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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
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Mar. 31, 2026 | Mar. 31, 2025
Large Loans [Member] | Interest Rate Reduction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Reduced weighted-average contractual interest | 18.10% | 18.40%
Large Loans [Member] | Term Extension [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Added weighted-average period to loans | 1 year 3 months 18 days | 1 year 3 months 18 days
Large Loans [Member] | Principal Forgiveness [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Reduced amortized cost basis | $ 0.4 | $ 0.3
Small Loans [Member] | Interest Rate Reduction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Reduced weighted-average contractual interest | 28.40% | 29.10%
Small Loans [Member] | Term Extension [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Added weighted-average period to loans | 1 year 3 months 18 days | 1 year 2 months 12 days
Small Loans [Member] | Principal Forgiveness [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Reduced amortized cost basis | $ 0.2 | $ 0.1

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