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Investments (Tables) | 3 Months Ended
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Mar. 31, 2013
Investments [Abstract] |
Schedule of Available-for-sale Securities Reconciliation | The amortized cost and estimated fair value of investment securities available-for-sale are as follows (dollars in thousands, unaudited):
|  | March 31, 2013 |
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |
U.S. Government agencies |  | $ | 4,698 |  | $ | 4 |  | $ | (18) |  | $ | 4,684 |
Obligations of state and |  |  |  |  |  |  |  |  |  |  |  |  |
political subdivisions |  |  | 78,445 |  |  | 3,241 |  |  | (489) |  |  | 81,197 |
U.S. Government agencies |  |  |  |  |  |  |  |  |  |  |  |  |
collateralized by mortgage |  |  |  |  |  |  |  |  |  |  |  |  |
obligations |  |  | 308,044 |  |  | 3,779 |  |  | (1,051) |  |  | 310,772 |
Equity Securities |  |  | 1,336 |  |  | 766 |  |  | - |  |  | 2,102 |
|  | $ | 392,523 |  | $ | 7,790 |  | $ | (1,558) |  | $ | 398,755 |
|  | December 31, 2012 |
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |
U.S. Government agencies |  | $ | 2,987 |  | $ | 3 |  | $ | (17) |  | $ | 2,973 |
Obligations of state and |  |  |  |  |  |  |  |  |  |  |  |  |
political subdivisions |  |  | 70,736 |  |  | 3,430 |  |  | (180) |  |  | 73,986 |
U.S. Government agencies |  |  |  |  |  |  |  |  |  |  |  |  |
collateralized by mortgage |  |  |  |  |  |  |  |  |  |  |  |  |
obligations |  |  | 298,806 |  |  | 3,547 |  |  | (964) |  |  | 301,389 |
Equity Securities |  |  | 1,336 |  |  | 508 |  |  | (4) |  |  | 1,840 |
|  | $ | 373,865 |  | $ | 7,488 |  | $ | (1,165) |  | $ | 380,188 |
Information Pertaining to Investment Securities Aggregated by Investment Category and Length of Time that Individual Securities in a Continuous Loss Position | At March 31, 2013 and December 31, 2012, the Company had 130 securities and 89 securities, respectively, with unrealized losses. Management has evaluated those securities as of the respective dates, and does not believe that any of the associated unrealized losses are other than temporary. Information pertaining to our investment securities with unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous loss position, is disclosed in the table below. Investment Portfolio - Unrealized Losses (dollars in thousands, unaudited)
|  | March 31, 2013 |
|  | Less than Twelve Months |  | Over Twelve Months |
|  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |
US Government Agencies |  | $ | (18) |  | $ | 1,993 |  | $ | - |  | $ | - |
Obligations of State and Political Subdivisions |  |  | (475) |  |  | 22,550 |  |  | (15) |  |  | 318 |
U.S. Government agencies collateralized by mortgage |  |  |  |  |  |  |  |  |  |  |  |  |
obligations |  |  | (919) |  |  | 112,437 |  |  | (132) |  |  | 11,942 |
Other Securities |  |  | - |  |  | - |  |  | - |  |  | - |
Total |  | $ | (1,412) |  | $ | 136,980 |  | $ | (147) |  | $ | 12,260 |
|  | December 31, 2012 |
|  | Less than Twelve Months |  | Over Twelve Months |
|  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |
US Government Agencies |  | $ | (17) |  | $ | 1,996 |  | $ | - |  | $ | - |
Obligations of State and Political Subdivisions |  |  | (180) |  |  | 9,324 |  |  | - |  |  | - |
U.S. Government agencies collateralized by mortgage |  |  |  |  |  |  |  |  |  |  |  |  |
obligations |  |  | (903) |  |  | 106,799 |  |  | (61) |  |  | 6,965 |
Other Securities |  |  | (4) |  |  | 242 |  |  | - |  |  | - |
Total |  | $ | (1,104) |  | $ | 118,361 |  | $ | (61) |  | $ | 6,965 |

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- Definition Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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