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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 03, 2017
Jul. 15, 2016
May 04, 2016
Jan. 02, 2016
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Amortization expense of intangible assets         $ 576   $ 186
Goodwill acquired     $ 5,553 $ 1,693      
Other amortizable intangible assets     940 92      
Net increase in goodwill $ 67,830 $ 1,961          
Net increase in core deposit premiums $ 8,790 $ 1,170          
Servicing assets         195 $ 415  
Additional amortization expense of servicing assets         $ 31    
Customer Lists [Member]              
Intangible assets acquired     $ 1,100 $ 591