Loans and Leases Held for Investment at Amortized Cost, Net of Allowance For Loan and Lease Losses - Loan Modifications (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Combination – Interest Payment Reduction and Term Extension
Financing Receivable, Modified [Line Items]
Total loan modifications	$ 8,526
Percentage of total unsecured personal loans at amortized cost as of end of period	0.20%
Debt Settlement
Financing Receivable, Modified [Line Items]
Total loan modifications	$ 7,350
Percentage of total unsecured personal loans at amortized cost as of end of period	0.20%
Current | Combination – Interest Payment Reduction and Term Extension
Financing Receivable, Modified [Line Items]
Total loan modifications	$ 7,741
Current | Debt Settlement
Financing Receivable, Modified [Line Items]
Total loan modifications	70
30-59 days past due | Combination – Interest Payment Reduction and Term Extension
Financing Receivable, Modified [Line Items]
Total loan modifications	348
30-59 days past due | Debt Settlement
Financing Receivable, Modified [Line Items]
Total loan modifications	85
60-89 days past due | Combination – Interest Payment Reduction and Term Extension
Financing Receivable, Modified [Line Items]
Total loan modifications	172
60-89 days past due | Debt Settlement
Financing Receivable, Modified [Line Items]
Total loan modifications	669
90 or more days past due | Combination – Interest Payment Reduction and Term Extension
Financing Receivable, Modified [Line Items]
Total loan modifications	265
90 or more days past due | Debt Settlement
Financing Receivable, Modified [Line Items]
Total loan modifications	$ 6,526