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Off-balance sheet financial instruments - Summary of Contractual Amounts of Off-balance Sheet Commitments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Off-balance sheet financial instruments.    
Commitments to extend credit $ 336,667 $ 290,517
Unused portions of lines of credit 55,391 52,168
Standby letters of credit 34,428 45,018
Total contractual amounts of off-balance sheet commitments $ 426,486 $ 387,703