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Fair Value Measurements (Details) (USD $) | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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, 2013 | Mar. 31, 2014 | Sep. 30, 2013 | Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value Total [Member] | Sep. 30, 2013 Fair Value, Measurements, Recurring [Member] Fair Value Total [Member] | Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Sep. 30, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Sep. 30, 2013 Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Sep. 30, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value Total [Member] | Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value Total [Member] | Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value Total [Member] Impaired Loans [Member] | Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value Total [Member] Impaired Loans [Member] | Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value Total [Member] Covered Real Estate Owned [Member] | Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value Total [Member] Covered Real Estate Owned [Member] | Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value Total [Member] Real Estate Held for Sale [Member] | Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value Total [Member] Real Estate Held for Sale [Member] | Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member] Impaired Loans [Member] | Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member] Impaired Loans [Member] | Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member] Covered Real Estate Owned [Member] | Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member] Covered Real Estate Owned [Member] | Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member] Real Estate Held for Sale [Member] | Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member] Real Estate Held for Sale [Member] | Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member] | Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member] | Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member] Impaired Loans [Member] | Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member] Impaired Loans [Member] | Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member] Covered Real Estate Owned [Member] | Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member] Covered Real Estate Owned [Member] | Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member] Real Estate Held for Sale [Member] | Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member] Real Estate Held for Sale [Member] | Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member] Impaired Loans [Member] | Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member] Impaired Loans [Member] | Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member] Covered Real Estate Owned [Member] | Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member] Covered Real Estate Owned [Member] | Mar. 31, 2014 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member] Real Estate Held for Sale [Member] | Mar. 31, 2013 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member] Real Estate Held for Sale [Member] | Mar. 31, 2014 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value Total [Member] | Sep. 30, 2013 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value Total [Member] | Mar. 31, 2014 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Sep. 30, 2013 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2014 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Sep. 30, 2013 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Mar. 31, 2014 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Sep. 30, 2013 Equity Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2014 US Treasury and Government [Member] Fair Value, Measurements, Recurring [Member] Fair Value Total [Member] | Sep. 30, 2013 US Treasury and Government [Member] Fair Value, Measurements, Recurring [Member] Fair Value Total [Member] | Mar. 31, 2014 US Treasury and Government [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Sep. 30, 2013 US Treasury and Government [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2014 US Treasury and Government [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Sep. 30, 2013 US Treasury and Government [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Mar. 31, 2014 US Treasury and Government [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Sep. 30, 2013 US Treasury and Government [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2014 Obligations of States and Political Subdivisions [Member] Fair Value, Measurements, Recurring [Member] Fair Value Total [Member] | Sep. 30, 2013 Obligations of States and Political Subdivisions [Member] Fair Value, Measurements, Recurring [Member] Fair Value Total [Member] | Mar. 31, 2014 Obligations of States and Political Subdivisions [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Sep. 30, 2013 Obligations of States and Political Subdivisions [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2014 Obligations of States and Political Subdivisions [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Sep. 30, 2013 Obligations of States and Political Subdivisions [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Mar. 31, 2014 Obligations of States and Political Subdivisions [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Sep. 30, 2013 Obligations of States and Political Subdivisions [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2014 Corporate Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value Total [Member] | Sep. 30, 2013 Corporate Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value Total [Member] | Mar. 31, 2014 Corporate Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Sep. 30, 2013 Corporate Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2014 Corporate Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Sep. 30, 2013 Corporate Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Mar. 31, 2014 Corporate Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Sep. 30, 2013 Corporate Debt Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2014 Collateralized Mortgage Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Mar. 31, 2014 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Fair Value, Measurements, Recurring [Member] Fair Value Total [Member] | Sep. 30, 2013 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Fair Value, Measurements, Recurring [Member] Fair Value Total [Member] | Mar. 31, 2014 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Sep. 30, 2013 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2014 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Sep. 30, 2013 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Mar. 31, 2014 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Sep. 30, 2013 Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2014 Other Commercial Mortgage-Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value Total [Member] | Mar. 31, 2014 Other Commercial Mortgage-Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Mar. 31, 2014 Other Commercial Mortgage-Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Level 3 [Member] | Mar. 31, 2014 Other Commercial Mortgage-Backed Securities [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Mar. 31, 2014 Change During Period, Fair Value Disclosure [Member] Fair Value, Measurements, Nonrecurring [Member] | Mar. 31, 2013 Change During Period, Fair Value Disclosure [Member] Fair Value, Measurements, Nonrecurring [Member] | Mar. 31, 2014 Change During Period, Fair Value Disclosure [Member] Fair Value, Measurements, Nonrecurring [Member] | Mar. 31, 2013 Change During Period, Fair Value Disclosure [Member] Fair Value, Measurements, Nonrecurring [Member] | Mar. 31, 2014 Change During Period, Fair Value Disclosure [Member] Fair Value, Measurements, Nonrecurring [Member] Impaired Loans [Member] | Mar. 31, 2013 Change During Period, Fair Value Disclosure [Member] Fair Value, Measurements, Nonrecurring [Member] Impaired Loans [Member] | Mar. 31, 2014 Change During Period, Fair Value Disclosure [Member] Fair Value, Measurements, Nonrecurring [Member] Impaired Loans [Member] | Mar. 31, 2013 Change During Period, Fair Value Disclosure [Member] Fair Value, Measurements, Nonrecurring [Member] Impaired Loans [Member] | Mar. 31, 2014 Change During Period, Fair Value Disclosure [Member] Fair Value, Measurements, Nonrecurring [Member] Covered Real Estate Owned [Member] | Mar. 31, 2013 Change During Period, Fair Value Disclosure [Member] Fair Value, Measurements, Nonrecurring [Member] Covered Real Estate Owned [Member] | Mar. 31, 2014 Change During Period, Fair Value Disclosure [Member] Fair Value, Measurements, Nonrecurring [Member] Covered Real Estate Owned [Member] | Mar. 31, 2013 Change During Period, Fair Value Disclosure [Member] Fair Value, Measurements, Nonrecurring [Member] Covered Real Estate Owned [Member] | Mar. 31, 2014 Change During Period, Fair Value Disclosure [Member] Fair Value, Measurements, Nonrecurring [Member] Real Estate Held for Sale [Member] | Mar. 31, 2013 Change During Period, Fair Value Disclosure [Member] Fair Value, Measurements, Nonrecurring [Member] Real Estate Held for Sale [Member] | Mar. 31, 2014 Change During Period, Fair Value Disclosure [Member] Fair Value, Measurements, Nonrecurring [Member] Real Estate Held for Sale [Member] | Mar. 31, 2013 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities, at fair value |  | $ 3,110,575,000 | $ 2,360,948,000 | $ 3,110,575,000 | $ 2,360,948,000 | $ 101,496,000 | $ 101,237,000 | $ 0 | $ 0 | $ 3,009,079,000 | $ 2,259,711,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 101,496,000 | $ 101,237,000 | $ 101,496,000 | $ 101,237,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 782,257,000 | $ 533,975,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 782,257,000 | $ 533,975,000 | $ 22,912,000 | $ 22,545,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 22,912,000 | $ 22,545,000 | $ 434,570,000 | $ 452,015,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 434,570,000 | $ 452,015,000 | $ 0 | $ 1,709,873,000 | $ 1,251,176,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 1,709,873,000 | $ 1,251,176,000 | $ 59,467,000 | $ 0 | $ 0 | $ 59,467,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  | 36,551,000 | 114,023,000 | 7,066,000 | 45,966,000 | 2,760,000 | 13,988,000 | 26,725,000 | 54,069,000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 36,551,000 | 114,023,000 | 7,066,000 | 45,966,000 | 2,760,000 | 13,988,000 | 26,725,000 | 54,069,000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Related to Impaired Loans and Real Estate Held for Sale, Measured on Nonrecurring Basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,990,000 | 7,994,000 | 5,975,000 | 25,434,000 | 269,000 | 1,225,000 | (536,000) | 11,038,000 | 64,000 | 281,000 | 129,000 | 372,000 | 2,657,000 | 6,488,000 | 6,382,000 | 14,024,000
Liabilities, Fair Value Disclosure, Recurring | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities, Fair Value Disclosure, Nonrecurring |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of investments | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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 Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + 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=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Subparagraph h -Article 9 Reference 3: 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 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 Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring 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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