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Investments (Unrealized Losses) (Details) (USD $) In Thousands | Sep. 30, 2011 | Sep. 30, 2010
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Schedule of Investments [Line Items] |  |
Investment securities available for sale, less than 12 months, fair value | $ 1,076,407 |
Investment securities available for sale, 12 months or more, fair value | 2,100 |
Investment securities available for sale, total fair value | 1,078,507 |
Investment securities available for sale, less than 12 months, unrealized losses | 2,583 |
Investment securities available for sale, 12 months or more, unrealized losses | 50 |
Investment securities available for sale, total unrealized losses | 2,633 |
Government Agency Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment securities available for sale, less than 12 months, fair value | 1,051,017 |
Investment securities available for sale, 12 months or more, fair value | 0 |
Investment securities available for sale, total fair value | 1,051,017 |
Investment securities available for sale, less than 12 months, unrealized losses | 2,435 |
Investment securities available for sale, 12 months or more, unrealized losses | 0 |
Investment securities available for sale, total unrealized losses | 2,435 |
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Investment securities available for sale, less than 12 months, fair value | 25,390 | 10,364
Investment securities available for sale, 12 months or more, fair value | 1,675 | 535
Investment securities available for sale, total fair value | 27,065 | 10,899
Investment securities available for sale, less than 12 months, unrealized losses | 148 | 88
Investment securities available for sale, 12 months or more, unrealized losses | 50 | 22
Investment securities available for sale, total unrealized losses | 198 | 110
Investment securities held to maturity, less than 12 months, fair value | 0 | 0
Investment securities held to maturity, 12 months or more, fair value | 22 | 27
Investment securities held to maturity, total fair value | 22 | 27
Investment securities held to maturity, less than 12 months, unrealized losses | 0 | 0
Investment securities held to maturity, 12 months or more, unrealized losses | 26 | 26
Investment securities held to maturity, total unrealized losses | 26 | 26
State, County, Municipal [Member] |  |
Schedule of Investments [Line Items] |  |
Investment securities available for sale, less than 12 months, fair value | 0 |
Investment securities available for sale, 12 months or more, fair value | 425 |
Investment securities available for sale, total fair value | 425 |
Investment securities available for sale, less than 12 months, unrealized losses | 0 |
Investment securities available for sale, 12 months or more, unrealized losses | 0 |
Investment securities available for sale, total unrealized losses | $ 0 |

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