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Loans and ACL - Summary of Amortized Cost of Collateral Dependent Loans (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Amortized cost of collateral dependent loans	$ 74,141	$ 96,905
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Amortized cost of collateral dependent loans	45,058	67,555
Real Estate [Member] | Construction, commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Amortized cost of collateral dependent loans	1,839	6,309
Real Estate [Member] | Construction, Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Amortized cost of collateral dependent loans	0	2,303
Real Estate [Member] | Commercial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Amortized cost of collateral dependent loans	19,448	13,401
Real Estate [Member] | Residential [Member]
Loans and Leases Receivable Disclosure [Line Items]
Amortized cost of collateral dependent loans	$ 7,796	$ 7,337

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