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Loans Receivable - Schedule of Accounts, Notes, Loans, and Financing Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 10,110,184 $ 9,823,270  
Ratio of type of loan to total loans receivable 100.00% 100.00%  
Allowance for probable losses $ 107,901 $ 106,829 $ 114,591
Loans in process 535,850 476,796  
Discount on acquired loans 25,040 30,095  
Deferred net origination fees 38,663 38,916  
Charges against loans receivable 707,454 652,636  
Loans receivable, net 9,402,730 9,170,634  
Single-family residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for probable losses 47,756 47,347 62,763
Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for probable losses 7,014 6,680 6,742
Construction - custom      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for probable losses 1,062 990 1,695
Land - acquisition & development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for probable losses 6,778 5,781 5,592
Land - consumer lot loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for probable losses 3,001 2,946 3,077
Multi-family      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for probable losses 5,047 5,304 4,248
Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for probable losses 10,344 8,960 7,548
Commercial & industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for probable losses 24,096 24,980 16,527
HELOC      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for probable losses 820 902 928
Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for probable losses 1,983 2,939 $ 3,227
Non-Acquired loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 9,791,190 $ 9,493,987  
Ratio of type of loan to total loans receivable 96.90% 96.60%  
Non-Acquired loans | Single-family residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 5,629,715 $ 5,651,845  
Ratio of type of loan to total loans receivable 55.70% 57.50%  
Non-Acquired loans | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 660,238 $ 200,509  
Ratio of type of loan to total loans receivable 6.50% 2.00%  
Non-Acquired loans | Construction - custom      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 404,849 $ 396,307  
Ratio of type of loan to total loans receivable 4.00% 4.00%  
Non-Acquired loans | Land - acquisition & development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 97,025 $ 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 $ 102,376 $ 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 $ 997,696 $ 1,125,722  
Ratio of type of loan to total loans receivable 9.90% 11.50%  
Non-Acquired loans | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 839,157 $ 986,270  
Ratio of type of loan to total loans receivable 8.30% 10.00%  
Non-Acquired loans | Commercial & industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 751,073 $ 612,836  
Ratio of type of loan to total loans receivable 7.40% 6.20%  
Non-Acquired loans | HELOC      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 127,919 $ 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 $ 181,142 $ 194,655  
Ratio of type of loan to total loans receivable 1.80% 2.00%  
Acquired loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 164,380 $ 166,293  
Ratio of type of loan to total loans receivable 1.60% 1.70%  
Credit impaired acquired loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 116,030 $ 87,081  
Ratio of type of loan to total loans receivable 1.10% 0.90%  
Covered loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, gross $ 38,584 $ 75,909  
Ratio of type of loan to total loans receivable 0.40% 0.80%