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Loans and Asset Quality Information (Details Narrative) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Unamortized premiums on loans $ 601,000   $ 601,000 $ 1,065,000 $ 949,000
Percentage of loan discount accretion 80.00%   80.00%    
Contractual Balance of nonaccruals covered by FDIC loss share agreements 67,900,000   67,900,000 65,000,000 69,000,000
Proceeds from payments that exceeded the initial carrying amount of purchased impaired loans     0 717,000  
Partial charge-offs on purchased loans outstanding     21,495,000    
Reclassification of perfoming loans to TDR status 18,000,000 12,000,000      
Purchased Nonimpaired Loans
          
Accreted discount on purchased nonimpaired loans into interest income     10,455,000    
Loan discount on loans 62,805,000   62,805,000    
Purchased Nonperfoming Loans
          
Loan discount on loans $ 23,070,000   $ 23,070,000