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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]      
Valuation allowance $ 276 $ 293  
Investment in historic tax credit 636 452  
Unrecognized tax benefits 0 0 $ 0
Accrued income tax penalties and interest $ 0 $ 0  
State [Member] | New York State Division of Taxation and Finance [Member] | Earliest Tax Year [Member]      
Income Tax Contingency [Line Items]      
Tax years subject to examination 2011    
State [Member] | New York State Division of Taxation and Finance [Member] | Latest Tax Year [Member]      
Income Tax Contingency [Line Items]      
Tax years subject to examination 2015    
Federal [Member] | IRS [Member] | Earliest Tax Year [Member]      
Income Tax Contingency [Line Items]      
Tax years subject to examination 2013    
Federal [Member] | IRS [Member] | Latest Tax Year [Member]      
Income Tax Contingency [Line Items]      
Tax years subject to examination 2015