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Loans Receivable - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Nonaccrual interest income recognized     $ 4,721    
Impaired, interest lost on nonaccrual loans     $ 1,727    
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.50%   0.50%   0.68%
Percent of TDRs classified as performing     96.30%    
Troubled debt restructuring, amount $ 1,836 $ 3,050 $ 6,114 $ 5,845  
Basis point reduction, minimum     1.00%    
Basis point reduction, maximum     2.00%    
Single family residential loans as percentage of restructured loans 88.00%   88.00%    
Loans receivable, gross $ 11,877,546   $ 11,877,546   $ 10,950,608
Single family residential coverage term (in years)     3 years    
Covered loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, gross $ 23,094   $ 23,094   $ 28,974
Minimum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Term for payment and rate reduction     6 months    
Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Term for payment and rate reduction     24 months    
Performing Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Troubled debt restructuring, amount     $ 223,558