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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
--- | --- | --- | ---
Investment securities available for sale |  |  |  |  |  |
Cost | $ 5,247,345 |  | $ 5,192,419 |  | $ 4,434,072 |
Gross Unrealized Gains | 34,137 |  | 34,517 |  | 29,204 |
Gross Unrealized Losses | 1,804 |  | 708 |  | 5,537 |
Fair Value | 5,279,678 |  | 5,226,228 |  | 4,457,739 |
Investment securities held to maturity |  |  |  |  |  |
Cost | 1,229 | [1] | 1,342 | [2] | 1,688 | [1]
U. S. Treasury |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 749,284 |  | 823,241 |  | 1,065,035 |
Gross Unrealized Gains | 474 |  | 403 |  | 306 |
Gross Unrealized Losses | 1 |  | 12 |  | 305 |
Fair Value | 749,757 |  | 823,632 |  | 1,065,036 |
Government Agency |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 3,147,363 |  | 3,052,040 |  | 2,859,197 |
Gross Unrealized Gains | 2,952 |  | 3,501 |  | 1,228 |
Gross Unrealized Losses | 274 |  | 337 |  | 5,040 |
Fair Value | 3,150,041 |  | 3,055,204 |  | 2,855,385 |
Corporate Bonds |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost |  |  |  |  | 225,214 |
Gross Unrealized Gains |  |  |  |  | 1,214 |
Gross Unrealized Losses |  |  |  |  | 0 |
Fair Value |  |  |  |  | 226,428 |
Residential Mortgage-Backed Securities |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 1,348,765 |  | 1,315,211 |  | 282,706 |
Gross Unrealized Gains | 10,849 |  | 14,787 |  | 8,393 |
Gross Unrealized Losses | 1,512 |  | 341 |  | 191 |
Fair Value | 1,358,102 |  | 1,329,657 |  | 290,908 |
Investment securities held to maturity |  |  |  |  |  |
Cost | 1,229 |  | 1,342 |  | 1,688 |
Gross Unrealized Gains | 120 |  | 133 |  | 183 |
Gross Unrealized Losses | 27 |  | 27 |  | 27 |
Fair Value | 1,322 |  | 1,448 |  | 1,844 |
Equity Securities |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 543 |  | 543 |  | 894 |
Gross Unrealized Gains | 19,860 |  | 15,822 |  | 18,049 |
Gross Unrealized Losses | 0 |  | 0 |  | 0 |
Fair Value | 20,403 |  | 16,365 |  | 18,943 |
State, County and Municipal |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 546 |  | 546 |  | 1,026 |
Gross Unrealized Gains | 1 |  | 4 |  | 14 |
Gross Unrealized Losses | 0 |  | 0 |  | 1 |
Fair Value | 547 |  | 550 |  | 1,039 |
Other Debt Obligations |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Cost | 844 |  | 838 |  |  |
Gross Unrealized Gains | 1 |  | 0 |  |  |
Gross Unrealized Losses | 17 |  | 18 |  |  |
Fair Value | $ 828 |  | $ 820 |  |  |
[1] | Unaudited
[2] | Derived from 2012 Annual Report on Form 10-K.

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