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Investments (Maturity Information) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investment securities available for sale |  |
Total investment securities available for sale, cost | $ 4,611,736 | $ 4,607,117
Total investment securities available for sale, fair value | 4,589,800 | 4,557,110
Investment securities held to maturity |  |
Investment securities held to maturity | 2,214,829 | 2,184,653
Debt Securities |  |
Investment securities available for sale |  |
Maturing in one year or less, cost | 1,046,796 | 1,049,253
Maturing in one through five years, cost | 155,297 | 205,526
Maturing in five through ten years, cost | 137,430 | 134,370
Maturing in over ten years, cost | 3,929 | 3,923
Maturing in one year or less, fair value | 1,046,362 | 1,047,380
Maturing in one through five years, fair value | 155,680 | 205,805
Maturing in five through ten yeas, fair value | 137,162 | 133,626
Maturing in over ten years, fair value | 4,125 | 4,125
Agency Securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 351,284 | 257,252
Total investment securities available for sale, fair value | 350,527 | 256,835
Mortgage Backed Securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 2,917,000 | 2,956,793
Total investment securities available for sale, fair value | 2,895,944 | 2,909,339
Investment securities held to maturity |  |
Investment securities held to maturity | 2,214,829 | 2,184,653
Fair Value | $ 2,254,924 | $ 2,201,502

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