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Accumulated Other Comprehensive Income (Loss) (Schedule Of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands | Sep. 30, 2011 | Dec. 31, 2010 | Sep. 30, 2010
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Accumulated other comprehensive income (loss), net of tax | $ (32,527) | [1] | $ (36,529) | [2] | $ (24,333) | [1]
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |
Accumulated other comprehensive income (loss) | (53,453) |  | (59,993) |  | (41,121) |
Deferred tax expense (benefit) | (20,926) |  | (23,464) |  | (16,788) |
Accumulated other comprehensive income (loss), net of tax | (32,527) |  | (36,529) |  | (24,333) |
Unrealized gains on investment securities available for sale [Member] |  |  |  |  |  |
Accumulated other comprehensive income (loss) | 28,830 |  | 23,195 |  | 41,026 |
Deferred tax expense (benefit) | 11,340 |  | 9,143 |  | 15,427 |
Accumulated other comprehensive income (loss), net of tax | 17,490 |  | 14,052 |  | 25,599 |
Funded status of defined benefit plan [Member] |  |  |  |  |  |
Accumulated other comprehensive income (loss) | (68,752) |  | (73,696) |  | (67,884) |
Deferred tax expense (benefit) | (26,923) |  | (28,859) |  | (26,583) |
Accumulated other comprehensive income (loss), net of tax | (41,829) |  | (44,837) |  | (41,301) |
Unrealized loss on cash flow hedges [Member] |  |  |  |  |  |
Accumulated other comprehensive income (loss) | (13,531) |  | (9,492) |  | (14,263) |
Deferred tax expense (benefit) | (5,343) |  | (3,748) |  | (5,632) |
Accumulated other comprehensive income (loss), net of tax | $ (8,188) |  | $ (5,744) |  | $ (8,631) |
[1] | Unaudited
[2] | Derived from 2010 Annual Report on Form 10-K.

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