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		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable Modifications Information [Abstract]
Loan modifications classifications from previously performing loans		$ 8,500	$ 9,300	$ 8,500	$ 9,300
New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]		282		719
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%		0.02%
Real Estate Mortgage - 1 to 4 Family [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable	[1]	0.01%		0.02%
Real Estate Mortgage - 1 to 4 Family [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable				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%		0.02%
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]		282		719
% of Total Class of Financing Receivable	[1]	0.01%		0.02%
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%
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%
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	[1]			0.02%
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		$ 255		$ 880
Payment Delay [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]	255		540
Payment Delay [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0		340
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	[1]	0		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	[1]	0		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	[1]	0		0
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Financing Receivable Modifications [Abstract]
Loans modified		255		830
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]	255		490
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0		340
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	[1]	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		0		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]	0		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	[1]	0		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.