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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 01, 2017
Mar. 03, 2017
Jul. 15, 2016
May 04, 2016
Jan. 02, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Amortization expense of intangible assets           $ 902 $ 387   $ 2,509 $ 834
Goodwill acquired $ 5,330     $ 4,333 $ 1,693          
Other amortizable intangible assets 271     940 92          
Net increase in goodwill   $ 65,516 $ 1,961              
Net increase in core deposit premiums   $ 8,790 $ 1,170              
Servicing assets               $ 415 1,003  
Additional amortization expense of servicing assets                 $ 112  
Customer Lists [Member]                    
Intangible assets acquired $ 3,644     $ 1,100 $ 591