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Loans Receivable - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2016
Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Nonaccrual loans by portfolio segment     $ 4,100      
Impaired, interest lost on nonaccrual loans     $ 1,865      
Ratio of past due loans to total loans, net of charge-offs and LIPs 0.73%   0.73%   0.90% 0.88%
Percent of TDRs classified as performing     96.00%      
Troubled debt restructuring, amount $ 3,050 $ 1,814 $ 5,845 $ 19,308    
Basis point reduction, minimum     1.00%      
Basis point reduction, maximum     2.00%      
Single family residential loans as percentage of restructured loans 86.70%   86.70%      
Loans receivable, gross $ 10,572,201   $ 10,572,201     $ 9,823,270
Covered loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Ratio of past due loans to total loans, net of charge-offs and LIPs 2.26%   2.26%     6.80%
Loans receivable, gross $ 32,191   $ 32,191     $ 75,909
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     $ 258,135