Revenue from Contracts with Customers (Schedule of Revenue from Contracts with Customers) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fee revenue and other income:
In-scope of FASB ASC 606 - Invoice processing fees		$ 17,923	$ 20,447	$ 37,047	$ 40,989
In-scope of FASB ASC 606 - Invoice payment fees		4,738	6,405	11,117	12,320
Information services payment and processing revenue		22,661	26,852	48,164	53,309
Bank service fees		398	301	808	677
Fee revenue (in-scope of FASB ASC 606)		23,059	27,153	48,972	53,986
Other income (out-of-scope of FASB ASC 606)		115	219	1,297	399
Total fee revenue and other income		23,174	27,372	50,269	54,385
Net interest income after provision for loan losses (out-of-scope of FASB ASC 606)	[1]	10,761	12,022	21,809	23,379
Total net revenue		$ 33,935	$ 39,394	$ 72,078	$ 77,764

[1] The Company earns interest income from the balances generated during the invoice processing and payment cycle and on deposit accounts, which is an integral component of the Company’s revenue, but, is out-of-scope of FASB ASC 606.