Loans Held for Sale - Additional Information (Detail) - USD ($)	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Loans Receivables Held For Sale Net [Abstract]
Loans held for sale	$ 12,229,000	$ 11,965,000	$ 18,815,000
Loans held-for-sale at the lower of cost or fair value	$ 321,000	$ 1,468,000	$ 2,923,000

Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481852/948-310-45-1

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant