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Allowance for Losses on Loans - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Reversal of loan losses $ 0 $ 5,500    
Charge-offs, net of (recoveries) (1,072) $ (842)    
Loans receivable, gross 10,110,184   $ 9,823,270  
Nonaccrual of interest $ 56,748   $ 67,810  
Nonaccrual of interest, percent increase (decrease) (42.30%)      
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.98% 1.47% 0.88%  
Allowance for probable losses $ 107,901   $ 106,829 $ 114,591
Allowance for credit losses and reserve for unfunded commitments $ 110,986      
Allowance for credit losses and reserve for unfunded commitments, percent of gross loans 1.10%      
Acquired loans subject to general allowance $ 25,223      
Unfunded Loan Commitment        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for probable losses 3,085   3,085  
Single-family residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Nonaccrual of interest 43,856   59,074  
Allowance for probable losses 47,756   47,347 $ 62,763
Loans Collectively Evaluated for Impairment        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross 9,232,046   8,963,453  
Allowance for probable losses 107,771   106,554  
Loans Collectively Evaluated for Impairment | Single-family residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross 5,614,580   5,595,752  
Allowance for probable losses 47,625   47,073  
Loans Individually Evaluated for Impairment        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross 49,067   85,513  
Allowance for probable losses 130   275  
Loans Individually Evaluated for Impairment | Single-family residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross 14,206   51,718  
Allowance for probable losses 130   275  
Non-Performing Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 98,846 $ 164,317    
Ratio of non-performing assets to total assets 0.67% 1.13%    
Nonaccrual of interest $ 56,748 $ 98,353 67,810  
Non-Performing Loans | Single-family residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Nonaccrual of interest $ 43,856   $ 59,074