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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | $ 2,368,019 | $ 2,663,009
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 62,105 | 53,842
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 5,090 | 6,166
Held to Maturity, Estimated Fair Value | 2,425,034 | 2,710,685
Available for Sale, Amortized Cost | 8,772,776 | 9,019,570
Available for Sale, Gross Unrealized Gains | 295,545 | 197,488
Available for Sale, Gross Unrealized Losses | 1,092 | 10,700
Available for Sale, Estimated Fair Value | 9,067,229 | 9,206,358
U.S. Treasury [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 249,550 | 249,441
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 6,895 | 7,776
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Held to Maturity, Estimated Fair Value | 256,445 | 257,217
Available for Sale, Amortized Cost | 3,731,803 | 3,980,986
Available for Sale, Gross Unrealized Gains | 93,031 | 22,041
Available for Sale, Gross Unrealized Losses | 0 | 8,507
Available for Sale, Estimated Fair Value | 3,824,834 | 3,994,520
Residential mortgage-backed securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 5,756 | 6,456
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 71 | 63
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 2 | 4
Held to Maturity, Estimated Fair Value | 5,825 | 6,515
Available for Sale, Amortized Cost | 930,927 | 1,000,024
Available for Sale, Gross Unrealized Gains | 45,929 | 42,142
Available for Sale, Gross Unrealized Losses | 216 | 734
Available for Sale, Estimated Fair Value | 976,640 | 1,041,432
States and political subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Amortized Cost | 2,111,363 | 2,405,762
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 55,139 | 46,003
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 5,088 | 6,149
Held to Maturity, Estimated Fair Value | 2,161,414 | 2,445,616
Available for Sale, Amortized Cost | 4,067,577 | 3,996,113
Available for Sale, Gross Unrealized Gains | 156,585 | 133,305
Available for Sale, Gross Unrealized Losses | 876 | 1,459
Available for Sale, Estimated Fair Value | 4,223,286 | 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 | 42,469 | 42,447
Available for Sale, Gross Unrealized Gains | 0 | 0
Available for Sale, Gross Unrealized Losses | 0 | 0
Available for Sale, Estimated Fair Value | $ 42,469 | $ 42,447

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