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Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | $ 347,872 |
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 2,128 |
Securities Available-for-Sale, 12 months or longer, Fair value | 74 |
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 29 |
Securities Available-for-Sale, Fair value, Total | 347,946 |
Securities Available-for-Sale, Unrealized losses, Total | 2,157 |
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | 347,872 |
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 2,128 |
Securities Available-for-Sale, Fair value, Total | 347,872 |
Securities Available-for-Sale, Unrealized losses, Total | 2,128 |
Other Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value |  |
Securities Available-for-Sale, Less than 12 months, Unrealized losses |  |
Securities Available-for-Sale, 12 months or longer, Fair value | 74 | 80
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 29 | 32
Securities Available-for-Sale, Fair value, Total | 74 | 80
Securities Available-for-Sale, Unrealized losses, Total | 29 | 32
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Held-to-Maturity, Less than 12 months, Fair value | 62,420 |
Securities Held-to-Maturity, Less than 12 months, Unrealized losses | 280 |
Securities Held-to-Maturity, 12 months or longer, Fair value |  | 38,775
Securities Held-to-Maturity, 12 months or longer, Unrealized losses |  | 32
Securities Held-to-Maturity, Fair value, Total | 62,420 | 38,775
Securities Held-to-Maturity, Unrealized losses, Total | $ 280 | $ 32

X
- Definition Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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