Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest and Dividend Income
Loan receivable	$ 801,981	$ 649,224	$ 677,193
Investment securities	28,240	14,151	20,599
Federal Home Loan Bank stock	1,103	991	952
Deposits with banks	19,957	2,145	1,830
Total interest and dividend income	851,281	666,511	700,574
Interest Expense
Time deposits	56,354	40,542	111,629
Other deposits	48,942	21,259	25,396
Advances from the Federal Home Loan Bank	5,880	1,182	5,299
Long-term debt	5,546	5,773	5,791
Deferred payments from acquisition	0	0	115
Short-term borrowings	862	0	234
Total interest expense	117,584	68,756	148,464
Net interest income before provision/(reversal) for credit losses	733,697	597,755	552,110
Provision/(reversal) for credit losses	(14,543)	16,008	(57,500)
Net interest income after provision/(reversal) for credit losses	719,154	613,763	494,610
Non-Interest Income
Net gains/(losses) from equity securities	392	(1,426)	(1,148)
Securities gains, net	0	853	1,695
Letters of credit commissions	6,351	7,103	6,741
Other operating income	27,112	27,433	20,054
Total non-interest income	56,814	54,603	42,820
Non-Interest Expense
Salaries and employee benefits	142,546	132,795	124,022
Occupancy expense	22,808	20,318	20,634
Computer and equipment expense	13,603	13,549	11,133
Professional services expense	28,237	23,666	21,856
Data processing service expense	13,181	13,607	14,897
FDIC and State assessments	8,037	7,132	8,999
Marketing expense	6,863	6,913	5,224
Other real estate owned expense/(income)	127	343	(3,091)
Amortization of investments in low income housing and alternative energy partnerships	42,065	45,447	58,225
Amortization of core deposit premium	1,892	687	687
Cost associated with debt redemption	0	732	693
Acquisition, integration and reorganization costs	4,127	1,425	0
Other operating expense	19,946	19,909	20,186
Total non-interest expense	303,432	286,523	283,465
Income before income tax expense	472,536	381,843	253,965
Income tax expense	111,894	83,539	25,105
Net income	360,642	298,304	228,860
Other Comprehensive Income/(Loss), Net of Tax:
Net holding (losses)/gains on securities available-for-sale	(105,043)	(11,989)	6,486
Loss, net of taxes (1)	5,813	3,614	(3,478)
Total other comprehensive income/(loss), net of tax	(99,230)	(8,375)	3,008
Total comprehensive income/(loss)	$ 261,412	$ 289,929	$ 231,868
Net Income Per Common Share
Basic (in dollars per share)	$ 4.85	$ 3.81	$ 2.88
Diluted (in dollars per share)	4.83	3.80	2.87
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)	$ 1.36	$ 1.27	$ 1.24
Average Common Shares Outstanding:
Basic (in shares)	74,337,265	78,268,369	79,584,560
Diluted (in shares)	74,664,735	78,570,638	79,777,847
Deposit Account [Member]
Non-Interest Income
Non-Interest Income	$ 6,523	$ 5,584	$ 4,949
Asset Management [Member]
Non-Interest Income
Non-Interest Income	$ 16,436	$ 15,056	$ 10,529