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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities available for sale |  |
Cost | $ 4,607,117 | $ 7,229,014
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 6,425 | 32,094
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 56,432 | 80,928
Fair Value | 4,557,110 | 7,180,180
Investment securities held to maturity |  |
Cost | 2,184,653 | 76
U. S. Treasury |  |
Investment securities available for sale |  |
Cost | 1,249,243 | 1,658,410
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 633 | 0
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 2,166 | 546
Fair Value | 1,247,710 | 1,657,864
Government Agency |  |
Investment securities available for sale |  |
Cost | 257,252 | 8,695
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 222 | 15
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 639 | 40
Fair Value | 256,835 | 8,670
Mortgage Backed Securities |  |
Investment securities available for sale |  |
Cost | 2,956,793 | 5,419,379
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 5,309 | 1,529
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 52,763 | 80,152
Fair Value | 2,909,339 | 5,340,756
Investment securities held to maturity |  |
Cost | 2,184,653 | 76
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 17,339 | 5
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 490 | 0
Fair Value | 2,201,502 | 81
Equity Securities |  |
Investment securities available for sale |  |
Cost |  | 75,471
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 29,737
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments |  | 0
Fair Value |  | 105,208
Corporate Bonds |  |
Investment securities available for sale |  |
Cost | 139,906 | 59,414
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 59 | 557
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 864 | 8
Fair Value | 139,101 | 59,963
Other Debt Obligations |  |
Investment securities available for sale |  |
Cost | 3,923 | 7,645
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 202 | 256
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | 182
Fair Value | $ 4,125 | $ 7,719

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