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Loans and Allowance for Loan Losses, Troubled Debt Restructurings (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Contract
Dec. 31, 2015
USD ($)
Contract
Dec. 31, 2014
USD ($)
Contract
Financing Receivable, Modifications [Line Items]      
TDR's classifications from previously performing loans $ 11,500 $ 10,900  
New York and Other States [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract 43 43 49
Pre-Modification Outstanding Recorded Investment $ 3,718 $ 5,440 $ 6,150
Post-Modification Outstanding Recorded Investment $ 3,718 $ 5,440 $ 6,150
New York and Other States [Member] | Commercial [Member] | Commercial Real Estate [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract 2 0 1
Pre-Modification Outstanding Recorded Investment $ 401 $ 0 $ 294
Post-Modification Outstanding Recorded Investment $ 401 $ 0 $ 294
New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract 30 35 41
Pre-Modification Outstanding Recorded Investment $ 2,871 $ 4,797 $ 5,585
Post-Modification Outstanding Recorded Investment $ 2,871 $ 4,797 $ 5,585
New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract 1 1 4
Pre-Modification Outstanding Recorded Investment $ 44 $ 137 $ 77
Post-Modification Outstanding Recorded Investment $ 44 $ 137 $ 77
New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract 10 7 3
Pre-Modification Outstanding Recorded Investment $ 402 $ 506 $ 194
Post-Modification Outstanding Recorded Investment $ 402 $ 506 $ 194
Florida [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract 6 10 11
Pre-Modification Outstanding Recorded Investment $ 555 $ 887 $ 1,100
Post-Modification Outstanding Recorded Investment $ 555 $ 887 $ 1,100
Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract 4 6 7
Pre-Modification Outstanding Recorded Investment $ 504 $ 780 $ 676
Post-Modification Outstanding Recorded Investment $ 504 $ 780 $ 676
Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract 1 0 1
Pre-Modification Outstanding Recorded Investment $ 45 $ 0 $ 56
Post-Modification Outstanding Recorded Investment $ 45 $ 0 $ 56
Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract 1 4 3
Pre-Modification Outstanding Recorded Investment $ 6 $ 107 $ 368
Post-Modification Outstanding Recorded Investment $ 6 $ 107 $ 368