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Regulatory matters - Additional Information (Details) - USD ($)
 12 Months Ended
Jan. 01, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Capitalization          
Capital stock (as a percent)   100.00%      
Period over which the Company may only declare and pay dividends out of accumulated net earnings, including accumulated net earnings acquired as a result of a merger   7 years      
Funds available for transfers   $ 25,530,000      
Loans outstanding   $ 0 $ 0    
Phase in period for capital conservation buffer 4 years        
Capital conservation buffer 2.50% 2.50% 1.875% 1.25%  
Maximum          
Schedule of Capitalization          
Net earnings which must set aside as a surplus (as a percent)   10.00%      
Capital conservation buffer         0.625%
Minimum          
Schedule of Capitalization          
Net earnings to surplus funds (as a percent)   10.00%