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Investments (Maturity Information) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investment securities available for sale |  |
Total investment securities available for sale, cost | $ 8,884,548 | $ 7,052,152
Total investment securities available for sale, fair value | 9,019,788 | 7,059,674
Investment securities held to maturity |  |
Investment securities held to maturity at cost | 747,732 | 30,996
Investment securities held to maturity at fair value | 761,252 | 30,996
Investment securities available for sale at cost | 8,884,548 | 7,052,152
Debt Securities, Available-for-sale | 9,019,788 | 7,059,674
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 1,507 | 30,746
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 1,507 | 30,746
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 749 | 250
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 749 | 250
Debt Securities |  |
Investment securities available for sale |  |
Maturing in one year or less, cost | 655,609 | 406,325
Maturing in one through five years, cost | 71,262 | 24,496
Maturing in five through ten years, cost | 456,620 | 185,209
Maturing in over ten years, cost | 14,965 | 109,872
Maturing in one year or less, fair value | 655,779 | 406,927
Maturing in one through five years, fair value | 72,446 | 24,971
Maturing in five through ten yeas, fair value | 461,847 | 187,868
Maturing in over ten years, fair value | 14,897 | 110,026
Agency Securities |  |
Investment securities held to maturity |  |
Investment securities available for sale at cost | 659,260 | 684,085
Debt Securities, Available-for-sale | 654,941 | 682,772
Residential Mortgage Backed Securities |  |
Investment securities held to maturity |  |
Investment securities held to maturity at cost | 614,489 | 0
Commercial mortgage-backed securities | 627,394 | 0
Investment securities held to maturity at fair value | 627,394 |
Investment securities available for sale at cost | 5,968,192 | 5,269,060
Debt Securities, Available-for-sale | 6,069,668 | 5,267,090
Commercial Mortgage Backed Securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 1,058,640 | 373,105
Total investment securities available for sale, fair value | 1,090,210 | 380,020
Investment securities held to maturity |  |
Investment securities held to maturity at cost | 130,987 | 0
Commercial mortgage-backed securities | 131,602 | 0
Investment securities held to maturity at fair value | $ 131,602 |
Residential mortgage-backed securities |  |
Investment securities held to maturity |  |
Investment securities held to maturity at cost |  | 30,996
Investment securities held to maturity at fair value |  | $ 30,996

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