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Allowance for Losses on Loans (Impaired Loans Based on Loan Types) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Sep. 30, 2012
Financing Receivable, Impaired [Line Items]      
Recorded Investment $ 506,631 $ 506,631 $ 565,553
Unpaid Principal Balance 544,884 544,884 617,765
Related Allowance 27,237 [1] 27,237 [1] 41,628 [2]
Average Recorded Investment 488,029 483,809 471,396
Amount of related allowance included in specific reserves 8,845 8,845 15,983
Amount of related allowance included in general reserves 18,392 18,392 25,645
Single-Family Residential [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 398,770 398,770 424,856
Unpaid Principal Balance 413,523 413,523 442,243
Related Allowance 18,392 18,392 25,723
Average Recorded Investment 384,003 380,468 354,874
Construction - Speculative [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 21,280 21,280 26,562
Unpaid Principal Balance 22,965 22,965 29,404
Related Allowance 2,008 2,008 2,981
Average Recorded Investment 21,460 21,749 26,403
Construction - Custom [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 120 120 0
Unpaid Principal Balance 120 120 0
Related Allowance 0 0 0
Average Recorded Investment 60 40 0
Land - Acquisition & Development [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 27,789 27,789 38,750
Unpaid Principal Balance 41,819 41,819 50,959
Related Allowance 4,890 4,890 8,901
Average Recorded Investment 28,883 30,294 38,067
Land - Consumer Lot Loans [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 16,306 16,306 15,558
Unpaid Principal Balance 16,698 16,698 16,066
Related Allowance 311 311 761
Average Recorded Investment 15,715 15,524 13,613
Multi-Family [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 16,551 16,551 22,945
Unpaid Principal Balance 17,267 17,267 23,546
Related Allowance 1,380 1,380 2,462
Average Recorded Investment 15,297 14,938 21,214
Commercial Real Estate [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 23,071 23,071 34,912
Unpaid Principal Balance 24,411 24,411 46,378
Related Allowance 256 256 798
Average Recorded Investment 20,443 18,738 15,843
Commercial & Industrial [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 1,629 1,629 1,146
Unpaid Principal Balance 6,938 6,938 7,365
Related Allowance 0 0 2
Average Recorded Investment 1,153 1,077 603
HELOC [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 1,097 1,097 824
Unpaid Principal Balance 1,112 1,112 1,800
Related Allowance 0 0 0
Average Recorded Investment 1,006 972 779
Consumer [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 18 18 0
Unpaid Principal Balance 31 31 4
Related Allowance 0 0 0
Average Recorded Investment 9 9 0
Financing Receivable, Impairment, No Related Allowance [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 81,566 81,566 181,576
Unpaid Principal Balance 107,904 107,904 233,384
Related Allowance 0 0 0
Average Recorded Investment 68,106 63,979 100,507
Financing Receivable, Impairment, No Related Allowance [Member] | Single-Family Residential [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 41,125 41,125 106,955
Unpaid Principal Balance 48,331 48,331 124,342
Related Allowance 0 0 0
Average Recorded Investment 34,045 32,492 49,524
Financing Receivable, Impairment, No Related Allowance [Member] | Construction - Speculative [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 4,377 4,377 13,726
Unpaid Principal Balance 5,217 5,217 16,568
Related Allowance 0 0 0
Average Recorded Investment 4,135 4,066 13,581
Financing Receivable, Impairment, No Related Allowance [Member] | Construction - Custom [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 120 120 0
Unpaid Principal Balance 120 120 0
Related Allowance 0 0 0
Average Recorded Investment 60 40 0
Financing Receivable, Impairment, No Related Allowance [Member] | Land - Acquisition & Development [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 10,026 10,026 18,000
Unpaid Principal Balance 21,395 21,395 30,209
Related Allowance 0 0 0
Average Recorded Investment 9,855 10,099 16,417
Financing Receivable, Impairment, No Related Allowance [Member] | Land - Consumer Lot Loans [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 3,000 3,000 1,677
Unpaid Principal Balance 3,246 3,246 2,185
Related Allowance 0 0 0
Average Recorded Investment 2,498 2,325 487
Financing Receivable, Impairment, No Related Allowance [Member] | Multi-Family [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 5,498 5,498 8,792
Unpaid Principal Balance 5,498 5,498 8,991
Related Allowance 0 0 0
Average Recorded Investment 3,218 2,460 6,935
Financing Receivable, Impairment, No Related Allowance [Member] | Commercial Real Estate [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 15,616 15,616 31,190
Unpaid Principal Balance 16,956 16,956 42,656
Related Allowance 0 0 0
Average Recorded Investment 12,968 11,244 12,946
Financing Receivable, Impairment, No Related Allowance [Member] | Commercial & Industrial [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 1,629 1,629 1,146
Unpaid Principal Balance 6,938 6,938 7,363
Related Allowance 0 0 0
Average Recorded Investment 1,153 1,077 581
Financing Receivable, Impairment, No Related Allowance [Member] | HELOC [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 157 157 90
Unpaid Principal Balance 172 172 1,066
Related Allowance 0 0 0
Average Recorded Investment 165 167 36
Financing Receivable, Impairment, No Related Allowance [Member] | Consumer [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 18 18 0
Unpaid Principal Balance 31 31 4
Related Allowance 0 0 0
Average Recorded Investment 9 9 0
Financing Receivable, Impairment, Allowance Recorded [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 425,065 425,065 383,977
Unpaid Principal Balance 436,980 436,980 384,381
Related Allowance 27,237 [1] 27,237 [1] 41,628 [2]
Average Recorded Investment 419,923 419,830 370,889
Financing Receivable, Impairment, Allowance Recorded [Member] | Single-Family Residential [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 357,645 357,645 317,901
Unpaid Principal Balance 365,192 365,192 317,901
Related Allowance 18,392 18,392 25,723
Average Recorded Investment 349,958 347,976 305,350
Financing Receivable, Impairment, Allowance Recorded [Member] | Construction - Speculative [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 16,903 16,903 12,836
Unpaid Principal Balance 17,748 17,748 12,836
Related Allowance 2,008 2,008 2,981
Average Recorded Investment 17,325 17,683 12,822
Financing Receivable, Impairment, Allowance Recorded [Member] | Construction - Custom [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 0 0 0
Unpaid Principal Balance 0 0 0
Related Allowance 0 0 0
Average Recorded Investment 0 0 0
Financing Receivable, Impairment, Allowance Recorded [Member] | Land - Acquisition & Development [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 17,763 17,763 20,750
Unpaid Principal Balance 20,424 20,424 20,750
Related Allowance 4,890 4,890 8,901
Average Recorded Investment 19,028 20,195 21,650
Financing Receivable, Impairment, Allowance Recorded [Member] | Land - Consumer Lot Loans [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 13,306 13,306 13,881
Unpaid Principal Balance 13,452 13,452 13,881
Related Allowance 311 311 761
Average Recorded Investment 13,217 13,199 13,126
Financing Receivable, Impairment, Allowance Recorded [Member] | Multi-Family [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 11,053 11,053 14,153
Unpaid Principal Balance 11,769 11,769 14,555
Related Allowance 1,380 1,380 2,462
Average Recorded Investment 12,079 12,478 14,279
Financing Receivable, Impairment, Allowance Recorded [Member] | Commercial Real Estate [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 7,455 7,455 3,722
Unpaid Principal Balance 7,455 7,455 3,722
Related Allowance 256 256 798
Average Recorded Investment 7,475 7,494 2,897
Financing Receivable, Impairment, Allowance Recorded [Member] | Commercial & Industrial [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 0 0 0
Unpaid Principal Balance 0 0 2
Related Allowance 0 0 2
Average Recorded Investment 0 0 22
Financing Receivable, Impairment, Allowance Recorded [Member] | HELOC [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 940 940 734
Unpaid Principal Balance 940 940 734
Related Allowance 0 0 0
Average Recorded Investment 841 805 743
Financing Receivable, Impairment, Allowance Recorded [Member] | Consumer [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 0 0 0
Unpaid Principal Balance 0 0 0
Related Allowance 0 0 0
Average Recorded Investment $ 0 $ 0 $ 0
[1] Includes $8,845,000 of specific reserves and $18,392,000 included in the general reserves.
[2] Includes $15,983,000 of specific reserves and $25,645,000 included in the general reserves.