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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated other comprehensive income (loss), net of tax        
AOCI (loss), beginning of period     $ (156,059)  
OCI (loss) $ (492) $ (167) (6,470) $ 2,446
AOCI (loss), end of period $ (162,529)   $ (162,529)  
Federal statutory income tax rate        
Corporate tax rate 21.00% 35.00% 21.00% 35.00%
Investment securities:        
Accumulated other comprehensive income (loss), before tax        
AOCI (loss), beginning of period $ (4,157) $ 7,974 $ 3,410 $ 3,954
OCI (loss) before reclassifications (624) 643 (9,163) 5,029
Realized investment losses (gains) 1 (899) 412 (1,447)
Impairment losses     646 182
Cumulative effect of adopting ASU 2016-01     (85)  
OCI (loss) (623) (256) (8,190) 3,764
AOCI (loss), end of period (4,780) 7,718 (4,780) 7,718
Accumulated other comprehensive income (loss), tax        
AOCI (loss), beginning of period (873) 2,791 716 1,384
OCI (loss) before reclassifications (131) 225 (1,924) 1,760
Realized investment losses (gains) 0 (314) 86 (506)
Impairment losses     136 64
Cumulative effect of adopting ASU 2016-01     (18)  
OCI (loss) (131) (89) (1,720) 1,318
AOCI (loss), end of period (1,004) 2,702 (1,004) 2,702
Accumulated other comprehensive income (loss), net of tax        
AOCI (loss), beginning of period (3,284) 5,183 2,694 2,570
OCI (loss) before reclassifications (493) 418 (7,239) 3,269
Realized investment losses (gains) 1 (585) 326 (941)
Impairment losses     510 118
Cumulative effect of adopting ASU 2016-01     (67)  
OCI (loss) (492) (167) (6,470) 2,446
AOCI (loss), end of period (3,776) 5,016 (3,776) 5,016
Pension and other postretirement plans:        
Accumulated other comprehensive income (loss), before tax        
AOCI (loss), beginning of period (200,954) (190,695) (200,954) (190,695)
AOCI (loss), end of period (200,954) (190,695) (200,954) (190,695)
Accumulated other comprehensive income (loss), tax        
AOCI (loss), beginning of period (42,201) (66,744) (42,201) (66,744)
AOCI (loss), end of period (42,201) (66,744) (42,201) (66,744)
Accumulated other comprehensive income (loss), net of tax        
AOCI (loss), beginning of period (158,753) (123,951) (158,753) (123,951)
AOCI (loss), end of period (158,753) (123,951) (158,753) (123,951)
Amount reclassified out of accumulated other comprehensive loss related to postretirement plan items 0 0 0 0
Total        
Accumulated other comprehensive income (loss), before tax        
AOCI (loss), beginning of period (205,111) (182,721) (197,544) (186,741)
OCI (loss) (623) (256) (8,190) 3,764
OCI (loss) 0 0 0 0
OCI (loss) (623) (256) (8,190) 3,764
AOCI (loss), end of period (205,734) (182,977) (205,734) (182,977)
Accumulated other comprehensive income (loss), tax        
AOCI (loss), beginning of period (43,074) (63,953) (41,485) (65,360)
OCI (loss) (131) (89) (1,720) 1,318
OCI (loss) 0 0 0 0
OCI (loss) (131) (89) (1,720) 1,318
AOCI (loss), end of period (43,205) (64,042) (43,205) (64,042)
Accumulated other comprehensive income (loss), net of tax        
AOCI (loss), beginning of period (162,037) (118,768) (156,059) (121,381)
OCI (loss) (492) (167) (6,470) 2,446
OCI (loss) 0 0 0 0
OCI (loss) (492) (167) (6,470) 2,446
AOCI (loss), end of period $ (162,529) $ (118,935) $ (162,529) $ (118,935)