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10. Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Rental Payments for Operating Leases
(Dollars in thousands)    
     
Year ending December 31,    
2017   $ 632
2018     611
2019     601
2020     602
2021     591
Thereafter     1,611
Total minimum obligation   $ 4,648
Financial instruments with credit risk
(Dollars in thousands)          
    Contractual Amount
    2016     2015
Financial instruments whose contract amount represent credit risk:          
           
Commitments to extend credit   $ 195,528       189,351
               
Standby letters of credit and financial guarantees written   $ 3,728       3,872