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, 2023		Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable Modifications Information [Abstract]
Loan modifications classifications from previously performing loans		$ 8,700		$ 9,500	$ 8,700	$ 9,500
New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]			73		443
Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified				0		0
Commercial [Member] | Commercial Real Estate [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]			0		0
Commercial [Member] | Commercial Real Estate [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified				0		0
Real Estate Mortgage - 1 to 4 Family [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.01%			0.01%
Real Estate Mortgage - 1 to 4 Family [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.01%			0.01%
Real Estate Mortgage - 1 to 4 Family [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.02%			0.02%
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		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]
Loans modified	[1]			73		443
% of Total Class of Financing Receivable		0.01%	[1]		0.01%
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified				0		0
% of Total Class of Financing Receivable		0.02%			0.02%
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
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified				0		0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.02%			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]
Loans modified	[1]			0		0
% of Total Class of Financing Receivable		0.03%			0.03%
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified				$ 0		$ 0
Payment Delay [Member]
Financing Receivable Modifications [Abstract]
Loans modified		$ 630			$ 630
Payment Delay [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified		288	[1]		288
Payment Delay [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		342			342
Payment Delay [Member] | Commercial [Member] | Commercial Real Estate [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0			0
Payment Delay [Member] | Commercial [Member] | Commercial Real Estate [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0	[1]		0
Payment Delay [Member] | Commercial [Member] | Commercial Real Estate [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0			0
Payment Delay [Member] | Commercial [Member] | Other [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0			0
Payment Delay [Member] | Commercial [Member] | Other [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0	[1]		0
Payment Delay [Member] | Commercial [Member] | Other [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0			0
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0	[1]		0
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Financing Receivable Modifications [Abstract]
Loans modified		580			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		238	[1]		238
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		342			342
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]
Financing Receivable Modifications [Abstract]
Loans modified		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		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
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]
Financing Receivable Modifications [Abstract]
Loans modified		50			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		50	[1]		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		0			0
Payment Delay [Member] | Installment [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0			0
Payment Delay [Member] | Installment [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0	[1]		0
Payment Delay [Member] | Installment [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		$ 0			$ 0

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