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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 01, 2017
Sep. 01, 2017
Mar. 03, 2017
Jul. 15, 2016
May 05, 2016
Jan. 02, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Amortization expense of intangible assets             $ 4,240 $ 1,211 $ 722
Goodwill acquired   $ 5,330     $ 4,333 $ 1,693      
Other amortizable intangible assets   271     940 92      
Net increase in goodwill $ 88,400   $ 65,516 $ 1,961          
Intangible asset $ 9,760   $ 8,790 $ 1,170          
Additional amortization expense of servicing assets             207    
Servicing assets             $ 1,779 $ 415  
Customer Lists [Member]                  
Intangible assets acquired   $ 3,644     $ 1,100 $ 591