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Loans and Allowance for Credit Losses - Additional Information (Detail) $ in Thousands		12 Months Ended
	Jan. 01, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) Loan
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged		$ 2,430,117
Gross loans		2,430,117	$ 2,412,699
Recorded investment of PCD Loans		51,000
Recorded investment, estimated allowance for credit loss		529
Recorded investment, PCD Discount (Premium)	$ 5,600	3,800
Financing receivable, allowance for credit loss, writeoff		31,800
Nonperforming trouble debt restructuring			38,300
Mortgage loans with amortized cost		134	$ 0
Number of doubtful loans \| Loan			0
Accrued interest receivable		14,967	$ 11,569
Accrued interest excluded from ACL		13,200
Interest income from nonaccrual loans		223
Commercial Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Attributable to specific reserve		19,500
Doubtful [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged		37,137
Commercial and industrial loan amount		37,100
Collective specific reserve		9,600
Attributable to specific reserve		34,200
Grade 5 Watch [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans			136,557
Grade 7 Substandard [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged		56,687
Gross loans			86,879
Paycheck Protection Program [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged		2,386
Gross loans		2,386	11,967
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged		506,558
Gross loans		506,558	590,049
Commercial and Industrial [Member] \| Doubtful [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged		37,136
Commercial and Industrial [Member] \| Grade 7 Substandard [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged		15,197
Federal Home Loan Bank Advances [Member] \| Asset Pledged As Collateral Without Right [Member] \| Paycheck Protection Plan Liquidity Facility Advances [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged		0	51
Federal Home Loan Bank Advances [Member] \| Asset Pledged As Collateral Without Right [Member] \| Commercial and Residential Mortgages [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged		767,100	$ 436,000
FRB [Member] \| Asset Pledged As Collateral Without Right [Member] \| Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged		$ 161,000