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Allowance for Losses on Loans - Loans Collectively and Individually Evaluated for Impairment (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 106,829 $ 114,591 $ 116,741
Gross loans subject to general/specific reserve 9,823,270 8,882,920  
Single-family residential      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation 47,347 62,763 64,184
Gross loans subject to general/specific reserve 5,700,782    
Construction - speculative      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation 6,680 6,742 8,407
Gross loans subject to general/specific reserve 200,508    
Construction - custom      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation 990 1,695 882
Gross loans subject to general/specific reserve 396,309    
Land - acquisition & development      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation 5,781 5,592 9,165
Gross loans subject to general/specific reserve 98,282    
Land - consumer lot loans      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation 2,946 3,077 3,552
Gross loans subject to general/specific reserve 106,813    
Multi-family      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation 5,304 4,248 3,816
Gross loans subject to general/specific reserve 1,129,437    
Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation 8,960 7,548 5,595
Gross loans subject to general/specific reserve 1,186,551    
Commercial & industrial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation 24,980 16,527 16,614
Gross loans subject to general/specific reserve 657,580    
HELOC      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation 902 928 1,002
Gross loans subject to general/specific reserve 149,527    
Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation 2,939 3,227 $ 3,524
Gross loans subject to general/specific reserve 197,481    
Loans Collectively Evaluated for Impairment      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation 106,554 112,287  
Gross loans subject to general/specific reserve $ 8,963,453 [1] $ 8,316,874 [2]  
Ratio 1.20% 1.40%  
Loans Collectively Evaluated for Impairment | Single-family residential      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 47,073 $ 62,067  
Gross loans subject to general/specific reserve $ 5,595,752 [1] $ 5,487,331 [2]  
Ratio 0.80% 1.10%  
Loans Collectively Evaluated for Impairment | Construction - speculative      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 6,680 $ 6,682  
Gross loans subject to general/specific reserve $ 124,679 [1] $ 130,901 [2]  
Ratio 5.40% 5.50%  
Loans Collectively Evaluated for Impairment | Construction - custom      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 990 $ 1,695  
Gross loans subject to general/specific reserve $ 205,692 [1] $ 385,464 [2]  
Ratio 0.50% 0.50%  
Loans Collectively Evaluated for Impairment | Land - acquisition & development      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 5,781 $ 5,592  
Gross loans subject to general/specific reserve $ 72,602 [1] $ 73,999 [2]  
Ratio 8.00% 7.60%  
Loans Collectively Evaluated for Impairment | Land - consumer lot loans      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 2,946 $ 3,077  
Gross loans subject to general/specific reserve $ 93,103 [1] $ 95,684 [2]  
Ratio 3.20% 3.20%  
Loans Collectively Evaluated for Impairment | Multi-family      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 5,304 $ 4,248  
Gross loans subject to general/specific reserve $ 1,062,194 [1] $ 911,162 [2]  
Ratio 0.50% 0.50%  
Loans Collectively Evaluated for Impairment | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 8,960 $ 7,548  
Gross loans subject to general/specific reserve $ 844,691 [1] $ 563,534 [2]  
Ratio 1.10% 1.40%  
Loans Collectively Evaluated for Impairment | Commercial & industrial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 24,980 $ 17,223  
Gross loans subject to general/specific reserve $ 643,577 [1] $ 421,816 [2]  
Ratio 3.90% 4.60%  
Loans Collectively Evaluated for Impairment | HELOC      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 902 $ 928  
Gross loans subject to general/specific reserve $ 126,594 [1] $ 114,393 [2]  
Ratio 0.70% 0.90%  
Loans Collectively Evaluated for Impairment | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 2,938 $ 3,227  
Gross loans subject to general/specific reserve $ 194,569 [1] $ 132,590 [2]  
Ratio 1.50% 2.40%  
Loans Individually Evaluated for Impairment      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 275 $ 60  
Gross loans subject to general/specific reserve $ 85,513 [1] $ 134,736 [2]  
Ratio 0.30% 0.00%  
Loans Individually Evaluated for Impairment | Single-family residential      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 275 $ 0  
Gross loans subject to general/specific reserve $ 51,718 [1] $ 72,869 [2]  
Ratio 0.50% 0.00%  
Loans Individually Evaluated for Impairment | Construction - speculative      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 0 $ 60  
Gross loans subject to general/specific reserve $ 5,441 [1] $ 9,159 [2]  
Ratio 0.00% 0.70%  
Loans Individually Evaluated for Impairment | Construction - custom      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 0 $ 0  
Gross loans subject to general/specific reserve $ 0 [1] $ 360 [2]  
Ratio 0.00% 0.00%  
Loans Individually Evaluated for Impairment | Land - acquisition & development      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 0 $ 0  
Gross loans subject to general/specific reserve $ 2,198 [1] $ 3,833 [2]  
Ratio 0.00% 0.00%  
Loans Individually Evaluated for Impairment | Land - consumer lot loans      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 0 $ 0  
Gross loans subject to general/specific reserve $ 10,824 [1] $ 12,939 [2]  
Ratio 0.00% 0.00%  
Loans Individually Evaluated for Impairment | Multi-family      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 0 $ 0  
Gross loans subject to general/specific reserve $ 5,348 [1] $ 6,124 [2]  
Ratio 0.00% 0.00%  
Loans Individually Evaluated for Impairment | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 0 $ 0  
Gross loans subject to general/specific reserve $ 8,826 [1] $ 27,802 [2]  
Ratio 0.00% 0.00%  
Loans Individually Evaluated for Impairment | Commercial & industrial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 0 $ 0  
Gross loans subject to general/specific reserve $ 0 [1] $ 0 [2]  
Ratio 0.00% 0.00%  
Loans Individually Evaluated for Impairment | HELOC      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 0 $ 0  
Gross loans subject to general/specific reserve $ 1,072 [1] $ 1,650 [2]  
Ratio 0.00% 0.00%  
Loans Individually Evaluated for Impairment | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
General/specific reserve allocation $ 0 $ 0  
Gross loans subject to general/specific reserve $ 86 [1] $ 0 [2]  
Ratio 0.00% 0.00%  
[1] Excludes acquired loans with discounts sufficient to absorb potential losses and covered loans
[2] Excludes acquired loans with discounts sufficient to absorb potential losses and covered loans