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Loans Receivable - Schedule of Loans Receivable (including Covered Loans) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 12,853,678 $ 12,201,387  
Ratio of type of loan to total loans receivable 100.00% 100.00%  
Allowance for probable losses $ 129,257 $ 123,073 $ 113,494
Loans in process 1,195,506 1,149,934  
Net deferred fees, costs and discounts 51,834 45,758  
Total loan contra accounts 1,376,597 1,318,765  
Net loans 11,477,081 10,882,622  
Single-family residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 5,798,966 $ 5,711,004  
Ratio of type of loan to total loans receivable 45.10% 46.80%  
Allowance for probable losses $ 33,033 $ 36,892 37,796
Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 1,890,668 $ 1,597,996  
Ratio of type of loan to total loans receivable 14.70% 13.10%  
Allowance for probable losses $ 31,317 $ 24,556 19,838
Construction - custom      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 624,479 $ 602,631  
Ratio of type of loan to total loans receivable 4.90% 4.90%  
Allowance for probable losses $ 1,842 $ 1,944 1,080
Land - acquisition & development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 155,204 $ 124,308  
Ratio of type of loan to total loans receivable 1.20% 1.00%  
Allowance for probable losses $ 7,978 $ 6,829 6,023
Land - consumer lot loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 102,036 $ 104,405  
Ratio of type of loan to total loans receivable 0.80% 0.90%  
Allowance for probable losses $ 2,164 $ 2,649 2,535
Multi-family      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 1,385,125 $ 1,303,148  
Ratio of type of loan to total loans receivable 10.80% 10.70%  
Allowance for probable losses $ 8,329 $ 7,862 6,925
Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 1,452,168 $ 1,434,610  
Ratio of type of loan to total loans receivable 11.30% 11.80%  
Allowance for probable losses $ 11,852 $ 11,818 8,588
Commercial & industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 1,140,874 $ 1,093,360  
Ratio of type of loan to total loans receivable 8.90% 9.00%  
Allowance for probable losses $ 28,702 $ 28,524 28,008
HELOC      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 130,852 $ 144,850  
Ratio of type of loan to total loans receivable 1.00% 1.20%  
Allowance for probable losses $ 781 $ 855 813
Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 173,306 $ 85,075  
Ratio of type of loan to total loans receivable 1.30% 0.70%  
Allowance for probable losses $ 3,259 $ 1,144 $ 1,888