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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Financing Receivable Modifications Information [Abstract]
Loan modifications classifications from previously performing loans		$ 7,000		$ 7,000		$ 7,000
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]	0.00%	0.01%	0.02%	0.01%
Florida [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.00%	0.00%	0.00%	0.01%
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.01%	0.00%	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				0.00%	0.01%
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.00%
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.00%		0.00%
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]
Financing Receivable Modifications [Abstract]
% of Total Class of Financing Receivable		0.00%	0.05%	0.00%	0.05%
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]	0.00%	0.05%	0.05%	0.05%
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		0.00%	0.04%	0.00%	0.04%
Payment Delay [Member]
Financing Receivable Modifications [Abstract]
Loans modified		$ 319	$ 361	$ 516	$ 446
Payment Delay [Member] | New York and Other States [Member]
Financing Receivable Modifications [Abstract]
Loans modified	[1]	319	305	516	305
Payment Delay [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0	56	0	141
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		319	194	394	279
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]	319	194	394	194
Payment Delay [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Florida [Member]
Financing Receivable Modifications [Abstract]
Loans modified		0	0	0	85
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		0	167	122	167
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	111	122	111
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	56	0	56
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.