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Loans Receivable - Schedule of Accounts, Notes, Loans, and Financing Receivable (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 10,306,673   $ 9,823,270      
Ratio of type of loan to total loans receivable 100.00%   100.00%      
Allowance for probable losses $ 109,919 $ 107,901 $ 106,829 $ 108,323 $ 108,700 $ 114,591
Loans in process 591,667   476,796      
Discount on acquired loans 21,120   30,095      
Deferred net origination fees 38,645   38,916      
Charges against loans receivable 761,351   652,636      
Loans receivable, net 9,545,322   9,170,634      
Single-family residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for probable losses 41,828 47,756 47,347 54,762 55,495 62,763
Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for probable losses 15,726 7,014 6,680 5,445 5,451 6,742
Construction - custom            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for probable losses 1,022 1,062 990 968 965 1,695
Land - acquisition & development            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for probable losses 7,252 6,778 5,781 7,405 6,671 5,592
Land - consumer lot loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for probable losses 2,466 3,001 2,946 3,035 3,113 3,077
Multi-family            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for probable losses 6,784 5,047 5,304 4,673 4,500 4,248
Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for probable losses 7,783 10,344 8,960 6,734 5,872 7,548
Commercial & industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for probable losses 23,824 24,096 24,980 21,146 23,328 16,527
HELOC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for probable losses 828 820 902 850 892 928
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for probable losses 2,406 $ 1,983 2,939 $ 3,305 $ 2,413 $ 3,227
Non-Acquired loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 10,013,253   $ 9,493,987      
Ratio of type of loan to total loans receivable 97.20%   96.80%      
Non-Acquired loans | Single-family residential            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 5,618,954   $ 5,651,845      
Ratio of type of loan to total loans receivable 54.50%   57.60%      
Non-Acquired loans | Construction            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 785,846   $ 200,509      
Ratio of type of loan to total loans receivable 7.60%   2.00%      
Non-Acquired loans | Construction - custom            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 398,797   $ 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 $ 101,605   $ 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 $ 100,856   $ 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 $ 1,073,222   $ 1,125,722      
Ratio of type of loan to total loans receivable 10.40%   11.60%      
Non-Acquired loans | Commercial real estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 833,570   $ 986,270      
Ratio of type of loan to total loans receivable 8.10%   10.00%      
Non-Acquired loans | Commercial & industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 805,272   $ 612,836      
Ratio of type of loan to total loans receivable 7.80%   6.20%      
Non-Acquired loans | HELOC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 130,459   $ 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 $ 164,672   $ 194,655      
Ratio of type of loan to total loans receivable 1.60%   2.00%      
Acquired loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 152,572   $ 166,293      
Ratio of type of loan to total loans receivable 1.50%   1.60%      
Credit impaired acquired loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 106,637   $ 87,081      
Ratio of type of loan to total loans receivable 1.00%   0.90%      
Covered loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 34,211   $ 75,909      
Ratio of type of loan to total loans receivable 0.30%   0.70%