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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
Mar. 31, 2012
Sep. 30, 2011
Mar. 31, 2012
Financing Receivable, Impaired [Line Items]      
Recorded Investment $ 512,348 $ 476,822 $ 512,348
Unpaid Principal Balance 550,537 514,726 550,537
Related Allowance 52,125 [1] 65,424 [2] 52,125 [1]
Average Recorded Investment 482,730 392,675 478,569
Amount of related allowance included in specific reserves 29,781 41,912 29,781
Amount of related allowance included in general reserves 22,344 23,512 22,344
Residential Portfolio Segment [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 383,730 337,143 383,730
Unpaid Principal Balance 384,092 341,121 384,092
Related Allowance 25,823 29,378 25,823
Average Recorded Investment 357,780 267,671 354,157
Construction, Speculative [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 35,878 37,541 35,878
Unpaid Principal Balance 38,092 40,281 38,092
Related Allowance 7,751 6,859 7,751
Average Recorded Investment 32,014 33,759 31,474
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
Land, Acquisition and Development [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 58,042 71,472 58,042
Unpaid Principal Balance 91,189 100,882 91,189
Related Allowance 13,590 22,230 13,590
Average Recorded Investment 62,767 69,174 64,051
Land, Consumer Lot Loans [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 331 352 331
Unpaid Principal Balance 331 352 331
Related Allowance 1,040 1,135 1,040
Average Recorded Investment 292 110 278
Multi Family Housing [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 22,624 20,382 22,624
Unpaid Principal Balance 23,285 21,657 23,285
Related Allowance 2,110 4,180 2,110
Average Recorded Investment 20,091 16,438 19,443
Commercial Real Estate Portfolio Segment [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 11,442 9,891 11,442
Unpaid Principal Balance 13,247 10,392 13,247
Related Allowance 1,787 1,601 1,787
Average Recorded Investment 9,616 5,492 9,040
Commercial and Industrial Loans [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 225 41 225
Unpaid Principal Balance 225 41 225
Related Allowance 24 41 24
Average Recorded Investment 132 31 101
Home Equity Line of Credit [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 76 0 76
Unpaid Principal Balance 76 0 76
Related Allowance 0 0 0
Average Recorded Investment 38 0 25
Consumer Portfolio Segment [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]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 408,538 433,808 408,538
Unpaid Principal Balance 409,414 434,684 409,414
Related Allowance 52,125 [1] 65,424 [2] 52,125 [1]
Average Recorded Investment 406,915 344,999 411,308
Financing Receivable, Impairment, Allowance Recorded [Member] | Residential Portfolio Segment [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 332,053 331,546 332,053
Unpaid Principal Balance 332,053 331,546 332,053
Related Allowance 25,823 29,378 25,823
Average Recorded Investment 331,768 261,736 336,505
Financing Receivable, Impairment, Allowance Recorded [Member] | Construction, Speculative [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 27,751 29,255 27,751
Unpaid Principal Balance 27,751 29,255 27,751
Related Allowance 7,751 6,859 7,751
Average Recorded Investment 26,163 26,385 25,511
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 and Development [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 30,521 49,036 30,521
Unpaid Principal Balance 31,397 49,912 31,397
Related Allowance 13,590 22,230 13,590
Average Recorded Investment 30,921 41,006 31,138
Financing Receivable, Impairment, Allowance Recorded [Member] | Land, Consumer Lot Loans [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 250 352 250
Unpaid Principal Balance 250 352 250
Related Allowance 1,040 1,135 1,040
Average Recorded Investment 251 110 251
Financing Receivable, Impairment, Allowance Recorded [Member] | Multi Family Housing [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 11,352 17,149 11,352
Unpaid Principal Balance 11,352 17,149 11,352
Related Allowance 2,110 4,180 2,110
Average Recorded Investment 11,370 12,380 11,386
Financing Receivable, Impairment, Allowance Recorded [Member] | Commercial Real Estate Portfolio Segment [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 6,587 6,429 6,587
Unpaid Principal Balance 6,587 6,429 6,587
Related Allowance 1,787 1,601 1,787
Average Recorded Investment 6,413 3,351 6,484
Financing Receivable, Impairment, Allowance Recorded [Member] | Commercial and Industrial Loans [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 24 41 24
Unpaid Principal Balance 24 41 24
Related Allowance 24 41 24
Average Recorded Investment 29 31 33
Financing Receivable, Impairment, Allowance Recorded [Member] | Home Equity Line of Credit [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] | Consumer Portfolio Segment [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, No Related Allowance [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 103,810 43,014 103,810
Unpaid Principal Balance 141,123 80,042 141,123
Related Allowance 0 0 0
Average Recorded Investment 75,815 47,676 67,261
Financing Receivable, Impairment, No Related Allowance [Member] | Residential Portfolio Segment [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 51,677 5,597 51,677
Unpaid Principal Balance 52,039 9,575 52,039
Related Allowance 0 0 0
Average Recorded Investment 26,012 5,935 17,652
Financing Receivable, Impairment, No Related Allowance [Member] | Construction, Speculative [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 8,127 8,286 8,127
Unpaid Principal Balance 10,341 11,026 10,341
Related Allowance 0 0 0
Average Recorded Investment 5,851 7,374 5,963
Financing Receivable, Impairment, No Related Allowance [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, No Related Allowance [Member] | Land, Acquisition and Development [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 27,521 22,436 27,521
Unpaid Principal Balance 59,792 50,970 59,792
Related Allowance 0 0 0
Average Recorded Investment 31,846 28,168 32,913
Financing Receivable, Impairment, No Related Allowance [Member] | Land, Consumer Lot Loans [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 81 0 81
Unpaid Principal Balance 81 0 81
Related Allowance 0 0 0
Average Recorded Investment 41 0 27
Financing Receivable, Impairment, No Related Allowance [Member] | Multi Family Housing [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 11,272 3,233 11,272
Unpaid Principal Balance 11,933 4,508 11,933
Related Allowance 0 0 0
Average Recorded Investment 8,721 4,058 8,057
Financing Receivable, Impairment, No Related Allowance [Member] | Commercial Real Estate Portfolio Segment [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 4,855 3,462 4,855
Unpaid Principal Balance 6,660 3,963 6,660
Related Allowance 0 0 0
Average Recorded Investment 3,203 2,141 2,556
Financing Receivable, Impairment, No Related Allowance [Member] | Commercial and Industrial Loans [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 201 0 201
Unpaid Principal Balance 201 0 201
Related Allowance 0 0 0
Average Recorded Investment 103 0 68
Financing Receivable, Impairment, No Related Allowance [Member] | Home Equity Line of Credit [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 76 0 76
Unpaid Principal Balance 76 0 76
Related Allowance 0 0 0
Average Recorded Investment 38 0 25
Financing Receivable, Impairment, No Related Allowance [Member] | Consumer Portfolio Segment [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 $29,781,000 of specific reserves and $22,344,000 included in the general reserves.
[2] Includes $41,912,000 of specific reserves and $23,512,000 included in the general reserves.