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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Allowance for loan losses by portfolio segment [Roll Forward]
Balance at beginning of period					$ 44,267	$ 44,267
Balance at beginning of period		$ 46,914	$ 45,285	$ 46,032
Loans charged off [Abstract]
Total loan charge offs		50	47	189	118
Recoveries of loans previously charged off [Abstract]
Total recoveries		62	179	483	415
Net loans (recoveries) charged off		(12)	(132)	(294)	(297)
(Credit) provision for credit losses		300	100	900	(1,400)
Balance at end of period		47,226	45,517	47,226	45,517	46,032
Provision (benefit) for credit losses		100	300	(100)	(391)
Credit losses on unfunded commitments		200	200	1,000	1,000
New York and Other States [Member]
Loans charged off [Abstract]
Total loan charge offs	[1]	50	47	118	118
Recoveries of loans previously charged off [Abstract]
Total recoveries	[1]	62	177	458	413
Florida [Member]
Loans charged off [Abstract]
Total loan charge offs		0	0	71	0
Recoveries of loans previously charged off [Abstract]
Total recoveries		0	2	25	2
Commercial [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Balance at beginning of period					3,135	3,135
Balance at beginning of period		2,610	2,274	2,596
Loans charged off [Abstract]
Total loan charge offs		0	0	0	40
Recoveries of loans previously charged off [Abstract]
Total recoveries		0	0	129	4
Net loans (recoveries) charged off		0	0	(129)	36
(Credit) provision for credit losses		103	155	(12)	316
Balance at end of period		2,713	2,429	2,713	2,429	2,596
Commercial [Member] | New York and Other States [Member]
Loans charged off [Abstract]
Total loan charge offs	[1]	0	0	0	40
Recoveries of loans previously charged off [Abstract]
Total recoveries	[1]	0	0	129	4
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					40,689	40,689
Balance at beginning of period		44,067	42,880	43,271
Loans charged off [Abstract]
Total loan charge offs		27	13	49	25
Recoveries of loans previously charged off [Abstract]
Total recoveries		53	177	314	405
Net loans (recoveries) charged off		(26)	(164)	(265)	(380)
(Credit) provision for credit losses		192	(100)	749	(1,842)
Balance at end of period		44,285	42,944	44,285	42,944	43,271
Real Estate Mortgage - 1 to 4 Family [Member] | New York and Other States [Member]
Loans charged off [Abstract]
Total loan charge offs	[1]	27	13	49	25
Recoveries of loans previously charged off [Abstract]
Total recoveries	[1]	53	177	289	405
Real Estate Mortgage - 1 to 4 Family [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	25	0
Installment [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Balance at beginning of period					443	443
Balance at beginning of period		237	131	165
Loans charged off [Abstract]
Total loan charge offs		23	34	140	53	88
Recoveries of loans previously charged off [Abstract]
Total recoveries		9	2	40	6
Net loans (recoveries) charged off		14	32	100	47
(Credit) provision for credit losses		5	45	163	126
Balance at end of period		228	144	228	144	165
Installment [Member] | New York and Other States [Member]
Loans charged off [Abstract]
Total loan charge offs	[1]	23	34	69	53
Recoveries of loans previously charged off [Abstract]
Total recoveries	[1]	9	0	40	4
Installment [Member] | Florida [Member]
Loans charged off [Abstract]
Total loan charge offs		0	0	71	0
Recoveries of loans previously charged off [Abstract]
Total recoveries		$ 0	$ 2	$ 0	2
ASU 2016-13 [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Balance at beginning of period					46,620	46,620
ASU 2016-13 [Member] | Commercial [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Balance at beginning of period					2,149	2,149
ASU 2016-13 [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Balance at beginning of period					44,406	44,406
ASU 2016-13 [Member] | Installment [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Balance at beginning of period					65	65
ASU 2016-13 [Member] | Impact of Adoption [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Balance at beginning of period					2,353	2,353
ASU 2016-13 [Member] | Impact of Adoption [Member] | Commercial [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Balance at beginning of period					(986)	(986)
ASU 2016-13 [Member] | Impact of Adoption [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Balance at beginning of period					3,717	3,717
ASU 2016-13 [Member] | Impact of Adoption [Member] | Installment [Member]
Allowance for loan losses by portfolio segment [Roll Forward]
Balance at beginning of period					$ (378)	$ (378)

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