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Summary of significant accounting policies - Adoption of new accounting standard (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle                  
Allowance for credit losses $ 23,010 $ 23,218     $ 27,472 $ 29,822 $ 29,374   $ 28,383
Stockholders' equity 324,390 $ 331,787 $ 328,634   315,350 $ 301,810 $ 311,897 $ 320,461 $ 340,126
Accrued interest receivable on loans 10,600                
Accrued interest receivable on available of sale securities 1,600                
Accrued interest receivable on held to maturity securities $ 185                
Cumulative impact of adoption | ASU 2016-13                  
New Accounting Pronouncements or Change in Accounting Principle                  
Allowance for credit losses       $ 3,000 (3,283)        
Stockholders' equity       $ 2,400 $ 2,364