Commitments and Contingencies - Summary of Balance and Activity in Allowance for Credit Losses for Unfunded Loan Commitments (Detail) - Unfunded Commitments [Member]	12 Months Ended
Dec. 31, 2023 USD ($)
Loss Contingencies [Line Items]
Balance, December 31, 2022	$ 141,000
Provision for credit losses	34,000
Balance, December 31, 2023	184,000
Cumulative Effect, Period of Adoption [Member]
Loss Contingencies [Line Items]
Balance, December 31, 2022	$ 9,000

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant