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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) (USD $) In Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010
Comprehensive Income [Abstract] |  |  |  |
Net income, Gross | $ 1,221 | $ 20,810 | $ 28,993 | $ 27,241
Unrealized holding gains during the period, Gross | 30,099 | 31,498 | 29,166 | 46,698
Portion of OTTI recognized in OCI, Gross | 418 | 3,617 | 598 | 5,892
Amortization of net unrealized gains on HTM securities, Gross | (1,258) | (802) | (2,433) | (6,555)
Reclassification adjustment for (gains) losses included in net income, Gross | (2,144) | 783 | (7,893) | (1,614)
Net unrealized gains, Gross | 27,115 | 35,096 | 19,438 | 44,421
Net actuarial loss, Gross | 1,104 | 1,172 | 2,209 | 2,098
Prior service cost, Gross | 38 | 38 | 75 | 75
Defined benefit pension and post-retirement plans, Gross | 1,142 | 1,210 | 2,284 | 2,173
Comprehensive income, Gross | 29,478 | 57,116 | 50,715 | 73,835
Net income, Tax | (1,104) | 2,044 | 5,119 | 2,672
Unrealized holding gains during the period, Tax | 10,536 | 11,024 | 10,209 | 16,344
Portion of OTTI recognized in OCI, Tax | 146 | 1,265 | 209 | 2,062
Amortization of net unrealized gains on HTM securities, Tax | (441) | (280) | (852) | (2,294)
Reclassification adjustment for (gains) losses included in net income, Tax | (751) | 274 | (2,763) | (565)
Net unrealized gains, Tax | 9,490 | 12,283 | 6,803 | 15,547
Net actuarial loss, Tax | 386 | 411 | 773 | 735
Prior service cost, Tax | 13 | 13 | 26 | 26
Defined benefit pension and post-retirement plans, Tax | 399 | 424 | 799 | 761
Comprehensive income, Tax | 8,785 | 14,751 | 12,721 | 18,980
Net income | 2,325 | 18,766 | 23,874 | 24,569
Unrealized holding gains during the period, Net | 19,563 | 20,474 | 18,957 | 30,354
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, net of deferred income tax | 272 | 2,352 | 389 | 3,830
Amortization of net unrealized gains on HTM securiites, Net | (817) | (522) | (1,581) | (4,261)
Reclassification adjustment for (gains) losses included in net income, Net | (1,393) | 509 | (5,130) | (1,049)
Net Unrealized gains, Net | 17,625 | 22,813 | 12,635 | 28,874
Net actuarial loss, Net | 718 | 761 | 1,436 | 1,363
Prior service cost, Net | 25 | 25 | 49 | 49
Defined benefit pension and post-retirement plans, Net | 743 | 786 | 1,485 | 1,412
Comprehensive income, Net | $ 20,693 | $ 42,365 | $ 37,994 | $ 54,855

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