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Investment Securities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Debt securities weighted average remaining contractual maturity term	25 years
Total deposits	$ 11,989,921	$ 11,948,381
Debt Securities, Held-to-Maturity, Allowance for Credit Loss	$ 0	0
United States [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities issued by U.S. government percentage	90.00%
Investment Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Secured unused borrowing capacity	$ 1,620,000
Secure Public Funds	310,000	315
Pledged To Secure Unused Borrowing Capacity		1,630,000
Total deposits	1,140,000	1,180,000
Pledged To Secure	$ 2,710,000	$ 2,790,000

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