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Securities - Additional Information (Detail) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 USD ($) Holding | Mar. 31, 2024 USD ($) | 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% |  |
Number of holdings greater than specified percentage of equity | Holding | 0 |  | 0
Equities securities | $ 28,217 |  | $ 13,427
Other assets | 623,182 |  | 385,390
Proceeds from sale of available-for-sale securities | 873,835 | $ 0 |
Net unrealized losses on available-for-sale securities included in AOCI | 195,700 |  | 223,800
Accrued interest receivable | 108,778 |  | 78,324
Federal home loan bank stock, Total | 72,700 |  | 48,200
Asset Pledged as Security |  |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |  |
Other assets | 3,000,000 |  | 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 |  | 8,400
Grantor Trusts [Member] |  |  |
Schedule Of Available For Sale Securities And Held To Maturity [Line Items] |  |  |
Equities securities | $ 25,600 |  | $ 10,900

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