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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.

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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