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Borrowed Funds (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Repurchase agreements secured by available for sale securities $ 158,700,000 $ 137,100,000
FHLB advances secured by loans receivable $ 191,580,000  
Borrowing capacity to assets, percentage 30.00%  
FHLB, available funds $ 520,100,000 515,200,000
FHLB available credit 188,200,000  
Repayments of long-term debt 70,000,000  
Aggregated liquidation amount $ 66,000 70,000
Maximum Allowable Period Of Interest Deferment 20  
Federal Home Loan Bank Advances [Member]    
Debt Instrument [Line Items]    
Repayments of long-term debt $ 70,000,000.0  
Prepayment penalty fee 2,400,000  
Securities Sold under Agreements to Repurchase [Member]    
Debt Instrument [Line Items]    
Repurchase agreements secured by available for sale securities 69,300,000 68,300,000
Various Financial Institutions [Member]    
Debt Instrument [Line Items]    
Line of credit facility, available funding 130,000,000.0  
Outstandin borrowings 0 $ 0
Federal Reserve Bank [Member]    
Debt Instrument [Line Items]    
Line of credit facility, available funding $ 1,000,000.0  
Maximum [Member] | Federal Home Loan Bank Advances [Member]    
Debt Instrument [Line Items]    
Reporting date interest rate   2.90%
Minimum [Member] | Federal Home Loan Bank Advances [Member]    
Debt Instrument [Line Items]    
Reporting date interest rate 0.00% 1.37%
First United Statutory Trust I And II [Member]    
Debt Instrument [Line Items]    
Aggregated liquidation amount $ 900,000  
Debenture issue date March 2004  
Trust preferred securities $ 30,000,000.0  
First United Statutory Trust I [Member] | Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Variable interest rate three-month LIBOR plus 275 basis points  
Reporting date interest rate 2.97%  
Debenture issued to unconsolidated subsidiary $ 20,600,000  
Earliest availability for redemption 5 years  
Maturity date 2034  
First United Statutory Trust II [Member] | Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Variable interest rate three-month LIBOR plus 275 basis points  
Reporting date interest rate 2.97%  
Debenture issued to unconsolidated subsidiary $ 10,300,000  
Earliest availability for redemption 5 years  
Maturity date 2034