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Investment Securities Temporarily Impaired Securities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 214,539 | $ 89,296 | $ 244,393
Unrealized Losses (Less than 12 months) | (14,560) | (1,910) | (25,629)
Fair Value (Estimated) (12 months or more) | 33,293 | 1,934 | 12,651
Unrealized Losses (12 months or more) | (2,953) | (121) | (1,681)
Fair Value (Estimated) | 247,832 | 91,230 | 257,044
Unrealized Losses | (17,513) | (2,031) | (27,310)
US Treasury and Government [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 82,374 | 35,681 | 78,724
Unrealized Losses (Less than 12 months) | (9,131) | (289) | (12,757)
Fair Value (Estimated) (12 months or more) | 0 | 0 | 0
Unrealized Losses (12 months or more) | 0 | 0 | 0
Fair Value (Estimated) | 82,374 | 35,681 | 78,724
Unrealized Losses | (9,131) | (289) | (12,757)
Collateralized Mortgage Backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 81,618 | 23,546 | 96,263
Unrealized Losses (Less than 12 months) | (2,758) | (457) | (4,977)
Fair Value (Estimated) (12 months or more) | 14,324 | 1,652 | 5,451
Unrealized Losses (12 months or more) | (742) | (69) | (131)
Fair Value (Estimated) | 95,942 | 25,198 | 101,714
Unrealized Losses | (3,500) | (526) | (5,108)
US States and Political Subdivisions Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 50,480 | 30,069 | 69,406
Unrealized Losses (Less than 12 months) | (2,669) | (1,164) | (7,895)
Fair Value (Estimated) (12 months or more) | 18,918 | 0 | 7,150
Unrealized Losses (12 months or more) | (2,210) | 0 | (1,548)
Fair Value (Estimated) | 69,398 | 30,069 | 76,556
Unrealized Losses | (4,879) | (1,164) | (9,443)
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 67 | 0 | 0
Unrealized Losses (Less than 12 months) | (2) | 0 | 0
Fair Value (Estimated) (12 months or more) | 51 | 282 | 50
Unrealized Losses (12 months or more) | (1) | (52) | (2)
Fair Value (Estimated) | 118 | 282 | 50
Unrealized Losses | $ (3) | $ (52) | $ (2)

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a 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 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + 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 + Details
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