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Allowance for Loan Losses and Credit Quality Indicators (Details 4) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Nonaccrual loans presented by loan class |  |
Total | $ 26,506 | $ 23,836
Acquired impaired loans | 8 | 651
Total nonaccrual loans | 26,514 | 24,487
Construction, development, and other land [Member] | Commercial loans [Member] |  |
Nonaccrual loans presented by loan class |  |
Total | 480 | 793
Commercial and industrial [Member] | Commercial loans [Member] |  |
Nonaccrual loans presented by loan class |  |
Total | 3,469 | 3,905
Multi-family residential [Member] | Commercial loans [Member] |  |
Nonaccrual loans presented by loan class |  |
Total | 469 | 341
Single family non-owner occupied [Member] | Commercial loans [Member] |  |
Nonaccrual loans presented by loan class |  |
Total | 655 | 1,639
Non-farm, non-residential [Member] | Commercial loans [Member] |  |
Nonaccrual loans presented by loan class |  |
Total | 9,397 | 8,063
Agricultural [Member] | Commercial loans [Member] |  |
Nonaccrual loans presented by loan class |  |
Total | 4 |
Farmland [Member] | Commercial loans [Member] |  |
Nonaccrual loans presented by loan class |  |
Total | 744 | 271
Home equity lines [Member] | Consumer real estate loans [Member] |  |
Nonaccrual loans presented by loan class |  |
Total | 817 | 516
Single family owner occupied [Member] | Consumer real estate loans [Member] |  |
Nonaccrual loans presented by loan class |  |
Total | 10,371 | 8,255
Owner occupied construction [Member] | Consumer real estate loans [Member] |  |
Nonaccrual loans presented by loan class |  |
Total |  | 1
Consumer loans [Member] | Consumer and other loans [Member] |  |
Nonaccrual loans presented by loan class |  |
Total | 86 | 52
Other [Member] | Consumer and other loans [Member] |  |
Nonaccrual loans presented by loan class |  |
Total | $ 14 |

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- Definition Acquired impaired loans. + References No definition available. + Details
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Period Type: | instant

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- Definition Gross nonaccrual loans. + References No definition available. + Details
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Period Type: | instant

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- Definition Total nonaccrual loans. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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