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Securities (Amortized Cost and Estimated Fair Value of Securities Excluding Trading Securities Presented by Contractual Maturity) (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	$ 9,072
Held to Maturity, Due after one year through five years, Amortized Cost	528,192
Held to Maturity, Due after five years through ten years, Amortized Cost	62,934
Held to Maturity, Due after ten years, Amortized Cost	2,933,887
Held to Maturity, Amortized Cost	3,534,085	$ 3,619,738
Held to Maturity, Due in one year or less, Estimated Fair Value	9,067
Held to Maturity, Due after one year through five years, Estimated Fair Value	477,554
Held to Maturity, Due after five years through ten years, Estimated Fair Value	58,653
Held to Maturity, Due after ten years, Estimated Fair Value	2,815,272
Held to Maturity, Estimated Fair Value	3,360,546	3,532,044
Available for Sale, Due in one year or less, Amortized Cost	1,381,425
Available for Sale, Due after one year through five years, Amortized Cost	2,430,874
Available for Sale, Due after five years through ten years, Amortized Cost	1,015,030
Available for Sale, Due after ten years, Amortized Cost	11,731,650
Debt Securities, Available-for-sale, Amortized Cost	16,602,158	17,965,338
Available for Sale, Due in one year or less, Estimated Fair Value	1,373,388
Available for Sale, Due after one year through five years, Estimated Fair Value	2,278,099
Available for Sale, Due after five years through ten years, Estimated Fair Value	942,623
Available for Sale, Due after ten years, Estimated Fair Value	10,406,336
Debt Securities, Available-for-sale	15,043,625	16,578,371
US Treasury [Member]
Schedule of Available-for-Sale Securities [Line Items]
Available for Sale, Due in one year or less, Amortized Cost	1,096,734
Available for Sale, Due after one year through five years, Amortized Cost	2,204,591
Available for Sale, Due after five years through ten years, Amortized Cost	198,105
Available for Sale, Due after ten years, Amortized Cost	192,785
Debt Securities, Available-for-sale, Amortized Cost	3,692,215	5,212,894
Available for Sale, Due in one year or less, Estimated Fair Value	1,088,890
Available for Sale, Due after one year through five years, Estimated Fair Value	2,054,258
Available for Sale, Due after five years through ten years, Estimated Fair Value	165,031
Available for Sale, Due after ten years, Estimated Fair Value	134,141
Debt Securities, Available-for-sale	3,442,320	4,927,589
Residential Mortgage Backed Securities [Member]
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	0
Held to Maturity, Due after one year through five years, Amortized Cost	510,490
Held to Maturity, Due after five years through ten years, Amortized Cost	11,244
Held to Maturity, Due after ten years, Amortized Cost	672,106
Held to Maturity, Amortized Cost	1,193,840	1,250,431
Held to Maturity, Due in one year or less, Estimated Fair Value	0
Held to Maturity, Due after one year through five years, Estimated Fair Value	459,859
Held to Maturity, Due after five years through ten years, Estimated Fair Value	9,164
Held to Maturity, Due after ten years, Estimated Fair Value	653,741
Held to Maturity, Estimated Fair Value	1,122,764	1,196,332
Available for Sale, Due in one year or less, Amortized Cost	39
Available for Sale, Due after one year through five years, Amortized Cost	869
Available for Sale, Due after five years through ten years, Amortized Cost	12,553
Available for Sale, Due after ten years, Amortized Cost	8,011,243
Debt Securities, Available-for-sale, Amortized Cost	8,024,704	7,463,954
Available for Sale, Due in one year or less, Estimated Fair Value	39
Available for Sale, Due after one year through five years, Estimated Fair Value	881
Available for Sale, Due after five years through ten years, Estimated Fair Value	12,588
Available for Sale, Due after ten years, Estimated Fair Value	6,984,394
Debt Securities, Available-for-sale	6,997,902	6,596,682
States and Political Subdivisions [Member]
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	7,572
Held to Maturity, Due after one year through five years, Amortized Cost	17,702
Held to Maturity, Due after five years through ten years, Amortized Cost	51,690
Held to Maturity, Due after ten years, Amortized Cost	2,261,781
Held to Maturity, Amortized Cost	2,338,745	2,367,807
Held to Maturity, Due in one year or less, Estimated Fair Value	7,570
Held to Maturity, Due after one year through five years, Estimated Fair Value	17,695
Held to Maturity, Due after five years through ten years, Estimated Fair Value	49,489
Held to Maturity, Due after ten years, Estimated Fair Value	2,161,531
Held to Maturity, Estimated Fair Value	2,236,285	2,334,257
Available for Sale, Due in one year or less, Amortized Cost	284,652
Available for Sale, Due after one year through five years, Amortized Cost	225,414
Available for Sale, Due after five years through ten years, Amortized Cost	804,372
Available for Sale, Due after ten years, Amortized Cost	3,527,622
Debt Securities, Available-for-sale, Amortized Cost	4,842,060	5,245,721
Available for Sale, Due in one year or less, Estimated Fair Value	284,459
Available for Sale, Due after one year through five years, Estimated Fair Value	222,960
Available for Sale, Due after five years through ten years, Estimated Fair Value	765,004
Available for Sale, Due after ten years, Estimated Fair Value	3,287,801
Debt Securities, Available-for-sale	4,560,224	5,011,331
Other [Member]
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	1,500
Held to Maturity, Due after one year through five years, Amortized Cost	0
Held to Maturity, Due after five years through ten years, Amortized Cost	0
Held to Maturity, Due after ten years, Amortized Cost	0
Held to Maturity, Amortized Cost	1,500	1,500
Held to Maturity, Due in one year or less, Estimated Fair Value	1,497
Held to Maturity, Due after one year through five years, Estimated Fair Value	0
Held to Maturity, Due after five years through ten years, Estimated Fair Value	0
Held to Maturity, Due after ten years, Estimated Fair Value	0
Held to Maturity, Estimated Fair Value	1,497	1,455
Available for Sale, Due in one year or less, Amortized Cost	0
Available for Sale, Due after one year through five years, Amortized Cost	0
Available for Sale, Due after five years through ten years, Amortized Cost	0
Available for Sale, Due after ten years, Amortized Cost	0
Debt Securities, Available-for-sale, Amortized Cost	43,179	42,769
Available for Sale, Due in one year or less, Estimated Fair Value	0
Available for Sale, Due after one year through five years, Estimated Fair Value	0
Available for Sale, Due after five years through ten years, Estimated Fair Value	0
Available for Sale, Due after ten years, Estimated Fair Value	0
Debt Securities, Available-for-sale	$ 43,179	$ 42,769

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