Loan Portfolio and Allowance for Credit Losses, Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty [Abstract]
Loan commitments to lend additional funds to borrowers		$ 0		$ 0
Charge-off from loan modifications				0
Allowance for credit loss from loan modifications		0		0
Loan modifications from payment default		$ 0	$ 0	$ 0	$ 0
Payment Delay [Member]
Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty [Abstract]
Weighted average term		18 months		62 months
New York and Other States [Member] | Payment Delay [Member]
Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty [Abstract]
Weighted average term	[1]	18 months		38 months
Florida [Member] | Payment Delay [Member]
Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty [Abstract]
Weighted average term				24 months
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Payment Delay [Member]
Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty [Abstract]
Weighted average term		18 months		44 months
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | New York and Other States [Member] | Payment Delay [Member]
Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty [Abstract]
Weighted average term	[1]	18 months		20 months
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Florida [Member] | Payment Delay [Member]
Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty [Abstract]
Weighted average term				24 months
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Payment Delay [Member]
Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty [Abstract]
Weighted average term				18 months
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | New York and Other States [Member] | Payment Delay [Member]
Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty [Abstract]
Weighted average term	[1]			18 months

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