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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 03, 2017
Jul. 15, 2016
May 04, 2016
Jan. 02, 2016
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Amortization expense of intangible assets         $ 1,031   $ 261 $ 1,607 $ 447
Goodwill acquired     $ 4,333 $ 1,693          
Other amortizable intangible assets     940 92          
Net increase in goodwill $ 65,302 $ 1,961              
Net increase in core deposit premiums $ 8,790 $ 1,170              
Servicing assets           $ 415   513  
Additional amortization expense of servicing assets               $ 66  
Customer Lists [Member]                  
Intangible assets acquired     $ 1,100 $ 591