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Loans Receivable - Schedule of Accounts, Notes, Loans, and Financing Receivable (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 11,640,489   $ 10,950,608      
Ratio of type of loan to total loans receivable 100.00%   100.00%      
Allowance for loan losses $ 121,922 $ 118,456 $ 113,494 $ 109,919 $ 107,901 $ 106,829
Loans in process 1,009,937   879,484      
Net deferred fees, costs and discounts 45,608   46,710      
Total loan contra accounts 1,177,467   1,039,688      
Net loans 10,463,022   9,910,920      
Single-family residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 5,693,072   $ 5,658,830      
Ratio of type of loan to total loans receivable 48.90%   51.70%      
Allowance for loan losses $ 37,164 38,206 $ 37,796 41,828 47,756 47,347
Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,311,635   $ 1,110,411      
Ratio of type of loan to total loans receivable 11.30%   10.10%      
Allowance for loan losses $ 25,061 21,934 $ 19,838 15,726 7,014 6,680
Construction - custom            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 527,319   $ 473,069      
Ratio of type of loan to total loans receivable 4.50%   4.30%      
Allowance for loan losses $ 1,176 1,110 $ 1,080 1,022 1,062 990
Land - acquisition & development            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 118,726   $ 118,497      
Ratio of type of loan to total loans receivable 1.00%   1.10%      
Allowance for loan losses $ 6,669 6,665 $ 6,023 7,252 6,778 5,781
Land - consumer lot loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 101,227   $ 104,567      
Ratio of type of loan to total loans receivable 0.90%   1.00%      
Allowance for loan losses $ 2,513 2,501 $ 2,535 2,466 3,001 2,946
Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,266,911   $ 1,124,290      
Ratio of type of loan to total loans receivable 10.90%   10.30%      
Allowance for loan losses $ 7,929 7,629 $ 6,925 6,784 5,047 5,304
Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,296,039   $ 1,093,639      
Ratio of type of loan to total loans receivable 11.10%   10.00%      
Allowance for loan losses $ 10,772 10,168 $ 8,588 7,783 10,344 8,960
Commercial & industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,071,629   $ 978,589      
Ratio of type of loan to total loans receivable 9.20%   8.90%      
Allowance for loan losses $ 28,365 27,736 $ 28,008 23,824 24,096 24,980
HELOC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 146,172   $ 149,716      
Ratio of type of loan to total loans receivable 1.30%   1.40%      
Allowance for loan losses $ 826 832 $ 813 828 820 902
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 107,759   $ 139,000      
Ratio of type of loan to total loans receivable 0.90%   1.30%      
Allowance for loan losses $ 1,447 $ 1,675 $ 1,888 $ 2,406 $ 1,983 $ 2,939