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Loans Receivable and Allowance For Loan Losses - Related Party Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Loans and Leases Receivable, Related Parties [Roll Forward]    
Beginning balance $ 3,249 $ 3,325
Additions 581  
Repayments (33) (76)
Ending balance 3,797 3,249
Aggregate loan balances of extended credit $ 4,200 $ 3,600