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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Amortized Cost	$ 2,677,485	$ 2,926,486
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	48,581	48,939
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	8,458	9,035
Held to Maturity, Estimated Fair Value	2,717,608	2,966,390
Available for Sale, Amortized Cost	8,765,853	8,261,947
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	216,409	203,121
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	9,574	3,814
Available for Sale, Estimated Fair Value	8,972,688	8,461,254
U.S. Treasury [Member]
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Amortized Cost	249,331	249,009
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	10,904	14,604
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held to Maturity, Estimated Fair Value	260,235	263,613
Available for Sale, Amortized Cost	3,712,808	3,783,899
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	69,579	30,594
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	3,241
Available for Sale, Estimated Fair Value	3,782,387	3,811,252
Residential mortgage-backed securities [Member]
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Amortized Cost	6,723	8,012
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	83	92
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held to Maturity, Estimated Fair Value	6,806	8,104
Available for Sale, Amortized Cost	1,077,507	1,331,114
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	53,490	68,027
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	466	417
Available for Sale, Estimated Fair Value	1,130,531	1,398,724
States and political subdivisions [Member]
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Amortized Cost	2,420,081	2,668,115
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	37,594	34,243
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	8,458	9,035
Held to Maturity, Estimated Fair Value	2,449,217	2,693,323
Available for Sale, Amortized Cost	3,933,101	3,104,563
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	93,340	104,500
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	9,108	156
Available for Sale, Estimated Fair Value	4,017,333	3,208,907
Other [Member]
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Amortized Cost	1,350	1,350
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	0	0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held to Maturity, Estimated Fair Value	1,350	1,350
Available for Sale, Amortized Cost	42,437	42,371
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available for Sale, Estimated Fair Value	$ 42,437	$ 42,371

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