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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (22,225) $ (18,999) $ (6,295) $ 5,621
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 626 (12,377) (11,123)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [1] 230 (327) (793)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 856 (12,704) (11,916)  
Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (19,779) (12,704) 386 7,462
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (3,391) (12,338) (6,069)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [1] 7 (752) (1,007)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (3,384) (13,090) (7,076)  
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (2,446) (6,295) (6,681) $ (1,841)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 4,017 (39) (5,054)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [1] 223 425 214  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 4,240 $ 386 $ (4,840)  
Accounting Standards Update 2018-02 [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative Effect of New Accounting Principle in Period of Adoption 0      
Accounting Standards Update 2018-02 [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative Effect of New Accounting Principle in Period of Adoption (3,691)      
Accounting Standards Update 2018-02 [Member] | Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative Effect of New Accounting Principle in Period of Adoption (391)      
Accounting Standards Update 2018-02 [Member] | Accumulated Other Comprehensive Income [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Cumulative Effect of New Accounting Principle in Period of Adoption $ (4,082)      
[1] (2) See following table for details about these reclassifications.