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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, 2026	Mar. 31, 2025
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	$ 5,605	$ 3,288
Principal forgiveness, interest rate reduction, & term extension	24	36
Large Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	4,136	2,397
Principal forgiveness, interest rate reduction, & term extension	20	36
Small Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	1,469	891
Principal forgiveness, interest rate reduction, & term extension	4
Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	4,706	2,183
Interest Rate Reduction [Member] | Large Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	3,405	1,466
Interest Rate Reduction [Member] | Small Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	1,301	717
Interest Rate Reduction & Term Extension [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	800	961
Interest Rate Reduction & Term Extension [Member] | Large Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	657	806
Interest Rate Reduction & Term Extension [Member] | Small Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	143	155
Term Extension [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	75	108
Term Extension [Member] | Large Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	54	89
Term Extension [Member] | Small Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	$ 21	$ 19

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