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Loans and ACL - Additional Information (Detail) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended			12 Months Ended
	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) Loan		Jan. 01, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Loans and lease reserve	$ 49,631	$ 38,567	$ 20,534	$ 38,567	$ 49,631	$ 38,567	$ 20,534	$ 30,740	[1]		$ 17,242	$ 12,121
Charge-offs					12,900
Gross loans	2,445,885				2,445,885			$ 2,412,699
Interest income from nonaccrual loans	0				89
Number of doubtful loans | Loan								0
Loans pledged	2,445,885				2,445,885
Nonperforming trouble debt restructuring								$ 38,300
Amortized Cost of PCD Loans					56,600
Non-Credit Discount on PCD Loans					4,500
Allowance for Loan and Lease Losses, Writeoff	2,581		748		12,910		6,315
Mortgage loans with amortized cost					974			0
Amortized cost of ACL related to PCD loans					556
Cash payments received				4,500
Nonaccrual	77,858				77,858			76,049
January 1, 2023 Post-ASC 326 Adoption [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and lease reserve	7,400				7,400					$ 38,158
Nonaccrual [Member]
Loans and Leases Receivable Disclosure [Line Items]
Amortized Cost Of Loans Modified Nonaccrual Status					48,053
Risk Grade 8
Loans and Leases Receivable Disclosure [Line Items]
Attributable to specific reserve					48,200
Loans pledged	50,989				50,989
Commercial and industrial loan amount					51,000
Collective specific reserve					21,800
Grade 5 Pass/Watch [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans								136,557
Paycheck Protection Plan Liquidity Facility Advances [Member] | Asset Pledged as Collateral without Right [Member] | Federal Home Loan Bank Advances [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	0				0			51
Collateral Pledged [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and lease reserve	9,300				$ 9,300
Minimum [Member] | Grade 5 Pass/Watch [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loan To Value Ratio					90.00%
Commercial Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Attributable to specific reserve		7,000
Commercial and Residential Mortgages [Member] | Asset Pledged as Collateral without Right [Member] | Federal Home Loan Bank Advances [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	765,700				$ 765,700			436,000
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Modified term extension and forbearance amortized cost		32,800			32,750
Loans and lease reserve	41,026	$ 29,864		$ 29,864	41,026	29,864		27,070
Gross loans	532,999				532,999			590,049
Loans pledged	532,999				532,999
Allowance for Loan and Lease Losses, Writeoff	1,832		$ 31		9,927		$ 4,958
Nonaccrual	54,889				54,889			68,039
Commercial and Industrial [Member] | January 1, 2023 Post-ASC 326 Adoption [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and lease reserve	7,400				7,400
Commercial and Industrial [Member] | Nonaccrual [Member]
Loans and Leases Receivable Disclosure [Line Items]
Amortized Cost Of Loans Modified Nonaccrual Status					35,864	$ 32,750
Commercial and Industrial [Member] | Risk Grade 8
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	50,989				50,989
Paycheck Protection Program [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans	6,414				6,414			$ 11,967
Loans pledged	$ 6,414				$ 6,414
[1] Derived from audited December 31, 2022 Consolidated Financial Statements.

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