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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated other comprehensive income (loss), net of tax        
AOCI (loss), beginning of period     $ (156,059)  
OCI (loss) $ (551) $ 1,092 (5,978) $ 2,613
AOCI (loss), end of period $ (162,037)   $ (162,037)  
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 $ (3,460) $ 6,293 $ 3,410 $ 3,954
OCI (loss) before reclassifications (1,409) 1,746 (8,539) 4,386
Realized investment losses (gains) 66 (126) 411 (548)
Impairment losses 646 61 646 182
Cumulative effect of adopting ASU 2016-01     (85)  
OCI (loss) (697) 1,681 (7,567) 4,020
AOCI (loss), end of period (4,157) 7,974 (4,157) 7,974
Accumulated other comprehensive income (loss), tax        
AOCI (loss), beginning of period (727) 2,202 716 1,384
OCI (loss) before reclassifications (296) 611 (1,793) 1,535
Realized investment losses (gains) 14 (44) 86 (192)
Impairment losses 136 22 136 64
Cumulative effect of adopting ASU 2016-01     (18)  
OCI (loss) (146) 589 (1,589) 1,407
AOCI (loss), end of period (873) 2,791 (873) 2,791
Accumulated other comprehensive income (loss), net of tax        
AOCI (loss), beginning of period (2,733) 4,091 2,694 2,570
OCI (loss) before reclassifications (1,113) 1,135 (6,746) 2,851
Realized investment losses (gains) 52 (82) 325 (356)
Impairment losses 510 39 510 118
Cumulative effect of adopting ASU 2016-01     (67)  
OCI (loss) (551) 1,092 (5,978) 2,613
AOCI (loss), end of period (3,284) 5,183 (3,284) 5,183
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 (204,414) (184,402) (197,544) (186,741)
OCI (loss) (697) 1,681 (7,567) 4,020
OCI (loss) 0 0 0 0
OCI (loss) (697) 1,681 (7,567) 4,020
AOCI (loss), end of period (205,111) (182,721) (205,111) (182,721)
Accumulated other comprehensive income (loss), tax        
AOCI (loss), beginning of period (42,928) (64,542) (41,485) (65,360)
OCI (loss) (146) 589 (1,589) 1,407
OCI (loss) 0 0 0 0
OCI (loss) (146) 589 (1,589) 1,407
AOCI (loss), end of period (43,074) (63,953) (43,074) (63,953)
Accumulated other comprehensive income (loss), net of tax        
AOCI (loss), beginning of period (161,486) (119,860) (156,059) (121,381)
OCI (loss) (551) 1,092 (5,978) 2,613
OCI (loss) 0 0 0 0
OCI (loss) (551) 1,092 (5,978) 2,613
AOCI (loss), end of period $ (162,037) $ (118,768) $ (162,037) $ (118,768)