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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investment securities available for sale |  |
Investment securities available for sale, cost | $ 7,052,152 | $ 4,607,117
Investment securities available for sale, gross unrealized gains | 25,341 | 6,425
Investment securities available for sale, gross unrealized losses | 17,819 | 56,432
Investment securities available for sale, fair value | 7,059,674 | 4,557,110
Investment in marketable equity securities, cost | 59,262 | 73,809
Investment in marketable equity securities, gross unrealized gains | 23,304 | 19,010
Investment in marketable equity securities, gross unrealized losses | 233 | 220
Investment in marketable equity securities, fair value | 82,333 | 92,599
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 30,996 | 2,184,653
Investment securities held to maturity, gross unrealied gains |  | 17,339
Investment securities held to maturity, gross unrealized losses |  | 490
Investment securities held to maturity, fair value | 30,996 | 2,201,502
Total investment securities, cost | 7,142,410 | 6,865,579
Total investment securities, gross unrealized gains | 48,645 | 42,774
Total investment securities, gross unrealized losses | 7,173,003 | 6,851,211
Total investment securities, fair value | 18,052 | 57,142
U. S. Treasury |  |
Investment securities available for sale |  |
Investment securities available for sale, cost | 409,397 | 1,249,243
Investment securities available for sale, gross unrealized gains | 602 | 633
Investment securities available for sale, gross unrealized losses | 0 | 2,166
Investment securities available for sale, fair value | 409,999 | 1,247,710
Government Agency |  |
Investment securities available for sale |  |
Investment securities available for sale, cost | 684,085 | 257,252
Investment securities available for sale, gross unrealized gains | 928 | 222
Investment securities available for sale, gross unrealized losses | 2,241 | 639
Investment securities available for sale, fair value | 682,772 | 256,835
Residential Mortgage Backed Securities |  |
Investment securities available for sale |  |
Investment securities available for sale, cost | 5,269,060 | 2,956,793
Investment securities available for sale, gross unrealized gains | 13,417 | 5,309
Investment securities available for sale, gross unrealized losses | 15,387 | 52,763
Investment securities available for sale, fair value | 5,267,090 | 2,909,339
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 0 | 2,087,024
Investment securities held to maturity, gross unrealied gains |  | 16,592
Investment securities held to maturity, gross unrealized losses |  | 490
Investment securities held to maturity, fair value |  | 2,103,126
Commercial Mortgage Backed Securities |  |
Investment securities available for sale |  |
Investment securities available for sale, cost | 373,105 | 0
Investment securities available for sale, gross unrealized gains | 6,974 |
Investment securities available for sale, gross unrealized losses | 59 |
Investment securities available for sale, fair value | 380,020 | 0
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 0 | 97,629
Investment securities held to maturity, gross unrealied gains |  | 747
Investment securities held to maturity, gross unrealized losses |  | 0
Investment securities held to maturity, fair value |  | 98,376
Corporate Bonds |  |
Investment securities available for sale |  |
Investment securities available for sale, cost | 198,278 | 143,829
Investment securities available for sale, gross unrealized gains | 3,420 | 261
Investment securities available for sale, gross unrealized losses | 132 | 864
Investment securities available for sale, fair value | 201,566 | $ 143,226
US States and Political Subdivisions Debt Securities |  |
Investment securities available for sale |  |
Investment securities available for sale, cost | 118,227 |
Investment securities available for sale, gross unrealized gains | 0 |
Investment securities available for sale, gross unrealized losses | 0 |
Investment securities available for sale, fair value | 118,227 |
Other Debt Obligations |  |
Investment securities held to maturity |  |
Investment securities held to maturity, cost | 30,996 |
Investment securities held to maturity, gross unrealied gains | 0 |
Investment securities held to maturity, gross unrealized losses | 0 |
Investment securities held to maturity, fair value | $ 30,996 |

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