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Summary of changes in restricted stock awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restricted Stock [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]              
Restricted stock       50,496 46,074 20,520 0
Restricted stock       $ 50.42 $ 45.88 $ 46.30 $ 0
Restricted stock       $ 2,546 $ 2,114 $ 950 $ 0
Restricted stock       3 years 3 years 1 month 5 days 3 years 4 months 25 days  
Restricted stock, vested       (15,679) (2,224)    
Restricted stock       $ 47.56 $ 45.55    
Restricted stock       $ (746) $ (101)    
Restricted stock       (1,363)      
Restricted stock       $ 46.30      
Restricted stock       $ (63)      
Performance Based Awards Granted [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]              
Restricted stock 14,016 18,882 20,520 14,016 18,882 20,520  
Restricted stock       $ 57.80 $ 45.55 $ 46.30  
Restricted stock       $ 810 $ 860 $ 950  
Time Based Awards Granted [Member]              
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]              
Restricted stock 7,448 8,896   7,448 8,896    
Restricted stock       $ 57.80 $ 45.55    
Restricted stock       $ 431 $ 405