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Loans Receivable - Schedule of Accounts, Notes, Loans, and Financing Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 12,737,292   $ 12,201,387      
Ratio of type of loan to total loans receivable 100.00%   100.00%      
Allowance for loan losses $ 128,666 $ 127,576 $ 123,073 $ 122,229 $ 121,922 $ 113,494
Loans in process 1,230,132   1,149,934      
Net deferred fees, costs and discounts 52,523   45,758      
Total loan contra accounts 1,411,321   1,318,765      
Net loans 11,325,971   10,882,622      
Single-family residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 5,745,598   $ 5,711,004      
Ratio of type of loan to total loans receivable 45.10%   46.80%      
Allowance for loan losses $ 34,401 34,144 $ 36,892 38,111 37,164 37,796
Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,885,034   $ 1,597,996      
Ratio of type of loan to total loans receivable 14.80%   13.10%      
Allowance for loan losses $ 30,133 27,389 $ 24,556 21,866 25,061 19,838
Construction - custom            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 612,688   $ 602,631      
Ratio of type of loan to total loans receivable 4.80%   4.90%      
Allowance for loan losses $ 2,014 2,081 $ 1,944 1,890 1,176 1,080
Land - acquisition & development            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 150,936   $ 124,308      
Ratio of type of loan to total loans receivable 1.20%   1.00%      
Allowance for loan losses $ 7,700 7,622 $ 6,829 7,217 6,669 6,023
Land - consumer lot loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 103,118   $ 104,405      
Ratio of type of loan to total loans receivable 0.80%   0.90%      
Allowance for loan losses $ 2,907 2,853 $ 2,649 2,548 2,513 2,535
Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,346,534   $ 1,303,148      
Ratio of type of loan to total loans receivable 10.60%   10.70%      
Allowance for loan losses $ 8,091 7,982 $ 7,862 7,912 7,929 6,925
Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,435,418   $ 1,434,610      
Ratio of type of loan to total loans receivable 11.30%   11.80%      
Allowance for loan losses $ 11,579 11,588 $ 11,818 11,347 10,772 8,588
Commercial & industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,133,075   $ 1,093,360      
Ratio of type of loan to total loans receivable 8.90%   9.00%      
Allowance for loan losses $ 27,515 29,330 $ 28,524 29,172 28,365 28,008
HELOC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 136,766   $ 144,850      
Ratio of type of loan to total loans receivable 1.10%   1.20%      
Allowance for loan losses $ 811 802 $ 855 877 826 813
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 188,125   $ 85,075      
Ratio of type of loan to total loans receivable 1.50%   0.70%      
Allowance for loan losses $ 3,515 $ 3,785 $ 1,144 $ 1,289 $ 1,447 $ 1,888