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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Investments [Line Items] |  |
Aggregate fair value, continuous unrealized loss position, 12 months or more | $ 280,126 | $ 832,420
Investment securities available for sale |  |
Cost | 6,885,797 | 7,163,574
Gross Unrealized Gains | 6,367 | 20,589
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 30,871 | 12,246
Fair Value | 6,861,293 | 7,171,917
Investment securities held to maturity |  |
Cost | 255 | 518
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6,094 | 10,043
U. S. Treasury |  |
Schedule of Investments [Line Items] |  |
Aggregate fair value, continuous unrealized loss position, 12 months or more | 0 | 1,015
Investment securities available for sale |  |
Cost | 1,675,996 | 2,626,900
Gross Unrealized Gains | 4 | 2,922
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 1,118 | 152
Fair Value | 1,674,882 | 2,629,670
Investment securities held to maturity |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 1
Government Agency |  |
Schedule of Investments [Line Items] |  |
Aggregate fair value, continuous unrealized loss position, 12 months or more | 0 | 0
Investment securities available for sale |  |
Cost | 498,804 | 908,362
Gross Unrealized Gains | 230 | 702
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 374 | 247
Fair Value | 498,660 | 908,817
Investment securities held to maturity |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Mortgage Backed Securities, Other |  |
Schedule of Investments [Line Items] |  |
Aggregate fair value, continuous unrealized loss position, 12 months or more | 280,126 | 831,405
Investment securities available for sale |  |
Cost | 4,692,447 | 3,628,187
Gross Unrealized Gains | 5,120 | 16,964
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 29,369 | 11,847
Fair Value | 4,668,198 | 3,633,304
Investment securities held to maturity |  |
Cost | 255 | 518
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 10 | 26
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 0 | 0
Fair Value | 265 | 544
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6,094 | 10,042
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 | 7,935 |
Gross Unrealized Gains | 968 |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 10 |
Fair Value | 8,893 |
Investment securities held to maturity |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
State, County and Municipal |  |
Investment securities available for sale |  |
Cost |  | 125
Gross Unrealized Gains |  | 1
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments |  | 0
Fair Value |  | $ 126
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 | 10,615 |
Gross Unrealized Gains | 45 |
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 |
Fair Value | 10,660 |
Investment securities held to maturity |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 0 |

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