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Loans and ACL - Additional Information (Detail)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) Loan	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Interest income from nonaccrual loans	$ 275,000	$ 0		$ 463,000	$ 89,000
Current period net charge-offs	7,913,000	2,581,000		23,225,000	12,909,000
Accrued interest excluded from ACL	11,100,000			11,100,000		$ 13,200,000
Loans pledged	2,179,508,000			2,179,508,000		2,430,117,000
Modified term extension and forbearance amortized cost	0			804,000
Financing Receivable, Modified in Period, Amount	3,372,000	9,102,000		3,801,000	50,989,000
Recovery of credit losses	11,330,000	2,045,000		15,185,000	3,279,000
Recorded investment of PCD Loans				48,500,000		51,000,000
Recorded investment, estimated allowance for credit loss				463,000		529,000
Recorded investment, PCD Discount (Premium)				$ 3,000,000		3,800,000
Number of residential mortgage loans in the process of foreclosure | Loan				0
Cash payments received					4,500,000
Unfunded commitments	0			$ 0		0
Extended Maturity and Principal Forgiveness [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	2,150,000	8,805,000		2,188,000	38,958,000
Loans Held For Sale [Member] | Commercial Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Current period net charge-offs				9,400,000
Related Party [Member]
Loans and Leases Receivable Disclosure [Line Items]
Recovery of credit losses	8,400,000
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	802,600			802,600		767,100,000
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Current period net charge-offs	6,001,000	1,832,000		19,940,000	9,927,000
Loans pledged	378,922,000			378,922,000		508,944,000
Modified term extension and forbearance amortized cost	0		$ 0	350,000
Recovery of credit losses	11,095,000	1,596,000		14,455,000	2,327,000
Commercial and Industrial [Member] | Extended Maturity and Principal Forgiveness [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	335,000	$ 5,806,000	$ 32,800,000	335,000	$ 32,750,000
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	$ 69,600			$ 69,600		$ 161,000,000

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