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Allowance for Losses on Loans (Impaired Loans Based on Loan Types) (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2012 | Sep. 30, 2011 | Jun. 30, 2012
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | $ 550,431,000 |  | $ 476,822,000 |  | $ 550,431,000 |
Unpaid Principal Balance | 619,614,000 |  | 514,726,000 |  | 619,614,000 |
Related Allowance | 46,676,000 | [1] | 65,424,000 | [2] | 46,676,000 | [1]
Average Recorded Investment | 511,393,000 |  | 392,675,000 |  | 474,891,000 |
Amount of related allowance included in specific reserves | 21,787,000 |  | 41,912,000 |  | 21,787,000 |
Amount of related allowance included in general reserves | 24,889,000 |  | 23,512,000 |  | 24,889,000 |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 421,608,000 |  | 337,143,000 |  | 421,608,000 |
Unpaid Principal Balance | 439,595,000 |  | 341,121,000 |  | 439,595,000 |
Related Allowance | 25,796,000 |  | 29,378,000 |  | 25,796,000 |
Average Recorded Investment | 394,326,000 |  | 267,671,000 |  | 366,923,000 |
Construction, Speculative [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 28,643,000 |  | 37,541,000 |  | 28,643,000 |
Unpaid Principal Balance | 31,421,000 |  | 40,281,000 |  | 31,421,000 |
Related Allowance | 4,238,000 |  | 6,859,000 |  | 4,238,000 |
Average Recorded Investment | 30,063,000 |  | 33,759,000 |  | 28,216,000 |
Construction, Custom [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 0 |
Unpaid Principal Balance | 157,000 |  | 0 |  | 157,000 |
Related Allowance | 0 |  | 0 |  | 0 |
Average Recorded Investment | 0 |  | 0 |  | 0 |
Land, Acquisition and Development [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 43,198,000 |  | 71,472,000 |  | 43,198,000 |
Unpaid Principal Balance | 62,433,000 |  | 100,882,000 |  | 62,433,000 |
Related Allowance | 11,617,000 |  | 22,230,000 |  | 11,617,000 |
Average Recorded Investment | 43,654,000 |  | 69,174,000 |  | 45,991,000 |
Land, Consumer Lot Loans [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 2,416,000 |  | 352,000 |  | 2,416,000 |
Unpaid Principal Balance | 2,622,000 |  | 352,000 |  | 2,622,000 |
Related Allowance | 890,000 |  | 1,135,000 |  | 890,000 |
Average Recorded Investment | 1,249,000 |  | 110,000 |  | 625,000 |
Multi Family Housing [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 19,588,000 |  | 20,382,000 |  | 19,588,000 |
Unpaid Principal Balance | 19,796,000 |  | 21,657,000 |  | 19,796,000 |
Related Allowance | 2,110,000 |  | 4,180,000 |  | 2,110,000 |
Average Recorded Investment | 19,221,000 |  | 16,438,000 |  | 18,005,000 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 33,307,000 |  | 9,891,000 |  | 33,307,000 |
Unpaid Principal Balance | 47,234,000 |  | 10,392,000 |  | 47,234,000 |
Related Allowance | 2,012,000 |  | 1,601,000 |  | 2,012,000 |
Average Recorded Investment | 21,894,000 |  | 5,492,000 |  | 14,618,000 |
Commercial and Industrial Loans [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 1,581,000 |  | 41,000 |  | 1,581,000 |
Unpaid Principal Balance | 13,278,000 |  | 41,000 |  | 13,278,000 |
Related Allowance | 13,000 |  | 41,000 |  | 13,000 |
Average Recorded Investment | 903,000 |  | 31,000 |  | 471,000 |
Home Equity Line of Credit [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 90,000 |  | 0 |  | 90,000 |
Unpaid Principal Balance | 3,018,000 |  | 0 |  | 3,018,000 |
Related Allowance | 0 |  | 0 |  | 0 |
Average Recorded Investment | 83,000 |  | 0 |  | 42,000 |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 0 |
Unpaid Principal Balance | 60,000 |  | 0 |  | 60,000 |
Related Allowance | 0 |  | 0 |  | 0 |
Average Recorded Investment | 0 |  | 0 |  | 0 |
Financing Receivable, Impairment, Allowance Recorded [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 406,906,000 |  | 433,808,000 |  | 406,906,000 |
Unpaid Principal Balance | 406,905,000 |  | 434,684,000 |  | 406,905,000 |
Related Allowance | 46,676,000 | [1] | 65,424,000 | [2] | 46,676,000 | [1]
Average Recorded Investment | 395,154,000 |  | 344,999,000 |  | 394,762,000 |
Financing Receivable, Impairment, Allowance Recorded [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 345,103,000 |  | 331,546,000 |  | 345,103,000 |
Unpaid Principal Balance | 345,103,000 |  | 331,546,000 |  | 345,103,000 |
Related Allowance | 25,796,000 |  | 29,378,000 |  | 25,796,000 |
Average Recorded Investment | 334,249,000 |  | 261,736,000 |  | 333,820,000 |
Financing Receivable, Impairment, Allowance Recorded [Member] | Construction, Speculative [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 14,602,000 |  | 29,255,000 |  | 14,602,000 |
Unpaid Principal Balance | 14,602,000 |  | 29,255,000 |  | 14,602,000 |
Related Allowance | 4,238,000 |  | 6,859,000 |  | 4,238,000 |
Average Recorded Investment | 14,600,000 |  | 26,385,000 |  | 14,519,000 |
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 | 26,985,000 |  | 49,036,000 |  | 26,985,000 |
Unpaid Principal Balance | 26,984,000 |  | 49,912,000 |  | 26,984,000 |
Related Allowance | 11,617,000 |  | 22,230,000 |  | 11,617,000 |
Average Recorded Investment | 27,232,000 |  | 41,006,000 |  | 27,966,000 |
Financing Receivable, Impairment, Allowance Recorded [Member] | Land, Consumer Lot Loans [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 1,622,000 |  | 352,000 |  | 1,622,000 |
Unpaid Principal Balance | 1,622,000 |  | 352,000 |  | 1,622,000 |
Related Allowance | 890,000 |  | 1,135,000 |  | 890,000 |
Average Recorded Investment | 811,000 |  | 110,000 |  | 406,000 |
Financing Receivable, Impairment, Allowance Recorded [Member] | Multi Family Housing [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 11,312,000 |  | 17,149,000 |  | 11,312,000 |
Unpaid Principal Balance | 11,312,000 |  | 17,149,000 |  | 11,312,000 |
Related Allowance | 2,110,000 |  | 4,180,000 |  | 2,110,000 |
Average Recorded Investment | 11,332,000 |  | 12,380,000 |  | 11,367,000 |
Financing Receivable, Impairment, Allowance Recorded [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 7,269,000 |  | 6,429,000 |  | 7,269,000 |
Unpaid Principal Balance | 7,269,000 |  | 6,429,000 |  | 7,269,000 |
Related Allowance | 2,012,000 |  | 1,601,000 |  | 2,012,000 |
Average Recorded Investment | 6,912,000 |  | 3,351,000 |  | 6,656,000 |
Financing Receivable, Impairment, Allowance Recorded [Member] | Commercial and Industrial Loans [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 13,000 |  | 41,000 |  | 13,000 |
Unpaid Principal Balance | 13,000 |  | 41,000 |  | 13,000 |
Related Allowance | 13,000 |  | 41,000 |  | 13,000 |
Average Recorded Investment | 18,000 |  | 31,000 |  | 28,000 |
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 | 143,525,000 |  | 43,014,000 |  | 143,525,000 |
Unpaid Principal Balance | 212,709,000 |  | 80,042,000 |  | 212,709,000 |
Related Allowance | 0 |  | 0 |  | 0 |
Average Recorded Investment | 116,239,000 |  | 47,676,000 |  | 80,129,000 |
Financing Receivable, Impairment, No Related Allowance [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 76,505,000 |  | 5,597,000 |  | 76,505,000 |
Unpaid Principal Balance | 94,492,000 |  | 9,575,000 |  | 94,492,000 |
Related Allowance | 0 |  | 0 |  | 0 |
Average Recorded Investment | 60,077,000 |  | 5,935,000 |  | 33,103,000 |
Financing Receivable, Impairment, No Related Allowance [Member] | Construction, Speculative [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 14,041,000 |  | 8,286,000 |  | 14,041,000 |
Unpaid Principal Balance | 16,819,000 |  | 11,026,000 |  | 16,819,000 |
Related Allowance | 0 |  | 0 |  | 0 |
Average Recorded Investment | 15,463,000 |  | 7,374,000 |  | 13,697,000 |
Financing Receivable, Impairment, No Related Allowance [Member] | Construction, Custom [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 0 |
Unpaid Principal Balance | 157,000 |  | 0 |  | 157,000 |
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 | 16,213,000 |  | 22,436,000 |  | 16,213,000 |
Unpaid Principal Balance | 35,449,000 |  | 50,970,000 |  | 35,449,000 |
Related Allowance | 0 |  | 0 |  | 0 |
Average Recorded Investment | 16,422,000 |  | 28,168,000 |  | 18,025,000 |
Financing Receivable, Impairment, No Related Allowance [Member] | Land, Consumer Lot Loans [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 794,000 |  | 0 |  | 794,000 |
Unpaid Principal Balance | 1,000,000 |  | 0 |  | 1,000,000 |
Related Allowance | 0 |  | 0 |  | 0 |
Average Recorded Investment | 438,000 |  | 0 |  | 219,000 |
Financing Receivable, Impairment, No Related Allowance [Member] | Multi Family Housing [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 8,276,000 |  | 3,233,000 |  | 8,276,000 |
Unpaid Principal Balance | 8,484,000 |  | 4,508,000 |  | 8,484,000 |
Related Allowance | 0 |  | 0 |  | 0 |
Average Recorded Investment | 7,889,000 |  | 4,058,000 |  | 6,638,000 |
Financing Receivable, Impairment, No Related Allowance [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 26,038,000 |  | 3,462,000 |  | 26,038,000 |
Unpaid Principal Balance | 39,965,000 |  | 3,963,000 |  | 39,965,000 |
Related Allowance | 0 |  | 0 |  | 0 |
Average Recorded Investment | 14,982,000 |  | 2,141,000 |  | 7,962,000 |
Financing Receivable, Impairment, No Related Allowance [Member] | Commercial and Industrial Loans [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 1,568,000 |  | 0 |  | 1,568,000 |
Unpaid Principal Balance | 13,265,000 |  | 0 |  | 13,265,000 |
Related Allowance | 0 |  | 0 |  | 0 |
Average Recorded Investment | 885,000 |  | 0 |  | 443,000 |
Financing Receivable, Impairment, No Related Allowance [Member] | Home Equity Line of Credit [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 90,000 |  | 0 |  | 90,000 |
Unpaid Principal Balance | 3,018,000 |  | 0 |  | 3,018,000 |
Related Allowance | 0 |  | 0 |  | 0 |
Average Recorded Investment | 83,000 |  | 0 |  | 42,000 |
Financing Receivable, Impairment, No Related Allowance [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
Recorded Investment | 0 |  | 0 |  | 0 |
Unpaid Principal Balance | 60,000 |  | 0 |  | 60,000 |
Related Allowance | 0 |  | 0 |  | 0 |
Average Recorded Investment | $ 0 |  | $ 0 |  | $ 0 |
[1] | Includes $21,787,000 of specific reserves and $24,889,000 included in the general reserves.
[2] | Includes $41,912,000 of specific reserves and $23,512,000 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 -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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