Description of Business and Basis of Presentation (Error Correction) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Percent of Fortune 500 Companies Serviced	90.00%
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Changes in finance receivables	$ 31,893	$ 86,135
Net cash from operating activities: continuing operations	216,174	229,589
Net cash from operating activities	216,174	191,166
Purchases of investment securities	(70,896)	(591,304)
Proceeds from sales/maturities of investment securities	78,941	501,459
Net change in short-term and other investing activities	(6,627)	(3,806)
Net investment in loan receivables		(3,806)
Other investing activities	0	9,559
Net cash from investing activities: continuing operations	(110,076)	(113,239)
Net cash from investing activities	(111,686)	(115,741)
Customer deposits at the Bank		19,464
Net cash from financing activities	$ (291,849)	(197,908)
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Changes in finance receivables		85,593
Net cash from operating activities: continuing operations		229,047
Net cash from operating activities		190,624
Purchases of investment securities		(392,427)
Proceeds from sales/maturities of investment securities		241,924
Net change in short-term and other investing activities		68,464
Customer deposits at the Bank		19,464
Other investing activities		(1,511)
Net cash from investing activities: continuing operations		(93,233)
Net cash from investing activities		(95,735)
Net cash from financing activities		(217,372)
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Changes in finance receivables		542
Net cash from operating activities: continuing operations		542
Net cash from operating activities		542
Purchases of investment securities		(198,877)
Proceeds from sales/maturities of investment securities		259,535
Net change in short-term and other investing activities		(68,464)
Net investment in loan receivables		(542)
Customer deposits at the Bank		(19,464)
Other investing activities		7,806
Net cash from investing activities: continuing operations		(20,006)
Net cash from investing activities		(20,006)
Customer deposits at the Bank		19,464
Net cash from financing activities		19,464
Reclass
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net investment in loan receivables		(3,264)
Customer deposits at the Bank		0
Other investing activities		$ 3,264