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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 04, 2016
Jan. 02, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Amortization expense of intangible assets     $ 387 $ 181 $ 834 $ 541
Goodwill acquired $ 6,013 $ 1,693        
Other amortizable intangible assets 940 92        
Net increase in goodwill     1,851      
Net increase in core deposit premiums     1,170      
Servicing assets     $ 208      
Customer Lists [Member]            
Intangible assets acquired $ 1,100 $ 591