Loan Portfolio and Allowance for Credit Losses - Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty (Details) - Payment Delay [Member]		3 Months Ended
		Mar. 31, 2026	Mar. 31, 2025
Loan Portfolio and Allowance for Credit Losses [Abstract]
Weighted average term		7 months	48 months
New York and Other States [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Weighted average term	[1]		48 months
Florida [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Weighted average term		7 months
First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Weighted average term		7 months	24 months
First Mortgages [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Weighted average term	[1]		24 months
First Mortgages [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Weighted average term		7 months
Home Equity Lines of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Weighted average term			24 months
Home Equity Lines of Credit [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Weighted average term	[1]		24 months

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