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Investment Securities (Fair Value and Gross Unrealized Loss) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Available for sale: |  |
Fair value, less than 12 months | $ 1,078,610 | $ 2,559,042
Unrealized losses, less than 12 Months | (13,417) | (52,862)
Fair value, 12 months or more | 2,037,996 | 402,147
Unrealized losses, 12 Months or More | (53,050) | (17,973)
Fair value, total | 3,116,606 | 2,961,189
Unrealized losses, total | (66,467) | (70,835)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 1,061,577 | 2,513,872
Unrealized losses, less than 12 Months | (13,157) | (52,245)
Fair value, 12 months or more | 2,029,455 | 396,695
Unrealized losses, 12 Months or More | (52,812) | (17,675)
Fair value, total | 3,091,032 | 2,910,567
Unrealized losses, total | (65,969) | (69,920)
Obligations of states and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 5,534 | 31,104
Unrealized losses, less than 12 Months | (9) | (433)
Fair value, 12 months or more | 522 |
Unrealized losses, 12 Months or More | (7) |
Fair value, total | 6,056 | 31,104
Unrealized losses, total | (16) | (433)
Equity securities |  |
Available for sale: |  |
Fair value, less than 12 months | 11,499 | 14,066
Unrealized losses, less than 12 Months | (251) | (184)
Fair value, 12 months or more | 8,019 | 5,452
Unrealized losses, 12 Months or More | (231) | (298)
Fair value, total | 19,518 | 19,518
Unrealized losses, total | $ (482) | $ (482)

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