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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Mar. 31, 2012 Carrying (Reported) Amount, Fair Value Disclosure [Member] | Sep. 30, 2011 Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mar. 31, 2012 Portion at Fair Value, Fair Value Disclosure [Member] | Sep. 30, 2011 Portion at Fair Value, Fair Value Disclosure [Member] | Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member] | Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] | Mar. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Change During Period, Fair Value Disclosure [Member] | Mar. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Change During Period, Fair Value Disclosure [Member] | Mar. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Change During Period, Fair Value Disclosure [Member] Impaired Loans [Member] | Mar. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Change During Period, Fair Value Disclosure [Member] Impaired Loans [Member] | Mar. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Change During Period, Fair Value Disclosure [Member] Covered Real Estate Owned [Member] | Mar. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Change During Period, Fair Value Disclosure [Member] Covered Real Estate Owned [Member] | Mar. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Change During Period, Fair Value Disclosure [Member] Real Estate Held for Sale [Member] | Mar. 31, 2012 Fair Value, Measurements, Nonrecurring [Member] Change During Period, Fair Value Disclosure [Member] Real Estate Held for Sale [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Impaired Loans [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Covered Real Estate Owned [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Real Estate Held for Sale [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member] Impaired Loans [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member] Covered Real Estate Owned [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member] Real Estate Held for Sale [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member] Impaired Loans [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member] Covered Real Estate Owned [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member] Real Estate Held for Sale [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member] Impaired Loans [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member] Covered Real Estate Owned [Member] | Dec. 31, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member] Real Estate Held for Sale [Member] | Mar. 31, 2012 Equity Securities [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] | Sep. 30, 2011 Equity Securities [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mar. 31, 2012 Equity Securities [Member] Portion at Fair Value, Fair Value Disclosure [Member] | Sep. 30, 2011 Equity Securities [Member] Portion at Fair Value, Fair Value Disclosure [Member] | Mar. 31, 2012 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member] | Mar. 31, 2012 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2012 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2012 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] | Mar. 31, 2012 US Treasury and Government [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] | Sep. 30, 2011 US Treasury and Government [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mar. 31, 2012 US Treasury and Government [Member] Portion at Fair Value, Fair Value Disclosure [Member] | Sep. 30, 2011 US Treasury and Government [Member] Portion at Fair Value, Fair Value Disclosure [Member] | Mar. 31, 2012 US Treasury and Government [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member] | Mar. 31, 2012 US Treasury and Government [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2012 US Treasury and Government [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2012 US Treasury and Government [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] | Mar. 31, 2012 US States and Political Subdivisions Debt Securities [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] | Sep. 30, 2011 US States and Political Subdivisions Debt Securities [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mar. 31, 2012 US States and Political Subdivisions Debt Securities [Member] Portion at Fair Value, Fair Value Disclosure [Member] | Sep. 30, 2011 US States and Political Subdivisions Debt Securities [Member] Portion at Fair Value, Fair Value Disclosure [Member] | Mar. 31, 2012 US States and Political Subdivisions Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member] | Mar. 31, 2012 US States and Political Subdivisions Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2012 US States and Political Subdivisions Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2012 US States and Political Subdivisions Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] | Mar. 31, 2012 Foreign Government Debt Securities [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] | Sep. 30, 2011 Foreign Government Debt Securities [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mar. 31, 2012 Foreign Government Debt Securities [Member] Portion at Fair Value, Fair Value Disclosure [Member] | Sep. 30, 2011 Foreign Government Debt Securities [Member] Portion at Fair Value, Fair Value Disclosure [Member] | Mar. 31, 2012 Foreign Government Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member] | Mar. 31, 2012 Foreign Government Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2012 Foreign Government Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2012 Foreign Government Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] | Mar. 31, 2012 Corporate Debt Securities [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] | Sep. 30, 2011 Corporate Debt Securities [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mar. 31, 2012 Corporate Debt Securities [Member] Portion at Fair Value, Fair Value Disclosure [Member] | Sep. 30, 2011 Corporate Debt Securities [Member] Portion at Fair Value, Fair Value Disclosure [Member] | Mar. 31, 2012 Corporate Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member] | Mar. 31, 2012 Corporate Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2012 Corporate Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2012 Corporate Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] | Mar. 31, 2012 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] | Sep. 30, 2011 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mar. 31, 2012 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Portion at Fair Value, Fair Value Disclosure [Member] | Sep. 30, 2011 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Portion at Fair Value, Fair Value Disclosure [Member] | Mar. 31, 2012 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member] | Mar. 31, 2012 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2012 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2012 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] | Mar. 31, 2012 Other Debt Obligations [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] | Sep. 30, 2011 Other Debt Obligations [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] | Mar. 31, 2012 Other Debt Obligations [Member] Portion at Fair Value, Fair Value Disclosure [Member] | Sep. 30, 2011 Other Debt Obligations [Member] Portion at Fair Value, Fair Value Disclosure [Member] | Mar. 31, 2012 Other Debt Obligations [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member] | Mar. 31, 2012 Other Debt Obligations [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2012 Other Debt Obligations [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2012 Other Debt Obligations [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | $ 3,687,625 | $ 3,255,144 | $ 3,687,625 | $ 3,255,144 | $ 3,687,625 | $ 0 | $ 3,687,625 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 14,142 | $ 190,527 | $ 14,142 | $ 190,527 | $ 14,142 | $ 0 | $ 14,142 | $ 0 | $ 23,500 | $ 23,568 | $ 23,500 | $ 23,568 | $ 23,500 | $ 0 | $ 23,500 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 277,586 | $ 29,959 | $ 277,586 | $ 29,959 | $ 277,586 | $ 0 | $ 277,586 | $ 0 | $ 3,372,397 | $ 3,011,090 | $ 3,372,397 | $ 3,011,090 | $ 3,372,397 | $ 0 | $ 3,372,397 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Assets, Fair Value Disclosure, Nonrecurring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 212,862 | 81,219 | [1] | 24,915 | [2] | 106,728 | [2] | 0 | 0 | [1] | 0 | [2] | 0 | [2] | 0 | 0 | [1] | 0 | [2] | 0 | [2] | 212,862 | 81,219 | [1] | 24,915 | [2] | 106,728 | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Related to Impaired Loans and Real Estate Held for Sale, Measured on Nonrecurring Basis |  |  |  |  |  |  |  |  | $ 40,711 | $ 63,377 | $ 21,831 | [1] | $ 22,832 | [1] | $ 500 | [2] | $ 1,201 | [2] | $ 18,380 | [2] | $ 39,344 | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The losses represents remeasurements of collateral-dependent loans.
[2] | The losses represents aggregate writedowns and charge-offs on real estate held for sale.

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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X
- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -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 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition Fair value adjustments to collateral dependent loans and real estate held for sale are recorded to reflect write-downs of principal balances based on the current appraised or estimated value of the collateral. + References No definition available. + Details
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