Loan Portfolio and Allowance for Credit Losses - Non-accrual Loans, By Loan Class (Details) - USD ($) $ in Thousands		Sep. 30, 2025	Dec. 31, 2024
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans			$ 18,800
Restructured real estate mortgages - 1 to 4 family			0
Total nonperforming loans		$ 18,477	18,800
Installment [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans		43	130
New York and Other States [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans	[1]		15,122
Restructured real estate mortgages - 1 to 4 family	[1]		0
Total nonperforming loans	[1]	14,890	15,122
New York and Other States [Member] | Installment [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans	[1]	30	108
Florida [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans			3,678
Restructured real estate mortgages - 1 to 4 family			0
Total nonperforming loans		3,587	3,678
Florida [Member] | Installment [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans		13	22
Commercial Real Estate [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans		285	329
Commercial Real Estate [Member] | New York and Other States [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans	[1]	285	329
Commercial Real Estate [Member] | Florida [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans		0	0
Other [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans		7	14
Other [Member] | New York and Other States [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans	[1]	7	14
Other [Member] | Florida [Member] | Commercial [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans		0	0
First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans		15,237	14,954
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]
Total non-accrual loans	[1]	11,923	11,586
First Mortgages [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans		3,314	3,368
Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans		424	526
Home Equity Loans [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans	[1]	419	432
Home Equity Loans [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans		5	94
Home Equity Lines of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans		2,481	2,847
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]
Total non-accrual loans	[1]	2,226	2,653
Home Equity Lines of Credit [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]
Loan Portfolio and Allowance for Credit Losses [Abstract]
Total non-accrual loans		$ 255	$ 194

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