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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