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Investment Securities (Fair Value and Gross Unrealized Loss) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
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)

X

- 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.

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-Publisher FASB
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