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Loans Receivable - Schedule of Accounts, Notes, Loans, and Financing Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 13,020,468 $ 12,853,678    
Ratio of type of loan to total loans receivable 100.00% 100.00%    
Allowance for loan losses $ 131,165 $ 129,257 $ 127,155 $ 123,073
Loans in process 1,138,308 1,195,506    
Net deferred fees, costs and discounts 50,756 51,834    
Total loan contra accounts 1,320,229 1,376,597    
Net loans 11,700,239 11,477,081    
Single-family residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 5,844,963 $ 5,798,966    
Ratio of type of loan to total loans receivable 44.90% 45.10%    
Allowance for loan losses $ 31,484 $ 33,033 35,928 36,892
Construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 1,841,674 $ 1,890,668    
Ratio of type of loan to total loans receivable 14.10% 14.70%    
Allowance for loan losses $ 31,463 $ 31,317 25,214 24,556
Construction - custom        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 607,071 $ 624,479    
Ratio of type of loan to total loans receivable 4.70% 4.90%    
Allowance for loan losses $ 1,926 $ 1,842 2,052 1,944
Land - acquisition & development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 181,323 $ 155,204    
Ratio of type of loan to total loans receivable 1.40% 1.20%    
Allowance for loan losses $ 9,156 $ 7,978 7,355 6,829
Land - consumer lot loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 100,563 $ 102,036    
Ratio of type of loan to total loans receivable 0.80% 0.80%    
Allowance for loan losses $ 2,144 $ 2,164 2,906 2,649
Multi-family        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 1,405,172 $ 1,385,125    
Ratio of type of loan to total loans receivable 10.80% 10.80%    
Allowance for loan losses $ 7,884 $ 8,329 7,904 7,862
Commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 1,526,887 $ 1,452,168    
Ratio of type of loan to total loans receivable 11.70% 11.30%    
Allowance for loan losses $ 12,711 $ 11,852 11,625 11,818
Commercial & industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 1,213,738 $ 1,140,874    
Ratio of type of loan to total loans receivable 9.30% 8.90%    
Allowance for loan losses $ 30,279 $ 28,702 29,268 28,524
HELOC        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 136,856 $ 130,852    
Ratio of type of loan to total loans receivable 1.10% 1.00%    
Allowance for loan losses $ 1,064 $ 781 808 855
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans receivable, gross $ 162,221 $ 173,306    
Ratio of type of loan to total loans receivable 1.20% 1.30%    
Allowance for loan losses $ 3,054 $ 3,259 $ 4,095 $ 1,144