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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	$ 429,868
Held to Maturity, Due after one year through five years, Amortized Cost	120,016
Held to Maturity, Due after five years through ten years, Amortized Cost	571,577
Held to Maturity, Due after ten years, Amortized Cost	544,162
Held to Maturity, Amortized Cost	1,665,623	$ 1,749,337
Held to Maturity, Due in one year or less, Estimated Fair Value	431,977
Held to Maturity, Due after one year through five years, Estimated Fair Value	121,182
Held to Maturity, Due after five years through ten years, Estimated Fair Value	555,051
Held to Maturity, Due after ten years, Estimated Fair Value	531,783
Held to Maturity, Estimated Fair Value	1,639,993	1,809,143
Available-for-sale Securities, Due in one year or less, Amortized Cost	194,518
Available for Sale, Due after one year through five years, Amortized Cost	3,610,741
Available for Sale, Due after five years through ten years, Amortized Cost	2,340,280
Available for Sale, Due after ten years, Amortized Cost	10,428,694
Debt Securities, Available-for-sale, Amortized Cost	16,616,594	13,445,888
Available for Sale, Due in one year or less, Estimated Fair Value	197,334
Available for Sale, Due after one year through five years, Estimated Fair Value	3,596,062
Available for Sale, Due after five years through ten years, Estimated Fair Value	2,269,482
Available for Sale, Due after ten years, Estimated Fair Value	10,079,300
Securities available for sale, at estimated fair value	16,184,539	13,924,628
US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Due in one year or less, Amortized Cost	0
Available for Sale, Due after one year through five years, Amortized Cost	2,033,995
Available for Sale, Due after five years through ten years, Amortized Cost	1,432,731
Available for Sale, Due after ten years, Amortized Cost	191,780
Debt Securities, Available-for-sale, Amortized Cost	3,658,506	2,165,702
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	1,978,865
Available for Sale, Due after five years through ten years, Estimated Fair Value	1,350,553
Available for Sale, Due after ten years, Estimated Fair Value	178,328
Securities available for sale, at estimated fair value	3,507,746	2,179,433
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	16
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	514,842
Held to Maturity, Due after ten years, Amortized Cost	12,111
Held to Maturity, Amortized Cost	526,969	527,264
Held to Maturity, Due in one year or less, Estimated Fair Value	16
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	498,078
Held to Maturity, Due after ten years, Estimated Fair Value	11,356
Held to Maturity, Estimated Fair Value	509,450	546,030
Available-for-sale Securities, Due in one year or less, Amortized Cost	102
Available for Sale, Due after one year through five years, Amortized Cost	12,917
Available for Sale, Due after five years through ten years, Amortized Cost	19,060
Available for Sale, Due after ten years, Amortized Cost	5,664,827
Debt Securities, Available-for-sale, Amortized Cost	5,696,906	4,059,692
Available for Sale, Due in one year or less, Estimated Fair Value	103
Available for Sale, Due after one year through five years, Estimated Fair Value	13,212
Available for Sale, Due after five years through ten years, Estimated Fair Value	19,327
Available for Sale, Due after ten years, Estimated Fair Value	5,343,397
Securities available for sale, at estimated fair value	5,376,039	4,066,265
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Held to Maturity, Due in one year or less, Amortized Cost	429,852
Held to Maturity, Due after one year through five years, Amortized Cost	118,516
Held to Maturity, Due after five years through ten years, Amortized Cost	56,735
Held to Maturity, Due after ten years, Amortized Cost	532,051
Held to Maturity, Amortized Cost	1,137,154	1,220,573
Held to Maturity, Due in one year or less, Estimated Fair Value	431,961
Held to Maturity, Due after one year through five years, Estimated Fair Value	119,698
Held to Maturity, Due after five years through ten years, Estimated Fair Value	56,973
Held to Maturity, Due after ten years, Estimated Fair Value	520,427
Held to Maturity, Estimated Fair Value	1,129,059	1,261,613
Available-for-sale Securities, Due in one year or less, Amortized Cost	194,416
Available for Sale, Due after one year through five years, Amortized Cost	1,563,829
Available for Sale, Due after five years through ten years, Amortized Cost	888,489
Available for Sale, Due after ten years, Amortized Cost	4,572,087
Debt Securities, Available-for-sale, Amortized Cost	7,218,821	7,178,135
Available for Sale, Due in one year or less, Estimated Fair Value	197,231
Available for Sale, Due after one year through five years, Estimated Fair Value	1,603,985
Available for Sale, Due after five years through ten years, Estimated Fair Value	899,602
Available for Sale, Due after ten years, Estimated Fair Value	4,557,575
Securities available for sale, at estimated fair value	7,258,393	7,636,571
Other Investments [Member]
Schedule of Investments [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	1,500
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	0
Held to Maturity, Due after one year through five years, Estimated Fair Value	1,484
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	1,484	1,500
Available-for-sale Securities, 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	42,361	42,359
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
Securities available for sale, at estimated fair value	$ 42,361	$ 42,359

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