Loan Portfolio and Allowance for Credit Losses - Activity in Allowance For Credit Losses on Loans by Portfolio Segment (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Loan Portfolio and Allowance for Credit Losses [Abstract]
Balance at beginning of period		$ 52,205	$ 50,248	$ 50,248
Total loan charge offs		45	124
Total recoveries		84	382
Net loan (recoveries) charged off		(39)	(258)
Provision (credit) for credit losses		750	100
Balance at end of period		52,994	50,606	52,205
Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Balance at beginning of period		3,081	3,420	3,420
Total loan charge offs		19	4
Total recoveries		40	320
Net loan (recoveries) charged off		(21)	(316)
Provision (credit) for credit losses		31	(713)
Balance at end of period		3,133	3,023	3,081
Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Balance at beginning of period		48,895	46,636	46,636
Total loan charge offs		0	80
Total recoveries		43	41
Net loan (recoveries) charged off		(43)	39
Provision (credit) for credit losses		714	710
Balance at end of period		49,652	47,307	48,895
Installment [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Balance at beginning of period		229	192	192
Total loan charge offs		26	40	217
Total recoveries		1	21
Net loan (recoveries) charged off		25	19
Provision (credit) for credit losses		5	103
Balance at end of period		209	276	$ 229
New York and Other States [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loan charge offs	[1]	31	109
Total recoveries	[1]	44	68
New York and Other States [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loan charge offs	[1]	19	4
Total recoveries	[1]	0	6
New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loan charge offs	[1]	0	80
Total recoveries	[1]	43	41
New York and Other States [Member] | Installment [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loan charge offs	[1]	12	25
Total recoveries	[1]	1	21
Florida [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loan charge offs		14	15
Total recoveries		40	314
Florida [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loan charge offs		0	0
Total recoveries		40	314
Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loan charge offs		0	0
Total recoveries		0	0
Florida [Member] | Installment [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loan charge offs		14	15
Total recoveries		$ 0	$ 0

[1] Includes New York, New Jersey, Vermont and Massachusetts.