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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Modification Made to Borrowers Experiencing Financial Difficulty (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Modified [Line Items]    
Amortized cost basis $ 10,368 $ 11,090
% of Net finance receivables 0.50% 0.60%
Interest Rate Reduction [Member]    
Financing Receivable, Modified [Line Items]    
Amortized cost basis $ 7,924 $ 7,115
% of Net finance receivables 0.40% 0.40%
Interest Rate Reduction and Term Extension [Member]    
Financing Receivable, Modified [Line Items]    
Amortized cost basis $ 1,753 $ 2,793
% of Net finance receivables 0.10% 0.10%
Term Extension [Member]    
Financing Receivable, Modified [Line Items]    
Amortized cost basis $ 495 $ 997
% of Net finance receivables   0.10%
Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member]    
Financing Receivable, Modified [Line Items]    
Amortized cost basis 196 $ 185
Large Loans [Member]    
Financing Receivable, Modified [Line Items]    
Amortized cost basis $ 7,918 $ 8,583
% of Net finance receivables 0.50% 0.60%
Large Loans [Member] | Interest Rate Reduction [Member]    
Financing Receivable, Modified [Line Items]    
Amortized cost basis $ 5,953 $ 5,239
% of Net finance receivables 0.40% 0.30%
Large Loans [Member] | Interest Rate Reduction and Term Extension [Member]    
Financing Receivable, Modified [Line Items]    
Amortized cost basis $ 1,385 $ 2,317
% of Net finance receivables 0.10% 0.20%
Large Loans [Member] | Term Extension [Member]    
Financing Receivable, Modified [Line Items]    
Amortized cost basis $ 394 $ 852
% of Net finance receivables   0.10%
Large Loans [Member] | Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member]    
Financing Receivable, Modified [Line Items]    
Amortized cost basis 186 $ 175
Small Loans [Member]    
Financing Receivable, Modified [Line Items]    
Amortized cost basis $ 2,450 $ 2,507
% of Net finance receivables 0.50% 0.50%
Small Loans [Member] | Interest Rate Reduction [Member]    
Financing Receivable, Modified [Line Items]    
Amortized cost basis $ 1,971 $ 1,876
% of Net finance receivables 0.40% 0.40%
Small Loans [Member] | Interest Rate Reduction and Term Extension [Member]    
Financing Receivable, Modified [Line Items]    
Amortized cost basis $ 368 $ 476
% of Net finance receivables 0.10% 0.10%
Small Loans [Member] | Term Extension [Member]    
Financing Receivable, Modified [Line Items]    
Amortized cost basis $ 101 $ 145
Small Loans [Member] | Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member]    
Financing Receivable, Modified [Line Items]    
Amortized cost basis $ 10 $ 10