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Investments (Maturity Information) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investment securities available for sale |  |
Total investment securities available for sale, cost | $ 7,052,152 | $ 4,607,117
Investment securities available for sale | 7,059,674 | 4,557,110
Investment securities held to maturity |  |
Maturing in one year or less, cost | 30,746 | 0
Maturing in one year or less, fair value | 30,746 | 0
Maturing in one through five years, cost | 250 | 0
Maturing in one through five years, fair value | 250 | 0
Investment securities held to maturity, cost | 30,996 | 2,184,653
Total investment securities held to maturity, fair value | 30,996 | 2,201,502
Debt Securities |  |
Investment securities available for sale |  |
Maturing in one year or less, cost | 406,325 | 1,049,253
Maturing in one through five years, cost | 24,496 | 205,526
Maturing in five through ten years, cost | 185,209 | 134,370
Maturing in over ten years, cost | 109,872 | 3,923
Maturing in one year or less, fair value | 406,927 | 1,047,380
Maturing in one through five years, fair value | 24,971 | 205,805
Maturing in five through ten years, fair value | 187,868 | 133,626
Maturing in over ten years, fair value | 110,026 | 4,125
Government Agency |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 684,085 | 257,252
Investment securities available for sale | 682,772 | 256,835
Residential Mortgage Backed Securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 5,269,060 | 2,956,793
Investment securities available for sale | 5,267,090 | 2,909,339
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 0 | 2,087,024
Investment securities held to maturity, fair value | 0 | 2,103,126
Total investment securities held to maturity, fair value |  | 2,103,126
Commercial Mortgage Backed Securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 373,105 | 0
Investment securities available for sale | 380,020 | 0
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 0 | 97,629
Investment securities held to maturity, fair value | $ 0 | 98,376
Total investment securities held to maturity, fair value |  | $ 98,376

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