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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 01, 2015
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgage loans held for sale, amortized cost   $ 26,400 $ 29,400
Mortgage loans held for sale, fair value   26,943 29,434
Mortgage loans held for sale difference between fair value and principal amount   543 40
Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgage loans held for sale, fair value   26,943 29,434
Recurring [Member] | Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgage loans held for sale, fair value   0 0
Nonrecurring [Member] | Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Allowance for loan loss on collateral dependent impaired loans   $ 690 $ 469
Contingent Consideration [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Earn-out period post acquisition 5 years    
Contingent Consideration [Member] | Maximum [Member] | Recurring [Member] | Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Discount rate for contingent consideration liability   4.00%