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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Investment securities available for sale |  |
Cost | $ 7,345,935 | $ 7,163,574
Gross Unrealized Gains | 22,163 | 20,589
Gross Unrealized Losses | 17,904 | 12,246
Fair Value | 7,350,194 | 7,171,917
Investment securities held to maturity |  |
Cost | 351 | 518
U. S. Treasury |  |
Investment securities available for sale |  |
Cost | 2,198,027 | 2,626,900
Gross Unrealized Gains | 8,832 | 2,922
Gross Unrealized Losses | 0 | 152
Fair Value | 2,206,859 | 2,629,670
Government Agency |  |
Investment securities available for sale |  |
Cost | 774,962 | 908,362
Gross Unrealized Gains | 1,667 | 702
Gross Unrealized Losses | 385 | 247
Fair Value | 776,244 | 908,817
Mortgage Backed Securities, Other [Member] |  |
Investment securities available for sale |  |
Cost | 4,372,946 | 3,628,187
Gross Unrealized Gains | 11,664 | 16,964
Gross Unrealized Losses | 17,519 | 11,847
Fair Value | 4,367,091 | 3,633,304
Investment securities held to maturity |  |
Cost | 351 | 518
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 14 | 26
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 0 | 0
Fair Value | $ 365 | 544
State, County and Municipal |  |
Investment securities available for sale |  |
Cost |  | 125
Gross Unrealized Gains |  | 1
Gross Unrealized Losses |  | 0
Fair Value |  | $ 126

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