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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