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Derivatives (Tables) | 3 Months Ended
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Mar. 31, 2012
Derivative [Line Items] |
Schedule Of Accumulated Other Comprehensive Income (Loss) | Accumulated other comprehensive income (loss) included the following as of March 31, 2012, December 31, 2011 and March 31, 2011:
| March 31, 2012 |  | December 31, 2011 |  | March 31, 2011
| 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 | $ | 23,667 |  |  | $ | 9,327 |  |  | $ | 14,340 |  |  | $ | 26,565 |  |  | $ | 10,450 |  |  | $ | 16,115 |  |  | $ | 13,856 |  |  | $ | 5,223 |  |  | $ | 8,633 |
Funded status of defined benefit plan | (122,465 | ) |  | (47,957 | ) |  | (74,508 | ) |  | (125,255 | ) |  | (49,049 | ) |  | (76,206 | ) |  | (72,694 | ) |  | (28,859 | ) |  | (43,835 | )
Unrealized loss on cash flow hedge | (10,325 | ) |  | (4,077 | ) |  | (6,248 | ) |  | (10,714 | ) |  | (4,231 | ) |  | (6,483 | ) |  | (7,775 | ) |  | (3,070 | ) |  | (4,705 | )
Total | $ | (109,123 | ) |  | $ | (42,707 | ) |  | $ | (66,416 | ) |  | $ | (109,404 | ) |  | $ | (42,830 | ) |  | $ | (66,574 | ) |  | $ | (66,613 | ) |  | $ | (26,706 | ) |  | $ | (39,907 | )
Interest Rate Swap [Member] |
Derivative [Line Items] |
Schedule Of Interest Rate Swaps |
| March 31, 2012 |  | December 31, 2011 |  | March 31, 2011
| Notional amount |  | Estimated fair value of liability |  | Notional amount |  | Estimated fair value of liability |  | Notional amount |  | Estimated fair value of liability
2006 interest rate swap hedging variable rate exposure on trust preferred securities 2006-2011 | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 115,000 |  |  | $ | 1,450 |
2009 interest rate swap hedging variable rate exposure on trust preferred securities 2011 | — |  |  | — |  |  | — |  |  | — |  |  | 115,000 |  |  | 6,325 |
2011 interest rate swap hedging variable rate exposure on trust preferred securities 2011-2016 | 93,500 |  |  | 10,325 |  |  | 93,500 |  |  | 10,714 |  |  | — |  |  | — |
|  |  | $ | 10,325 |  |  |  |  | $ | 10,714 |  |  |  |  | $ | 7,775 |
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, 2012 and 2011.
| 2012 |  | 2011
Accumulated other comprehensive loss resulting from interest rate swaps as of January 1 | $ | (10,714 | ) |  | $ | (9,492 | )
Other comprehensive income (loss) recognized during three month period ended March 31 | 389 |  |  | 1,717 |
Accumulated other comprehensive loss resulting from interest rate swaps as of March 31 | $ | (10,325 | ) |  | $ | (7,775 | )

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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41620-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41641-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579240-113959 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41678-113959 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41638-113959 + Details
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