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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Investment securities available for sale |  |
Cost | $ 5,632,720 | $ 5,404,335
Gross Unrealized Gains | 38,685 | 28,188
Gross Unrealized Losses | 23,311 | 44,820
Fair Value | 5,648,094 | 5,387,703
Investment securities held to maturity |  |
Cost | 607 | 907
U. S. Treasury |  |
Investment securities available for sale |  |
Cost | 1,888,647 | 373,223
Gross Unrealized Gains | 583 | 259
Gross Unrealized Losses | 1,420 | 45
Fair Value | 1,887,810 | 373,437
Government Agency |  |
Investment securities available for sale |  |
Cost | 1,128,752 | 2,543,223
Gross Unrealized Gains | 1,294 | 1,798
Gross Unrealized Losses | 393 | 792
Fair Value | 1,129,653 | 2,544,229
Mortgage Backed Securities, Other [Member] |  |
Investment securities available for sale |  |
Cost | 2,591,641 | 2,486,297
Gross Unrealized Gains | 7,322 | 4,526
Gross Unrealized Losses | 21,498 | 43,950
Fair Value | 2,577,465 | 2,446,873
Investment securities held to maturity |  |
Cost | 607 | 907
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 31 | 67
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 0 | 0
Fair Value | 638 | 974
Equity Securities |  |
Investment securities available for sale |  |
Cost | 543 | 543
Gross Unrealized Gains | 29,485 | 21,604
Gross Unrealized Losses | 0 | 0
Fair Value | 30,028 | 22,147
Equity Securities | Bancorporation |  |
Investment securities available for sale |  |
Fair Value | 29,600 |
State, County and Municipal |  |
Investment securities available for sale |  |
Cost | 125 | 186
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | 0 | 0
Fair Value | 126 | 187
Other Debt Obligations |  |
Investment securities available for sale |  |
Cost | 23,012 | 863
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 33
Fair Value | $ 23,012 | $ 830

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