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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investment securities available for sale |  |
Investment securities available for sale, cost | $ 9,215,219 | $ 6,911,965
Investment securities available for sale, gross unrealized gains | 45,006 | 111,189
Investment securities available for sale, gross unrealized losses | 56,798 | 8,911
Investment securities available for sale, fair value | 9,203,427 | 7,014,243
Investments in ME securities, cost | 72,894 | 84,837
Investment in marketable equity securities, gross unrealized gains | 24,879 | 8,654
Investment in marketable equity securities, gross unrealized losses | 245 | 1,811
Investment in marketable equity securities, fair value | 97,528 | 91,680
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 3,809,453 | 2,816,982
Investment securities held to maturity, gross unrealied gains | 5,722 | 21,573
Investment securities held to maturity, gross unrealized losses | 55,525 | 56
Investment securities held to maturity, fair value | 3,759,650 | 2,838,499
Total investment securities, cost | 13,097,566 | 9,813,784
Total investment securities, gross unrealized gains | 75,607 | 141,416
Total investment securities, fair value | 112,568 | 10,778
Total investment securities, gross unrealized losses | 13,060,605 | 9,944,422
U. S. Treasury |  |
Investment securities available for sale |  |
Investment securities available for sale, cost | 2,006,788 | 499,832
Investment securities available for sale, gross unrealized gains | 106 | 101
Investment securities available for sale, gross unrealized losses | 1,924 | 0
Investment securities available for sale, fair value | 2,004,970 | 499,933
Government Agency |  |
Investment securities available for sale |  |
Investment securities available for sale, cost | 797,725 | 706,241
Investment securities available for sale, gross unrealized gains | 4,659 | 723
Investment securities available for sale, gross unrealized losses | 3,624 | 5,573
Investment securities available for sale, fair value | 798,760 | 701,391
Residential Mortgage Backed Securities |  |
Investment securities available for sale |  |
Investment securities available for sale, cost | 4,756,977 | 4,369,130
Investment securities available for sale, gross unrealized gains | 8,229 | 70,283
Investment securities available for sale, gross unrealized losses | 36,793 | 1,310
Investment securities available for sale, fair value | 4,728,413 | 4,438,103
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 2,322,529 | 1,877,692
Investment securities held to maturity, gross unrealied gains | 5,690 | 17,689
Investment securities held to maturity, gross unrealized losses | 21,957 | 0
Investment securities held to maturity, fair value | 2,306,262 | 1,895,381
Commercial Mortgage Backed Securities |  |
Investment securities available for sale |  |
Investment securities available for sale, cost | 1,071,309 | 745,892
Investment securities available for sale, gross unrealized gains | 5,364 | 25,645
Investment securities available for sale, gross unrealized losses | 13,924 | 0
Investment securities available for sale, fair value | 1,062,749 | 771,537
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 1,484,916 | 937,034
Investment securities held to maturity, gross unrealied gains | 32 | 3,884
Investment securities held to maturity, gross unrealized losses | 33,568 | 56
Investment securities held to maturity, fair value | 1,451,380 | 940,862
Corporate Bonds |  |
Investment securities available for sale |  |
Investment securities available for sale, cost | 582,420 | 590,870
Investment securities available for sale, gross unrealized gains | 26,648 | 14,437
Investment securities available for sale, gross unrealized losses | 533 | 2,028
Investment securities available for sale, fair value | 608,535 | 603,279
Other Debt Obligations |  |
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 2,008 | 2,256
Investment securities held to maturity, gross unrealied gains | 0 | 0
Investment securities held to maturity, gross unrealized losses | 0 | 0
Investment securities held to maturity, fair value | $ 2,008 | $ 2,256

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