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Business - Additional Information (Detail) $ in Millions	Dec. 31, 2020 Location Subsidiary loan	Aug. 10, 2018 USD ($)
Schedule Of Description Of Company [Line Items]
Number of inactive subsidiaries | Subsidiary	1
Bank operated banking centers	57
Bank operated trust office locations, number	3
Number of loan production office | loan	1
Community Bank [Member]
Schedule Of Description Of Company [Line Items]
Bank operated banking centers		16
Total assets | $		$ 4,090

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Bank operated wealth management offices, number.

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Amount of assets acquired at the acquisition date.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472

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