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Loans Receivable - Schedule of Accounts, Notes, Loans, and Financing Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 11,877,546   $ 10,950,608      
Ratio of type of loan to total loans receivable 100.00%   100.00%      
Allowance for loan losses $ 122,229 $ 121,922 $ 113,494 $ 111,016 $ 109,919 $ 106,829
Loans in process 1,054,513   879,484      
Net deferred fees, costs and discounts 46,379   46,710      
Total loan contra accounts 1,223,121   1,039,688      
Net loans 10,654,425   9,910,920      
Single-family residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 5,687,850   $ 5,658,830      
Ratio of type of loan to total loans receivable 47.90%   51.70%      
Allowance for loan losses $ 38,111 37,164 $ 37,796 40,681 41,828 47,347
Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,436,874   $ 1,110,411      
Ratio of type of loan to total loans receivable 12.10%   10.10%      
Allowance for loan losses $ 21,866 25,061 $ 19,838 17,662 15,726 6,680
Construction - custom            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 561,260   $ 473,069      
Ratio of type of loan to total loans receivable 4.70%   4.30%      
Allowance for loan losses $ 1,890 1,176 $ 1,080 1,028 1,022 990
Land - acquisition & development            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 119,524   $ 118,497      
Ratio of type of loan to total loans receivable 1.00%   1.10%      
Allowance for loan losses $ 7,217 6,669 $ 6,023 6,722 7,252 5,781
Land - consumer lot loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 101,626   $ 104,567      
Ratio of type of loan to total loans receivable 0.90%   1.00%      
Allowance for loan losses $ 2,548 2,513 $ 2,535 2,504 2,466 2,946
Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,263,187   $ 1,124,290      
Ratio of type of loan to total loans receivable 10.60%   10.30%      
Allowance for loan losses $ 7,912 7,929 $ 6,925 6,921 6,784 5,304
Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,346,006   $ 1,093,639      
Ratio of type of loan to total loans receivable 11.30%   10.00%      
Allowance for loan losses $ 11,347 10,772 $ 8,588 8,143 7,783 8,960
Commercial & industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,116,860   $ 978,589      
Ratio of type of loan to total loans receivable 9.40%   8.90%      
Allowance for loan losses $ 29,172 28,365 $ 28,008 24,396 23,824 24,980
HELOC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 148,584   $ 149,716      
Ratio of type of loan to total loans receivable 1.30%   1.40%      
Allowance for loan losses $ 877 826 $ 813 856 828 902
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 95,775   $ 139,000      
Ratio of type of loan to total loans receivable 0.80%   1.30%      
Allowance for loan losses $ 1,289 $ 1,447 $ 1,888 $ 2,103 $ 2,406 $ 2,939