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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated other comprehensive income (loss), before tax      
Amortization of prior service costs $ 1,428 $ 1,343  
Amortization of net actuarial loss 16,106 12,125  
Accumulated other comprehensive income (loss), net of tax      
AOCI (loss), beginning of year (78,143)    
Investment securities, OCI (loss) (17,112) 18,738 $ 11,718
Pension and other postretirement plans, OCI (loss) 69,967 19,987 1,698
OCI (loss) 52,855 38,725 13,416
AOCI (loss), end of year (25,288) (78,143)  
Investment securities:      
Accumulated other comprehensive income (loss), before tax      
AOCI (loss), beginning of year 29,384 5,664 (9,169)
OCI (loss) before reclassifications (16,474) 22,074 19,257
Realized investment gains (5,131) (1,335) (4,619)
Impairment (recoveries) losses (57) 2,981 195
Investment securities, OCI (loss) (21,662) 23,720 14,833
AOCI (loss), end of year 7,722 29,384 5,664
Accumulated other comprehensive income (loss), tax      
AOCI (loss), beginning of year 6,171 1,189 (1,926)
OCI (loss) before reclassifications (3,460) 4,636 4,044
Realized investment gains (1,078) (280) (970)
Impairment (recoveries) losses (12) 626 41
Investment securities, OCI (loss) (4,550) 4,982 3,115
AOCI (loss), end of year 1,621 6,171 1,189
Accumulated other comprehensive income (loss), net of tax      
AOCI (loss), beginning of year 23,213 4,475 (7,243)
OCI (loss) before reclassifications (13,014) 17,438 15,213
Realized investment gains (4,053) (1,055) (3,649)
Impairment (recoveries) losses (45) 2,355 154
Investment securities, OCI (loss) (17,112) 18,738 11,718
AOCI (loss), end of year 6,101 23,213 4,475
Pension and other postretirement plans:      
Accumulated other comprehensive income (loss), before tax      
AOCI (loss), beginning of year (128,300) (153,600) (155,749)
OCI (loss) before reclassifications 71,032 11,832 (4,085)
Amortization of prior service costs 1,428 1,343 1,394
Amortization of net actuarial loss 16,106 12,125 4,840
Pension and other postretirement plans, OCI (loss) 88,566 25,300 2,149
AOCI (loss), end of year (39,734) (128,300) (153,600)
Accumulated other comprehensive income (loss), tax      
AOCI (loss), beginning of year (26,944) (32,257) (32,708)
OCI (loss) before reclassifications 14,917 2,485 (858)
Amortization of prior service costs 300 282 293
Amortization of net actuarial loss 3,382 2,546 1,016
Pension and other postretirement plans, OCI (loss) 18,599 5,313 451
AOCI (loss), end of year (8,345) (26,944) (32,257)
Accumulated other comprehensive income (loss), net of tax      
AOCI (loss), beginning of year (101,356) (121,343) (123,041)
OCI (loss) before reclassifications 56,115 9,347 (3,227)
Amortization of prior service costs 1,128 1,061 1,101
Amortization of net actuarial loss 12,724 9,579 3,824
Pension and other postretirement plans, OCI (loss) 69,967 19,987 1,698
AOCI (loss), end of year (31,389) (101,356) (121,343)
Total      
Accumulated other comprehensive income (loss), before tax      
AOCI (loss), beginning of year (98,916) (147,936) (164,918)
Investment securities, OCI (loss) (21,662) 23,720 14,833
Pension and other postretirement plans, OCI (loss) 88,566 25,300 2,149
OCI (loss) 66,904 49,020 16,982
AOCI (loss), end of year (32,012) (98,916) (147,936)
Accumulated other comprehensive income (loss), tax      
AOCI (loss), beginning of year (20,773) (31,068) (34,634)
Investment securities, OCI (loss) (4,550) 4,982 3,115
Pension and other postretirement plans, OCI (loss) 18,599 5,313 451
OCI (loss) 14,049 10,295 3,566
AOCI (loss), end of year (6,724) (20,773) (31,068)
Accumulated other comprehensive income (loss), net of tax      
AOCI (loss), beginning of year (78,143) (116,868) (130,284)
Investment securities, OCI (loss) (17,112) 18,738 11,718
Pension and other postretirement plans, OCI (loss) 69,967 19,987 1,698
OCI (loss) 52,855 38,725 13,416
AOCI (loss), end of year $ (25,288) $ (78,143) $ (116,868)