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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Investment securities available for sale |  |
Cost | $ 6,507,032 | $ 6,885,797
Gross Unrealized Gains | 54,774 | 6,367
Gross Unrealized Losses | 4,226 | 30,871
Fair Value | 6,557,580 | 6,861,293
Investment securities held to maturity |  |
Cost | 156 | 255
U. S. Treasury |  |
Investment securities available for sale |  |
Cost | 1,538,211 | 1,675,996
Gross Unrealized Gains | 3,268 | 4
Gross Unrealized Losses | 0 | 1,118
Fair Value | 1,541,479 | 1,674,882
Government Agency |  |
Investment securities available for sale |  |
Cost | 355,014 | 498,804
Gross Unrealized Gains | 531 | 230
Gross Unrealized Losses | 0 | 374
Fair Value | 355,545 | 498,660
Mortgage Backed Securities |  |
Investment securities available for sale |  |
Cost | 4,489,218 | 4,692,447
Gross Unrealized Gains | 48,888 | 5,120
Gross Unrealized Losses | 2,275 | 29,369
Fair Value | 4,535,831 | 4,668,198
Investment securities held to maturity |  |
Cost | 156 | 255
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 9 | 10
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 0 | 0
Fair Value | 165 | 265
Equity Securities |  |
Investment securities available for sale |  |
Cost | 81,114 | 7,935
Gross Unrealized Gains | 2,062 | 968
Gross Unrealized Losses | 1,786 | 10
Fair Value | 81,390 | 8,893
Corporate Bonds |  |
Investment securities available for sale |  |
Cost | 41,360 | 8,500
Gross Unrealized Gains | 25 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 41,385 | 8,500
Other Debt Obligations |  |
Investment securities available for sale |  |
Cost | 2,115 | 2,115
Gross Unrealized Gains | 0 | 45
Gross Unrealized Losses | 165 | 0
Fair Value | $ 1,950 | $ 2,160

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