Loan Portfolio and Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Loan Portfolio and Allowance for Credit Losses [Abstract]
Balance at beginning of period		$ 51,265	$ 49,772	$ 50,248	$ 48,578	$ 48,578
Total loan charge offs		22	318	281	513
Total recoveries		198	96	724	385
Net loans (recoveries) charged off		(176)	222	(443)	128
Provision (credit) for credit losses		450	400	1,200	1,500
Balance at end of period		51,891	49,950	51,891	49,950	50,248
Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Balance at beginning of period		3,134	3,429	3,420	2,735	2,735
Total loan charge offs		0	65	4	65
Total recoveries		0	0	322	0
Net loans (recoveries) charged off		0	65	(318)	65
Provision (credit) for credit losses		(3)	(12)	(607)	682
Balance at end of period		3,131	3,352	3,131	3,352	3,420
Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Balance at beginning of period		47,877	46,129	46,636	45,625	45,625
Total loan charge offs		0	194	99	328
Total recoveries		194	90	373	359
Net loans (recoveries) charged off		(194)	104	(274)	(31)
Provision (credit) for credit losses		446	367	1,607	736
Balance at end of period		48,517	46,392	48,517	46,392	46,636
Installment [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Balance at beginning of period		254	214	192	218	218
Total loan charge offs		22	59	178	120	170
Total recoveries		4	6	29	26
Net loans (recoveries) charged off		18	53	149	94
Provision (credit) for credit losses		7	45	200	82
Balance at end of period		243	206	243	206	$ 192
New York and Other States [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loan charge offs	[1]	2	276	152	447
Total recoveries	[1]	198	96	409	385
New York and Other States [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loan charge offs	[1]	0	65	4	65
Total recoveries	[1]	0	0	7	0
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	194	99	311
Total recoveries	[1]	194	90	373	359
New York and Other States [Member] | Installment [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loan charge offs	[1]	2	17	49	71
Total recoveries	[1]	4	6	29	26
Florida [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loan charge offs		20	42	129	66
Total recoveries		0	0	315	0
Florida [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loan charge offs		0	0	0	0
Total recoveries		0	0	315	0
Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loan charge offs		0	0	0	17
Total recoveries		0	0	0	0
Florida [Member] | Installment [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total loan charge offs		20	42	129	49
Total recoveries		$ 0	$ 0	$ 0	$ 0

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