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Loans, Past Due (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Financing receivable, recorded investment, past due [Line Items]      
Loans 30-89 Days Past Due $ 11,583,000   $ 28,276,000
Loans 90 or More Days Past Due 9,119,000   10,530,000
Total Past Due Loans 20,702,000   38,806,000
Total Current Loans 605,080,000   631,691,000
Total loans 625,782,000   670,497,000
Accruing Loans 90 or More Days Past Due 2,398,000   2,709,000
Non-accrual loans 18,839,000   21,785,000
Threshold amount of impaired loans not individually evaluated for impairment 250,000    
Accruing impaired loans 38,700,000 21,100,000 30,600,000
Interest income recognized on accruing impaired loans 1,400,000 897,000 1,700,000
Real Estate Loans - Construction and land development [Member]
      
Financing receivable, recorded investment, past due [Line Items]      
Loans 30-89 Days Past Due 1,513,000   10,033,000
Loans 90 or More Days Past Due 1,846,000   3,338,000
Total Past Due Loans 3,359,000   13,371,000
Total Current Loans 77,374,000   80,441,000
Total loans 80,733,000   93,812,000
Accruing Loans 90 or More Days Past Due 0   0
Non-accrual loans 10,866,000   13,257,000
Real Estate Loans - Single-family residential [Member]
      
Financing receivable, recorded investment, past due [Line Items]      
Loans 30-89 Days Past Due 8,145,000   16,536,000
Loans 90 or More Days Past Due 4,758,000   6,189,000
Total Past Due Loans 12,903,000   22,725,000
Total Current Loans 236,264,000   244,326,000
Total loans 249,167,000   267,051,000
Accruing Loans 90 or More Days Past Due 2,396,000   2,709,000
Non-accrual loans 4,255,000   5,522,000
Real estate loans - Commercial [Member]
      
Financing receivable, recorded investment, past due [Line Items]      
Loans 30-89 Days Past Due 743,000   1,002,000
Loans 90 or More Days Past Due 2,492,000   958,000
Total Past Due Loans 3,235,000   1,960,000
Total Current Loans 200,368,000   212,455,000
Total loans 203,603,000   214,415,000
Accruing Loans 90 or More Days Past Due 0   0
Non-accrual loans 3,239,000   2,451,000
Real Estate Loans - Multifamily and farmland [Member]
      
Financing receivable, recorded investment, past due [Line Items]      
Loans 30-89 Days Past Due 209,000   13,000
Loans 90 or More Days Past Due 0   0
Total Past Due Loans 209,000   13,000
Total Current Loans 4,755,000   4,780,000
Total loans 4,964,000   4,793,000
Accruing Loans 90 or More Days Past Due 0   0
Total real estate loans [Member]
      
Financing receivable, recorded investment, past due [Line Items]      
Loans 30-89 Days Past Due 10,610,000   27,584,000
Loans 90 or More Days Past Due 9,096,000   10,485,000
Total Past Due Loans 19,706,000   38,069,000
Total Current Loans 518,761,000   542,002,000
Total loans 538,467,000   580,071,000
Accruing Loans 90 or More Days Past Due 2,396,000   2,709,000
Non-accrual loans 18,360,000   21,230,000
Commercial (not secured by real estate) [Member]
      
Financing receivable, recorded investment, past due [Line Items]      
Loans 30-89 Days Past Due 854,000   576,000
Loans 90 or More Days Past Due 18,000   9,000
Total Past Due Loans 872,000   585,000
Total Current Loans 59,486,000   60,061,000
Total loans 60,358,000   60,646,000
Accruing Loans 90 or More Days Past Due 0   0
Non-accrual loans 457,000   403,000
Farm loans (not secured by real estate) [Member]
      
Financing receivable, recorded investment, past due [Line Items]      
Loans 30-89 Days Past Due 0    
Loans 90 or More Days Past Due 0    
Total Past Due Loans 0    
Total Current Loans 12,000    
Total loans 12,000   0
Accruing Loans 90 or More Days Past Due 0    
Consumer loans (not secured by real estate) [Member]
      
Financing receivable, recorded investment, past due [Line Items]      
Loans 30-89 Days Past Due 119,000   116,000
Loans 90 or More Days Past Due 5,000   36,000
Total Past Due Loans 124,000   152,000
Total Current Loans 10,179,000   10,338,000
Total loans 10,303,000   10,490,000
Accruing Loans 90 or More Days Past Due 2,000   0
Non-accrual loans 22,000   152,000
All other loans (not secured by real estate) [Member]
      
Financing receivable, recorded investment, past due [Line Items]      
Loans 30-89 Days Past Due 0   0
Loans 90 or More Days Past Due 0   0
Total Past Due Loans 0   0
Total Current Loans 16,642,000   19,290,000
Total loans 16,642,000   19,290,000
Accruing Loans 90 or More Days Past Due $ 0   $ 0