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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated other comprehensive income (loss), net of tax    
AOCI (loss), beginning of year $ (121,381)  
OCI 1,521 $ 3,465
AOCI (loss), end of year (119,860)  
Investment securities:    
Accumulated other comprehensive income (loss), before tax    
AOCI (loss), beginning of year 3,954 3,888
OCI before reclassifications 2,640 3,503
Realized investment (gains) losses (422) 1,483
Impairment losses 121 345
OCI 2,339 5,331
AOCI (loss), end of year 6,293 9,219
Accumulated other comprehensive income (loss), tax    
AOCI (loss), beginning of year 1,384 1,361
OCI before reclassifications 924 1,226
Realized investment (gains) losses (148) 519
Impairment losses 42 121
OCI 818 1,866
AOCI (loss), end of year 2,202 3,227
Accumulated other comprehensive income (loss), net of tax    
AOCI (loss), beginning of year 2,570 2,527
OCI before reclassifications 1,716 2,277
Realized investment (gains) losses (274) 964
Impairment losses (79) (224)
OCI 1,521 3,465
AOCI (loss), end of year 4,091 5,992
Pension and other postretirement plans:    
Accumulated other comprehensive income (loss), before tax    
AOCI (loss), beginning of year (190,695) (152,910)
OCI before reclassifications 0 0
Amortization of prior service costs 0 0
Amortization of net actuarial loss 0 0
OCI 0 0
AOCI (loss), end of year (190,695) (152,910)
Accumulated other comprehensive income (loss), tax    
AOCI (loss), beginning of year (66,744) (53,519)
OCI before reclassifications 0 0
Amortization of prior service costs 0 0
Amortization of net actuarial loss 0 0
OCI 0 0
AOCI (loss), end of year (66,744) (53,519)
Accumulated other comprehensive income (loss), net of tax    
AOCI (loss), beginning of year (123,951) (99,391)
OCI before reclassifications 0 0
Amortization of prior service costs 0 0
Amortization of net actuarial loss 0 0
OCI 0 0
AOCI (loss), end of year (123,951) (99,391)
Total    
Accumulated other comprehensive income (loss), before tax    
AOCI (loss), beginning of year (186,741) (149,022)
OCI 2,339 5,331
OCI 0 0
OCI 2,339 5,331
AOCI (loss), end of year (184,402) (143,691)
Accumulated other comprehensive income (loss), tax    
AOCI (loss), beginning of year (65,360) (52,158)
OCI 818 1,866
OCI 0 0
OCI 818 1,866
AOCI (loss), end of year (64,542) (50,292)
Accumulated other comprehensive income (loss), net of tax    
AOCI (loss), beginning of year (121,381) (96,864)
OCI 1,521 3,465
OCI 0 0
OCI 1,521 3,465
AOCI (loss), end of year $ (119,860) $ (93,399)