Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Comprehensive Income [Abstract]
Net income, Gross	$ (41,828)	$ 19,546	$ (12,835)	$ 46,787
Unrealized holding gains during the period, Gross	14,712	45,871	43,878	92,569
Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Gross	(81)	(1,237)	517	4,655
Amortization of net unrealized gains on HTM securities, Gross	(664)	(1,383)	(3,097)	(7,938)
Reclassification adjustment for losses (gains) included in net income, Gross	1,907	2,454	(5,986)	840
Net unrealized gains, Gross	15,874	45,705	35,312	90,126
Net actuarial loss, Gross	1,043	1,017	3,252	3,115
Prior service cost, Gross	38	38	113	113
Defined benefit pension and post-retirement plans, Gross	1,081	1,055	3,365	3,228
Comprehensive income, Gross	(24,873)	66,306	25,842	140,141
Net income, Tax	(21,686)	2,349	(16,567)	5,021
Unrealized holding gains during the period, Tax	5,148	16,055	15,357	32,399
Portion of OTTI recognized in OCI, Tax	(28)	(433)	181	1,629
Amortization of net unrealized gains on HTM securities, Tax	(232)	(484)	(1,084)	(2,778)
Reclassification adjustment for losses (gains) included in net income, Tax	668	859	(2,095)	294
Net unrealized gains, Tax	5,556	15,997	12,359	31,544
Net actuarial loss, Tax	365	355	1,138	1,090
Prior Service Cost	14	14	40	40
Defined benefit pension and post-retirement plans, Tax	379	369	1,178	1,130
Comprehensive income, Tax	(15,751)	18,715	(3,030)	37,695
Net income	(20,142)	17,197	3,732	41,766
Unrealized holding gains during the period, Net	9,564	29,816	28,521	60,170
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, net of deferred income tax	(53)	(804)	336	3,026
Amortization of net unrealized gains on HTM securiites, Net	(432)	(899)	(2,013)	(5,160)
Reclassification adjustment for losses (gains) included in net income, Net	1,239	1,595	(3,891)	546
Net Unrealized gains, Net	10,318	29,708	22,953	58,582
Net actuarial loss, Net	678	662	2,114	2,025
Prior service cost, Net	24	24	73	73
Defined benefit pension and post-retirement plans, Net	702	686	2,187	2,098
Comprehensive income, Net	$ (9,122)	$ 47,591	$ 28,872	$ 102,446

Pre-tax amortization of net unrealized holding gain or loss of held-to-maturity securities transferred from the available-for-sale category.

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