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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Investment securities available for sale |  |
Cost | $ 6,663,652 | $ 7,163,574
Gross Unrealized Gains | 33,845 | 20,589
Gross Unrealized Losses | 6,919 | 12,246
Fair Value | 6,690,578 | 7,171,917
Investment securities held to maturity |  |
Cost | 301 | 518
U. S. Treasury |  |
Investment securities available for sale |  |
Cost | 1,685,794 | 2,626,900
Gross Unrealized Gains | 5,708 | 2,922
Gross Unrealized Losses | 0 | 152
Fair Value | 1,691,502 | 2,629,670
Government Agency |  |
Investment securities available for sale |  |
Cost | 633,162 | 908,362
Gross Unrealized Gains | 1,742 | 702
Gross Unrealized Losses | 0 | 247
Fair Value | 634,904 | 908,817
Mortgage Backed Securities |  |
Investment securities available for sale |  |
Cost | 4,343,105 | 3,628,187
Gross Unrealized Gains | 26,375 | 16,964
Gross Unrealized Losses | 6,919 | 11,847
Fair Value | 4,362,561 | 3,633,304
Investment securities held to maturity |  |
Cost | 301 | 518
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 13 | 26
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 0 | 0
Fair Value | 314 | 544
Equity Securities |  |
Investment securities available for sale |  |
Cost | 1,591 |
Gross Unrealized Gains | 20 |
Gross Unrealized Losses | 0 |
Fair Value | $ 1,611 |
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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