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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 01, 2015
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Payment of contingent consideration liability   $ 0 $ 0 $ (1,217) $ 0  
Nonrecurring [Member] | Level 3 [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Allowance For Loan Loss Allocation on Collateral Dependent Impaired Loans   $ 8   $ 8   $ 690
Contingent Consideration [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Earn-out period post acquisition 5 years