Loans to Bank Customers - Loan Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 1,809	$ 4,204
Total Current or Less Than 30 Days Past Due	18,312	18,379
Total Outstanding	$ 20,121	$ 22,583
Past Due (as a percent)	9.00%	18.60%
Total Current or Less Than 30 Days Past Due (as a percent)	91.00%	81.40%
Total Outstanding (as a percent)	100.00%	100.00%
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 615	$ 1,082
Past Due (as a percent)	3.10%	4.80%
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 435	$ 939
Past Due (as a percent)	2.20%	4.20%
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 759	$ 2,183
Past Due (as a percent)	3.80%	9.70%
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 125	$ 1
Total Current or Less Than 30 Days Past Due	3,645	4,530
Total Outstanding	3,770	4,531
Residential | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	125	1
Residential | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
Residential | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
Total Current or Less Than 30 Days Past Due	1,074	158
Total Outstanding	1,074	158
Commercial | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
Commercial | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
Commercial | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2	1
Total Current or Less Than 30 Days Past Due	1,215	1,246
Total Outstanding	1,217	1,247
Installment | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	2	1
Installment | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
Installment | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	0	0
Secured credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	1,682	4,202
Total Current or Less Than 30 Days Past Due	12,378	12,445
Total Outstanding	14,060	16,647
Secured credit card | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	488	1,080
Secured credit card | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	435	939
Secured credit card | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due	$ 759	$ 2,183