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Loans and ACL - Summary of Modified Loans (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Jun. 30, 2023	Dec. 31, 2023		Mar. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable Disclosure [Line Items]
Recorded Investment	$ 35,009
Allowance for loan losses	35,025		$ 35,893	[1]	$ 35,961	$ 30,740
Cash payments received	1,500
Collateral Pledged
Loans and Leases Receivable Disclosure [Line Items]
Allowance for loan losses	9,600
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Recorded Investment	34,162
Allowance for loan losses	27,065		$ 27,491		$ 27,266	$ 27,070
Term extension and Forbearance [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Recorded Investment	$ 33,979	$ 29,800
[1] Derived from audited December 31, 2023 Consolidated Financial Statements.

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Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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