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Allowance for Losses on Loans (Impaired Loans Based on Loan Types) (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2011
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | $ 481,267,000 |  |  | $ 476,822,000 |
Unpaid Principal Balance | 512,523,000 |  |  | 514,726,000 |
Related Allowance | 65,963,000 | [1] |  | 65,424,000 | [2]
Average Recorded Investment | 467,034,000 |  | 462,951,000 |  |
Amount of related allowance included in specific reserves | 39,988,000 |  |  | 41,912,000 |
Amount of related allowance included in general reserves | 25,975,000 |  |  | 23,512,000 |
Residential Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 353,229,000 |  |  | 337,143,000 |
Unpaid Principal Balance | 353,343,000 |  |  | 341,121,000 |
Related Allowance | 30,185,000 |  |  | 29,378,000 |
Average Recorded Investment | 339,644,000 |  | 218,831,000 |  |
Construction, Speculative [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 31,734,000 |  |  | 37,541,000 |
Unpaid Principal Balance | 32,148,000 |  |  | 40,281,000 |
Related Allowance | 6,743,000 |  |  | 6,859,000 |
Average Recorded Investment | 31,536,000 |  | 76,413,000 |  |
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 | 69,709,000 |  |  | 71,472,000 |
Unpaid Principal Balance | 99,252,000 |  |  | 100,882,000 |
Related Allowance | 21,966,000 |  |  | 22,230,000 |
Average Recorded Investment | 69,357,000 |  | 137,848,000 |  |
Land, Consumer Lot Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 351,000 |  |  | 352,000 |
Unpaid Principal Balance | 351,000 |  |  | 352,000 |
Related Allowance | 1,254,000 |  |  | 1,135,000 |
Average Recorded Investment | 351,000 |  | 0 |  |
Multi Family Housing [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 18,238,000 |  |  | 20,382,000 |
Unpaid Principal Balance | 18,913,000 |  |  | 21,657,000 |
Related Allowance | 4,180,000 |  |  | 4,180,000 |
Average Recorded Investment | 18,589,000 |  | 16,975,000 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 7,959,000 |  |  | 9,891,000 |
Unpaid Principal Balance | 8,460,000 |  |  | 10,392,000 |
Related Allowance | 1,601,000 |  |  | 1,601,000 |
Average Recorded Investment | 7,514,000 |  | 10,853,000 |  |
Commercial and Industrial Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 47,000 |  |  | 41,000 |
Unpaid Principal Balance | 56,000 |  |  | 41,000 |
Related Allowance | 34,000 |  |  | 41,000 |
Average Recorded Investment | 43,000 |  | 2,031,000 |  |
Home Equity Line of Credit [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 0 |  |  | 0 |
Unpaid Principal Balance | 0 |  |  | 0 |
Related Allowance | 0 |  |  | 0 |
Average Recorded Investment | 0 |  | 0 |  |
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, Allowance Recorded [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 451,003,000 |  |  | 433,808,000 |
Unpaid Principal Balance | 451,880,000 |  |  | 434,684,000 |
Related Allowance | 65,963,000 | [1] |  | 65,424,000 | [2]
Average Recorded Investment | 437,444,000 |  | 383,562,000 |  |
Financing Receivable, Impairment, Allowance Recorded [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 352,599,000 |  |  | 331,546,000 |
Unpaid Principal Balance | 352,599,000 |  |  | 331,546,000 |
Related Allowance | 30,185,000 |  |  | 29,378,000 |
Average Recorded Investment | 338,996,000 |  | 218,831,000 |  |
Financing Receivable, Impairment, Allowance Recorded [Member] | Construction, Speculative [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 30,687,000 |  |  | 29,255,000 |
Unpaid Principal Balance | 30,687,000 |  |  | 29,255,000 |
Related Allowance | 6,743,000 |  |  | 6,859,000 |
Average Recorded Investment | 30,578,000 |  | 50,691,000 |  |
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 | 47,663,000 |  |  | 49,036,000 |
Unpaid Principal Balance | 48,540,000 |  |  | 49,912,000 |
Related Allowance | 21,966,000 |  |  | 22,230,000 |
Average Recorded Investment | 47,789,000 |  | 100,163,000 |  |
Financing Receivable, Impairment, Allowance Recorded [Member] | Land, Consumer Lot Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 351,000 |  |  | 352,000 |
Unpaid Principal Balance | 351,000 |  |  | 352,000 |
Related Allowance | 1,254,000 |  |  | 1,135,000 |
Average Recorded Investment | 351,000 |  | 0 |  |
Financing Receivable, Impairment, Allowance Recorded [Member] | Multi Family Housing [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 13,260,000 |  |  | 17,149,000 |
Unpaid Principal Balance | 13,260,000 |  |  | 17,149,000 |
Related Allowance | 4,180,000 |  |  | 4,180,000 |
Average Recorded Investment | 13,274,000 |  | 11,348,000 |  |
Financing Receivable, Impairment, Allowance Recorded [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 6,409,000 |  |  | 6,429,000 |
Unpaid Principal Balance | 6,409,000 |  |  | 6,429,000 |
Related Allowance | 1,601,000 |  |  | 1,601,000 |
Average Recorded Investment | 6,419,000 |  | 2,409,000 |  |
Financing Receivable, Impairment, Allowance Recorded [Member] | Commercial and Industrial Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 34,000 |  |  | 41,000 |
Unpaid Principal Balance | 34,000 |  |  | 41,000 |
Related Allowance | 34,000 |  |  | 41,000 |
Average Recorded Investment | 37,000 |  | 120,000 |  |
Financing Receivable, Impairment, Allowance Recorded [Member] | Home Equity Line of Credit [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] | 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 | 30,264,000 |  |  | 43,014,000 |
Unpaid Principal Balance | 60,643,000 |  |  | 80,042,000 |
Related Allowance | 0 |  |  | 0 |
Average Recorded Investment | 29,590,000 |  | 79,389,000 |  |
Financing Receivable, Impairment, No Related Allowance [Member] | Residential Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 630,000 |  |  | 5,597,000 |
Unpaid Principal Balance | 744,000 |  |  | 9,575,000 |
Related Allowance | 0 |  |  | 0 |
Average Recorded Investment | 648,000 |  | 0 |  |
Financing Receivable, Impairment, No Related Allowance [Member] | Construction, Speculative [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 1,047,000 |  |  | 8,286,000 |
Unpaid Principal Balance | 1,461,000 |  |  | 11,026,000 |
Related Allowance | 0 |  |  | 0 |
Average Recorded Investment | 958,000 |  | 25,722,000 |  |
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 | 22,046,000 |  |  | 22,436,000 |
Unpaid Principal Balance | 50,712,000 |  |  | 50,970,000 |
Related Allowance | 0 |  |  | 0 |
Average Recorded Investment | 21,568,000 |  | 37,685,000 |  |
Financing Receivable, Impairment, No Related Allowance [Member] | Land, Consumer Lot Loans [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] | Multi Family Housing [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 4,978,000 |  |  | 3,233,000 |
Unpaid Principal Balance | 5,653,000 |  |  | 4,508,000 |
Related Allowance | 0 |  |  | 0 |
Average Recorded Investment | 5,315,000 |  | 5,627,000 |  |
Financing Receivable, Impairment, No Related Allowance [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 1,550,000 |  |  | 3,462,000 |
Unpaid Principal Balance | 2,051,000 |  |  | 3,963,000 |
Related Allowance | 0 |  |  | 0 |
Average Recorded Investment | 1,095,000 |  | 8,444,000 |  |
Financing Receivable, Impairment, No Related Allowance [Member] | Commercial and Industrial Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 13,000 |  |  | 0 |
Unpaid Principal Balance | 22,000 |  |  | 0 |
Related Allowance | 0 |  |  | 0 |
Average Recorded Investment | 6,000 |  | 1,911,000 |  |
Financing Receivable, Impairment, No Related Allowance [Member] | Home Equity Line of Credit [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] | 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 $39,988,000 of specific reserves and $25,975,000 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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