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Summary of Significant Accounting Policies - Employee Benefit Plans and Operating Segments (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
segment
shares
Dec. 31, 2019
USD ($)
shares
Aug. 31, 2020
USD ($)
Employee Benefit Plans      
Age 21 years    
Minimum service term 3 months    
Vesting period 3 years    
Employer contribution under 401(k) plan | $ $ 1,100,000 $ 636,000  
Employer contribution under ESOP | $ 1,200,000 $ 325,000  
One-time contribution under ESOP | $ $ 600,000    
Shares purchased under ESOP | shares 161,576 0  
Shares purchased under ESOP | shares 133,280    
Shares committed to be released | shares 13,328    
Unallocated shares | shares 119,952    
Average market value of shares purchased under ESOP | $ $ 15.06    
Shares held by ESOP | shares 225,687    
Employee Stock Ownership Plan ESOP Value Shares Purchase Authorized Amount | $ $ 2,000,000   $ 2,000,000
Operating Segments      
Number of Operating Segments | segment 3