Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest and Dividend Income
Loan receivable	$ 649,224	$ 677,193	$ 729,619
Investment securities	14,151	20,599	33,037
Federal Home Loan Bank stock	991	952	1,207
Deposits with banks	2,145	1,830	5,404
Total interest and dividend income	666,511	700,574	769,267
Interest Expense
Time deposits	40,542	111,629	152,791
Other deposits	21,259	25,396	25,311
Advances from the Federal Home Loan Bank	1,182	5,299	7,441
Long-term debt	5,773	5,791	7,847
Deferred payments from acquisition	0	115	568
Short-term borrowings	0	234	403
Total interest expense	68,756	148,464	194,361
Net interest income before provision/(reversal) for credit losses	597,755	552,110	574,906
Provision/(reversal) for credit losses	16,008	(57,500)	7,000
Net interest income after provision/(reversal) for credit losses	613,763	494,610	581,906
Non-Interest Income
Net (losses)/gains from equity securities	(1,426)	(1,148)	5,736
Securities gains, net	853	1,695	211
Letters of credit commissions	7,103	6,741	6,407
Depository service fees	5,584	4,949	4,763
Other operating income	42,489	30,583	27,634
Total non-interest income	54,603	42,820	44,751
Non-Interest Expense
Salaries and employee benefits	132,795	124,022	129,300
Occupancy expense	20,318	20,634	22,004
Computer and equipment expense	13,549	11,133	11,113
Professional services expense	23,666	21,856	23,107
Data processing service expense	13,607	14,897	13,210
FDIC and State assessments	7,132	8,999	9,617
Marketing expense	6,913	5,224	7,585
Other real estate owned expense/(income)	343	(3,091)	1,115
Amortization of investments in low income housing and alternative energy partnerships	45,447	58,225	39,731
Amortization of core deposit premium	687	687	687
Cost associated with debt redemption	732	693	0
Acquisition, integration and reorganization costs	1,425	0	0
Other operating expense	19,909	20,186	19,819
Total non-interest expense	286,523	283,465	277,288
Income before income tax expense	381,843	253,965	349,369
Income tax expense	83,539	25,105	70,234
Net income	298,304	228,860	279,135
Other Comprehensive Income/(Loss), Net of Tax:
Unrealized holding gains/(losses) on securities available for sale	(11,388)	7,680	23,628
Unrealized holding (losses)/gains on cash flow hedge derivatives	3,614	(3,478)	(3,171)
Less: reclassification adjustment for gains included in net income	601	1,194	149
Total other comprehensive income/(loss), net of tax	(8,375)	3,008	20,308
Total comprehensive income	$ 289,929	$ 231,868	$ 299,443
Net Income Per Common Share
Basic (in dollars per share)	$ 3.81	$ 2.88	$ 3.49
Diluted (in dollars per share)	3.80	2.87	3.48
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)	$ 1.27	$ 1.24	$ 1.24
Average Common Shares Outstanding:
Basic (in shares)	78,268,369	79,584,560	79,999,703
Diluted (in shares)	78,570,638	79,777,847	80,247,893