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Disclosures about Fair Value of Financial Instruments - Statement of Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Detail) - Measured at Fair Value on a Recurring Basis: - Significant Unobservable Inputs (Level 3) - Asset-backed securities - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Asset-backed securities
Balance at January 1	$ 34,949	$ 73,266	$ 142,885
Principal payments and premium amortization	(23,867)	(40,041)	(64,181)
Increase in allowance for credit losses	(224)	(1,487)	(1,604)
Decrease in allowance for credit losses	345	1,582	1,026
Change in fair value recognized in OCI	2,033	1,629	(4,860)
Balance at December 31	$ 13,236	$ 34,949	$ 73,266

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Principal Payments

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Decrease In Allowance for Credit Losses

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Increase In Allowance for Credit Losses

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 101
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-101

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Section 50
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- Definition

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 101
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-101

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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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