Loan Portfolio and Allowance for Credit Losses, Amortized Cost Basis of Loans Modified to Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable Modifications Information [Abstract]
Loan modifications classifications from previously performing loans		$ 7,700	$ 8,300	$ 7,700	$ 8,300
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.01%	0.01%	0.01%	0.01%
New York and Other States [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable	[1]	0.01%	0.01%	0.01%	0.01%
Florida [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.00%	0.02%	0.01%	0.02%
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.00%	0.01%	0.01%	0.01%
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable	[1]	0.01%	0.01%	0.01%	0.01%
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable			0.02%	0.01%	0.02%
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.05%	0.02%	0.05%	0.02%
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable	[1]	0.05%	0.03%	0.05%	0.03%
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.04%		0.04%
Payment Delay [Member]
Financing Receivable Modifications [Abstract]
Loans modified		$ 361	$ 630	$ 446	$ 630
Payment Delay [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]	305	288	305	288
Payment Delay [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		56	342	141	342
Payment Delay [Member] | Commercial [Member] | Commercial Real Estate [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0	0	0	0
Payment Delay [Member] | Commercial [Member] | Commercial Real Estate [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]	0	0	0	0
Payment Delay [Member] | Commercial [Member] | Commercial Real Estate [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0	0	0	0
Payment Delay [Member] | Commercial [Member] | Other [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0	0	0	0
Payment Delay [Member] | Commercial [Member] | Other [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]	0	0	0	0
Payment Delay [Member] | Commercial [Member] | Other [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0	0	0	0
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Financing Receivable Modifications [Abstract]
Loans modified		194	580	279	580
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]	194	238	194	238
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0	342	85	342
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0	0	0	0
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]	0	0	0	0
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0	0	0	0
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]
Financing Receivable Modifications [Abstract]
Loans modified		167	50	167	50
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]	111	50	111	50
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		56	0	56	0
Payment Delay [Member] | Installment [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0	0	0	0
Payment Delay [Member] | Installment [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]	0	0	0	0
Payment Delay [Member] | Installment [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		$ 0	$ 0	$ 0	$ 0

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