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Fair Value of Financial Instruments (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Fair Value of Financial Instruments      
Liabilities transferred between Level 1 and Level 2 $ 0    
Other real estate owned ("OREO") 31,000   144,000
Charge-offs as a result of declines in the OREO property values 10,000 9,000  
Impaired loans 18,386,000   19,369,000
Charge-off as a result of impaired loans 350,000 1,000,000  
Level 3 | Minimum
     
Fair Value of Financial Instruments      
Discount percentage to determine net realizable value of underlying collateral for impaired loans 15.00%    
Level 3 | Maximum
     
Fair Value of Financial Instruments      
Discount percentage to determine net realizable value of underlying collateral for impaired loans 25.00%    
Recurring | Total
     
Fair Value of Financial Instruments      
Securities available for sale 274,603,000   251,967,000
Cash flow hedge (1,615,000)   (1,784,000)
Warrant portfolio 424,000   418,000
Total assets and liabilities at fair value 273,412,000   250,601,000
Recurring | Level 2
     
Fair Value of Financial Instruments      
Securities available for sale 274,603,000   251,967,000
Cash flow hedge (1,615,000)   (1,784,000)
Total assets and liabilities at fair value 272,988,000   250,183,000
Recurring | Level 3
     
Fair Value of Financial Instruments      
Warrant portfolio 424,000   418,000
Total assets and liabilities at fair value 424,000   418,000
Non-recurring
     
Fair Value of Financial Instruments      
Other real estate owned ("OREO") 31,000   144,000
Impaired loans $ 18,400,000   $ 19,400,000