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Investment Securities (Information Concerning Investments with Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
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Jun. 30, 2013 | Dec. 31, 2012
Information concerning investments with unrealized losses |  |
Investment securities available for sale, Less than 12 months, Fair Value | $ 48,146 | $ 9,031
Investment securities available for sale, Less than 12 months, Unrealized Losses | (1,287) | (118)
Investment securities available for sale, 12 months or longer, Fair Value | 2,935 | 349
Investment securities available for sale, 12 months or longer, Unrealized Losses | (65) | (2)
Investment securities available for sale, Total, Fair Value | 51,081 | 9,380
Investment securities available for sale, Gross Unrealized Losses | (1,352) | (120)
Investment securities held to maturity, Less than 12 months, Fair Value | 9,464 | 965
Investment securities held to maturity, Less than 12 months, Unrealized Losses | (467) | (35)
Investment securities held to maturity, 12 months or longer, Fair Value | 2,993 | 1,981
Investment securities held to maturity, 12 months or longer, Unrealized Losses | (7) | (20)
Investment securities held to maturity, Total Fair Value | 12,457 | 2,946
Investment securities held to maturity, Total Unrealized Losses | (474) | (55)
U.S. Agency [Member] |  |
Information concerning investments with unrealized losses |  |
Investment securities available for sale, Less than 12 months, Fair Value | 5,885 | 993
Investment securities available for sale, Less than 12 months, Unrealized Losses | (164) | (7)
Investment securities available for sale, 12 months or longer, Fair Value |  |
Investment securities available for sale, 12 months or longer, Unrealized Losses |  |
Investment securities available for sale, Total, Fair Value | 5,885 | 993
Investment securities available for sale, Gross Unrealized Losses | (164) | (7)
U.S. Agency mortgage-backed securities [Member] |  |
Information concerning investments with unrealized losses |  |
Investment securities available for sale, Less than 12 months, Fair Value | 35,465 | 1,140
Investment securities available for sale, Less than 12 months, Unrealized Losses | (928) | (8)
Investment securities available for sale, 12 months or longer, Fair Value |  | 349
Investment securities available for sale, 12 months or longer, Unrealized Losses |  | (2)
Investment securities available for sale, Total, Fair Value | 35,465 | 1,489
Investment securities available for sale, Gross Unrealized Losses | (928) | (10)
Investment securities held to maturity, Less than 12 months, Fair Value | 7,594 |
Investment securities held to maturity, Less than 12 months, Unrealized Losses | (330) |
Investment securities held to maturity, 12 months or longer, Fair Value |  |
Investment securities held to maturity, 12 months or longer, Unrealized Losses |  |
Investment securities held to maturity, Total Fair Value | 7,594 |
Investment securities held to maturity, Total Unrealized Losses | (330) |
Corporate bonds [Member] |  |
Information concerning investments with unrealized losses |  |
Investment securities available for sale, Less than 12 months, Fair Value | 6,796 | 6,898
Investment securities available for sale, Less than 12 months, Unrealized Losses | (195) | (103)
Investment securities available for sale, 12 months or longer, Fair Value | 2,935 |
Investment securities available for sale, 12 months or longer, Unrealized Losses | (65) |
Investment securities available for sale, Total, Fair Value | 9,731 | 6,898
Investment securities available for sale, Gross Unrealized Losses | (260) | (103)
Taxable Municipal [Member] |  |
Information concerning investments with unrealized losses |  |
Investment securities held to maturity, Less than 12 months, Fair Value | 951 |
Investment securities held to maturity, Less than 12 months, Unrealized Losses | (61) |
Investment securities held to maturity, 12 months or longer, Fair Value |  |
Investment securities held to maturity, 12 months or longer, Unrealized Losses |  |
Investment securities held to maturity, Total Fair Value | 951 |
Investment securities held to maturity, Total Unrealized Losses | (61) |
Corporate bonds and other securities [Member] |  |
Information concerning investments with unrealized losses |  |
Investment securities held to maturity, Less than 12 months, Fair Value | 919 | 965
Investment securities held to maturity, Less than 12 months, Unrealized Losses | (76) | (35)
Investment securities held to maturity, 12 months or longer, Fair Value | 2,993 | 1,981
Investment securities held to maturity, 12 months or longer, Unrealized Losses | (7) | (20)
Investment securities held to maturity, Total Fair Value | 3,912 | 2,946
Investment securities held to maturity, Total Unrealized Losses | $ (83) | $ (55)

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- Definition Amount of unrealized loss on investments in held-to-maturity securities 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 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: 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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