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
		Mar. 31, 2024	Mar. 31, 2023
Financing Receivable Modifications Information [Abstract]
Loan modifications classifications from previously performing loans		$ 8,100	$ 8,800
Loan modifications		$ 85	$ 0
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.00%
New York and Other States [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications	[1]	$ 0
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable	[1]	0.00%
Florida [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications		$ 85
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.00%
Commercial [Member] | Commercial Real Estate [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications		$ 0
Commercial [Member] | Commercial Real Estate [Member] | New York and Other States [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications	[1]	0
Commercial [Member] | Commercial Real Estate [Member] | Florida [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications		0
Commercial [Member] | Other [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications		0
Commercial [Member] | Other [Member] | New York and Other States [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications	[1]	0
Commercial [Member] | Other [Member] | Florida [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications		0
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications		$ 85
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.00%
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | New York and Other States [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications	[1]	$ 0
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Florida [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications		$ 85
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.01%
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications		$ 0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | New York and Other States [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications	[1]	0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Florida [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications		0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications		0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | New York and Other States [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications	[1]	0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Florida [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications		0
Installment [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications		0
Installment [Member] | New York and Other States [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications	[1]	0
Installment [Member] | Florida [Member]
Financing Receivable Modifications Information [Abstract]
Loan modifications		0
Payment Delay [Member]
Financing Receivable Modifications [Abstract]
Loans modified		85
Payment Delay [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]	0
Payment Delay [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		85
Payment Delay [Member] | Commercial [Member] | Commercial Real Estate [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0
Payment Delay [Member] | Commercial [Member] | Commercial Real Estate [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]	0
Payment Delay [Member] | Commercial [Member] | Commercial Real Estate [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0
Payment Delay [Member] | Commercial [Member] | Other [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0
Payment Delay [Member] | Commercial [Member] | Other [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]	0
Payment Delay [Member] | Commercial [Member] | Other [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Financing Receivable Modifications [Abstract]
Loans modified		85
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]	0
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		85
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]
Financing Receivable Modifications [Abstract]
Loans modified		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
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		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
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
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
Payment Delay [Member] | Installment [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0
Payment Delay [Member] | Installment [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]	0
Payment Delay [Member] | Installment [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		$ 0

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