Loan Portfolio and Allowance for Credit Losses - Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty (Details) - Payment Delay [Member]		3 Months Ended		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Loan Portfolio and Allowance for Credit Losses [Abstract]
Weighted average term		9 months	43 months	57 months	54 months
New York and Other States [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Weighted average term	[1]		34 months	48 months	33 months
Florida [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Weighted average term		9 months	9 months	9 months	21 months
First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Weighted average term		9 months	22 months	33 months	27 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]		22 months	24 months	15 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		9 months		9 months	12 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			12 months	24 months	18 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]		12 months	24 months	18 months
Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Weighted average term			9 months		9 months
Home Equity Loans [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Weighted average term			9 months		9 months

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