Loan Portfolio and Allowance for Credit Losses, Allowance for Credit Losses (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2023	Mar. 31, 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		$ 46,032
Loans charged off [Abstract]
Total loan charge offs		48	47
Recoveries of loans previously charged off [Abstract]
Total recoveries		101	105
Net loans (recoveries) charged off		(53)	(58)
(Credit) provision for credit losses		600	(500)
Balance at end of period		46,685	46,178	46,032
New York and Other States [Member]
Loans charged off [Abstract]
Total loan charge offs	[1]	17	46
Recoveries of loans previously charged off [Abstract]
Total recoveries	[1]	76	105
Florida [Member]
Loans charged off [Abstract]
Total loan charge offs		31	1
Recoveries of loans previously charged off [Abstract]
Total recoveries		25	0
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		2,596
Loans charged off [Abstract]
Total loan charge offs		0	36
Recoveries of loans previously charged off [Abstract]
Total recoveries		0	0
Net loans (recoveries) charged off		0	36
(Credit) provision for credit losses		112	64
Balance at end of period		2,708	2,177	2,596
Commercial [Member] | New York and Other States [Member]
Loans charged off [Abstract]
Total loan charge offs	[1]	0	36
Recoveries of loans previously charged off [Abstract]
Total recoveries	[1]	0	0
Commercial [Member] | Florida [Member]
Loans charged off [Abstract]
Total loan charge offs		0	0
Recoveries of loans previously charged off [Abstract]
Total recoveries		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		43,271
Loans charged off [Abstract]
Total loan charge offs		0	0
Recoveries of loans previously charged off [Abstract]
Total recoveries		78	97
Net loans (recoveries) charged off		(78)	(97)
(Credit) provision for credit losses		417	(572)
Balance at end of period		43,766	43,931	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]	0	0
Recoveries of loans previously charged off [Abstract]
Total recoveries	[1]	53	97
Real Estate Mortgage - 1 to 4 Family [Member] | Florida [Member]
Loans charged off [Abstract]
Total loan charge offs		0	0
Recoveries of loans previously charged off [Abstract]
Total recoveries		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		165
Loans charged off [Abstract]
Total loan charge offs		48	11	88
Recoveries of loans previously charged off [Abstract]
Total recoveries		23	8
Net loans (recoveries) charged off		25	3
(Credit) provision for credit losses		71	8
Balance at end of period		211	70	165
Installment [Member] | New York and Other States [Member]
Loans charged off [Abstract]
Total loan charge offs	[1]	17	10
Recoveries of loans previously charged off [Abstract]
Total recoveries	[1]	23	8
Installment [Member] | Florida [Member]
Loans charged off [Abstract]
Total loan charge offs		31	1
Recoveries of loans previously charged off [Abstract]
Total recoveries		$ 0	0
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.