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Loans and Allowance for Loan Losses, Troubled Debt Restructurings (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Contract
Jun. 30, 2017
USD ($)
Contract
Jun. 30, 2018
USD ($)
Contract
Jun. 30, 2017
USD ($)
Contract
Dec. 31, 2017
USD ($)
Trouble Debt Restructuring Receivable [Abstract]          
TDR's classifications from previously performing loans $ 10,000   $ 10,000   $ 11,800
New York and Other States [Member]          
Modified loans by class determined to be TDR's [Abstract]          
Number of Contracts | Contract [1] 2 11 6 27  
Pre-Modification Outstanding Recorded Investment [1] $ 125 $ 1,848 $ 806 $ 3,966  
Post-Modification Outstanding Recorded Investment [1] $ 125 $ 1,848 $ 806 $ 3,966  
Florida [Member]          
Modified loans by class determined to be TDR's [Abstract]          
Number of Contracts | Contract 0 4 0 6  
Pre-Modification Outstanding Recorded Investment $ 0 $ 387 $ 0 $ 537  
Post-Modification Outstanding Recorded Investment $ 0 $ 387 $ 0 $ 537  
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 3 0 3  
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 747 $ 0 $ 747  
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 747 $ 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      
Pre-Modification Outstanding Recorded Investment $ 0 $ 0      
Post-Modification Outstanding Recorded Investment $ 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] 2 7 4 18  
Pre-Modification Outstanding Recorded Investment [1] $ 125 $ 1,098 $ 598 $ 3,045  
Post-Modification Outstanding Recorded Investment [1] $ 125 $ 1,098 $ 598 $ 3,045  
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 4 0 5  
Pre-Modification Outstanding Recorded Investment $ 0 $ 387 $ 0 $ 467  
Post-Modification Outstanding Recorded Investment $ 0 $ 387 $ 0 $ 467  
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 0 1  
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0 $ 13  
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 0 $ 0 $ 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  
Pre-Modification Outstanding Recorded Investment     $ 0 $ 0  
Post-Modification Outstanding Recorded Investment     $ 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] 0 1 2 5  
Pre-Modification Outstanding Recorded Investment [1] $ 0 $ 3 $ 208 $ 161  
Post-Modification Outstanding Recorded Investment [1] $ 0 $ 3 $ 208 $ 161  
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.