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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Amortized Cost Basis for Modifications Made to Borrowers Experiencing Financial Difficulty Subsequently Defaulted (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | $ 5,605 | $ 3,288
Principal forgiveness, interest rate reduction, & term extension | 24 | 36
Large Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 4,136 | 2,397
Principal forgiveness, interest rate reduction, & term extension | 20 | 36
Small Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 1,469 | 891
Principal forgiveness, interest rate reduction, & term extension | 4 |
Interest Rate Reduction [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 4,706 | 2,183
Interest Rate Reduction [Member] | Large Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 3,405 | 1,466
Interest Rate Reduction [Member] | Small Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 1,301 | 717
Interest Rate Reduction & Term Extension [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 800 | 961
Interest Rate Reduction & Term Extension [Member] | Large Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 657 | 806
Interest Rate Reduction & Term Extension [Member] | Small Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 143 | 155
Term Extension [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 75 | 108
Term Extension [Member] | Large Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 54 | 89
Term Extension [Member] | Small Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | $ 21 | $ 19

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