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Fair Value (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Impaired loans, principal balance $ 31,692   $ 31,692   $ 26,971
Impaired loans allowance 2,066   2,066   1,493
Impaired loans, additional provisions       782  
Fair Value Measurement (Textual) [Abstract]          
Fair value changes attributed to unrealized gains 213 (313) 237 (226)  
Realized gains on sale of securities 62 0 218 10  
Dividend Income, Operating 16 8 47 23  
Pooled SBA [Member]
         
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Securities transferred to the Level 1 Fair value   3,437   3,437  
Number of Pooled SBA securities, transferred from level 2 to level 1       2  
Collateral Dependent Loans [Member]
         
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Impaired loans, principal balance 14,678   14,678   22,384
Impaired loans allowance 1,987   1,987   1,493
Impaired loans, additional provisions 756 530 1,544    
Level 2 [Member}
         
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Residential mortgage and asset backed securities $ 3,148