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Loans Receivable - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual interest income recognized $ 753    
Impaired, interest lost on nonaccrual loans $ 547    
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.74%   0.68%
Percent of TDRs classified as performing 94.20%    
Troubled debt restructuring, amount $ 2,566 $ 1,694  
Basis point reduction, minimum 1.00%    
Basis point reduction, maximum 2.00%    
Single family residential loans as percentage of restructured loans 87.20%    
Loans receivable, gross $ 11,328,633   $ 10,950,608
Single family residential coverage term (in years) 4 years    
Covered loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 26,691   $ 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 $ 249,950