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Line of Credit (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2019
May 31, 2019
Apr. 30, 2019
Line of Credit Facility [Line Items]          
Line of credit borrowings $ 33,239,000 $ 33,169,000      
Line of credit          
Line of Credit Facility [Line Items]          
Maximum borrowing     $ 40,000,000 $ 30,000,000 $ 25,000,000
Floor rate (as a percent) 3.75% 3.75%      
Line of credit borrowings $ 33,239,000 $ 33,169,000      
Standby letter of credit          
Line of Credit Facility [Line Items]          
Line of credit borrowings $ 900,000 $ 900,000      
Prime Rate | Line of credit          
Line of Credit Facility [Line Items]          
Spread on variable rate 0.25%