Loans to Bank Customers - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Allowance for Loan Losses [Roll Forward]
Balance, beginning of period	$ 1,057	$ 948	$ 1,166	$ 1,144
Provision for loans	62	590	254	1,256
Loans charged off	(634)	(637)	(1,121)	(1,549)
Recoveries of loans previously charged off	85	69	271	119
Balance, end of period	$ 570	$ 970	$ 570	$ 970