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Securities (Year End Securities Held to Maturity and Available for Sale) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | $ 1,432,098 | $ 2,250,460
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 26,477 | 18,622
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 2,784 | 6,335
Held to Maturity, Estimated Fair Value | 1,455,791 | 2,262,747
Available for Sale, Amortized Cost | 10,329,951 | 10,206,176
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 193,835 | 105,473
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 34,777 | 108,372
Available for Sale, Estimated Fair Value | 10,489,009 | 10,203,277
US Treasury [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 0 | 249,889
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 1,762
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Held to Maturity, Estimated Fair Value | 0 | 251,651
Available for Sale, Amortized Cost | 3,453,391 | 4,003,692
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 7,494 | 24,984
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 15,732 | 8,945
Available for Sale, Estimated Fair Value | 3,445,153 | 4,019,731
Residential Mortgage Backed Securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 3,610 | 4,511
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 15 | 39
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 38 | 0
Held to Maturity, Estimated Fair Value | 3,587 | 4,550
Available for Sale, Amortized Cost | 648,288 | 756,072
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 19,048 | 30,388
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 2,250 | 1,293
Available for Sale, Estimated Fair Value | 665,086 | 785,167
States and Political Subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 1,428,488 | 1,994,710
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 26,462 | 16,821
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 2,746 | 6,335
Held to Maturity, Estimated Fair Value | 1,452,204 | 2,005,196
Available for Sale, Amortized Cost | 6,185,711 | 5,403,918
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 167,293 | 50,101
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 16,795 | 98,134
Available for Sale, Estimated Fair Value | 6,336,209 | 5,355,885
Other [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 0 | 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 | 0 | 1,350
Available for Sale, Amortized Cost | 42,561 | 42,494
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 | $ 42,561 | $ 42,494

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