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Allowance for Loan Losses (Details 1) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Allowance by impairment methodology and loans by impairment methodology      
Balance at beginning of year $ 12,937 $ 16,036 $ 16,036
Charge-offs (2,583) (7,137) (15,789)
Recoveries 240 208 310
Provision for loan losses 3,455 9,395 12,380
Balance at end of period 14,049 18,502 12,937
Allowance for Credit Losses, Individually evaluated for impairment 3,239   2,438
Allowance for Credit Losses, Collectively evaluated for impairment 10,810   10,499
Total 380,752   392,440
Individually evaluated for impairment 19,872   25,920
Collectively evaluated for impairment 360,880   366,520
Construction and Land Development [Member]
      
Allowance by impairment methodology and loans by impairment methodology      
Balance at beginning of year 2,843 4,050 4,050
Charge-offs (369)   (2,983)
Recoveries 1   50
Provision for loan losses 1,059   1,726
Balance at end of period 3,534   2,843
Allowance for Credit Losses, Individually evaluated for impairment 1,728   930
Allowance for Credit Losses, Collectively evaluated for impairment 1,806   1,913
Total 44,725   48,363
Individually evaluated for impairment 6,353   7,640
Collectively evaluated for impairment 38,372   40,723
Secured by 1-4 family residential [Member]
      
Allowance by impairment methodology and loans by impairment methodology      
Balance at beginning of year 3,766 1,681 1,681
Charge-offs (761)   (4,639)
Recoveries 2   6
Provision for loan losses 992   6,718
Balance at end of period 3,999   3,766
Allowance for Credit Losses, Individually evaluated for impairment 709   848
Allowance for Credit Losses, Collectively evaluated for impairment 3,290   2,918
Total 128,354   122,339
Individually evaluated for impairment 4,758   6,860
Collectively evaluated for impairment 123,596   115,479
Other Real Estate [Member]
      
Allowance by impairment methodology and loans by impairment methodology      
Balance at beginning of year 5,192 9,187 9,187
Charge-offs (1,042)   (7,551)
Recoveries 58    
Provision for loan losses 1,531   3,556
Balance at end of period 5,739   5,192
Allowance for Credit Losses, Individually evaluated for impairment 762   351
Allowance for Credit Losses, Collectively evaluated for impairment 4,977   4,841
Total 175,122   181,141
Individually evaluated for impairment 8,597   10,940
Collectively evaluated for impairment 166,525   170,201
Commercial and Industrial [Member]
      
Allowance by impairment methodology and loans by impairment methodology      
Balance at beginning of year 963 858 858
Charge-offs (261)   (348)
Recoveries 24   3
Provision for loan losses (75)   450
Balance at end of period 651   963
Allowance for Credit Losses, Individually evaluated for impairment 40   309
Allowance for Credit Losses, Collectively evaluated for impairment 611   654
Total 24,216   29,446
Individually evaluated for impairment 164   480
Collectively evaluated for impairment 24,052   28,966
Consumer and Other Loans [Member]
      
Allowance by impairment methodology and loans by impairment methodology      
Balance at beginning of year 173 260 260
Charge-offs (150)   (268)
Recoveries 155   251
Provision for loan losses (52)   (70)
Balance at end of period 126   173
Allowance for Credit Losses, Collectively evaluated for impairment 126   173
Total 8,335   11,151
Individually evaluated for impairment       
Collectively evaluated for impairment $ 8,335   $ 11,151