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Covered Assets (Details) (USD $) | 12 Months Ended
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Sep. 30, 2011 | Sep. 30, 2010
Covered assets | $ 438,566,000 | $ 578,629,000
Gross covered loans | 495,358,000 | 685,384,000
Covered loans, allowance for losses | (3,766,000) | 0
Outstanding principal balance of acquired loans | 491,592,000 | 685,384,000
Discount balance related to acquired loans | 109,409,000 | 150,910,000
Covered loans, net | 382,183,000 | 534,474,000
FDIC Indemnification Asset Movement Analysis [Roll Forward] |  |
Balance at beginning of period | 131,128,000 | 0
Additions | 7,707,000 | 227,500,000
Payments received | (32,828,000) | (92,551,000)
Amortization | (10,239,000) | (8,150,000)
Accretion | 3,103,000 | 4,329,000
Balance at end of period | 98,871,000 | 131,128,000
Single Family Residential [Member] |  |
Gross covered loans | 55,449,000 | 66,735,000
Single Family Residential [Member] | Acquired Impaired Assets [Member] |  |
Gross covered loans | 9,235,000 | 7,872,000
Single Family Residential [Member] | Acquired Non Impaired Assets [Member] |  |
Gross covered loans | 46,214,000 | 58,863,000
Construction, Speculative [Member] |  |
Gross covered loans | 9,321,000 | 29,630,000
Construction, Speculative [Member] | Acquired Impaired Assets [Member] |  |
Gross covered loans | 8,006,000 | 24,353,000
Construction, Speculative [Member] | Acquired Non Impaired Assets [Member] |  |
Gross covered loans | 1,315,000 | 5,277,000
Construction, Custom [Member] |  |
Gross covered loans | 2,799,000 | 6,927,000
Construction, Custom [Member] | Acquired Impaired Assets [Member] |  |
Gross covered loans | 2,799,000 | 6,533,000
Construction, Custom [Member] | Acquired Non Impaired Assets [Member] |  |
Gross covered loans | 0 | 394,000
Land, Acquisition and Development [Member] |  |
Gross covered loans | 47,217,000 | 102,982,000
Land, Acquisition and Development [Member] | Acquired Impaired Assets [Member] |  |
Gross covered loans | 32,159,000 | 78,308,000
Land, Acquisition and Development [Member] | Acquired Non Impaired Assets [Member] |  |
Gross covered loans | 15,058,000 | 24,674,000
Land, Consumer Lot Loans [Member] |  |
Gross covered loans | 1,153,000 | 1,813,000
Land, Consumer Lot Loans [Member] | Acquired Impaired Assets [Member] |  |
Gross covered loans | 499,000 | 499,000
Land, Consumer Lot Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Gross covered loans | 654,000 | 1,314,000
Multi Family Housing [Member] |  |
Gross covered loans | 44,239,000 | 54,258,000
Multi Family Housing [Member] | Acquired Impaired Assets [Member] |  |
Gross covered loans | 9,333,000 | 12,342,000
Multi Family Housing [Member] | Acquired Non Impaired Assets [Member] |  |
Gross covered loans | 34,906,000 | 41,916,000
Commercial Real Estate [Member] |  |
Gross covered loans | 250,063,000 | 308,987,000
Commercial Real Estate [Member] | Acquired Impaired Assets [Member] |  |
Gross covered loans | 101,599,000 | 127,844,000
Commercial Real Estate [Member] | Acquired Non Impaired Assets [Member] |  |
Gross covered loans | 148,464,000 | 181,143,000
Commercial and Industrial Loans [Member] |  |
Gross covered loans | 58,874,000 | 83,554,000
Commercial and Industrial Loans [Member] | Acquired Impaired Assets [Member] |  |
Gross covered loans | 35,993,000 | 45,214,000
Commercial and Industrial Loans [Member] | Acquired Non Impaired Assets [Member] |  |
Gross covered loans | 22,881,000 | 38,340,000
Home Equity Line of Credit [Member] |  |
Gross covered loans | 23,559,000 | 26,587,000
Home Equity Line of Credit [Member] | Acquired Impaired Assets [Member] |  |
Gross covered loans | 1,829,000 | 1,911,000
Home Equity Line of Credit [Member] | Acquired Non Impaired Assets [Member] |  |
Gross covered loans | 21,730,000 | 24,676,000
Consumer Portfolio Segment [Member] |  |
Gross covered loans | 2,684,000 | 3,911,000
Consumer Portfolio Segment [Member] | Acquired Impaired Assets [Member] |  |
Gross covered loans | 1,485,000 | 1,956,000
Consumer Portfolio Segment [Member] | Acquired Non Impaired Assets [Member] |  |
Gross covered loans | 1,199,000 | 1,955,000
Acquired Impaired Assets [Member] |  |
Gross covered loans | 202,937,000 | 306,832,000
Covered loans, allowance for losses | (3,766,000) | 0
Outstanding principal balance of acquired loans | 199,171,000 | 306,832,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] |  |
Accretable Yield, Beginning of Period | 27,019,000 | 0
Carrying Amount, Beginning of period | 190,530,000 | 0
Accretable Yield, Additions | 0 | 36,731,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Additons | 0 | 246,383,000
Accretable Yield, Reclassifications from nonaccretable difference | 24,025,000 | 0
Accretable Yield, Accretion | (13,972,000) | (9,712,000)
Transfers to Real Estate Owned | (54,638,000) | (34,536,000)
Payments received, net | (33,803,000) | (31,029,000)
Carrying Amount, End of period | 116,061,000 | 190,530,000
Accretable Yield, End of Period | 37,072,000 | 27,019,000
FDIC Indemnification Asset Movement Analysis [Roll Forward] |  |
Accretion | 13,972,000 | 9,712,000
Acquired Non Impaired Assets [Member] |  |
Gross covered loans | 292,421,000 | 378,552,000
Covered loans, allowance for losses | 0 | 0
Outstanding principal balance of acquired loans | 292,421,000 | 378,552,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] |  |
Accretable Yield, Beginning of Period | 39,813,000 | 0
Carrying Amount, Beginning of period | 343,944,000 | 0
Accretable Yield, Additions | 0 | 50,000,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Additons | 0 | 425,000,000
Accretable Yield, Reclassifications from nonaccretable difference | 0 | 0
Accretable Yield, Accretion | (9,443,000) | (10,187,000)
Transfers to Real Estate Owned | 0 | 0
Payments received, net | (83,499,000) | (91,243,000)
Carrying Amount, End of period | 269,888,000 | 343,944,000
Accretable Yield, End of Period | 30,370,000 | 39,813,000
FDIC Indemnification Asset Movement Analysis [Roll Forward] |  |
Accretion | $ 9,443,000 | $ 10,187,000

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- Definition The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 03-3 -Paragraph 16 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6891207&loc=d3e13503-111538 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition The current period recognition due to accretion of the excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 03-3 -Paragraph 16 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6891207&loc=d3e13503-111538 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition The increases in the aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable, due to the acquisition of similar loans not accounted for as debt securities during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 03-3 -Paragraph 16 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6891207&loc=d3e13503-111538 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition The change in the estimate of cash flows expected to be collected, after acquisition of loans, which results in an increase in accretable yield (for example, if actual cash flows are significantly greater than previously expected). This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 03-3 -Paragraph 16 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6891207&loc=d3e13503-111538 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 03-3 -Paragraph 16 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6891207&loc=d3e13503-111538 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Disclosure of the unamortized amount of the discount on the note or receivable which is deducted from the face amount of the receivable or loan. The discount or premium is the difference between the present value and the face amount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 + Details
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- Definition Covered assets include loans and real estate held for sale participating in loss share with the FDIC. + Details
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