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Summary of quarterly financial information - Summary of Quarterly Financial Information (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Summary of quarterly financial information (unaudited)      
Interest income $ 94,057 $ 94,125 $ 93,381
Interest expense 9,422 14,324 17,868
Net interest income 84,635 79,801 75,513
Provision for loan losses 1,750 7,400 6,100
Net interest income after provision for loan losses 82,885 72,401 69,413
Noninterest income 25,636 16,642 15,120
Noninterest expense 55,004 54,868 55,642
Income before income taxes 53,517 34,175 28,891
Income tax expense 9,998 4,821 3,155
Net income $ 43,519 $ 29,354 $ 25,736
Per share data:      
Net income - basic $ 6.05 $ 4.02 $ 3.48
Net income - diluted $ 6.02 $ 4.00 $ 3.47
Average common shares outstanding - basic 7,196,160 7,304,956 7,395,429
Average common shares outstanding - diluted 7,235,303 7,337,843 7,412,369