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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated other comprehensive income (loss), before tax      
Amortization of prior service costs $ 1,446 $ 1,443 $ 1,428
Amortization of net actuarial (gain) loss (15,331) 7,320 16,106
Accumulated other comprehensive income (loss), net of tax      
AOCI (loss), beginning of year (7,414)    
Investment securities, OCI (loss) 27,784 (58,692) (17,112)
Pension and other postretirement plans, OCI (loss) (33,770) 76,566 69,967
OCI (loss) (5,986) 17,874 52,855
AOCI (loss), end of year (13,400) (7,414)  
Total      
Accumulated other comprehensive income (loss), before tax      
AOCI (loss), beginning of year (9,385) (32,012) (98,916)
Investment securities, OCI (loss) 35,169 (74,293) (21,662)
Pension and other postretirement plans, OCI (loss) (42,747) 96,920 88,566
OCI (loss) (7,578) 22,627 66,904
AOCI (loss), end of year (16,963) (9,385) (32,012)
Accumulated other comprehensive income (loss), tax      
AOCI (loss), beginning of year (1,971) (6,724) (20,773)
Investment securities, OCI (loss) 7,385 (15,601) (4,550)
Pension and other postretirement plans, OCI (loss) (8,977) 20,354 18,599
OCI (loss) (1,592) 4,753 14,049
AOCI (loss), end of year (3,563) (1,971) (6,724)
Accumulated other comprehensive income (loss), net of tax      
AOCI (loss), beginning of year (7,414) (25,288) (78,143)
Investment securities, OCI (loss) 27,784 (58,692) (17,112)
Pension and other postretirement plans, OCI (loss) (33,770) 76,566 69,967
OCI (loss) (5,986) 17,874 52,855
AOCI (loss), end of year (13,400) (7,414) (25,288)
Investment securities:      
Accumulated other comprehensive income (loss), before tax      
AOCI (loss), beginning of year (66,571) 7,722 29,384
OCI (loss) before reclassifications 26,021 (89,010) (16,474)
Realized investment losses (gains) 6,719 14,050 (5,131)
Impairment losses (recoveries) 2,429 667 (57)
Investment securities, OCI (loss) 35,169 (74,293) (21,662)
AOCI (loss), end of year (31,402) (66,571) 7,722
Accumulated other comprehensive income (loss), tax      
AOCI (loss), beginning of year (13,980) 1,621 6,171
OCI (loss) before reclassifications 5,464 (18,692) (3,460)
Realized investment losses (gains) 1,411 2,951 (1,078)
Impairment losses (recoveries) 510 140 (12)
Investment securities, OCI (loss) 7,385 (15,601) (4,550)
AOCI (loss), end of year (6,595) (13,980) 1,621
Accumulated other comprehensive income (loss), net of tax      
AOCI (loss), beginning of year (52,591) 6,101 23,213
OCI (loss) before reclassifications 20,557 (70,318) (13,014)
Realized investment losses (gains) 5,308 11,099 (4,053)
Impairment losses (recoveries) 1,919 527 (45)
Investment securities, OCI (loss) 27,784 (58,692) (17,112)
AOCI (loss), end of year (24,807) (52,591) 6,101
Pension and other postretirement plans:      
Accumulated other comprehensive income (loss), before tax      
AOCI (loss), beginning of year 57,186 (39,734) (128,300)
OCI (loss) before reclassifications (28,862) 88,148 71,032
Amortization of prior service costs 1,446 1,443 1,428
Amortization of net actuarial (gain) loss (15,331) 7,329 16,106
Pension and other postretirement plans, OCI (loss) (42,747) 96,920 88,566
AOCI (loss), end of year 14,439 57,186 (39,734)
Accumulated other comprehensive income (loss), tax      
AOCI (loss), beginning of year 12,009 (8,345) (26,944)
OCI (loss) before reclassifications (6,061) 18,511 14,917
Amortization of prior service costs 304 303 300
Amortization of net actuarial (gain) loss (3,220) 1,540 3,382
Pension and other postretirement plans, OCI (loss) (8,977) 20,354 18,599
AOCI (loss), end of year 3,032 12,009 (8,345)
Accumulated other comprehensive income (loss), net of tax      
AOCI (loss), beginning of year 45,177 (31,389) (101,356)
OCI (loss) before reclassifications (22,801) 69,637 56,115
Amortization of prior service costs 1,142 1,140 1,128
Amortization of net actuarial (gain) loss (12,111) 5,789 12,724
Pension and other postretirement plans, OCI (loss) (33,770) 76,566 69,967
AOCI (loss), end of year $ 11,407 $ 45,177 $ (31,389)