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Securities (Year End Securities with Unrealized Losses Segregated by Length of Impairment) (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | $ 425,896 | $ 149,091
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,596 | 1,342
Held to Maturity, More than 12 Months, Estimated Fair Value | 183,245 | 202,423
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,739 | 4,824
Held to Maturity, Total Estimated Fair Value | 609,141 | 351,514
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 6,335 | 6,166
Available for Sale, Less than 12 Months, Estimated Fair Value | 4,198,655 | 1,028,261
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 108,110 | 9,956
Available for Sale, More than 12 Months, Estimated Fair Value | 6,413 | 36,266
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 262 | 744
Available for Sale, Total Estimated Fair Value | 4,205,068 | 1,064,527
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 108,372 | 10,700
US Treasury Securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Available for Sale, Less than 12 Months, Estimated Fair Value | 1,421,216 | 886,087
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 8,945 | 8,507
Available for Sale, More than 12 Months, Estimated Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Available for Sale, Total Estimated Fair Value | 1,421,216 | 886,087
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 8,945 | 8,507
Residential Mortgage Backed Securities [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value |  | 900
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 4
Held to Maturity, More than 12 Months, Estimated Fair Value |  | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Held to Maturity, Total Estimated Fair Value |  | 900
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 4
Available for Sale, Less than 12 Months, Estimated Fair Value | 81,442 | 21,392
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,031 | 212
Available for Sale, More than 12 Months, Estimated Fair Value | 6,413 | 17,781
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 262 | 522
Available for Sale, Total Estimated Fair Value | 87,855 | 39,173
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,293 | 734
States and Political Subdivisions [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value | 425,896 | 146,854
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,596 | 1,325
Held to Maturity, More than 12 Months, Estimated Fair Value | 183,245 | 202,423
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,739 | 4,824
Held to Maturity, Total Estimated Fair Value | 609,141 | 349,277
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 6,335 | 6,149
Available for Sale, Less than 12 Months, Estimated Fair Value | 2,695,997 | 120,782
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 98,134 | 1,237
Available for Sale, More than 12 Months, Estimated Fair Value | 0 | 18,485
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 222
Available for Sale, Total Estimated Fair Value | 2,695,997 | 139,267
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 98,134 | 1,459
Other Investments [Member] |  |
Schedule of Available-for-Sale Securities [Line Items] |  |
Held to Maturity, Less than 12 Months, Estimated Fair Value |  | 1,337
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 13
Held to Maturity, More than 12 Months, Estimated Fair Value |  | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Held to Maturity, Total Estimated Fair Value |  | 1,337
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 13
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 0 | $ 0

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