v3.26.3
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, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default $ 6,324 $ 5,284 $ 9,108 $ 6,818
Principal forgiveness, interest rate reduction, & term extension 18 34 35 58
Large Loans [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 4,870 3,877 7,074 5,117
Principal forgiveness, interest rate reduction, & term extension 15 31 30 55
Small Loans [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 1,454 1,407 2,034 1,701
Principal forgiveness, interest rate reduction, & term extension 3 3 5 3
Interest Rate Reduction [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 5,543 4,013 7,971 5,134
Interest Rate Reduction [Member] | Large Loans [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 4,230 2,828 6,125 3,706
Interest Rate Reduction [Member] | Small Loans [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 1,313 1,185 1,846 1,428
Interest Rate Reduction & Term Extension [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 686 1,056 1,011 1,394
Interest Rate Reduction & Term Extension [Member] | Large Loans [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 553 859 842 1,159
Interest Rate Reduction & Term Extension [Member] | Small Loans [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 133 197 169 235
Term Extension [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 77 181 91 232
Term Extension [Member] | Large Loans [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 72 159 77 197
Term Extension [Member] | Small Loans [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default $ 5 $ 22 $ 14 $ 35