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Summary of Significant Accounting Policies - Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Oct. 29, 2019
$ / shares
Sep. 30, 2019
USD ($)
payment
segment
part
branch
Sep. 30, 2018
USD ($)
Summary of Significant Accounting Policies [Line Items]      
Number of offices | branch   234  
Cash collateral   $ 31,850 $ 18,000
Loans in process   $ 1,201,341 1,195,506
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 parts in loss percentage factor | part   2  
Options exercisable, weighted average remaining contractual term (in years)   1 year 4 months 24 days  
Number of reportable business segments | segment   1  
Subsequent Event      
Summary of Significant Accounting Policies [Line Items]      
Dividends declared (in dollars per share) | $ / shares $ 0.21    
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  
Loans and Leases Receivable      
Summary of Significant Accounting Policies [Line Items]      
Loans in process   $ 2,379,089 $ 2,180,162