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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable, Modified [Line Items] |  |  |  |
Financial receivable subsequent default | $ 5,284 | $ 2,076 | $ 6,818 | $ 2,608
Large Loans [Member] |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Financial receivable subsequent default | 3,877 | 1,766 | 5,117 | 2,215
Small Loans [Member] |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Financial receivable subsequent default | 1,407 | 310 | 1,701 | 393
Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Financial receivable subsequent default | 4,013 | 64 | 5,134 | 82
Interest Rate Reduction [Member] | Large Loans [Member] |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Financial receivable subsequent default | 2,828 | 53 | 3,706 | 71
Interest Rate Reduction [Member] | Small Loans [Member] |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Financial receivable subsequent default | 1,185 | 11 | 1,428 | 11
Interest Rate Reduction & Term Extension [Member] |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Financial receivable subsequent default | 1,056 | 1,645 | 1,394 | 2,091
Interest Rate Reduction & Term Extension [Member] | Large Loans [Member] |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Financial receivable subsequent default | 859 | 1,417 | 1,159 | 1,793
Interest Rate Reduction & Term Extension [Member] | Small Loans [Member] |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Financial receivable subsequent default | 197 | 228 | 235 | 298
Term Extension [Member] |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Financial receivable subsequent default | 181 | 345 | 232 | 395
Term Extension [Member] | Large Loans [Member] |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Financial receivable subsequent default | 159 | 276 | 197 | 317
Term Extension [Member] | Small Loans [Member] |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Financial receivable subsequent default | 22 | 69 | 35 | 78
Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member] |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Financial receivable subsequent default | 34 | 22 | 58 | 40
Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member] | Large Loans [Member] |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Financial receivable subsequent default | 31 | 20 | 55 | 34
Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member] | Small Loans [Member] |  |  |  |
Financing Receivable, Modified [Line Items] |  |  |  |
Financial receivable subsequent default | $ 3 | $ 2 | $ 3 | $ 6

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