Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Business Combination and Asset Purchase - Summary of Carrying Amount of Loans (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Oct. 01, 2021	Apr. 30, 2021
Perpetual Federal Savings Bank [Member]
Business Acquisition [Line Items]
Fair value adjustment	$ 141	$ 190	$ 237
Ossian Financial Services, Inc. [Member]
Business Acquisition [Line Items]
Fair value adjustment	$ 10	$ 321		$ 325