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

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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Non-credit portion of other-than-temporary impairment losses on fixed maturity securities recognized in other comprehensive income, net of deferred income tax. This item includes subsequent changes to these securities such as amortization on HTM securities or subsequent sales. This item does not include subsequent changes in appreciation or loss in value.

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Gross appreciation or the gross loss in value of the total of unsold fixed maturity and equity securities during the period being reported, net of tax (except when designated as a fair value hedge). This includes certain changes in the unrealized holding gain or loss for held-to-maturity securities transferred from the available-for-sale category.

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Tax effect of the gross appreciation or the gross loss in value of the total of unsold fixed maturity and equity securities during the period being reported (except when designated as a fair value hedge). This includes certain changes in the unrealized holding gain or loss for held-to-maturity securities transferred from the available-for-sale category.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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The net prior service cost or credit recognized in other comprehensive income that is a reclassification adjustment of other comprehensive income as a result of being recognized as a component of net periodic benefit cost for the period.

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The adjustment out of other comprehensive income for prior service costs recognized as a component of net period benefit cost during the period, after tax.

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Tax effect on adjustment out of other comprehensive income for prior service costs recognized as a component of net period benefit cost during the period.

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Amounts recognized in other comprehensive income (but not yet recognized in net periodic benefit cost), including the net gain (loss) and net prior service cost (credit) arising during the period. Also includes reclassification adjustments out of other comprehensive income as a result of being recognized as components of net periodic benefit cost for the period.

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Net changes to accumulated comprehensive income during the period related to benefit plans, after tax.

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Tax effects of the net changes to accumulated comprehensive income during the period related to benefit plans.

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Pre tax reclassification adjustment for gains or losses realized upon the sale of securities.

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Reclassification adjustment for unrealized gains or losses realized upon the sale of securities, after tax.

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The net gain or loss previously recognized in other comprehensive income that is a reclassification adjustment of other comprehensive income as a result of being recognized as a component of net periodic benefit cost for the period.

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For each annual statement of income presented, the tax effect of the net gain or loss recognized in other comprehensive income that is a reclassification adjustment of other comprehensive income as a result of being recognized as a component of net periodic benefit cost for the period.

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