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Fair Value (Narrative) (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value assets and liabilities transfer level 1 to level 3 0   0   0
Fair value assets and liabilities transfer level 3 to level 1 0   0   0
Unpaid principal balance of impairment loan at collateral $ 4,026,000   $ 4,026,000   $ 2,672,000
Valuation allowance 30,000   30,000   21,000
Fair value option, 90 days or more past due 0   0   0
Fair value option, nonaccrual loans 0   0   0
Write-downs of impaired collateral-dependent loans 0 $ 0 0 $ 0  
Loans 90 days or more past due and still accruing interest    
Fair Value, Inputs, Level 1 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets measured at fair value on a recurring basis 0   0   0
Liabilities measured at fair value on a recurring basis 0   0   0
Assets measured at fair value on a nonrecurring basis 0   0   0
Liabilities measured at fair value on a nonrecurring basis 0   0   0
Fair Value, Inputs, Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets measured at fair value on a nonrecurring basis 0   0   0
Liabilities measured at fair value on a nonrecurring basis 0   0   0
Fair Value, Inputs, Level 3 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets measured at fair value on a recurring basis 0   0   0
Liabilities measured at fair value on a recurring basis $ 0   $ 0   $ 0