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Allowance for Loan Losses and Credit Quality Indicators (Details 6) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Loans modified as troubled debt restructurings excluding those on nonaccrual status |  |  |  |
Total Contracts |  |  | $ 1 | $ 6
Pre-Modification Recorded Investment |  |  | 351 | 1,278
Post-Modification Recorded Investment |  |  | 318 | 1,255
Below market interest rate [Member] |  |  |  |
Loans modified as troubled debt restructurings excluding those on nonaccrual status |  |  |  |
Total Contracts |  | 1 |  | 6
Pre-Modification Recorded Investment |  | 72 |  | 1,278
Post-Modification Recorded Investment |  | 72 |  | 1,255
Below market interest rate [Member] | Non-farm, non-residential [Member] |  |  |  |
Loans modified as troubled debt restructurings excluding those on nonaccrual status |  |  |  |
Total Contracts |  |  |  | 2
Pre-Modification Recorded Investment |  |  |  | 480
Post-Modification Recorded Investment |  |  |  | 480
Below market interest rate [Member] | Single family owner occupied [Member] |  |  |  |
Loans modified as troubled debt restructurings excluding those on nonaccrual status |  |  |  |
Total Contracts |  | 1 |  | 4
Pre-Modification Recorded Investment |  | 72 |  | 798
Post-Modification Recorded Investment |  | 72 |  | 775
Extended payment term [Member] |  |  |  |
Loans modified as troubled debt restructurings excluding those on nonaccrual status |  |  |  |
Total Contracts |  |  | 1 |
Pre-Modification Recorded Investment |  |  | 351 |
Post-Modification Recorded Investment |  |  | 318 |
Extended payment term [Member] | Single family owner occupied [Member] |  |  |  |
Loans modified as troubled debt restructurings excluding those on nonaccrual status |  |  |  |
Total Contracts |  |  | 1 |
Pre-Modification Recorded Investment |  |  | 351 |
Post-Modification Recorded Investment |  |  | $ 318 |

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