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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Securities transactions income tax (benefit) expense	$ 20,000	$ (384,000)	$ 453,000
Federal tax rate, percentage	21.00%	21.00%	21.00%
Recognition of interest and penalties related to unrecognized tax benefits	$ 0	$ 0	$ 0
Minimum [Member]
Income Taxes [Line Items]
Year under examination	2021
Maximum [Member]
Income Taxes [Line Items]
Year under examination	2023

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- Definition

Income tax expense (benefit) on securities transaction.

+ References

No definition available.

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- Definition

Income taxes.

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
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-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Tax year that remains open to examination under enacted tax laws, in YYYY format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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-Name Accounting Standards Codification
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- Definition

Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

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-Topic 740
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