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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
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Mar. 31, 2025 | Mar. 31, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 11,090 | $ 6,101
% of Net finance receivables | 0.60% | 0.30%
Interest Rate Reduction [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 7,115 |
% of Net finance receivables | 0.40% |
Interest Rate Reduction and Term Extension [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 2,793 | $ 4,182
% of Net finance receivables | 0.10% | 0.20%
Term Extension [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 997 | $ 1,764
% of Net finance receivables | 0.10% | 0.10%
Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 185 | $ 155
Large Loans [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 8,583 | $ 5,181
% of Net finance receivables | 0.60% | 0.40%
Large Loans [Member] | Interest Rate Reduction [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 5,239 |
% of Net finance receivables | 0.30% |
Large Loans [Member] | Interest Rate Reduction and Term Extension [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 2,317 | $ 3,545
% of Net finance receivables | 0.20% | 0.30%
Large Loans [Member] | Term Extension [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 852 | $ 1,493
% of Net finance receivables | 0.10% | 0.10%
Large Loans [Member] | Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 175 | $ 143
Small Loans [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 2,507 | $ 920
% of Net finance receivables | 0.50% | 0.20%
Small Loans [Member] | Interest Rate Reduction [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 1,876 |
% of Net finance receivables | 0.40% |
Small Loans [Member] | Interest Rate Reduction and Term Extension [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 476 | $ 637
% of Net finance receivables | 0.10% | 0.10%
Small Loans [Member] | Term Extension [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 145 | $ 271
% of Net finance receivables |  | 0.10%
Small Loans [Member] | Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Amortized cost basis | $ 10 | $ 12

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