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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Amounts reclassified into net income: non-credit OTTI   $ 469 $ 357 $ 469
Non-credit OTTI, Tax   (164) (125) (164)
Amounts reclassified into Net Income: Non-credit other-than-temporary impairments on disposed securities $ 0 305 232 305
Reclassification of net unrealized gains on HTM securities including disposals and amortization (185) (221) (446) (677)
Total HTM Related, Tax 65 77 156 237
Amounts reclassified from AOCI, HTM Related (120) (144) (290) (440)
Realized losses (gains) on AFS disposals and OTTI 3,422 (5,008) (16,473) (12,237)
Total realized gains on AFS disposals and OTTI (1,197) 1,753 5,766 4,283
Amounts reclassified into net income: realized gains on available for sale securities 2,225 (3,255) (10,707) (7,954)
Amount reclassified into Net Income: Net actuarial loss, Gross 1,709 381 3,418 761
Defined pension and other post-retirement benefit plans, tax (598) (133) (1,196) (266)
Total defined benefit pension and post-retirement plans 1,111 248 2,222 495
Investment Income [Member]        
Amortization of net unrealized gains on HTM securities (272) (272) (583) (752)
Income Before Federal Income Tax [Member]        
Amounts reclassified into net income: non-credit OTTI 0 469 357 469
Reclassification of net unrealized gains on HTM securities including disposals and amortization (185) (221) (446) (677)
Realized losses (gains) on AFS disposals and OTTI 3,422 (5,008) (16,473) (12,237)
Amount reclassified into Net Income: Net actuarial loss, Gross 1,709 381 3,418 761
Total Federal Income Tax Expense [Member]        
Non-credit OTTI, Tax 0 (164) (125) (164)
Total HTM Related, Tax 65 77 156 237
Total realized gains on AFS disposals and OTTI (1,197) 1,753 5,766 4,283
Defined pension and other post-retirement benefit plans, tax (598) (133) (1,196) (266)
Net Income Financial Statement Line Item [Member]        
Amounts reclassified into Net Income: Non-credit other-than-temporary impairments on disposed securities 0 305 232 305
Amounts reclassified from AOCI, HTM Related (120) (144) (290) (440)
Amounts reclassified into net income: realized gains on available for sale securities 2,225 (3,255) (10,707) (7,954)
Total defined benefit pension and post-retirement plans 1,111 248 2,222 495
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 3,216 (2,846) (8,543) (7,594)
Net Realized Investment Gains [Member]        
Unrealized gains and losses on HTM disposals 87 51 137 75
Realized losses (gains) on AFS disposals and OTTI 3,422 (5,008) (16,473) (12,237)
Net Realized Investment Gains [Member] | Non-credit OTTI on Disposed Securities [Member]        
Amounts reclassified into net income: non-credit OTTI 0 469 357 469
Loss And Loss Expense Incurred [Member]        
Amount reclassified into Net Income: Net actuarial loss, Gross 372 88 743 175
Policy acquisition costs [Member]        
Amount reclassified into Net Income: Net actuarial loss, Gross $ 1,337 $ 293 $ 2,675 $ 586