Loans and ACL - Summary of Investment of PCI Loans (Detail) - Real Estate [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
30-89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	$ 354
30-89 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0
30-89 Days Past Due [Member] | Commercial Construction [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0
30-89 Days Past Due [Member] | Commercial Mortgage [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0
30-89 Days Past Due [Member] | Residential Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	354
30-89 Days Past Due [Member] | Consumer Loans [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0
Greater than 90 Days Past Due & Accruing [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0
Greater than 90 Days Past Due & Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0
Greater than 90 Days Past Due & Accruing [Member] | Commercial Construction [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0
Greater than 90 Days Past Due & Accruing [Member] | Commercial Mortgage [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0
Greater than 90 Days Past Due & Accruing [Member] | Residential Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0
Greater than 90 Days Past Due & Accruing [Member] | Consumer Loans [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0
Current Loans [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	58,394
Current Loans [Member] | Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	1,481
Current Loans [Member] | Commercial Construction [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	7
Current Loans [Member] | Commercial Mortgage [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	51,223
Current Loans [Member] | Residential Mortgages [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	5,324
Current Loans [Member] | Consumer Loans [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	359
Total Loan [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]
Financing Receivable, Past Due [Line Items]
Purchase loans	7
Total Loan [Member] | Commercial Mortgage [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	51,223
Total Loan [Member] | Residential Mortgages [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