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Investment Securities (Fair Value and Gross Unrealized Loss) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Available for sale: |  |
Fair value, less than 12 months | $ 813,131 | $ 1,094,992
Unrealized losses, less than 12 Months | (4,010) | (9,387)
Fair value, 12 months or more | 418,620 | 1,460,634
Unrealized losses, 12 Months or More | (6,919) | (37,440)
Fair value, total | 1,231,751 | 2,555,626
Unrealized losses, total | (10,929) | (46,827)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 812,590 | 1,083,137
Unrealized losses, less than 12 Months | (4,009) | (9,333)
Fair value, 12 months or more | 412,993 | 1,454,550
Unrealized losses, 12 Months or More | (6,796) | (37,224)
Fair value, total | 1,225,583 | 2,537,687
Unrealized losses, total | (10,805) | (46,557)
Obligations of states and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 541 | 6,814
Unrealized losses, less than 12 Months | (1) | (19)
Fair value, 12 months or more |  | 544
Unrealized losses, 12 Months or More |  | (6)
Fair value, total | 541 | 7,358
Unrealized losses, total | (1) | (25)
Equity securities |  |
Available for sale: |  |
Fair value, less than 12 months |  | 5,041
Unrealized losses, less than 12 Months |  | (35)
Fair value, 12 months or more | 5,627 | 5,540
Unrealized losses, 12 Months or More | (123) | (210)
Fair value, total | 5,627 | 10,581
Unrealized losses, total | $ (123) | $ (245)

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