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Allowance for Loan Losses and Credit Quality Indicators (Details 4) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Nonaccrual loans presented by loan class
Total	$ 27,939	$ 23,836
Acquired impaired loans	8	651
Total nonaccrual loans	27,947	24,487
Construction commercial [Member] \| Commercial loans [Member]
Nonaccrual loans presented by loan class
Total	182	461
Land development [Member] \| Commercial loans [Member]
Nonaccrual loans presented by loan class
Total	48	297
Other land loans [Member] \| Commercial loans [Member]
Nonaccrual loans presented by loan class
Total	216	35
Commercial and industrial [Member] \| Commercial loans [Member]
Nonaccrual loans presented by loan class
Total	4,402	3,905
Multi-family residential [Member] \| Commercial loans [Member]
Nonaccrual loans presented by loan class
Total	796	341
Single family non-owner occupied [Member] \| Commercial loans [Member]
Nonaccrual loans presented by loan class
Total	4,355	1,639
Non-farm, non-residential [Member] \| Commercial loans [Member]
Nonaccrual loans presented by loan class
Total	8,655	8,063
Farmland [Member] \| Commercial loans [Member]
Nonaccrual loans presented by loan class
Total	100	271
Home equity lines [Member] \| Consumer real estate [Member]
Nonaccrual loans presented by loan class
Total	670	516
Single family owner occupied [Member] \| Consumer real estate [Member]
Nonaccrual loans presented by loan class
Total	8,427	8,255
Owner occupied construction [Member] \| Consumer real estate [Member]
Nonaccrual loans presented by loan class
Total	33	1
Consumer loans [Member] \| Consumer and other loans [Member]
Nonaccrual loans presented by loan class
Total	$ 55	$ 52