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Line of Credit (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Sep. 29, 2019
May 30, 2019
Line of Credit Facility [Line Items]          
Line of credit $ 0 $ 33,169,000      
Line of credit          
Line of Credit Facility [Line Items]          
Maximum borrowing $ 40,000,000 $ 34,668,000 $ 40,000,000 $ 30,000,000 $ 25,000,000
Floor rate 3.25% 3.75%      
Line of credit $ 0.0 $ 33,169,000      
Standby letter of credit          
Line of Credit Facility [Line Items]          
Line of credit $ 0 $ 0      
Prime Rate | Line of credit          
Line of Credit Facility [Line Items]          
Spread on variable rate 0.25%