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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 | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Sep. 30, 2011
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | $ 521,739 |  | $ 565,553 |  |
Unpaid Principal Balance | 560,879 |  | 617,765 |  |
Related Allowance | 30,724 | [1] | 41,628 | [2] |
Average Recorded Investment | 522,689 |  | 471,396 |  |
Amount of related allowance included in specific reserves | 11,686 |  |  |  | 15,983
Amount of related allowance included in general reserves | 19,038 |  |  |  | 25,645
Residential Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 397,421 |  | 424,856 |  |
Unpaid Principal Balance | 413,555 |  | 442,243 |  |
Related Allowance | 19,073 |  | 25,723 |  |
Average Recorded Investment | 399,984 |  | 354,874 |  |
Construction, Speculative [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 24,170 |  | 26,562 |  |
Unpaid Principal Balance | 25,967 |  | 29,404 |  |
Related Allowance | 2,093 |  | 2,981 |  |
Average Recorded Investment | 24,656 |  | 26,403 |  |
Construction, Custom [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 568 |  | 0 |  |
Unpaid Principal Balance | 568 |  | 0 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 568 |  | 0 |  |
Land, Acquisition and Development [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 32,869 |  | 38,750 |  |
Unpaid Principal Balance | 47,007 |  | 50,959 |  |
Related Allowance | 5,959 |  | 8,901 |  |
Average Recorded Investment | 34,438 |  | 38,067 |  |
Land, Consumer Lot Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 16,879 |  | 15,558 |  |
Unpaid Principal Balance | 17,173 |  | 16,066 |  |
Related Allowance | 746 |  | 761 |  |
Average Recorded Investment | 16,785 |  | 13,613 |  |
Multi Family Housing [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 23,546 |  | 22,945 |  |
Unpaid Principal Balance | 23,661 |  | 23,546 |  |
Related Allowance | 2,245 |  | 2,462 |  |
Average Recorded Investment | 22,901 |  | 21,214 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 21,217 |  | 34,912 |  |
Unpaid Principal Balance | 22,558 |  | 46,378 |  |
Related Allowance | 608 |  | 798 |  |
Average Recorded Investment | 19,483 |  | 15,843 |  |
Commercial and Industrial Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 3,164 |  | 1,146 |  |
Unpaid Principal Balance | 8,469 |  | 7,365 |  |
Related Allowance | 0 |  | 2 |  |
Average Recorded Investment | 2,387 |  | 603 |  |
Home Equity Line of Credit [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 1,904 |  | 824 |  |
Unpaid Principal Balance | 1,904 |  | 1,800 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 1,474 |  | 779 |  |
Consumer Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 1 |  | 0 |  |
Unpaid Principal Balance | 17 |  | 4 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 13 |  | 0 |  |
Financing Receivable, Impairment, No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 84,491 |  | 181,576 |  |
Unpaid Principal Balance | 111,085 |  | 233,384 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 82,248 |  | 100,507 |  |
Financing Receivable, Impairment, No Related Allowance [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 42,110 |  | 106,955 |  |
Unpaid Principal Balance | 49,559 |  | 124,342 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 43,478 |  | 49,524 |  |
Financing Receivable, Impairment, No Related Allowance [Member] | Construction, Speculative [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 4,637 |  | 13,726 |  |
Unpaid Principal Balance | 5,529 |  | 16,568 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 4,681 |  | 13,581 |  |
Financing Receivable, Impairment, No Related Allowance [Member] | Construction, Custom [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 568 |  | 0 |  |
Unpaid Principal Balance | 568 |  | 0 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 568 |  | 0 |  |
Financing Receivable, Impairment, No Related Allowance [Member] | Land, Acquisition and Development [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 11,875 |  | 18,000 |  |
Unpaid Principal Balance | 23,244 |  | 30,209 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 12,020 |  | 16,417 |  |
Financing Receivable, Impairment, No Related Allowance [Member] | Land, Consumer Lot Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 3,094 |  | 1,677 |  |
Unpaid Principal Balance | 3,316 |  | 2,185 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 2,982 |  | 487 |  |
Financing Receivable, Impairment, No Related Allowance [Member] | Multi Family Housing [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 5,022 |  | 8,792 |  |
Unpaid Principal Balance | 5,022 |  | 8,991 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 4,281 |  | 6,935 |  |
Financing Receivable, Impairment, No Related Allowance [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 12,857 |  | 31,190 |  |
Unpaid Principal Balance | 14,198 |  | 42,656 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 11,101 |  | 12,946 |  |
Financing Receivable, Impairment, No Related Allowance [Member] | Commercial and Industrial Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 3,164 |  | 1,146 |  |
Unpaid Principal Balance | 8,469 |  | 7,363 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 2,387 |  | 581 |  |
Financing Receivable, Impairment, No Related Allowance [Member] | Home Equity Line of Credit [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 1,163 |  | 90 |  |
Unpaid Principal Balance | 1,163 |  | 1,066 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 737 |  | 36 |  |
Financing Receivable, Impairment, No Related Allowance [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 1 |  | 0 |  |
Unpaid Principal Balance | 17 |  | 4 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 13 |  | 0 |  |
Financing Receivable, Impairment, Allowance Recorded [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 437,248 |  | 383,977 |  |
Unpaid Principal Balance | 449,794 |  | 384,381 |  |
Related Allowance | 30,724 | [1] | 41,628 | [2] |
Average Recorded Investment | 440,441 |  | 370,889 |  |
Financing Receivable, Impairment, Allowance Recorded [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 355,311 |  | 317,901 |  |
Unpaid Principal Balance | 363,996 |  | 317,901 |  |
Related Allowance | 19,073 |  | 25,723 |  |
Average Recorded Investment | 356,506 |  | 305,350 |  |
Financing Receivable, Impairment, Allowance Recorded [Member] | Construction, Speculative [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 19,533 |  | 12,836 |  |
Unpaid Principal Balance | 20,438 |  | 12,836 |  |
Related Allowance | 2,093 |  | 2,981 |  |
Average Recorded Investment | 19,975 |  | 12,822 |  |
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 | 20,994 |  | 20,750 |  |
Unpaid Principal Balance | 23,763 |  | 20,750 |  |
Related Allowance | 5,959 |  | 8,901 |  |
Average Recorded Investment | 22,418 |  | 21,650 |  |
Financing Receivable, Impairment, Allowance Recorded [Member] | Land, Consumer Lot Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 13,785 |  | 13,881 |  |
Unpaid Principal Balance | 13,857 |  | 13,881 |  |
Related Allowance | 746 |  | 761 |  |
Average Recorded Investment | 13,803 |  | 13,126 |  |
Financing Receivable, Impairment, Allowance Recorded [Member] | Multi Family Housing [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 18,524 |  | 14,153 |  |
Unpaid Principal Balance | 18,639 |  | 14,555 |  |
Related Allowance | 2,245 |  | 2,462 |  |
Average Recorded Investment | 18,620 |  | 14,279 |  |
Financing Receivable, Impairment, Allowance Recorded [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 8,360 |  | 3,722 |  |
Unpaid Principal Balance | 8,360 |  | 3,722 |  |
Related Allowance | 608 |  | 798 |  |
Average Recorded Investment | 8,382 |  | 2,897 |  |
Financing Receivable, Impairment, Allowance Recorded [Member] | Commercial and Industrial Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 0 |  | 0 |  |
Unpaid Principal Balance | 0 |  | 2 |  |
Related Allowance | 0 |  | 2 |  |
Average Recorded Investment | 0 |  | 22 |  |
Financing Receivable, Impairment, Allowance Recorded [Member] | Home Equity Line of Credit [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 741 |  | 734 |  |
Unpaid Principal Balance | 741 |  | 734 |  |
Related Allowance | 0 |  | 0 |  |
Average Recorded Investment | 737 |  | 743 |  |
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 |  |
[1] | Includes $11,686,000 of specific reserves and $19,038,000 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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