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Fair value estimates - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Details) - Level 3 - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Other real estate owned    
Fair Value Inputs, Assets, Quantitative Information    
Valuation Techniques Appraisal of collateral Appraisal of collateral
Liquidation expenses Liquidation expenses Liquidation expenses
Other real estate owned | Nonrecurring Basis    
Fair Value Inputs, Assets, Quantitative Information    
Assets, Fair Value Estimate $ 673 $ 216
Range and weighted average of appraisal adjustments 30.70% 30.70%
Range and weighted average of liquidation expenses 5.00% 5.00%
Other real estate owned | Minimum | Nonrecurring Basis    
Fair Value Inputs, Assets, Quantitative Information    
Range and weighted average of appraisal adjustments 20.00% 25.00%
Range and weighted average of liquidation expenses 3.00% 3.00%
Other real estate owned | Maximum | Nonrecurring Basis    
Fair Value Inputs, Assets, Quantitative Information    
Range and weighted average of appraisal adjustments 55.90% 41.30%
Range and weighted average of liquidation expenses 6.00% 6.00%
Impaired loans    
Fair Value Inputs, Assets, Quantitative Information    
Valuation Techniques Appraisal of collateral Appraisal of collateral
Liquidation expenses Liquidation expenses Liquidation expenses
Impaired loans | Nonrecurring Basis    
Fair Value Inputs, Assets, Quantitative Information    
Assets, Fair Value Estimate $ 3,289 $ 3,424
Range and weighted average of appraisal adjustments 58.50% 67.20%
Range and weighted average of liquidation expenses 4.70% 4.90%
Impaired loans | Minimum | Nonrecurring Basis    
Fair Value Inputs, Assets, Quantitative Information    
Range and weighted average of appraisal adjustments 7.70% 4.00%
Range and weighted average of liquidation expenses 3.00% 3.00%
Impaired loans | Maximum | Nonrecurring Basis    
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%