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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | $ 1,640,255 | $ 2,250,460
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 27,561 | 18,622
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 3,043 | 6,335
Held to Maturity, Estimated Fair Value | 1,664,773 | 2,262,747
Available for Sale, Amortized Cost | 10,581,581 | 10,206,176
Available for Sale, Gross Unrealized Gains | 122,896 | 105,473
Available for Sale, Gross Unrealized Losses | 91,984 | 108,372
Available for Sale, Estimated Fair Value | 10,612,493 | 10,203,277
U.S. 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 | 4,203,543 | 4,003,692
Available for Sale, Gross Unrealized Gains | 25,386 | 24,984
Available for Sale, Gross Unrealized Losses | 7,698 | 8,945
Available for Sale, Estimated Fair Value | 4,221,231 | 4,019,731
Residential mortgage-backed securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 4,313 | 4,511
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 30 | 39
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Held to Maturity, Estimated Fair Value | 4,343 | 4,550
Available for Sale, Amortized Cost | 711,040 | 756,072
Available for Sale, Gross Unrealized Gains | 27,305 | 30,388
Available for Sale, Gross Unrealized Losses | 1,426 | 1,293
Available for Sale, Estimated Fair Value | 736,919 | 785,167
States and political subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 1,634,592 | 1,994,710
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 27,531 | 16,821
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 3,039 | 6,335
Held to Maturity, Estimated Fair Value | 1,659,084 | 2,005,196
Available for Sale, Amortized Cost | 5,624,493 | 5,403,918
Available for Sale, Gross Unrealized Gains | 70,205 | 50,101
Available for Sale, Gross Unrealized Losses | 82,860 | 98,134
Available for Sale, Estimated Fair Value | 5,611,838 | 5,355,885
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 | 4 | 0
Held to Maturity, Estimated Fair Value | 1,346 | 1,350
Available for Sale, Amortized Cost | 42,505 | 42,494
Available for Sale, Gross Unrealized Gains | 0 | 0
Available for Sale, Gross Unrealized Losses | 0 | 0
Available for Sale, Estimated Fair Value | $ 42,505 | $ 42,494

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