Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Loan receivable	$ 1,206,547	$ 1,217,166	$ 1,130,242
Investment securities	51,964	59,307	51,717
Federal Home Loan Bank stock	1,508	1,684	1,349
Deposits with banks	49,241	56,818	58,914
Total interest and dividend income	1,309,260	1,334,975	1,242,222
Interest Expense
Time deposits	374,232	458,490	331,997
Other deposits	177,618	177,775	135,965
Advances from the Federal Home Loan Bank	6,248	14,283	22,164
Long-term debt	8,048	8,129	6,480
Short-term borrowings	654	2,243	3,870
Total interest expense	566,800	660,920	500,476
Net interest income before provision for credit losses	742,460	674,055	741,746
Provision for credit losses	72,631	37,500	25,978
Net interest income after provision for credit losses	669,829	636,555	715,768
Non-Interest Income
Net gains/(losses) from equity securities	7,392	(7,516)	18,248
Net gains/(losses) from securities available for sale	0	1,107	(3,000)
Letters of credit commissions	8,799	7,749	6,716
Other operating income	27,980	23,695	22,390
Total non-interest income	75,432	55,664	68,292
Non-Interest Expense
Salaries and employee benefits	177,427	167,376	154,149
Occupancy expense	23,657	23,281	22,270
Computer and equipment expense	23,234	20,135	17,478
Professional services expense	31,692	30,986	32,491
Data processing service expense	17,466	16,370	14,728
FDIC and State assessments	11,382	14,279	23,588
Marketing expense	6,003	6,520	5,887
Other real estate owned (income)/expense	(1,152)	2,699	761
Amortization of investments in low-income housing and Alternative energy partnerships	43,614	72,633	86,616
Amortization of Intangible Assets	946	1,098	1,310
Acquisition, integration and reorganization costs	0	0	671
Other operating expense	20,794	19,300	20,529
Total non-interest expense	355,063	374,677	380,478
Income before income tax expense	390,198	317,542	403,582
Income tax expense	75,074	31,563	49,458
Net income	315,124	285,979	354,124
Other Comprehensive Income/(Loss), Net of Tax:
Net holding gains on securities available-for-sale	31,207	583	18,642
Net holding losses on cash flow hedge derivatives	0	(774)	(1,763)
Total other comprehensive income/(loss), net of tax	31,207	(191)	16,879
Total comprehensive income	$ 346,331	$ 285,788	$ 371,003
Net Income Per Common Share
Basic (in dollars per share)	$ 4.55	$ 3.97	$ 4.88
Diluted (in dollars per share)	4.54	3.95	4.86
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)	$ 1.36	$ 1.36	$ 1.36
Average Common Shares Outstanding:
Basic (in shares)	69,184,832	72,068,850	72,573,025
Diluted (in shares)	69,451,260	72,327,017	72,862,628
Deposit Account [Member]
Non-Interest Income
Non-Interest Income	$ 7,573	$ 6,574	$ 6,432
Asset Management [Member]
Non-Interest Income
Non-Interest Income	$ 23,688	$ 24,055	$ 17,506