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Fair value of financial instruments - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring Basis - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Other real estate owned    
Fair Value Inputs, Assets, Quantitative Information    
Range and weighted average of appraisal adjustments 43.70% 38.90%
Range and weighted average of liquidation expenses 5.00% 5.00%
Other real estate owned | Minimum    
Fair Value Inputs, Assets, Quantitative Information    
Range and weighted average of appraisal adjustments 20.00% 26.00%
Range and weighted average of liquidation expenses 3.00% 3.00%
Other real estate owned | Maximum    
Fair Value Inputs, Assets, Quantitative Information    
Range and weighted average of appraisal adjustments 63.60% 73.30%
Range and weighted average of liquidation expenses 6.00% 6.00%
Impaired loans    
Fair Value Inputs, Assets, Quantitative Information    
Range and weighted average of appraisal adjustments 54.40% 61.80%
Range and weighted average of liquidation expenses 5.20% 4.40%
Impaired loans | Minimum    
Fair Value Inputs, Assets, Quantitative Information    
Range and weighted average of appraisal adjustments 8.60% 7.10%
Range and weighted average of liquidation expenses 3.00% 3.00%
Impaired loans | Maximum    
Fair Value Inputs, Assets, Quantitative Information    
Range and weighted average of appraisal adjustments 97.00% 97.00%
Range and weighted average of liquidation expenses 6.00% 6.00%
Level 3 | Other real estate owned    
Fair Value Inputs, Assets, Quantitative Information    
Assets, Fair Value Estimate $ 283 $ 234
Level 3 | Impaired loans    
Fair Value Inputs, Assets, Quantitative Information    
Assets, Fair Value Estimate $ 1,808 $ 2,809