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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated other comprehensive income (loss), before tax      
Amortization of prior service cost $ (696) $ (670)  
Amortization of net actuarial loss (8,111) (14,031)  
Accumulated other comprehensive income (loss), net of tax      
AOCI (loss), beginning of year (96,864)    
OCI (loss) 43 (4,280) $ 823
OCI (loss) 24,560 (25,117) 59,425
OCI (loss) (24,517) 20,837 (58,602)
AOCI (loss), end of year (121,381) (96,864)  
Investment securities:      
Accumulated other comprehensive income (loss), before tax      
AOCI (loss), beginning of year 3,888 10,473 9,206
OCI (loss) before reclassifications (385) (7,651) 1,808
Realized investment losses (gains) 35 (492) (646)
Impairment losses 416 1,558 105
OCI (loss) 66 (6,585) 1,267
AOCI (loss), end of year 3,954 3,888 10,473
Accumulated other comprehensive income (loss), tax      
AOCI (loss), beginning of year 1,361 3,666 3,222
OCI (loss) before reclassifications (135) (2,678) 633
Realized investment losses (gains) 12 (172) (226)
Impairment losses 146 545 37
OCI (loss) 23 (2,305) 444
AOCI (loss), end of year 1,384 1,361 3,666
Accumulated other comprehensive income (loss), net of tax      
AOCI (loss), beginning of year 2,527 6,807 5,984
OCI (loss) before reclassifications (250) (4,973) 1,175
Realized investment losses (gains) 23 (320) (420)
Impairment losses (270) (1,013) (68)
OCI (loss) 43 (4,280) 823
AOCI (loss), end of year 2,570 2,527 6,807
Pension and other postretirement plans:      
Accumulated other comprehensive income (loss), before tax      
AOCI (loss), beginning of year (152,910) (191,552) (100,128)
OCI (loss) before reclassifications (46,244) 24,094 (98,223)
Amortization of prior service cost 695 668 709
Amortization of net actuarial loss 7,764 13,880 6,090
OCI (loss) (37,785) 38,642 (91,424)
AOCI (loss), end of year (190,695) (152,910) (191,552)
Accumulated other comprehensive income (loss), tax      
AOCI (loss), beginning of year (53,519) (67,044) (35,045)
OCI (loss) before reclassifications (16,185) 8,433 (34,378)
Amortization of prior service cost 243 234 248
Amortization of net actuarial loss 2,717 4,858 2,131
OCI (loss) (13,225) 13,525 (31,999)
AOCI (loss), end of year (66,744) (53,519) (67,044)
Accumulated other comprehensive income (loss), net of tax      
AOCI (loss), beginning of year (99,391) (124,508) (65,083)
OCI (loss) before reclassifications (30,059) 15,661 (63,845)
Amortization of prior service cost 452 434 461
Amortization of net actuarial loss 5,047 9,022 3,959
OCI (loss) (24,560) 25,117 (59,425)
AOCI (loss), end of year (123,951) (99,391) (124,508)
Total      
Accumulated other comprehensive income (loss), before tax      
AOCI (loss), beginning of year (149,022) (181,079) (90,922)
OCI (loss) 66 (6,585) 1,267
OCI (loss) (37,785) 38,642 (91,424)
OCI (loss) (37,719) 32,057 (90,157)
AOCI (loss), end of year (186,741) (149,022) (181,079)
Accumulated other comprehensive income (loss), tax      
AOCI (loss), beginning of year (52,158) (63,378) (31,823)
OCI (loss) 23 (2,305) 444
OCI (loss) (13,225) 13,525 (31,999)
OCI (loss) (13,202) 11,220 (31,555)
AOCI (loss), end of year (65,360) (52,158) (63,378)
Accumulated other comprehensive income (loss), net of tax      
AOCI (loss), beginning of year (96,864) (117,701) (59,099)
OCI (loss) 43 (4,280) 823
OCI (loss) (24,560) 25,117 (59,425)
OCI (loss) (24,517) 20,837 (58,602)
AOCI (loss), end of year $ (121,381) $ (96,864) $ (117,701)