [Line Items]
Derivative assets	384	1,342	538
Derivative liabilities	$ 396	$ 1,337	$ 585

Derivative Financial Instrume_4

Derivative Financial Instruments (Narrative) (Detail)	3 Months Ended
	Mar. 31, 2019USD ($)derivative_instruments	Dec. 31, 2018derivative_instruments	Mar. 31, 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	$ 7,700,000
Net derivative liability position, aggregate fair value	36,500,000
Interest Rate Contract | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	6,400,000,000
Forward Commitments to Sell Mortgage Loans | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	651,900,000
Interest Rate Lock Commitments | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	403,200,000
Foreign Exchange Contract | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 37,100,000
Covered Call Options | Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Number of derivative instruments held | derivative_instruments	0	0	0
Cash Flow Hedging | Cash flow hedge of variable rate deposits | Interest Rate Swap | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate derivatives held | derivative_instruments	3
Cash Flow Hedging | Cash flow hedge of variable rate deposits | 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	16
Notional amount	$ 172,300,000
Fair Value Hedging | Interest Rate Swap | Effective after March 31, 2019 | 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	Mar. 31, 2019USD ($)
June 2019
Derivative [Line Items]
Notional Amount	$ 200,000,000
Fair Value Asset (Liability)	429,000
July 2019
Derivative [Line Items]
Notional Amount	250,000,000
Fair Value Asset (Liability)	1,083,000
August 2019
Derivative [Line Items]
Notional Amount	275,000,000
Fair Value Asset (Liability)	1,841,000
September 2023
Derivative [Line Items]
Notional Amount	139,286,000
Fair Value Asset (Liability)	(2,589,000)
Total Cash Flow Hedges
Derivative [Line Items]
Notional Amount	864,286,000
Fair Value Asset (Liability)	$ 764,000

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) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]
Amount of (loss) gain recognized in other comprehensive income	$ (4,996)	$ 3,075
Interest Rate Contract
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]
Unrealized gain at beginning of period	10,742	11,902
Amount reclassified from accumulated other comprehensive income to interest expense on deposits and other borrowings	(3,562)	(680)
Amount of (loss) gain recognized in other comprehensive income	(1,434)	3,755
Unrealized gain at end of period	$ 5,746	$ 14,977

Derivative Financial Instrume_7

Derivative Financial Instruments (Schedule of Carrying Amount of Hedged Assets/(Liabilities)) (Detail) - Interest Rate Swap $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Loans, net of unearned income
Derivative [Line Items]
Carrying Amount of the Hedged Assets/(Liabilities)	$ 165,746
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)	1,776
Cumulative Amount of Fair Value Hedging Adjustment Remaining for any Hedged Assets (Liabilities) for which Hedge Accounting has been Discontinued	0
Available-for-sale debt securities
Derivative [Line Items]
Carrying Amount of the Hedged Assets/(Liabilities)	1,461
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)	57
Cumulative Amount of Fair Value Hedging Adjustment Remaining for any Hedged Assets (Liabilities) for which Hedge Accounting has been Discontinued	0
Interest and Fee Income, Loans and Leases [Member]
Derivative [Line Items]
Location of (Loss)/Gain Recognized in Income on Derivative	(42)
Interest and Dividend Income, Securities, Operating [Member]
Derivative [Line Items]
Location of (Loss)/Gain Recognized in Income on Derivative	$ 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
	Mar. 31, 2019	Mar. 31, 2018
Interest rate swaps and caps | Trading (losses) gains, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ (191)	$ 153
Mortgage banking derivatives | Mortgage banking revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	50	1,418
Covered call options | Fees from covered call options
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	1,784	1,597
Foreign exchange contracts | Trading (losses) gains, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivative instruments	$ (12)	$ (43)

Derivative Financial Instrume_9

Derivative Financial Instruments (Derivative Asset and Liability Balance Sheet Offsetting) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Offsetting Assets [Line Items]
Gross Amounts Recognized	$ 75,504	$ 73,172	$ 78,960
Derivative Liabilities
Gross Amounts Recognized	73,868	68,088	55,699
Interest Rate Contract
Offsetting Assets [Line Items]
Gross Amounts Recognized	68,317	68,425	72,970
Less: Amounts offset in the Statements of Financial Condition	0	0	0
Net amount presented in the Statements of Financial Condition	68,317	68,425	72,970
Gross amounts not offset in the Statements of Financial Condition
Offsetting Derivative Positions	(18,878)	(28,124)	(9,627)
Collateral Posted	0	(23,810)	(54,490)
Net Credit Exposure	49,439	16,491	8,853
Derivative Liabilities
Gross Amounts Recognized	69,292	62,571	52,443
Less: Amounts offset in the Statements of Financial Condition	0	0	0
Net amount presented in the Statements of Financial Condition	69,292	62,571	52,443
Gross amounts not offset in the Statements of Financial Condition
Offsetting Derivative Positions	(18,878)	(28,124)	(9,627)
Collateral Posted	(45,540)	(2,640)	(340)
Net Credit Exposure	$ 4,874	$ 31,807	$ 42,476

Fair Values of Assets and Lia_3

Fair Values of Assets and Liabilities (Narrative) (Detail)	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	$ 2,185,782,000	$ 2,126,081,000	$ 1,895,688,000
Loans held-for-investment	101,071,000		67,962,000
MSRs	71,022,000	75,183,000	54,572,000	$ 33,676,000
Mortgage loans held-for-sale, at fair value	248,557,000	264,070,000	411,505,000
Impaired loans—collateral based	144,118,000	127,269,000	103,131,000
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	2,185,782,000	2,126,081,000	1,895,688,000
Remaining contractual principal balance outstanding, mortgage loans held-for-sale	243,600,000	253,700,000	396,900,000
Mortgage loans held-for-sale, at fair value	248,557,000	264,070,000	411,505,000
Portion at Other than Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans—collateral based	42,800,000
Non-performing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage loans held-for-sale, at fair value	1,900,000	1,900,000	0
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	101,071,000	93,857,000	67,962,000
MSRs	71,022,000	75,183,000	54,572,000
Derivative assets	75,504,000	73,172,000	78,960,000
Mortgage loans held-for-sale, at fair value	248,557,000	264,070,000	411,505,000
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	101,331,000
Other real estate owned	21,520,000
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	11,249,000	11,347,000	26,620,000
MSRs	71,022,000	75,183,000	54,572,000
Derivative assets	3,089,000	2,457,000	4,605,000
Mortgage loans held-for-sale, at fair value	0	0	0
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	101,331,000
Other real estate owned	21,520,000
Municipal Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	136,353,000	138,490,000	121,758,000
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	136,353,000	138,490,000	121,758,000
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	103,834,000	108,926,000	84,592,000
U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, at fair value	130,687,000	140,307,000	149,336,000
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	130,687,000	140,307,000	149,336,000
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	$ 2,993,000	$ 3,150,000	$ 3,616,000
Discount rate | Level 3 | Measured at fair value on a recurring basis: | 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
Discount rate | Level 3 | Measured at fair value on a recurring basis: | Weighted Average of Inputs | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.0394
Discount rate | Level 3 | Measured at fair value on a recurring basis: | Weighted Average of Inputs | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.0996
Discount rate | Level 3 | Measured at fair value on a recurring basis: | Minimum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	0.07
Discount rate | Level 3 | Measured at fair value on a recurring basis: | Minimum | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.03
Discount rate | Level 3 | Measured at fair value on a recurring basis: | Minimum | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.07
Discount rate | Level 3 | Measured at fair value on a recurring basis: | Maximum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	0.17
Discount rate | Level 3 | Measured at fair value on a recurring basis: | Maximum | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.04
Discount rate | Level 3 | Measured at fair value on a recurring basis: | Maximum | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.17
Credit discount | Level 3 | Measured at fair value on a recurring basis: | Weighted Average of Inputs | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.0124
Credit discount | Level 3 | Measured at fair value on a recurring basis: | Minimum | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0
Credit discount | Level 3 | Measured at fair value on a recurring basis: | Maximum | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.07
Constant prepayment rate (CPR) | Level 3 | Measured at fair value on a recurring basis: | Loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.1401
Constant prepayment rate (CPR) | Level 3 | Measured at fair value on a recurring basis: | Weighted Average of Inputs | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	0.1401
Constant prepayment rate (CPR) | Level 3 | Measured at fair value on a recurring basis: | Weighted Average of Inputs | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.1401
Constant prepayment rate (CPR) | Level 3 | Measured at fair value on a recurring basis: | Minimum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	0
Constant prepayment rate (CPR) | Level 3 | Measured at fair value on a recurring basis: | Minimum | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0
Constant prepayment rate (CPR) | Level 3 | Measured at fair value on a recurring basis: | Maximum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	0.93
Constant prepayment rate (CPR) | Level 3 | Measured at fair value on a recurring basis: | Maximum | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.93
Cost of servicing | Level 3 | Measured at fair value on a recurring basis: | Weighted Average of Inputs | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	77
Cost of servicing | Level 3 | Measured at fair value on a recurring basis: | Minimum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	70
Cost of servicing | Level 3 | Measured at fair value on a recurring basis: | Maximum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	200
Cost of servicing - delinquent | Level 3 | Measured at fair value on a recurring basis: | Weighted Average of Inputs | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	407
Cost of servicing - delinquent | Level 3 | Measured at fair value on a recurring basis: | Minimum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	200
Cost of servicing - delinquent | Level 3 | Measured at fair value on a recurring basis: | Maximum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs, measurement input	1,000
Pull-through rate | Level 3 | Measured at fair value on a recurring basis: | Weighted Average of Inputs | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, measurement input	0.7882
Pull-through rate | Level 3 | Measured at fair value on a recurring basis: | Minimum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, measurement input	0
Pull-through rate | Level 3 | Measured at fair value on a recurring basis: | Maximum | Discounted cash flows
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, measurement input	1
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

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	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 2,185,782	$ 2,126,081	$ 1,895,688
Trading account securities	559	1,692	1,682
Equity securities with readily determinable fair value	47,653	34,717	37,832
Mortgage loans held-for-sale, at fair value	248,557	264,070	411,505
Loans held-for-investment	101,071		67,962
MSRs	71,022	75,183	54,572	$ 33,676
U.S. Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	126,718	126,404	24,727
U.S. Government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	130,687	140,307	149,336
Municipal Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	136,353	138,490	121,758
Measured at fair value on a recurring basis:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading account securities	559	1,692	1,682
Equity securities with readily determinable fair value	47,653	34,717	37,832
Mortgage loans held-for-sale, at fair value	248,557	264,070	411,505
Loans held-for-investment	101,071	93,857	67,962
MSRs	71,022	75,183	54,572
Nonqualified deferred compensation assets	13,230	11,282	11,724
Derivative assets	75,504	73,172	78,960
Total financial assets	2,743,378	2,680,054	2,559,925
Derivative liabilities	73,868	68,088	55,699
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	126,718	126,404	24,727
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	130,687	140,307	149,336
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	136,353	138,490	121,758
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	93,333	91,045	99,714
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	1,698,691	1,629,835	1,500,153
Measured at fair value on a recurring basis: | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities with readily determinable fair value	39,587
Loans held-for-investment		0
Total financial assets	166,305	126,404
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	126,718	126,404
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	559	1,692	1,682
Equity securities with readily determinable fair value	8,066	34,717	37,832
Mortgage loans held-for-sale, at fair value	248,557	264,070	411,505
Loans held-for-investment	89,822	82,510	41,342
MSRs	0	0	0
Nonqualified deferred compensation assets	13,230	11,282	11,724
Derivative assets	72,415	70,715	74,355
Total financial assets	2,384,886	2,352,587	2,385,920
Derivative liabilities	73,868	68,088	55,699
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	24,727
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	127,694	137,157	145,720
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	32,519	29,564	37,166
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	93,333	91,045	99,714
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	1,698,691	1,629,835	1,500,153
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	11,249	11,347	26,620
MSRs	71,022	75,183	54,572
Nonqualified deferred compensation assets	0	0	0
Derivative assets	3,089	2,457	4,605
Total financial assets	192,187	201,063	174,005
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	2,993	3,150	3,616
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	103,834	108,926	84,592
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
	Mar. 31, 2019	Mar. 31, 2018
Loans held-for- investment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 11,347	$ 33,717
Net Income	167	(1,128)
Other comprehensive loss	0	0
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	(465)	(6,255)
Net transfers into/(out of) Level 3	200	286
Ending Balance	11,249	26,620
Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	75,183	33,676
Net Income	(4,161)	7,090
Other comprehensive loss		0
Purchases		13,806
Issuances	0	0
Settlements		0
Net transfers into/(out of) Level 3	0	0
Ending Balance	71,022	54,572
Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	2,457	2,157
Net Income	632	2,448
Other comprehensive loss	0	0
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	0	0
Net transfers into/(out of) Level 3	0	0
Ending Balance	3,089	4,605
Municipal Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	108,926	77,181
Net Income		0
Other comprehensive loss	1,537	(2,190)
Purchases	969	12,270
Issuances	0	0
Sales	0	0
Settlements	(7,598)	(2,669)
Net transfers into/(out of) Level 3		0
Ending Balance	103,834	84,592
U.S. Government agencies
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	3,150	3,779
Net Income	0	0
Other comprehensive loss	1	(163)
Purchases	0	0
Issuances	0	0
Sales	0	0
Settlements	(158)	0
Net transfers into/(out of) Level 3	0	0
Ending Balance	$ 2,993	$ 3,616

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
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans—collateral based	$ 144,118	$ 127,269	$ 103,131
Fair Value Losses Recognized, Impaired loans—collateral based	4,378
Fair Value Losses Recognized, Other real estate owned	574
Fair Value Losses Recognized, Total	4,952
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	101,331
Other real estate owned	21,520
Total financial assets	122,851
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
Other real estate owned	0
Total financial assets	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
Other real estate owned	0
Total financial assets	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	101,331
Other real estate owned	21,520
Total financial assets	$ 122,851

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) $ in Thousands	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities, at fair value	$ 2,185,782	$ 2,126,081	$ 1,895,688
Loans held-for-investment	101,071		67,962
MSRs	71,022	75,183	54,572	$ 33,676
Impaired loans—collateral based	144,118	127,269	103,131
Municipal Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities, at fair value	136,353	138,490	121,758
U.S. Government agencies
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale securities, at fair value	130,687	140,307	149,336
Measured at fair value on a recurring basis:
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment	101,071	93,857	67,962
MSRs	71,022	75,183	54,572
Derivative assets	75,504	73,172	78,960
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	136,353	138,490	121,758
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	130,687	140,307	149,336
Measured at fair value on a non-recurring basis:
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans—collateral based	101,331
Other real estate owned	21,520
Level 3 | Measured at fair value on a recurring basis:
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans held-for-investment	11,249	11,347	26,620
MSRs	71,022	75,183	54,572
Derivative assets	3,089	2,457	4,605
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	103,834	108,926	84,592
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	2,993	$ 3,150	$ 3,616
Level 3 | Measured at fair value on a non-recurring basis:
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans—collateral based	101,331
Other real estate owned	$ 21,520
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	0.07
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	0.17
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	0.0394
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	0.0124
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	0.1401
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	0.1401
MSRs, measurement input	0.1401
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]
MSRs, measurement input	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]
MSRs, measurement input	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	407
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	0.7882
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	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 270,823	$ 392,200	$ 231,464	$ 277,591
Interest bearing deposits with banks	1,609,852	1,099,594	980,380
Available-for-sale securities	2,185,782	2,126,081	1,895,688
Held-to-maturity securities	1,041,695	1,036,096	862,527
Trading account securities	559	1,692	1,682
Equity securities with readily determinable fair value	47,653	34,717	37,832
FHLB and FRB stock, at cost	89,013	91,354	104,956
Brokerage customer receivables	14,219	12,609	24,531
Mortgage loans held-for-sale, at fair value	248,557	264,070	411,505
Accrued interest receivable and other	888,492	696,707	601,794
FHLB advances	576,353	426,326	915,000
Other borrowings	372,194	393,855	247,092
Subordinated notes	139,235	139,210	139,111
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	270,823	392,200	231,464
Interest bearing deposits with banks	1,609,852	1,099,594	980,380
Available-for-sale securities	2,185,782	2,126,081	1,895,688
Held-to-maturity securities	1,051,542	1,067,439	892,937
Trading account securities	559	1,692	1,682
Equity securities with readily determinable fair value	47,653	34,717	37,832
FHLB and FRB stock, at cost	89,013	91,354	104,956
Brokerage customer receivables	14,219	12,609	24,531
Mortgage loans held-for-sale, at fair value	248,557	264,070	411,505
Loans held-for-investment, at fair value	101,071	93,857	67,962
Loans held-for-investment, at amortized cost	24,113,558	23,726,834	21,994,172
Nonqualified deferred compensation assets	13,230	11,282	11,724
Derivative assets	75,504	73,172	78,960
Accrued interest receivable and other	275,464	260,281	236,131
Total financial assets	30,096,827	29,255,182	26,969,924
Non-maturity deposits	21,454,035	20,833,837	18,941,201
Deposits with stated maturities	5,350,707	5,260,841	4,338,126
FHLB advances	576,353	426,326	915,000
Other borrowings	372,194	393,855	247,092
Subordinated notes	139,235	139,210	139,111
Junior subordinated debentures	253,566	253,566	253,566
Derivative liabilities	73,868	68,088	55,699
Accrued interest payable	19,569	16,025	11,442
Total financial liabilities	28,239,527	27,391,748	24,901,237
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	270,823	392,200	231,464
Interest bearing deposits with banks	1,609,852	1,099,594	980,380
Available-for-sale securities	2,185,782	2,126,081	1,895,688
Held-to-maturity securities	1,041,695	1,036,096	862,527
Trading account securities	559	1,692	1,682
Equity securities with readily determinable fair value	47,653	34,717	37,832
FHLB and FRB stock, at cost	89,013	91,354	104,956
Brokerage customer receivables	14,219	12,609	24,531
Mortgage loans held-for-sale, at fair value	248,557	264,070	411,505
Loans held-for-investment, at fair value	101,071	93,857	67,962
Loans held-for-investment, at amortized cost	24,123,328	23,780,739	22,234,795
Nonqualified deferred compensation assets	13,230	11,282	11,724
Derivative assets	75,504	73,172	78,960
Accrued interest receivable and other	275,464	260,281	236,131
Total financial assets	30,096,750	29,277,744	27,180,137
Non-maturity deposits	21,454,035	20,833,837	18,941,201
Deposits with stated maturities	5,377,388	5,283,063	4,344,584
FHLB advances	604,976	429,830	916,513
Other borrowings	372,194	393,855	247,092
Subordinated notes	144,019	138,345	140,889
Junior subordinated debentures	252,451	263,846	268,873
Derivative liabilities	73,868	68,088	55,699
Accrued interest payable	19,569	16,025	11,442
Total financial liabilities	$ 28,298,500	$ 27,426,889	$ 24,926,293

Stock-Based Compensation Plan_2

Stock-Based Compensation Plans (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		27 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	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)	2,600,000		2,600,000
Number of stock options granted	0	0	0
Stock-based compensation expense	$ 3.3	$ 3.7
Aggregate intrinsic value of options exercised	2.8	7.5
Cash received from option exercises	$ 2.9	$ 7.2
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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 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]
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	3 Months Ended		27 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019
Common Shares
Common Shares, Outstanding at beginning of the period (in shares)	795,014	1,084,756
Common Shares, Granted (in shares)	0	0	0
Common Shares, Exercised (in shares)	(78,667)	(169,387)
Common Shares, Forfeited or canceled (in shares)	0	(1,703)
Common Shares, Outstanding at end of the period (in shares)	716,347	913,666	716,347
Common Shares, Exercisable (in shares)	701,227	712,535	701,227
Weighted Average Strike Price
Weighted Average Strike Price, Outstanding at beginning of period (usd per share)	$ 42.25	$ 41.98
Weighted Average Strike Price, Granted (usd per share)	0	0
Weighted Average Strike Price, Exercised (usd per share)	37.41	42.47
Weighted Average Strike Price, Forfeited or canceled (usd per share)	0	40.87
Weighted Average Strike Price, Outstanding at end of period (usd per share)	42.79	41.89	$ 42.79
Weighted Average Strike Price, Exercisable (usd per share)	$ 42.75	$ 42	$ 42.75
Remaining Contractual Term, Outstanding	2 years 10 months 24 days	3 years 8 months 12 days
Remaining Contractual Term, Exercisable	2 years 10 months 24 days	3 years 4 months 24 days
Intrinsic Value, Outstanding	$ 17,583	$ 40,351	$ 17,583
Intrinsic Value, Exercisable	$ 17,234	$ 31,391	$ 17,234

Stock-Based Compensation Plan_4

Stock-Based Compensation Plans (Summary Of Plans' Restricted Share And Performance-Vested Stock Award Activity) (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restricted shares
Common Shares
Outstanding Beginning of the Period (in shares)	143,263	127,787
Granted (in shares)	9,673	20,700
Vested and issued (in shares)	(11,042)	(7,258)
Forfeited or canceled (in shares)	(215)	(982)
Outstanding End of the Period (in shares)	141,679	140,247
Vested, but not issuable (in shares)	90,824	89,924
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	86.42
Weighted Average Grant-Date Fair Value, Vested and issued (usd per share)	75	53.47
Weighted Average Grant-Date Fair Value, Forfeited or canceled (usd per share)	93.14	55.39
Ending Weighted Average Grant-Date Fair Value (usd per share)	60.38	58.20
Weighted Average Grant-Date Fair Value, Vested, but not issuable (usd per share)	$ 52.02	$ 51.71
Performance-based stock
Common Shares
Outstanding Beginning of the Period (in shares)	396,855	359,196
Granted (in shares)	173,856	127,419
Vested and issued (in shares)	(94,288)	(82,307)
Forfeited or canceled (in shares)	(2,747)	(6,580)
Outstanding End of the Period (in shares)	473,676	397,728
Vested, but not issuable (in shares)	33,451	21,388
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	88.20
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)	67.85	49.42
Ending Weighted Average Grant-Date Fair Value (usd per share)	74.44	67.35
Weighted Average Grant-Date Fair Value, Vested, but not issuable (usd per share)	$ 42.70	$ 43.32

Shareholders' Equity And Earn_3

Shareholders' Equity And Earnings Per Share (Components Of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	Jan. 01, 2018	Mar. 31, 2019	Mar. 31, 2018
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance	$ 2,976,939	$ 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		29,194	(26,625)
Amount reclassified from accumulated other comprehensive loss into net income, net of tax		(2,563)	216
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		(103)	3
Total other comprehensive income (loss)		26,528	(26,406)
Balance		3,371,972	3,031,250
Accumulated Unrealized Losses on Securities
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance	(15,813)	(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		27,956	(26,474)
Amount reclassified from accumulated other comprehensive loss into net income, net of tax		49	713
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		(103)	3
Total other comprehensive income (loss)		27,902	(25,758)
Balance		(14,451)	(47,968)
Accumulated Unrealized Gains on Derivative Instruments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance	7,164	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		(1,039)	2,746
Amount reclassified from accumulated other comprehensive loss into net income, net of tax		(2,612)	(497)
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
Total other comprehensive income (loss)		(3,651)	2,249
Balance		4,206	10,956
Accumulated Foreign Currency Translation Adjustments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance	(33,186)	(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		2,277	(2,897)
Amount reclassified from accumulated other comprehensive loss into net income, net of tax		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
Total other comprehensive income (loss)		2,277	(2,897)
Balance		(40,099)	(36,083)
Accumulated other comprehensive loss
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance	(41,835)	(76,872)	(41,835)
Cumulative effect adjustment from the adoption of ASU 2018-02	(2,974)
Total other comprehensive income (loss)		26,528	(26,406)
Balance		$ (50,344)	$ (73,095)
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
	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest on deposits	$ 60,976	$ 26,549
Interest on other borrowings	3,633	1,699
Income before taxes	118,645	108,066
Income tax expense	(29,499)	(26,085)
Net income	89,146	81,981
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	(67)	(975)
Income before taxes	(67)	(975)
Income tax expense	18	262
Net income	(49)	(713)
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]
Interest on deposits	(3,589)	(680)
Interest on other borrowings	27	0
Income before taxes	3,562	680
Income tax expense	(950)	(183)
Net income	$ 2,612	$ 497

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
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Net income	$ 89,146	$ 81,981
Less: Preferred stock dividends	2,050	2,050
Net income applicable to common shares	$ 87,096	$ 79,931
Weighted average common shares outstanding (in shares)	56,529	56,137
Effect of dilutive potential common shares
Common stock equivalents (in shares)	699	888
Average common shares and dilutive common shares (in shares)	57,228	57,025
Net income per common share:
Basic (usd per share)	$ 1.54	$ 1.42
Diluted (usd per share)	$ 1.52	$ 1.40

Shareholders' Equity And Earn_6

Shareholders' Equity And Earnings Per Share (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands	Dec. 19, 2008	Jan. 31, 2019	Jun. 30, 2015	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Temporary Equity [Line Items]
Cash dividends declared per common share (usd per share)		$ 0.25		$ 0.25	$ 0.19
Common stock dividends per share declared annualized (usd per share)		$ 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
Preferred stock, liquidation value per share (usd per share)			$ 25	$ 25	$ 25	$ 25
Preferred stock, value			$ 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%