v3.26.1
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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default $ 5,172 $ 3,755 $ 7,095 $ 4,623
Principal forgiveness, interest rate reduction, & term extension 69 63 81 81
Large Loans [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 3,894 2,733 5,380 3,446
Principal forgiveness, interest rate reduction, & term extension 60 63 72 81
Small Loans [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 1,278 1,022 1,715 1,177
Principal forgiveness, interest rate reduction, & term extension 9   9  
Interest Rate Reduction [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 4,334 2,776 6,049 3,373
Interest Rate Reduction [Member] | Large Loans [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 3,186 1,924 4,502 2,396
Interest Rate Reduction [Member] | Small Loans [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 1,148 852 1,547 977
Interest Rate Reduction & Term Extension [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 663 830 847 1,039
Interest Rate Reduction & Term Extension [Member] | Large Loans [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 560 678 709 863
Interest Rate Reduction & Term Extension [Member] | Small Loans [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 103 152 138 176
Term Extension [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 106 86 118 130
Term Extension [Member] | Large Loans [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default 88 68 97 106
Term Extension [Member] | Small Loans [Member]        
Financing Receivable, Modified [Line Items]        
Financial receivable subsequent default $ 18 $ 18 $ 21 $ 24