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Allowance for Losses on Loans Impaired Loans Based on Loan Types (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | $ 565,553 |  | $ 476,822 |
Unpaid Principal Balance | 617,765 |  | 514,726 |
Related Allowance | 41,628 | [1] | 65,424 | [1]
Average Recorded Investment | 471,396 |  | 392,675 |
Amount of related allowance included in specific reserves | 15,983 |  | 41,912 |
Amount of related allowance included in general reserves | 25,645 |  | 23,512 |
Single-family Residential [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 424,856 |  | 337,143 |
Unpaid Principal Balance | 442,243 |  | 341,121 |
Related Allowance | 25,723 |  | 29,378 |
Average Recorded Investment | 354,874 |  | 267,671 |
Construction, Speculative [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 26,562 |  | 37,541 |
Unpaid Principal Balance | 29,404 |  | 40,281 |
Related Allowance | 2,981 |  | 6,859 |
Average Recorded Investment | 26,403 |  | 33,759 |
Construction, Custom [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 |  | 0 |
Unpaid Principal Balance | 0 |  | 0 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | 0 |  | 0 |
Land, Acquisition and Development [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 38,750 |  | 71,472 |
Unpaid Principal Balance | 50,959 |  | 100,882 |
Related Allowance | 8,901 |  | 22,230 |
Average Recorded Investment | 38,067 |  | 69,174 |
Land, Consumer Lot Loans [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 15,558 |  | 352 |
Unpaid Principal Balance | 16,066 |  | 352 |
Related Allowance | 761 |  | 1,135 |
Average Recorded Investment | 13,613 |  | 110 |
Multi Family Housing [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 22,945 |  | 20,382 |
Unpaid Principal Balance | 23,546 |  | 21,657 |
Related Allowance | 2,462 |  | 4,180 |
Average Recorded Investment | 21,214 |  | 16,438 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 34,912 |  | 9,891 |
Unpaid Principal Balance | 46,378 |  | 10,392 |
Related Allowance | 798 |  | 1,601 |
Average Recorded Investment | 15,843 |  | 5,492 |
Commercial and Industrial Loans [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 1,146 |  | 41 |
Unpaid Principal Balance | 7,365 |  | 41 |
Related Allowance | 2 |  | 41 |
Average Recorded Investment | 603 |  | 31 |
Home Equity Line of Credit [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 824 |  | 0 |
Unpaid Principal Balance | 1,800 |  | 0 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | 779 |  | 0 |
Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 |  | 0 |
Unpaid Principal Balance | 4 |  | 0 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | 0 |  | 0 |
Financing Receivable, Impairment, Allowance Recorded [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 383,977 |  | 433,808 |
Unpaid Principal Balance | 384,381 |  | 434,684 |
Related Allowance | 41,628 | [1] | 65,424 | [1]
Average Recorded Investment | 370,889 |  | 344,999 |
Financing Receivable, Impairment, Allowance Recorded [Member] | Single-family Residential [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 317,901 |  | 331,546 |
Unpaid Principal Balance | 317,901 |  | 331,546 |
Related Allowance | 25,723 |  | 29,378 |
Average Recorded Investment | 305,350 |  | 261,736 |
Financing Receivable, Impairment, Allowance Recorded [Member] | Construction, Speculative [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 12,836 |  | 29,255 |
Unpaid Principal Balance | 12,836 |  | 29,255 |
Related Allowance | 2,981 |  | 6,859 |
Average Recorded Investment | 12,822 |  | 26,385 |
Financing Receivable, Impairment, Allowance Recorded [Member] | Construction, Custom [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 |  | 0 |
Unpaid Principal Balance | 0 |  | 0 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | 0 |  | 0 |
Financing Receivable, Impairment, Allowance Recorded [Member] | Land, Acquisition and Development [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 20,750 |  | 49,036 |
Unpaid Principal Balance | 20,750 |  | 49,912 |
Related Allowance | 8,901 |  | 22,230 |
Average Recorded Investment | 21,650 |  | 41,006 |
Financing Receivable, Impairment, Allowance Recorded [Member] | Land, Consumer Lot Loans [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 13,881 |  | 352 |
Unpaid Principal Balance | 13,881 |  | 352 |
Related Allowance | 761 |  | 1,135 |
Average Recorded Investment | 13,126 |  | 110 |
Financing Receivable, Impairment, Allowance Recorded [Member] | Multi Family Housing [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 14,153 |  | 17,149 |
Unpaid Principal Balance | 14,555 |  | 17,149 |
Related Allowance | 2,462 |  | 4,180 |
Average Recorded Investment | 14,279 |  | 12,380 |
Financing Receivable, Impairment, Allowance Recorded [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 3,722 |  | 6,429 |
Unpaid Principal Balance | 3,722 |  | 6,429 |
Related Allowance | 798 |  | 1,601 |
Average Recorded Investment | 2,897 |  | 3,351 |
Financing Receivable, Impairment, Allowance Recorded [Member] | Commercial and Industrial Loans [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 |  | 41 |
Unpaid Principal Balance | 2 |  | 41 |
Related Allowance | 2 |  | 41 |
Average Recorded Investment | 22 |  | 31 |
Financing Receivable, Impairment, Allowance Recorded [Member] | Home Equity Line of Credit [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 734 |  | 0 |
Unpaid Principal Balance | 734 |  | 0 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | 743 |  | 0 |
Financing Receivable, Impairment, Allowance Recorded [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 |  | 0 |
Unpaid Principal Balance | 0 |  | 0 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | 0 |  | 0 |
Financing Receivable, Impairment, No Related Allowance [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 181,576 |  | 43,014 |
Unpaid Principal Balance | 233,384 |  | 80,042 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | 100,507 |  | 47,676 |
Financing Receivable, Impairment, No Related Allowance [Member] | Single-family Residential [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 106,955 |  | 5,597 |
Unpaid Principal Balance | 124,342 |  | 9,575 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | 49,524 |  | 5,935 |
Financing Receivable, Impairment, No Related Allowance [Member] | Construction, Speculative [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 13,726 |  | 8,286 |
Unpaid Principal Balance | 16,568 |  | 11,026 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | 13,581 |  | 7,374 |
Financing Receivable, Impairment, No Related Allowance [Member] | Construction, Custom [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 |  | 0 |
Unpaid Principal Balance | 0 |  | 0 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | 0 |  | 0 |
Financing Receivable, Impairment, No Related Allowance [Member] | Land, Acquisition and Development [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 18,000 |  | 22,436 |
Unpaid Principal Balance | 30,209 |  | 50,970 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | 16,417 |  | 28,168 |
Financing Receivable, Impairment, No Related Allowance [Member] | Land, Consumer Lot Loans [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 1,677 |  | 0 |
Unpaid Principal Balance | 2,185 |  | 0 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | 487 |  | 0 |
Financing Receivable, Impairment, No Related Allowance [Member] | Multi Family Housing [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 8,792 |  | 3,233 |
Unpaid Principal Balance | 8,991 |  | 4,508 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | 6,935 |  | 4,058 |
Financing Receivable, Impairment, No Related Allowance [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 31,190 |  | 3,462 |
Unpaid Principal Balance | 42,656 |  | 3,963 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | 12,946 |  | 2,141 |
Financing Receivable, Impairment, No Related Allowance [Member] | Commercial and Industrial Loans [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 1,146 |  | 0 |
Unpaid Principal Balance | 7,363 |  | 0 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | 581 |  | 0 |
Financing Receivable, Impairment, No Related Allowance [Member] | Home Equity Line of Credit [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 90 |  | 0 |
Unpaid Principal Balance | 1,066 |  | 0 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | 36 |  | 0 |
Financing Receivable, Impairment, No Related Allowance [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Recorded Investment | 0 |  | 0 |
Unpaid Principal Balance | 4 |  | 0 |
Related Allowance | 0 |  | 0 |
Average Recorded Investment | $ 0 |  | $ 0 |
[1] | 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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