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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investment securities available for sale |  |
Cost | $ 6,648,389 | $ 6,885,797
Gross Unrealized Gains | 42,666 | 6,367
Gross Unrealized Losses | 3,766 | 30,871
Fair Value | 6,687,289 | 6,861,293
Investment securities held to maturity |  |
Cost | 194 | 255
U. S. Treasury |  |
Investment securities available for sale |  |
Cost | 1,538,907 | 1,675,996
Gross Unrealized Gains | 2,308 | 4
Gross Unrealized Losses | 0 | 1,118
Fair Value | 1,541,215 | 1,674,882
Government Agency |  |
Investment securities available for sale |  |
Cost | 355,488 | 498,804
Gross Unrealized Gains | 669 | 230
Gross Unrealized Losses | 0 | 374
Fair Value | 356,157 | 498,660
Mortgage Backed Securities |  |
Investment securities available for sale |  |
Cost | 4,693,313 | 4,692,447
Gross Unrealized Gains | 37,375 | 5,120
Gross Unrealized Losses | 3,406 | 29,369
Fair Value | 4,727,282 | 4,668,198
Investment securities held to maturity |  |
Cost | 194 | 255
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 9 | 10
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 0 | 0
Fair Value | 203 | 265
Equity Securities |  |
Investment securities available for sale |  |
Cost | 50,066 | 7,935
Gross Unrealized Gains | 2,314 | 968
Gross Unrealized Losses | 285 | 10
Fair Value | 52,095 | 8,893
Other Debt Obligations |  |
Investment securities available for sale |  |
Cost | 10,615 | 10,615
Gross Unrealized Gains | 0 | 45
Gross Unrealized Losses | 75 | 0
Fair Value | $ 10,540 | $ 10,660

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