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Loans Receivable (excluding Covered Loans) - Schedule of Accounts, Notes, Loans, and Financing Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 9,256,701   $ 8,669,717      
Ratio of type of loan to total loans receivable 100.00%   100.00%      
Allowance for probable losses $ 105,611 $ 108,323 $ 112,347 $ 114,150 $ 114,931 $ 116,741
Loans in process 438,941   346,172      
Discount on acquired loans 28,399   25,391      
Deferred net origination fees 38,141   37,485      
Charges against loans receivable 611,092   521,395      
Loans receivable, net 8,645,609   8,148,322      
Single-Family Residential [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 5,568,929   $ 5,572,244      
Ratio of type of loan to total loans receivable 60.30%   64.20%      
Allowance for probable losses $ 52,004 54,762 $ 62,763 62,360 63,348 64,184
Construction - Speculative [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 181,668   $ 140,060      
Ratio of type of loan to total loans receivable 2.00%   1.60%      
Allowance for probable losses $ 5,933 5,445 $ 6,742 6,387 6,773 8,407
Construction - Custom [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 375,425   $ 385,824      
Ratio of type of loan to total loans receivable 4.10%   4.50%      
Allowance for probable losses $ 985 968 $ 1,695 1,678 1,599 882
Land - Acquisition & Development [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 90,252   $ 80,359      
Ratio of type of loan to total loans receivable 0.90%   0.90%      
Allowance for probable losses $ 5,772 7,405 $ 5,592 6,955 6,027 9,165
Land - Consumer Lot Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 105,463   $ 111,130      
Ratio of type of loan to total loans receivable 1.10%   1.30%      
Allowance for probable losses $ 2,999 3,035 $ 3,077 2,862 2,974 3,552
Multi-Family [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,093,374   $ 920,285      
Ratio of type of loan to total loans receivable 11.80%   10.60%      
Allowance for probable losses $ 5,035 4,673 $ 4,248 4,141 4,187 3,816
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 981,824   $ 752,957      
Ratio of type of loan to total loans receivable 10.60%   8.70%      
Allowance for probable losses $ 7,268 6,734 $ 7,548 6,689 5,924 5,595
Commercial & Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 512,973   $ 434,088      
Ratio of type of loan to total loans receivable 5.50%   5.00%      
Allowance for probable losses $ 21,662 21,146 $ 16,527 18,696 20,403 16,614
HELOC [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 137,837   $ 134,455      
Ratio of type of loan to total loans receivable 1.50%   1.60%      
Allowance for probable losses $ 864 850 $ 928 1,015 975 1,002
Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 208,956   $ 138,315      
Ratio of type of loan to total loans receivable 2.20%   1.60%      
Allowance for probable losses $ 3,089 $ 3,305 $ 3,227 $ 3,367 $ 2,721 $ 3,524
Non-Acquired Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 8,975,217   $ 8,409,022      
Ratio of type of loan to total loans receivable 97.10%   97.20%      
Non-Acquired Loans [Member] | Single-Family Residential [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 5,549,746   $ 5,560,203      
Ratio of type of loan to total loans receivable 60.10%   64.10%      
Non-Acquired Loans [Member] | Construction - Speculative [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 181,668   $ 140,060      
Ratio of type of loan to total loans receivable 2.00%   1.60%      
Non-Acquired Loans [Member] | Construction - Custom [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 375,425   $ 385,824      
Ratio of type of loan to total loans receivable 4.10%   4.50%      
Non-Acquired Loans [Member] | Land - Acquisition & Development [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 87,382   $ 77,832      
Ratio of type of loan to total loans receivable 0.90%   0.90%      
Non-Acquired Loans [Member] | Land - Consumer Lot Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 102,495   $ 108,623      
Ratio of type of loan to total loans receivable 1.10%   1.30%      
Non-Acquired Loans [Member] | Multi-Family [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,089,682   $ 917,286      
Ratio of type of loan to total loans receivable 11.80%   10.60%      
Non-Acquired Loans [Member] | Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 808,539   $ 591,336      
Ratio of type of loan to total loans receivable 8.70%   6.90%      
Non-Acquired Loans [Member] | Commercial & Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 451,478   $ 379,226      
Ratio of type of loan to total loans receivable 4.90%   4.40%      
Non-Acquired Loans [Member] | HELOC [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 122,870   $ 116,042      
Ratio of type of loan to total loans receivable 1.30%   1.40%      
Non-Acquired Loans [Member] | Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 205,932   $ 132,590      
Ratio of type of loan to total loans receivable 2.20%   1.50%      
Acquired Non-Impaired Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 189,120   $ 181,355      
Ratio of type of loan to total loans receivable 1.90%   2.00%      
Acquired Non-Impaired Loans [Member] | Single-Family Residential [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 12,895   $ 11,716      
Ratio of type of loan to total loans receivable 0.10%   0.10%      
Acquired Non-Impaired Loans [Member] | Construction - Speculative [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 0   $ 0      
Ratio of type of loan to total loans receivable 0.00%   0.00%      
Acquired Non-Impaired Loans [Member] | Construction - Custom [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 0   $ 0      
Ratio of type of loan to total loans receivable 0.00%   0.00%      
Acquired Non-Impaired Loans [Member] | Land - Acquisition & Development [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,028   $ 905      
Ratio of type of loan to total loans receivable 0.00%   0.00%      
Acquired Non-Impaired Loans [Member] | Land - Consumer Lot Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 2,472   $ 2,507      
Ratio of type of loan to total loans receivable 0.00%   0.00%      
Acquired Non-Impaired Loans [Member] | Multi-Family [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 3,692   $ 2,999      
Ratio of type of loan to total loans receivable 0.00%   0.00%      
Acquired Non-Impaired Loans [Member] | Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 102,089   $ 97,898      
Ratio of type of loan to total loans receivable 1.10%   1.10%      
Acquired Non-Impaired Loans [Member] | Commercial & Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 57,614   $ 51,386      
Ratio of type of loan to total loans receivable 0.60%   0.60%      
Acquired Non-Impaired Loans [Member] | HELOC [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 6,414   $ 8,274      
Ratio of type of loan to total loans receivable 0.10%   0.10%      
Acquired Non-Impaired Loans [Member] | Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 2,916   $ 5,670      
Ratio of type of loan to total loans receivable 0.00%   0.10%      
Credit Impaired Acquired Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 92,364   $ 79,340      
Ratio of type of loan to total loans receivable 1.00%   0.80%      
Credit Impaired Acquired Loans [Member] | Single-Family Residential [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 6,288   $ 325      
Ratio of type of loan to total loans receivable 0.10%   0.00%      
Credit Impaired Acquired Loans [Member] | Construction - Speculative [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 0   $ 0      
Ratio of type of loan to total loans receivable 0.00%   0.00%      
Credit Impaired Acquired Loans [Member] | Land - Acquisition & Development [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 1,842   $ 1,622      
Ratio of type of loan to total loans receivable 0.00%   0.00%      
Credit Impaired Acquired Loans [Member] | Land - Consumer Lot Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 496   $ 0      
Ratio of type of loan to total loans receivable 0.00%   0.00%      
Credit Impaired Acquired Loans [Member] | Multi-Family [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 0   $ 0      
Ratio of type of loan to total loans receivable 0.00%   0.00%      
Credit Impaired Acquired Loans [Member] | Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 71,196   $ 63,723      
Ratio of type of loan to total loans receivable 0.80%   0.70%      
Credit Impaired Acquired Loans [Member] | Commercial & Industrial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 3,881   $ 3,476      
Ratio of type of loan to total loans receivable 0.00%   0.00%      
Credit Impaired Acquired Loans [Member] | HELOC [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 8,553   $ 10,139      
Ratio of type of loan to total loans receivable 0.10%   0.10%      
Credit Impaired Acquired Loans [Member] | Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable, gross $ 108   $ 55      
Ratio of type of loan to total loans receivable 0.00%   0.00%