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Loans and Allowance for Loan Losses - Troubled Debt Restructured Loans (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Loans
Sep. 29, 2011
Loans
Sep. 30, 2011
Loans
Sep. 30, 2012
Loans
Sep. 30, 2011
Loans
Dec. 31, 2011
Troubled Debt Restructurings            
Total amount of troubled debt restructured loans outstanding $ 35,600,000     $ 35,600,000   $ 43,500,000
Allowance for troubled debt restructed loans 1,800,000     1,800,000   2,300,000
Amount of troubled debt restructured loans accruing interest 13,900,000     13,900,000   17,200,000
Number of Loans 7   15 29 37  
Recorded Investment Prior to Modification 2,645,000   10,570,000 8,739,000 18,883,000  
Recorded Investment After Modification 2,399,000   9,377,000 7,489,000 14,610,000  
Number of troubled debt restructured loans with a payment default during the period   4   2 7  
Recorded investment of troubled debt restructured loans with payment default during period   2,927,000   602,000 3,393,000  
Below Market Rate
            
Troubled Debt Restructurings            
Number of Loans 1   3 1 4  
Recorded Investment Prior to Modification 396,000   1,871,000 396,000 2,371,000  
Recorded Investment After Modification 391,000   1,855,000 391,000 2,281,000  
Number of troubled debt restructured loans with a payment default during the period       1    
Recorded investment of troubled debt restructured loans with payment default during period       578,000    
Extended Payment Terms
            
Troubled Debt Restructurings            
Number of Loans 6   10 25 25  
Recorded Investment Prior to Modification 2,249,000   8,283,000 7,607,000 12,741,000  
Recorded Investment After Modification 2,008,000   7,249,000 6,518,000 11,042,000  
Number of troubled debt restructured loans with a payment default during the period   3   1 5  
Recorded investment of troubled debt restructured loans with payment default during period   2,130,000   24,000 2,356,000  
Principal Payment Reducation
            
Troubled Debt Restructurings            
Number of Loans     2 3 8  
Recorded Investment Prior to Modification     416,000 736,000 3,771,000  
Recorded Investment After Modification     273,000 580,000 1,287,000  
Number of troubled debt restructured loans with a payment default during the period   1     2  
Recorded investment of troubled debt restructured loans with payment default during period   797,000     1,037,000  
Real Estate Loans | Below Market Rate | Construction Loans
            
Troubled Debt Restructurings            
Number of Loans     2   3  
Recorded Investment Prior to Modification     1,721,000   2,221,000  
Recorded Investment After Modification     1,705,000   2,131,000  
Number of troubled debt restructured loans with a payment default during the period       1    
Recorded investment of troubled debt restructured loans with payment default during period       578,000    
Real Estate Loans | Below Market Rate | One to Four Family
            
Troubled Debt Restructurings            
Number of Loans 1   1 1 1  
Recorded Investment Prior to Modification 396,000   150,000 396,000 150,000  
Recorded Investment After Modification 391,000   150,000 391,000 150,000  
Real Estate Loans | Extended Payment Terms | Construction Loans
            
Troubled Debt Restructurings            
Number of Loans 2   3 5 8  
Recorded Investment Prior to Modification 521,000   595,000 1,231,000 2,705,000  
Recorded Investment After Modification 521,000   586,000 873,000 2,449,000  
Number of troubled debt restructured loans with a payment default during the period   1     1  
Recorded investment of troubled debt restructured loans with payment default during period   221,000     221,000  
Real Estate Loans | Extended Payment Terms | Owner Occupied
            
Troubled Debt Restructurings            
Number of Loans 2   4 7 9  
Recorded Investment Prior to Modification 353,000   6,834,000 2,065,000 8,230,000  
Recorded Investment After Modification 331,000   6,404,000 2,021,000 7,743,000  
Real Estate Loans | Extended Payment Terms | Non-owner Occupied
            
Troubled Debt Restructurings            
Number of Loans 2   2 3 3  
Recorded Investment Prior to Modification 1,375,000   734,000 1,586,000 1,133,000  
Recorded Investment After Modification 1,156,000   139,000 1,367,000 533,000  
Number of troubled debt restructured loans with a payment default during the period   1     1  
Recorded investment of troubled debt restructured loans with payment default during period   1,789,000     1,789,000  
Real Estate Loans | Extended Payment Terms | One to Four Family
            
Troubled Debt Restructurings            
Number of Loans       3 2  
Recorded Investment Prior to Modification       827,000 327,000  
Recorded Investment After Modification       751,000 197,000  
Number of troubled debt restructured loans with a payment default during the period   1     1  
Recorded investment of troubled debt restructured loans with payment default during period   120,000     120,000  
Real Estate Loans | Principal Payment Reducation | Construction Loans
            
Troubled Debt Restructurings            
Number of Loans     1   4  
Recorded Investment Prior to Modification     400,000   3,302,000  
Recorded Investment After Modification     258,000   1,060,000  
Number of troubled debt restructured loans with a payment default during the period   1     1  
Recorded investment of troubled debt restructured loans with payment default during period   797,000     797,000  
Real Estate Loans | Principal Payment Reducation | Owner Occupied
            
Troubled Debt Restructurings            
Number of Loans       2 1  
Recorded Investment Prior to Modification       571,000 240,000  
Recorded Investment After Modification       571,000 0  
Number of troubled debt restructured loans with a payment default during the period   0     1  
Recorded investment of troubled debt restructured loans with payment default during period         240,000  
Real Estate Loans | Principal Payment Reducation | Home Equity Lines of Credit
            
Troubled Debt Restructurings            
Number of Loans         1  
Recorded Investment Prior to Modification         165,000  
Recorded Investment After Modification         165,000  
Commercial | Extended Payment Terms
            
Troubled Debt Restructurings            
Number of Loans     1 6 3  
Recorded Investment Prior to Modification     120,000 1,872,000 346,000  
Recorded Investment After Modification     120,000 1,482,000 120,000  
Number of troubled debt restructured loans with a payment default during the period   0     2  
Recorded investment of troubled debt restructured loans with payment default during period   0     226,000  
Commercial | Principal Payment Reducation
            
Troubled Debt Restructurings            
Number of Loans     1   2  
Recorded Investment Prior to Modification     16,000   64,000  
Recorded Investment After Modification     15,000   62,000  
Consumer and other | Extended Payment Terms
            
Troubled Debt Restructurings            
Number of Loans       1 0  
Recorded Investment Prior to Modification       26,000 0  
Recorded Investment After Modification       24,000 0  
Number of troubled debt restructured loans with a payment default during the period       1    
Recorded investment of troubled debt restructured loans with payment default during period       24,000    
Consumer and other | Principal Payment Reducation
            
Troubled Debt Restructurings            
Number of Loans       1    
Recorded Investment Prior to Modification       165,000    
Recorded Investment After Modification       $ 9,000