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Loans and ACL - Summary of Investment of PCI Loans (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
Greater than 90 Days Past Due & Accruing [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	$ 58,394
Greater than 90 Days Past Due & Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	1,481
Greater than 90 Days Past Due & Accruing [Member] | Commercial Construction [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	7
Greater than 90 Days Past Due & Accruing [Member] | Commercial Mortgage [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	51,223
Greater than 90 Days Past Due & Accruing [Member] | Residential Mortgages [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	5,324
Greater than 90 Days Past Due & Accruing [Member] | Consumer Loans [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	359
Current Loans [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	354
Current Loans [Member] | Residential Mortgages [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	354
Total Loan [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	58,748
Total Loan [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	1,481
Total Loan [Member] | Commercial Construction [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	7
Total Loan [Member] | Commercial Mortgage [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	51,223
Total Loan [Member] | Residential Mortgages [Member] | Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	5,678
Total Loan [Member] | Consumer Loans [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	$ 359

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-14

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
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-Name Accounting Standards Codification
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-Paragraph 80
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479294/326-20-55-80

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Amount of increase in financing receivable from purchase. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
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-Publisher FASB
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