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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Investment securities available for sale |  |
Cost | $ 5,680,970 | $ 5,404,335
Gross Unrealized Gains | 29,684 | 28,188
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 34,417 | 44,820
Fair Value | 5,676,237 | 5,387,703
Investment securities held to maturity |  |
Cost | 782 | 907
U. S. Treasury |  |
Investment securities available for sale |  |
Cost | 1,274,716 | 373,223
Gross Unrealized Gains | 379 | 259
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 1,874 | 45
Fair Value | 1,273,221 | 373,437
Government Agency |  |
Investment securities available for sale |  |
Cost | 1,811,889 | 2,543,223
Gross Unrealized Gains | 1,764 | 1,798
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 879 | 792
Fair Value | 1,812,774 | 2,544,229
Mortgage Backed Securities, Other [Member] |  |
Investment securities available for sale |  |
Cost | 2,592,766 | 2,486,297
Gross Unrealized Gains | 5,524 | 4,526
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 31,624 | 43,950
Fair Value | 2,566,666 | 2,446,873
Investment securities held to maturity |  |
Cost | 782 | 907
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 53 | 67
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 0 | 0
Fair Value | 835 | 974
Equity Securities |  |
Investment securities available for sale |  |
Cost | 543 | 543
Gross Unrealized Gains | 22,017 | 21,604
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | 0
Fair Value | 22,560 | 22,147
State, County and Municipal |  |
Investment securities available for sale |  |
Cost | 186 | 186
Gross Unrealized Gains | 0 | 1
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | 0
Fair Value | 186 | 187
Other Debt Obligations |  |
Investment securities available for sale |  |
Cost | 870 | 863
Gross Unrealized Gains | 0 | 0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 40 | 33
Fair Value | $ 830 | $ 830

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