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Loans and Allowance for Loan Losses, Troubled Debt Restructurings (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Contract
Dec. 31, 2019
USD ($)
Contract
Dec. 31, 2018
USD ($)
Contract
Financing Receivable Modifications Information [Abstract]      
TDR's classifications from previously performing loans $ 11,700 $ 11,100  
New York and Other States [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract [1] 16 21 30
Pre-Modification Outstanding Recorded Investment [1] $ 2,597 $ 2,981 $ 3,427
Post-Modification Outstanding Recorded Investment [1] $ 2,597 $ 2,981 $ 3,427
Florida [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract 4 6 1
Pre-Modification Outstanding Recorded Investment $ 586 $ 632 $ 35
Post-Modification Outstanding Recorded Investment $ 586 $ 632 $ 35
Commercial [Member] | Commercial Real Estate [Member] | New York and Other States [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract [1] 1 1 6
Pre-Modification Outstanding Recorded Investment [1] $ 125 $ 125 $ 747
Post-Modification Outstanding Recorded Investment [1] $ 125 $ 125 $ 747
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | New York and Other States [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract [1] 12 18 18
Pre-Modification Outstanding Recorded Investment [1] $ 2,303 $ 2,621 $ 2,349
Post-Modification Outstanding Recorded Investment [1] $ 2,303 $ 2,621 $ 2,349
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Florida [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract 4 6 1
Pre-Modification Outstanding Recorded Investment $ 586 $ 632 $ 35
Post-Modification Outstanding Recorded Investment $ 586 $ 632 $ 35
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | New York and Other States [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract [1] 0 0 1
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 6
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 6
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Florida [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract 0 0 0
Pre-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | New York and Other States [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract [1] 3 2 5
Pre-Modification Outstanding Recorded Investment [1] $ 169 $ 235 $ 325
Post-Modification Outstanding Recorded Investment [1] $ 169 $ 235 $ 325
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Florida [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract 0 0 0
Pre-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0
Post-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0
[1] Includes New York, New Jersey, Vermont and Massachusetts.