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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities available for sale |  |
Cost | $ 7,015,200 | $ 7,229,014
Gross Unrealized Gains | 1,412 | 32,094
Gross Unrealized Losses | 158,872 | 80,928
Fair Value | 6,857,740 | 7,180,180
Investment securities held to maturity |  |
Cost | 74 | 76
U. S. Treasury |  |
Investment securities available for sale |  |
Cost | 1,557,991 | 1,658,410
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 4,098 | 546
Fair Value | 1,553,893 | 1,657,864
Government Agency |  |
Investment securities available for sale |  |
Cost | 32,006 | 8,695
Gross Unrealized Gains | 12 | 15
Gross Unrealized Losses | 109 | 40
Fair Value | 31,909 | 8,670
Mortgage Backed Securities |  |
Investment securities available for sale |  |
Cost | 5,360,251 | 5,419,379
Gross Unrealized Gains | 1,001 | 1,529
Gross Unrealized Losses | 154,585 | 80,152
Fair Value | 5,206,667 | 5,340,756
Investment securities held to maturity |  |
Cost | 74 | 76
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 5 | 5
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 0 | 0
Fair Value | 79 | 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 | 59,414 | 59,414
Gross Unrealized Gains | 319 | 557
Gross Unrealized Losses | 80 | 8
Fair Value | 59,653 | 59,963
Other |  |
Investment securities available for sale |  |
Cost | 5,538 | 7,645
Gross Unrealized Gains | 80 | 256
Gross Unrealized Losses | 0 | 182
Fair Value | $ 5,618 | $ 7,719

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