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Securities (Year End Securities Held to Maturity and Available for Sale) (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | $ 2,250,460 | $ 2,663,009
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 18,622 | 53,842
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 6,335 | 6,166
Held to Maturity, Estimated Fair Value | 2,262,747 | 2,710,685
Available for Sale, Amortized Cost | 10,206,176 | 9,019,570
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 105,473 | 197,488
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 108,372 | 10,700
Available for Sale, Estimated Fair Value | 10,203,277 | 9,206,358
US Treasury [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 249,889 | 249,441
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 1,762 | 7,776
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Held to Maturity, Estimated Fair Value | 251,651 | 257,217
Available for Sale, Amortized Cost | 4,003,692 | 3,980,986
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 24,984 | 22,041
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 8,945 | 8,507
Available for Sale, Estimated Fair Value | 4,019,731 | 3,994,520
Residential Mortgage Backed Securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 4,511 | 6,456
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 39 | 63
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 4
Held to Maturity, Estimated Fair Value | 4,550 | 6,515
Available for Sale, Amortized Cost | 756,072 | 1,000,024
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 30,388 | 42,142
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,293 | 734
Available for Sale, Estimated Fair Value | 785,167 | 1,041,432
States and Political Subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 1,994,710 | 2,405,762
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 16,821 | 46,003
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 6,335 | 6,149
Held to Maturity, Estimated Fair Value | 2,005,196 | 2,445,616
Available for Sale, Amortized Cost | 5,403,918 | 3,996,113
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 50,101 | 133,305
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 98,134 | 1,459
Available for Sale, Estimated Fair Value | 5,355,885 | 4,127,959
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 | 13
Held to Maturity, Estimated Fair Value | 1,350 | 1,337
Available for Sale, Amortized Cost | 42,494 | 42,447
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 | $ 42,494 | $ 42,447

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