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Investment Securities (Fair Value and Gross Unrealized Loss) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Available for sale: |  |
Fair value, less than 12 months | $ 189,270 | $ 1,094,992
Unrealized losses, less than 12 Months | (754) | (9,387)
Fair value, 12 months or more | 1,293,441 | 1,460,634
Unrealized losses, 12 Months or More | (13,544) | (37,440)
Fair value, total | 1,482,711 | 2,555,626
Unrealized losses, total | (14,298) | (46,827)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 187,800 | 1,083,137
Unrealized losses, less than 12 Months | (737) | (9,333)
Fair value, 12 months or more | 1,287,279 | 1,454,550
Unrealized losses, 12 Months or More | (13,408) | (37,224)
Fair value, total | 1,475,079 | 2,537,687
Unrealized losses, total | (14,145) | (46,557)
States and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months | 1,407 | 6,814
Unrealized losses, less than 12 Months | (5) | (19)
Fair value, 12 months or more | 545 | 544
Unrealized losses, 12 Months or More | (3) | (6)
Fair value, total | 1,952 | 7,358
Unrealized losses, total | (8) | (25)
Other |  |
Available for sale: |  |
Fair value, less than 12 months | 63 | 5,041
Unrealized losses, less than 12 Months | (12) | (35)
Fair value, 12 months or more | 5,617 | 5,540
Unrealized losses, 12 Months or More | (133) | (210)
Fair value, total | 5,680 | 10,581
Unrealized losses, total | $ (145) | $ (245)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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