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Related party transactions - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]          
Deposits from related parties $ 275,622   $ 275,622   $ 287,156
Aviation Time Sharing Agreement          
Related Party Transaction [Line Items]          
Payments to related party 70 $ 53 97 $ 125  
Registration Rights Agreement, 2016          
Related Party Transaction [Line Items]          
Payments to related party   700   700  
Certain Executive Officers, Certain Management and Directors and Their Associates          
Related Party Transaction [Line Items]          
Unfunded commitments 22,263   22,263   15,000
Director          
Related Party Transaction [Line Items]          
Unamortized leasehold improvements 102   102   $ 116
Lease expense $ 124 $ 111 $ 253 $ 259