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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Amortized Cost	$ 2,795,676	$ 2,926,486
Held to Maturity, Gross Unrealized Gains	36,913	48,939
Held to Maturity, Gross Unrealized Losses	18,599	9,035
Held to Maturity, Estimated Fair Value	2,813,990	2,966,390
Available for Sale, Amortized Cost	8,523,248	8,261,947
Available for Sale, Gross Unrealized Gains	154,508	203,121
Available for Sale, Gross Unrealized Losses	34,170	3,814
Available for Sale, Estimated Fair Value	8,643,586	8,461,254
U.S. Treasury [Member]
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Amortized Cost	249,222	249,009
Held to Maturity, Gross Unrealized Gains	12,575	14,604
Held to Maturity, Gross Unrealized Losses	0	0
Held to Maturity, Estimated Fair Value	261,797	263,613
Available for Sale, Amortized Cost	3,712,335	3,783,899
Available for Sale, Gross Unrealized Gains	35,008	30,594
Available for Sale, Gross Unrealized Losses	4,794	3,241
Available for Sale, Estimated Fair Value	3,742,549	3,811,252
US Government Corporations and Agencies Securities [Member]
Schedule of Available-for-Sale Securities [Line Items]
Available for Sale, Amortized Cost	10,002	0
Available for Sale, Gross Unrealized Gains	0	0
Available for Sale, Gross Unrealized Losses	0	0
Available for Sale, Estimated Fair Value	10,002	0
Residential mortgage-backed securities [Member]
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Amortized Cost	6,960	8,012
Held to Maturity, Gross Unrealized Gains	60	92
Held to Maturity, Gross Unrealized Losses	10	0
Held to Maturity, Estimated Fair Value	7,010	8,104
Available for Sale, Amortized Cost	1,165,458	1,331,114
Available for Sale, Gross Unrealized Gains	56,322	68,027
Available for Sale, Gross Unrealized Losses	873	417
Available for Sale, Estimated Fair Value	1,220,907	1,398,724
States and political subdivisions [Member]
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Amortized Cost	2,538,144	2,668,115
Held to Maturity, Gross Unrealized Gains	24,278	34,243
Held to Maturity, Gross Unrealized Losses	18,589	9,035
Held to Maturity, Estimated Fair Value	2,543,833	2,693,323
Available for Sale, Amortized Cost	3,593,042	3,104,563
Available for Sale, Gross Unrealized Gains	63,178	104,500
Available for Sale, Gross Unrealized Losses	28,503	156
Available for Sale, Estimated Fair Value	3,627,717	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, Gross Unrealized Gains	0	0
Held to Maturity, Gross Unrealized Losses	0	0
Held to Maturity, Estimated Fair Value	1,350	1,350
Available for Sale, Amortized Cost	42,411	42,371
Available for Sale, Gross Unrealized Gains	0	0
Available for Sale, Gross Unrealized Losses	0	0
Available for Sale, Estimated Fair Value	$ 42,411	$ 42,371

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