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10. Commitments and Contingencies (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Commitments and contingencies
Commitments to extend credit    
Commitments and contingencies 233,972 195,528
Standby letters of credit and financial guarantees written    
Commitments and contingencies $ 3,325 $ 3,728