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Revenue from Contracts with Customers (Schedule of Revenue from Contracts with Customers) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fee revenue and other income:                      
In-scope of FASB ASC 606 - Invoice processing fees                 $ 78,461 $ 72,961 $ 67,276
In-scope of FASB ASC 606 - Invoice payment fees                 23,720 20,361 16,437
Information services payment and processing revenue                 102,181 93,322 83,713
Bank service fees                 1,335 1,349 1,276
Fee revenue (in-scope of FASB ASC 606)                 103,516 94,671 84,989
Other income (out-of-scope of FASB ASC 606)                 560 841 1,147
Total fee revenue and other income $ 26,627 $ 26,435 $ 25,640 $ 25,374 $ 24,734 $ 24,207 $ 23,800 $ 22,771 104,076 95,512 86,136
Net interest income after provision for loan losses (out-of-scope of FASB ASC 606)                 44,190 39,790 39,401
Total net revenue                 $ 148,266 $ 135,302 $ 125,537