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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Investments [Line Items] |  |
Aggregate fair value, continuous unrealized loss position, 12 months or more | $ 362,351 | $ 280,126
Investment securities available for sale |  |
Cost | 7,079,287 | 6,885,797
Gross Unrealized Gains | 15,324 | 6,367
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 88,031 | 30,871
Fair Value | 7,006,580 | 6,861,293
Investment securities held to maturity |  |
Cost | 98 | 255
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,689 | 6,094
U. S. Treasury |  |
Schedule of Investments [Line Items] |  |
Aggregate fair value, continuous unrealized loss position, 12 months or more | 0 | 0
Investment securities available for sale |  |
Cost | 1,650,675 | 1,675,996
Gross Unrealized Gains | 579 | 4
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 935 | 1,118
Fair Value | 1,650,319 | 1,674,882
Investment securities held to maturity |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Government Agency |  |
Schedule of Investments [Line Items] |  |
Aggregate fair value, continuous unrealized loss position, 12 months or more |  | 0
Investment securities available for sale |  |
Cost | 40,291 | 498,804
Gross Unrealized Gains | 107 | 230
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | 374
Fair Value | 40,398 | 498,660
Investment securities held to maturity |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Mortgage Backed Securities, Other |  |
Schedule of Investments [Line Items] |  |
Aggregate fair value, continuous unrealized loss position, 12 months or more | 362,351 | 280,126
Investment securities available for sale |  |
Cost | 5,259,466 | 4,692,447
Gross Unrealized Gains | 2,809 | 5,120
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 86,850 | 29,369
Fair Value | 5,175,425 | 4,668,198
Investment securities held to maturity |  |
Cost | 98 | 255
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 6 | 10
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 0 | 0
Fair Value | 104 | 265
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,689 | 6,094
Equity Securities |  |
Schedule of Investments [Line Items] |  |
Aggregate fair value, continuous unrealized loss position, 12 months or more |  | 0
Investment securities available for sale |  |
Cost | 71,873 | 7,935
Gross Unrealized Gains | 11,634 | 968
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | 10
Fair Value | 83,507 | 8,893
Investment securities held to maturity |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Corporate Bonds |  |
Investment securities available for sale |  |
Cost | 49,367 | 8,500
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 195 | 0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | 0
Fair Value | 49,562 | 8,500
Other Debt Obligations |  |
Schedule of Investments [Line Items] |  |
Aggregate fair value, continuous unrealized loss position, 12 months or more | 0 |
Investment securities available for sale |  |
Cost | 7,615 | 2,115
Gross Unrealized Gains | 0 | 45
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 246 | 0
Fair Value | 7,369 | $ 2,160
Investment securities held to maturity |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 |

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