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Loans and Allowance for Loan Losses, Troubled Debt Restructurings (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Contract
Sep. 30, 2017
USD ($)
Contract
Sep. 30, 2018
USD ($)
Contract
Sep. 30, 2017
USD ($)
Contract
Dec. 31, 2017
USD ($)
Trouble Debt Restructuring Receivable [Abstract]          
TDR's classifications from previously performing loans $ 11,300   $ 11,300   $ 11,800
New York and Other States [Member]          
Modified loans by class determined to be TDR's [Abstract]          
Number of Contracts | Contract [1] 8 10 14 37  
Pre-Modification Outstanding Recorded Investment [1] $ 804 $ 1,237 $ 1,608 $ 5,203  
Post-Modification Outstanding Recorded Investment [1] $ 804 $ 1,237 $ 1,608 $ 5,203  
Florida [Member]          
Modified loans by class determined to be TDR's [Abstract]          
Number of Contracts | Contract 0 2 0 8  
Pre-Modification Outstanding Recorded Investment $ 0 $ 251 $ 0 $ 788  
Post-Modification Outstanding Recorded Investment $ 0 $ 251 $ 0 $ 788  
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] 0 0 0 3  
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0 $ 747  
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0 $ 747  
Commercial [Member] | Commercial Real Estate [Member] | Florida [Member]          
Modified loans by class determined to be TDR's [Abstract]          
Number of Contracts | Contract 0 0 0 0  
Pre-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0 $ 0  
Post-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0 $ 0  
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] 6 7 10 25  
Pre-Modification Outstanding Recorded Investment [1] $ 791 $ 941 $ 1,386 $ 3,986  
Post-Modification Outstanding Recorded Investment [1] $ 791 $ 941 $ 1,386 $ 3,986  
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 0 2 0 7  
Pre-Modification Outstanding Recorded Investment $ 0 $ 251 $ 0 $ 718  
Post-Modification Outstanding Recorded Investment $ 0 $ 251 $ 0 $ 718  
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] 1 0 1 1  
Pre-Modification Outstanding Recorded Investment [1] $ 6 $ 0 $ 6 $ 13  
Post-Modification Outstanding Recorded Investment [1] $ 6 $ 0 $ 6 $ 13  
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 0  
Pre-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0 $ 0  
Post-Modification Outstanding Recorded Investment $ 0 $ 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] 1 3 3 8  
Pre-Modification Outstanding Recorded Investment [1] $ 7 $ 296 $ 216 $ 457  
Post-Modification Outstanding Recorded Investment [1] $ 7 $ 296 $ 216 $ 457  
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 1  
Pre-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0 $ 70  
Post-Modification Outstanding Recorded Investment $ 0 $ 0 $ 0 $ 70  
[1] Includes New York, New Jersey, Vermont and Massachusetts.