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Investment Securities (Fair Value and Gross Unrealized Loss) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Available for sale: |  |
Fair value, less than 12 months | $ 2,465,676 | $ 2,559,042
Unrealized losses, less than 12 Months | (41,877) | (52,862)
Fair value, 12 months or more | 369,466 | 402,147
Unrealized losses, 12 Months or More | (10,892) | (17,973)
Fair value, total | 2,835,142 | 2,961,189
Unrealized losses, total | (52,769) | (70,835)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 2,429,619 | 2,513,872
Unrealized losses, less than 12 Months | (41,397) | (52,245)
Fair value, 12 months or more | 364,014 | 396,695
Unrealized losses, 12 Months or More | (10,594) | (17,675)
Fair value, total | 2,793,633 | 2,910,567
Unrealized losses, total | (51,991) | (69,920)
Obligations of states and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 21,991 | 31,104
Unrealized losses, less than 12 Months | (296) | (433)
Fair value, total | 21,991 | 31,104
Unrealized losses, total | (296) | (433)
Equity securities |  |
Available for sale: |  |
Fair value, less than 12 months | 14,066 | 14,066
Unrealized losses, less than 12 Months | (184) | (184)
Fair value, 12 months or more | 5,452 | 5,452
Unrealized losses, 12 Months or More | (298) | (298)
Fair value, total | 19,518 | 19,518
Unrealized losses, total | $ (482) | $ (482)

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