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Loans Receivable - Schedule of Loans Receivable (including Covered Loans) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 12,201,387 $ 10,950,608  
Ratio of type of loan to total loans receivable 100.00% 100.00%  
Allowance for probable losses $ 123,073 $ 113,494 $ 106,829
Loans in process 1,149,934 879,484  
Net deferred fees, costs and discounts 45,758 46,710  
Total loan contra accounts 1,318,765 1,039,688  
Net loans 10,882,622 9,910,920  
Single-family residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 5,711,004 $ 5,658,830  
Ratio of type of loan to total loans receivable 46.80% 51.70%  
Allowance for probable losses $ 36,892 $ 37,796 47,347
Construction - speculative      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 1,597,996 $ 1,110,411  
Ratio of type of loan to total loans receivable 13.10% 10.10%  
Construction - custom      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 602,631 $ 473,069  
Ratio of type of loan to total loans receivable 4.90% 4.30%  
Allowance for probable losses $ 1,944 $ 1,080 990
Land - acquisition & development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 124,308 $ 118,497  
Ratio of type of loan to total loans receivable 1.00% 1.10%  
Allowance for probable losses $ 6,829 $ 6,023 5,781
Land - consumer lot loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 104,405 $ 104,567  
Ratio of type of loan to total loans receivable 0.90% 1.00%  
Allowance for probable losses $ 2,649 $ 2,535 2,946
Multi-family      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 1,303,148 $ 1,124,290  
Ratio of type of loan to total loans receivable 10.70% 10.30%  
Allowance for probable losses $ 7,862 $ 6,925 5,304
Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 1,434,610 $ 1,093,639  
Ratio of type of loan to total loans receivable 11.80% 10.00%  
Allowance for probable losses $ 11,818 $ 8,588 8,960
Commercial & industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 1,093,360 $ 978,589  
Ratio of type of loan to total loans receivable 9.00% 8.90%  
Allowance for probable losses $ 28,524 $ 28,008 24,980
HELOC      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 144,850 $ 149,716  
Ratio of type of loan to total loans receivable 1.20% 1.40%  
Allowance for probable losses $ 855 $ 813 902
Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 85,075 $ 139,000  
Ratio of type of loan to total loans receivable 0.70% 1.30%  
Allowance for probable losses $ 1,144 $ 1,888 $ 2,939