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Fair Value (Narrative) (Details)
 3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
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
Fair value assets and liabilities transfer level 3 to level 1 0   0
Unpaid principal balance of impairment loan at collateral $ 4,714,000   $ 3,036,000
Valuation allowance 33,000   22,000
Fair value option, 90 days or more past due 0   0
Write-downs of impaired collateral-dependent loans 0 $ 0  
Loans 90 days or more past due and still accruing interest  
Fair Value, Inputs, Level 1 [Member] | Financial Instruments Measured At Fair Value On A Non-Recurring Basis [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
Liabilities measured at fair value on a recurring basis 0   0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [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
Liabilities measured at fair value on a recurring basis 0   0
Fair Value, Inputs, Level 2 [Member] | Financial Instruments Measured At Fair Value On A Non-Recurring Basis [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
Liabilities measured at fair value on a recurring basis 0   0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [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
Liabilities measured at fair value on a recurring basis $ 0   $ 0