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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, 2025	Mar. 31, 2024
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	$ 3,288	$ 2,014
Large Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	2,397	1,730
Small Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	891	284
Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	2,183
Interest Rate Reduction [Member] | Large Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	1,466
Interest Rate Reduction [Member] | Small Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	717
Interest Rate Reduction & Term Extension [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	961	1,941
Interest Rate Reduction & Term Extension [Member] | Large Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	806	1,669
Interest Rate Reduction & Term Extension [Member] | Small Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	155	272
Term Extension [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	108	53
Term Extension [Member] | Large Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	89	47
Term Extension [Member] | Small Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	19	6
Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	36	20
Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member] | Large Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	$ 36	14
Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member] | Small Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default		$ 6

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Amortized cost of financing receivable with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty.

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