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Allowance for Losses on Loans - Allowance for Losses on Loans (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance $ 116,741 $ 133,147
Charge-offs (15,099) (34,101)
Recoveries 29,463 16,345
Provisions & Transfers (18,758) 1,350
Ending allowance 112,347 116,741
Single-family residential
    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance 64,184 81,815
Charge-offs (8,529) (20,947)
Recoveries 17,684 9,416
Provisions & Transfers (10,576) (6,100)
Ending allowance 62,763 64,184
Construction - speculative
    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance 8,407 12,060
Charge-offs (949) (1,446)
Recoveries 97 501
Provisions & Transfers (813) (2,708)
Ending allowance 6,742 8,407
Construction - custom
    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance 882 347
Charge-offs 0 (481)
Recoveries 0 0
Provisions & Transfers 813 1,016
Ending allowance 1,695 882
Land - acquisition & development
    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance 9,165 15,598
Charge-offs (541) (3,983)
Recoveries 3,071 4,105
Provisions & Transfers (6,103) (6,555)
Ending allowance 5,592 9,165
Land - consumer lot loans
    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance 3,552 4,937
Charge-offs (658) (1,363)
Recoveries 22 40
Provisions & Transfers 161 (62)
Ending allowance 3,077 3,552
Multi-family
    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance 3,816 5,280
Charge-offs 0 (1,043)
Recoveries 0 171
Provisions & Transfers 432 (592)
Ending allowance 4,248 3,816
Commercial real estate
    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance 5,595 1,956
Charge-offs (105) (747)
Recoveries 33 17
Provisions & Transfers 2,025 4,369
Ending allowance 7,548 5,595
Commercial & industrial
    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance 16,614 7,626
Charge-offs (826) (1,145)
Recoveries 5,043 95
Provisions & Transfers (4,304) 10,038
Ending allowance 16,527 16,614
HELOC
    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance 1,002 965
Charge-offs (48) (163)
Recoveries 0 0
Provisions & Transfers (26) 200
Ending allowance 928 1,002
Consumer
    
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Beginning allowance 3,524 2,563
Charge-offs (3,443) (2,783)
Recoveries 3,513 2,000
Provisions & Transfers (367) 1,744
Ending allowance $ 3,227 $ 3,524