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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Liabilities, Fair Value Disclosure, Recurring | $ 0 |  |  | $ 0 |  |
Liabilities, Fair Value Disclosure, Nonrecurring | 0 |  |  | 0 |  |
Gain on sale of investments | 0 |  | 0 | 0 |  | 0
Term of Contractual Due Dates of Substantially All Mortgage-Backed Securities |  |  |  | 10 years |  |
Fair Value, Measurements, Recurring [Member] | Fair Value Total [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 2,058,144 |  |  | 2,058,144 |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 2,058,144 |  |  | 2,058,144 |  |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value Total [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets | 159,892 |  |  | 159,892 |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value Total [Member] | Impaired Loans [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets | 64,500 | [1] |  | 64,500 | [1] |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value Total [Member] | Covered Real Estate Owned [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets | 18,312 | [2] |  | 18,312 | [2] |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value Total [Member] | Real Estate Held for Sale [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets | 77,080 | [2] |  | 77,080 | [2] |
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets | 0 |  |  | 0 |  |
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Impaired Loans [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets | 0 | [1] |  | 0 | [1] |
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Covered Real Estate Owned [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets | 0 | [2] |  | 0 | [2] |
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] | Real Estate Held for Sale [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets | 0 | [2] |  | 0 | [2] |
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets | 0 |  |  | 0 |  |
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Impaired Loans [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets | 0 | [1] |  | 0 | [1] |
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Covered Real Estate Owned [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets | 0 | [2] |  | 0 | [2] |
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] | Real Estate Held for Sale [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets | 0 | [2] |  | 0 | [2] |
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets | 159,892 |  |  | 159,892 |  |
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Impaired Loans [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets | 64,500 | [1] |  | 64,500 | [1] |
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Covered Real Estate Owned [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets | 18,312 | [2] |  | 18,312 | [2] |
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Real Estate Held for Sale [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets | 77,080 | [2] |  | 77,080 | [2] |
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value Total [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 514 |  |  | 514 |  |
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 514 |  |  | 514 |  |
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Obligations of U.S. Government [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value Total [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 545,585 |  |  | 545,585 |  |
Obligations of U.S. Government [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Obligations of U.S. Government [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 545,585 |  |  | 545,585 |  |
Obligations of U.S. Government [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value Total [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 22,545 |  |  | 22,545 |  |
Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 22,545 |  |  | 22,545 |  |
Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Obligations of Foreign Governments [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value Total [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Obligations of Foreign Governments [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Obligations of Foreign Governments [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Obligations of Foreign Governments [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value Total [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 452,111 |  |  | 452,111 |  |
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 452,111 |  |  | 452,111 |  |
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Collateralized Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Mortgage-backed Securities, Agency Pass-Through Certificates [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value Total [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 1,037,389 |  |  | 1,037,389 |  |
Mortgage-backed Securities, Agency Pass-Through Certificates [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Mortgage-backed Securities, Agency Pass-Through Certificates [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 1,037,389 |  |  | 1,037,389 |  |
Mortgage-backed Securities, Agency Pass-Through Certificates [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value Total [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale securities | 0 |  |  | 0 |  |
Change During Period, Fair Value Disclosure [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loss Related to Impaired Loans and Real Estate Held for Sale, Measured on Nonrecurring Basis | 7,824 |  |  | 33,258 |  |
Change During Period, Fair Value Disclosure [Member] | Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loss Related to Impaired Loans and Real Estate Held for Sale, Measured on Nonrecurring Basis | 1,967 | [1] |  | 13,005 | [1] |
Change During Period, Fair Value Disclosure [Member] | Fair Value, Measurements, Nonrecurring [Member] | Covered Real Estate Owned [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loss Related to Impaired Loans and Real Estate Held for Sale, Measured on Nonrecurring Basis | 231 | [2] |  | 603 | [2] |
Change During Period, Fair Value Disclosure [Member] | Fair Value, Measurements, Nonrecurring [Member] | Real Estate Held for Sale [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loss Related to Impaired Loans and Real Estate Held for Sale, Measured on Nonrecurring Basis | $ 5,626 | [2] |  | $ 19,650 | [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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- 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: 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 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 The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Subparagraph h -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Article 7 + Details
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- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a nonrecurring basis by the entity. + References No definition available. + 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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