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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities available for sale |  |
Cost | $ 4,765,832 | $ 7,229,014
Gross Unrealized Gains | 1,502 | 32,094
Gross Unrealized Losses | 89,983 | 80,928
Fair Value | 4,677,351 | 7,180,180
Investment securities held to maturity |  |
Cost | 2,253,416 | 76
U. S. Treasury |  |
Investment securities available for sale |  |
Cost | 1,509,432 | 1,658,410
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 3,998 | 546
Fair Value | 1,505,434 | 1,657,864
Government Agency |  |
Investment securities available for sale |  |
Cost | 127,911 | 8,695
Gross Unrealized Gains | 108 | 15
Gross Unrealized Losses | 474 | 40
Fair Value | 127,545 | 8,670
Mortgage Backed Securities |  |
Investment securities available for sale |  |
Cost | 3,004,219 | 5,419,379
Gross Unrealized Gains | 891 | 1,529
Gross Unrealized Losses | 85,314 | 80,152
Fair Value | 2,919,796 | 5,340,756
Investment securities held to maturity |  |
Cost | 2,253,416 | 76
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 441 | 5
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 15,193 | 0
Fair Value | 2,238,664 | 81
Equity Securities |  |
Investment securities available for sale |  |
Cost | 0 | 75,471
Gross Unrealized Gains |  | 29,737
Gross Unrealized Losses |  | 0
Fair Value | 0 | 105,208
Corporate Bonds |  |
Investment securities available for sale |  |
Cost | 119,717 | 59,414
Gross Unrealized Gains | 413 | 557
Gross Unrealized Losses | 197 | 8
Fair Value | 119,933 | 59,963
Other |  |
Investment securities available for sale |  |
Cost | 4,553 | 7,645
Gross Unrealized Gains | 90 | 256
Gross Unrealized Losses | 0 | 182
Fair Value | $ 4,643 | $ 7,719

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