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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Modification Made to Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amortized cost basis | $ 10,836 | $ 8,195 | $ 27,234 | $ 17,194
% of Net finance receivables | 0.50% | 0.50% | 1.30% | 0.90%
Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amortized cost basis | $ 7,905 | $ 4,277 | $ 18,840 | $ 4,903
% of Net finance receivables | 0.30% | 0.20% | 0.90% | 0.30%
Interest Rate Reduction and Term Extension [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amortized cost basis | $ 1,718 | $ 2,496 | $ 6,407 | $ 9,331
% of Net finance receivables | 0.10% | 0.10% | 0.30% | 0.50%
Term Extension [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amortized cost basis | $ 1,060 | $ 1,307 | $ 1,451 | $ 2,552
% of Net finance receivables | 0.10% | 0.10% | 0.10% | 0.10%
Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amortized cost basis | $ 153 | $ 115 | $ 536 | $ 408
Large Loans [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amortized cost basis | $ 8,464 | $ 6,271 | $ 21,410 | $ 13,902
% of Net finance receivables | 0.60% | 0.50% | 1.40% | 1.10%
Large Loans [Member] | Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amortized cost basis | $ 6,011 | $ 2,943 | $ 14,350 | $ 3,435
% of Net finance receivables | 0.40% | 0.20% | 0.90% | 0.30%
Large Loans [Member] | Interest Rate Reduction and Term Extension [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amortized cost basis | $ 1,421 | $ 2,110 | $ 5,331 | $ 8,000
% of Net finance receivables | 0.10% | 0.20% | 0.40% | 0.60%
Large Loans [Member] | Term Extension [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amortized cost basis | $ 885 | $ 1,108 | $ 1,211 | $ 2,082
% of Net finance receivables | 0.10% | 0.10% | 0.10% | 0.20%
Large Loans [Member] | Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amortized cost basis | $ 147 | $ 110 | $ 518 | $ 385
Small Loans [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amortized cost basis | $ 2,372 | $ 1,924 | $ 5,824 | $ 3,292
% of Net finance receivables | 0.40% | 0.40% | 1.10% | 0.60%
Small Loans [Member] | Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amortized cost basis | $ 1,894 | $ 1,334 | $ 4,490 | $ 1,468
% of Net finance receivables | 0.30% | 0.30% | 0.90% | 0.30%
Small Loans [Member] | Interest Rate Reduction and Term Extension [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amortized cost basis | $ 297 | $ 386 | $ 1,076 | $ 1,331
% of Net finance receivables | 0.10% | 0.10% | 0.20% | 0.30%
Small Loans [Member] | Term Extension [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amortized cost basis | $ 175 | $ 199 | $ 240 | $ 470
% of Net finance receivables |  | 0.00% |  | 0.10%
Small Loans [Member] | Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amortized cost basis | $ 6 | $ 5 | $ 18 | $ 23

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