Comprehensive Income (Reclassification out of AOCI) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Amounts reclassified into net income: non-credit OTTI	$ 1,200	$ 1	$ 1,669	$ 14
Non-credit OTTI, Tax	(420)	0	(584)	(5)
Amounts reclassified into Net Income: Non-credit other-than-temporary impairments	780	1	1,085	9
Total HTM Related, Tax	130	165	367	631
Amounts reclassified from AOCI, HTM Related	(243)	(307)	(683)	(1,172)
Realized gains on AFS disposals and OTTI	(16,435)	(13,516)	(28,672)	(24,780)
Total realized gains on AFS disposals and OTTI	5,752	4,731	10,035	8,673
Amounts reclassified into net income: realized gains on available for sale securities	(10,683)	(8,785)	(18,637)	(16,107)
Amount reclassified into Net Income: Net actuarial loss, Gross	381	790	1,142	3,419
Defined pension and other post-retirement benefit plans, tax	(134)	(277)	(400)	(16,606)
Amount reclassified into Net Income: Prior service cost, Gross				10
Amount reclassified into Net Income: Curtailment expense				16
Defined pension and other post-retirement benefit plans, gross	381	790	1,142	47,445
Total defined benefit pension and post-retirement plans	247	513	742	30,839
Net Investment Income Earned [Member]
Amortization of net unrealized gains on HTM securities	(385)	(453)	(1,137)	(1,633)
Net Investment Income Earned [Member] | Amortization Of Non Credit OTTI Losses On HTM Securities [Member]
Amounts reclassified into net income: non-credit OTTI	0	1	0	14
Income From Continuing Operations Before Federal Income Tax [Member]
Amounts reclassified into net income: non-credit OTTI	1,200	1	1,669	14
Amortization of net unrealized gains on HTM securities	(373)	(472)	(1,050)	(1,803)
Realized gains on AFS disposals and OTTI	(16,435)	(13,516)	(28,672)	(24,780)
Amount reclassified into Net Income: Net actuarial loss, Gross	381	790	1,142	3,419
Amount reclassified into Net Income: Prior service cost, Gross	0	0	0	10
Amount reclassified into Net Income: Curtailment expense	0	0	0	16
Defined pension and other post-retirement benefit plans, gross	381	790	1,142	3,445
Total Federal Income Tax Expense [Member]
Non-credit OTTI, Tax	(420)	0	(584)	(5)
Total HTM Related, Tax	130	165	367	631
Total realized gains on AFS disposals and OTTI	5,752	4,731	10,035	8,673
Defined pension and other post-retirement benefit plans, tax	(134)	(277)	(400)	(1,206)
Net Income Financial Statement Line Item [Member]
Amounts reclassified into Net Income: Non-credit other-than-temporary impairments	780	1	1,085	9
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(9,899)	(8,578)	(17,493)	(15,031)
Amounts reclassified from AOCI, HTM Related	(243)	(307)	(683)	(1,172)
Amounts reclassified into net income: realized gains on available for sale securities	(10,683)	(8,785)	(18,637)	(16,107)
Total defined benefit pension and post-retirement plans	247	513	742	2,239
Net Realized Investment Gains [Member]
Unrealized gains and losses on HTM disposals	12	(19)	87	(170)
Realized gains on AFS disposals and OTTI	(16,435)	(13,516)	(28,672)	(24,780)
Net Realized Investment Gains [Member] | Non-credit OTTI on Disposed Securities [Member]
Amounts reclassified into net income: non-credit OTTI	1,200	0	1,669	0
Loss And Loss Expense Incurred [Member]
Amount reclassified into Net Income: Net actuarial loss, Gross	88	159	263	717
Amount reclassified into Net Income: Prior service cost, Gross	0	0	0	7
Policy acquisition costs [Member]
Amount reclassified into Net Income: Net actuarial loss, Gross	293	631	879	2,702
Amount reclassified into Net Income: Prior service cost, Gross	0	0	0	3
Amount reclassified into Net Income: Curtailment expense	$ 0	$ 0	$ 0	$ 16