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Loan Portfolio and Allowance for Credit Losses, Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 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 64 months   64 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] 40 months   40 months  
Florida [Member] | Payment Delay [Member]        
Financial Effect of Modifications Made to Borrowers Experiencing Financial Difficulty [Abstract]        
Weighted average term 24 months   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 46 months   46 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] 22 months   22 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   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   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   18 months  
[1] Includes New York, New Jersey, Vermont and Massachusetts.