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10. Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]  
Future minimum lease payments required for all operating leases
(Dollars in thousands)      
       
Year ending December 31,      
2013   $ 542  
2014     516  
2015     482  
2016     482  
2017     428  
Thereafter     1,667  
Total minimum obligation   $ 4,117  
Required collateral or other security to support financial instruments with credit risk
(Dollars in thousands)            
    Contractual Amount  
    2012     2011  
Financial instruments whose contract amount represent credit risk:            
             
    Commitments to extend credit   $ 133,919       131,565  
                 
    Standby letters of credit and financial guarantees written   $ 3,297       3,288