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Summary of significant accounting policies - Adoption of new accounting standard (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses $ 23,218 $ 25,444   $ 27,472 $ 29,374 $ 28,407 $ 28,383
Stockholders' equity 331,787 $ 328,634   315,350 $ 311,897 $ 320,461 $ 340,126
Accrued interest receivable on loans 9,700            
Accrued interest receivable on available of sale securities 1,500            
Accrued interest receivable on held to maturity securities $ 198            
Cumulative impact of adoption | ASU 2016-13              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for credit losses     $ 3,000 (3,283)      
Stockholders' equity     $ 2,400 $ 2,364