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Loans Receivable - Schedule of Accounts, Notes, Loans, and Financing Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 12,456,216 $ 12,201,387    
Ratio of type of loan to total loans receivable 100.00% 100.00%    
Allowance for loan losses $ 127,155 $ 123,073 $ 118,456 $ 113,494
Loans in process 1,175,642 1,149,934    
Net deferred fees, costs and discounts 46,377 45,758    
Total loan contra accounts 1,349,174 1,318,765    
Net loans 11,107,042 10,882,622    
Single-family residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 5,693,318 $ 5,711,004    
Ratio of type of loan to total loans receivable 45.70% 46.80%    
Allowance for loan losses $ 35,928 $ 36,892 38,206 37,796
Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 1,710,418 $ 1,597,996    
Ratio of type of loan to total loans receivable 13.70% 13.10%    
Allowance for loan losses $ 25,214 $ 24,556 21,934 19,838
Construction - custom        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 583,580 $ 602,631    
Ratio of type of loan to total loans receivable 4.70% 4.90%    
Allowance for loan losses $ 2,052 $ 1,944 1,110 1,080
Land - acquisition & development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 136,938 $ 124,308    
Ratio of type of loan to total loans receivable 1.10% 1.00%    
Allowance for loan losses $ 7,355 $ 6,829 6,665 6,023
Land - consumer lot loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 105,086 $ 104,405    
Ratio of type of loan to total loans receivable 0.80% 0.90%    
Allowance for loan losses $ 2,906 $ 2,649 2,501 2,535
Multi-family        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 1,312,695 $ 1,303,148    
Ratio of type of loan to total loans receivable 10.50% 10.70%    
Allowance for loan losses $ 7,904 $ 7,862 7,629 6,925
Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 1,436,508 $ 1,434,610    
Ratio of type of loan to total loans receivable 11.50% 11.80%    
Allowance for loan losses $ 11,625 $ 11,818 10,168 8,588
Commercial & industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 1,120,707 $ 1,093,360    
Ratio of type of loan to total loans receivable 9.00% 9.00%    
Allowance for loan losses $ 29,268 $ 28,524 27,736 28,008
HELOC        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 136,995 $ 144,850    
Ratio of type of loan to total loans receivable 1.10% 1.20%    
Allowance for loan losses $ 808 $ 855 832 813
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 219,971 $ 85,075    
Ratio of type of loan to total loans receivable 1.80% 0.70%    
Allowance for loan losses $ 4,095 $ 1,144 $ 1,675 $ 1,888