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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, 2025 | Mar. 31, 2024
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | $ 3,288 | $ 2,014
Large Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 2,397 | 1,730
Small Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 891 | 284
Interest Rate Reduction [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 2,183 |
Interest Rate Reduction [Member] | Large Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 1,466 |
Interest Rate Reduction [Member] | Small Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 717 |
Interest Rate Reduction & Term Extension [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 961 | 1,941
Interest Rate Reduction & Term Extension [Member] | Large Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 806 | 1,669
Interest Rate Reduction & Term Extension [Member] | Small Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 155 | 272
Term Extension [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 108 | 53
Term Extension [Member] | Large Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 89 | 47
Term Extension [Member] | Small Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 19 | 6
Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | 36 | 20
Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member] | Large Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default | $ 36 | 14
Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member] | Small Loans [Member] |  |
Financing Receivable, Modified [Line Items] |  |
Financial receivable subsequent default |  | $ 6

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