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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Amortized Cost	$ 3,156,146	$ 2,956,381
Held to Maturity, Gross Unrealized Gains	30,270	45,556
Held to Maturity, Gross Unrealized Losses	133,504	4,993
Held to Maturity, Estimated Fair Value	3,052,912	2,996,944
Available for Sale, Amortized Cost	5,452,986	5,990,577
Available for Sale, Gross Unrealized Gains	122,936	212,747
Available for Sale, Gross Unrealized Losses	6,131	25
Available for Sale, Estimated Fair Value	5,569,791	6,203,299
U.S. Treasury [Member]
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Amortized Cost	248,488	248,188
Held to Maturity, Gross Unrealized Gains	22,039	29,859
Held to Maturity, Gross Unrealized Losses	0	0
Held to Maturity, Estimated Fair Value	270,527	278,047
Available for Sale, Amortized Cost	2,521,612	3,020,115
Available for Sale, Gross Unrealized Gains	22,449	37,806
Available for Sale, Gross Unrealized Losses	0	0
Available for Sale, Estimated Fair Value	2,544,061	3,057,921
Residential mortgage- backed securities [Member]
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Amortized Cost	9,868	10,725
Held to Maturity, Gross Unrealized Gains	101	300
Held to Maturity, Gross Unrealized Losses	57	0
Held to Maturity, Estimated Fair Value	9,912	11,025
Available for Sale, Amortized Cost	1,828,500	2,382,514
Available for Sale, Gross Unrealized Gains	78,336	135,514
Available for Sale, Gross Unrealized Losses	1,026	25
Available for Sale, Estimated Fair Value	1,905,810	2,518,003
States and political subdivisions [Member]
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Amortized Cost	2,896,790	2,696,468
Held to Maturity, Gross Unrealized Gains	8,130	15,397
Held to Maturity, Gross Unrealized Losses	133,446	4,993
Held to Maturity, Estimated Fair Value	2,771,474	2,706,872
Available for Sale, Amortized Cost	1,066,966	552,056
Available for Sale, Gross Unrealized Gains	22,151	39,427
Available for Sale, Gross Unrealized Losses	5,105	0
Available for Sale, Estimated Fair Value	1,084,012	591,483
Other [Member]
Schedule of Available-for-Sale Securities [Line Items]
Held to Maturity, Amortized Cost	1,000	1,000
Held to Maturity, Gross Unrealized Gains	0	0
Held to Maturity, Gross Unrealized Losses	1	0
Held to Maturity, Estimated Fair Value	999	1,000
Available for Sale, Amortized Cost	35,908	35,892
Available for Sale, Gross Unrealized Gains	0	0
Available for Sale, Gross Unrealized Losses	0	0
Available for Sale, Estimated Fair Value	$ 35,908	$ 35,892

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of investments in debt securities classified as held-to-maturity.

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