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Loans and ACL - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) Loan	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Interest income from nonaccrual loans	$ 122	$ 0	$ 187	$ 89
Current period net charge-offs	12,610	9,020	15,312	10,329
Accrued interest excluded from ACL	12,500		12,500		$ 13,200
Loans pledged	2,258,443		2,258,443		2,430,117
Carrying value after charge off	14,400		14,400
Recorded investment of PCD Loans			49,000		51,000
Recorded investment, estimated allowance for credit loss			486		529
Recorded investment, PCD Discount (Premium)			3,200		3,800
Mortgage loans with amortized cost			$ 710
Number of residential mortgage loans in the process of foreclosure | Loan			5
Default on payments for loans modified			$ 0
Cash payments received			9,000
Loans Held For Sale [Member] | Commercial Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Current period net charge-offs	9,400
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	829,200		829,200		767,100
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Current period net charge-offs	11,982	$ 7,326	13,939	$ 8,125
Loans pledged	401,589		401,589		508,944
Commercial and Industrial [Member] | Asset Pledged as Collateral without Right [Member] | Federal Reserve Bank Borrowings [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans pledged	$ 81,200		$ 81,200		$ 161,000

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