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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Financial Effects of Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Large Loans [Member] | Interest Rate Reduction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Reduced weighted-average contractual interest | 17.80% | 15.00% | 18.20% | 11.20%
Large Loans [Member] | Term Extension [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Added weighted-average period to loans | 1 year 2 months 12 days | 1 year 2 months 12 days | 1 year 4 months 24 days | 1 year 4 months 24 days
Large Loans [Member] | Principal Forgiveness [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Reduced amortized cost basis | $ 0.3 | $ 0.3 | $ 0.9 | $ 0.9
Small Loans [Member] | Interest Rate Reduction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Reduced weighted-average contractual interest | 28.60% | 26.80% | 29.30% | 22.60%
Small Loans [Member] | Term Extension [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Added weighted-average period to loans | 1 year | 1 year 1 month 6 days | 1 year 3 months 18 days | 1 year 3 months 18 days
Small Loans [Member] | Principal Forgiveness [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Reduced amortized cost basis | $ 0.1 | $ 0.1 | $ 0.3 | $ 0.3

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