Loans to Bank Customers - Loan Summary (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	$ 50,005	$ 41,917
Total outstanding (as a percent)	100.00%	100.00%
Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	$ 5,434	$ 6,211
Percentage of outstanding (as a percent)	10.90%	14.80%
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	$ 2,274	$ 2,862
Percentage of outstanding (as a percent)	4.60%	6.80%
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	$ 712	$ 774
Percentage of outstanding (as a percent)	1.40%	1.90%
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	$ 2,448	$ 2,575
Percentage of outstanding (as a percent)	4.90%	6.10%
Total Current or Less Than 30 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	$ 44,571	$ 35,706
Total current or less than 30 days past due (as a percent)	89.10%	85.20%
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	$ 5,763	$ 5,095
Residential \| Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	0	0
Residential \| 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	0	0
Residential \| 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	0	0
Residential \| 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	0	0
Residential \| Total Current or Less Than 30 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	5,763	5,095
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	12,811	2,716
Commercial \| Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	0	0
Commercial \| 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	0	0
Commercial \| 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	0	0
Commercial \| 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	0	0
Commercial \| Total Current or Less Than 30 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	12,811	2,716
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	4,270	4,357
Installment \| Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	0	0
Installment \| 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	0	0
Installment \| 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	0	0
Installment \| 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	0	0
Installment \| Total Current or Less Than 30 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	4,270	4,357
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	17,795	20,019
Consumer \| Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	1,543	2,066
Consumer \| 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	1,543	2,066
Consumer \| 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	0	0
Consumer \| 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	0	0
Consumer \| Total Current or Less Than 30 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	16,252	17,953
Secured credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	9,366	9,730
Secured credit card \| Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	3,891	4,145
Secured credit card \| 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	731	796
Secured credit card \| 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	712	774
Secured credit card \| 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	2,448	2,575
Secured credit card \| Total Current or Less Than 30 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Outstanding	$ 5,475	$ 5,585