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Securities (Year End Securities Held to Maturity) (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | $ 3,619,738 | $ 2,639,241
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 43,066 | 13,048
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 130,760 | 184,424
Debt Securities, Held to Maturity, Estimated Fair Value | 3,532,044 | 2,467,865
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (310) | (158)
Securities held to maturity, net of allowance for credit losses of $310 in 2023 and $158 in 2022 | 3,619,428 | 2,639,083
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 1,250,431 | 526,122
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 76 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 54,175 | 65,322
Debt Securities, Held to Maturity, Estimated Fair Value | 1,196,332 | 460,800
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 | 0
Securities held to maturity, net of allowance for credit losses of $310 in 2023 and $158 in 2022 | 1,250,431 | 526,122
States and Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 2,367,807 | 2,111,619
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 42,990 | 13,048
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 76,540 | 119,033
Debt Securities, Held to Maturity, Estimated Fair Value | 2,334,257 | 2,005,634
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (310) | (158)
Securities held to maturity, net of allowance for credit losses of $310 in 2023 and $158 in 2022 | 2,367,497 | 2,111,461
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 | 45 | 69
Debt Securities, Held to Maturity, Estimated Fair Value | 1,455 | 1,431
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 | 0
Securities held to maturity, net of allowance for credit losses of $310 in 2023 and $158 in 2022 | $ 1,500 | $ 1,500

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