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Fair Value (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]          
Interest rate swap notional amount $ 157,400   $ 157,400   $ 163,900
Unrealized gain on interest rate swap, net of tax $ 89 $ 765 $ 254 $ (2,134)  
Interest Rate Swap [Member]          
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]          
Fixed interest rate 1.4935%   1.4935%    
Fair value of interest rate swap $ 900   $ 900   $ 500
Unrealized gain on interest rate swap     400    
Unrealized gain on interest rate swap, net of tax     $ 300