First Midwest Bancorp (ONBPP) 10-Q 27 Oct 21 2021 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2021	Oct. 25, 2021
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-39320
Entity Registrant Name	First Midwest Bancorp, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-3161078
Entity Address, Address Line One	8750 West Bryn Mawr Avenue
Entity Address, Address Line Two	Suite 1300
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60631-3655
City Area Code	708
Local Phone Number	831-7483
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		114,159,965
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Entity Central Index Key	0000702325
Document Period End Date	Sep. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Common Shares Outstanding
Document Information [Line Items]
Title of 12(b) Security	Common stock, $0.01 par value
Trading Symbol	FMBI
Security Exchange Name	NASDAQ
Series A Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	Depositary shares, each representing a 1/40th interest in a share of 7.000% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A
Trading Symbol	FMBIP
Security Exchange Name	NASDAQ
Series C Preferred Stock
Document Information [Line Items]
Title of 12(b) Security	Depositary shares, each representing a 1/40th interest in a share of 7.000% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series C
Trading Symbol	FMBIO
Security Exchange Name	NASDAQ

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 270,020	$ 196,364
Interest-bearing deposits in other banks	1,654,917	920,880
Equity securities, at fair value	114,848	76,404
Securities available-for-sale, at fair value	3,212,908	3,096,408
Securities held-to-maturity, at amortized cost, net	10,853	12,071
Federal Home Loan Bank ("FHLB") and Federal Reserve Bank ("FRB") stock, at cost	106,090	117,420
Loans	14,788,732	14,751,232
Allowance for loan losses	(206,241)	(239,017)
Net loans	14,582,491	14,512,215
Other real estate owned ("OREO")	5,106	8,253
Premises, furniture, and equipment, net	123,413	132,045
Investment in bank-owned life insurance ("BOLI")	300,387	301,101
Goodwill and other intangible assets	923,383	932,764
Accrued interest receivable and other assets	473,764	532,753
Total assets	21,778,180	20,838,678
Liabilities
Noninterest-bearing deposits	6,097,698	5,797,899
Interest-bearing deposits	11,100,704	10,214,565
Total deposits	17,198,402	16,012,464
Borrowed funds	1,274,572	1,546,414
Senior and subordinated debt	235,383	234,768
Accrued interest payable and other liabilities	346,600	355,026
Total liabilities	19,054,957	18,148,672
Stockholders' Equity
Preferred stock	230,500	230,500
Common stock	1,254	1,254
Additional paid-in capital	1,273,148	1,275,492
Retained earnings	1,479,481	1,388,525
Accumulated other comprehensive income (loss), net of tax	(25,381)	26,379
Treasury stock, at cost	(235,779)	(232,144)
Total stockholders' equity	2,723,223	2,690,006
Total liabilities and stockholders' equity	$ 21,778,180	$ 20,838,678
Stockholders' Equity, Number of Shares, Par Value, and Other Disclosures
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	1,000	1,000
Common stock, shares authorized (in shares)	250,000	250,000
Preferred stock, shares issued (in shares)	231	231
Common stock, shares issued (in shares)	125,380	125,367
Preferred stock, shares outstanding (in shares)	231	231
Common stock, shares outstanding (in shares)	114,167	114,296
Treasury stock, shares (in shares)	11,213	11,071

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest Income
Loans	$ 136,939,000	$ 138,228,000	$ 406,817,000	$ 426,833,000
Investment securities	15,659,000	19,082,000	47,583,000	59,706,000
Other short-term investments	2,074,000	1,775,000	5,422,000	4,817,000
Total interest income	154,672,000	159,085,000	459,822,000	491,356,000
Interest Expense
Deposits	2,863,000	6,837,000	9,451,000	34,031,000
Borrowed funds	3,146,000	6,021,000	9,365,000	15,018,000
Senior and subordinated debt	3,467,000	3,498,000	10,407,000	10,769,000
Total interest expense	9,476,000	16,356,000	29,223,000	59,818,000
Net interest income	145,196,000	142,729,000	430,599,000	431,538,000
Provision for loan losses	0	15,927,000	6,098,000	88,108,000
Net interest income after provision for loan losses	145,196,000	126,802,000	424,501,000	343,430,000
Noninterest Income
Wealth management fees	14,820,000	12,837,000	43,524,000	37,140,000
Service charges on deposit accounts	11,496,000	10,342,000	32,254,000	31,248,000
Mortgage banking income	6,664,000	6,659,000	23,600,000	11,924,000
Card-based fees	4,992,000	4,472,000	14,312,000	11,620,000
Capital market products income	1,333,000	886,000	5,376,000	6,302,000
Other service charges, commissions, and fees	2,832,000	2,823,000	8,416,000	7,583,000
Swap termination costs	0	(14,285,000)	0	(14,285,000)
Net securities gains	0	14,328,000	0	13,323,000
Other income	3,043,000	2,523,000	9,771,000	8,083,000
Total noninterest income	45,180,000	40,585,000	137,253,000	112,938,000
Noninterest Expense
Salaries and employee benefits	62,427,000	64,734,000	193,039,000	191,265,000
Net occupancy and equipment expense	14,198,000	13,736,000	42,604,000	43,079,000
Technology and related costs	10,742,000	10,416,000	31,479,000	28,817,000
Professional services	6,991,000	7,325,000	22,618,000	26,595,000
Net OREO expense	(4,000)	544,000	745,000	1,090,000
Other expenses	18,784,000	15,062,000	52,923,000	47,911,000
Acquisition and integration related expenses	2,916,000	881,000	10,934,000	11,602,000
Optimization costs	0	18,376,000	1,556,000	18,376,000
Total noninterest expense	116,054,000	131,074,000	355,898,000	368,735,000
Income before income tax expense	74,322,000	36,313,000	205,856,000	87,633,000
Income tax expense	19,459,000	8,690,000	54,849,000	21,340,000
Net income	54,863,000	27,623,000	151,007,000	66,293,000
Preferred dividends	(4,033,000)	(4,033,000)	(12,101,000)	(5,070,000)
Net income applicable to unvested restricted shares	(517,000)	(236,000)	(1,524,000)	(615,000)
Net income applicable to common shareholders	50,313,000	23,354,000	137,382,000	60,608,000
Net income applicable to common shareholders	$ 50,313,000	$ 23,354,000	$ 137,382,000	$ 60,608,000
Per Common Share Data
Basic earnings per common share (in dollars per share)	$ 0.45	$ 0.21	$ 1.22	$ 0.54
Diluted earnings per common share (in dollars per share)	0.44	0.21	1.21	0.54
Dividends declared per common share (in dollars per share)	$ 0.14	$ 0.14	$ 0.42	$ 0.42
Weighted-average common shares outstanding (in Shares)	112,898	113,160	112,953	112,079
Weighted-average diluted common shares outstanding (in Shares)	113,776	113,436	113,742	112,401

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 54,863	$ 27,623	$ 151,007	$ 66,293
Unrealized holding (losses) gains:
Before tax	(24,763)	(4,142)	(65,305)	54,683
Tax effect	6,837	1,138	18,017	(15,214)
Net of tax	(17,926)	(3,004)	(47,288)	39,469
Reclassification of net losses included in net income:
Before tax	0	14,328	0	13,323
Tax effect	0	(4,012)	0	(3,730)
Net of tax	0	10,316	0	9,593
Net unrealized holding (losses) gains	(17,926)	(13,320)	(47,288)	29,876
Unrealized holding losses:
Before tax	(2,091)	28,614	(6,173)	11,274
Tax effect	577	(7,987)	1,701	(3,162)
Net of tax	(1,514)	20,627	(4,472)	8,112
Reclassification of net losses included in net income:
Before tax	0	(14,285)	0	(14,285)
Tax effect	0	4,000	0	4,000
Net of tax	0	(10,285)	0	(10,285)
Net unrealized holding (losses) gains	(1,514)	10,342	(4,472)	(2,173)
Total other comprehensive (loss) income	(19,440)	(2,978)	(51,760)	27,703
Total comprehensive income (loss)	$ 35,423	$ 24,645	$ 99,247	$ 93,996

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income - AOCI - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 2,690,006	$ 2,370,793
Ending balance	2,723,223	2,664,171
Accumulated Unrealized Gain (Loss) on Securities Available- for-Sale
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	38,328	15,808
Other comprehensive income (loss)	(47,288)	29,876
Ending balance	(8,960)	45,684
Accumulated Unrealized Gain (Loss) on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	10,179	819
Other comprehensive income (loss)	(4,472)	(2,173)
Ending balance	5,707	(1,354)
Unrecognized Net Pension Costs
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(22,128)	(18,581)
Other comprehensive income (loss)	0	0
Ending balance	(22,128)	(18,581)
Total Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	26,379	(1,954)
Other comprehensive income (loss)	(51,760)	27,703
Ending balance	$ (25,381)	$ 25,749

Consolidated Statements of Chan

Consolidated Statements of Changes In Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Adjustment to apply recent accounting pronouncements	[1]	Common Shares Outstanding	Preferred Stock	Additional Paid-in Capital	Retained Earnings	Retained EarningsAdjustment to apply recent accounting pronouncements	[1]	Total Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2019				109,972
Beginning balance at Dec. 31, 2019	$ 2,370,793	$ (26,821)		$ 1,204	$ 0	$ 1,211,274	$ 1,380,612	$ (26,821)		$ (1,954)	$ (220,343)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	66,293						66,293
Other comprehensive income (loss)	27,703									27,703
Preferred dividends	(5,070)						(5,070)
Common dividends declared	(48,028)						(48,028)
Repurchases of common stock (in shares)				(1,171)
Repurchases of common stock	(22,557)										(22,557)
Acquisitions, net of issuance costs (in shares)				4,930
Acquisition, net of issuance costs	71,883			$ 49		71,834
Preferred stock issued	221,047				230,500	(9,453)
Common stock issued (in shares)				49
Common stock issued	1,007			$ 1		327					679
Restricted stock activity (in shares)				531
Restricted stock activity	(3,063)					(13,311)					10,248
Treasury stock issued to benefit plans	(258)					(54)					(204)
Share-based compensation expense (in shares)				(18)
Share-based compensation expense	11,242					11,242
Ending balance (in shares) at Sep. 30, 2020				114,293
Ending balance at Sep. 30, 2020	2,664,171			$ 1,254	230,500	1,271,859	1,366,986			25,749	(232,177)
Beginning balance (in shares) at Jun. 30, 2020				114,276
Beginning balance at Jun. 30, 2020	2,656,211			$ 1,253	230,500	1,268,647	1,359,407			28,727	(232,323)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27,623						27,623
Other comprehensive income (loss)	(2,978)									(2,978)
Preferred dividends	(4,033)						(4,033)
Common dividends declared	(16,011)						(16,011)
Preferred stock issued	(265)					(265)
Common stock issued (in shares)				6
Common stock issued	77			$ 1		76
Restricted stock activity (in shares)				18
Restricted stock activity	72					(131)					203
Treasury stock issued to benefit plans (in shares)				11
Treasury stock issued to benefit plans	(90)					(33)					(57)
Share-based compensation expense (in shares)				(18)
Share-based compensation expense	3,565					3,565
Ending balance (in shares) at Sep. 30, 2020				114,293
Ending balance at Sep. 30, 2020	$ 2,664,171			$ 1,254	230,500	1,271,859	1,366,986			25,749	(232,177)
Beginning balance (in shares) at Dec. 31, 2020	114,296			114,296
Beginning balance at Dec. 31, 2020	$ 2,690,006			$ 1,254	230,500	1,275,492	1,388,525			26,379	(232,144)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	151,007						151,007
Other comprehensive income (loss)	(51,760)									(51,760)
Preferred dividends	(12,101)						(12,101)
Common dividends declared	(47,950)						(47,950)
Repurchases of common stock (in shares)				(715)
Repurchases of common stock	(14,929)										(14,929)
Acquisition, net of issuance costs	0
Common stock issued (in shares)				73
Common stock issued	1,173			$ 0		129					1,044
Restricted stock activity (in shares)				500
Restricted stock activity	(4,031)					(14,047)					10,016
Treasury stock issued to benefit plans (in shares)				13
Treasury stock issued to benefit plans	269					35					234
Share-based compensation expense	$ 11,539					11,539
Ending balance (in shares) at Sep. 30, 2021	114,167			114,167
Ending balance at Sep. 30, 2021	$ 2,723,223			$ 1,254	230,500	1,273,148	1,479,481			(25,381)	(235,779)
Beginning balance (in shares) at Jun. 30, 2021				114,177
Beginning balance at Jun. 30, 2021	2,704,148			$ 1,254	230,500	1,269,192	1,444,625			(5,941)	(235,482)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	54,863						54,863
Other comprehensive income (loss)	(19,440)									(19,440)
Preferred dividends	(4,033)						(4,033)
Common dividends declared	(15,974)						(15,974)
Common stock issued (in shares)				4
Common stock issued	74					73					1
Restricted stock activity (in shares)				(26)
Restricted stock activity	(29)					487					(516)
Treasury stock issued to benefit plans (in shares)				12
Treasury stock issued to benefit plans	232					14					218
Share-based compensation expense	$ 3,382					3,382
Ending balance (in shares) at Sep. 30, 2021	114,167			114,167
Ending balance at Sep. 30, 2021	$ 2,723,223			$ 1,254	$ 230,500	$ 1,273,148	$ 1,479,481			$ (25,381)	$ (235,779)
[1]	As a result of accounting guidance adopted in the first quarter of 2020, a portion of the increase in allowance for credit losses, net of tax, was recognized as a cumulative-effect adjustment to retained earnings as of January 1, 2020.

Consolidated Statements of Ch_2

Consolidated Statements of Changes In Stockholders' Equity (Parentheticals) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share (in dollars per share)	$ 0.14	$ 0.14	$ 0.42	$ 0.42

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating Activities
Net income	$ 151,007,000	$ 66,293,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	6,098,000	88,108,000
Depreciation of premises, furniture, and equipment	11,149,000	12,540,000
Net amortization of premium on securities	15,465,000	16,203,000
Net securities gains	0	(13,323,000)
Gains on sales of 1-4 family mortgages and corporate loans held-for-sale	(22,205,000)	(14,091,000)
Net (gains) losses on sales and valuation adjustments of OREO	(141,000)	221,000
Amortization of the FDIC indemnification asset	0	892,000
Net (gains) losses on sales and valuation adjustments of premises, furniture, and equipment	(1,103,000)	9,033,000
BOLI income	(5,222,000)	(5,503,000)
Share-based compensation expense	11,539,000	11,242,000
Tax benefit related to share-based compensation	377,000	271,000
Amortization of other intangible assets	8,398,000	8,400,000
Originations of mortgage loans held-for-sale	(664,682,000)	(592,196,000)
Proceeds from sales of mortgage loans held-for-sale	713,775,000	551,105,000
Net increase in equity securities	(38,444,000)	(12,885,000)
Net decrease (increase) in accrued interest receivable and other assets	44,031,000	(111,925,000)
Net (decrease) increase in accrued interest payables and other liabilities	(7,508,000)	80,487,000
Net cash provided by operating activities	222,534,000	94,872,000
Investing Activities
Proceeds from maturities, repayments, and calls of securities available-for-sale	774,225,000	986,145,000
Proceeds from sales of securities available-for-sale	34,834,000	281,869,000
Purchases of securities available-for-sale	(1,006,329,000)	(1,499,176,000)
Proceeds from maturities, repayments, and calls of securities held-to-maturity	1,218,000	9,934,000
Purchases of securities held-to-maturity	0	(10,050,000)
Net sales (purchases) of FHLB stock	11,330,000	(22,711,000)
Net increase in loans	(74,022,000)	(1,078,458,000)
Premiums paid on BOLI, net of proceeds from claims	5,936,000	3,922,000
Proceeds from sales of OREO	3,288,000	3,709,000
Proceeds from sales of premises, furniture, and equipment	3,908,000	1,132,000
Purchases of premises, furniture, and equipment	(5,321,000)	(7,680,000)
Net cash received from acquisition	0	142,282,000
Net cash used in investing activities	(250,933,000)	(1,189,082,000)
Financing Activities
Net increase in deposit accounts	1,185,938,000	1,570,219,000
Net (decrease) increase in borrowed funds	(271,842,000)	286,890,000
Swap termination costs	0	(14,285,000)
Net proceeds from the issuance of preferred stock	0	221,047,000
Repurchases of common stock	(14,929,000)	(22,557,000)
Cash dividends paid	(60,088,000)	(52,522,000)
Restricted stock activity	(2,987,000)	(3,063,000)
Net cash provided by financing activities	836,092,000	1,985,729,000
Net increase in cash and cash equivalents	807,693,000	891,519,000
Cash and cash equivalents at beginning of period	1,117,244,000	299,221,000
Cash and cash equivalents at end of period	1,924,937,000	1,190,740,000
Supplemental Disclosures of Cash Flow Information:
Income taxes paid	41,507,000	40,012,000
Interest paid to depositors and creditors	31,134,000	65,198,000
Dividends declared, but unpaid	15,825,000	15,859,000
Stock issued for acquisitions, net of issuance costs	0	71,883,000
Non-cash transfers of loans to OREO	0	121,000
Non-cash transfers of loans held-for-investment to (from) loans held-for-sale	$ 14,875,000
Non-cash transfers of loans held-for-investment to (from) loans held-for-sale		$ (243,000)

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation – The accompanying unaudited condensed consolidated interim financial statements ("consolidated financial statements") of First Midwest Bancorp, Inc. (the "Company"), a Delaware corporation, were prepared in accordance with the rules and regulations of the Securities and Exchange Commission ("SEC") for quarterly reports on Form 10-Q and reflect all adjustments that management deems necessary for the fair presentation of the financial position and results of operations for the periods presented. The results of operations for the quarter and nine months ended September 30, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021. The accounting and reporting policies of the Company and its subsidiaries conform to U.S. generally accepted accounting principles ("GAAP") and general practices within the banking industry. The accompanying consolidated financial statements do not include certain information and note disclosures required by GAAP for complete annual financial statements. Therefore, these financial statements should be read in conjunction with the Company's 2020 Annual Report on Form 10-K ("2020 10-K"). The Company uses the accrual basis of accounting for financial reporting purposes. Certain reclassifications were made to prior year amounts to conform to the current year presentation. Use of Estimates – The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Although these estimates and assumptions are based on the best available information, actual results could differ from those estimates. Principles of Consolidation – The accompanying consolidated financial statements include the financial position and results of operations of the Company and its subsidiaries after elimination of all significant intercompany accounts and transactions. Assets held in a fiduciary or agency capacity are not assets of the Company or its subsidiaries and are not included in the consolidated financial statements. The accounting policies related to business combinations, loans, the allowance for credit losses, and derivative financial instruments are presented below. For a summary of all other significant accounting policies, see Note 1, "Summary of Significant Accounting Policies," in the Company's 2020 10-K. Business Combinations – Business combinations are accounted for under the acquisition method of accounting. Assets acquired and liabilities assumed are recorded at their estimated fair values as of the date of acquisition, with any excess of the purchase price of the acquisition over the fair value of the identifiable net tangible and intangible assets acquired recorded as goodwill. Alternatively, a gain is recorded if the fair value of assets purchased exceeds the fair value of liabilities assumed and consideration paid. The results of operations of the acquired business are included in the Condensed Consolidated Statements of Income from the effective date of the acquisition. Loans – Loans held-for-investment are loans that the Company intends to hold until they are paid in full and are carried at the principal amount outstanding, including certain net deferred loan origination fees. Loan origination fees, commitment fees, and certain direct loan origination costs are deferred, and the net amount is amortized as a yield adjustment over the contractual life of the related loans or commitments and included in interest income. Fees related to letters of credit are amortized into fee income over the contractual life of the commitment. Other credit-related fees are recognized as fee income when earned. The Company's net investment in direct financing leases is included in loans and consists of future minimum lease payments and estimated residual values, net of unearned income. Interest income on loans is accrued based on principal amounts outstanding. Loans held-for-sale are carried at the lower of aggregate cost or fair value and included in other assets in the Consolidated Statements of Financial Condition. Acquired Loans – Acquired loans consist of all loans acquired in business combinations and are included within loans held-for-investment. Acquired loans are separated into (i) non-purchased credit deteriorated ("non-PCD") loans and (ii) purchased credit deteriorated ("PCD") loans. Non-PCD loans include loans that did not have evidence of more-than-insignificant credit deterioration since origination at the acquisition date. PCD loans include loans that had evidence of more-than-insignificant credit deterioration since origination. Evidence of credit deterioration was evaluated using various indicators, such as past due and non-accrual status. Leases and revolving loans do not qualify to be accounted for as PCD loans and are accounted for as non-PCD loans. The acquisition adjustment related to non-PCD loans is amortized into interest income over the contractual life of the related loans. If an acquired non-PCD loan is renewed subsequent to the acquisition date, any remaining acquisition adjustment is accreted into interest income and the loan is considered a new loan that is no longer classified as an acquired loan. PCD loans are generally accounted for based on estimates of expected future cash flows. The Company uses a discounted cash flow analysis involving significant unobservable inputs and assumptions to measure the fair value of PCD loans. The significant assumptions utilized in the cash flow analysis include the probability of default ("PD"), loss given default ("LGD"), and discount rate. PCD loans are recorded at fair value, excluding credit-related adjustments, for which an allowance for loan losses is established at the acquisition date through purchase accounting adjustments. Expected future cash flows in excess of the fair value of loans at the purchase date ("accretable yield") are recorded as interest income over the life of the loans if the timing and amount of the expected future cash flows can be reasonably estimated. Subsequent to the acquisition date, the allowance for loan losses on PCD loans is estimated as are the allowances for all other loans in the portfolio. 90-Days Past Due Loans – The Company's accrual of interest on loans is generally discontinued at the time the loan is 90 days past due unless the credit is sufficiently collateralized and in the process of renewal or collection. Non-accrual Loans – Generally, corporate loans are placed on non-accrual status (i) when either principal or interest payments become 90 days or more past due unless the credit is sufficiently collateralized and in the process of renewal or collection, or (ii) when an individual analysis of a borrower's creditworthiness warrants a downgrade to non-accrual regardless of past due status. When a loan is placed on non-accrual status, unpaid interest credited to income in the current year is reversed, and unpaid interest accrued in prior years is charged against the allowance for loan losses. After the loan is placed on non-accrual status, all debt service payments are applied to the principal on the loan. Future interest income may only be recorded on a cash basis after recovery of principal is reasonably assured. Non-accrual loans are returned to accrual status when the financial position of the borrower and other relevant factors indicate that the Company will collect all principal and interest. Non-accrual loans with balances under a specified threshold are not individually evaluated for impairment. For all other non-accrual loans, impairment is measured by comparing the estimated value of the loan to the recorded book value. The value of collateral-dependent loans is based on the fair value of the underlying collateral, less costs to sell. The value of other loans is measured using the present value of expected future cash flows discounted at the loan's effective interest rate. Commercial loans and loans secured by real estate are charged-off when deemed uncollectible. A loss is recorded if the net realizable value of the underlying collateral is less than the outstanding principal and interest. Consumer loans that are not secured by real estate are subject to mandatory charge-off at a specified delinquency date and are usually not classified as non-accrual prior to being charged-off. Closed-end consumer loans, which include installment, consumer secured, and single payment loans, are usually charged-off no later than the end of the month in which the loan becomes 120 days past due. Troubled Debt Restructurings ( " TDR s" ) – A restructuring is considered a TDR when (i) the borrower is experiencing financial difficulties, and (ii) the creditor grants a concession, such as forgiveness of principal, reduction of the interest rate, changes in payments, or extension of the maturity date. Loans are not classified as TDRs when the modification is short-term or results in an insignificant delay in payments. The Company's TDRs are determined on a case-by-case basis. The Company does not accrue interest on a TDR unless it believes collection of all principal and interest under the modified terms is reasonably assured. For a TDR to begin accruing interest, the borrower must demonstrate some level of past performance and the future capacity to perform under the modified terms. Generally, six months of consecutive payment performance under the restructured terms is required before a TDR is returned to accrual status. However, the period could vary depending on the individual facts and circumstances of the loan. An evaluation of the borrower's current creditworthiness is used to assess the borrower's capacity to repay the loan under the modified terms. This evaluation includes an estimate of expected future cash flows, evidence of strong financial position, and estimates of the value of collateral, if applicable. For TDRs to be removed from TDR status in the calendar year after the restructuring, the loans must (i) have an interest rate and terms that reflect market conditions at the time of restructuring, and (ii) be in compliance with the modified terms. If the loan was restructured at below market rates and terms, it continues to be separately reported as restructured until it is paid in full or charged-off. Allowance for Credit Losses – The allowance for credit losses is comprised of the allowance for loan losses and the allowance for unfunded commitments and is maintained by management at a level believed adequate to absorb current expected credit losses in the existing loan portfolio. Determination of the allowance for credit losses is subjective since it requires significant estimates and management judgment, including the amounts and timing of expected future cash flows, actual loss experience, consideration of current national, regional, and local economic trends and conditions, reasonable and supportable forecasts about the future, changes in interest rates and property values, various internal and external qualitative factors, and other factors. Loans deemed to be uncollectible are charged-off against the allowance for loan losses, while recoveries of amounts previously charged-off are credited to the allowance for loan losses. Additions to the allowance for loan losses are charged to expense through the provision for loan losses. The amount of provision depends on a number of factors, including net charge-off levels, loan growth, changes in the composition of the loan portfolio, and the Company's assessment of the allowance for loan losses based on the methodology discussed below. Allowance for Loan Losses – The allowance for loan losses consists of (i) specific allowance for individual loans where the recorded investment exceeds the value, (ii) an allowance based on historical credit loss experience with consideration of reasonable and supportable forecasts of economic conditions for each loan category, and (iii) an allowance based on other internal and external qualitative factors. The allowance for individual loans is based on a periodic analysis of non-accrual loans individually exceeding a specific dollar amount. If the estimated value of a non-accrual loan is less than its recorded book value, the Company either (i) provides an allowance in the amount of the excess of the book value over the estimated value of the related loan or, (ii) if the loss is confirmed, charges off the loss. The allowance by loan category is based on a discounted cash flows analysis as future cash flows are discounted at an effective rate of return. In addition, estimates of losses on future cash flows is forecasted by applying probability of default and loss given default factors as well as prepayment and curtailment assumptions to cash flows that are adjusted to a present value. This discounted cash flow analysis is updated quarterly, primarily using actual loss experience adjusted for current reasonable and supportable forecasts of economic conditions over a one-year forecast period. After the one-year forecast period, a one-year reversion period adjusts loss experience to the historical average on a straight-line basis. These forecasts consider multiple scenarios of key assumptions including national unemployment rates, housing price indices, and gross domestic product. This general allowance component is then adjusted based on management's consideration of many internal and external qualitative factors, including: • Changes in the composition of the loan portfolio, trends in the volume of loans, and trends in delinquent and non-accrual loans that could indicate that historical trends do not reflect current conditions. • Changes in credit policies and procedures, such as underwriting standards and collection, charge-off, and recovery practices. • Changes in the experience, ability, and depth of credit management and other relevant staff. • Changes in the quality of the Company's loan review system and Board of Directors oversight. • The effect of any concentration of credit and changes in the level of concentrations, such as loan type or risk rating. • Changes in the value of the underlying collateral for collateral-dependent loans. • Changes in the national, regional, and local economy that affect the collectability of various segments of the portfolio. • The effect of other external factors, such as competition and legal and regulatory requirements, on the Company's loan portfolio. The allowance for loan losses also includes an allowance on acquired non-PCD and PCD loans. An allowance for loan losses is recorded on acquired PCD loans at the acquisition date through purchase accounting adjustments. Subsequent to the acquisition date, the allowance for loan losses on PCD loans is estimated as are the allowances for all other loans in the portfolio. No allowance for loan losses is recorded on acquired non-PCD loans at the acquisition date through purchase accounting. Instead, an allowance is established on acquired non-PCD loans at the acquisition date in-line with all other loans in the portfolio as if the loans were originated at the acquisition date. On a periodic basis, the adequacy of this allowance is determined using either a PD/LGD methodology or a specific review methodology. Allowance for Unfunded Commitments – The Company also maintains an allowance for unfunded commitments, including letters of credit, for the risk of loss inherent in these arrangements. The allowance for unfunded commitments is estimated using the historical credit loss experience with consideration of reasonable and supportable forecasts of economic conditions for each loan category. The allowance for unfunded commitments is included in other liabilities in the Consolidated Statements of Financial Condition. The establishment of the allowance for credit losses involves a high degree of judgment and estimation given the difficulty of assessing the factors impacting loan repayment and estimating the timing and amount of losses. While management utilizes its best judgment and information available, the adequacy of the allowance for credit losses depends on a variety of factors beyond the Company's control, including the performance of its loan portfolio, current national, regional, and local economic trends, reasonable and supportable forecasts about the future, changes in interest rates and property values, the amounts and timing of expected future cash flows on non-accrual loans, estimated losses on pools of homogenous loans, the interpretation of loan risk classifications by regulatory authorities, various internal and external qualitative factors, and other factors. Derivative Financial Instruments – To provide derivative products to customers and in the ordinary course of business, the Company enters into derivative transactions as part of its overall interest rate risk management strategy to minimize significant unplanned fluctuations in earnings and expected future cash flows caused by interest rate volatility. All derivative instruments are recorded at fair value as either other assets or other liabilities in the Consolidated Statements of Financial Condition. Subsequent changes in a derivative's fair value are recognized in earnings unless specific hedge accounting criteria are met. On the date the Company enters into a derivative contract, the derivative is designated as a fair value hedge, a cash flow hedge, or a non-hedge derivative instrument. Fair value hedges are designed to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk. Cash flow hedges are designed to mitigate exposure to variability in expected future cash flows to be received or paid related to an asset, liability, or other type of forecasted transaction. The Company formally documents all relationships between hedging instruments and hedged items, including its risk management objective and strategy, at inception. At the hedge's inception, a formal assessment is performed to determine the effectiveness of the derivative in offsetting changes in the fair values or expected future cash flows of the hedged items in the current period and prospectively. If a derivative instrument designated as a hedge is terminated or ceases to be highly effective, hedge accounting is discontinued prospectively, and the gain or loss is amortized into earnings. For fair value hedges, the gain or loss is amortized over the remaining life of the hedged asset or liability. For cash flow hedges, the gain or loss is amortized over the same period that the forecasted hedged transactions impact earnings. If the hedged item is disposed of, any fair value adjustments are included in the gain or loss from the disposition of the hedged item. If the forecasted transaction is no longer probable, the gain or loss is included in earnings immediately. For fair value hedges, changes in the fair value of the derivative instruments, as well as changes in the fair value of the hedged item, are recognized in earnings in the same income statement line item as the earnings effect of the hedged item. For cash flow hedges, the effective portion of the change in fair value of the derivative instrument is reported as a component of accumulated other comprehensive income (loss) and is reclassified to earnings when the hedged transaction is reflected in earnings.

Recent Accounting Pronouncement

Recent Accounting Pronouncements and Other Guidance	9 Months Ended
	Sep. 30, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recent Accounting Pronouncements and Other Guidance	RECENT ACCOUNTING PRONOUNCEMENTS AND OTHER GUIDANCE Adopted Accounting Pronouncements Changes to the Disclosure Requirements for Defined Benefit Plans: In August of 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") 2018-14 that makes minor changes and clarifications to the disclosure requirements for entities that sponsor defined benefit plans. This guidance is effective for annual and interim periods beginning after December 15, 2020. The adoption of this guidance on January 1, 2021 did not materially impact the Company's financial condition, results of operations, or liquidity. Income Taxes : In December of 2019, the FASB issued ASU 2019-12 that removes certain exceptions to the general principles of accounting for income taxes. This guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. The adoption of this guidance on January 1, 2021 did not materially impact the Company's financial condition, results of operations, or liquidity. Accounting Pronouncements Pending Adoption Reference Rate Reform : In March of 2020, the FASB issued ASU 2020-04 and in January of 2021, the FASB issued 2021-01, both of which provide optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued by reference rate reform, if certain criteria are met. This guidance is effective upon issuance as of March 12, 2020 and generally can be applied through December 31, 2022. Management continues to monitor efforts and evaluate the impact of reference rate reform, including this guidance and determining its impact on the Company's financial condition, results of operations, and liquidity.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Acquisitions	ACQUISITIONS Pending Merger On June 1, 2021, the Company and Old National Bancorp ("Old National"), the holding company for Old National Bank, jointly announced that they entered into a definitive merger agreement to combine in an all-stock merger of equals transaction to create a premier Midwestern bank with approximately $45 billion of combined assets. The merger agreement provides for a fixed exchange ratio whereby holders of Company common stock will receive 1.1336 shares of Old National common stock for each share of Company common stock they own, other than certain shares held by the Company or Old National. In addition, the merger agreement provides that holders of Company depositary shares representing a 1/40th interest in a share of the Company's 7.000% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A or Series C, will receive an equal amount of Old National depositary shares each representing a 1/40th interest in a share of a corresponding new series of Old National preferred stock having terms that are not materially less favorable than the Company preferred stock. The headquarters of the surviving corporation and the main office of the surviving bank will be located in Evansville, Indiana and the name of the surviving corporation and surviving bank will be Old National Bancorp and Old National Bank, respectively. The Commercial Banking and Consumer Banking operations of the surviving bank will be headquartered in Chicago, Illinois. Michael L. Scudder, Chairman and Chief Executive Officer ("CEO") of the Company, will serve as the Executive Chairman, and James C. Ryan III, Chairman and CEO of Old National Bancorp, will maintain his role as CEO. The merger agreement has been unanimously approved by the boards of directors, and has also been approved by approximately 99% of the votes cast at the shareholder meetings, of both companies. As of the date of announcement, the overall transaction market value was approximately $6.5 billion. On August 19, 2021, the Office of the Comptroller of the Currency approved the application for the merger of First Midwest Bank and Old National Bank. Completion of the merger remains subject to regulatory approval by the Board of Governors of the Federal Reserve System and certain other customary closing conditions set forth in the merger agreement. Completed Acquisition Park Bank On March 9, 2020, the Company completed its acquisition of Bankmanagers Corp. ("Bankmanagers"), the holding company for Park Bank, based in Milwaukee, Wisconsin. At closing, the Company acquired $1.2 billion of assets, $1.0 billion of deposits, and $687.9 million of loans, net of fair value adjustments. Under the terms of the merger agreement, on March 9, 2020, each outstanding share of Bankmanagers common stock was exchanged for 29.9675 shares of Company common stock, plus $623.02 of cash (of which $346.00 per share was paid by Bankmanagers to its shareholders by a special cash dividend immediately prior to closing). This resulted in merger consideration of $174.4 million, which consisted of 4.9 million shares of Company common stock and $102.5 million of cash. Goodwill of $59.6 million associated with the acquisition was recorded by the Company. All Park Bank operating systems were converted to the Company's operating platform during the second quarter of 2020. During the first quarter of 2021, the Company finalized the fair value adjustments associated with the Bankmanagers transaction, which required measurement period adjustments to goodwill. These adjustments were recognized in the current period in accordance with accounting guidance applicable to business combinations. The following table presents the assets acquired and liabilities assumed, net of the fair value adjustments, in the Park Bank transaction as of the acquisition date. The assets acquired and liabilities assumed, both intangible and tangible, were recorded at their estimated fair values as of the acquisition date and have been accounted for under the acquisition method of accounting. Acquisition Activity (Dollar amounts in thousands, except share and per share data) Park Bank March 9, 2020 Assets Cash and due from banks and interest-bearing deposits in other banks $ 244,781 Securities available-for-sale 136,856 Securities held-to-maturity 300 Loans 687,923 OREO 2,276 Goodwill 59,649 Other intangible assets 3,068 Premises, furniture, and equipment 2,550 Accrued interest receivable and other assets 13,502 Total assets $ 1,150,905 Liabilities Noninterest-bearing deposits $ 356,050 Interest-bearing deposits 594,026 Total deposits 950,076 Borrowed funds 11,532 Accrued interest payable and other liabilities 14,915 Total liabilities 976,523 Consideration Paid Common stock (2020 – 4,930,231, shares issued at $14.58 per share) 71,883 Cash paid 102,499 Total consideration paid 174,382 $ 1,150,905

Securities

Securities	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Securities	SECURITIES The significant accounting policies related to securities are presented in Note 1, "Summary of Significant Accounting Policies" to the Consolidated Financial Statements in the Company's 2020 10-K. A summary of the Company's securities portfolio by category and maturity is presented in the following tables. Securities Portfolio (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 Amortized Cost Gross Unrealized Fair Amortized Cost Gross Unrealized Fair Gains Losses Gains Losses Securities Available-for-Sale U.S. treasury securities $ — $ — $ — $ — $ 12,001 $ 50 $ — $ 12,051 U.S. agency securities 675,866 1,434 (21,188) 656,112 654,321 3,129 (4,976) 652,474 Collateralized mortgage obligations 1,304,762 11,633 (20,851) 1,295,544 1,415,312 27,529 (4,323) 1,438,518 Other mortgage-backed securities 854,852 8,170 (6,926) 856,096 566,830 14,650 (640) 580,840 Municipal securities 216,744 8,776 (902) 224,618 224,446 11,573 (4) 236,015 Corporate debt securities 173,061 7,477 — 180,538 170,570 6,210 (270) 176,510 Total securities available-for-sale $ 3,225,285 $ 37,490 $ (49,867) $ 3,212,908 $ 3,043,480 $ 63,141 $ (10,213) $ 3,096,408 Securities Held-to-Maturity Municipal securities $ 10,853 $ — $ (392) $ 10,461 $ 12,291 $ — $ (385) $ 11,906 Allowance for securities held-to- (220) $ (220) (220) $ (220) Total securities held-to-maturity, $ 10,633 $ — $ (392) $ 10,241 $ 12,071 $ — $ (385) $ 11,686 Equity Securities $ 114,848 $ 76,404 Accrued interest receivable on the securities portfolio totaled $10.4 million and $11.9 million as of September 30, 2021 and December 31, 2020, respectively, and is included in accrued interest receivable and other assets in the Consolidated Statements of Financial Condition. Accounting guidance requires that the credit portion of a decline in fair value be recognized as an allowance for credit losses, established as a charge to expense through income. If a decline in fair value below carrying value is not attributable to credit deterioration and the Company does not intend to sell the security or believe it would not be more likely than not required to sell the security prior to recovery, the Company records the non-credit related portion of the decline in fair value in other comprehensive income (loss). In determining whether a decline in fair value of a security is credit related, the Company considers adverse conditions specific to the security, deterioration in economic conditions or market environment that may affect the value of the securities and related collateral, if any, events of default, changes to the credit rating of the security by a rating agency, and guarantees applicable to the security, among other factors. Remaining Contractual Maturity of Securities (Dollar amounts in thousands) As of September 30, 2021 Available-for-Sale Held-to-Maturity Amortized Fair Amortized Fair One year or less $ 115,656 $ 115,178 $ 1,857 $ 1,790 After one year to five years 157,219 156,570 4,495 4,333 After five years to ten years 792,796 789,520 1,953 1,882 After ten years — — 2,548 2,456 Securities that do not have a single contractual maturity date 2,159,614 2,151,640 — — Total $ 3,225,285 $ 3,212,908 $ 10,853 $ 10,461 The carrying value of securities available-for-sale that were pledged to secure deposits or for other purposes as permitted or required by law totaled $2.1 billion as of September 30, 2021 and $1.6 billion as of December 31, 2020. No securities held-to-maturity were pledged as of September 30, 2021 or December 31, 2020. There were no material realized gains (losses) on securities available-for-sale for the quarters ended September 30, 2021 and the nine months ended September 30, 2021. There were $14.3 million and $13.3 million of realized gains for the quarter and nine months ended September 30, 2020. The following table presents the aggregate amount of unrealized losses and the aggregate related fair values of securities with unrealized losses as of September 30, 2021 and December 31, 2020. Securities in an Unrealized Loss Position (Dollar amounts in thousands) Less Than 12 Months 12 Months or Longer Total Number of Fair Unrealized Fair Unrealized Fair Unrealized As of September 30, 2021 Securities Available-for-Sale U.S. agency securities 74 $ 331,843 $ 10,834 $ 216,769 $ 10,354 $ 548,612 $ 21,188 CMOs 178 666,381 13,271 139,952 7,580 806,333 20,851 MBSs 85 349,060 5,751 59,373 1,175 408,433 6,926 Municipal securities 30 21,497 742 5,824 160 27,321 902 Total 367 $ 1,368,781 $ 30,598 $ 421,918 $ 19,269 $ 1,790,699 $ 49,867 As of December 31, 2020 Securities Available-for-Sale U.S. agency securities 48 $ 253,841 $ 4,764 $ 14,932 $ 212 $ 268,773 $ 4,976 CMOs 104 349,853 3,205 86,618 1,118 436,471 4,323 MBSs 19 69,838 550 12,307 90 82,145 640 Municipal securities 4 1,012 4 — — 1,012 4 Corporate debt securities 3 8,100 105 9,513 165 17,613 270 Total 178 $ 682,644 $ 8,628 $ 123,370 $ 1,585 $ 806,014 $ 10,213 Substantially all of the Company's CMOs and other MBSs are either backed by U.S. government-owned agencies or issued by U.S. government-sponsored enterprises. Municipal securities are issued by municipal authorities, and the majority are supported by third-party insurance or some other form of credit enhancement. Management does not believe any of these securities with unrealized losses as of September 30, 2021 represent impairment related to credit deterioration. These unrealized losses are attributed to changes in interest rates and temporary market movements. The Company does not intend to sell these securities and it is not more likely than not that the Company will be required to sell them before recovery of their amortized cost basis, which may be at maturity.

Loans

Loans	9 Months Ended
	Sep. 30, 2021
Loans and Leases Receivable Disclosure [Abstract]
Loans	LOANS Loans Held-for-Investment The following table presents the Company's loans held-for-investment by class. Loan Portfolio (Dollar amounts in thousands) As of September 30, December 31, Commercial and industrial $ 4,705,458 $ 4,578,254 Agricultural 349,159 364,038 Commercial real estate: Office, retail, and industrial 1,765,592 1,861,768 Multi-family 1,082,941 872,813 Construction 595,204 612,611 Other commercial real estate 1,408,955 1,481,976 Total commercial real estate 4,852,692 4,829,168 Total corporate loans, excluding Paycheck Protection Program ("PPP") loans 9,907,309 9,771,460 PPP loans 384,100 785,563 Total corporate loans 10,291,409 10,557,023 Home equity 591,126 761,725 1-4 family mortgages 3,332,732 3,022,413 Installment 573,465 410,071 Total consumer loans 4,497,323 4,194,209 Total loans $ 14,788,732 $ 14,751,232 Deferred loan fees included in total loans $ 8,688 $ 9,696 Overdrawn demand deposits included in total loans 8,562 8,444 Accrued interest receivable on the loan portfolio totaled $51.6 million and $56.7 million as of September 30, 2021 and December 31, 2020, respectively and is included in accrued interest receivable and other assets in the Consolidated Statements of Financial Condition. The Company primarily lends to community-based and mid-sized businesses, commercial real estate customers, and consumers in its markets. Within these areas, the Company diversifies its loan portfolio by loan type, industry, and borrower. It is the Company's policy to review each prospective credit to determine the appropriateness and the adequacy of security or collateral prior to making a loan. In the event of borrower default, the Company seeks recovery in compliance with state lending laws, the Company's lending standards, and credit monitoring and remediation procedures. A discussion of risk characteristics relevant to each portfolio segment is presented in Note 5, "Loans" to the Consolidated Financial Statements in the Company's 2020 10-K. Loan Sales The following table presents loan sales and purchases for the quarters and nine months ended September 30, 2021 and 2020. Loan Sales and Purchases (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2021 2020 2021 2020 Corporate loan sales Proceeds from sales $ — $ 50 $ 17,227 $ 4,648 Less book value of loans sold — 65 17,177 4,542 Net (losses) gains on corporate loan sales (1) — (15) 50 106 1-4 family mortgage loan sales Proceeds from sales 205,699 258,695 713,775 551,105 Less book value of loans sold 199,938 251,819 691,620 537,120 Net gains on 1-4 family mortgage loan sales (2) 5,761 6,876 22,155 13,985 Total net gains on loan sales $ 5,761 $ 6,861 $ 22,205 $ 14,091 Corporate loan purchases (3) Commercial and industrial $ 65,633 $ 10,196 $ 299,708 $ 178,912 Office, retail, and industrial 1,198 — 8,636 — Multi-family 7 — 26,136 — Construction 5 3,692 1,041 7,589 Other commercial real estate — — 35,000 10,000 Total corporate loan purchases $ 66,843 $ 13,888 $ 370,521 $ 196,501 Consumer loan purchases Home equity $ — $ — $ — $ 144,967 1-4 family mortgages 186,910 168,052 772,828 417,637 Installment — — 253,376 — Total consumer loan purchases $ 186,910 $ 168,052 $ 1,026,204 $ 562,604 (1) Net gains on corporate loan sales are included in other service charges, commissions, and fees in the Condensed Consolidated Statements of Income. (2) Net gains on 1-4 family mortgage loan sales are included in mortgage banking income in the Condensed Consolidated Statements of Income. (3) Consists of the Company's portion of loan participations purchased. The Company retained servicing responsibilities for a portion of the 1-4 family mortgage loans sold and collects servicing fees equal to a percentage of the outstanding principal balance. For additional disclosure related to the Company's obligations resulting from the sale of certain 1-4 family mortgage loans, see Note 13, "Commitments, Guarantees, and Contingent Liabilities."

Acquired Loans

Acquired Loans	9 Months Ended
	Sep. 30, 2021
Transfers and Servicing [Abstract]
Acquired Loans	ACQUIRED LOANS The significant accounting policies related to acquired loans, which are classified as PCD and non-PCD at September 30, 2021 and December 31, 2020, are presented in Note 1, "Summary of Significant Accounting Policies." The following table presents the carrying amount of acquired loans as of September 30, 2021 and December 31, 2020. Acquired Loans (1) (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 PCD Non-PCD Total PCD Non-PCD Total Acquired loans $ 161,154 $ 787,636 $ 948,790 $ 212,021 $ 1,198,818 $ 1,410,839 (1) Included in loans in the Consolidated Statements of Financial Condition. The outstanding balance of PCD loans was $206.2 million as of September 30, 2021 and $247.3 million as of December 31, 2020.

Past Due Loans, Allowance For C

Past Due Loans, Allowance For Credit Losses, Non-Accrual Loans, and TDRS	9 Months Ended
	Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Past Due Loans, Allowance For Credit Losses, Non-Accrual Loans, and TDRS	PAST DUE LOANS, ALLOWANCE FOR CREDIT LOSSES, NON-ACCRUAL LOANS, AND TDRS Past Due and Non-accrual Loans The following table presents an aging analysis of the Company's past due loans as of September 30, 2021 and December 31, 2020 with balances presented on an amortized cost basis. The aging is determined without regard to accrual status. The table also presents non-performing loans, consisting of non-accrual loans (the majority of which are past due) and loans 90 days or more past due and still accruing interest, as of each balance sheet date. Aging Analysis of Past Due Loans and Non-performing Loans by Class (Dollar amounts in thousands) Aging Analysis (Accruing and Non-accrual) Non-performing Loans Current 30-89 Days 90 Days or Total Total Non- 90 Days or More Past Due, Still Accruing Interest As of September 30, 2021 Commercial and industrial $ 4,687,711 $ 6,475 $ 11,272 $ 17,747 $ 4,705,458 $ 14,616 $ 722 Agricultural 344,374 1,388 3,397 4,785 349,159 6,682 — Commercial real estate: Office, retail, and industrial 1,738,178 15,351 12,063 27,414 1,765,592 20,632 — Multi-family 1,077,754 2,085 3,102 5,187 1,082,941 3,450 — Construction 592,433 920 1,851 2,771 595,204 1,851 — Other commercial real estate 1,388,152 6,314 14,489 20,803 1,408,955 18,060 32 Total commercial real estate 4,796,517 24,670 31,505 56,175 4,852,692 43,993 32 Total corporate loans, 9,828,602 32,533 46,174 78,707 9,907,309 65,291 754 PPP loans 384,100 — — — 384,100 — — Total corporate loans 10,212,702 32,533 46,174 78,707 10,291,409 65,291 754 Home equity 585,157 2,043 3,926 5,969 591,126 10,006 75 1-4 family mortgages 3,319,223 3,978 9,531 13,509 3,332,732 12,786 — Installment 570,600 2,401 464 2,865 573,465 — 464 Total consumer loans 4,474,980 8,422 13,921 22,343 4,497,323 22,792 539 Total loans $ 14,687,682 $ 40,955 $ 60,095 $ 101,050 $ 14,788,732 $ 88,083 $ 1,293 As of December 31, 2020 Commercial and industrial $ 4,530,546 $ 9,254 $ 38,454 $ 47,708 $ 4,578,254 $ 42,965 $ 591 Agricultural 359,373 705 3,960 4,665 364,038 10,719 — Commercial real estate: Office, retail, and industrial 1,827,891 3,961 29,916 33,877 1,861,768 34,224 257 Multi-family 867,815 2,510 2,488 4,998 872,813 2,488 — Construction 606,934 1,154 4,523 5,677 612,611 4,980 1,065 Other commercial real estate 1,448,258 15,015 18,703 33,718 1,481,976 25,824 434 Total commercial real estate 4,750,898 22,640 55,630 78,270 4,829,168 67,516 1,756 Total corporate loans, 9,640,817 32,599 98,044 130,643 9,771,460 121,200 2,347 PPP loans 785,563 — — — 785,563 — — Total corporate loans 10,426,380 32,599 98,044 130,643 10,557,023 121,200 2,347 Home equity 750,263 5,563 5,899 11,462 761,725 10,795 956 1-4 family mortgages 3,009,564 5,296 7,553 12,849 3,022,413 10,530 115 Installment 404,831 4,263 977 5,240 410,071 — 977 Total consumer loans 4,164,658 15,122 14,429 29,551 4,194,209 21,325 2,048 Total loans $ 14,591,038 $ 47,721 $ 112,473 $ 160,194 $ 14,751,232 $ 142,525 $ 4,395 Allowance for Credit Losses The Company maintains an allowance for credit losses at a level deemed adequate by management to absorb estimated losses expected in the existing loan portfolio. See Note 1, "Summary of Significant Accounting Policies," for the accounting policy for the allowance for credit losses. A rollforward of the allowance for credit losses by portfolio segment for the quarters and nine months ended September 30, 2021 and 2020 is presented in the table below. PPP loans are excluded from this table as there is no allowance for credit losses associated with these loans because they are fully guaranteed by the U.S. Small Business Administration ("SBA"). Allowance for Credit Losses by Portfolio Segment (Dollar amounts in thousands) Commercial, Office, Multi- Construction Other Consumer Allowance for Total Quarter Ended September 30, 2021 Beginning balance $ 116,396 $ 17,992 $ 3,459 $ 4,924 $ 20,058 $ 51,772 $ 8,625 $ 223,226 Charge-offs (7,081) (673) (1) (1,153) (857) (1,992) — (11,757) Recoveries 2,116 117 — 167 28 969 — 3,397 Net charge-offs (4,965) (556) (1) (986) (829) (1,023) — (8,360) Provision for loan 508 272 172 (210) 693 (1,435) — — Ending balance $ 111,939 $ 17,708 $ 3,630 $ 3,728 $ 19,922 $ 49,314 $ 8,625 $ 214,866 Quarter Ended September 30, 2020 Beginning balance $ 123,977 $ 24,441 $ 5,311 $ 11,522 $ 21,862 $ 52,939 $ 7,625 $ 247,677 Allowance established (1,188) — — — — — — (1,188) Charge-offs (6,853) (1,344) — (4,889) (1,823) (2,629) — (17,538) Recoveries 1,118 5 — — 70 602 — 1,795 Net charge-offs (5,735) (1,339) — (4,889) (1,753) (2,027) — (15,743) Provision for loan 8,674 1,636 428 99 3,522 1,568 200 16,127 Ending balance $ 125,728 $ 24,738 $ 5,739 $ 6,732 $ 23,631 $ 52,480 $ 7,825 $ 246,873 Nine Months Ended September 30, 2021 Beginning balance $ 119,954 $ 24,078 $ 5,709 $ 6,674 $ 24,309 $ 58,293 $ 8,025 $ 247,042 Charge-offs (26,688) (9,048) (5) (1,371) (1,928) (7,661) — (46,701) Recoveries 4,887 237 7 177 269 2,250 — 7,827 Net charge-offs (21,801) (8,811) 2 (1,194) (1,659) (5,411) — (38,874) Provision for loan 13,786 2,441 (2,081) (1,752) (2,728) (3,568) 600 6,698 Ending balance $ 111,939 $ 17,708 $ 3,630 $ 3,728 $ 19,922 $ 49,314 $ 8,625 $ 214,866 Nine Months Ended September 30, 2020 Beginning balance $ 62,830 $ 7,580 $ 2,950 $ 1,697 $ 6,408 $ 26,557 $ 1,200 $ 109,222 Adjustment to apply recent accounting pronouncements (1) 20,159 11,686 397 10,300 11,427 16,235 5,553 75,757 Allowance established 11,452 2,003 — — — 39 872 14,366 Charge-offs (19,592) (4,774) (19) (7,495) (2,162) (11,660) — (45,702) Recoveries 3,097 20 5 — 226 1,574 — 4,922 Net charge-offs (16,495) (4,754) (14) (7,495) (1,936) (10,086) — (40,780) Provision for loan 47,782 8,223 2,406 2,230 7,732 19,735 200 88,308 Ending balance $ 125,728 $ 24,738 $ 5,739 $ 6,732 $ 23,631 $ 52,480 $ 7,825 $ 246,873 (1) As a result of accounting guidance adopted in the first quarter of 2020, the increase in allowance for credit losses, net of tax, was recognized as a cumulative-effect adjustment to retained earnings as of January 1, 2020. Determination of the allowance for credit losses considers multiple macroeconomic scenarios of stressed GDP, unemployment, and housing price index, detailed portfolio reviews of elevated risk sectors, and the effects of governmental responses to the pandemic. The allowance for credit losses increased from December 31, 2019 primarily due to the adoption of current expected credit losses ("CECL") and the estimated impact of the pandemic on the allowance for credit losses. The table below provides a breakdown of loans and the related allowance for credit losses by portfolio segment as of September 30, 2021 and December 31, 2020. Loans and Related Allowance for Credit Losses by Portfolio Segment (Dollar amounts in thousands) Loans Allowance for Credit Losses Individually Collectively PCD Total Individually Collectively PCD Total As of September 30, 2021 Commercial, industrial, $ 14,580 $ 4,993,501 $ 46,536 $ 5,054,617 $ 1,499 $ 105,470 $ 4,970 $ 111,939 Commercial real estate: Office, retail, and industrial 12,498 1,719,005 34,089 1,765,592 384 13,902 3,422 17,708 Multi-family 2,171 1,074,323 6,447 1,082,941 — 3,555 75 3,630 Construction 1,154 582,683 11,367 595,204 — 3,406 322 3,728 Other commercial real estate 11,993 1,353,603 43,359 1,408,955 164 10,083 9,675 19,922 Total commercial real estate 27,816 4,729,614 95,262 4,852,692 548 30,946 13,494 44,988 Total corporate loans, 42,396 9,723,115 141,798 9,907,309 2,047 136,416 18,464 156,927 PPP loans — 384,100 — 384,100 — — — — Total corporate loans 42,396 10,107,215 141,798 10,291,409 2,047 136,416 18,464 156,927 Consumer — 4,477,967 19,356 4,497,323 — 48,815 499 49,314 Allowance for unfunded — — — — — 8,625 — 8,625 Total loans $ 42,396 $ 14,585,182 $ 161,154 $ 14,788,732 $ 2,047 $ 193,856 $ 18,963 $ 214,866 As of December 31, 2020 Commercial, industrial, and $ 45,650 $ 4,826,017 $ 70,625 $ 4,942,292 $ 3,536 $ 107,763 $ 8,655 $ 119,954 Commercial real estate: Office, retail, and industrial 26,384 1,792,618 42,766 1,861,768 1,123 15,106 7,849 24,078 Multi-family 1,279 864,677 6,857 872,813 — 5,438 271 5,709 Construction 1,154 595,550 15,907 612,611 — 4,535 2,139 6,674 Other commercial real estate 13,736 1,414,541 53,699 1,481,976 171 12,651 11,487 24,309 Total commercial real estate 42,553 4,667,386 119,229 4,829,168 1,294 37,730 21,746 60,770 Total corporate loans, 88,203 9,493,403 189,854 9,771,460 4,830 145,493 30,401 180,724 PPP loans — 785,563 — 785,563 — — — — Total corporate loans 88,203 10,278,966 189,854 10,557,023 4,830 145,493 30,401 180,724 Consumer — 4,172,042 22,167 4,194,209 — 57,567 726 58,293 Allowance for unfunded — — — — — 8,025 — 8,025 Total loans $ 88,203 $ 14,451,008 $ 212,021 $ 14,751,232 $ 4,830 $ 211,085 $ 31,127 $ 247,042 The following table presents collateral-dependent loans, including PCD loans, without regard to accrual status by primary collateral type and non-accrual loans with no related allowance as of September 30, 2021 and December 31, 2020. PPP loans are excluded from this table as there is no allowance for credit losses associated with these loans because they are fully guaranteed by the SBA. Collateral-dependent Loans and Non-accrual Loans With No Related Allowance by Class (Dollar amounts in thousands) Type of Collateral Non-accrual Loans Real Blanket Equipment As of September 30, 2021 Commercial and industrial $ 4,296 $ 11,572 $ 923 $ 10,619 Agricultural 6,445 — — 2,784 Commercial real estate: Office, retail, and industrial 20,285 — — 11,868 Multi-family 2,950 — — 2,950 Construction 2,223 — — 327 Other commercial real estate 30,952 — — 6,475 Total commercial real estate 56,410 — — 21,620 Total corporate loans 67,151 11,572 923 35,023 Home equity 96 — — 96 1-4 family mortgages 1,130 — — — Installment — — — — Total consumer loans 1,226 — — 96 Total loans $ 68,377 $ 11,572 $ 923 $ 35,119 As of December 31, 2020 Commercial and industrial $ 27,007 $ 35,632 $ 2,555 $ 36,686 Agricultural 8,583 1,737 — 5,213 Commercial real estate: Office, retail, and industrial 42,790 — — 23,508 Multi-family 2,097 — — 1,279 Construction 5,370 — — 1,831 Other commercial real estate 40,430 — — 20,158 Total commercial real estate 90,687 — — 46,776 Total corporate loans 126,277 37,369 2,555 88,675 Home equity 211 — — 99 1-4 family mortgages 2,807 — — 578 Installment — — — — Total consumer loans 3,018 — — 677 Total loans $ 129,295 $ 37,369 $ 2,555 $ 89,352 Loans Individually Evaluated The following table presents loans individually evaluated by class of loan as of September 30, 2021 and December 31, 2020. PCD loans are excluded from this disclosure. Loans Individually Evaluated by Class (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 Recorded Investment In Recorded Investment In Loans with Loans with Unpaid Specific Loans with Loans with Unpaid Specific Commercial and industrial $ 7,284 $ 850 $ 22,314 $ 294 $ 33,643 $ 1,687 $ 40,055 $ 398 Agricultural 2,784 3,662 10,917 1,205 5,213 5,107 14,972 3,138 Commercial real estate: Office, retail, and industrial 10,643 1,855 14,849 384 21,537 4,847 30,474 1,123 Multi-family 2,171 — 2,171 — 1,279 — 1,279 — Construction — 1,154 1,182 — 1,154 — 1,507 — Other commercial real estate 2,593 9,400 12,863 164 12,822 914 14,240 171 Total commercial real estate 15,407 12,409 31,065 548 36,792 5,761 47,500 1,294 Total corporate loans 25,475 16,921 64,296 2,047 75,648 12,555 102,527 4,830 Consumer — — — — — — — — Total non-accrual loans $ 25,475 $ 16,921 $ 64,296 $ 2,047 $ 75,648 $ 12,555 $ 102,527 $ 4,830 Interest income recognized on non-accrual loans using the cash basis of accounting for the quarter and nine months ended September 30, 2021, was $291,000 and $864,000, respectively, and $1.0 million and $1.4 million for the same periods in 2020. Credit Quality Indicators Corporate loans and commitments are assessed for credit risk and assigned ratings based on various characteristics, such as the borrower's cash flow, leverage, and collateral. Ratings for commercial credits are reviewed at least annually or more often if events or circumstances arise that could impact the rating. The following tables present credit quality indicators for corporate and consumer loans on an amortized cost basis as of September 30, 2021 and net loan charge-offs for the nine months ended September 30, 2021. PPP loans are excluded from this table as there is no allowance for credit losses associated with these loans because they are fully guaranteed by the SBA. For a summary of credit quality indicators as of December 31, 2020, see Note 7, "Past Due Loans, Allowance for Credit Losses, Impaired Loans, and TDRs," in the Company's 2020 10-K. Corporate Loan Portfolio by Origination Year (Dollar amounts in thousands) 2021 (1) 2020 2019 2018 2017 Prior Revolving Loans Total Commercial, industrial, agricultural: Pass $ 752,464 $ 641,813 $ 723,079 $ 588,007 $ 308,785 $ 430,650 $ 1,280,272 $ 4,725,070 Special Mention (2) 2,370 894 26,523 37,174 20,750 32,822 36,094 156,627 Substandard (3) 252 2,039 21,011 64,985 22,195 19,296 21,844 151,622 Non-accrual (4) — 1,046 1,587 2,432 2,141 13,128 964 21,298 Total commercial, $ 755,086 $ 645,792 $ 772,200 $ 692,598 $ 353,871 $ 495,896 $ 1,339,174 $ 5,054,617 Commercial, industrial, $ — $ 835 $ 4,738 $ 4,745 $ 9,770 $ (873) $ 2,586 $ 21,801 Office, retail, and industrial: Pass $ 139,452 $ 138,270 $ 205,148 $ 157,894 $ 238,194 $ 727,319 $ 14,479 $ 1,620,756 Special Mention (2) 1,717 312 4,577 3,301 17,234 35,009 — 62,150 Substandard (3) 732 628 — 15,922 5,330 39,442 — 62,054 Non-accrual (4) — — — — 324 20,308 — 20,632 Total office, retail, $ 141,901 $ 139,210 $ 209,725 $ 177,117 $ 261,082 $ 822,078 $ 14,479 $ 1,765,592 Office, retail, and $ — $ — $ 246 $ 3,899 $ 1,023 $ 3,643 $ — $ 8,811 Multi-family: Pass $ 220,347 $ 154,304 $ 153,338 $ 80,207 $ 117,350 $ 277,778 $ 18,237 $ 1,021,561 Special Mention (2) — — 5,775 4,385 — 31,356 — 41,516 Substandard (3) — — — 378 70 15,966 — 16,414 Non-accrual (4) — — — — 935 2,515 — 3,450 Total multi-family $ 220,347 $ 154,304 $ 159,113 $ 84,970 $ 118,355 $ 327,615 $ 18,237 $ 1,082,941 Multi-family net loan $ — $ — $ — $ — $ 5 $ (7) $ — $ (2) Construction: Pass $ 62,941 $ 135,694 $ 89,579 $ 133,832 $ 62,946 $ 73,511 $ 24,970 $ 583,473 Special Mention (2) — — — 38 — 162 — 200 Substandard (3) — — — — 1,392 8,288 — 9,680 Non-accrual (4) — — — — 1,154 697 — 1,851 Total construction $ 62,941 $ 135,694 $ 89,579 $ 133,870 $ 65,492 $ 82,658 $ 24,970 $ 595,204 Construction net loan $ — $ — $ — $ — $ 1,104 $ 49 $ 41 $ 1,194 Other commercial real estate: Pass $ 180,456 $ 167,456 $ 157,047 $ 206,984 $ 138,750 $ 335,895 $ 23,160 $ 1,209,748 Special Mention (2) — — 24,396 12,462 10,464 22,403 — 69,725 Substandard (3) — — 1,912 30,358 20,727 58,183 242 111,422 Non-accrual (4) — — — 205 1,056 16,658 141 18,060 Total other $ 180,456 $ 167,456 $ 183,355 $ 250,009 $ 170,997 $ 433,139 $ 23,543 $ 1,408,955 Other commercial real $ — $ — $ — $ 245 $ 11 $ 1,403 $ — $ 1,659 (1) Represents year-to-date loans originated during 2021. (2) Loans categorized as special mention exhibit potential weaknesses that require the close attention of management since these potential weaknesses may result in the deterioration of repayment prospects in the future. (3) Loans categorized as substandard exhibit well-defined weaknesses that may jeopardize the liquidation of the debt. These loans continue to accrue interest because they are well-secured, and collection of principal and interest is expected within a reasonable time. (4) Loans categorized as non-accrual exhibit well-defined weaknesses that may jeopardize the liquidation of the debt or result in a loss if the deficiencies are not corrected. Consumer Loan Portfolio by Origination Year (Dollar amounts in thousands) 2021 (1) 2020 2019 2018 2017 Prior Revolving Loans Total Home equity: Performing $ 7,471 $ 10,778 $ 8,168 $ 9,650 $ 8,508 $ 48,409 $ 488,136 $ 581,120 Non-accrual — — 62 453 223 7,049 2,219 10,006 Total home equity $ 7,471 $ 10,778 $ 8,230 $ 10,103 $ 8,731 $ 55,458 $ 490,355 $ 591,126 Home equity net $ — $ — $ — $ 27 $ (42) $ (347) $ (26) $ (388) 1-4 family mortgages: Performing $ 908,935 $ 1,579,102 $ 379,230 $ 118,836 $ 74,276 $ 258,947 $ 620 $ 3,319,946 Non-accrual — 982 380 627 636 10,161 — 12,786 Total 1-4 family $ 908,935 $ 1,580,084 $ 379,610 $ 119,463 $ 74,912 $ 269,108 $ 620 $ 3,332,732 1-4 family mortgages $ — $ — $ — $ 2 $ — $ 247 $ — $ 249 Installment: Performing $ 165,389 $ 132,025 $ 108,820 $ 74,939 $ 31,654 $ 18,255 $ 42,383 $ 573,465 Non-accrual — — — — — — — — Total installment $ 165,389 $ 132,025 $ 108,820 $ 74,939 $ 31,654 $ 18,255 $ 42,383 $ 573,465 Installment net loan $ 247 $ 1,323 $ 2,590 $ 1,439 $ 97 $ (182) $ 36 $ 5,550 (1) Represents year-to-date loans originated during 2021. During the quarter and nine months ended September 30, 2021, $12.9 million and $34.0 million, respectively, and $5.2 million and $29.0 million, for the same periods in 2020, of revolving loans converted to term loans. TDRs TDRs are generally performed at the request of the individual borrower and may include forgiveness of principal, reduction in interest rates, changes in payments, and maturity date extensions. The table below presents TDRs by class as of September 30, 2021 and December 31, 2020. See Note 1, "Summary of Significant Accounting Policies," for the accounting policy for TDRs. TDRs by Class (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 Accruing Non-accrual (1) Total Accruing Non-accrual (1) Total Commercial and industrial $ — $ 6,255 $ 6,255 $ — $ 8,859 $ 8,859 Agricultural — — — — — — Commercial real estate: Office, retail, and industrial — — — — 2,340 2,340 Multi-family — 151 151 — 160 160 Construction — — — — — — Other commercial real estate 155 — 155 184 — 184 Total commercial real estate 155 151 306 184 2,500 2,684 Total corporate loans 155 6,406 6,561 184 11,359 11,543 Home equity 29 103 132 31 116 147 1-4 family mortgages 355 217 572 598 228 826 Installment — — — — — — Total consumer loans 384 320 704 629 344 973 Total loans $ 539 $ 6,726 $ 7,265 $ 813 $ 11,703 $ 12,516 (1) These TDRs are included in non-accrual loans in the preceding tables. In March of 2020, the Coronavirus Aid, Relief, and Economic Security Act (the "CARES Act") was enacted by the U.S. government in response to the economic disruption caused by the pandemic. The Company's banking regulators issued the "Interagency Statement on Loan Modifications by Financial Institutions Working with Customers Affected by the Coronavirus" that encourages financial institutions to work prudently with borrowers who are or may be unable to meet their contractual payment obligations due to the effects of the pandemic. Additionally, the CARES Act as amended by the 2021 Consolidated Appropriations Act, which was signed into law in December 2020, provides that a qualified loan modification is exempt from classification as a TDR as defined by GAAP, from the period beginning March 1, 2020 until the earlier of January 1, 2022 or the date that is 60 days after the date on which the national emergency concerning the pandemic declared by the President of the United States terminates. As of September 30, 2021, the Company has eligible modifications with outstanding balances totaling $40.6 million, which are not classified as TDRs. TDRs are included in the calculation of the allowance for credit losses in the same manner as non-accrual loans. As of September 30, 2021 and December 31, 2020 there were $245,000 and $140,000 of specific allowances, respectively, related to TDRs. There were no material restructurings during the quarters and nine months ended September 30, 2021 and 2020. Accruing TDRs that do not perform in accordance with their modified terms are transferred to non-accrual. There were no material TDRs that defaulted within twelve months of the restructure date during the quarters and nine months ended September 30, 2021 and 2020. A rollforward of the carrying value of TDRs for the quarters and nine months ended September 30, 2021 and 2020 is presented in the following table. TDR Rollforward (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2021 2020 2021 2020 Accruing Beginning balance $ 782 $ 1,201 $ 813 $ 1,233 Additions — — — — Net payments (243) (13) (274) (45) Net transfers to non-accrual — (347) — (347) Ending balance 539 841 539 841 Non-accrual Beginning balance 7,403 12,093 11,703 20,514 Additions — 11,636 — 11,636 Net payments (677) (5,886) (3,951) (8,205) Charge-offs — (2,353) (1,026) (8,455) Net transfers from accruing — 347 — 347 Ending balance 6,726 15,837 6,726 15,837 Total TDRs $ 7,265 $ 16,678 $ 7,265 $ 16,678 There were no commitments to lend additional funds to borrowers with TDRs as of September 30, 2021 and December 31, 2020.

Lease Obligations

Lease Obligations	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Lease Obligations	LEASE OBLIGATIONS The significant accounting policies related to lease obligations are presented in Note 1, "Summary of Significant Accounting Policies" to the Consolidated Financial Statements in the Company's 2020 10-K. The Company has the right to utilize certain premises under non-cancelable operating leases with varying maturity dates through the year ending December 31, 2059. As of September 30, 2021, the weighted-average remaining lease term on these leases was 9.2 years. Various leases contain renewal or termination options controlled by the Company or options to purchase the leased property during or at the expiration of the lease period at specific prices. Some leases contain escalation clauses calling for rentals to be adjusted for increased real estate taxes and other operating expenses or proportionately adjusted for increases in consumer or other price indices. Variable payments for real estate taxes and other operating expenses are considered to be non-lease components and are excluded from the determination of the lease liability. In addition, the Company leases or subleases certain real estate to third-parties. The following summary reflects the future minimum payments by year required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year and a reconciliation of those payments to the Company's lease liability as of September 30, 2021. Lease Liability (Dollar amounts in thousands) As of Year Ending December 31, 2021 $ 5,670 2022 22,517 2023 22,624 2024 22,502 2025 21,317 2026 and thereafter 96,149 Total minimum lease payments 190,779 Discount (1) (23,349) Lease liability (2) $ 167,430 (1) Represents the net present value adjustment related to minimum lease payments. (2) Included in accrued interest payable and other liabilities The discount rate for the Company's operating leases is the rate implicit in the lease and, if that rate cannot be readily determined, the Company's incremental borrowing rate. The weighted-average discount rate on the Company's operating leases was 2.71% as of September 30, 2021. As of September 30, 2021, right-of-use assets of $140.2 million associated with lease liabilities were included in accrued interest receivable and other assets During 2020, the Company initiated certain actions that include optimizing its retail branch network and delivery model through the consolidation of 17 branches, or approximately 15% of its branch network, which were completed in the first quarter of 2021. These actions resulted in pre-tax costs of $19.9 million, including $9.1 million of right-of-use asset impairment charges and $8.9 million of impairment charges on branch locations, furniture, and equipment associated with valuation adjustments related to locations identified for closure, among other items, and were recorded within optimization costs within noninterest expense during the third and fourth quarters of 2020. The following table presents net operating lease expense for the quarters and nine months ended September 30, 2021 and 2020. Net Operating Lease Expense (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2021 2020 2021 2020 Lease expense charged to operations $ 4,558 $ 4,739 $ 13,610 $ 14,253 Rental income from premises leased to others (1) (71) (158) (293) (556) Net operating lease expense $ 4,487 $ 4,581 $ 13,317 $ 13,697 (1) Included as reductions to net occupancy and equipment expense in the Condensed Consolidated Statements of Income.

Borrowed Funds

Borrowed Funds	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Borrowed Funds	BORROWED FUNDS The following table summarizes the Company's borrowed funds by funding source. Summary of Borrowed Funds (Dollar amounts in thousands) As of September 30, December 31, Securities sold under agreements to repurchase $ 124,044 $ 141,886 FHLB advances 1,150,528 1,404,528 Total borrowed funds $ 1,274,572 $ 1,546,414 Securities sold under agreements to repurchase generally mature within 1 to 90 days from the transaction date, are treated as financings, and are included as a liability in the Consolidated Statements of Financial Condition. Repurchase agreements are secured by U.S. treasury and agency securities which are held in third-party pledge accounts, if required. The securities underlying the agreements remain in the respective asset accounts. As of September 30, 2021, the Company did not have amounts at risk under repurchase agreements with any individual counterparty or group of counterparties that exceeded 10% of stockholders' equity. The Bank is a member of the FHLB and has access to term financing from the FHLB. These advances are secured by designated assets that may include qualifying commercial real estate, residential and multi-family mortgages, home equity loans, and certain municipal and mortgage-backed securities. As of September 30, 2021, FHLB advances, including certain putable advances, had fixed interest rates that range from 0.00% to 1.97% and maturity dates that range from June 12, 2024 to March 4, 2030. The Company hedges interest rates on borrowed funds using interest rate swaps through which the Company receives variable amounts and pays fixed amounts. See Note 12 "Derivative Instruments and Hedging Activities" for a detailed discussion of interest rate swaps. The following table presents short-term credit lines available for use, for which the Company did not have an outstanding balance as of September 30, 2021 and December 31, 2020. Short-Term Credit Lines Available for Use (Dollar amounts in thousands) As of September 30, December 31, FRB's Discount Window Primary Credit Program $ 857,758 $ 864,867 Available federal funds lines 982,000 844,000 Correspondent bank line of credit — 50,000 On September 27, 2016, the Company entered into a loan agreement with U.S. Bank National Association providing for a $50.0 million short-term, unsecured revolving credit facility. On September 26, 2020, the Company entered into a fourth amendment to this credit facility, which extended the maturity to September 26, 2021, at which time the facility was not renewed. A discussion of terms relevant to senior and subordinated debt is presented in Note 13, "Senior and Subordinated Debt" to the Consolidated Financial Statements in the Company's 2020 10-K.

Material Transactions Affecting

Material Transactions Affecting Stockholders' Equity	9 Months Ended
	Sep. 30, 2021
Equity [Abstract]
Material Transactions Affecting Stockholders' Equity	MATERIAL TRANSACTIONS AFFECTING STOCKHOLDERS' EQUITY Issuance of Common Stock On March 9, 2020, the Company issued 4.9 million shares of its common stock with a market value of $14.58 per share at issuance as part of the consideration in the Park Bank acquisition. Additional information regarding the Park Bank acquisition is presented in Note 3, "Acquisitions." Issuance of Preferred Stock During the second quarter of 2020, the Company issued 4.3 million depositary shares, each representing a 1/40th interest in a share of the Company's 7.000% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A, and 4.9 million depositary shares, each representing a 1/40th interest in a share of the Company's 7.000% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series C, for an aggregate of $230.5 million. The Company received proceeds of $221.2 million, net of underwriting discounts and commissions and issuance costs and expects to use the proceeds for general corporate purposes. Stock Repurchases On February 26, 2020, the Company announced a stock repurchase program authorizing the discretionary repurchase of up to $200 million of its outstanding common stock through December 31, 2021. This program replaced the Company's prior $180 million stock repurchase program, which expired in March 2020. The Company repurchased 715,000 shares of its common stock at a total cost of $14.9 million during the nine months ended September 30, 2021. The Company did not repurchase any shares of its common stock during the third quarter of 2021.

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Common Share	EARNINGS PER COMMON SHARE The table below displays the calculation of basic and diluted earnings per common share ("EPS"). Basic and Diluted EPS (Amounts in thousands, except per share data) Quarters Ended Nine Months Ended 2021 2020 2021 2020 Net income $ 54,863 $ 27,623 $ 151,007 $ 66,293 Preferred dividends (4,033) (4,033) (12,101) (5,070) Net income applicable to unvested restricted shares (517) (236) (1,524) (615) Net income applicable to common shares $ 50,313 $ 23,354 $ 137,382 $ 60,608 Weighted-average common shares outstanding: Weighted-average common shares outstanding (basic) 112,898 113,160 112,953 112,079 Dilutive effect of common stock equivalents 878 276 789 322 Weighted-average diluted common shares outstanding 113,776 113,436 113,742 112,401 Basic EPS $ 0.45 $ 0.21 $ 1.22 $ 0.54 Diluted EPS $ 0.44 $ 0.21 $ 1.21 $ 0.54

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES In the ordinary course of business, the Company enters into derivative transactions as part of its overall interest rate risk management strategy. The significant accounting policies related to derivative instruments and hedging activities are presented in Note 1, "Summary of Significant Accounting Policies." Cash Flow Hedges As of September 30, 2021, the Company hedged $430.0 million of certain corporate variable rate loans using interest rate swaps through which the Company receives fixed amounts and pays variable amounts. The Company also hedged $25.0 million of borrowed funds using interest rate swaps through which the Company receives variable amounts and pays fixed amounts. These transactions allow the Company to add stability to net interest income and manage its exposure to interest rate movements. The forward starting interest rate swaps totaling $25.0 million begin in January of 2023 and mature in January of 2026. The weighted-average fixed interest rate to be paid on these interest rate swaps that have not yet begun was 0.60% as of September 30, 2021. These derivative contracts are designated as cash flow hedges. Cash Flow Hedges (Dollar amounts in thousands) As of September 30, 2021 December 31, 2020 Gross notional amount outstanding $ 455,000 $ 455,000 Derivative asset fair value in other assets (1) 460 3,707 Derivative liability fair value in other liabilities (1) — (1) Weighted-average interest rate received 2.18 % 2.18 % Weighted-average interest rate paid 0.08 % 0.15 % Weighted-average maturity (in years) 0.75 1.50 (1) Certain cash flow hedges are transacted through a clearinghouse ("centrally cleared") and their change in fair value is settled by the counterparties to the transaction, which results in no fair value. Changes in the fair value of cash flow hedges are recorded in accumulated other comprehensive income (loss) on an after-tax basis and are subsequently reclassified to interest income or expense in the period that the forecasted hedged item impacts earnings. As of September 30, 2021, the Company estimates that $5.8 million will be reclassified from accumulated other comprehensive income (loss) as an increase to interest income over the next twelve months. Other Derivative Instruments The Company also enters into derivative transactions through capital market products with its commercial customers and simultaneously enters into an offsetting interest rate derivative transaction with third-parties. This transaction allows the Company's customers to effectively convert a variable rate loan into a fixed rate loan. Due to the offsetting nature of these transactions, the Company does not apply hedge accounting treatment. The Company's credit exposure on these derivative transactions results primarily from counterparty credit risk. The credit valuation adjustment ("CVA") is a fair value adjustment to the derivative to account for this risk. As of September 30, 2021 and December 31, 2020, the Company's credit exposure was fully secured by the underlying collateral on customer loans and mitigated through netting arrangements with third-parties; therefore, no CVA was recorded. Capital market products income related to commercial customer derivative instruments totaled $1.3 million and $5.4 million for the quarter and nine months ended September 30, 2021, and were $886,000 and $6.3 million for the quarter and nine months ended September 30, 2020. Other Derivative Instruments (Dollar amounts in thousands) As of September 30, 2021 December 31, 2020 Gross notional amount outstanding $ 4,564,808 $ 4,491,398 Derivative asset fair value in other assets (1) 90,710 149,997 Derivative liability fair value in other liabilities (1) (30,729) (44,580) Fair value of derivative (2) 32,262 46,018 (1) Certain other derivative instruments are centrally cleared and their change in fair value is settled by the counterparties to the transaction, which results in no fair value. (2) This amount represents the fair value if credit risk related contingent features were triggered. The Company occasionally enters into risk participation agreements with counterparty banks to transfer or assume a portion of the credit risk related to customer transactions. The amounts of these instruments were not material for any periods presented. The Company had no other derivative instruments as of September 30, 2021 and December 31, 2020. The Company does not enter into derivative transactions for purely speculative purposes. The following table presents the impact of derivative instruments on comprehensive income (loss) and the reclassification of gains (losses) from accumulated other comprehensive income (loss) to net interest income for the quarters and nine months ended September 30, 2021 and 2020. Cash Flow Hedge Accounting on AOCI (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2021 2020 2021 2020 (Losses) gains recognized in other comprehensive income Interest rate swaps in interest income $ (119) $ 96 $ 235 $ 28,051 Interest rate swaps in interest expense (28) (239) (730) (13,924) Reclassification of gains (losses) included in net income Interest rate swaps in interest income $ 2,238 $ 2,165 $ 6,668 $ 5,234 Interest rate swaps in interest expense — (16,350) — (16,350) The following table presents the impact of derivative instruments on net interest income for the quarters and nine months ended September 30, 2021 and 2020. Hedge Income (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2021 2020 2021 2020 Cash Flow Hedges Interest rate swaps in interest income $ 2,238 $ 2,165 $ 6,668 $ 5,234 Interest rate swaps in interest expense — (16,350) — (16,350) Total cash flow hedges $ 2,238 $ (14,185) $ 6,668 $ (11,116) Credit Risk Derivative instruments are inherently subject to credit risk, which represents the Company's risk of loss when the counterparty to a derivative contract fails to perform according to the terms of the agreement. Credit risk is managed by limiting and collateralizing the aggregate amount of net unrealized losses by transaction, monitoring the size and the maturity structure of the derivatives, and applying uniform credit standards. Company policy establishes limits on credit exposure to any single counterparty. In addition, the Company established bilateral collateral agreements with derivative counterparties that provide for exchanges of marketable securities or cash to collateralize either party's net losses above a stated minimum threshold. As of September 30, 2021 and December 31, 2020, these collateral agreements covered 100% of the fair value of the Company's outstanding derivatives. Derivative assets and liabilities are presented gross, rather than net, of pledged collateral amounts. Certain derivative instruments are subject to master netting agreements with counterparties. The Company records these transactions at their gross fair values and does not offset derivative assets and liabilities in the Consolidated Statements of Financial Condition. The following table presents the fair value of the Company's derivatives and offsetting positions as of September 30, 2021 and December 31, 2020. Fair Value of Offsetting Derivatives (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 Assets Liabilities Assets Liabilities Gross amounts recognized $ 91,170 $ 30,729 $ 153,704 $ 44,581 Less: amounts offset in the Consolidated Statements of — — — — Net amount presented in the Consolidated Statements of Financial Condition (1) 91,170 30,729 153,704 44,581 Gross amounts not offset in the Consolidated Statements of Offsetting derivative positions (2,285) (2,285) (5,239) (5,239) Cash collateral pledged — (26,470) — (39,970) Net credit exposure $ 88,885 $ 1,974 $ 148,465 $ (628) (1) Included in other assets or other liabilities in the Consolidated Statements of Financial Condition. As of September 30, 2021 and December 31, 2020, the Company's derivative instruments generally contained provisions that require the Company's debt to remain above a certain credit rating by each of the major credit rating agencies or that the Company maintain certain capital levels. If the Company's debt were to fall below that credit rating or the Company's capital were to fall below the required levels, it would be in violation of those provisions, and the counterparties to the derivative instruments could terminate the swap transaction and demand cash settlement of the derivative instrument in an amount equal to the derivative liability fair value. As of September 30, 2021 and December 31, 2020 the Company was in compliance with these provisions.

Commitments, Guarantees, and Co

Commitments, Guarantees, and Contingent Liabilities	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments, Guarantees, and Contingent Liabilities	COMMITMENTS, GUARANTEES, AND CONTINGENT LIABILITIES Credit Commitments and Guarantees In the normal course of business, the Company enters into a variety of financial instruments with off-balance sheet risk to meet the financing needs of its customers and to conduct lending activities, including commitments to extend credit as well as standby and commercial letters of credit. These instruments involve elements of credit and interest rate risk in excess of the amount recognized in the Consolidated Statements of Financial Condition. Contractual or Notional Amounts of Financial Instruments (Dollar amounts in thousands) As of September 30, 2021 December 31, 2020 Commitments to extend credit: Commercial, industrial, and agricultural $ 2,313,362 $ 2,318,346 Commercial real estate 515,624 378,282 Home equity 608,440 611,640 Other commitments (1) 273,734 264,869 Total commitments to extend credit $ 3,711,160 $ 3,573,137 Letters of credit $ 114,797 $ 115,130 (1) Other commitments includes installment and overdraft protection program commitments. Commitments to extend credit are agreements to lend funds to a customer, subject to contractual terms and covenants. Commitments generally have fixed expiration dates or other termination clauses, variable interest rates, and fee requirements, when applicable. Since many of the commitments are expected to expire without being drawn, the total commitment amounts do not necessarily represent future cash flow requirements. In the event of a customer's non-performance, the Company's credit loss exposure is equal to the contractual amount of the commitments. The credit risk is essentially the same as extending loans to customers for the full contractual amount. The Company uses the same credit policies for credit commitments as its loans and minimizes exposure to credit loss through various collateral requirements. Letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third-party. Letters of credit generally are contingent on the failure of the customer to perform according to the terms of the contract with the third-party and are often issued in favor of a municipality where construction is taking place to ensure the customer adequately completes the construction. Commercial letters of credit are issued to facilitate transactions between a customer and a third-party based on agreed upon terms. The maximum potential future payments guaranteed by the Company under letters of credit arrangements are equal to the contractual amount of the commitment. If a commitment is funded, the Company may seek recourse through the liquidation of the underlying collateral, including real estate, production plants and property, marketable securities, or receipt of cash. As a result of the sale of certain 1-4 family mortgage loans, the Company is contractually obligated to repurchase early payment default loans or loans that do not meet underwriting requirements at recorded value. In accordance with the sales agreements, there is no limitation to the maximum potential future payments or expiration of the Company's recourse obligation. There were no material loan repurchases during the quarters and nine months ended September 30, 2021 and 2020. Legal Proceedings

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value	FAIR VALUE Fair value represents the amount expected to be received to sell an asset or paid to transfer a liability in its principal or most advantageous market in an orderly transaction between market participants at the measurement date. In accordance with fair value accounting guidance, the Company measures, records, and reports various types of assets and liabilities at fair value on either a recurring or non-recurring basis in the Consolidated Statements of Financial Condition. Those assets and liabilities are presented below in the sections titled "Assets and Liabilities Required to be Measured at Fair Value on a Recurring Basis" and "Assets and Liabilities Required to be Measured at Fair Value on a Non-Recurring Basis." Other assets and liabilities are not required to be measured at fair value in the Consolidated Statements of Financial Condition, but must be disclosed at fair value. See the "Fair Value Measurements of Other Financial Instruments" section of this note. Any aggregation of the estimated fair values presented in this note does not represent the value of the Company. Depending on the nature of the asset or liability, the Company uses various valuation methodologies and assumptions to estimate fair value. GAAP provides a three-tiered fair value hierarchy based on the inputs used to measure fair value. The hierarchy is defined as follows: • Level 1 – Quoted prices in active markets for identical assets or liabilities. • Level 2 – Observable inputs other than level 1 prices, such as quoted prices for similar instruments, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data. • Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. These inputs require significant management judgment or estimation, some of which use model-based techniques and may be internally developed. Assets and liabilities are assigned to a level within the fair value hierarchy based on the lowest level of significant input used to measure fair value. Assets and liabilities may change levels within the fair value hierarchy due to market conditions or other circumstances. Those transfers are recognized on the date of the event that prompted the transfer. There were no transfers of assets or liabilities required to be measured at fair value on a recurring basis between levels of the fair value hierarchy during the periods presented. Assets and Liabilities Required to be Measured at Fair Value on a Recurring Basis The following table provides the fair value for assets and liabilities required to be measured at fair value on a recurring basis in the Consolidated Statements of Financial Condition by level in the fair value hierarchy. Recurring Fair Value Measurements (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Assets Equity securities $ 87,232 $ 22,616 $ — $ 52,888 $ 18,516 $ — Securities available-for-sale U.S. treasury securities — — — 12,051 — — U.S. agency securities — 656,112 — — 652,474 — CMOs — 1,295,544 — — 1,438,518 — MBSs — 856,096 — — 580,840 — Municipal securities — 224,618 — — 236,015 — Corporate debt securities — 180,538 — — 176,510 — Total securities available-for-sale — 3,212,908 — 12,051 3,084,357 — Mortgage servicing rights ("MSRs") (1) — — 6,306 — — 4,899 Derivative assets (1) — 91,170 — — 153,704 — Liabilities Derivative liabilities (2) $ — $ 30,729 $ — $ — $ 44,581 $ — (1) Included in other assets in the Consolidated Statements of Financial Condition. (2) Included in other liabilities in the Consolidated Statements of Financial Condition. The following sections describe the specific valuation techniques and inputs used to measure financial assets and liabilities at fair value. Equity Securities The Company's equity securities consist primarily of community development investments and certain diversified securities held in a grantor trust for participants in the Company's nonqualified deferred compensation plan that are invested in money market and mutual funds, and various preferred equity investments. The fair value of certain community development investments is based on quoted prices in active markets or market prices for similar securities obtained from external pricing services or dealer market participants and is classified in level 2 of the fair value hierarchy. As of September 30, 2021, the fair value of certain community development investments totaling $5.0 million was based on the net asset value per share ("NAV") practical expedient and can be redeemed at any month end with 30 days notice. Because these investments are measured at fair value using the NAV practical expedient, they are not classified in the fair value hierarchy. The fair value of the money market, mutual funds, and preferred equity investments is based on quoted market prices in active exchange markets and is classified in level 1 of the fair value hierarchy. Securities Available-for-Sale The Company's securities available-for-sale are primarily fixed income instruments that are not quoted on an exchange but may be traded in active markets. The fair values for these securities are based on quoted prices in active markets or market prices for similar securities obtained from external pricing services or dealer market participants and are classified in level 2 of the fair value hierarchy. The fair value of U.S. treasury securities is based on quoted market prices in active exchange markets and is classified in level 1 of the fair value hierarchy. Quarterly, the Company evaluates the methodologies used by its external pricing services to estimate the fair value of these securities in order to determine whether the valuations represent an exit price in the Company's principal markets. MSRs The Company services loans for others totaling $808.6 million and $766.1 million as of September 30, 2021 and December 31, 2020, respectively. These loans are owned by third-parties and are not included in the Consolidated Statements of Financial Condition. The Company determines the fair value of MSRs by estimating the present value of expected future cash flows associated with the mortgage loans being serviced and classifies them in level 3 of the fair value hierarchy. The following table presents the ranges of significant, unobservable inputs used by the Company to determine the fair value of MSRs as of September 30, 2021 and December 31, 2020. Significant Unobservable Inputs Used in the Valuation of MSRs As of September 30, 2021 December 31, 2020 Prepayment speed 2.4 % - 15.4% 5.3 % - 16.3% Maturity (months) 14 - 82 13 - 71 Discount rate 9.5 % - 15.0% 9.5 % - 12.0% The impact of changes in these key inputs could result in a significantly higher or lower fair value measurement for MSRs. Significant increases in expected prepayment speeds and discount rates have negative impacts on the valuation. Higher maturity assumptions have a favorable effect on the estimated fair value. A rollforward of the carrying value of MSRs for the quarters and nine months ended September 30, 2021 and 2020 is presented in the following table. Carrying Value of MSRs (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2021 2020 2021 2020 Beginning balance $ 6,269 $ 4,464 $ 4,899 $ 5,858 New MSRs 267 727 1,834 1,628 Total gains (losses) included in earnings (1) : Changes in valuation inputs and assumptions 137 (432) 603 (2,090) Other changes in fair value (2) (367) (301) (1,030) (938) Ending balance (3) $ 6,306 $ 4,458 $ 6,306 $ 4,458 Contractual servicing fees earned (1) $ 512 $ 424 $ 1,472 $ 1,221 (1) Included in mortgage banking income in the Condensed Consolidated Statements of Income and related to assets held as of September 30, 2021 and 2020. (2) Primarily represents changes in expected future cash flows due to payoffs and paydowns. (3) Included in other assets in the Consolidated Statements of Financial Condition. Derivative Assets and Derivative Liabilities The Company enters into interest rate swaps and derivative transactions with commercial customers. These derivative transactions are executed in the dealer market, and pricing is based on market quotes obtained from the counterparties. The market quotes were developed using market observable inputs, which primarily include LIBOR. Therefore, derivatives are classified in level 2 of the fair value hierarchy. For its derivative assets and liabilities, the Company also considers non-performance risk, including the likelihood of default by itself and its counterparties, when evaluating whether the market quotes from the counterparty are representative of an exit price. Assets and Liabilities Required to be Measured at Fair Value on a Non-Recurring Basis The following table provides the fair value for each class of assets and liabilities required to be measured at fair value on a non-recurring basis in the Consolidated Statements of Financial Condition by level in the fair value hierarchy. Non-Recurring Fair Value Measurements (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Collateral-dependent non-accrual loans (1) $ — $ — $ 25,198 $ — $ — $ 21,246 OREO (2) — — 2,000 — — — Loans held-for-sale (3) — — 15,725 — — 44,965 Assets held-for-sale (4) — — 3,438 — — 3,722 (1) Includes non-accrual loans with charge-offs and non-accrual loans with a specific allowance during the periods presented. (2) Includes OREO with fair value adjustments subsequent to initial transfer that occurred during the periods presented. (3) Included in other assets in the Consolidated Statements of Financial Condition. (4) Included in premises, furniture, and equipment in the Consolidated Statements of Financial Condition. Collateral-Dependent Non-accrual Loans Certain collateral-dependent non-accrual loans are subject to fair value adjustments to reflect the difference between the carrying value of the loan and the fair value of the underlying collateral. The fair values of collateral-dependent non-accrual loans are primarily determined by current appraised values of the underlying collateral. Based on the age and/or type of collateral, appraisals may be adjusted in the range of 0% to 15%. In certain cases, an internal valuation may be used when the underlying collateral is located in areas where comparable sales data is limited or unavailable. Accordingly, collateral-dependent non-accrual loans are classified in level 3 of the fair value hierarchy. Collateral-dependent non-accrual loans for which the fair value is greater than the recorded investment are not measured at fair value in the Consolidated Statements of Financial Condition and are not included in this disclosure. OREO The fair value of OREO is measured using the current appraised value of the properties. In certain circumstances, a current appraisal may not be available or may not represent an accurate measurement of the property's fair value due to outdated market information or other factors. In these cases, the fair value is determined based on the lower of the (i) most recent appraised value, (ii) broker price opinion, (iii) current listing price, or (iv) signed sales contract, all less estimated costs to sell. Given these valuation methods, OREO is classified in level 3 of the fair value hierarchy. Loans Held-for-Sale As of September 30, 2021 and December 31, 2020, loans held-for-sale consists of 1-4 family mortgage loans, which were originated with the intent to sell. These loans were recorded in the held-for-sale category at the contract price and, accordingly, are classified in level 3 of the fair value hierarchy. Assets Held-for-Sale Assets held-for-sale as of September 30, 2021 and December 31, 2020 consists of former branches that are no longer in operation and parcels of land previously purchased for expansion. These properties are being actively marketed and were transferred into the held-for-sale category at their fair value as determined by current appraisals. Based on these valuation methods, they are classified in level 3 of the fair value hierarchy. Financial Instruments Not Required to be Measured at Fair Value For certain financial instruments that are not required to be measured at fair value in the Consolidated Statements of Financial Condition, the Company must disclose the estimated fair values and the level within the fair value hierarchy as shown in the following table. Fair Value Measurements of Other Financial Instruments (Dollar amounts in thousands) As of September 30, 2021 December 31, 2020 Fair Value Hierarchy Carrying Fair Value Carrying Fair Value Assets Cash and due from banks 1 $ 270,020 $ 270,020 $ 196,364 $ 196,364 Interest-bearing deposits in other banks 2 1,654,917 1,654,917 920,880 920,880 Securities held-to-maturity 2 10,853 10,461 12,071 11,686 FHLB and FRB stock 2 106,090 106,090 117,420 117,420 Loans 3 14,582,491 14,425,048 14,512,215 14,614,029 Investment in BOLI 3 300,387 300,387 301,101 301,101 Accrued interest receivable 3 62,018 62,018 68,390 68,390 Liabilities Deposits 2 $ 17,198,402 $ 17,199,593 $ 16,012,464 $ 16,007,133 Borrowed funds 2 1,274,572 1,274,572 1,546,414 1,546,414 Senior and subordinated debt 2 235,383 283,439 234,768 281,843 Accrued interest payable 2 2,915 2,915 4,826 4,826 Management uses various methodologies and assumptions to determine the estimated fair values of the financial instruments in the table above. The fair value estimates are made at a discrete point in time based on relevant market information and consider management's judgments regarding future expected economic conditions, loss experience, and specific risk characteristics of the financial instruments. Loans include net loans, which consists of loans held-for-investment, acquired loans, and the allowance for loan losses. As of both September 30, 2021 and December 31, 2020, the Company estimated the fair value of lending commitments outstanding to be immaterial.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation – The accompanying unaudited condensed consolidated interim financial statements ("consolidated financial statements") of First Midwest Bancorp, Inc. (the "Company"), a Delaware corporation, were prepared in accordance with the rules and regulations of the Securities and Exchange Commission ("SEC") for quarterly reports on Form 10-Q and reflect all adjustments that management deems necessary for the fair presentation of the financial position and results of operations for the periods presented. The results of operations for the quarter and nine months ended September 30, 2021 are not necessarily indicative of the results that may be expected for the year ending December 31, 2021.
Reclassification	Certain reclassifications were made to prior year amounts to conform to the current year presentation.
Use of Estimates	Use of Estimates – The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Although these estimates and assumptions are based on the best available information, actual results could differ from those estimates.
Principles of Consolidation	Principles of Consolidation – The accompanying consolidated financial statements include the financial position and results of operations of the Company and its subsidiaries after elimination of all significant intercompany accounts and transactions. Assets held in a fiduciary or agency capacity are not assets of the Company or its subsidiaries and are not included in the consolidated financial statements.
Business Combinations	Business Combinations – Business combinations are accounted for under the acquisition method of accounting. Assets acquired and liabilities assumed are recorded at their estimated fair values as of the date of acquisition, with any excess of the purchase price of the acquisition over the fair value of the identifiable net tangible and intangible assets acquired recorded as goodwill. Alternatively, a gain is recorded if the fair value of assets purchased exceeds the fair value of liabilities assumed and consideration paid. The results of operations of the acquired business are included in the Condensed Consolidated Statements of Income from the effective date of the acquisition.
Loans	Loans – Loans held-for-investment are loans that the Company intends to hold until they are paid in full and are carried at the principal amount outstanding, including certain net deferred loan origination fees. Loan origination fees, commitment fees, and certain direct loan origination costs are deferred, and the net amount is amortized as a yield adjustment over the contractual life of the related loans or commitments and included in interest income. Fees related to letters of credit are amortized into fee income over the contractual life of the commitment. Other credit-related fees are recognized as fee income when earned. The Company's net investment in direct financing leases is included in loans and consists of future minimum lease payments and estimated residual values, net of unearned income. Interest income on loans is accrued based on principal amounts outstanding. Loans held-for-sale are carried at the lower of aggregate cost or fair value and included in other assets in the Consolidated Statements of Financial Condition.
Acquired Loans	Acquired Loans – Acquired loans consist of all loans acquired in business combinations and are included within loans held-for-investment. Acquired loans are separated into (i) non-purchased credit deteriorated ("non-PCD") loans and (ii) purchased credit deteriorated ("PCD") loans. Non-PCD loans include loans that did not have evidence of more-than-insignificant credit deterioration since origination at the acquisition date. PCD loans include loans that had evidence of more-than-insignificant credit deterioration since origination. Evidence of credit deterioration was evaluated using various indicators, such as past due and non-accrual status. Leases and revolving loans do not qualify to be accounted for as PCD loans and are accounted for as non-PCD loans. The acquisition adjustment related to non-PCD loans is amortized into interest income over the contractual life of the related loans. If an acquired non-PCD loan is renewed subsequent to the acquisition date, any remaining acquisition adjustment is accreted into interest income and the loan is considered a new loan that is no longer classified as an acquired loan.
90-Days Past Due Loans	90-Days Past Due Loans – The Company's accrual of interest on loans is generally discontinued at the time the loan is 90 days past due unless the credit is sufficiently collateralized and in the process of renewal or collection.
Non-accrual Loans	Non-accrual Loans – Generally, corporate loans are placed on non-accrual status (i) when either principal or interest payments become 90 days or more past due unless the credit is sufficiently collateralized and in the process of renewal or collection, or (ii) when an individual analysis of a borrower's creditworthiness warrants a downgrade to non-accrual regardless of past due status. When a loan is placed on non-accrual status, unpaid interest credited to income in the current year is reversed, and unpaid interest accrued in prior years is charged against the allowance for loan losses. After the loan is placed on non-accrual status, all debt service payments are applied to the principal on the loan. Future interest income may only be recorded on a cash basis after recovery of principal is reasonably assured. Non-accrual loans are returned to accrual status when the financial position of the borrower and other relevant factors indicate that the Company will collect all principal and interest. Non-accrual loans with balances under a specified threshold are not individually evaluated for impairment. For all other non-accrual loans, impairment is measured by comparing the estimated value of the loan to the recorded book value. The value of collateral-dependent loans is based on the fair value of the underlying collateral, less costs to sell. The value of other loans is measured using the present value of expected future cash flows discounted at the loan's effective interest rate. Commercial loans and loans secured by real estate are charged-off when deemed uncollectible. A loss is recorded if the net realizable value of the underlying collateral is less than the outstanding principal and interest. Consumer loans that are not secured by real estate are subject to mandatory charge-off at a specified delinquency date and are usually not classified as non-accrual prior to being charged-off. Closed-end consumer loans, which include installment, consumer secured, and single payment loans, are usually charged-off no later than the end of the month in which the loan becomes 120 days past due.
Troubled Debt Restructurings (“TDRs”)	Troubled Debt Restructurings ( " TDR s" ) – A restructuring is considered a TDR when (i) the borrower is experiencing financial difficulties, and (ii) the creditor grants a concession, such as forgiveness of principal, reduction of the interest rate, changes in payments, or extension of the maturity date. Loans are not classified as TDRs when the modification is short-term or results in an insignificant delay in payments. The Company's TDRs are determined on a case-by-case basis. The Company does not accrue interest on a TDR unless it believes collection of all principal and interest under the modified terms is reasonably assured. For a TDR to begin accruing interest, the borrower must demonstrate some level of past performance and the future capacity to perform under the modified terms. Generally, six months of consecutive payment performance under the restructured terms is required before a TDR is returned to accrual status. However, the period could vary depending on the individual facts and circumstances of the loan. An evaluation of the borrower's current creditworthiness is used to assess the borrower's capacity to repay the loan under the modified terms. This evaluation includes an estimate of expected future cash flows, evidence of strong financial position, and estimates of the value of collateral, if applicable. For TDRs to be removed from TDR status in the calendar year after the restructuring, the loans must (i) have an interest rate and terms that reflect market conditions at the time of restructuring, and (ii) be in compliance with the modified terms. If the loan was restructured at below market rates and terms, it continues to be separately reported as restructured until it is paid in full or charged-off.
Allowance for Credit/Allowance for Loan Losses/Allowance for Unfunded Commitments	Allowance for Credit Losses – The allowance for credit losses is comprised of the allowance for loan losses and the allowance for unfunded commitments and is maintained by management at a level believed adequate to absorb current expected credit losses in the existing loan portfolio. Determination of the allowance for credit losses is subjective since it requires significant estimates and management judgment, including the amounts and timing of expected future cash flows, actual loss experience, consideration of current national, regional, and local economic trends and conditions, reasonable and supportable forecasts about the future, changes in interest rates and property values, various internal and external qualitative factors, and other factors. Loans deemed to be uncollectible are charged-off against the allowance for loan losses, while recoveries of amounts previously charged-off are credited to the allowance for loan losses. Additions to the allowance for loan losses are charged to expense through the provision for loan losses. The amount of provision depends on a number of factors, including net charge-off levels, loan growth, changes in the composition of the loan portfolio, and the Company's assessment of the allowance for loan losses based on the methodology discussed below. Allowance for Loan Losses – The allowance for loan losses consists of (i) specific allowance for individual loans where the recorded investment exceeds the value, (ii) an allowance based on historical credit loss experience with consideration of reasonable and supportable forecasts of economic conditions for each loan category, and (iii) an allowance based on other internal and external qualitative factors. The allowance for individual loans is based on a periodic analysis of non-accrual loans individually exceeding a specific dollar amount. If the estimated value of a non-accrual loan is less than its recorded book value, the Company either (i) provides an allowance in the amount of the excess of the book value over the estimated value of the related loan or, (ii) if the loss is confirmed, charges off the loss. The allowance by loan category is based on a discounted cash flows analysis as future cash flows are discounted at an effective rate of return. In addition, estimates of losses on future cash flows is forecasted by applying probability of default and loss given default factors as well as prepayment and curtailment assumptions to cash flows that are adjusted to a present value. This discounted cash flow analysis is updated quarterly, primarily using actual loss experience adjusted for current reasonable and supportable forecasts of economic conditions over a one-year forecast period. After the one-year forecast period, a one-year reversion period adjusts loss experience to the historical average on a straight-line basis. These forecasts consider multiple scenarios of key assumptions including national unemployment rates, housing price indices, and gross domestic product. This general allowance component is then adjusted based on management's consideration of many internal and external qualitative factors, including: • Changes in the composition of the loan portfolio, trends in the volume of loans, and trends in delinquent and non-accrual loans that could indicate that historical trends do not reflect current conditions. • Changes in credit policies and procedures, such as underwriting standards and collection, charge-off, and recovery practices. • Changes in the experience, ability, and depth of credit management and other relevant staff. • Changes in the quality of the Company's loan review system and Board of Directors oversight. • The effect of any concentration of credit and changes in the level of concentrations, such as loan type or risk rating. • Changes in the value of the underlying collateral for collateral-dependent loans. • Changes in the national, regional, and local economy that affect the collectability of various segments of the portfolio. • The effect of other external factors, such as competition and legal and regulatory requirements, on the Company's loan portfolio. The allowance for loan losses also includes an allowance on acquired non-PCD and PCD loans. An allowance for loan losses is recorded on acquired PCD loans at the acquisition date through purchase accounting adjustments. Subsequent to the acquisition date, the allowance for loan losses on PCD loans is estimated as are the allowances for all other loans in the portfolio. No allowance for loan losses is recorded on acquired non-PCD loans at the acquisition date through purchase accounting. Instead, an allowance is established on acquired non-PCD loans at the acquisition date in-line with all other loans in the portfolio as if the loans were originated at the acquisition date. On a periodic basis, the adequacy of this allowance is determined using either a PD/LGD methodology or a specific review methodology. Allowance for Unfunded Commitments – The Company also maintains an allowance for unfunded commitments, including letters of credit, for the risk of loss inherent in these arrangements. The allowance for unfunded commitments is estimated using the historical credit loss experience with consideration of reasonable and supportable forecasts of economic conditions for each loan category. The allowance for unfunded commitments is included in other liabilities in the Consolidated Statements of Financial Condition. The establishment of the allowance for credit losses involves a high degree of judgment and estimation given the difficulty of assessing the factors impacting loan repayment and estimating the timing and amount of losses. While management utilizes its best judgment and information available, the adequacy of the allowance for credit losses depends on a variety of factors beyond the Company's control, including the performance of its loan portfolio, current national, regional, and local economic trends, reasonable and supportable forecasts about the future, changes in interest rates and property values, the amounts and timing of expected future cash flows on non-accrual loans, estimated losses on pools of homogenous loans, the interpretation of loan risk classifications by regulatory authorities, various internal and external qualitative factors, and other factors.
Derivative Financial Instruments	Derivative Financial Instruments – To provide derivative products to customers and in the ordinary course of business, the Company enters into derivative transactions as part of its overall interest rate risk management strategy to minimize significant unplanned fluctuations in earnings and expected future cash flows caused by interest rate volatility. All derivative instruments are recorded at fair value as either other assets or other liabilities in the Consolidated Statements of Financial Condition. Subsequent changes in a derivative's fair value are recognized in earnings unless specific hedge accounting criteria are met. On the date the Company enters into a derivative contract, the derivative is designated as a fair value hedge, a cash flow hedge, or a non-hedge derivative instrument. Fair value hedges are designed to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk. Cash flow hedges are designed to mitigate exposure to variability in expected future cash flows to be received or paid related to an asset, liability, or other type of forecasted transaction. The Company formally documents all relationships between hedging instruments and hedged items, including its risk management objective and strategy, at inception. At the hedge's inception, a formal assessment is performed to determine the effectiveness of the derivative in offsetting changes in the fair values or expected future cash flows of the hedged items in the current period and prospectively. If a derivative instrument designated as a hedge is terminated or ceases to be highly effective, hedge accounting is discontinued prospectively, and the gain or loss is amortized into earnings. For fair value hedges, the gain or loss is amortized over the remaining life of the hedged asset or liability. For cash flow hedges, the gain or loss is amortized over the same period that the forecasted hedged transactions impact earnings. If the hedged item is disposed of, any fair value adjustments are included in the gain or loss from the disposition of the hedged item. If the forecasted transaction is no longer probable, the gain or loss is included in earnings immediately. For fair value hedges, changes in the fair value of the derivative instruments, as well as changes in the fair value of the hedged item, are recognized in earnings in the same income statement line item as the earnings effect of the hedged item. For cash flow hedges, the effective portion of the change in fair value of the derivative instrument is reported as a component of accumulated other comprehensive income (loss) and is reclassified to earnings when the hedged transaction is reflected in earnings.
Recent Accounting Pronouncements	Adopted Accounting Pronouncements Changes to the Disclosure Requirements for Defined Benefit Plans: In August of 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update ("ASU") 2018-14 that makes minor changes and clarifications to the disclosure requirements for entities that sponsor defined benefit plans. This guidance is effective for annual and interim periods beginning after December 15, 2020. The adoption of this guidance on January 1, 2021 did not materially impact the Company's financial condition, results of operations, or liquidity. Income Taxes : In December of 2019, the FASB issued ASU 2019-12 that removes certain exceptions to the general principles of accounting for income taxes. This guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. The adoption of this guidance on January 1, 2021 did not materially impact the Company's financial condition, results of operations, or liquidity. Accounting Pronouncements Pending Adoption Reference Rate Reform : In March of 2020, the FASB issued ASU 2020-04 and in January of 2021, the FASB issued 2021-01, both of which provide optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued by reference rate reform, if certain criteria are met. This guidance is effective upon issuance as of March 12, 2020 and generally can be applied through December 31, 2022. Management continues to monitor efforts and evaluate the impact of reference rate reform, including this guidance and determining its impact on the Company's financial condition, results of operations, and liquidity.
Fair Value	Fair value represents the amount expected to be received to sell an asset or paid to transfer a liability in its principal or most advantageous market in an orderly transaction between market participants at the measurement date. In accordance with fair value accounting guidance, the Company measures, records, and reports various types of assets and liabilities at fair value on either a recurring or non-recurring basis in the Consolidated Statements of Financial Condition. Those assets and liabilities are presented below in the sections titled "Assets and Liabilities Required to be Measured at Fair Value on a Recurring Basis" and "Assets and Liabilities Required to be Measured at Fair Value on a Non-Recurring Basis." Other assets and liabilities are not required to be measured at fair value in the Consolidated Statements of Financial Condition, but must be disclosed at fair value. See the "Fair Value Measurements of Other Financial Instruments" section of this note. Any aggregation of the estimated fair values presented in this note does not represent the value of the Company. Depending on the nature of the asset or liability, the Company uses various valuation methodologies and assumptions to estimate fair value. GAAP provides a three-tiered fair value hierarchy based on the inputs used to measure fair value. The hierarchy is defined as follows: • Level 1 – Quoted prices in active markets for identical assets or liabilities. • Level 2 – Observable inputs other than level 1 prices, such as quoted prices for similar instruments, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data. • Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. These inputs require significant management judgment or estimation, some of which use model-based techniques and may be internally developed. Assets and liabilities are assigned to a level within the fair value hierarchy based on the lowest level of significant input used to measure fair value. Assets and liabilities may change levels within the fair value hierarchy due to market conditions or other circumstances. Those transfers are recognized on the date of the event that prompted the transfer. There were no transfers of assets or liabilities required to be measured at fair value on a recurring basis between levels of the fair value hierarchy during the periods presented.

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Schedule of Acquisition Activity	The following table presents the assets acquired and liabilities assumed, net of the fair value adjustments, in the Park Bank transaction as of the acquisition date. The assets acquired and liabilities assumed, both intangible and tangible, were recorded at their estimated fair values as of the acquisition date and have been accounted for under the acquisition method of accounting. Acquisition Activity (Dollar amounts in thousands, except share and per share data) Park Bank March 9, 2020 Assets Cash and due from banks and interest-bearing deposits in other banks $ 244,781 Securities available-for-sale 136,856 Securities held-to-maturity 300 Loans 687,923 OREO 2,276 Goodwill 59,649 Other intangible assets 3,068 Premises, furniture, and equipment 2,550 Accrued interest receivable and other assets 13,502 Total assets $ 1,150,905 Liabilities Noninterest-bearing deposits $ 356,050 Interest-bearing deposits 594,026 Total deposits 950,076 Borrowed funds 11,532 Accrued interest payable and other liabilities 14,915 Total liabilities 976,523 Consideration Paid Common stock (2020 – 4,930,231, shares issued at $14.58 per share) 71,883 Cash paid 102,499 Total consideration paid 174,382 $ 1,150,905

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Securities Available-for-Sale	A summary of the Company's securities portfolio by category and maturity is presented in the following tables. Securities Portfolio (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 Amortized Cost Gross Unrealized Fair Amortized Cost Gross Unrealized Fair Gains Losses Gains Losses Securities Available-for-Sale U.S. treasury securities $ — $ — $ — $ — $ 12,001 $ 50 $ — $ 12,051 U.S. agency securities 675,866 1,434 (21,188) 656,112 654,321 3,129 (4,976) 652,474 Collateralized mortgage obligations 1,304,762 11,633 (20,851) 1,295,544 1,415,312 27,529 (4,323) 1,438,518 Other mortgage-backed securities 854,852 8,170 (6,926) 856,096 566,830 14,650 (640) 580,840 Municipal securities 216,744 8,776 (902) 224,618 224,446 11,573 (4) 236,015 Corporate debt securities 173,061 7,477 — 180,538 170,570 6,210 (270) 176,510 Total securities available-for-sale $ 3,225,285 $ 37,490 $ (49,867) $ 3,212,908 $ 3,043,480 $ 63,141 $ (10,213) $ 3,096,408 Securities Held-to-Maturity Municipal securities $ 10,853 $ — $ (392) $ 10,461 $ 12,291 $ — $ (385) $ 11,906 Allowance for securities held-to- (220) $ (220) (220) $ (220) Total securities held-to-maturity, $ 10,633 $ — $ (392) $ 10,241 $ 12,071 $ — $ (385) $ 11,686 Equity Securities $ 114,848 $ 76,404
Securities Held-to-Maturity	A summary of the Company's securities portfolio by category and maturity is presented in the following tables. Securities Portfolio (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 Amortized Cost Gross Unrealized Fair Amortized Cost Gross Unrealized Fair Gains Losses Gains Losses Securities Available-for-Sale U.S. treasury securities $ — $ — $ — $ — $ 12,001 $ 50 $ — $ 12,051 U.S. agency securities 675,866 1,434 (21,188) 656,112 654,321 3,129 (4,976) 652,474 Collateralized mortgage obligations 1,304,762 11,633 (20,851) 1,295,544 1,415,312 27,529 (4,323) 1,438,518 Other mortgage-backed securities 854,852 8,170 (6,926) 856,096 566,830 14,650 (640) 580,840 Municipal securities 216,744 8,776 (902) 224,618 224,446 11,573 (4) 236,015 Corporate debt securities 173,061 7,477 — 180,538 170,570 6,210 (270) 176,510 Total securities available-for-sale $ 3,225,285 $ 37,490 $ (49,867) $ 3,212,908 $ 3,043,480 $ 63,141 $ (10,213) $ 3,096,408 Securities Held-to-Maturity Municipal securities $ 10,853 $ — $ (392) $ 10,461 $ 12,291 $ — $ (385) $ 11,906 Allowance for securities held-to- (220) $ (220) (220) $ (220) Total securities held-to-maturity, $ 10,633 $ — $ (392) $ 10,241 $ 12,071 $ — $ (385) $ 11,686 Equity Securities $ 114,848 $ 76,404
Equity Securities	A summary of the Company's securities portfolio by category and maturity is presented in the following tables. Securities Portfolio (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 Amortized Cost Gross Unrealized Fair Amortized Cost Gross Unrealized Fair Gains Losses Gains Losses Securities Available-for-Sale U.S. treasury securities $ — $ — $ — $ — $ 12,001 $ 50 $ — $ 12,051 U.S. agency securities 675,866 1,434 (21,188) 656,112 654,321 3,129 (4,976) 652,474 Collateralized mortgage obligations 1,304,762 11,633 (20,851) 1,295,544 1,415,312 27,529 (4,323) 1,438,518 Other mortgage-backed securities 854,852 8,170 (6,926) 856,096 566,830 14,650 (640) 580,840 Municipal securities 216,744 8,776 (902) 224,618 224,446 11,573 (4) 236,015 Corporate debt securities 173,061 7,477 — 180,538 170,570 6,210 (270) 176,510 Total securities available-for-sale $ 3,225,285 $ 37,490 $ (49,867) $ 3,212,908 $ 3,043,480 $ 63,141 $ (10,213) $ 3,096,408 Securities Held-to-Maturity Municipal securities $ 10,853 $ — $ (392) $ 10,461 $ 12,291 $ — $ (385) $ 11,906 Allowance for securities held-to- (220) $ (220) (220) $ (220) Total securities held-to-maturity, $ 10,633 $ — $ (392) $ 10,241 $ 12,071 $ — $ (385) $ 11,686 Equity Securities $ 114,848 $ 76,404
Remaining Contractual Maturity of Securities	Remaining Contractual Maturity of Securities (Dollar amounts in thousands) As of September 30, 2021 Available-for-Sale Held-to-Maturity Amortized Fair Amortized Fair One year or less $ 115,656 $ 115,178 $ 1,857 $ 1,790 After one year to five years 157,219 156,570 4,495 4,333 After five years to ten years 792,796 789,520 1,953 1,882 After ten years — — 2,548 2,456 Securities that do not have a single contractual maturity date 2,159,614 2,151,640 — — Total $ 3,225,285 $ 3,212,908 $ 10,853 $ 10,461
Securities in an Unrealized Loss Position	The following table presents the aggregate amount of unrealized losses and the aggregate related fair values of securities with unrealized losses as of September 30, 2021 and December 31, 2020. Securities in an Unrealized Loss Position (Dollar amounts in thousands) Less Than 12 Months 12 Months or Longer Total Number of Fair Unrealized Fair Unrealized Fair Unrealized As of September 30, 2021 Securities Available-for-Sale U.S. agency securities 74 $ 331,843 $ 10,834 $ 216,769 $ 10,354 $ 548,612 $ 21,188 CMOs 178 666,381 13,271 139,952 7,580 806,333 20,851 MBSs 85 349,060 5,751 59,373 1,175 408,433 6,926 Municipal securities 30 21,497 742 5,824 160 27,321 902 Total 367 $ 1,368,781 $ 30,598 $ 421,918 $ 19,269 $ 1,790,699 $ 49,867 As of December 31, 2020 Securities Available-for-Sale U.S. agency securities 48 $ 253,841 $ 4,764 $ 14,932 $ 212 $ 268,773 $ 4,976 CMOs 104 349,853 3,205 86,618 1,118 436,471 4,323 MBSs 19 69,838 550 12,307 90 82,145 640 Municipal securities 4 1,012 4 — — 1,012 4 Corporate debt securities 3 8,100 105 9,513 165 17,613 270 Total 178 $ 682,644 $ 8,628 $ 123,370 $ 1,585 $ 806,014 $ 10,213

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2021
Loans and Leases Receivable Disclosure [Abstract]
Composition Of Loan Portfolio	The following table presents the Company's loans held-for-investment by class. Loan Portfolio (Dollar amounts in thousands) As of September 30, December 31, Commercial and industrial $ 4,705,458 $ 4,578,254 Agricultural 349,159 364,038 Commercial real estate: Office, retail, and industrial 1,765,592 1,861,768 Multi-family 1,082,941 872,813 Construction 595,204 612,611 Other commercial real estate 1,408,955 1,481,976 Total commercial real estate 4,852,692 4,829,168 Total corporate loans, excluding Paycheck Protection Program ("PPP") loans 9,907,309 9,771,460 PPP loans 384,100 785,563 Total corporate loans 10,291,409 10,557,023 Home equity 591,126 761,725 1-4 family mortgages 3,332,732 3,022,413 Installment 573,465 410,071 Total consumer loans 4,497,323 4,194,209 Total loans $ 14,788,732 $ 14,751,232 Deferred loan fees included in total loans $ 8,688 $ 9,696 Overdrawn demand deposits included in total loans 8,562 8,444
Loan Sales and Purchases	The following table presents loan sales and purchases for the quarters and nine months ended September 30, 2021 and 2020. Loan Sales and Purchases (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2021 2020 2021 2020 Corporate loan sales Proceeds from sales $ — $ 50 $ 17,227 $ 4,648 Less book value of loans sold — 65 17,177 4,542 Net (losses) gains on corporate loan sales (1) — (15) 50 106 1-4 family mortgage loan sales Proceeds from sales 205,699 258,695 713,775 551,105 Less book value of loans sold 199,938 251,819 691,620 537,120 Net gains on 1-4 family mortgage loan sales (2) 5,761 6,876 22,155 13,985 Total net gains on loan sales $ 5,761 $ 6,861 $ 22,205 $ 14,091 Corporate loan purchases (3) Commercial and industrial $ 65,633 $ 10,196 $ 299,708 $ 178,912 Office, retail, and industrial 1,198 — 8,636 — Multi-family 7 — 26,136 — Construction 5 3,692 1,041 7,589 Other commercial real estate — — 35,000 10,000 Total corporate loan purchases $ 66,843 $ 13,888 $ 370,521 $ 196,501 Consumer loan purchases Home equity $ — $ — $ — $ 144,967 1-4 family mortgages 186,910 168,052 772,828 417,637 Installment — — 253,376 — Total consumer loan purchases $ 186,910 $ 168,052 $ 1,026,204 $ 562,604 (1) Net gains on corporate loan sales are included in other service charges, commissions, and fees in the Condensed Consolidated Statements of Income. (2) Net gains on 1-4 family mortgage loan sales are included in mortgage banking income in the Condensed Consolidated Statements of Income. (3) Consists of the Company's portion of loan participations purchased.

Acquired Loans (Tables)

Acquired Loans (Tables)	9 Months Ended
	Sep. 30, 2021
Transfers and Servicing [Abstract]
Schedule of Acquired Loans	The following table presents the carrying amount of acquired loans as of September 30, 2021 and December 31, 2020. Acquired Loans (1) (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 PCD Non-PCD Total PCD Non-PCD Total Acquired loans $ 161,154 $ 787,636 $ 948,790 $ 212,021 $ 1,198,818 $ 1,410,839 (1) Included in loans in the Consolidated Statements of Financial Condition.

Past Due Loans, Allowance For_2

Past Due Loans, Allowance For Credit Losses, Non-Accrual Loans, and TDRS (Tables)	9 Months Ended
	Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Past Due Financing Receivables	The following table presents an aging analysis of the Company's past due loans as of September 30, 2021 and December 31, 2020 with balances presented on an amortized cost basis. The aging is determined without regard to accrual status. The table also presents non-performing loans, consisting of non-accrual loans (the majority of which are past due) and loans 90 days or more past due and still accruing interest, as of each balance sheet date. Aging Analysis of Past Due Loans and Non-performing Loans by Class (Dollar amounts in thousands) Aging Analysis (Accruing and Non-accrual) Non-performing Loans Current 30-89 Days 90 Days or Total Total Non- 90 Days or More Past Due, Still Accruing Interest As of September 30, 2021 Commercial and industrial $ 4,687,711 $ 6,475 $ 11,272 $ 17,747 $ 4,705,458 $ 14,616 $ 722 Agricultural 344,374 1,388 3,397 4,785 349,159 6,682 — Commercial real estate: Office, retail, and industrial 1,738,178 15,351 12,063 27,414 1,765,592 20,632 — Multi-family 1,077,754 2,085 3,102 5,187 1,082,941 3,450 — Construction 592,433 920 1,851 2,771 595,204 1,851 — Other commercial real estate 1,388,152 6,314 14,489 20,803 1,408,955 18,060 32 Total commercial real estate 4,796,517 24,670 31,505 56,175 4,852,692 43,993 32 Total corporate loans, 9,828,602 32,533 46,174 78,707 9,907,309 65,291 754 PPP loans 384,100 — — — 384,100 — — Total corporate loans 10,212,702 32,533 46,174 78,707 10,291,409 65,291 754 Home equity 585,157 2,043 3,926 5,969 591,126 10,006 75 1-4 family mortgages 3,319,223 3,978 9,531 13,509 3,332,732 12,786 — Installment 570,600 2,401 464 2,865 573,465 — 464 Total consumer loans 4,474,980 8,422 13,921 22,343 4,497,323 22,792 539 Total loans $ 14,687,682 $ 40,955 $ 60,095 $ 101,050 $ 14,788,732 $ 88,083 $ 1,293 As of December 31, 2020 Commercial and industrial $ 4,530,546 $ 9,254 $ 38,454 $ 47,708 $ 4,578,254 $ 42,965 $ 591 Agricultural 359,373 705 3,960 4,665 364,038 10,719 — Commercial real estate: Office, retail, and industrial 1,827,891 3,961 29,916 33,877 1,861,768 34,224 257 Multi-family 867,815 2,510 2,488 4,998 872,813 2,488 — Construction 606,934 1,154 4,523 5,677 612,611 4,980 1,065 Other commercial real estate 1,448,258 15,015 18,703 33,718 1,481,976 25,824 434 Total commercial real estate 4,750,898 22,640 55,630 78,270 4,829,168 67,516 1,756 Total corporate loans, 9,640,817 32,599 98,044 130,643 9,771,460 121,200 2,347 PPP loans 785,563 — — — 785,563 — — Total corporate loans 10,426,380 32,599 98,044 130,643 10,557,023 121,200 2,347 Home equity 750,263 5,563 5,899 11,462 761,725 10,795 956 1-4 family mortgages 3,009,564 5,296 7,553 12,849 3,022,413 10,530 115 Installment 404,831 4,263 977 5,240 410,071 — 977 Total consumer loans 4,164,658 15,122 14,429 29,551 4,194,209 21,325 2,048 Total loans $ 14,591,038 $ 47,721 $ 112,473 $ 160,194 $ 14,751,232 $ 142,525 $ 4,395
Allowance for Credit Losses on Financing Receivables	A rollforward of the allowance for credit losses by portfolio segment for the quarters and nine months ended September 30, 2021 and 2020 is presented in the table below. PPP loans are excluded from this table as there is no allowance for credit losses associated with these loans because they are fully guaranteed by the U.S. Small Business Administration ("SBA"). Allowance for Credit Losses by Portfolio Segment (Dollar amounts in thousands) Commercial, Office, Multi- Construction Other Consumer Allowance for Total Quarter Ended September 30, 2021 Beginning balance $ 116,396 $ 17,992 $ 3,459 $ 4,924 $ 20,058 $ 51,772 $ 8,625 $ 223,226 Charge-offs (7,081) (673) (1) (1,153) (857) (1,992) — (11,757) Recoveries 2,116 117 — 167 28 969 — 3,397 Net charge-offs (4,965) (556) (1) (986) (829) (1,023) — (8,360) Provision for loan 508 272 172 (210) 693 (1,435) — — Ending balance $ 111,939 $ 17,708 $ 3,630 $ 3,728 $ 19,922 $ 49,314 $ 8,625 $ 214,866 Quarter Ended September 30, 2020 Beginning balance $ 123,977 $ 24,441 $ 5,311 $ 11,522 $ 21,862 $ 52,939 $ 7,625 $ 247,677 Allowance established (1,188) — — — — — — (1,188) Charge-offs (6,853) (1,344) — (4,889) (1,823) (2,629) — (17,538) Recoveries 1,118 5 — — 70 602 — 1,795 Net charge-offs (5,735) (1,339) — (4,889) (1,753) (2,027) — (15,743) Provision for loan 8,674 1,636 428 99 3,522 1,568 200 16,127 Ending balance $ 125,728 $ 24,738 $ 5,739 $ 6,732 $ 23,631 $ 52,480 $ 7,825 $ 246,873 Nine Months Ended September 30, 2021 Beginning balance $ 119,954 $ 24,078 $ 5,709 $ 6,674 $ 24,309 $ 58,293 $ 8,025 $ 247,042 Charge-offs (26,688) (9,048) (5) (1,371) (1,928) (7,661) — (46,701) Recoveries 4,887 237 7 177 269 2,250 — 7,827 Net charge-offs (21,801) (8,811) 2 (1,194) (1,659) (5,411) — (38,874) Provision for loan 13,786 2,441 (2,081) (1,752) (2,728) (3,568) 600 6,698 Ending balance $ 111,939 $ 17,708 $ 3,630 $ 3,728 $ 19,922 $ 49,314 $ 8,625 $ 214,866 Nine Months Ended September 30, 2020 Beginning balance $ 62,830 $ 7,580 $ 2,950 $ 1,697 $ 6,408 $ 26,557 $ 1,200 $ 109,222 Adjustment to apply recent accounting pronouncements (1) 20,159 11,686 397 10,300 11,427 16,235 5,553 75,757 Allowance established 11,452 2,003 — — — 39 872 14,366 Charge-offs (19,592) (4,774) (19) (7,495) (2,162) (11,660) — (45,702) Recoveries 3,097 20 5 — 226 1,574 — 4,922 Net charge-offs (16,495) (4,754) (14) (7,495) (1,936) (10,086) — (40,780) Provision for loan 47,782 8,223 2,406 2,230 7,732 19,735 200 88,308 Ending balance $ 125,728 $ 24,738 $ 5,739 $ 6,732 $ 23,631 $ 52,480 $ 7,825 $ 246,873 (1) As a result of accounting guidance adopted in the first quarter of 2020, the increase in allowance for credit losses, net of tax, was recognized as a cumulative-effect adjustment to retained earnings as of January 1, 2020.
Schedule of Loans and The Related Allowance For Credit Losses	The table below provides a breakdown of loans and the related allowance for credit losses by portfolio segment as of September 30, 2021 and December 31, 2020. Loans and Related Allowance for Credit Losses by Portfolio Segment (Dollar amounts in thousands) Loans Allowance for Credit Losses Individually Collectively PCD Total Individually Collectively PCD Total As of September 30, 2021 Commercial, industrial, $ 14,580 $ 4,993,501 $ 46,536 $ 5,054,617 $ 1,499 $ 105,470 $ 4,970 $ 111,939 Commercial real estate: Office, retail, and industrial 12,498 1,719,005 34,089 1,765,592 384 13,902 3,422 17,708 Multi-family 2,171 1,074,323 6,447 1,082,941 — 3,555 75 3,630 Construction 1,154 582,683 11,367 595,204 — 3,406 322 3,728 Other commercial real estate 11,993 1,353,603 43,359 1,408,955 164 10,083 9,675 19,922 Total commercial real estate 27,816 4,729,614 95,262 4,852,692 548 30,946 13,494 44,988 Total corporate loans, 42,396 9,723,115 141,798 9,907,309 2,047 136,416 18,464 156,927 PPP loans — 384,100 — 384,100 — — — — Total corporate loans 42,396 10,107,215 141,798 10,291,409 2,047 136,416 18,464 156,927 Consumer — 4,477,967 19,356 4,497,323 — 48,815 499 49,314 Allowance for unfunded — — — — — 8,625 — 8,625 Total loans $ 42,396 $ 14,585,182 $ 161,154 $ 14,788,732 $ 2,047 $ 193,856 $ 18,963 $ 214,866 As of December 31, 2020 Commercial, industrial, and $ 45,650 $ 4,826,017 $ 70,625 $ 4,942,292 $ 3,536 $ 107,763 $ 8,655 $ 119,954 Commercial real estate: Office, retail, and industrial 26,384 1,792,618 42,766 1,861,768 1,123 15,106 7,849 24,078 Multi-family 1,279 864,677 6,857 872,813 — 5,438 271 5,709 Construction 1,154 595,550 15,907 612,611 — 4,535 2,139 6,674 Other commercial real estate 13,736 1,414,541 53,699 1,481,976 171 12,651 11,487 24,309 Total commercial real estate 42,553 4,667,386 119,229 4,829,168 1,294 37,730 21,746 60,770 Total corporate loans, 88,203 9,493,403 189,854 9,771,460 4,830 145,493 30,401 180,724 PPP loans — 785,563 — 785,563 — — — — Total corporate loans 88,203 10,278,966 189,854 10,557,023 4,830 145,493 30,401 180,724 Consumer — 4,172,042 22,167 4,194,209 — 57,567 726 58,293 Allowance for unfunded — — — — — 8,025 — 8,025 Total loans $ 88,203 $ 14,451,008 $ 212,021 $ 14,751,232 $ 4,830 $ 211,085 $ 31,127 $ 247,042
Impaired Financing Receivables	The following table presents collateral-dependent loans, including PCD loans, without regard to accrual status by primary collateral type and non-accrual loans with no related allowance as of September 30, 2021 and December 31, 2020. PPP loans are excluded from this table as there is no allowance for credit losses associated with these loans because they are fully guaranteed by the SBA. Collateral-dependent Loans and Non-accrual Loans With No Related Allowance by Class (Dollar amounts in thousands) Type of Collateral Non-accrual Loans Real Blanket Equipment As of September 30, 2021 Commercial and industrial $ 4,296 $ 11,572 $ 923 $ 10,619 Agricultural 6,445 — — 2,784 Commercial real estate: Office, retail, and industrial 20,285 — — 11,868 Multi-family 2,950 — — 2,950 Construction 2,223 — — 327 Other commercial real estate 30,952 — — 6,475 Total commercial real estate 56,410 — — 21,620 Total corporate loans 67,151 11,572 923 35,023 Home equity 96 — — 96 1-4 family mortgages 1,130 — — — Installment — — — — Total consumer loans 1,226 — — 96 Total loans $ 68,377 $ 11,572 $ 923 $ 35,119 As of December 31, 2020 Commercial and industrial $ 27,007 $ 35,632 $ 2,555 $ 36,686 Agricultural 8,583 1,737 — 5,213 Commercial real estate: Office, retail, and industrial 42,790 — — 23,508 Multi-family 2,097 — — 1,279 Construction 5,370 — — 1,831 Other commercial real estate 40,430 — — 20,158 Total commercial real estate 90,687 — — 46,776 Total corporate loans 126,277 37,369 2,555 88,675 Home equity 211 — — 99 1-4 family mortgages 2,807 — — 578 Installment — — — — Total consumer loans 3,018 — — 677 Total loans $ 129,295 $ 37,369 $ 2,555 $ 89,352 Loans Individually Evaluated The following table presents loans individually evaluated by class of loan as of September 30, 2021 and December 31, 2020. PCD loans are excluded from this disclosure. Loans Individually Evaluated by Class (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 Recorded Investment In Recorded Investment In Loans with Loans with Unpaid Specific Loans with Loans with Unpaid Specific Commercial and industrial $ 7,284 $ 850 $ 22,314 $ 294 $ 33,643 $ 1,687 $ 40,055 $ 398 Agricultural 2,784 3,662 10,917 1,205 5,213 5,107 14,972 3,138 Commercial real estate: Office, retail, and industrial 10,643 1,855 14,849 384 21,537 4,847 30,474 1,123 Multi-family 2,171 — 2,171 — 1,279 — 1,279 — Construction — 1,154 1,182 — 1,154 — 1,507 — Other commercial real estate 2,593 9,400 12,863 164 12,822 914 14,240 171 Total commercial real estate 15,407 12,409 31,065 548 36,792 5,761 47,500 1,294 Total corporate loans 25,475 16,921 64,296 2,047 75,648 12,555 102,527 4,830 Consumer — — — — — — — — Total non-accrual loans $ 25,475 $ 16,921 $ 64,296 $ 2,047 $ 75,648 $ 12,555 $ 102,527 $ 4,830
Financing Receivable Credit Quality Indicators	The following tables present credit quality indicators for corporate and consumer loans on an amortized cost basis as of September 30, 2021 and net loan charge-offs for the nine months ended September 30, 2021. PPP loans are excluded from this table as there is no allowance for credit losses associated with these loans because they are fully guaranteed by the SBA. For a summary of credit quality indicators as of December 31, 2020, see Note 7, "Past Due Loans, Allowance for Credit Losses, Impaired Loans, and TDRs," in the Company's 2020 10-K. Corporate Loan Portfolio by Origination Year (Dollar amounts in thousands) 2021 (1) 2020 2019 2018 2017 Prior Revolving Loans Total Commercial, industrial, agricultural: Pass $ 752,464 $ 641,813 $ 723,079 $ 588,007 $ 308,785 $ 430,650 $ 1,280,272 $ 4,725,070 Special Mention (2) 2,370 894 26,523 37,174 20,750 32,822 36,094 156,627 Substandard (3) 252 2,039 21,011 64,985 22,195 19,296 21,844 151,622 Non-accrual (4) — 1,046 1,587 2,432 2,141 13,128 964 21,298 Total commercial, $ 755,086 $ 645,792 $ 772,200 $ 692,598 $ 353,871 $ 495,896 $ 1,339,174 $ 5,054,617 Commercial, industrial, $ — $ 835 $ 4,738 $ 4,745 $ 9,770 $ (873) $ 2,586 $ 21,801 Office, retail, and industrial: Pass $ 139,452 $ 138,270 $ 205,148 $ 157,894 $ 238,194 $ 727,319 $ 14,479 $ 1,620,756 Special Mention (2) 1,717 312 4,577 3,301 17,234 35,009 — 62,150 Substandard (3) 732 628 — 15,922 5,330 39,442 — 62,054 Non-accrual (4) — — — — 324 20,308 — 20,632 Total office, retail, $ 141,901 $ 139,210 $ 209,725 $ 177,117 $ 261,082 $ 822,078 $ 14,479 $ 1,765,592 Office, retail, and $ — $ — $ 246 $ 3,899 $ 1,023 $ 3,643 $ — $ 8,811 Multi-family: Pass $ 220,347 $ 154,304 $ 153,338 $ 80,207 $ 117,350 $ 277,778 $ 18,237 $ 1,021,561 Special Mention (2) — — 5,775 4,385 — 31,356 — 41,516 Substandard (3) — — — 378 70 15,966 — 16,414 Non-accrual (4) — — — — 935 2,515 — 3,450 Total multi-family $ 220,347 $ 154,304 $ 159,113 $ 84,970 $ 118,355 $ 327,615 $ 18,237 $ 1,082,941 Multi-family net loan $ — $ — $ — $ — $ 5 $ (7) $ — $ (2) Construction: Pass $ 62,941 $ 135,694 $ 89,579 $ 133,832 $ 62,946 $ 73,511 $ 24,970 $ 583,473 Special Mention (2) — — — 38 — 162 — 200 Substandard (3) — — — — 1,392 8,288 — 9,680 Non-accrual (4) — — — — 1,154 697 — 1,851 Total construction $ 62,941 $ 135,694 $ 89,579 $ 133,870 $ 65,492 $ 82,658 $ 24,970 $ 595,204 Construction net loan $ — $ — $ — $ — $ 1,104 $ 49 $ 41 $ 1,194 Other commercial real estate: Pass $ 180,456 $ 167,456 $ 157,047 $ 206,984 $ 138,750 $ 335,895 $ 23,160 $ 1,209,748 Special Mention (2) — — 24,396 12,462 10,464 22,403 — 69,725 Substandard (3) — — 1,912 30,358 20,727 58,183 242 111,422 Non-accrual (4) — — — 205 1,056 16,658 141 18,060 Total other $ 180,456 $ 167,456 $ 183,355 $ 250,009 $ 170,997 $ 433,139 $ 23,543 $ 1,408,955 Other commercial real $ — $ — $ — $ 245 $ 11 $ 1,403 $ — $ 1,659 (1) Represents year-to-date loans originated during 2021. (2) Loans categorized as special mention exhibit potential weaknesses that require the close attention of management since these potential weaknesses may result in the deterioration of repayment prospects in the future. (3) Loans categorized as substandard exhibit well-defined weaknesses that may jeopardize the liquidation of the debt. These loans continue to accrue interest because they are well-secured, and collection of principal and interest is expected within a reasonable time. (4) Loans categorized as non-accrual exhibit well-defined weaknesses that may jeopardize the liquidation of the debt or result in a loss if the deficiencies are not corrected. Consumer Loan Portfolio by Origination Year (Dollar amounts in thousands) 2021 (1) 2020 2019 2018 2017 Prior Revolving Loans Total Home equity: Performing $ 7,471 $ 10,778 $ 8,168 $ 9,650 $ 8,508 $ 48,409 $ 488,136 $ 581,120 Non-accrual — — 62 453 223 7,049 2,219 10,006 Total home equity $ 7,471 $ 10,778 $ 8,230 $ 10,103 $ 8,731 $ 55,458 $ 490,355 $ 591,126 Home equity net $ — $ — $ — $ 27 $ (42) $ (347) $ (26) $ (388) 1-4 family mortgages: Performing $ 908,935 $ 1,579,102 $ 379,230 $ 118,836 $ 74,276 $ 258,947 $ 620 $ 3,319,946 Non-accrual — 982 380 627 636 10,161 — 12,786 Total 1-4 family $ 908,935 $ 1,580,084 $ 379,610 $ 119,463 $ 74,912 $ 269,108 $ 620 $ 3,332,732 1-4 family mortgages $ — $ — $ — $ 2 $ — $ 247 $ — $ 249 Installment: Performing $ 165,389 $ 132,025 $ 108,820 $ 74,939 $ 31,654 $ 18,255 $ 42,383 $ 573,465 Non-accrual — — — — — — — — Total installment $ 165,389 $ 132,025 $ 108,820 $ 74,939 $ 31,654 $ 18,255 $ 42,383 $ 573,465 Installment net loan $ 247 $ 1,323 $ 2,590 $ 1,439 $ 97 $ (182) $ 36 $ 5,550 (1) Represents year-to-date loans originated during 2021. During the quarter and nine months ended September 30, 2021, $12.9 million and $34.0 million, respectively, and $5.2 million and $29.0 million, for the same periods in 2020, of revolving loans converted to term loans.
Troubled Debt Restructuring Activity Rollforward	The table below presents TDRs by class as of September 30, 2021 and December 31, 2020. See Note 1, "Summary of Significant Accounting Policies," for the accounting policy for TDRs. TDRs by Class (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 Accruing Non-accrual (1) Total Accruing Non-accrual (1) Total Commercial and industrial $ — $ 6,255 $ 6,255 $ — $ 8,859 $ 8,859 Agricultural — — — — — — Commercial real estate: Office, retail, and industrial — — — — 2,340 2,340 Multi-family — 151 151 — 160 160 Construction — — — — — — Other commercial real estate 155 — 155 184 — 184 Total commercial real estate 155 151 306 184 2,500 2,684 Total corporate loans 155 6,406 6,561 184 11,359 11,543 Home equity 29 103 132 31 116 147 1-4 family mortgages 355 217 572 598 228 826 Installment — — — — — — Total consumer loans 384 320 704 629 344 973 Total loans $ 539 $ 6,726 $ 7,265 $ 813 $ 11,703 $ 12,516 (1) These TDRs are included in non-accrual loans in the preceding tables. A rollforward of the carrying value of TDRs for the quarters and nine months ended September 30, 2021 and 2020 is presented in the following table. TDR Rollforward (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2021 2020 2021 2020 Accruing Beginning balance $ 782 $ 1,201 $ 813 $ 1,233 Additions — — — — Net payments (243) (13) (274) (45) Net transfers to non-accrual — (347) — (347) Ending balance 539 841 539 841 Non-accrual Beginning balance 7,403 12,093 11,703 20,514 Additions — 11,636 — 11,636 Net payments (677) (5,886) (3,951) (8,205) Charge-offs — (2,353) (1,026) (8,455) Net transfers from accruing — 347 — 347 Ending balance 6,726 15,837 6,726 15,837 Total TDRs $ 7,265 $ 16,678 $ 7,265 $ 16,678

Lease Obligations (Tables)

Lease Obligations (Tables)	9 Months Ended
	Sep. 30, 2021
Leases [Abstract]
Schedule of Future Minimum Lease Liability	The following summary reflects the future minimum payments by year required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year and a reconciliation of those payments to the Company's lease liability as of September 30, 2021. Lease Liability (Dollar amounts in thousands) As of Year Ending December 31, 2021 $ 5,670 2022 22,517 2023 22,624 2024 22,502 2025 21,317 2026 and thereafter 96,149 Total minimum lease payments 190,779 Discount (1) (23,349) Lease liability (2) $ 167,430 (1) Represents the net present value adjustment related to minimum lease payments. (2) Included in accrued interest payable and other liabilities
Schedule of Net Operating Lease Expense	The following table presents net operating lease expense for the quarters and nine months ended September 30, 2021 and 2020. Net Operating Lease Expense (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2021 2020 2021 2020 Lease expense charged to operations $ 4,558 $ 4,739 $ 13,610 $ 14,253 Rental income from premises leased to others (1) (71) (158) (293) (556) Net operating lease expense $ 4,487 $ 4,581 $ 13,317 $ 13,697 (1) Included as reductions to net occupancy and equipment expense in the Condensed Consolidated Statements of Income.

Borrowed Funds (Tables)

Borrowed Funds (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Summary of Borrowed Funds	The following table summarizes the Company's borrowed funds by funding source. Summary of Borrowed Funds (Dollar amounts in thousands) As of September 30, December 31, Securities sold under agreements to repurchase $ 124,044 $ 141,886 FHLB advances 1,150,528 1,404,528 Total borrowed funds $ 1,274,572 $ 1,546,414
Short Term Credit Lines Available For Use	The following table presents short-term credit lines available for use, for which the Company did not have an outstanding balance as of September 30, 2021 and December 31, 2020. Short-Term Credit Lines Available for Use (Dollar amounts in thousands) As of September 30, December 31, FRB's Discount Window Primary Credit Program $ 857,758 $ 864,867 Available federal funds lines 982,000 844,000 Correspondent bank line of credit — 50,000

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The table below displays the calculation of basic and diluted earnings per common share ("EPS"). Basic and Diluted EPS (Amounts in thousands, except per share data) Quarters Ended Nine Months Ended 2021 2020 2021 2020 Net income $ 54,863 $ 27,623 $ 151,007 $ 66,293 Preferred dividends (4,033) (4,033) (12,101) (5,070) Net income applicable to unvested restricted shares (517) (236) (1,524) (615) Net income applicable to common shares $ 50,313 $ 23,354 $ 137,382 $ 60,608 Weighted-average common shares outstanding: Weighted-average common shares outstanding (basic) 112,898 113,160 112,953 112,079 Dilutive effect of common stock equivalents 878 276 789 322 Weighted-average diluted common shares outstanding 113,776 113,436 113,742 112,401 Basic EPS $ 0.45 $ 0.21 $ 1.22 $ 0.54 Diluted EPS $ 0.44 $ 0.21 $ 1.21 $ 0.54

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Interest Rate Derivatives	Cash Flow Hedges (Dollar amounts in thousands) As of September 30, 2021 December 31, 2020 Gross notional amount outstanding $ 455,000 $ 455,000 Derivative asset fair value in other assets (1) 460 3,707 Derivative liability fair value in other liabilities (1) — (1) Weighted-average interest rate received 2.18 % 2.18 % Weighted-average interest rate paid 0.08 % 0.15 % Weighted-average maturity (in years) 0.75 1.50 (1) Certain cash flow hedges are transacted through a clearinghouse ("centrally cleared") and their change in fair value is settled by the counterparties to the transaction, which results in no fair value. The following table presents the impact of derivative instruments on net interest income for the quarters and nine months ended September 30, 2021 and 2020. Hedge Income (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2021 2020 2021 2020 Cash Flow Hedges Interest rate swaps in interest income $ 2,238 $ 2,165 $ 6,668 $ 5,234 Interest rate swaps in interest expense — (16,350) — (16,350) Total cash flow hedges $ 2,238 $ (14,185) $ 6,668 $ (11,116)
Schedule of Derivative Instruments	Other Derivative Instruments (Dollar amounts in thousands) As of September 30, 2021 December 31, 2020 Gross notional amount outstanding $ 4,564,808 $ 4,491,398 Derivative asset fair value in other assets (1) 90,710 149,997 Derivative liability fair value in other liabilities (1) (30,729) (44,580) Fair value of derivative (2) 32,262 46,018 (1) Certain other derivative instruments are centrally cleared and their change in fair value is settled by the counterparties to the transaction, which results in no fair value. (2) This amount represents the fair value if credit risk related contingent features were triggered.
Cash Flow Hedge Accounting on AOCI	The following table presents the impact of derivative instruments on comprehensive income (loss) and the reclassification of gains (losses) from accumulated other comprehensive income (loss) to net interest income for the quarters and nine months ended September 30, 2021 and 2020. Cash Flow Hedge Accounting on AOCI (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2021 2020 2021 2020 (Losses) gains recognized in other comprehensive income Interest rate swaps in interest income $ (119) $ 96 $ 235 $ 28,051 Interest rate swaps in interest expense (28) (239) (730) (13,924) Reclassification of gains (losses) included in net income Interest rate swaps in interest income $ 2,238 $ 2,165 $ 6,668 $ 5,234 Interest rate swaps in interest expense — (16,350) — (16,350)
Offsetting Assets	The following table presents the fair value of the Company's derivatives and offsetting positions as of September 30, 2021 and December 31, 2020. Fair Value of Offsetting Derivatives (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 Assets Liabilities Assets Liabilities Gross amounts recognized $ 91,170 $ 30,729 $ 153,704 $ 44,581 Less: amounts offset in the Consolidated Statements of — — — — Net amount presented in the Consolidated Statements of Financial Condition (1) 91,170 30,729 153,704 44,581 Gross amounts not offset in the Consolidated Statements of Offsetting derivative positions (2,285) (2,285) (5,239) (5,239) Cash collateral pledged — (26,470) — (39,970) Net credit exposure $ 88,885 $ 1,974 $ 148,465 $ (628) (1) Included in other assets or other liabilities in the Consolidated Statements of Financial Condition.
Offsetting Liabilities	The following table presents the fair value of the Company's derivatives and offsetting positions as of September 30, 2021 and December 31, 2020. Fair Value of Offsetting Derivatives (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 Assets Liabilities Assets Liabilities Gross amounts recognized $ 91,170 $ 30,729 $ 153,704 $ 44,581 Less: amounts offset in the Consolidated Statements of — — — — Net amount presented in the Consolidated Statements of Financial Condition (1) 91,170 30,729 153,704 44,581 Gross amounts not offset in the Consolidated Statements of Offsetting derivative positions (2,285) (2,285) (5,239) (5,239) Cash collateral pledged — (26,470) — (39,970) Net credit exposure $ 88,885 $ 1,974 $ 148,465 $ (628) (1) Included in other assets or other liabilities in the Consolidated Statements of Financial Condition.

Commitments, Guarantees, and _2

Commitments, Guarantees, and Contingent Liabilities (Tables)	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Schedule of Contractual or Notional Amounts of Financial Instruments	Contractual or Notional Amounts of Financial Instruments (Dollar amounts in thousands) As of September 30, 2021 December 31, 2020 Commitments to extend credit: Commercial, industrial, and agricultural $ 2,313,362 $ 2,318,346 Commercial real estate 515,624 378,282 Home equity 608,440 611,640 Other commitments (1) 273,734 264,869 Total commitments to extend credit $ 3,711,160 $ 3,573,137 Letters of credit $ 114,797 $ 115,130 (1) Other commitments includes installment and overdraft protection program commitments.

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring Basis	The following table provides the fair value for assets and liabilities required to be measured at fair value on a recurring basis in the Consolidated Statements of Financial Condition by level in the fair value hierarchy. Recurring Fair Value Measurements (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Assets Equity securities $ 87,232 $ 22,616 $ — $ 52,888 $ 18,516 $ — Securities available-for-sale U.S. treasury securities — — — 12,051 — — U.S. agency securities — 656,112 — — 652,474 — CMOs — 1,295,544 — — 1,438,518 — MBSs — 856,096 — — 580,840 — Municipal securities — 224,618 — — 236,015 — Corporate debt securities — 180,538 — — 176,510 — Total securities available-for-sale — 3,212,908 — 12,051 3,084,357 — Mortgage servicing rights ("MSRs") (1) — — 6,306 — — 4,899 Derivative assets (1) — 91,170 — — 153,704 — Liabilities Derivative liabilities (2) $ — $ 30,729 $ — $ — $ 44,581 $ — (1) Included in other assets in the Consolidated Statements of Financial Condition. (2) Included in other liabilities in the Consolidated Statements of Financial Condition.
Significant Unobservable Inputs Used in the Valuation of MSRs	The following table presents the ranges of significant, unobservable inputs used by the Company to determine the fair value of MSRs as of September 30, 2021 and December 31, 2020. Significant Unobservable Inputs Used in the Valuation of MSRs As of September 30, 2021 December 31, 2020 Prepayment speed 2.4 % - 15.4% 5.3 % - 16.3% Maturity (months) 14 - 82 13 - 71 Discount rate 9.5 % - 15.0% 9.5 % - 12.0%
Schedule of Servicing Assets at Fair Value	A rollforward of the carrying value of MSRs for the quarters and nine months ended September 30, 2021 and 2020 is presented in the following table. Carrying Value of MSRs (Dollar amounts in thousands) Quarters Ended Nine Months Ended 2021 2020 2021 2020 Beginning balance $ 6,269 $ 4,464 $ 4,899 $ 5,858 New MSRs 267 727 1,834 1,628 Total gains (losses) included in earnings (1) : Changes in valuation inputs and assumptions 137 (432) 603 (2,090) Other changes in fair value (2) (367) (301) (1,030) (938) Ending balance (3) $ 6,306 $ 4,458 $ 6,306 $ 4,458 Contractual servicing fees earned (1) $ 512 $ 424 $ 1,472 $ 1,221 (1) Included in mortgage banking income in the Condensed Consolidated Statements of Income and related to assets held as of September 30, 2021 and 2020. (2) Primarily represents changes in expected future cash flows due to payoffs and paydowns. (3) Included in other assets in the Consolidated Statements of Financial Condition.
Fair Value Measurements, Nonrecurring	The following table provides the fair value for each class of assets and liabilities required to be measured at fair value on a non-recurring basis in the Consolidated Statements of Financial Condition by level in the fair value hierarchy. Non-Recurring Fair Value Measurements (Dollar amounts in thousands) As of September 30, 2021 As of December 31, 2020 Level 1 Level 2 Level 3 Level 1 Level 2 Level 3 Collateral-dependent non-accrual loans (1) $ — $ — $ 25,198 $ — $ — $ 21,246 OREO (2) — — 2,000 — — — Loans held-for-sale (3) — — 15,725 — — 44,965 Assets held-for-sale (4) — — 3,438 — — 3,722 (1) Includes non-accrual loans with charge-offs and non-accrual loans with a specific allowance during the periods presented. (2) Includes OREO with fair value adjustments subsequent to initial transfer that occurred during the periods presented. (3) Included in other assets in the Consolidated Statements of Financial Condition. (4) Included in premises, furniture, and equipment in the Consolidated Statements of Financial Condition.
Fair Value, by Balance Sheet Grouping	For certain financial instruments that are not required to be measured at fair value in the Consolidated Statements of Financial Condition, the Company must disclose the estimated fair values and the level within the fair value hierarchy as shown in the following table. Fair Value Measurements of Other Financial Instruments (Dollar amounts in thousands) As of September 30, 2021 December 31, 2020 Fair Value Hierarchy Carrying Fair Value Carrying Fair Value Assets Cash and due from banks 1 $ 270,020 $ 270,020 $ 196,364 $ 196,364 Interest-bearing deposits in other banks 2 1,654,917 1,654,917 920,880 920,880 Securities held-to-maturity 2 10,853 10,461 12,071 11,686 FHLB and FRB stock 2 106,090 106,090 117,420 117,420 Loans 3 14,582,491 14,425,048 14,512,215 14,614,029 Investment in BOLI 3 300,387 300,387 301,101 301,101 Accrued interest receivable 3 62,018 62,018 68,390 68,390 Liabilities Deposits 2 $ 17,198,402 $ 17,199,593 $ 16,012,464 $ 16,007,133 Borrowed funds 2 1,274,572 1,274,572 1,546,414 1,546,414 Senior and subordinated debt 2 235,383 283,439 234,768 281,843 Accrued interest payable 2 2,915 2,915 4,826 4,826

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 01, 2021	Mar. 09, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Acquisition and integration related expenses			$ 2,916	$ 881	$ 10,934	$ 11,602
Depository Series A Shares
Business Acquisition [Line Items]
Preferred stock, fixed rate (as a percent)				7.00%
Preferred stock, conversion rate (as a percent)				2.50%
Old National Bancorp
Business Acquisition [Line Items]
Total combined assets	$ 45,000,000
Common stock, shares issued (in shares)	1.1336
Percentage of votes approved	99.00%
Consideration transferred	$ 6,500,000
Old National Bancorp | Depository Series A Shares
Business Acquisition [Line Items]
Preferred stock, fixed rate (as a percent)	7.00%
Preferred stock, conversion rate (as a percent)	2.50%
Bankmanagers Corporation
Business Acquisition [Line Items]
Common stock, shares issued (in shares)		4,930,231
Consideration transferred		$ 174,382
Total assets		1,150,905
Total deposits		950,076
Loans		$ 687,923
Fixed exchange ratio (in shares)		29.9675
Cash paid per share (in dollars per share)		$ 623.02
Special dividends paid (in dollars per share)		$ 346
Cash paid		$ 102,499
Goodwill		$ 59,649

Acquisitions - Schedule of Acqu

Acquisitions - Schedule of Acquisition Activity (Details) - Bankmanagers Corporation $ / shares in Units, $ in Thousands	Mar. 09, 2020USD ($)$ / sharesshares
Assets
Cash and due from banks and interest-bearing deposits in other banks	$ 244,781
Securities available-for-sale	136,856
Securities held-to-maturity	300
Loans	687,923
OREO	2,276
Goodwill	59,649
Other intangible assets	3,068
Premises, furniture, and equipment	2,550
Accrued interest receivable and other assets	13,502
Total assets	1,150,905
Liabilities
Noninterest-bearing deposits	356,050
Interest-bearing deposits	594,026
Total deposits	950,076
Borrowed funds	11,532
Accrued interest payable and other liabilities	14,915
Total liabilities	976,523
Consideration Paid
Common stock (2020 – 4,930,231, shares issued at $14.58 per share)	71,883
Cash paid	102,499
Total consideration paid	$ 174,382
Common stock, shares issued (in shares) | shares	4,930,231
Shares issued (in dollars per share) | $ / shares	$ 14.58

Securities - Securities Portfol

Securities - Securities Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 3,225,285	$ 3,043,480
Gross Unrealized Gains	37,490	63,141
Gross Unrealized Losses	(49,867)	(10,213)
Fair Value	3,212,908	3,096,408
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	10,853	12,071
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(392)	(385)
Fair Value	10,461
Allowance for securities held-to-maturity	(220)	(220)
Securities held-to-maturity, at amortized cost, net	10,633	12,071
Fair value, net of allowance	10,241	11,686
Equity securities	114,848	76,404
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	0	12,001
Gross Unrealized Gains	0	50
Gross Unrealized Losses	0	0
Fair Value	0	12,051
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	675,866	654,321
Gross Unrealized Gains	1,434	3,129
Gross Unrealized Losses	(21,188)	(4,976)
Fair Value	656,112	652,474
Collateralized mortgage obligations ("CMOs")
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,304,762	1,415,312
Gross Unrealized Gains	11,633	27,529
Gross Unrealized Losses	(20,851)	(4,323)
Fair Value	1,295,544	1,438,518
Other mortgage-backed securities ("MBSs")
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	854,852	566,830
Gross Unrealized Gains	8,170	14,650
Gross Unrealized Losses	(6,926)	(640)
Fair Value	856,096	580,840
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	216,744	224,446
Gross Unrealized Gains	8,776	11,573
Gross Unrealized Losses	(902)	(4)
Fair Value	224,618	236,015
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	10,853	12,291
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(392)	(385)
Fair Value	10,461	11,906
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	173,061	170,570
Gross Unrealized Gains	7,477	6,210
Gross Unrealized Losses	0	(270)
Fair Value	$ 180,538	$ 176,510

Securities - Additional Informa

Securities - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Available-for-sale securities pledged	$ 2,100,000,000		$ 2,100,000,000		$ 1,600,000,000
Held-to-maturity securities pledged as collateral	0		0		0
Realized gains (losses) on securities available-for-sale	0	$ 14,328,000	0	$ 13,323,000
Securities Receivable
Financing Receivable, Nonaccrual [Line Items]
Accrued interest receivable	$ 10,400,000		$ 10,400,000		$ 11,900,000

Securities - Remaining Contract

Securities - Remaining Contractual Maturity of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Available-for-Sale, Amortized Cost
One year or less	$ 115,656
After one year to five years	157,219
After five years to ten years	792,796
After ten years	0
Securities that do not have a single contractual maturity date	2,159,614
Amortized Cost	3,225,285	$ 3,043,480
Available-for-Sale, Fair Value
One year or less	115,178
After one year to five years	156,570
After five years to ten years	789,520
After ten years	0
Securities that do not have a single contractual maturity date	2,151,640
Fair Value	3,212,908	3,096,408
Held-to-Maturity, Amortized Cost
One year or less	1,857
After one year to five years	4,495
After five years to ten years	1,953
After ten years	2,548
Securities that do not have a single contractual maturity date	0
Amortized Cost	10,853	$ 12,071
Held-to-Maturity, Fair Value
One year or less	1,790
After one year to five years	4,333
After five years to ten years	1,882
After ten years	2,456
Securities that do not have a single contractual maturity date	0
Fair Value	$ 10,461

Securities - Securities In An U

Securities - Securities In An Unrealized Loss Position (Details) $ in Thousands	Sep. 30, 2021USD ($)security	Dec. 31, 2020USD ($)security
Securities available-for-sale
Number of Securities | security	367	178
Available-for-Sale, Fair Value
Less Than 12 Months	$ 1,368,781	$ 682,644
12 Months or Longer	421,918	123,370
Total	1,790,699	806,014
Unrealized Losses
Less Than 12 Months	30,598	8,628
12 Months or Longer	19,269	1,585
Total	$ 49,867	$ 10,213
U.S. agency securities
Securities available-for-sale
Number of Securities | security	74	48
Available-for-Sale, Fair Value
Less Than 12 Months	$ 331,843	$ 253,841
12 Months or Longer	216,769	14,932
Total	548,612	268,773
Unrealized Losses
Less Than 12 Months	10,834	4,764
12 Months or Longer	10,354	212
Total	$ 21,188	$ 4,976
CMOs
Securities available-for-sale
Number of Securities | security	178	104
Available-for-Sale, Fair Value
Less Than 12 Months	$ 666,381	$ 349,853
12 Months or Longer	139,952	86,618
Total	806,333	436,471
Unrealized Losses
Less Than 12 Months	13,271	3,205
12 Months or Longer	7,580	1,118
Total	$ 20,851	$ 4,323
MBSs
Securities available-for-sale
Number of Securities | security	85	19
Available-for-Sale, Fair Value
Less Than 12 Months	$ 349,060	$ 69,838
12 Months or Longer	59,373	12,307
Total	408,433	82,145
Unrealized Losses
Less Than 12 Months	5,751	550
12 Months or Longer	1,175	90
Total	$ 6,926	$ 640
Municipal securities
Securities available-for-sale
Number of Securities | security	30	4
Available-for-Sale, Fair Value
Less Than 12 Months	$ 21,497	$ 1,012
12 Months or Longer	5,824	0
Total	27,321	1,012
Unrealized Losses
Less Than 12 Months	742	4
12 Months or Longer	160	0
Total	$ 902	$ 4
Corporate debt securities
Securities available-for-sale
Number of Securities | security		3
Available-for-Sale, Fair Value
Less Than 12 Months		$ 8,100
12 Months or Longer		9,513
Total		17,613
Unrealized Losses
Less Than 12 Months		105
12 Months or Longer		165
Total		$ 270

Loans - Loan Portfolio (Details

Loans - Loan Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 14,788,732	$ 14,751,232
Loans	14,788,732	14,751,232
Deferred loan fees included in total loans	8,688	9,696
Overdrawn demand deposits included in total loans	8,562	8,444
Interest receivable on loan portfolio	51,600	56,700
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	14,687,682	14,591,038
Commercial, industrial, agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5,054,617	4,942,292
Commercial, industrial, agricultural | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,705,458	4,578,254
Loans	4,705,458	4,578,254
Commercial, industrial, agricultural | Commercial and industrial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,687,711	4,530,546
Commercial, industrial, agricultural | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	349,159	364,038
Loans	349,159	364,038
Commercial, industrial, agricultural | Agricultural | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	344,374	359,373
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,852,692	4,829,168
Loans	4,852,692	4,829,168
Commercial real estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,796,517	4,750,898
Commercial real estate | Office, retail, and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,765,592	1,861,768
Loans	1,765,592	1,861,768
Commercial real estate | Office, retail, and industrial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,738,178	1,827,891
Commercial real estate | Multi- family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,082,941	872,813
Loans	1,082,941	872,813
Commercial real estate | Multi- family | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,077,754	867,815
Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	595,204	612,611
Loans	595,204	612,611
Commercial real estate | Construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	592,433	606,934
Commercial real estate | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,408,955	1,481,976
Loans	1,408,955	1,481,976
Commercial real estate | Other commercial real estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,388,152	1,448,258
Total corporate loans, excluding Paycheck Protection Program ("PPP") loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	9,907,309	9,771,460
Loans	9,907,309	9,771,460
Total corporate loans, excluding Paycheck Protection Program ("PPP") loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	9,828,602	9,640,817
PPP loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	384,100	785,563
Loans	384,100	785,563
PPP loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	384,100	785,563
Total corporate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	10,291,409	10,557,023
Loans	10,291,409	10,557,023
Total corporate loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	10,212,702	10,426,380
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,497,323	4,194,209
Loans	4,497,323	4,194,209
Consumer | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,474,980	4,164,658
Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	591,126	761,725
Loans	591,126	761,725
Consumer | Home equity | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	585,157	750,263
Consumer | 1-4 family mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,332,732	3,022,413
Loans	3,332,732	3,022,413
Consumer | 1-4 family mortgages | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,319,223	3,009,564
Consumer | Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	573,465	410,071
Loans	573,465	410,071
Consumer | Installment | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 570,600	$ 404,831

Loans - Loans Sales (Details)

Loans - Loans Sales (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gain (Loss) on Sale of Financing Receivable	$ 5,761	$ 6,861	$ 22,205	$ 14,091
Total	14,788,732		14,788,732		$ 14,751,232
Corporate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payments for loan purchases	66,843	13,888	370,521	196,501
Consumer Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payments for loan purchases	186,910	168,052	1,026,204	562,604
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,852,692		4,852,692		4,829,168
Corporate loan sales
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales	0	50	17,227	4,648
Less book value of loans sold	0	65	17,177	4,542
Gain (Loss) on Sale of Financing Receivable	0	(15)	50	106
Commercial and industrial | Corporate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payments for loan purchases	65,633	10,196	299,708	178,912
Office, retail, and industrial | Corporate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payments for loan purchases	1,198	0	8,636	0
Multi- family | Corporate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payments for loan purchases	7	0	26,136	0
Multi- family | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,082,941		1,082,941		872,813
Construction | Corporate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payments for loan purchases	5	3,692	1,041	7,589
Construction | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	595,204		595,204		$ 612,611
Other commercial real estate | Corporate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payments for loan purchases	0	0	35,000	10,000
Home equity | Consumer Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payments for loan purchases	0	0	0	144,967
1-4 family mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales	205,699	258,695	713,775	551,105
Less book value of loans sold	199,938	251,819	691,620	537,120
Gain (Loss) on Sale of Financing Receivable	5,761	6,876	22,155	13,985
1-4 family mortgages | Consumer Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payments for loan purchases	186,910	168,052	772,828	417,637
Installment | Consumer Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Payments for loan purchases	$ 0	$ 0	$ 253,376	$ 0

Acquired Loans - Schedule of Ac

Acquired Loans - Schedule of Acquired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Acquired Loans (Details) - Acquired Loans [Line Items]
PCD	$ 14,582,491	$ 14,512,215
Acquired loans
Acquired Loans (Details) - Acquired Loans [Line Items]
Non-PCD	787,636	1,198,818
Total	948,790	1,410,839
Receivables acquired with deteriorated credit quality | Acquired loans
Acquired Loans (Details) - Acquired Loans [Line Items]
PCD	$ 161,154	$ 212,021

Acquired Loans - Additional Inf

Acquired Loans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Outstanding balance of PCD loans	$ 206.2		$ 206.2		$ 247.3
Acquired and covered receivables
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Accretion on acquired loans	$ 6.2	$ 8	$ 19.4	$ 21.9

Past Due Loans, Allowance For_3

Past Due Loans, Allowance For Credit Losses, Non-Accrual Loans, and TDRS - Aging Analysis of Past Due Loans and Non-Performing Loans by Class (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total	$ 14,788,732	$ 14,751,232
Total Loans	14,788,732	14,751,232
Non- accrual	88,083	142,525
90 Days or More Past Due, Still Accruing Interest	1,293	4,395
Current
Financing Receivable, Past Due [Line Items]
Total	14,687,682	14,591,038
30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	40,955	47,721
90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total	60,095	112,473
Total Past Due
Financing Receivable, Past Due [Line Items]
Total	101,050	160,194
Commercial, industrial, agricultural
Financing Receivable, Past Due [Line Items]
Total	5,054,617	4,942,292
Commercial, industrial, agricultural | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	4,705,458	4,578,254
Total Loans	4,705,458	4,578,254
Non- accrual	14,616	42,965
90 Days or More Past Due, Still Accruing Interest	722	591
Commercial, industrial, agricultural | Agricultural
Financing Receivable, Past Due [Line Items]
Total	349,159	364,038
Total Loans	349,159	364,038
Non- accrual	6,682	10,719
90 Days or More Past Due, Still Accruing Interest	0	0
Commercial, industrial, agricultural | Current | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	4,687,711	4,530,546
Commercial, industrial, agricultural | Current | Agricultural
Financing Receivable, Past Due [Line Items]
Total	344,374	359,373
Commercial, industrial, agricultural | 30-89 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	6,475	9,254
Commercial, industrial, agricultural | 30-89 Days Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total	1,388	705
Commercial, industrial, agricultural | 90 Days or More Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	11,272	38,454
Commercial, industrial, agricultural | 90 Days or More Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total	3,397	3,960
Commercial, industrial, agricultural | Total Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	17,747	47,708
Commercial, industrial, agricultural | Total Past Due | Agricultural
Financing Receivable, Past Due [Line Items]
Total	4,785	4,665
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	4,852,692	4,829,168
Total Loans	4,852,692	4,829,168
Non- accrual	43,993	67,516
90 Days or More Past Due, Still Accruing Interest	32	1,756
Commercial real estate | Office, retail, and industrial
Financing Receivable, Past Due [Line Items]
Total	1,765,592	1,861,768
Total Loans	1,765,592	1,861,768
Non- accrual	20,632	34,224
90 Days or More Past Due, Still Accruing Interest	0	257
Commercial real estate | Multi- family
Financing Receivable, Past Due [Line Items]
Total	1,082,941	872,813
Total Loans	1,082,941	872,813
Non- accrual	3,450	2,488
90 Days or More Past Due, Still Accruing Interest	0	0
Commercial real estate | Construction
Financing Receivable, Past Due [Line Items]
Total	595,204	612,611
Total Loans	595,204	612,611
Non- accrual	1,851	4,980
90 Days or More Past Due, Still Accruing Interest	0	1,065
Commercial real estate | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total	1,408,955	1,481,976
Total Loans	1,408,955	1,481,976
Non- accrual	18,060	25,824
90 Days or More Past Due, Still Accruing Interest	32	434
Commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Total	4,796,517	4,750,898
Commercial real estate | Current | Office, retail, and industrial
Financing Receivable, Past Due [Line Items]
Total	1,738,178	1,827,891
Commercial real estate | Current | Multi- family
Financing Receivable, Past Due [Line Items]
Total	1,077,754	867,815
Commercial real estate | Current | Construction
Financing Receivable, Past Due [Line Items]
Total	592,433	606,934
Commercial real estate | Current | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total	1,388,152	1,448,258
Commercial real estate | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	24,670	22,640
Commercial real estate | 30-89 Days Past Due | Office, retail, and industrial
Financing Receivable, Past Due [Line Items]
Total	15,351	3,961
Commercial real estate | 30-89 Days Past Due | Multi- family
Financing Receivable, Past Due [Line Items]
Total	2,085	2,510
Commercial real estate | 30-89 Days Past Due | Construction
Financing Receivable, Past Due [Line Items]
Total	920	1,154
Commercial real estate | 30-89 Days Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total	6,314	15,015
Commercial real estate | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total	31,505	55,630
Commercial real estate | 90 Days or More Past Due | Office, retail, and industrial
Financing Receivable, Past Due [Line Items]
Total	12,063	29,916
Commercial real estate | 90 Days or More Past Due | Multi- family
Financing Receivable, Past Due [Line Items]
Total	3,102	2,488
Commercial real estate | 90 Days or More Past Due | Construction
Financing Receivable, Past Due [Line Items]
Total	1,851	4,523
Commercial real estate | 90 Days or More Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total	14,489	18,703
Commercial real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	56,175	78,270
Commercial real estate | Total Past Due | Office, retail, and industrial
Financing Receivable, Past Due [Line Items]
Total	27,414	33,877
Commercial real estate | Total Past Due | Multi- family
Financing Receivable, Past Due [Line Items]
Total	5,187	4,998
Commercial real estate | Total Past Due | Construction
Financing Receivable, Past Due [Line Items]
Total	2,771	5,677
Commercial real estate | Total Past Due | Other commercial real estate
Financing Receivable, Past Due [Line Items]
Total	20,803	33,718
Total corporate loans, excluding Paycheck Protection Program ("PPP") loans
Financing Receivable, Past Due [Line Items]
Total	9,907,309	9,771,460
Total Loans	9,907,309	9,771,460
Non- accrual	65,291	121,200
90 Days or More Past Due, Still Accruing Interest	754	2,347
Total corporate loans, excluding Paycheck Protection Program ("PPP") loans | Current
Financing Receivable, Past Due [Line Items]
Total	9,828,602	9,640,817
Total corporate loans, excluding Paycheck Protection Program ("PPP") loans | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	32,533	32,599
Total corporate loans, excluding Paycheck Protection Program ("PPP") loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total	46,174	98,044
Total corporate loans, excluding Paycheck Protection Program ("PPP") loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	78,707	130,643
PPP loans
Financing Receivable, Past Due [Line Items]
Total	384,100	785,563
Total Loans	384,100	785,563
Non- accrual	0	0
90 Days or More Past Due, Still Accruing Interest	0	0
PPP loans | Current
Financing Receivable, Past Due [Line Items]
Total	384,100	785,563
PPP loans | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
PPP loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
PPP loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Total corporate loans
Financing Receivable, Past Due [Line Items]
Total	10,291,409	10,557,023
Total Loans	10,291,409	10,557,023
Non- accrual	65,291	121,200
90 Days or More Past Due, Still Accruing Interest	754	2,347
Total corporate loans | Current
Financing Receivable, Past Due [Line Items]
Total	10,212,702	10,426,380
Total corporate loans | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	32,533	32,599
Total corporate loans | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total	46,174	98,044
Total corporate loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	78,707	130,643
Consumer
Financing Receivable, Past Due [Line Items]
Total	4,497,323	4,194,209
Total Loans	4,497,323	4,194,209
Non- accrual	22,792	21,325
90 Days or More Past Due, Still Accruing Interest	539	2,048
Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total	591,126	761,725
Total Loans	591,126	761,725
Non- accrual	10,006	10,795
90 Days or More Past Due, Still Accruing Interest	75	956
Consumer | 1-4 family mortgages
Financing Receivable, Past Due [Line Items]
Total	3,332,732	3,022,413
Total Loans	3,332,732	3,022,413
Non- accrual	12,786	10,530
90 Days or More Past Due, Still Accruing Interest	0	115
Consumer | Installment
Financing Receivable, Past Due [Line Items]
Total	573,465	410,071
Total Loans	573,465	410,071
Non- accrual	0	0
90 Days or More Past Due, Still Accruing Interest	464	977
Consumer | Current
Financing Receivable, Past Due [Line Items]
Total	4,474,980	4,164,658
Consumer | Current | Home equity
Financing Receivable, Past Due [Line Items]
Total	585,157	750,263
Consumer | Current | 1-4 family mortgages
Financing Receivable, Past Due [Line Items]
Total	3,319,223	3,009,564
Consumer | Current | Installment
Financing Receivable, Past Due [Line Items]
Total	570,600	404,831
Consumer | 30-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	8,422	15,122
Consumer | 30-89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total	2,043	5,563
Consumer | 30-89 Days Past Due | 1-4 family mortgages
Financing Receivable, Past Due [Line Items]
Total	3,978	5,296
Consumer | 30-89 Days Past Due | Installment
Financing Receivable, Past Due [Line Items]
Total	2,401	4,263
Consumer | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Total	13,921	14,429
Consumer | 90 Days or More Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total	3,926	5,899
Consumer | 90 Days or More Past Due | 1-4 family mortgages
Financing Receivable, Past Due [Line Items]
Total	9,531	7,553
Consumer | 90 Days or More Past Due | Installment
Financing Receivable, Past Due [Line Items]
Total	464	977
Consumer | Total Past Due
Financing Receivable, Past Due [Line Items]
Total	22,343	29,551
Consumer | Total Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total	5,969	11,462
Consumer | Total Past Due | 1-4 family mortgages
Financing Receivable, Past Due [Line Items]
Total	13,509	12,849
Consumer | Total Past Due | Installment
Financing Receivable, Past Due [Line Items]
Total	$ 2,865	$ 5,240

Past Due Loans, Allowance For_4

Past Due Loans, Allowance For Credit Losses, Non-Accrual Loans, and TDRS - Allowance for Credit Losses Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	$ 223,226	$ 247,677	$ 247,042	$ 109,222
Allowance established for acquired PCD loans		(1,188)		14,366
Charge-offs	(11,757)	(17,538)	(46,701)	(45,702)
Recoveries	3,397	1,795	7,827	4,922
Net charge-offs	(8,360)	(15,743)	(38,874)	(40,780)
Provision for loan losses and other	0	16,127	6,698	88,308
Ending balance	214,866	246,873	214,866	246,873
Allowance for Unfunded Commitments
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	8,625	7,625	8,025	1,200
Allowance established for acquired PCD loans		0		872
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net charge-offs	0	0	0	0
Provision for loan losses and other	0	200	600	200
Ending balance	8,625	7,825	8,625	7,825
Commercial, industrial, agricultural
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	116,396	123,977	119,954	62,830
Allowance established for acquired PCD loans		(1,188)		11,452
Charge-offs	(7,081)	(6,853)	(26,688)	(19,592)
Recoveries	2,116	1,118	4,887	3,097
Net charge-offs	(4,965)	(5,735)	(21,801)	(16,495)
Provision for loan losses and other	508	8,674	13,786	47,782
Ending balance	111,939	125,728	111,939	125,728
Commercial real estate
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance			60,770
Ending balance	44,988		44,988
Commercial real estate | Office, Retail, and Industrial
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	17,992	24,441	24,078	7,580
Allowance established for acquired PCD loans		0		2,003
Charge-offs	(673)	(1,344)	(9,048)	(4,774)
Recoveries	117	5	237	20
Net charge-offs	(556)	(1,339)	(8,811)	(4,754)
Provision for loan losses and other	272	1,636	2,441	8,223
Ending balance	17,708	24,738	17,708	24,738
Commercial real estate | Multi- family
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	3,459	5,311	5,709	2,950
Allowance established for acquired PCD loans		0		0
Charge-offs	(1)	0	(5)	(19)
Recoveries	0	0	7	5
Net charge-offs	(1)	0	2	(14)
Provision for loan losses and other	172	428	(2,081)	2,406
Ending balance	3,630	5,739	3,630	5,739
Commercial real estate | Construction
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	4,924	11,522	6,674	1,697
Allowance established for acquired PCD loans		0		0
Charge-offs	(1,153)	(4,889)	(1,371)	(7,495)
Recoveries	167	0	177	0
Net charge-offs	(986)	(4,889)	(1,194)	(7,495)
Provision for loan losses and other	(210)	99	(1,752)	2,230
Ending balance	3,728	6,732	3,728	6,732
Commercial real estate | Other Commercial Real Estate
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	20,058	21,862	24,309	6,408
Allowance established for acquired PCD loans		0		0
Charge-offs	(857)	(1,823)	(1,928)	(2,162)
Recoveries	28	70	269	226
Net charge-offs	(829)	(1,753)	(1,659)	(1,936)
Provision for loan losses and other	693	3,522	(2,728)	7,732
Ending balance	19,922	23,631	19,922	23,631
Consumer
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance			58,293
Ending balance	49,314		49,314
Consumer | Consumer
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance	51,772	52,939	58,293	26,557
Allowance established for acquired PCD loans		0		39
Charge-offs	(1,992)	(2,629)	(7,661)	(11,660)
Recoveries	969	602	2,250	1,574
Net charge-offs	(1,023)	(2,027)	(5,411)	(10,086)
Provision for loan losses and other	(1,435)	1,568	(3,568)	19,735
Ending balance	$ 49,314	$ 52,480	$ 49,314	52,480
Adjustment to apply recent accounting pronouncements
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance				75,757
Adjustment to apply recent accounting pronouncements | Allowance for Unfunded Commitments
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance				5,553
Adjustment to apply recent accounting pronouncements | Commercial, industrial, agricultural
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance				20,159
Adjustment to apply recent accounting pronouncements | Commercial real estate | Office, Retail, and Industrial
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance				11,686
Adjustment to apply recent accounting pronouncements | Commercial real estate | Multi- family
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance				397
Adjustment to apply recent accounting pronouncements | Commercial real estate | Construction
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance				10,300
Adjustment to apply recent accounting pronouncements | Commercial real estate | Other Commercial Real Estate
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance				11,427
Adjustment to apply recent accounting pronouncements | Consumer | Consumer
Allowance for Credit Losses by Portfolio Segment [Roll Forward]
Beginning balance				$ 16,235

Past Due Loans, Allowance For_5

Past Due Loans, Allowance For Credit Losses, Non-Accrual Loans, and TDRS - Loans and Related Allowance for Credit Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment	$ 42,396		$ 88,203
Loans, Collectively Evaluated for Impairment	14,585,182		14,451,008
Total	14,788,732		14,751,232
Allowance for Credit Losses Individually Evaluated for Impairment	2,047		4,830
Allowance for Credit Losses Collectively Evaluated for Impairment	193,856		211,085
Allowance for Credit Losses, PCD and Total	214,866	$ 223,226	247,042	$ 246,873	$ 247,677	$ 109,222
PCD
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	161,154		212,021
Allowance for Credit Losses, PCD and Total	18,963		31,127
Commercial, industrial, agricultural
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment	14,580		45,650
Loans, Collectively Evaluated for Impairment	4,993,501		4,826,017
Total	5,054,617		4,942,292
Allowance for Credit Losses Individually Evaluated for Impairment	1,499		3,536
Allowance for Credit Losses Collectively Evaluated for Impairment	105,470		107,763
Allowance for Credit Losses, PCD and Total	111,939	116,396	119,954	125,728	123,977	62,830
Commercial, industrial, agricultural | PCD
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	46,536		70,625
Allowance for Credit Losses, PCD and Total	4,970		8,655
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment	27,816		42,553
Loans, Collectively Evaluated for Impairment	4,729,614		4,667,386
Total	4,852,692		4,829,168
Allowance for Credit Losses Individually Evaluated for Impairment	548		1,294
Allowance for Credit Losses Collectively Evaluated for Impairment	30,946		37,730
Allowance for Credit Losses, PCD and Total	44,988		60,770
Commercial real estate | PCD
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	95,262		119,229
Allowance for Credit Losses, PCD and Total	13,494		21,746
Total corporate loans, excluding Paycheck Protection Program ("PPP") loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment	42,396		88,203
Loans, Collectively Evaluated for Impairment	9,723,115		9,493,403
Total	9,907,309		9,771,460
Allowance for Credit Losses Individually Evaluated for Impairment	2,047		4,830
Allowance for Credit Losses Collectively Evaluated for Impairment	136,416		145,493
Allowance for Credit Losses, PCD and Total	156,927		180,724
Total corporate loans, excluding Paycheck Protection Program ("PPP") loans | PCD
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	141,798		189,854
Allowance for Credit Losses, PCD and Total	18,464		30,401
PPP loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment	0		0
Loans, Collectively Evaluated for Impairment	384,100		785,563
Total	384,100		785,563
Allowance for Credit Losses Individually Evaluated for Impairment	0		0
Allowance for Credit Losses Collectively Evaluated for Impairment	0		0
Allowance for Credit Losses, PCD and Total	0		0
PPP loans | PCD
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	0		0
Allowance for Credit Losses, PCD and Total	0		0
Total corporate loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment	42,396		88,203
Loans, Collectively Evaluated for Impairment	10,107,215		10,278,966
Total	10,291,409		10,557,023
Allowance for Credit Losses Individually Evaluated for Impairment	2,047		4,830
Allowance for Credit Losses Collectively Evaluated for Impairment	136,416		145,493
Allowance for Credit Losses, PCD and Total	156,927		180,724
Total corporate loans | PCD
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	141,798		189,854
Allowance for Credit Losses, PCD and Total	18,464		30,401
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment	0		0
Loans, Collectively Evaluated for Impairment	4,477,967		4,172,042
Total	4,497,323		4,194,209
Allowance for Credit Losses Individually Evaluated for Impairment	0		0
Allowance for Credit Losses Collectively Evaluated for Impairment	48,815		57,567
Allowance for Credit Losses, PCD and Total	49,314		58,293
Consumer | PCD
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	19,356		22,167
Allowance for Credit Losses, PCD and Total	499		726
Office, retail, and industrial | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment	12,498		26,384
Loans, Collectively Evaluated for Impairment	1,719,005		1,792,618
Total	1,765,592		1,861,768
Allowance for Credit Losses Individually Evaluated for Impairment	384		1,123
Allowance for Credit Losses Collectively Evaluated for Impairment	13,902		15,106
Allowance for Credit Losses, PCD and Total	17,708	17,992	24,078	24,738	24,441	7,580
Office, retail, and industrial | Commercial real estate | PCD
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	34,089		42,766
Allowance for Credit Losses, PCD and Total	3,422		7,849
Multi- family | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment	2,171		1,279
Loans, Collectively Evaluated for Impairment	1,074,323		864,677
Total	1,082,941		872,813
Allowance for Credit Losses Individually Evaluated for Impairment	0		0
Allowance for Credit Losses Collectively Evaluated for Impairment	3,555		5,438
Allowance for Credit Losses, PCD and Total	3,630	3,459	5,709	5,739	5,311	2,950
Multi- family | Commercial real estate | PCD
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	6,447		6,857
Allowance for Credit Losses, PCD and Total	75		271
Construction | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment	1,154		1,154
Loans, Collectively Evaluated for Impairment	582,683		595,550
Total	595,204		612,611
Allowance for Credit Losses Individually Evaluated for Impairment	0		0
Allowance for Credit Losses Collectively Evaluated for Impairment	3,406		4,535
Allowance for Credit Losses, PCD and Total	3,728	4,924	6,674	6,732	11,522	1,697
Construction | Commercial real estate | PCD
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	11,367		15,907
Allowance for Credit Losses, PCD and Total	322		2,139
Other commercial real estate | Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment	11,993		13,736
Loans, Collectively Evaluated for Impairment	1,353,603		1,414,541
Total	1,408,955		1,481,976
Allowance for Credit Losses Individually Evaluated for Impairment	164		171
Allowance for Credit Losses Collectively Evaluated for Impairment	10,083		12,651
Allowance for Credit Losses, PCD and Total	19,922	20,058	24,309	23,631	21,862	6,408
Other commercial real estate | Commercial real estate | PCD
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	43,359		53,699
Allowance for Credit Losses, PCD and Total	9,675		11,487
Allowance for unfunded commitments
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, Individually Evaluated for Impairment	0		0
Loans, Collectively Evaluated for Impairment	0		0
Total	0		0
Allowance for Credit Losses Individually Evaluated for Impairment	0		0
Allowance for Credit Losses Collectively Evaluated for Impairment	8,625		8,025
Allowance for Credit Losses, PCD and Total	8,625	$ 8,625	8,025	$ 7,825	$ 7,625	$ 1,200
Allowance for unfunded commitments | PCD
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	0		0
Allowance for Credit Losses, PCD and Total	$ 0		$ 0

Past Due Loans, Allowance For_6

Past Due Loans, Allowance For Credit Losses, Non-Accrual Loans, and TDRS - Collateral-dependent Loans and Non-accrual Loans With No Related Allowance by Class (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	$ 88,083	$ 142,525
Non-accrual Loans With No Related Allowance	35,119	89,352
Real Estate
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	68,377	129,295
Blanket Lien
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	11,572	37,369
Equipment
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	923	2,555
Commercial, industrial, agricultural | Commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	14,616	42,965
Non-accrual Loans With No Related Allowance	10,619	36,686
Commercial, industrial, agricultural | Commercial and industrial | Real Estate
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	4,296	27,007
Commercial, industrial, agricultural | Commercial and industrial | Blanket Lien
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	11,572	35,632
Commercial, industrial, agricultural | Commercial and industrial | Equipment
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	923	2,555
Commercial, industrial, agricultural | Agricultural
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	6,682	10,719
Non-accrual Loans With No Related Allowance	2,784	5,213
Commercial, industrial, agricultural | Agricultural | Real Estate
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	6,445	8,583
Commercial, industrial, agricultural | Agricultural | Blanket Lien
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	1,737
Commercial, industrial, agricultural | Agricultural | Equipment
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	43,993	67,516
Non-accrual Loans With No Related Allowance	21,620	46,776
Commercial real estate | Real Estate
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	56,410	90,687
Commercial real estate | Blanket Lien
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Commercial real estate | Equipment
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Commercial real estate | Office, retail, and industrial
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	20,632	34,224
Non-accrual Loans With No Related Allowance	11,868	23,508
Commercial real estate | Office, retail, and industrial | Real Estate
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	20,285	42,790
Commercial real estate | Office, retail, and industrial | Blanket Lien
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Commercial real estate | Office, retail, and industrial | Equipment
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Commercial real estate | Multi- family
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	3,450	2,488
Non-accrual Loans With No Related Allowance	2,950	1,279
Commercial real estate | Multi- family | Real Estate
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	2,950	2,097
Commercial real estate | Multi- family | Blanket Lien
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Commercial real estate | Multi- family | Equipment
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Commercial real estate | Construction
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	1,851	4,980
Non-accrual Loans With No Related Allowance	327	1,831
Commercial real estate | Construction | Real Estate
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	2,223	5,370
Commercial real estate | Construction | Blanket Lien
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Commercial real estate | Construction | Equipment
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Commercial real estate | Other commercial real estate
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	18,060	25,824
Non-accrual Loans With No Related Allowance	6,475	20,158
Commercial real estate | Other commercial real estate | Real Estate
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	30,952	40,430
Commercial real estate | Other commercial real estate | Blanket Lien
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Commercial real estate | Other commercial real estate | Equipment
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Total corporate loans
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	65,291	121,200
Non-accrual Loans With No Related Allowance	35,023	88,675
Total corporate loans | Real Estate
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	67,151	126,277
Total corporate loans | Blanket Lien
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	11,572	37,369
Total corporate loans | Equipment
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	923	2,555
Consumer
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	22,792	21,325
Non-accrual Loans With No Related Allowance	96	677
Consumer | Real Estate
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	1,226	3,018
Consumer | Blanket Lien
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Consumer | Equipment
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Consumer | Home equity
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	10,006	10,795
Non-accrual Loans With No Related Allowance	96	99
Consumer | Home equity | Real Estate
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	96	211
Consumer | Home equity | Blanket Lien
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Consumer | Home equity | Equipment
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Consumer | 1-4 family mortgages
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	12,786	10,530
Non-accrual Loans With No Related Allowance	0	578
Consumer | 1-4 family mortgages | Real Estate
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	1,130	2,807
Consumer | 1-4 family mortgages | Blanket Lien
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Consumer | 1-4 family mortgages | Equipment
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Consumer | Installment
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Non-accrual Loans With No Related Allowance	0	0
Consumer | Installment | Real Estate
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Consumer | Installment | Blanket Lien
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	0	0
Consumer | Installment | Equipment
Financing Receivable, Nonaccrual [Line Items]
Non- accrual	$ 0	$ 0

Past Due Loans, Allowance For_7

Past Due Loans, Allowance For Credit Losses, Non-Accrual Loans, and TDRS - Impaired Loans Individually Evaluated by Class (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Allowance	$ 25,475		$ 25,475		$ 75,648
Recorded Investment in Loans with a Specific Allowance	16,921		16,921		12,555
Unpaid Principal Balance	64,296		64,296		102,527
Specific Allowance	2,047		2,047		4,830
Interest income on non-accrual loans	291	$ 1,000	864	$ 1,400
Commercial, industrial, agricultural | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Allowance	7,284		7,284		33,643
Recorded Investment in Loans with a Specific Allowance	850		850		1,687
Unpaid Principal Balance	22,314		22,314		40,055
Specific Allowance	294		294		398
Commercial, industrial, agricultural | Agricultural
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Allowance	2,784		2,784		5,213
Recorded Investment in Loans with a Specific Allowance	3,662		3,662		5,107
Unpaid Principal Balance	10,917		10,917		14,972
Specific Allowance	1,205		1,205		3,138
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Allowance	15,407		15,407		36,792
Recorded Investment in Loans with a Specific Allowance	12,409		12,409		5,761
Unpaid Principal Balance	31,065		31,065		47,500
Specific Allowance	548		548		1,294
Commercial real estate | Office, retail, and industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Allowance	10,643		10,643		21,537
Recorded Investment in Loans with a Specific Allowance	1,855		1,855		4,847
Unpaid Principal Balance	14,849		14,849		30,474
Specific Allowance	384		384		1,123
Commercial real estate | Multi- family
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Allowance	2,171		2,171		1,279
Recorded Investment in Loans with a Specific Allowance	0		0		0
Unpaid Principal Balance	2,171		2,171		1,279
Specific Allowance	0		0		0
Commercial real estate | Construction
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Allowance	0		0		1,154
Recorded Investment in Loans with a Specific Allowance	1,154		1,154		0
Unpaid Principal Balance	1,182		1,182		1,507
Specific Allowance	0		0		0
Commercial real estate | Other commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Allowance	2,593		2,593		12,822
Recorded Investment in Loans with a Specific Allowance	9,400		9,400		914
Unpaid Principal Balance	12,863		12,863		14,240
Specific Allowance	164		164		171
Total corporate loans
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Allowance	25,475		25,475		75,648
Recorded Investment in Loans with a Specific Allowance	16,921		16,921		12,555
Unpaid Principal Balance	64,296		64,296		102,527
Specific Allowance	2,047		2,047		4,830
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment in Loans with No Specific Allowance	0		0		0
Recorded Investment in Loans with a Specific Allowance	0		0		0
Unpaid Principal Balance	0		0		0
Specific Allowance	$ 0		$ 0		$ 0

Past Due Loans, Allowance For_8

Past Due Loans, Allowance For Credit Losses, Non-Accrual Loans, and TDRS - Corporate Loans Portfolio Segment By Origination Year (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Total loans
Total	$ 14,788,732		$ 14,788,732		$ 14,751,232
Consumer net loan charge-offs
Revolving loans converted to term loans	12,900	$ 5,200	34,000	$ 29,000
Corporate Loan | Commercial, industrial, agricultural
Total loans
2021	755,086		755,086
2020	645,792		645,792
2019	772,200		772,200
2018	692,598		692,598
2017	353,871		353,871
Prior	495,896		495,896
Revolving Loans	1,339,174		1,339,174
Total	5,054,617		5,054,617
Corporate Loan | Commercial, industrial, agricultural | Pass
Total loans
2021	752,464		752,464
2020	641,813		641,813
2019	723,079		723,079
2018	588,007		588,007
2017	308,785		308,785
Prior	430,650		430,650
Revolving Loans	1,280,272		1,280,272
Total	4,725,070		4,725,070
Corporate Loan | Commercial, industrial, agricultural | Special Mention
Total loans
2021	2,370		2,370
2020	894		894
2019	26,523		26,523
2018	37,174		37,174
2017	20,750		20,750
Prior	32,822		32,822
Revolving Loans	36,094		36,094
Total	156,627		156,627
Corporate Loan | Commercial, industrial, agricultural | Substandard
Total loans
2021	252		252
2020	2,039		2,039
2019	21,011		21,011
2018	64,985		64,985
2017	22,195		22,195
Prior	19,296		19,296
Revolving Loans	21,844		21,844
Total	151,622		151,622
Corporate Loan | Commercial, industrial, agricultural | Non-accrual
Total loans
2021	0		0
2020	1,046		1,046
2019	1,587		1,587
2018	2,432		2,432
2017	2,141		2,141
Prior	13,128		13,128
Revolving Loans	964		964
Total	21,298		21,298
Corporate Loan | Commercial, industrial, agricultural | Net loan charge-offs
Total loans
2021	0		0
2020	835		835
2019	4,738		4,738
2018	4,745		4,745
2017	9,770		9,770
Prior	(873)		(873)
Revolving Loans	2,586		2,586
Total	21,801		21,801
Corporate Loan | Office, retail, and industrial
Total loans
2021	141,901		141,901
2020	139,210		139,210
2019	209,725		209,725
2018	177,117		177,117
2017	261,082		261,082
Prior	822,078		822,078
Revolving Loans	14,479		14,479
Total	1,765,592		1,765,592
Corporate Loan | Office, retail, and industrial | Pass
Total loans
2021	139,452		139,452
2020	138,270		138,270
2019	205,148		205,148
2018	157,894		157,894
2017	238,194		238,194
Prior	727,319		727,319
Revolving Loans	14,479		14,479
Total	1,620,756		1,620,756
Corporate Loan | Office, retail, and industrial | Special Mention
Total loans
2021	1,717		1,717
2020	312		312
2019	4,577		4,577
2018	3,301		3,301
2017	17,234		17,234
Prior	35,009		35,009
Revolving Loans	0		0
Total	62,150		62,150
Corporate Loan | Office, retail, and industrial | Substandard
Total loans
2021	732		732
2020	628		628
2019	0		0
2018	15,922		15,922
2017	5,330		5,330
Prior	39,442		39,442
Revolving Loans	0		0
Total	62,054		62,054
Corporate Loan | Office, retail, and industrial | Non-accrual
Total loans
2021	0		0
2020	0		0
2019	0		0
2018	0		0
2017	324		324
Prior	20,308		20,308
Revolving Loans	0		0
Total	20,632		20,632
Corporate Loan | Office, retail, and industrial | Net loan charge-offs
Total loans
2021	0		0
2020	0		0
2019	246		246
2018	3,899		3,899
2017	1,023		1,023
Prior	3,643		3,643
Revolving Loans	0		0
Total	8,811		8,811
Corporate Loan | Multi- family
Total loans
2021	220,347		220,347
2020	154,304		154,304
2019	159,113		159,113
2018	84,970		84,970
2017	118,355		118,355
Prior	327,615		327,615
Revolving Loans	18,237		18,237
Total	1,082,941		1,082,941
Corporate Loan | Multi- family | Pass
Total loans
2021	220,347		220,347
2020	154,304		154,304
2019	153,338		153,338
2018	80,207		80,207
2017	117,350		117,350
Prior	277,778		277,778
Revolving Loans	18,237		18,237
Total	1,021,561		1,021,561
Corporate Loan | Multi- family | Special Mention
Total loans
2021	0		0
2020	0		0
2019	5,775		5,775
2018	4,385		4,385
2017	0		0
Prior	31,356		31,356
Revolving Loans	0		0
Total	41,516		41,516
Corporate Loan | Multi- family | Substandard
Total loans
2021	0		0
2020	0		0
2019	0		0
2018	378		378
2017	70		70
Prior	15,966		15,966
Revolving Loans	0		0
Total	16,414		16,414
Corporate Loan | Multi- family | Non-accrual
Total loans
2021	0		0
2020	0		0
2019	0		0
2018	0		0
2017	935		935
Prior	2,515		2,515
Revolving Loans	0		0
Total	3,450		3,450
Corporate Loan | Multi- family | Net loan charge-offs
Total loans
2021	0		0
2020	0		0
2019	0		0
2018	0		0
2017	5		5
Prior	(7)		(7)
Revolving Loans	0		0
Total	(2)		(2)
Corporate Loan | Construction
Total loans
2021	62,941		62,941
2020	135,694		135,694
2019	89,579		89,579
2018	133,870		133,870
2017	65,492		65,492
Prior	82,658		82,658
Revolving Loans	24,970		24,970
Total	595,204		595,204
Corporate Loan | Construction | Pass
Total loans
2021	62,941		62,941
2020	135,694		135,694
2019	89,579		89,579
2018	133,832		133,832
2017	62,946		62,946
Prior	73,511		73,511
Revolving Loans	24,970		24,970
Total	583,473		583,473
Corporate Loan | Construction | Special Mention
Total loans
2021	0		0
2020	0		0
2019	0		0
2018	38		38
2017	0		0
Prior	162		162
Revolving Loans	0		0
Total	200		200
Corporate Loan | Construction | Substandard
Total loans
2021	0		0
2020	0		0
2019	0		0
2018	0		0
2017	1,392		1,392
Prior	8,288		8,288
Revolving Loans	0		0
Total	9,680		9,680
Corporate Loan | Construction | Non-accrual
Total loans
2021	0		0
2020	0		0
2019	0		0
2018	0		0
2017	1,154		1,154
Prior	697		697
Revolving Loans	0		0
Total	1,851		1,851
Corporate Loan | Construction | Net loan charge-offs
Total loans
2021	0		0
2020	0		0
2019	0		0
2018	0		0
2017	1,104		1,104
Prior	49		49
Revolving Loans	41		41
Total	1,194		1,194
Corporate Loan | Other commercial real estate
Total loans
2021	180,456		180,456
2020	167,456		167,456
2019	183,355		183,355
2018	250,009		250,009
2017	170,997		170,997
Prior	433,139		433,139
Revolving Loans	23,543		23,543
Total	1,408,955		1,408,955
Corporate Loan | Other commercial real estate | Pass
Total loans
2021	180,456		180,456
2020	167,456		167,456
2019	157,047		157,047
2018	206,984		206,984
2017	138,750		138,750
Prior	335,895		335,895
Revolving Loans	23,160		23,160
Total	1,209,748		1,209,748
Corporate Loan | Other commercial real estate | Special Mention
Total loans
2021	0		0
2020	0		0
2019	24,396		24,396
2018	12,462		12,462
2017	10,464		10,464
Prior	22,403		22,403
Revolving Loans	0		0
Total	69,725		69,725
Corporate Loan | Other commercial real estate | Substandard
Total loans
2021	0		0
2020	0		0
2019	1,912		1,912
2018	30,358		30,358
2017	20,727		20,727
Prior	58,183		58,183
Revolving Loans	242		242
Total	111,422		111,422
Corporate Loan | Other commercial real estate | Non-accrual
Total loans
2021	0		0
2020	0		0
2019	0		0
2018	205		205
2017	1,056		1,056
Prior	16,658		16,658
Revolving Loans	141		141
Total	18,060		18,060
Corporate Loan | Other commercial real estate | Net loan charge-offs
Total loans
2021	0		0
2020	0		0
2019	0		0
2018	245		245
2017	11		11
Prior	1,403		1,403
Revolving Loans	0		0
Total	1,659		1,659
Consumer
Total loans
Total	4,497,323		4,497,323		4,194,209
Consumer | Home equity
Total loans
2021	7,471		7,471
2020	10,778		10,778
2019	8,230		8,230
2018	10,103		10,103
2017	8,731		8,731
Prior	55,458		55,458
Revolving Loans	490,355		490,355
Total	591,126		591,126		761,725
Consumer net loan charge-offs
2021	0		0
2020	0		0
2019	0		0
2018	27		27
2017	(42)		(42)
Prior	(347)		(347)
Revolving Loans	(26)		(26)
Total	(388)		(388)
Consumer | Home equity | Performing
Total loans
2021	7,471		7,471
2020	10,778		10,778
2019	8,168		8,168
2018	9,650		9,650
2017	8,508		8,508
Prior	48,409		48,409
Revolving Loans	488,136		488,136
Total	581,120		581,120
Consumer | Home equity | Non-accrual
Total loans
2021	0		0
2020	0		0
2019	62		62
2018	453		453
2017	223		223
Prior	7,049		7,049
Revolving Loans	2,219		2,219
Total	10,006		10,006
Consumer | 1-4 family mortgages
Total loans
2021	908,935		908,935
2020	1,580,084		1,580,084
2019	379,610		379,610
2018	119,463		119,463
2017	74,912		74,912
Prior	269,108		269,108
Revolving Loans	620		620
Total	3,332,732		3,332,732
Consumer net loan charge-offs
2021	0		0
2020	0		0
2019	0		0
2018	2		2
2017	0		0
Prior	247		247
Revolving Loans	0		0
Total	249		249
Consumer | 1-4 family mortgages | Performing
Total loans
2021	908,935		908,935
2020	1,579,102		1,579,102
2019	379,230		379,230
2018	118,836		118,836
2017	74,276		74,276
Prior	258,947		258,947
Revolving Loans	620		620
Total	3,319,946		3,319,946
Consumer | 1-4 family mortgages | Non-accrual
Total loans
2021	0		0
2020	982		982
2019	380		380
2018	627		627
2017	636		636
Prior	10,161		10,161
Revolving Loans	0		0
Total	12,786		12,786
Consumer | Installment
Total loans
2021	165,389		165,389
2020	132,025		132,025
2019	108,820		108,820
2018	74,939		74,939
2017	31,654		31,654
Prior	18,255		18,255
Revolving Loans	42,383		42,383
Total	573,465		573,465		$ 410,071
Consumer net loan charge-offs
2021	247		247
2020	1,323		1,323
2019	2,590		2,590
2018	1,439		1,439
2017	97		97
Prior	(182)		(182)
Revolving Loans	36		36
Total	5,550		5,550
Consumer | Installment | Performing
Total loans
2021	165,389		165,389
2020	132,025		132,025
2019	108,820		108,820
2018	74,939		74,939
2017	31,654		31,654
Prior	18,255		18,255
Revolving Loans	42,383		42,383
Total	573,465		573,465
Consumer | Installment | Non-accrual
Total loans
2021	0		0
2020	0		0
2019	0		0
2018	0		0
2017	0		0
Prior	0		0
Revolving Loans	0		0
Total	$ 0		$ 0

Past Due Loans, Allowance For_9

Past Due Loans, Allowance For Credit Losses, Non-Accrual Loans, and TDRS - TDRs By Class (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing	$ 539	$ 813
Non-accrual	6,726	11,703
Total	7,265	12,516	$ 16,678
Eligible modifications, outstanding balance	40,600
Specific reserves related to TDRs	245	140
Commercial, industrial, agricultural | Commercial and industrial
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing	0	0
Non-accrual	6,255	8,859
Total	6,255	8,859
Commercial, industrial, agricultural | Agricultural
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing	0	0
Non-accrual	0	0
Total	0	0
Commercial real estate
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing	155	184
Non-accrual	151	2,500
Total	306	2,684
Commercial real estate | Office, retail, and industrial
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing	0	0
Non-accrual	0	2,340
Total	0	2,340
Commercial real estate | Multi- family
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing	0	0
Non-accrual	151	160
Total	151	160
Commercial real estate | Construction
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing	0	0
Non-accrual	0	0
Total	0	0
Commercial real estate | Other commercial real estate
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing	155	184
Non-accrual	0	0
Total	155	184
Total corporate loans
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing	155	184
Non-accrual	6,406	11,359
Total	6,561	11,543
Consumer
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing	384	629
Non-accrual	320	344
Total	704	973
Consumer | Home equity
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing	29	31
Non-accrual	103	116
Total	132	147
Consumer | 1-4 family mortgages
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing	355	598
Non-accrual	217	228
Total	572	826
Consumer | Installment
Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Details) - TDRs By Class [Line Items]
Accruing	0	0
Non-accrual	0	0
Total	$ 0	$ 0

Past Due Loans, Allowance Fo_10

Past Due Loans, Allowance For Credit Losses, Non-Accrual Loans, and TDRS - TDR Rollforward (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Troubled Debt Restructuring Activity Rollforward [Roll Forward]
Beginning balance			$ 12,516,000
Ending balance	$ 7,265,000	$ 16,678,000	7,265,000	$ 16,678,000
Material commitments to lend additional funds to borrowers with TDRs	0		0		$ 0
Accruing
Troubled Debt Restructuring Activity Rollforward [Roll Forward]
Beginning balance	782,000	1,201,000	813,000	1,233,000
Additions	0	0	0	0
Net payments	(243,000)	(13,000)	(274,000)	(45,000)
Net transfers to non-accrual	0	(347,000)	0	(347,000)
Ending balance	539,000	841,000	539,000	841,000
Non-accrual
Troubled Debt Restructuring Activity Rollforward [Roll Forward]
Beginning balance	7,403,000	12,093,000	11,703,000	20,514,000
Additions	0	11,636,000	0	11,636,000
Net payments	(677,000)	(5,886,000)	(3,951,000)	(8,205,000)
Charge-offs	0	(2,353,000)	(1,026,000)	(8,455,000)
Net transfers from accruing	0	347,000	0	347,000
Ending balance	$ 6,726,000	$ 15,837,000	$ 6,726,000	$ 15,837,000

Lease Obligations - Narrative (

Lease Obligations - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)branch
Leases [Abstract]
Operating lease, weighted average remaining lease term	9 years 2 months 12 days		9 years 2 months 12 days
Operating lease, weighted average discount rate (as a percent)	2.71%		2.71%
Operating lease, right-of-use asset	$ 140,200		$ 140,200
Operating lease, right-of-use asset, statement of financial position	Accrued interest receivable and other assets		Accrued interest receivable and other assets
Retail branch network | branch					17
Retail branch network percent					15.00%
Optimization costs	$ 0	$ 18,376	$ 1,556	$ 18,376	$ 19,900
Right-of-use asset					9,100
Impairment charge					$ 8,900

Lease Obligations - Schedule of

Lease Obligations - Schedule of Lease Liability (Details) $ in Thousands	Sep. 30, 2021USD ($)
Leases [Abstract]
2021	$ 5,670
2022	22,517
2023	22,624
2024	22,502
2025	21,317
2026 and thereafter	96,149
Total minimum lease payments	190,779
Discount	(23,349)
Lease liability	$ 167,430
Operating lease, liability, statement of financial position	Accrued interest payable and other liabilities

Lease Obligations - Schedule _2

Lease Obligations - Schedule of Net Operating Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Lease expense charged to operations	$ 4,558	$ 4,739	$ 13,610	$ 14,253
Rental income from premises leased to others	(71)	(158)	(293)	(556)
Net operating lease expense	$ 4,487	$ 4,581	$ 13,317	$ 13,697

Borrowed Funds - Summary of Bor

Borrowed Funds - Summary of Borrowed Funds (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Securities sold under agreements to repurchase	$ 124,044	$ 141,886
FHLB advances	1,150,528	1,404,528
Total borrowed funds	$ 1,274,572	$ 1,546,414

Borrowed Funds - Narrative (Det

Borrowed Funds - Narrative (Details) - USD ($)	Sep. 30, 2021	Sep. 27, 2016
Short-term Debt [Line Items]
Line of credit maximum borrowing capacity		$ 50,000,000
Federal Home Loan Bank Advances | Minimum
Short-term Debt [Line Items]
FHLB fixed interest rate (as a percent)	0.00%
Federal Home Loan Bank Advances | Maximum
Short-term Debt [Line Items]
FHLB fixed interest rate (as a percent)	1.97%

Borrowed Funds - Short-Term Cre

Borrowed Funds - Short-Term Credit Lines Available for Use (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
FRB's Discount Window Primary Credit Program
Line of Credit Facility [Line Items]
Credit lines available for use	$ 857,758	$ 864,867
Available federal funds lines
Line of Credit Facility [Line Items]
Credit lines available for use	982,000	844,000
Correspondent bank line of credit
Line of Credit Facility [Line Items]
Credit lines available for use	$ 0	$ 50,000

Material Transactions Affecti_2

Material Transactions Affecting Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 09, 2020	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Feb. 26, 2020	Feb. 25, 2020
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)			231,000		231,000
Preferred stock issued		$ (265)		$ 221,047
Net proceeds from the issuance of preferred stock		$ 221,200	$ 0	$ 221,047
Stock repurchase program, authorized amount						$ 200,000	$ 180,000
Common stock repurchased (in shares)			715,000
Total cost of common stock repurchased			$ 14,900
Depository Series A Shares
Class of Stock [Line Items]
Preferred stock, conversion rate (as a percent)		2.50%
Preferred stock, shares issued (in shares)		4,300,000		4,300,000
Preferred stock, fixed rate (as a percent)		7.00%
Depository Series C Shares
Class of Stock [Line Items]
Preferred stock, conversion rate (as a percent)		2.50%
Preferred stock, shares issued (in shares)		4,900,000		4,900,000
Preferred stock, fixed rate (as a percent)		7.00%
Depository Shares
Class of Stock [Line Items]
Preferred stock issued		$ 230,500
Bankmanagers Corporation
Class of Stock [Line Items]
Acquisitions, net of issuance costs (in shares)	4,930,231
Shares issued (in dollars per share)	$ 14.58

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 54,863	$ 27,623	$ 151,007	$ 66,293
Preferred dividends	(4,033)	(4,033)	(12,101)	(5,070)
Net income applicable to unvested restricted shares	(517)	(236)	(1,524)	(615)
Net income applicable to common shareholders	50,313	23,354	137,382	60,608
Net income applicable to common shares	$ 50,313	$ 23,354	$ 137,382	$ 60,608
Weighted-average common shares outstanding:
Weighted-average common shares outstanding (basic) (in Shares)	112,898	113,160	112,953	112,079
Dilutive effect of common stock equivalents (in Shares)	878	276	789	322
Weighted-average diluted common shares outstanding (in Shares)	113,776	113,436	113,742	112,401
Basic EPS (in dollars per share)	$ 0.45	$ 0.21	$ 1.22	$ 0.54
Diluted EPS (in dollars per share)	$ 0.44	$ 0.21	$ 1.21	$ 0.54

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivative [Line Items]
Amount hedged of borrowed funds using forward starting interest rate swaps	$ 25,000		$ 25,000
Amount to be hedged of borrowed funds using forward starting interest rate swaps	$ 25,000		$ 25,000
Weighted-average interest rate to be paid (as a percent)	0.60%		0.60%
Interest rate cash flow hedge loss to be reclassified during next 12 months, net	$ 5,800		$ 5,800
Capital market products income	$ 1,333	$ 886	$ 5,376	$ 6,302
Portion of fair value of outstanding interest rate swaps covered by collateral agreements (percent)	100.00%		100.00%		100.00%
Cash Flow Hedging
Derivative [Line Items]
Amount of variable rate loans hedged using interest rate swaps	$ 430,000		$ 430,000

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Cash Flow Hedges (Details) - Cash Flow Hedging - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross notional amount outstanding	$ 455,000,000	$ 455,000,000
Derivative asset fair value in other assets	460,000	3,707,000
Derivative liability fair value in other liabilities	$ 0	$ (1,000)
Weighted-average interest rate received	2.18%	2.18%
Weighted-average interest rate paid	0.08%	0.15%
Weighted-average maturity (in years)	9 months	1 year 6 months

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Other Derivative Instruments (Details) - Other Derivative Instruments - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Gross notional amount outstanding	$ 4,564,808	$ 4,491,398
Derivative asset fair value in other assets	90,710	149,997
Derivative liability fair value in other liabilities	(30,729)	(44,580)
Fair value of derivative	$ 32,262	$ 46,018

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Cash Flow Hedge Accounting on AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
(Losses) gains recognized in other comprehensive income	$ (2,091)	$ 28,614	$ (6,173)	$ 11,274
Reclassification of gains (losses) included in net income	0	14,285	0	14,285
Interest rate swaps in interest income | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
(Losses) gains recognized in other comprehensive income	(119)	96	235	28,051
Reclassification of gains (losses) included in net income	2,238	2,165	6,668	5,234
Interest rate swaps in interest expense | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
(Losses) gains recognized in other comprehensive income	(28)	(239)	(730)	(13,924)
Reclassification of gains (losses) included in net income	$ 0	$ (16,350)	$ 0	$ (16,350)

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities - Effect Of Derivatives On Interest Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total cash flow hedges	$ 0	$ (14,285)	$ 0	$ (14,285)
Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total cash flow hedges	2,238	(14,185)	6,668	(11,116)
Interest rate swaps in interest income | Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total cash flow hedges	2,238	2,165	6,668	5,234
Interest rate swaps in interest expense | Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Total cash flow hedges	$ 0	$ (16,350)	$ 0	$ (16,350)

Derivative Instruments and He_8

Derivative Instruments and Hedging Activities - Offsetting Derivatives (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Gross amounts recognized	$ 91,170	$ 153,704
Less: amounts offset in the Consolidated Statements of Financial Condition	0	0
Net amount presented in the Consolidated Statements of Financial Condition	91,170	153,704
Offsetting derivative positions	(2,285)	(5,239)
Cash collateral pledged	0	0
Net credit exposure	88,885	148,465
Liabilities
Gross amounts recognized	30,729	44,581
Less: amounts offset in the Consolidated Statements of Financial Condition	0	0
Net amount presented in the Consolidated Statements of Financial Condition	30,729	44,581
Offsetting derivative positions	(2,285)	(5,239)
Cash collateral pledged	(26,470)	(39,970)
Net credit exposure	$ 1,974	$ (628)

Commitments, Guarantees, and _3

Commitments, Guarantees, and Contingent Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other Commitments [Line Items]
Letters of credit	$ 114,797	$ 115,130
Commitments to extend credit
Other Commitments [Line Items]
Commercial, industrial, and agricultural	2,313,362	2,318,346
Commercial real estate	515,624	378,282
Home equity	608,440	611,640
Other commitments	273,734	264,869
Total commitments to extend credit	$ 3,711,160	$ 3,573,137

Fair Value - Recurring Fair Val

Fair Value - Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Assets
Equity securities	$ 114,848		$ 76,404
Securities available-for-sale
Securities available-for-sale, at fair value	3,212,908		3,096,408
Mortgage servicing rights (MSRs)	6,306	$ 6,269	4,899	$ 4,458	$ 4,464	$ 5,858
U.S. treasury securities
Securities available-for-sale
Securities available-for-sale, at fair value	0		12,051
U.S. agency securities
Securities available-for-sale
Securities available-for-sale, at fair value	656,112		652,474
CMOs
Securities available-for-sale
Securities available-for-sale, at fair value	1,295,544		1,438,518
MBSs
Securities available-for-sale
Securities available-for-sale, at fair value	856,096		580,840
Municipal securities
Securities available-for-sale
Securities available-for-sale, at fair value	224,618		236,015
Corporate debt securities
Securities available-for-sale
Securities available-for-sale, at fair value	180,538		176,510
Recurring | Level 1
Assets
Equity securities	87,232		52,888
Securities available-for-sale
Securities available-for-sale, at fair value	0		12,051
Mortgage servicing rights (MSRs)	0		0
Derivative assets	0		0
Liabilities
Derivative liabilities	0		0
Recurring | Level 1 | U.S. treasury securities
Securities available-for-sale
Securities available-for-sale, at fair value	0		12,051
Recurring | Level 1 | U.S. agency securities
Securities available-for-sale
Securities available-for-sale, at fair value	0		0
Recurring | Level 1 | CMOs
Securities available-for-sale
Securities available-for-sale, at fair value	0		0
Recurring | Level 1 | MBSs
Securities available-for-sale
Securities available-for-sale, at fair value	0		0
Recurring | Level 1 | Municipal securities
Securities available-for-sale
Securities available-for-sale, at fair value	0		0
Recurring | Level 1 | Corporate debt securities
Securities available-for-sale
Securities available-for-sale, at fair value	0		0
Recurring | Level 2
Assets
Equity securities	22,616		18,516
Securities available-for-sale
Securities available-for-sale, at fair value	3,212,908		3,084,357
Mortgage servicing rights (MSRs)	0		0
Derivative assets	91,170		153,704
Liabilities
Derivative liabilities	30,729		44,581
Recurring | Level 2 | U.S. treasury securities
Securities available-for-sale
Securities available-for-sale, at fair value	0		0
Recurring | Level 2 | U.S. agency securities
Securities available-for-sale
Securities available-for-sale, at fair value	656,112		652,474
Recurring | Level 2 | CMOs
Securities available-for-sale
Securities available-for-sale, at fair value	1,295,544		1,438,518
Recurring | Level 2 | MBSs
Securities available-for-sale
Securities available-for-sale, at fair value	856,096		580,840
Recurring | Level 2 | Municipal securities
Securities available-for-sale
Securities available-for-sale, at fair value	224,618		236,015
Recurring | Level 2 | Corporate debt securities
Securities available-for-sale
Securities available-for-sale, at fair value	180,538		176,510
Recurring | Level 3
Assets
Equity securities	0		0
Securities available-for-sale
Securities available-for-sale, at fair value	0		0
Mortgage servicing rights (MSRs)	6,306		4,899
Derivative assets	0		0
Liabilities
Derivative liabilities	0		0
Recurring | Level 3 | U.S. treasury securities
Securities available-for-sale
Securities available-for-sale, at fair value	0		0
Recurring | Level 3 | U.S. agency securities
Securities available-for-sale
Securities available-for-sale, at fair value	0		0
Recurring | Level 3 | CMOs
Securities available-for-sale
Securities available-for-sale, at fair value	0		0
Recurring | Level 3 | MBSs
Securities available-for-sale
Securities available-for-sale, at fair value	0		0
Recurring | Level 3 | Municipal securities
Securities available-for-sale
Securities available-for-sale, at fair value	0		0
Recurring | Level 3 | Corporate debt securities
Securities available-for-sale
Securities available-for-sale, at fair value	$ 0		$ 0

Fair Value - Narrative (Details

Fair Value - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	$ 114,848	$ 76,404
Total amount of loans being serviced for the benefit of others at the end of the period	$ 808,600	766,100
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Appraisal adjustment (percent)	0.00%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Appraisal adjustment (percent)	15.00%
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	$ 22,616	$ 18,516
Community Development Investments | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities, at fair value	$ 5,000

Fair Value - Significant Unobse

Fair Value - Significant Unobservable Inputs Used In the Valuation of MSRs (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Minimum
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Prepayment speed	2.40%	5.30%
Maturity (months)	14 months	13 months
Discount rate	9.50%	9.50%
Maximum
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Prepayment speed	15.40%	16.30%
Maturity (months)	82 months	71 months
Discount rate	15.00%	12.00%

Fair Value - Carrying Value of

Fair Value - Carrying Value of Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 6,269	$ 4,464	$ 4,899	$ 5,858
New MSRs	267	727	1,834	1,628
Total gains (losses) included in earnings:
Changes in valuation inputs and assumptions	137	(432)	603	(2,090)
Other changes in fair value	(367)	(301)	(1,030)	(938)
Ending balance	6,306	4,458	6,306	4,458
Contractually servicing fees earned	$ 512	$ 424	$ 1,472	$ 1,221

Fair Value - Assets Measured At

Fair Value - Assets Measured At Fair Value On A Non-Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO	$ 5,106	$ 8,253
Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	0	0
OREO	0	0
Loans held-for-sale	0	0
Assets held-for-sale	0	0
Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	0	0
OREO	0	0
Loans held-for-sale	0	0
Assets held-for-sale	0	0
Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	25,198	21,246
OREO	2,000	0
Loans held-for-sale	15,725	44,965
Assets held-for-sale	$ 3,438	$ 3,722

Fair Value - Fair Value Measure

Fair Value - Fair Value Measurements of Other Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 270,020	$ 196,364
Interest-bearing deposits in other banks	1,654,917	920,880
Securities held-to-maturity	10,853	12,071
FHLB and FRB stock	106,090	117,420
Loans	14,582,491	14,512,215
Investment in BOLI	300,387	301,101
Liabilities
Deposits	17,198,402	16,012,464
Borrowed funds	1,274,572	1,546,414
Senior and subordinated debt	235,383	234,768
Carrying Amount | Level 1
Assets
Cash and due from banks	270,020	196,364
Carrying Amount | Level 2
Assets
Interest-bearing deposits in other banks	1,654,917	920,880
Securities held-to-maturity	10,853	12,071
FHLB and FRB stock	106,090	117,420
Liabilities
Deposits	17,198,402	16,012,464
Borrowed funds	1,274,572	1,546,414
Senior and subordinated debt	235,383	234,768
Accrued interest payable	2,915	4,826
Carrying Amount | Level 3
Assets
Loans	14,582,491	14,512,215
Investment in BOLI	300,387	301,101
Accrued interest receivable	62,018	68,390
Fair Value | Level 1
Assets
Cash and due from banks	270,020	196,364
Fair Value | Level 2
Assets
Interest-bearing deposits in other banks	1,654,917	920,880
Securities held-to-maturity	10,461	11,686
FHLB and FRB stock	106,090	117,420
Liabilities
Deposits	17,199,593	16,007,133
Borrowed funds	1,274,572	1,546,414
Senior and subordinated debt	283,439	281,843
Accrued interest payable	2,915	4,826
Fair Value | Level 3
Assets
Loans	14,425,048	14,614,029
Investment in BOLI	300,387	301,101
Accrued interest receivable	$ 62,018	$ 68,390

Uncategorized Items - fmbi-2021

Label	Element	Value
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]