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Other Borrowings - Additional Information (Details) - USD ($)
 1 Months Ended 12 Months Ended
Oct. 10, 2019
Apr. 30, 2019
May 31, 2019
Jul. 31, 2017
Dec. 31, 2019
Dec. 31, 2017
Dec. 31, 2018
Apr. 30, 2017
Oct. 13, 2016
Line Of Credit Facility [Line Items]                  
Line of credit facility, amount   $ 5,700,000              
Repayment of lines of credit     $ 5,700,000 $ 16,200,000 $ 11,335,000 $ 20,650,000      
Short-term credit lines available for use, outstanding         $ 0   $ 0    
LIBOR Rate                  
Line Of Credit Facility [Line Items]                  
Interest rate spread   2.25%              
Ridgestone | Correspondent Bank | Credit agreement                  
Line Of Credit Facility [Line Items]                  
Line of credit facility, amount                 $ 30,000,000
Ridgestone | Correspondent Bank | Amended Credit Agreement                  
Line Of Credit Facility [Line Items]                  
Line of credit facility, maturity date         Oct. 10, 2019        
Line of credit facility, revolving credit conversion to non-revolving line of credit, description         In April 2017, the revolving line of credit was amended to a non-revolving line of credit as long as the outstanding balance exceeds $5.0 million.        
Line of credit facility, revolving credit conversion to non-revolving line of credit, threshold amount               $ 5,000,000  
Threshold amount for conversion of line of credit into revolving line of credit               5,000,000  
Revolving line of credit facility, maximum borrowing capacity               $ 5,000,000  
Ridgestone | Correspondent Bank | Amended Credit Agreement | LIBOR Rate                  
Line Of Credit Facility [Line Items]                  
Interest rate spread         2.50%        
Ridgestone | Correspondent Bank | Amended Credit Agreement | Prime Rate                  
Line Of Credit Facility [Line Items]                  
Interest rate spread         0.25%        
Ridgestone | Correspondent Bank | Fourth Amendment Revolving Credit Agreement                  
Line Of Credit Facility [Line Items]                  
Line of credit facility, amount $ 15,000,000       $ 0   $ 0    
Line of credit facility, extended maturity date Oct. 09, 2020                
Line of credit facility, interest rate terms The amended revolving line of credit bears interest at either LIBOR plus 195 basis points or Prime Rate minus 75 basis points, based on the Company’s election, which is required to be communicated at least three business days prior to the commencement of an interest period. If the Company fails to provide timely notification, the interest rate will be Prime Rate minus 75 basis points. As of December 31, 2019 and 2018, the line of credit had no outstanding balance, therefore an interest rate option has not been selected.                
Ridgestone | Correspondent Bank | Fourth Amendment Revolving Credit Agreement | LIBOR Rate                  
Line Of Credit Facility [Line Items]                  
Interest rate spread 2.25%                
Ridgestone | Correspondent Bank | Fourth Amendment Revolving Credit Agreement | Prime Rate                  
Line Of Credit Facility [Line Items]                  
Interest rate spread 0.50%