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Recent Developments, Including Mergers and Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	May 20, 2025	Dec. 31, 2024	Sep. 30, 2024
Business Combination Separately Recognized Transactions [Line Items]
Assets	$ 14,198,140		$ 13,554,314	$ 13,313,482
Loans held for investment (net of unearned interest)	8,278,247		8,025,110	8,180,361
Deposits	$ 12,118,387		$ 11,718,546	$ 11,474,352
American Bank of Oklahoma [Member]
Business Combination Separately Recognized Transactions [Line Items]
Assets		$ 385,000
Loans held for investment (net of unearned interest)		280,000
Deposits		$ 320,000

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