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Loans and Allowance for Loan Losses, Troubled Debt Restructurings (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Contract
Dec. 31, 2018
USD ($)
Contract
Dec. 31, 2017
USD ($)
Contract
Financing Receivable Modifications Information [Abstract]      
TDR's classifications from previously performing loans $ 11,100 $ 11,100  
New York and Other States [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract [1] 21 30 69
Pre-Modification Outstanding Recorded Investment [1] $ 2,981 $ 3,427 $ 7,003
Post-Modification Outstanding Recorded Investment [1] $ 2,981 $ 3,427 $ 7,003
Florida [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract 6 1 12
Pre-Modification Outstanding Recorded Investment $ 632 $ 35 $ 1,171
Post-Modification Outstanding Recorded Investment $ 632 $ 35 $ 1,171
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 6 4
Pre-Modification Outstanding Recorded Investment [1] $ 125 $ 747 $ 426
Post-Modification Outstanding Recorded Investment [1] $ 125 $ 747 $ 426
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] 18 18 44
Pre-Modification Outstanding Recorded Investment [1] $ 2,621 $ 2,349 $ 5,653
Post-Modification Outstanding Recorded Investment [1] $ 2,621 $ 2,349 $ 5,653
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 6 1 10
Pre-Modification Outstanding Recorded Investment $ 632 $ 35 $ 1,076
Post-Modification Outstanding Recorded Investment $ 632 $ 35 $ 1,076
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 1 3
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 6 $ 56
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 6 $ 56
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] 2 5 18
Pre-Modification Outstanding Recorded Investment [1] $ 235 $ 325 $ 868
Post-Modification Outstanding Recorded Investment [1] $ 235 $ 325 $ 868
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 2
Pre-Modification Outstanding Recorded Investment $ 0 $ 0 $ 95
Post-Modification Outstanding Recorded Investment $ 0 $ 0 $ 95
[1] Includes New York, New Jersey, Vermont and Massachusetts.