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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2011
--- | --- | --- | ---
Investment securities available for sale |  |  |  |  |  |
Cost | $ 4,606,093 |  | $ 4,029,858 |  | $ 3,982,402 |
Gross Unrealized Gains | 29,721 |  | 28,454 |  | 33,481 |
Gross Unrealized Losses | 1,566 |  | 1,889 |  | 1,642 |
Fair Value | 4,634,248 |  | 4,056,423 |  | 4,014,241 |
Investment securities held to maturity |  |  |  |  |  |
Cost | 1,578 | [1] | 1,822 | [2] | 2,098 | [1]
U. S. Treasury |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 878,692 |  | 887,041 |  | 1,286,978 |
Gross Unrealized Gains | 149 |  | 808 |  | 2,309 |
Gross Unrealized Losses | 156 |  | 30 |  | 5 |
Fair Value | 878,685 |  | 887,819 |  | 1,289,282 |
Government Agency |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 2,976,079 |  | 2,591,974 |  | 1,904,135 |
Gross Unrealized Gains | 2,684 |  | 1,747 |  | 1,848 |
Gross Unrealized Losses | 565 |  | 1,512 |  | 1,140 |
Fair Value | 2,978,198 |  | 2,592,209 |  | 1,904,843 |
Corporate Bonds |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 49,987 |  | 250,476 |  | 461,756 |
Gross Unrealized Gains | 459 |  | 2,344 |  | 5,258 |
Gross Unrealized Losses | 0 |  | 0 |  | 43 |
Fair Value | 50,446 |  | 252,820 |  | 466,971 |
Residential Mortgage-Backed Securities |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 699,468 |  | 298,402 |  | 327,531 |
Gross Unrealized Gains | 9,022 |  | 9,165 |  | 6,403 |
Gross Unrealized Losses | 845 |  | 346 |  | 451 |
Fair Value | 707,645 |  | 307,221 |  | 333,483 |
Investment securities held to maturity |  |  |  |  |  |
Cost | 1,578 |  | 1,822 |  | 2,098 |
Gross Unrealized Gains | 163 |  | 184 |  | 206 |
Gross Unrealized Losses | 27 |  | 26 |  | 26 |
Fair Value | 1,714 |  | 1,980 |  | 2,278 |
Equity Securities |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 841 |  | 939 |  | 965 |
Gross Unrealized Gains | 17,397 |  | 14,374 |  | 17,644 |
Gross Unrealized Losses | 0 |  | 0 |  | 0 |
Fair Value | 18,238 |  | 15,313 |  | 18,609 |
State, County and Municipal |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 1,026 |  | 1,026 |  | 1,037 |
Gross Unrealized Gains | 10 |  | 16 |  | 19 |
Gross Unrealized Losses | 0 |  | 1 |  | 3 |
Fair Value | $ 1,036 |  | $ 1,041 |  | $ 1,053 |
[1] | Unaudited
[2] | Derived from 2011 Annual Report on Form 10-K.

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