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Loans Receivable - Schedule of Accounts, Notes, Loans, and Financing Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 10,572,201   $ 9,823,270      
Ratio of type of loan to total loans receivable 100.00%   100.00%      
Allowance for loan losses $ 111,016 $ 109,919 $ 106,829 $ 105,611 $ 108,323 $ 114,591
Loans in process 780,721   476,796      
Discount on acquired loans 14,775   30,095      
Deferred net origination fees 37,113   38,916      
Total loan contra accounts 943,625   652,636      
Net Loans 9,628,576   9,170,634      
Single-family residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses 40,681 41,828 47,347 52,004 54,762 62,763
Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses 17,662 15,726 6,680 5,933 5,445 6,742
Construction - custom            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses 1,028 1,022 990 985 968 1,695
Land - acquisition & development            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses 6,722 7,252 5,781 5,772 7,405 5,592
Land - consumer lot loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses 2,504 2,466 2,946 2,999 3,035 3,077
Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses 6,921 6,784 5,304 5,035 4,673 4,248
Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses 8,143 7,783 8,960 7,268 6,734 7,548
Commercial & industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses 24,396 23,824 24,980 21,662 21,146 16,527
HELOC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses 856 828 902 864 850 928
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses 2,103 $ 2,406 2,939 $ 3,089 $ 3,305 $ 3,227
Non-Acquired loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 10,303,150   $ 9,493,987      
Ratio of type of loan to total loans receivable 97.50%   96.80%      
Non-Acquired loans | Single-family residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 5,593,018   $ 5,651,845      
Ratio of type of loan to total loans receivable 52.90%   57.60%      
Non-Acquired loans | Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,016,305   $ 200,509      
Ratio of type of loan to total loans receivable 9.60%   2.00%      
Non-Acquired loans | Construction - custom            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 409,116   $ 396,307      
Ratio of type of loan to total loans receivable 3.90%   4.00%      
Non-Acquired loans | Land - acquisition & development            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 101,849   $ 94,208      
Ratio of type of loan to total loans receivable 1.00%   1.00%      
Non-Acquired loans | Land - consumer lot loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 101,731   $ 103,989      
Ratio of type of loan to total loans receivable 1.00%   1.10%      
Non-Acquired loans | Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,094,736   $ 1,125,722      
Ratio of type of loan to total loans receivable 10.30%   11.60%      
Non-Acquired loans | Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 886,957   $ 986,270      
Ratio of type of loan to total loans receivable 8.40%   10.00%      
Non-Acquired loans | Commercial & industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 810,442   $ 612,836      
Ratio of type of loan to total loans receivable 7.70%   6.20%      
Non-Acquired loans | HELOC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 134,735   $ 127,646      
Ratio of type of loan to total loans receivable 1.30%   1.30%      
Non-Acquired loans | Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 154,261   $ 194,655      
Ratio of type of loan to total loans receivable 1.40%   2.00%      
Acquired loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 140,369   $ 166,293      
Ratio of type of loan to total loans receivable 1.30%   1.60%      
Credit impaired acquired loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 96,491   $ 87,081      
Ratio of type of loan to total loans receivable 0.90%   0.90%      
Covered loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 32,191   $ 75,909      
Ratio of type of loan to total loans receivable 0.30%   0.70%