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Recent Developments Including Mergers and Acquisitions - Additional Information (Detail) - USD ($)	Jul. 20, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Combination Separately Recognized Transactions [Line Items]
Total assets		$ 13,554,314,000	$ 12,372,042,000	$ 12,387,863,000
Deposits		11,718,546,000	10,700,122,000	10,974,228,000
Goodwill		$ 182,263,000	$ 182,263,000	$ 182,055,000
RCB Bank [Member]
Business Combination Separately Recognized Transactions [Line Items]
Total assets	$ 2,500,000
Loans held for investment (net of unearned interest)	2,100,000
Deposits	10,800,000
Proceeds from acquisition	7,800,000
Intangibles assets, net	252,000
Goodwill	$ 209,000

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