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Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Feb. 08, 2021
$ / shares
shares
Sep. 30, 2021
USD ($)
payment
branch
segment
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Oct. 27, 2020
USD ($)
Oct. 09, 2013
USD ($)
Summary of Significant Accounting Policies [Line Items]            
Number of offices | branch   219        
Dividend rate 4.875%          
Proceeds from issuance of preferred stock, net   $ 293,325,000 $ 0 $ 0    
Cash collateral   $ 1,500,000 $ 97,600,000      
Days past grace period to initiate contact to cure deficiency   30 days        
Minimum days past due to begin foreclosure proceedings   90 days        
Approximate rate reduction concession, minimum   1.00%        
Approximate rate reduction concession, maximum   2.00%        
Minimum days past due to stop accrual of interest   90 days        
Loans returned to full accrual status   90 days        
Number of payments required | payment   6        
Number of reportable business segments | segment   1        
Civil money penalty from consent order issued   $ 2,500,000     $ 200,000 $ 34,000
Public Offering            
Summary of Significant Accounting Policies [Line Items]            
Number of shares issued in transaction (in shares) | shares 12,000,000          
Percentage of preferred stock 2.50%          
Public offering price (in usd per share) | $ / shares $ 25.00          
Series A Preferred Stock | Public Offering            
Summary of Significant Accounting Policies [Line Items]            
Number of shares issued in transaction (in shares) | shares 300,000          
Minimum            
Summary of Significant Accounting Policies [Line Items]            
Term for payment and rate reduction   6 months        
Award vesting period (in years)   3 years        
Maximum            
Summary of Significant Accounting Policies [Line Items]            
Term for payment and rate reduction   12 months        
Award vesting period (in years)   5 years        
Options exercisable, weighted average remaining contractual term (in years)   10 years        
Stock Options and Restricted Stock | Minimum            
Summary of Significant Accounting Policies [Line Items]            
Award vesting period (in years)   2 years        
Stock Options and Restricted Stock | Maximum            
Summary of Significant Accounting Policies [Line Items]            
Award vesting period (in years)   5 years