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Investments (Maturity Information) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Investment securities available for sale |  |
Total investment securities available for sale, cost | $ 4,898,771 | $ 4,607,117
Total investment securities available for sale, fair value | 4,904,883 | 4,557,110
Investment securities held to maturity |  |
Maturing in one year or less, cost | 30,552 | 0
Maturing in one year or less, fair value | 30,552 | 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 | 2,145,943 | 2,184,653
Fair Value | 2,217,800 | 2,201,502
Debt Securities |  |
Investment securities available for sale |  |
Maturing in one year or less, cost | 748,206 | 1,049,253
Maturing in one through five years, cost | 13,364 | 205,526
Maturing in five through ten years, cost | 137,638 | 134,370
Maturing in over ten years, cost | 3,941 | 3,923
Maturing in one year or less, fair value | 749,318 | 1,047,380
Maturing in one through five years, fair value | 13,795 | 205,805
Maturing in five through ten yeas, fair value | 139,430 | 133,626
Maturing in over ten years, fair value | 4,100 | 4,125
Agency Securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 666,029 | 257,252
Total investment securities available for sale, fair value | 665,621 | 256,835
Mortgage-backed securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 3,329,593 | 2,956,793
Total investment securities available for sale, fair value | 3,332,619 | 2,909,339
Investment securities held to maturity |  |
Investment securities held to maturity | 2,115,141 | 2,184,653
Mortgage-backed securities | 2,186,998 | 2,201,502
Fair Value | $ 2,186,998 | $ 2,201,502

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