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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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