INCOME TAXES - Schedule of the Reconciliation of Federal and State Income Taxes at Statutory rates to the Income Taxes Included in the Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income taxes at federal statutory rate	$ 39,194	$ 32,194	$ 32,320
State and local income taxes (net of federal income tax effect)	14,470	10,890	10,072
Low income housing tax credits	(7,954)	(5,657)	(11,243)
New markets tax credits	(9,008)	(9,474)	(2,416)
Other credits	(1,589)	(883)	(1,306)
Tax-exempt interest, net	(2,148)	(1,141)	(1,493)
Compensation	3,079	407	(217)
Other nontaxable or nondeductible	546
Other nontaxable or nondeductible		(381)	(793)
Investment in partnerships	14,692	13,244	5,714
Other	96	414	701
Income taxes	$ 51,378	$ 39,613	$ 31,339
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income taxes at federal statutory rate	21.00%	21.00%	21.00%
State and local income taxes (net of federal income tax effect)	7.80%	7.10%	6.50%
Low income housing tax credits	(4.30%)	(3.70%)	(7.30%)
New markets tax credits	(4.80%)	(6.20%)	(1.60%)
Other credits	(0.90%)	(0.60%)	(0.80%)
Tax-exempt interest, net	(1.20%)	(0.70%)	(1.00%)
Compensation	1.70%	0.30%	(0.10%)
Other nontaxable or nondeductible	0.20%
Other nontaxable or nondeductible		(0.30%)	(0.50%)
Investment in partnerships	7.90%	8.60%	3.70%
Other	0.10%	0.30%	0.50%
Effective income tax rate	27.50%	25.80%	20.40%