Loan Portfolio and Allowance for Credit Losses, Allowance for Credit Losses (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Allowance for loan losses by portfolio segment [Roll Forward]
Balance at beginning of period		$ 49,220	$ 46,685	$ 48,578	$ 46,032	$ 46,032
Loans charged off [Abstract]
Total loan charge offs		34	91	195	139
Recoveries of loans previously charged off [Abstract]
Total recoveries		86	320	289	421
Net loans (recoveries) charged off		(52)	(229)	(94)	(282)
Provision (credit) for credit losses		500	0	1,100	600
Balance at end of period		49,772	46,914	49,772	46,914	48,578
Provision (benefit) for credit losses		500	(500)	1,100	(200)
Credit losses on unfunded commitments		0	(500)	0	(800)
New York and Other States [Member]
Loans charged off [Abstract]
Total loan charge offs	[1]	10	51	171	68
Recoveries of loans previously charged off [Abstract]
Total recoveries	[1]	86	320	289	396
Florida [Member]
Loans charged off [Abstract]
Total loan charge offs		24	40	24	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		2,742	2,708	2,735	2,596	2,596
Loans charged off [Abstract]
Total loan charge offs		0	0	0	0
Recoveries of loans previously charged off [Abstract]
Total recoveries		0	129	0	129
Net loans (recoveries) charged off		0	(129)	0	(129)
Provision (credit) for credit losses		687	(227)	694	(115)
Balance at end of period		3,429	2,610	3,429	2,610	2,735
Commercial [Member] | New York and Other States [Member]
Loans charged off [Abstract]
Total loan charge offs	[1]	0	0	0	0
Recoveries of loans previously charged off [Abstract]
Total recoveries	[1]	0	129	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		46,295	43,766	45,625	43,271	43,271
Loans charged off [Abstract]
Total loan charge offs		17	22	134	22
Recoveries of loans previously charged off [Abstract]
Total recoveries		74	183	269	261
Net loans (recoveries) charged off		(57)	(161)	(135)	(239)
Provision (credit) for credit losses		(223)	140	369	557
Balance at end of period		46,129	44,067	46,129	44,067	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]	0	22	117	22
Recoveries of loans previously charged off [Abstract]
Total recoveries	[1]	74	183	269	236
Real Estate Mortgage - 1 to 4 Family [Member] | Florida [Member]
Loans charged off [Abstract]
Total loan charge offs		17	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		183	211	218	165	165
Loans charged off [Abstract]
Total loan charge offs		17	69	61	117	176
Recoveries of loans previously charged off [Abstract]
Total recoveries		12	8	20	31
Net loans (recoveries) charged off		5	61	41	86
Provision (credit) for credit losses		36	87	37	158
Balance at end of period		214	237	214	237	$ 218
Installment [Member] | New York and Other States [Member]
Loans charged off [Abstract]
Total loan charge offs	[1]	10	29	54	46
Recoveries of loans previously charged off [Abstract]
Total recoveries	[1]	12	8	20	31
Installment [Member] | Florida [Member]
Loans charged off [Abstract]
Total loan charge offs		7	40	7	71
Recoveries of loans previously charged off [Abstract]
Total recoveries		$ 0	$ 0	$ 0	$ 0

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