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Investments (Maturity Information) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Investment securities held to maturity |  |
Investment securities held to maturity at cost | $ 3,381,078 | $ 2,816,982
Investment securities held to maturity at fair value | 3,353,078 | 2,838,499
Investment securities available for sale at cost | 7,345,143 | 6,911,965
Debt Securities, Available-for-sale | 7,371,129 | 7,014,243
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 1,259 | 1,507
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 1,259 | 1,507
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 749 | 749
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 749 | 749
Debt Securities |  |
Investment securities available for sale |  |
Maturing in one year or less, cost | 1,204 | 500,846
Maturing in one through five years, cost | 37,248 | 72,565
Maturing in five through ten years, cost | 545,754 | 508,320
Maturing in over ten years, cost | 16,700 | 8,971
Maturing in one year or less, fair value | 1,208 | 500,954
Maturing in one through five years, fair value | 38,540 | 73,881
Maturing in five through ten yeas, fair value | 568,692 | 519,570
Maturing in over ten years, fair value | 16,663 | 8,807
Agency Securities |  |
Investment securities held to maturity |  |
Investment securities available for sale at cost | 851,860 | 706,241
Debt Securities, Available-for-sale | 853,728 | 701,391
Residential Mortgage Backed Securities |  |
Investment securities held to maturity |  |
Investment securities held to maturity at cost | 2,122,299 | 1,877,692
Commercial mortgage-backed securities | 2,112,561 | 1,895,381
Investment securities held to maturity at fair value | 2,112,561 | 1,895,381
Investment securities available for sale at cost | 4,800,194 | 4,369,130
Debt Securities, Available-for-sale | 4,801,646 | 4,438,103
Commercial Mortgage Backed Securities |  |
Investment securities held to maturity |  |
Investment securities held to maturity at cost | 1,256,771 | 937,034
Commercial mortgage-backed securities | 1,238,509 | 940,862
Investment securities held to maturity at fair value | 1,238,509 | 940,862
Investment securities available for sale at cost | 1,092,183 | 745,892
Debt Securities, Available-for-sale | $ 1,090,652 | 771,537
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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