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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
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Amortization expense of intangible assets       $ 6,763 $ 4,240 $ 1,211
Net increase in goodwill $ 88,677 $ 5,330 $ 66,540      
Intangible asset $ 9,880 271 $ 8,790      
Additional amortization expense of servicing assets       846 207  
Servicing assets added during the period       $ 3,278 $ 1,779  
Customer Lists [Member]            
Intangible assets acquired   $ 3,644