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Off-balance sheet financial instruments - Summary of Contractual Amounts of Off-balance Sheet Commitments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Off-balance sheet financial instruments.    
Commitments to extend credit $ 294,122 $ 324,984
Unused portions of lines of credit 51,790 56,244
Standby letters of credit 33,275 23,387
Total contractual amounts of off-balance sheet commitments $ 379,187 $ 404,615