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Summary of Significant Accounting Policies - Other Narrative (Details)
 12 Months Ended
Nov. 20, 2015
USD ($)
Sep. 30, 2015
USD ($)
payment
office
segment
part
shares
Sep. 30, 2014
USD ($)
shares
Sep. 30, 2013
USD ($)
shares
Summary of Significant Accounting Policies [Line Items]        
Number of offices (in offices) | office   247    
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    
Minimum performance period before move to accrual status   6 months    
Number of payments required | payment   6    
Number of parts in loss percentage factor | part   2    
Options outstanding that are not dilutive | shares   94,054 90,846 435,825
Number of reportable business segments | segment   1    
FDIC loss share receivable   $ 16,275,000 $ 36,860,000 $ 64,615,000
Payments of dividends   51,111,000 $ 42,065,000 $ 37,835,000
Subsequent Event        
Summary of Significant Accounting Policies [Line Items]        
Payments of dividends $ 12,035,000      
Interest rate swap agreements        
Summary of Significant Accounting Policies [Line Items]        
Impact to the statement of operations   $ 0    
Minimum        
Summary of Significant Accounting Policies [Line Items]        
Term for payment and rate reduction   6 months    
Maximum        
Summary of Significant Accounting Policies [Line Items]        
Term for payment and rate reduction   12 months