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Loans Receivable - Schedule of Accounts, Notes, Loans, and Financing Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 13,304,743   $ 12,853,678      
Ratio of type of loan to total loans receivable 100.00%   100.00%      
Allowance for loan losses $ 134,022 $ 133,086 $ 129,257 $ 128,666 $ 127,576 $ 123,073
Loans in process 1,148,876   1,195,506      
Net deferred fees, costs and discounts 47,312   51,834      
Total loan contra accounts 1,330,210   1,376,597      
Net loans 11,974,533   11,477,081      
Single-family residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 5,873,583   $ 5,798,966      
Ratio of type of loan to total loans receivable 44.10%   45.10%      
Allowance for loan losses $ 31,514 31,476 $ 33,033 34,401 34,144 36,892
Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,997,236   $ 1,890,668      
Ratio of type of loan to total loans receivable 15.00%   14.70%      
Allowance for loan losses $ 34,057 33,396 $ 31,317 30,133 27,389 24,556
Construction - custom            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 570,897   $ 624,479      
Ratio of type of loan to total loans receivable 4.30%   4.90%      
Allowance for loan losses $ 1,884 1,976 $ 1,842 2,014 2,081 1,944
Land - acquisition & development            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 203,086   $ 155,204      
Ratio of type of loan to total loans receivable 1.50%   1.20%      
Allowance for loan losses $ 9,388 9,734 $ 7,978 7,700 7,622 6,829
Land - consumer lot loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 95,227   $ 102,036      
Ratio of type of loan to total loans receivable 0.70%   0.80%      
Allowance for loan losses $ 2,032 2,076 $ 2,164 2,907 2,853 2,649
Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,403,142   $ 1,385,125      
Ratio of type of loan to total loans receivable 10.50%   10.80%      
Allowance for loan losses $ 7,283 7,394 $ 8,329 8,091 7,982 7,862
Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,622,943   $ 1,452,168      
Ratio of type of loan to total loans receivable 12.20%   11.30%      
Allowance for loan losses $ 13,004 12,448 $ 11,852 11,579 11,588 11,818
Commercial & industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,256,398   $ 1,140,874      
Ratio of type of loan to total loans receivable 9.40%   8.90%      
Allowance for loan losses $ 31,071 30,574 $ 28,702 27,515 29,330 28,524
HELOC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 139,914   $ 130,852      
Ratio of type of loan to total loans receivable 1.00%   1.00%      
Allowance for loan losses $ 1,087 1,082 $ 781 811 802 855
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 142,317   $ 173,306      
Ratio of type of loan to total loans receivable 1.10%   1.30%      
Allowance for loan losses $ 2,702 $ 2,930 $ 3,259 $ 3,515 $ 3,785 $ 1,144