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Other Borrowings - Additional Information (Details) - USD ($)
3 Months Ended
Oct. 09, 2020
Apr. 21, 2020
Oct. 10, 2019
Mar. 31, 2021
Dec. 31, 2020
Oct. 13, 2016
Line Of Credit Facility [Line Items]            
Paycheck protection program liquidity facility       $ 387,647,000 $ 371,907,000  
Federal Reserve Bank discount window borrowing       0 0  
Federal Home Loan Bank advances       $ 329,000,000 234,000,000  
Federal home loan bank advances maximum borrowing capacity as percentage of total assets       35.00%    
Federal home loan bank, required investment conversion ratio       4.50    
Minimum            
Line Of Credit Facility [Line Items]            
Federal home loan bank advances, Fixed interest rate       0.00%    
Federal home loan bank fixed rate advances, maturity date       2021-04    
Maximum            
Line Of Credit Facility [Line Items]            
Federal home loan bank advances, Fixed interest rate       22.00%    
Federal home loan bank fixed rate advances, maturity date       2021-05    
Federal Reserve Bank of Chicago Discount Window Line            
Line Of Credit Facility [Line Items]            
Paycheck protection program liquidity facility       $ 387,600,000    
Debt instrument, interest rate       0.35%    
Federal Reserve Bank of Chicago Discount Window Line | Minimum            
Line Of Credit Facility [Line Items]            
Line of credit facility, maturity month and year       2022-04    
Federal Reserve Bank of Chicago Discount Window Line | Maximum            
Line Of Credit Facility [Line Items]            
Line of credit facility, maturity month and year       2026-01    
Federal Reserve Bank of Chicago Discount Window Line | Letter Agreement            
Line Of Credit Facility [Line Items]            
Interest rate spread   0.35%        
Correspondent Bank | Credit agreement | Ridgestone            
Line Of Credit Facility [Line Items]            
Line of credit facility, amount           $ 30,000,000.0
Correspondent Bank | Fourth Amendment Revolving Credit Agreement | Ridgestone            
Line Of Credit Facility [Line Items]            
Line of credit facility, amount     $ 15,000,000.0 $ 0 $ 0  
Line of credit facility, extended maturity date Oct. 08, 2021   Oct. 09, 2020      
Line of credit facility, interest rate terms       The amended revolving line of credit bears interest at either the London Interbank Offered Rate (“LIBOR”) plus 195 basis points or the 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. At March 31, 2021 and December 31, 2020, the line of credit had no outstanding balance.    
Correspondent Bank | Amended Credit Agreement | Ridgestone | LIBOR Rate            
Line Of Credit Facility [Line Items]            
Interest rate spread     1.95%      
Correspondent Bank | Amended Credit Agreement | Ridgestone | Prime Rate            
Line Of Credit Facility [Line Items]            
Interest rate spread     0.75%