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Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Comprehensive Income Loss Reclassification Adjustment From AOCI For Non Credit Other Than Temporary Impaired Securities, Before Tax $ 357,000 $ 1,669,000 $ 14,000
Amortization of non-credit OTTI losses on HTM securities, tax (125,000) (584,000) (5,000)
Amortization on net unrealized gains on HTM securities (580,000) (1,299,000) (1,577,000)
Total HTM Related, Tax 203,000 455,000 552,000
Amount reclassified from AOCI, HTM (377,000) (844,000) (1,025,000)
Total realized gains and losses on AFS disposals, gross (14,016,000) (28,864,000) (23,540,000)
Realized gains and losses on AFS disposals, Tax 4,906,000 10,102,000 8,239,000
Realized gains on available for sale securities (9,110,000) (18,762,000) (15,301,000)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax 7,077,000 1,902,000 4,374,000
Total defined benefit pension and post-retirement life, Gross 9,515,000 (52,234,000) 64,054,000
Total defined benefit pension and post-retirement life,Tax (3,330,000) 18,281,000 (22,419,000)
Total defined benefit pension and post-retirement plans 6,185,000 (33,953,000) $ 41,635,000
Policy acquisition costs [Member]      
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax 5,539,000 1,571,000  
Loss and loss expense incurred [Member]      
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax 1,538,000 331,000  
Net Realized Investment Gains [Member]      
Unrealized gains and losses on HTM disposals 308,000 157,000  
Total realized gains and losses on AFS disposals, gross (14,016,000) (28,864,000)  
Net Income Financial Statement Line Item [Member]      
Amount reclassified from AOCI (4,655,000) (17,285,000)  
Amount reclassified from AOCI, HTM (377,000) (844,000)  
Realized gains on available for sale securities (9,110,000) (18,762,000)  
Net Income Financial Statement Line Item [Member] | Accumulated Defined Benefit Plans Adjustment [Member]      
Total defined benefit pension and post-retirement plans 4,600,000 1,236,000  
Net Income Financial Statement Line Item [Member] | Other-than-Temporary Impairment [Member]      
Amount reclassified from AOCI 232,000 1,085,000  
Total Federal Income Tax Expense [Member]      
Total HTM Related, Tax (203,000) (455,000)  
Realized gains and losses on AFS disposals, Tax 4,906,000 10,102,000  
Total defined benefit pension and post-retirement life,Tax (2,477,000) (666,000)  
Total Federal Income Tax Expense [Member] | Other-than-Temporary Impairment [Member]      
Amortization of non-credit OTTI losses on HTM securities, tax 125,000 584,000  
Income From Continuing Operations Before Federal Income Tax [Member]      
Other Comprehensive Income Loss Reclassification Adjustment From AOCI For Non Credit Other Than Temporary Impaired Securities, Before Tax 357,000 1,669,000  
Amortization on net unrealized gains on HTM securities (580,000) (1,299,000)  
Total realized gains and losses on AFS disposals, gross (14,016,000) (28,864,000)  
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax 7,077,000 1,902,000  
Total defined benefit pension and post-retirement life, Gross 7,077,000 1,902,000  
Net Investment Income Earned [Member]      
Amortization on net unrealized gains on HTM securities (888,000) (1,456,000)  
Non Credit OTTI On Disposed Securities [Member] | Net Realized Investment Gains [Member]      
Other Comprehensive Income Loss Reclassification Adjustment From AOCI For Non Credit Other Than Temporary Impaired Securities, Before Tax $ 357,000 $ 1,669,000