Revenue from Contracts with Customers (Schedule of Revenue from Contracts with Customers) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Fee revenue and other income:
In-scope of FASB ASC 606 - Invoice processing fees		$ 18,650	$ 20,408	$ 55,697	$ 61,397
In-scope of FASB ASC 606 - Invoice payment fees		5,726	7,333	16,843	19,653
Information services payment and processing revenue		24,376	27,741	72,540	81,050
Bank service fees		441	307	1,249	984
Fee revenue (in-scope of FASB ASC 606)		24,817	28,048	73,789	82,034
Other income (out-of-scope of FASB ASC 606)		115	214	1,412	613
Total fee revenue and other income		24,932	28,262	75,201	82,647
Net interest income after provision for loan losses (out-of-scope of FASB ASC 606)	[1]	10,814	12,274	32,623	35,653
Total net revenue		$ 35,746	$ 40,536	$ 107,824	$ 118,300

[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.