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Loans and Allowance for Loan Losses, Troubled Debt Restructurings (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Contract
Dec. 31, 2017
USD ($)
Contract
Dec. 31, 2016
USD ($)
Contract
Financing Receivable Modifications Information [Abstract]      
TDR's classifications from previously performing loans $ 11,100 $ 11,800  
New York and Other States [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract [1] 30 69 43
Pre-Modification Outstanding Recorded Investment [1] $ 3,427 $ 7,003 $ 3,718
Post-Modification Outstanding Recorded Investment [1] $ 3,427 $ 7,003 $ 3,718
Florida [Member]      
Modified loans by class determined to be TDR's [Abstract]      
Number of Contracts | Contract 1 12 6
Pre-Modification Outstanding Recorded Investment $ 35 $ 1,171 $ 555
Post-Modification Outstanding Recorded Investment $ 35 $ 1,171 $ 555
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] 6 4 2
Pre-Modification Outstanding Recorded Investment [1] $ 747 $ 426 $ 401
Post-Modification Outstanding Recorded Investment [1] $ 747 $ 426 $ 401
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 44 30
Pre-Modification Outstanding Recorded Investment [1] $ 2,349 $ 5,653 $ 2,871
Post-Modification Outstanding Recorded Investment [1] $ 2,349 $ 5,653 $ 2,871
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 1 10 4
Pre-Modification Outstanding Recorded Investment $ 35 $ 1,076 $ 504
Post-Modification Outstanding Recorded Investment $ 35 $ 1,076 $ 504
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 3 1
Pre-Modification Outstanding Recorded Investment [1] $ 6 $ 56 $ 44
Post-Modification Outstanding Recorded Investment [1] $ 6 $ 56 $ 44
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 1
Pre-Modification Outstanding Recorded Investment $ 0 $ 0 $ 45
Post-Modification Outstanding Recorded Investment $ 0 $ 0 $ 45
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] 5 18 10
Pre-Modification Outstanding Recorded Investment [1] $ 325 $ 868 $ 402
Post-Modification Outstanding Recorded Investment [1] $ 325 $ 868 $ 402
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 2 1
Pre-Modification Outstanding Recorded Investment $ 0 $ 95 $ 6
Post-Modification Outstanding Recorded Investment $ 0 $ 95 $ 6
[1] Includes New York, New Jersey, Vermont and Massachusetts.