Loans and Allowance for Loan Losses - Summary of Company Considers a Loan to Have Defaulted When it Reaches 90 Days Past Due or is Transferred to Nonaccrual (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2021 contract	Dec. 31, 2020 USD ($) contract	Dec. 31, 2019 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts \| contract	0	1	12
Recorded Investment \| $		$ 40	$ 21,933
Commercial and industrial \| Commercial Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts \| contract		0	10
Recorded Investment \| $		$ 0	$ 18,808
Commercial real estate \| Commercial Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts \| contract		0	2
Recorded Investment \| $		$ 0	$ 3,125
Residential real estate \| Residential Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts \| contract		0	0
Recorded Investment \| $		$ 0	$ 0
Consumer home equity \| Consumer Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts \| contract		1	0
Recorded Investment \| $		$ 40	$ 0

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Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524

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Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524

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