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Investments (Maturity Information) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investment securities available for sale |  |
Total investment securities available for sale, cost | $ 8,472,398 | $ 7,052,152
Total investment securities available for sale, fair value | 8,619,282 | 7,059,674
Investment securities held to maturity |  |
Investment securities held to maturity at cost | 774,878 | 30,996
Investment securities held to maturity at fair value | 791,325 | 30,996
Investment securities available for sale at cost | 8,472,398 | 7,052,152
Debt Securities, Available-for-sale | 8,619,282 | 7,059,674
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 2,257 | 30,746
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 2,257 | 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 | 754,350 | 406,325
Maturing in one through five years, cost | 51,589 | 24,496
Maturing in five through ten years, cost | 369,075 | 185,209
Maturing in over ten years, cost | 28,959 | 109,872
Maturing in one year or less, fair value | 754,586 | 406,927
Maturing in one through five years, fair value | 51,887 | 24,971
Maturing in five through ten yeas, fair value | 368,281 | 187,868
Maturing in over ten years, fair value | 28,605 | 110,026
Agency Securities |  |
Investment securities held to maturity |  |
Investment securities available for sale at cost | 549,673 | 684,085
Debt Securities, Available-for-sale | 545,709 | 682,772
Residential Mortgage Backed Securities |  |
Investment securities held to maturity |  |
Investment securities held to maturity at cost | 693,143 | 0
Commercial mortgage-backed securities | 709,339 | 0
Investment securities held to maturity at fair value | 709,339 |
Investment securities available for sale at cost | 5,671,151 | 5,269,060
Debt Securities, Available-for-sale | 5,790,392 | 5,267,090
Commercial Mortgage Backed Securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 1,047,601 | 373,105
Total investment securities available for sale, fair value | 1,079,822 | 380,020
Investment securities held to maturity |  |
Investment securities held to maturity at cost | 78,729 | 0
Commercial mortgage-backed securities | 78,980 | 0
Investment securities held to maturity at fair value | $ 78,980 |
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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