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Investments (Maturity Information) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investment securities available for sale |  |
Total investment securities available for sale, cost | $ 7,270,552 | $ 6,911,965
Total investment securities available for sale, fair value | 7,307,122 | 7,014,243
Investment securities held to maturity |  |
Investment securities held to maturity at cost | 2,808,099 | 2,816,982
Investment securities held to maturity at fair value | 2,774,982 | 2,838,499
Investment securities available for sale at cost | 7,270,552 | 6,911,965
Debt Securities, Available-for-sale | 7,307,122 | 7,014,243
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 998 | 1,507
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 998 | 1,507
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 1,009 | 749
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 1,009 | 749
Debt Securities |  |
Investment securities available for sale |  |
Maturing in one year or less, cost | 1,020 | 500,846
Maturing in one through five years, cost | 72,340 | 72,565
Maturing in five through ten years, cost | 502,757 | 508,320
Maturing in over ten years, cost | 8,978 | 8,971
Maturing in one year or less, fair value | 1,021 | 500,954
Maturing in one through five years, fair value | 74,536 | 73,881
Maturing in five through ten yeas, fair value | 517,922 | 519,570
Maturing in over ten years, fair value | 9,381 | 8,807
Agency Securities |  |
Investment securities held to maturity |  |
Investment securities available for sale at cost | 852,305 | 706,241
Debt Securities, Available-for-sale | 846,686 | 701,391
Residential Mortgage Backed Securities |  |
Investment securities held to maturity |  |
Investment securities held to maturity at cost | 1,740,314 | 1,877,692
Commercial mortgage-backed securities | 1,724,995 | 1,895,381
Investment securities held to maturity at fair value | 1,724,995 | 1,895,381
Investment securities available for sale at cost | 4,736,893 | 4,369,130
Debt Securities, Available-for-sale | 4,758,589 | 4,438,103
Commercial Mortgage Backed Securities |  |
Investment securities available for sale |  |
Total investment securities available for sale, cost | 1,096,259 | 745,892
Total investment securities available for sale, fair value | 1,098,987 | 771,537
Investment securities held to maturity |  |
Investment securities held to maturity at cost | 1,065,778 | 937,034
Commercial mortgage-backed securities | 1,047,980 | 940,862
Investment securities held to maturity at fair value | $ 1,047,980 | 940,862
Residential mortgage-backed securities |  |
Investment securities held to maturity |  |
Investment securities held to maturity at cost |  | 2,816,982
Investment securities held to maturity at fair value |  | $ 2,838,499

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