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Fair value measurements - Quantitative Information About Level 3 Fair Value Measurements (Details) - Level 3 - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Home equity line of credit | Fair value of property or collateral    
Fair value measurements    
Fair value $ 77  
Selling cost 7.00%  
Loans    
Fair value measurements    
Fair value $ 77 $ 2,621
Real estate acquired in settlement of loans | Fair value of property or collateral    
Fair value measurements    
Fair value $ 186  
Selling cost 7.00%  
Residential loan | Fair value of collateral    
Fair value measurements    
Fair value   $ 613
Selling cost   7.00%
Residential loan | Fair value of collateral | Minimum    
Fair value measurements    
Appraised value   71.00%
Residential loan | Fair value of collateral | Maximum    
Fair value measurements    
Appraised value   92.00%
Residential loan | Fair value of collateral | Weighted Average    
Fair value measurements    
Appraised value, weighted average rate   84.00%
Commercial | Fair value of property or collateral | Weighted Average    
Fair value measurements    
Appraised value, weighted average rate   75.00%
Commercial | Fair value of collateral    
Fair value measurements    
Fair value   $ 2,008
Commercial | Fair value of collateral | Minimum    
Fair value measurements    
Appraised value   71.00%
Commercial | Fair value of collateral | Maximum    
Fair value measurements    
Appraised value   76.00%