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Borrowings - (Details Textual) - USD ($)
Apr. 20, 2020
May 01, 2019
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Lendable collateral of loans     $ 88,600,000  
Remaining credit available     416,100,000  
Outstanding balance on line of credit     0  
Paycheck Protection Program (PPP) Liquidity Facility     134,500,000 $ 0
Line of credit, current borrowing capacity     55,000,000.0  
Subordinated debt     24,200,000 $ 24,200,000
Paycheck Protection Program, CARES Act        
Debt Instrument [Line Items]        
Debt instrument, stated interest rate 0.35%      
Proceeds from line of credit $ 140,700,000      
Paycheck Protection Program (PPP) Liquidity Facility     134,500,000  
Federal Reserve Bank Advances        
Debt Instrument [Line Items]        
Short-term debt, borrowing capacity     0  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity   $ 10,000,000.0    
Proceeds from line of credit   $ 5,300,000    
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%    
Term Note        
Debt Instrument [Line Items]        
Debt instrument, stated interest rate   4.70%    
Notes payable balance     $ 8,500,000  
Line of credit, maximum amount   $ 10,000,000.0    
Minimum        
Debt Instrument [Line Items]        
FHLB interest rate     1.05%  
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      
Weighted Average | Paycheck Protection Program, CARES Act        
Debt Instrument [Line Items]        
Debt instrument, term 2 years