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Investments (Maturity Information) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities available for sale |  |
Total investment securities available for sale, cost | $ 4,607,117 | $ 7,229,014
Investment securities available for sale | 4,557,110 | 7,180,180
Investment securities held to maturity |  |
Investment securities held to maturity | 2,184,653 | 76
Debt Securities |  |
Investment securities available for sale |  |
Maturing in one year or less, cost | 1,049,253 | 808,768
Maturing in one through five years, cost | 205,526 | 849,642
Maturing in five through ten years, cost | 134,370 | 59,414
Maturing in over ten years, cost | 3,923 | 7,645
Maturing in one year or less, fair value | 1,047,380 | 808,301
Maturing in one through five years, fair value | 205,805 | 849,563
Maturing in five through ten years, fair value | 133,626 | 59,963
Maturing in over ten years, fair value | 4,125 | 7,719
Equity Securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 0 | 75,471
Investment securities available for sale | 0 | 105,208
Government Agency |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 257,252 | 8,695
Investment securities available for sale | 256,835 | 8,670
Mortgage Backed Securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 2,956,793 | 5,419,379
Investment securities available for sale | 2,909,339 | 5,340,756
Investment securities held to maturity |  |
Investment securities held to maturity | 2,184,653 | 76
Fair Value | $ 2,201,502 | $ 81

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