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Off-balance sheet financial instruments - Summary of Contractual Amounts of Off-balance Sheet Commitments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Off-balance sheet financial instruments.    
Commitments to extend credit $ 290,517 $ 294,122
Unused portions of lines of credit 52,168 51,790
Standby letters of credit 45,018 33,275
Total contractual amounts of off-balance sheet commitments $ 387,703 $ 379,187