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Covered Assets (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Sep. 30, 2012
Covered Assets [Line Items] |  |  |  |
Covered assets | $ 387,789 |  | $ 317,925 |
FDIC Indemnification Asset Movement Analysis [Roll Forward] |  |  |  |
Balance at beginning of period | 87,571 |  | 101,634 |
Additions | 17,373 | [1] | 3,284 | [1]
Payments made (received) | (11,668) |  | (3,456) |
Amortization | (13,451) |  | (15,510) |
Accretion, Carrying Amount of Loans | 566 |  | 1,619 |
Balance at end of period | 80,391 |  | 87,571 |
Acquired Impaired Assets [Member] |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] |  |  |  |
Balance at beginning of period, AccretableYield | 50,902 |  | 37,072 |
Balance at beginning of period, Carrying Amount of Loans | 74,953 |  | 116,061 |
Additions, AccretableYield | 43,299 | [1] |  |
Additions, Carrying Amount of Loans | 107,946 | [1] |  |
Reclassification from nonaccretable balance, net, AccretableYield |  |  | 34,690 |
Reclassification from nonaccretable balance, net, Carrying Amount of Loans |  |  | 0 |
Accretion, AccretableYield | (18,463) |  | (20,860) |
Transfers to REO, AccretableYield | 0 |  | 0 |
Transfers to REO, Carrying Amount of Loans | (7,403) |  | (15,905) |
Payments received, net, AccretableYield | 0 |  | 0 |
Payments received, net, Carrying Amount of Loans | (21,828) |  | (46,063) |
Balance at end of period, AccretableYield | 75,738 |  | 50,902 |
Balance at end of period, Carrying Amount of Loans | 172,131 |  | 74,953 |
FDIC Indemnification Asset Movement Analysis [Roll Forward] |  |  |  |
Accretion, Carrying Amount of Loans | 18,463 |  | 20,860 |
Acquired Non Impaired Assets [Member] |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] |  |  |  |
Balance at beginning of period, AccretableYield | 23,789 |  | 30,370 |
Balance at beginning of period, Carrying Amount of Loans | 213,423 |  | 269,888 |
Additions, AccretableYield | 0 | [1] |  |
Additions, Carrying Amount of Loans | 0 | [1] |  |
Reclassification from nonaccretable balance, net, AccretableYield |  |  | 0 |
Reclassification from nonaccretable balance, net, Carrying Amount of Loans |  |  | 0 |
Accretion, AccretableYield | (3,543) |  | (6,581) |
Transfers to REO, AccretableYield | 0 |  | 0 |
Transfers to REO, Carrying Amount of Loans | 0 |  | 0 |
Payments received, net, AccretableYield | 0 |  | 0 |
Payments received, net, Carrying Amount of Loans | (33,582) |  | (63,046) |
Balance at end of period, AccretableYield | 20,246 |  | 23,789 |
Balance at end of period, Carrying Amount of Loans | 183,384 |  | 213,423 |
FDIC Indemnification Asset Movement Analysis [Roll Forward] |  |  |  |
Accretion, Carrying Amount of Loans | $ 3,543 |  | $ 6,581 |
[1] | includes FDIC covered loans which were acquired as part of the South Valley acquisition.

X
- 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 FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7514592&loc=d3e13503-111538 Reference 2: 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 Reference 3: 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. + 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 FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7514592&loc=d3e13503-111538 Reference 2: 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 Reference 3: 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. + 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 FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7514592&loc=d3e13503-111538 Reference 2: 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 Reference 3: 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. + 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 FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7514592&loc=d3e13503-111538 Reference 2: 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 Reference 3: 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. + 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 FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7514592&loc=d3e13503-111538 Reference 2: 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 Reference 3: 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. + Details
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- Definition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Reclassifications from Nonaccretable Difference + References No definition available. + Details
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- Definition Covered assets include loans and real estate held for sale participating in loss share with the FDIC. + References No definition available. + Details
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