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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Allowance for loan losses by portfolio segment [Roll Forward]
Balance at beginning of period		$ 49,772	$ 46,914	$ 48,578	$ 46,032	$ 46,032
Loans charged off [Abstract]
Total loan charge offs		318	50	513	189
Recoveries of loans previously charged off [Abstract]
Total recoveries		96	62	385	483
Net loans (recoveries) charged off		222	(12)	128	(294)
Provision (credit) for credit losses		400	300	1,500	900
Balance at end of period		49,950	47,226	49,950	47,226	48,578
Provision (benefit) for credit losses		500	100	1,600	(100)
Credit losses on unfunded commitments		100	200	100	1,000
New York and Other States [Member]
Loans charged off [Abstract]
Total loan charge offs	[1]	276	50	447	118
Recoveries of loans previously charged off [Abstract]
Total recoveries	[1]	96	62	385	458
Florida [Member]
Loans charged off [Abstract]
Total loan charge offs		42	0	66	71
Recoveries of loans previously charged off [Abstract]
Total recoveries		0	0	0	25
Commercial [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Balance at beginning of period		3,429	2,610	2,735	2,596	2,596
Loans charged off [Abstract]
Total loan charge offs		65	0	65	0
Recoveries of loans previously charged off [Abstract]
Total recoveries		0	0	0	129
Net loans (recoveries) charged off		65	0	65	(129)
Provision (credit) for credit losses		(12)	103	682	(12)
Balance at end of period		3,352	2,713	3,352	2,713	2,735
Commercial [Member] | New York and Other States [Member]
Loans charged off [Abstract]
Total loan charge offs	[1]	65	0	65	0
Recoveries of loans previously charged off [Abstract]
Total recoveries	[1]	0	0	0	129
Commercial [Member] | Florida [Member]
Loans charged off [Abstract]
Total loan charge offs		0	0	0	0
Recoveries of loans previously charged off [Abstract]
Total recoveries		0	0	0	0
Real Estate Mortgage - 1 to 4 Family [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Balance at beginning of period		46,129	44,067	45,625	43,271	43,271
Loans charged off [Abstract]
Total loan charge offs		194	27	328	49
Recoveries of loans previously charged off [Abstract]
Total recoveries		90	53	359	314
Net loans (recoveries) charged off		104	(26)	(31)	(265)
Provision (credit) for credit losses		367	192	736	749
Balance at end of period		46,392	44,285	46,392	44,285	45,625
Real Estate Mortgage - 1 to 4 Family [Member] | New York and Other States [Member]
Loans charged off [Abstract]
Total loan charge offs	[1]	194	27	311	49
Recoveries of loans previously charged off [Abstract]
Total recoveries	[1]	90	53	359	289
Real Estate Mortgage - 1 to 4 Family [Member] | Florida [Member]
Loans charged off [Abstract]
Total loan charge offs		0	0	17	0
Recoveries of loans previously charged off [Abstract]
Total recoveries		0	0	0	25
Installment [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Balance at beginning of period		214	237	218	165	165
Loans charged off [Abstract]
Total loan charge offs		59	23	120	140	176
Recoveries of loans previously charged off [Abstract]
Total recoveries		6	9	26	40
Net loans (recoveries) charged off		53	14	94	100
Provision (credit) for credit losses		45	5	82	163
Balance at end of period		206	228	206	228	$ 218
Installment [Member] | New York and Other States [Member]
Loans charged off [Abstract]
Total loan charge offs	[1]	17	23	71	69
Recoveries of loans previously charged off [Abstract]
Total recoveries	[1]	6	9	26	40
Installment [Member] | Florida [Member]
Loans charged off [Abstract]
Total loan charge offs		42	0	49	71
Recoveries of loans previously charged off [Abstract]
Total recoveries		$ 0	$ 0	$ 0	$ 0

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