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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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	$ 5,284	$ 2,076	$ 6,818	$ 2,608
Large Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	3,877	1,766	5,117	2,215
Small Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	1,407	310	1,701	393
Interest Rate Reduction [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	4,013	64	5,134	82
Interest Rate Reduction [Member] | Large Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	2,828	53	3,706	71
Interest Rate Reduction [Member] | Small Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	1,185	11	1,428	11
Interest Rate Reduction & Term Extension [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	1,056	1,645	1,394	2,091
Interest Rate Reduction & Term Extension [Member] | Large Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	859	1,417	1,159	1,793
Interest Rate Reduction & Term Extension [Member] | Small Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	197	228	235	298
Term Extension [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	181	345	232	395
Term Extension [Member] | Large Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	159	276	197	317
Term Extension [Member] | Small Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	22	69	35	78
Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	34	22	58	40
Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member] | Large Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	31	20	55	34
Principal Forgiveness, Interest Rate Reduction, & Term Extension [Member] | Small Loans [Member]
Financing Receivable, Modified [Line Items]
Financial receivable subsequent default	$ 3	$ 2	$ 3	$ 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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