Securities - Additional Information (Detail) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025 USD ($) Holding	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) Holding	Dec. 31, 2024 USD ($) Holding
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Maximum percentage of equity of one issuer	10.00%		10.00%
Number of holdings greater than specified percentage of equity \| Holding	0		0	0
Equities securities	$ 29,538		$ 29,538	$ 13,427
Other assets	619,038		619,038	385,390
Proceeds from sale of available-for-sale securities	873,800	$ 0	873,835
Net unrealized losses on available-for-sale securities included in AOCI	178,500		178,500	223,800
Accrued interest receivable	106,410		106,410	78,324
Federal home loan bank stock, Total	82,400		82,400	48,200
Asset Pledged as Security
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Other assets	2,900,000		2,900,000	2,200,000
Us Government Securities and Mortgage Backed and Collateralized Securities Issued By Direct Governmental Entity or Government-Sponsored Entity [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated credit losses			0
Held-to-maturity Securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Accrued interest receivable	8,200		8,200	8,400
Grantor Trusts [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Equities securities	$ 27,000		$ 27,000	$ 10,900

Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at amortized cost (held-to-maturity).

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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