Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Goodwill and Other Intangible Assets - Additional Information (Detail)		9 Months Ended	12 Months Ended
	Mar. 18, 2016 USD ($) branch	Sep. 30, 2021 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 25, 2022 USD ($)	Oct. 03, 2014 USD ($)
Finite-Lived Intangible Assets [Line Items]
Impairment charges		$ 0	$ 0	$ 0	$ 0
Valley Republic Bancorp
Finite-Lived Intangible Assets [Line Items]
Additions to core deposit intangibles						$ 10,635,000
FNBB
Finite-Lived Intangible Assets [Line Items]
Additions to core deposit intangibles	$ 2,046,000
Bank of America
Finite-Lived Intangible Assets [Line Items]
Additions to core deposit intangibles							$ 6,614,000
Number of branches (in branches) \| branch	3