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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Investment securities available for sale |  |
Cost | $ 6,336,197 | $ 6,885,797
Gross Unrealized Gains | 52,085 | 6,367
Gross Unrealized Losses | 3,467 | 30,871
Fair Value | 6,384,815 | 6,861,293
Investment securities held to maturity |  |
Cost | 125 | 255
U. S. Treasury |  |
Investment securities available for sale |  |
Cost | 1,547,501 | 1,675,996
Gross Unrealized Gains | 2,030 | 4
Gross Unrealized Losses | 1 | 1,118
Fair Value | 1,549,530 | 1,674,882
Government Agency |  |
Investment securities available for sale |  |
Cost | 169,609 | 498,804
Gross Unrealized Gains | 250 | 230
Gross Unrealized Losses | 0 | 374
Fair Value | 169,859 | 498,660
Mortgage Backed Securities |  |
Investment securities available for sale |  |
Cost | 4,487,083 | 4,692,447
Gross Unrealized Gains | 44,570 | 5,120
Gross Unrealized Losses | 3,283 | 29,369
Fair Value | 4,528,370 | 4,668,198
Investment securities held to maturity |  |
Cost | 125 | 255
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 8 | 10
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 0 | 0
Fair Value | 133 | 265
Equity Securities |  |
Investment securities available for sale |  |
Cost | 88,526 | 7,935
Gross Unrealized Gains | 4,653 | 968
Gross Unrealized Losses | 168 | 10
Fair Value | 93,011 | 8,893
Corporate Bonds |  |
Investment securities available for sale |  |
Cost | 41,363 | 8,500
Gross Unrealized Gains | 582 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 41,945 | 8,500
Other Debt Obligations |  |
Investment securities available for sale |  |
Cost | 2,115 | 2,115
Gross Unrealized Gains | 0 | 45
Gross Unrealized Losses | 15 | 0
Fair Value | $ 2,100 | $ 2,160

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