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Borrowed Funds - Narrative (Details) - USD ($)
Sep. 30, 2021
Sep. 27, 2016
Short-term Debt [Line Items]    
Line of credit maximum borrowing capacity   $ 50,000,000
Federal Home Loan Bank Advances | Minimum    
Short-term Debt [Line Items]    
FHLB fixed interest rate (as a percent) 0.00%  
Federal Home Loan Bank Advances | Maximum    
Short-term Debt [Line Items]    
FHLB fixed interest rate (as a percent) 1.97%