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Related party transactions - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]      
Deposits from related parties $ 221,015   $ 245,084
Aviation Time Sharing Agreement      
Related Party Transaction [Line Items]      
Payments to related party 11 $ 33  
Certain Executive Officers, Certain Management and Directors and Their Associates | Unfunded Loan Commitment      
Related Party Transaction [Line Items]      
Unfunded commitments 20,267   23,059
Director      
Related Party Transaction [Line Items]      
Unamortized leasehold improvements 45   $ 53
Operating lease expense $ 128 $ 128