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Retirement Plan - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Retirement Benefits [Abstract]        
Employer matching contribution, percent of match     4.00%  
Salaries and employee benefits $ 419 $ 282 $ 1,145 $ 820