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Borrowings - Narrative (Details)
Apr. 20, 2020
USD ($)
May 01, 2019
USD ($)
arrangement
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]        
Lendable collateral of loans     $ 136,200,000  
Remaining credit available     385,400,000  
Number of borrowing arrangements entered into | arrangement   2    
Outstanding balance on line of credit     0  
Subordinated debt     24,200,000 $ 24,200,000
Line of credit, current borrowing capacity     53,000,000  
Federal Reserve Bank Advances        
Debt Instrument [Line Items]        
Short-term debt, borrowing capacity     0  
Paycheck Protection Program, CARES Act        
Debt Instrument [Line Items]        
Debt instrument, stated interest rate 0.35%      
Proceeds from line of credit $ 140,700,000      
Term Note        
Debt Instrument [Line Items]        
Line of credit, maximum amount   $ 10,000,000    
Debt instrument, stated interest rate   4.70%    
Notes payable balance     7,500,000  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity   $ 10,000,000    
Outstanding balance on line of credit     $ 5,300,000  
Revolving Credit Facility | Prime Rate        
Debt Instrument [Line Items]        
Basis spread on variable rate   0.40%    
Minimum        
Debt Instrument [Line Items]        
FHLB interest rate     1.07%  
Minimum | Paycheck Protection Program, CARES Act        
Debt Instrument [Line Items]        
Debt instrument, term 2 years      
Maximum        
Debt Instrument [Line Items]        
FHLB interest rate     3.51%  
Maximum | Paycheck Protection Program, CARES Act        
Debt Instrument [Line Items]        
Debt instrument, term 5 years