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11. Commitments and Contingencies (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Commitments and contingencies
Commitments to extend credit    
Commitments and contingencies 276,338 268,708
Standby letters of credit and financial guarantees written    
Commitments and contingencies $ 3,558 $ 3,651