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Investments (Maturity Information) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities available for sale |  |
Total investment securities available for sale, cost | $ 4,858,178 | $ 7,229,014
Total investment securities available for sale, fair value | 4,783,507 | 7,180,180
Investment securities held to maturity |  |
Investment securities held to maturity | 2,299,774 | 76
Debt Securities |  |
Investment securities available for sale |  |
Maturing in one year or less, cost | 1,255,746 | 808,768
Maturing in one through five years, cost | 252,689 | 849,642
Maturing in five through ten years, cost | 108,649 | 59,414
Maturing in over ten years, cost | 5,545 | 7,645
Maturing in one year or less, fair value | 1,252,487 | 808,301
Maturing in one through five years, fair value | 251,487 | 849,563
Maturing in five through ten yeas, fair value | 108,790 | 59,963
Maturing in over ten years, fair value | 5,643 | 7,719
Mortgage Backed Securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 3,104,316 | 5,419,379
Total investment securities available for sale, fair value | 3,034,065 | 5,340,756
Investment securities held to maturity |  |
Investment securities held to maturity | 2,299,774 | 76
Fair Value | 2,302,093 | 81
Equity Securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 0 | 75,471
Total investment securities available for sale, fair value | $ 0 | $ 105,208

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