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Loans and ACL - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) Loan		Mar. 31, 2023 USD ($)	Jan. 01, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Loans and lease reserve	$ 38,567	$ 17,242	$ 38,567	$ 17,242	$ 30,740	[1]	$ 35,961		$ 12,013	$ 12,121
Charge-offs	9,000		10,300
Gross loans	2,454,104		2,454,104		$ 2,412,699
Interest income from nonaccrual loans	0		89
Number of doubtful loans | Loan					0
Loans pledged	2,454,104		2,454,104
Nonperforming trouble debt restructuring					$ 38,300
Amortized Cost of PCD Loans			57,100
Non-Credit Discount on PCD Loans			5,000
Allowance for Loan and Lease Losses, Writeoff	9,020	2,791	10,329	5,567
Mortgage loans with amortized cost			645		0
Amortized cost of ACL related to PCD loans			601
Cash payments received			4,500
Nonaccrual	79,215		79,215		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			42,376
Risk Grade 8
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	5,779		5,779
Commercial and industrial loan amount			5,400
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		51,000
Collateral Pledged [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and lease reserve	3,500		$ 3,500
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	601,900		$ 601,900		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	29,864		29,864		27,070		$ 27,266
Gross loans	541,421		541,421		590,049
Loans pledged	541,421		541,421
Allowance for Loan and Lease Losses, Writeoff	7,326	$ 1,383	8,095	$ 3,746
Nonaccrual	57,348		57,348		68,039
Commercial and Industrial [Member] | Nonaccrual [Member]
Loans and Leases Receivable Disclosure [Line Items]
Amortized Cost Of Loans Modified Nonaccrual Status			32,750
Paycheck Protection Program [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans	7,234		7,234		$ 11,967
Loans pledged	$ 7,234		$ 7,234
[1] Derived from audited December 31, 2022 Consolidated Financial Statements.

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