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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.

X
- 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 -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 -Subparagraph (g) + Details
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- Definition The 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 -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 -Subparagraph (g) + Details
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- Definition The average recorded investment related to impaired financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 -Subparagraph (c)(1) 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=6965416&loc=d3e5258-111524 + Details
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- Definition The recorded investment related to impaired financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953550-111524 -Subparagraph (b) + 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 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 -Subparagraph (a)(3) + Details
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- Definition The unpaid principal balance related to impaired financing receivables. + 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=6965416&loc=d3e5212-111524 + Details
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