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Investment Securities Temporarily Impaired Securities (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 240,605 | $ 34,420 | $ 15,315
Unrealized Losses (Less than 12 months) | (19,958) | (612) | (119)
Fair Value (Estimated) (12 months or more) | 3,470 | 2,756 | 3,295
Unrealized Losses (12 months or more) | (166) | (127) | (135)
Fair Value (Estimated) | 244,075 | 37,176 | 18,610
Unrealized Losses | (20,124) | (739) | (254)
US Treasury and Government [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 82,752 | 15,817 | 1,199
Unrealized Losses (Less than 12 months) | (8,684) | (182) | (21)
Fair Value (Estimated) (12 months or more) | 0 | 0 | 0
Unrealized Losses (12 months or more) | 0 | 0 | 0
Fair Value (Estimated) | 82,752 | 15,817 | 1,199
Unrealized Losses | (8,684) | (182) | (21)
Collateralized Mortgage Backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 84,609 | 9,982 | 12,990
Unrealized Losses (Less than 12 months) | (2,514) | (231) | (76)
Fair Value (Estimated) (12 months or more) | 3,086 | 2,534 | 3,104
Unrealized Losses (12 months or more) | (133) | (83) | (31)
Fair Value (Estimated) | 87,695 | 12,516 | 16,094
Unrealized Losses | (2,647) | (314) | (107)
US States and Political Subdivisions Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 73,244 | 8,621 | 1,123
Unrealized Losses (Less than 12 months) | (8,760) | (199) | (22)
Fair Value (Estimated) (12 months or more) | 334 | 0 | 0
Unrealized Losses (12 months or more) | (30) | 0 | 0
Fair Value (Estimated) | 73,578 | 8,621 | 1,123
Unrealized Losses | (8,790) | (199) | (22)
Equity Securities, Other [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 0 | 0 | 3
Unrealized Losses (Less than 12 months) | 0 | 0 | 0
Fair Value (Estimated) (12 months or more) | 50 | 222 | 191
Unrealized Losses (12 months or more) | (3) | (44) | (104)
Fair Value (Estimated) | 50 | 222 | 194
Unrealized Losses | $ (3) | $ (44) | $ (104)

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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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