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Derivatives (Tables) | 3 Months Ended
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Mar. 31, 2013
Derivative [Line Items] |
Schedule Of Accumulated Other Comprehensive Income (Loss) | Accumulated other comprehensive loss included the following as of March 31, 2013, December 31, 2012, and March 31, 2012:
| March 31, 2013 |  | December 31, 2012 |  | March 31, 2012
| Accumulated other comprehensive income (loss) |  | Deferred tax expense (benefit) |  | Accumulated other comprehensive income (loss), net of tax |  | Accumulated other comprehensive income (loss) |  | Deferred tax expense (benefit) |  | Accumulated other comprehensive income (loss), net of tax |  | Accumulated other comprehensive income (loss) |  | Deferred tax expense (benefit) |  | Accumulated other comprehensive income (loss), net of tax
Unrealized gains on investment securities available for sale | $ | 32,333 |  |  | $ | 12,727 |  |  | $ | 19,606 |  |  | $ | 33,809 |  |  | $ | 13,292 |  |  | $ | 20,517 |  |  | $ | 23,667 |  |  | $ | 9,327 |  |  | $ | 14,340 |
Funded status of defined benefit plan | (154,030 | ) |  | (60,318 | ) |  | (93,712 | ) |  | (158,334 | ) |  | (62,003 | ) |  | (96,331 | ) |  | (122,465 | ) |  | (47,957 | ) |  | (74,508 | )
Unrealized loss on cash flow hedge | (9,583 | ) |  | (3,784 | ) |  | (5,799 | ) |  | (10,398 | ) |  | (4,106 | ) |  | (6,292 | ) |  | (10,325 | ) |  | (4,077 | ) |  | (6,248 | )
Total | $ | (131,280 | ) |  | $ | (51,375 | ) |  | $ | (79,905 | ) |  | $ | (134,923 | ) |  | $ | (52,817 | ) |  | $ | (82,106 | ) |  | $ | (109,123 | ) |  | $ | (42,707 | ) |  | $ | (66,416 | )
|  | Gains and losses on cash flow hedges 1 |  | Unrealized gains and losses on available-for-sale securities 1 |  | Defined benefit pension items 1 |  | Total
Three months ended March 31, 2013 |  |  |  |  |  |  |  |
Beginning balance |  | $ | (6,292 | ) |  | $ | 20,517 |  |  | $ | (96,331 | ) |  | $ | (82,106 | )
Other comprehensive income before reclassifications |  | 1 |  |  | (876 | ) |  | — |  |  | (875 | )
Amounts reclassified from accumulated other comprehensive income |  | 492 |  |  | (35 | ) |  | 2,619 |  |  | 3,076 |
Net current period other comprehensive income |  | 493 |  |  | (911 | ) |  | 2,619 |  |  | 2,201 |
Ending balance |  | $ | (5,799 | ) |  | $ | 19,606 |  |  | $ | (93,712 | ) |  | $ | (79,905 | )
Three months ended March 31, 2012 |  |  |  |  |  |  |  |
Beginning balance |  | $ | (6,483 | ) |  | $ | 16,115 |  |  | $ | (76,206 | ) |  | $ | (66,574 | )
Other comprehensive income before reclassifications |  | (218 | ) |  | (1,775 | ) |  | — |  |  | (1,993 | )
Amounts reclassified from accumulated other comprehensive income |  | 453 |  |  | — |  |  | 1,698 |  |  | 2,151 |
Net current period other comprehensive income |  | 235 |  |  | (1,775 | ) |  | 1,698 |  |  | 158 |
Ending balance |  | $ | (6,248 | ) |  | $ | 14,340 |  |  | $ | (74,508 | ) |  | $ | (66,416 | )
1 All amounts are net of tax. Amounts in parentheses indicate debits.
Interest Rate Swap |
Derivative [Line Items] |
Schedule Of Interest Rate Swaps |
| March 31, 2013 |  | December 31, 2012 |  | March 31, 2012
| Notional amount |  | Estimated fair value of liability |  | Notional amount |  | Estimated fair value of liability |  | Notional amount |  | Estimated fair value of liability
2011 interest rate swap hedging variable rate exposure on trust preferred securities 2011-2016 | $ | 93,500 |  |  | $ | 9,583 |  |  | $ | 93,500 |  |  | $ | 10,398 |  |  | $ | 93,500 |  |  | $ | 10,325 |
Schedule Of Accumulated Other Comprehensive Income (Loss) | The following table discloses activity in accumulated other comprehensive income (loss) related to the interest rate swaps during the three-month periods ended March 31, 2013, and 2012.
| 2013 |  | 2012
Accumulated other comprehensive loss resulting from interest rate swaps as of January 1 | $ | (10,398 | ) |  | $ | (10,714 | )
Other comprehensive income recognized during the three-month period ended March 31 | 815 |  |  | 389 |
Accumulated other comprehensive loss resulting from interest rate swaps as of March 31 | $ | (9,583 | ) |  | $ | (10,325 | )

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