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Securities (Year End Securities Held to Maturity) (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | $ 3,534,085 | $ 3,619,738
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 13,954 | 43,066
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 187,493 | 130,760
Debt Securities, Held to Maturity, Estimated Fair Value | 3,360,546 | 3,532,044
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (310) | (310)
Securities held to maturity, net of allowance for credit losses of $310 at both 2024 and 2023 | 3,533,775 | 3,619,428
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 1,193,840 | 1,250,431
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 76
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 71,076 | 54,175
Debt Securities, Held to Maturity, Estimated Fair Value | 1,122,764 | 1,196,332
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 | 0
Securities held to maturity, net of allowance for credit losses of $310 at both 2024 and 2023 | 1,193,840 | 1,250,431
States and Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 2,338,745 | 2,367,807
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 13,954 | 42,990
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 116,414 | 76,540
Debt Securities, Held to Maturity, Estimated Fair Value | 2,236,285 | 2,334,257
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (310) | (310)
Securities held to maturity, net of allowance for credit losses of $310 at both 2024 and 2023 | 2,338,435 | 2,367,497
Other [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 1,500 | 1,500
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 3 | 45
Debt Securities, Held to Maturity, Estimated Fair Value | 1,497 | 1,455
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 | 0
Securities held to maturity, net of allowance for credit losses of $310 at both 2024 and 2023 | $ 1,500 | $ 1,500

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