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Loans and ACL - Summary of Amortized Cost of TLMs (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	$ 3,372	$ 9,102		$ 3,801	$ 50,989
Cash payments received					4,500
Extended Maturity and Principal Forgiveness [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	2,150	8,805		2,188	38,958
Commercial and Industrial [Member] | Extended Maturity and Principal Forgiveness [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Modified in Period, Amount	$ 335	$ 5,806	$ 32,800	$ 335	$ 32,750

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Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
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-Topic 310
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-Topic 310
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