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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2017
Sep. 01, 2017
Mar. 03, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Amortization expense of intangible assets       $ 1,656 $ 902 $ 5,073 $ 2,509
Goodwill acquired   $ 5,330          
Other amortizable intangible assets   271          
Net increase in goodwill $ 88,235   $ 65,072        
Intangible asset $ 9,880   $ 8,790        
Additional amortization expense of servicing assets           555 112
Servicing assets           $ 2,755 $ 1,003
Customer Lists [Member]              
Intangible assets acquired   $ 3,644