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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated other comprehensive income (loss), before tax |  |  |
Amortization of prior service costs | $ 1,611 | $ 1,446 | $ 1,443
Amortization of net actuarial (gain) loss | (6,859) | (15,331) | 7,320
Settlement gain | (1,338) | 0 | 0
Accumulated other comprehensive income (loss), net of tax |  |  |
AOCI (loss), beginning of year | (13,400) |  |
Investment securities, OCI (loss) | 7,079 | 27,784 | (58,692)
Pension and other postretirement plans, OCI (loss) | (41,270) | (33,770) | 76,566
OCI (loss) | (34,191) | (5,986) | 17,874
AOCI (loss), end of year | (47,591) | (13,400) |
Total |  |  |
Accumulated other comprehensive income (loss), before tax |  |  |
AOCI (loss), beginning of year | (16,963) | (9,385) | (32,012)
Investment securities, OCI (loss) | 8,960 | 35,169 | (74,293)
Pension and other postretirement plans, OCI (loss) | (52,241) | (42,747) | 96,920
OCI (loss) | (43,281) | (7,578) | 22,627
AOCI (loss), end of year | (60,244) | (16,963) | (9,385)
Accumulated other comprehensive income (loss), tax |  |  |
AOCI (loss), beginning of year | (3,563) | (1,971) | (6,724)
Investment securities, OCI (loss) | 1,881 | 7,385 | (15,601)
Pension and other postretirement plans, OCI (loss) | (10,971) | (8,977) | 20,354
OCI (loss) | (9,090) | (1,592) | 4,753
AOCI (loss), end of year | (12,653) | (3,563) | (1,971)
Accumulated other comprehensive income (loss), net of tax |  |  |
AOCI (loss), beginning of year | (13,400) | (7,414) | (25,288)
Investment securities, OCI (loss) | 7,079 | 27,784 | (58,692)
Pension and other postretirement plans, OCI (loss) | (41,270) | (33,770) | 76,566
OCI (loss) | (34,191) | (5,986) | 17,874
AOCI (loss), end of year | (47,591) | (13,400) | (7,414)
Investment securities: |  |  |
Accumulated other comprehensive income (loss), before tax |  |  |
AOCI (loss), beginning of year | (31,402) | (66,571) | 7,722
OCI (loss) before reclassifications | 6,557 | 26,021 | (89,010)
Realized investment losses | 1,620 | 6,719 | 14,050
Impairment losses | 783 | 2,429 | 667
Investment securities, OCI (loss) | 8,960 | 35,169 | (74,293)
AOCI (loss), end of year | (22,442) | (31,402) | (66,571)
Accumulated other comprehensive income (loss), tax |  |  |
AOCI (loss), beginning of year | (6,595) | (13,980) | 1,621
OCI (loss) before reclassifications | 1,377 | 5,464 | (18,692)
Realized investment losses | 340 | 1,411 | 2,951
Impairment losses | 164 | 510 | 140
Investment securities, OCI (loss) | 1,881 | 7,385 | (15,601)
AOCI (loss), end of year | (4,714) | (6,595) | (13,980)
Accumulated other comprehensive income (loss), net of tax |  |  |
AOCI (loss), beginning of year | (24,807) | (52,591) | 6,101
OCI (loss) before reclassifications | 5,180 | 20,557 | (70,318)
Realized investment losses | 1,280 | 5,308 | 11,099
Impairment losses | 619 | 1,919 | 527
Investment securities, OCI (loss) | 7,079 | 27,784 | (58,692)
AOCI (loss), end of year | (17,728) | (24,807) | (52,591)
Pension and other postretirement plans: |  |  |
Accumulated other comprehensive income (loss), before tax |  |  |
AOCI (loss), beginning of year | 14,439 | 57,186 | (39,734)
OCI (loss) before reclassifications | (45,655) | (28,862) | 88,148
Amortization of prior service costs | 1,611 | 1,446 | 1,443
Amortization of net actuarial (gain) loss | (6,859) | (15,331) | 7,329
Settlement gain | (1,338) | 0 | 0
Pension and other postretirement plans, OCI (loss) | (52,241) | (42,747) | 96,920
AOCI (loss), end of year | (37,802) | 14,439 | 57,186
Accumulated other comprehensive income (loss), tax |  |  |
AOCI (loss), beginning of year | 3,032 | 12,009 | (8,345)
OCI (loss) before reclassifications | (9,588) | (6,061) | 18,511
Amortization of prior service costs | 338 | 304 | 303
Amortization of net actuarial (gain) loss | (1,440) | (3,220) | 1,540
Settlement gain | (281) | 0 | 0
Pension and other postretirement plans, OCI (loss) | (10,971) | (8,977) | 20,354
AOCI (loss), end of year | (7,939) | 3,032 | 12,009
Accumulated other comprehensive income (loss), net of tax |  |  |
AOCI (loss), beginning of year | 11,407 | 45,177 | (31,389)
OCI (loss) before reclassifications | (36,067) | (22,801) | 69,637
Amortization of prior service costs | 1,273 | 1,142 | 1,140
Amortization of net actuarial (gain) loss | (5,419) | (12,111) | 5,789
Settlement gain | (1,057) | 0 | 0
Pension and other postretirement plans, OCI (loss) | (41,270) | (33,770) | 76,566
AOCI (loss), end of year | $ (29,863) | $ 11,407 | $ 45,177

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