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Investments (Maturity Information) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investment securities available for sale |  |
Total investment securities available for sale, cost | $ 6,911,965 | $ 7,052,152
Investment securities available for sale | 7,014,243 | 7,059,674
Investment securities held to maturity |  |
Maturing in one year or less, cost | 1,507 | 30,746
Maturing in one year or less, fair value | 1,507 | 30,746
Maturing in one through five years, cost | 749 | 250
Maturing in one through five years, fair value | 749 | 250
Investment securities held to maturity, cost | 2,816,982 | 30,996
Total investment securities held to maturity, fair value | 2,838,499 | 30,996
Debt Securities |  |
Investment securities available for sale |  |
Maturing in one year or less, cost | 500,846 | 406,325
Maturing in one through five years, cost | 72,565 | 24,496
Maturing in five through ten years, cost | 508,320 | 185,209
Maturing in over ten years, cost | 8,971 | 109,872
Maturing in one year or less, fair value | 500,954 | 406,927
Maturing in one through five years, fair value | 73,881 | 24,971
Maturing in five through ten years, fair value | 519,570 | 187,868
Maturing in over ten years, fair value | 8,807 | 110,026
Government Agency |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 706,241 | 684,085
Investment securities available for sale | 701,391 | 682,772
Residential Mortgage Backed Securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 4,369,130 | 5,269,060
Investment securities available for sale | 4,438,103 | 5,267,090
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 1,877,692 | 0
Investment securities held to maturity, fair value | 1,895,381 | 0
Total investment securities held to maturity, fair value | 1,895,381 |
Commercial Mortgage Backed Securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 745,892 | 373,105
Investment securities available for sale | 771,537 | 380,020
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 937,034 | 0
Investment securities held to maturity, fair value | 940,862 | $ 0
Total investment securities held to maturity, fair value | $ 940,862 |

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