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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011
--- | --- | --- | ---
Investment securities available for sale |  |  |  |  |  |
Cost | $ 4,969,135 |  | $ 4,029,858 |  | $ 3,965,995 |
Gross Unrealized Gains | 43,347 |  | 28,454 |  | 31,463 |
Gross Unrealized Losses | 441 |  | 1,889 |  | 2,633 |
Fair Value | 5,012,041 |  | 4,056,423 |  | 3,994,825 |
Investment securities held to maturity |  |  |  |  |  |
Cost | 1,459 | [1] | 1,822 | [2] | 1,943 | [1]
U. S. Treasury |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 872,411 |  | 887,041 |  | 986,507 |
Gross Unrealized Gains | 409 |  | 808 |  | 1,427 |
Gross Unrealized Losses | 30 |  | 30 |  | 0 |
Fair Value | 872,790 |  | 887,819 |  | 987,934 |
Government Agency |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 2,656,974 |  | 2,591,974 |  | 2,261,000 |
Gross Unrealized Gains | 3,851 |  | 1,747 |  | 2,344 |
Gross Unrealized Losses | 78 |  | 1,512 |  | 2,435 |
Fair Value | 2,660,747 |  | 2,592,209 |  | 2,260,909 |
Corporate Bonds |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 50,826 |  | 250,476 |  | 401,048 |
Gross Unrealized Gains | 243 |  | 2,344 |  | 3,595 |
Gross Unrealized Losses | 0 |  | 0 |  | 0 |
Fair Value | 51,069 |  | 252,820 |  | 404,643 |
Residential Mortgage-Backed Securities |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 1,387,482 |  | 298,402 |  | 315,474 |
Gross Unrealized Gains | 20,622 |  | 9,165 |  | 8,916 |
Gross Unrealized Losses | 333 |  | 346 |  | 198 |
Fair Value | 1,407,771 |  | 307,221 |  | 324,192 |
Investment securities held to maturity |  |  |  |  |  |
Cost | 1,459 |  | 1,822 |  | 1,943 |
Gross Unrealized Gains | 151 |  | 184 |  | 191 |
Gross Unrealized Losses | 27 |  | 26 |  | 26 |
Fair Value | 1,583 |  | 1,980 |  | 2,108 |
Equity Securities |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 841 |  | 939 |  | 939 |
Gross Unrealized Gains | 18,215 |  | 14,374 |  | 15,165 |
Gross Unrealized Losses | 0 |  | 0 |  | 0 |
Fair Value | 19,056 |  | 15,313 |  | 16,104 |
State, County and Municipal |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 601 |  | 1,026 |  | 1,027 |
Gross Unrealized Gains | 7 |  | 16 |  | 16 |
Gross Unrealized Losses | 0 |  | 1 |  | 0 |
Fair Value | $ 608 |  | $ 1,041 |  | $ 1,043 |
[1] | Unaudited
[2] | Derived from 2011 Annual Report on Form 10-K.

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