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Investment Securities (Fair Value and Gross Unrealized Loss) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Available for sale: |  |
Fair value, less than 12 months | $ 183,270 | $ 1,094,992
Unrealized losses, less than 12 Months | (581) | (9,387)
Fair value, 12 months or more | 524,260 | 1,460,634
Unrealized losses, 12 Months or More | (7,122) | (37,440)
Fair value, total | 707,530 | 2,555,626
Unrealized losses, total | (7,703) | (46,827)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 183,205 | 1,083,137
Unrealized losses, less than 12 Months | (571) | (9,333)
Fair value, 12 months or more | 518,607 | 1,454,550
Unrealized losses, 12 Months or More | (7,025) | (37,224)
Fair value, total | 701,812 | 2,537,687
Unrealized losses, total | (7,596) | (46,557)
States and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months |  | 6,814
Unrealized losses, less than 12 Months |  | (19)
Fair value, 12 months or more |  | 544
Unrealized losses, 12 Months or More |  | (6)
Fair value, total |  | 7,358
Unrealized losses, total |  | (25)
Other |  |
Available for sale: |  |
Fair value, less than 12 months | 65 | 5,041
Unrealized losses, less than 12 Months | (10) | (35)
Fair value, 12 months or more | 5,653 | 5,540
Unrealized losses, 12 Months or More | (97) | (210)
Fair value, total | 5,718 | 10,581
Unrealized losses, total | $ (107) | $ (245)

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