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Investments (Aggregate Values and Unrealized Gains and Losses) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Investment securities available for sale |  |
Cost | $ 6,622,617 | $ 7,079,287
Gross Unrealized Gains | 29,404 | 15,324
Gross Unrealized Losses | 55,571 | 88,031
Fair Value | 6,596,450 | 7,006,580
Investment securities held to maturity |  |
Cost | 80 | 98
U. S. Treasury |  |
Investment securities available for sale |  |
Cost | 1,619,225 | 1,650,675
Gross Unrealized Gains | 0 | 579
Gross Unrealized Losses | 3,091 | 935
Fair Value | 1,616,134 | 1,650,319
Government Agency |  |
Investment securities available for sale |  |
Cost | 40,080 | 40,291
Gross Unrealized Gains | 1 | 107
Gross Unrealized Losses | 0 | 0
Fair Value | 40,081 | 40,398
Mortgage Backed Securities |  |
Investment securities available for sale |  |
Cost | 4,822,517 | 5,259,466
Gross Unrealized Gains | 1,951 | 2,809
Gross Unrealized Losses | 52,226 | 86,850
Fair Value | 4,772,242 | 5,175,425
Investment securities held to maturity |  |
Cost | 80 | 98
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 6 | 6
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 0 | 0
Fair Value | 86 | 104
Equity Securities |  |
Investment securities available for sale |  |
Cost | 78,753 | 71,873
Gross Unrealized Gains | 27,106 | 11,634
Gross Unrealized Losses | 0 | 0
Fair Value | 105,859 | 83,507
Corporate Bonds |  |
Investment securities available for sale |  |
Cost | 54,412 | 49,367
Gross Unrealized Gains | 331 | 195
Gross Unrealized Losses | 38 | 0
Fair Value | 54,705 | 49,562
Other Debt Obligations |  |
Investment securities available for sale |  |
Cost | 7,630 | 7,615
Gross Unrealized Gains | 15 | 0
Gross Unrealized Losses | 216 | 246
Fair Value | $ 7,429 | $ 7,369

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