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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities available for sale |  |
Cost | $ 4,858,178 | $ 7,229,014
Gross Unrealized Gains | 2,267 | 32,094
Gross Unrealized Losses | 76,938 | 80,928
Fair Value | 4,783,507 | 7,180,180
Investment securities held to maturity |  |
Cost | 2,299,774 | 76
U. S. Treasury |  |
Investment securities available for sale |  |
Cost | 1,508,435 | 1,658,410
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 4,461 | 546
Fair Value | 1,503,974 | 1,657,864
Government Agency |  |
Investment securities available for sale |  |
Cost | 131,233 | 8,695
Gross Unrealized Gains | 157 | 15
Gross Unrealized Losses | 355 | 40
Fair Value | 131,035 | 8,670
Mortgage Backed Securities |  |
Investment securities available for sale |  |
Cost | 3,104,316 | 5,419,379
Gross Unrealized Gains | 1,621 | 1,529
Gross Unrealized Losses | 71,872 | 80,152
Fair Value | 3,034,065 | 5,340,756
Investment securities held to maturity |  |
Cost | 2,299,774 | 76
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 3,778 | 5
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 1,459 | 0
Fair Value | 2,302,093 | 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 | 108,649 | 59,414
Gross Unrealized Gains | 391 | 557
Gross Unrealized Losses | 250 | 8
Fair Value | 108,790 | 59,963
Other |  |
Investment securities available for sale |  |
Cost | 5,545 | 7,645
Gross Unrealized Gains | 98 | 256
Gross Unrealized Losses | 0 | 182
Fair Value | $ 5,643 | $ 7,719

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