Intangible Assets - Definite-lived (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 523,888	$ 383,791
Accumulated Amortization	(304,311)	(263,180)
Net Carrying Amount	219,577	120,611
Customer and Bank Branding Contracts / Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	487,509	353,334
Accumulated Amortization	(288,094)	(248,428)
Net Carrying Amount	199,415	104,906
Trade Name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	18,487	11,618
Accumulated Amortization	(5,855)	(3,674)
Net Carrying Amount	12,632	7,944
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,885	10,718
Accumulated Amortization	(4,985)	(4,781)
Net Carrying Amount	5,900	5,937
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,439	4,351
Accumulated Amortization	(4,270)	(4,057)
Net Carrying Amount	169	294
Deferred Financing Costs [Member] | Revolving Credit Facility [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,568	3,770
Accumulated Amortization	(1,107)	(2,240)
Net Carrying Amount	$ 1,461	$ 1,530