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Loan Commitments and Other Related Activities - Summary of Financial Instruments With Off-Balance Sheet Risk (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Unfunded loan commitments    
Other Commitments [Line Items]    
Financial commitments, contractual amount $ 57,592 $ 34,867
Unused lines of credit    
Other Commitments [Line Items]    
Financial commitments, contractual amount 43,263 34,063
Standby letters of credit    
Other Commitments [Line Items]    
Financial commitments, contractual amount $ 68 $ 68