Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest and Dividend Income
Loan receivable	$ 1,130,242	$ 801,981	$ 649,224
Investment securities	51,717	28,240	14,151
Federal Home Loan Bank stock	1,349	1,103	991
Deposits with banks	58,914	19,957	2,145
Total interest and dividend income	1,242,222	851,281	666,511
Interest Expense
Time deposits	331,997	56,354	40,542
Other deposits	135,965	48,942	21,259
Advances from the Federal Home Loan Bank	22,164	5,880	1,182
Long-term debt	6,480	5,546	5,773
Short-term borrowings	3,870	862	0
Total interest expense	500,476	117,584	68,756
Net interest income before provision for credit losses	741,746	733,697	597,755
Provision/(reversal) for credit losses	(25,978)	(14,543)	16,008
Net interest income after provision for credit losses	715,768	719,154	613,763
Non-Interest Income
Net gains/(losses) from equity securities	18,248	392	(1,426)
Securities (losses)/gains, net	(3,000)	0	853
Letters of credit commissions	6,716	6,351	7,103
Other operating income	22,390	27,112	27,433
Total non-interest income	68,292	56,814	54,603
Non-Interest Expense
Salaries and employee benefits	154,149	142,546	132,795
Occupancy expense	22,270	22,808	20,318
Computer and equipment expense	17,478	13,603	13,549
Professional services expense	32,491	28,237	23,666
Data processing service expense	14,728	13,181	13,607
FDIC and State assessments	23,588	8,037	7,132
Marketing expense	5,887	6,863	6,913
Other real estate owned expense	761	127	343
Amortization of investments in low income housing and Alternative energy partnerships	86,616	42,065	45,447
Amortization of core deposit premium	1,310	1,892	687
Cost associated with debt redemption	0	0	732
Acquisition, integration and reorganization costs	671	4,127	1,425
Other operating expense	20,529	19,946	19,909
Total non-interest expense	380,478	303,432	286,523
Income before income tax expense	403,582	472,536	381,843
Income tax expense	49,458	111,894	83,539
Net income	354,124	360,642	298,304
Other Comprehensive Income/(Loss), Net of Tax:
Net holding gains/(losses) on securities available-for-sale	18,642	(105,043)	(11,989)
Net holding (losses)/gains on cash flow hedge derivatives	(1,763)	5,813	3,614
Total other comprehensive income/(loss), net of tax	16,879	(99,230)	(8,375)
Total comprehensive income	$ 371,003	$ 261,412	$ 289,929
Net Income Per Common Share
Basic (in dollars per share)	$ 4.88	$ 4.85	$ 3.81
Diluted (in dollars per share)	4.86	4.83	3.8
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)	$ 1.36	$ 1.36	$ 1.27
Average Common Shares Outstanding:
Basic (in shares)	72,573,025	74,337,265	78,268,369
Diluted (in shares)	72,862,628	74,664,735	78,570,638
Deposit Account [Member]
Non-Interest Income
Non-Interest Income	$ 6,432	$ 6,523	$ 5,584
Asset Management [Member]
Non-Interest Income
Non-Interest Income	$ 17,506	$ 16,436	$ 15,056