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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component, Including Amounts Reclassified to Other Comprehensive Income (Loss) and the Related Line item in the Statements of Operations Where Net Income is Presented | Changes in accumulated other comprehensive income ("AOCI") (loss) by component, including amounts reclassified to other comprehensive income ("OCI") (loss) and the related line item in the Consolidated Statements of Operations where net income is presented, are as follows for the year ended December 31:
(in thousands) |  | 2024 |  | 2023 |  | 2022
|  | Before Tax | Income Tax | Net |  | Before Tax | Income Tax | Net |  | Before Tax | Income Tax | Net
Investment securities: |  |  |  |  |  |  |  |  |  |  |  |
AOCI (loss), beginning of year |  | $ | (31,402) |  | $ | (6,595) |  | $ | (24,807) |  |  | $ | (66,571) |  | $ | (13,980) |  | $ | (52,591) |  |  | $ | 7,722 |  | $ | 1,621 |  | $ | 6,101 |
OCI (loss) before reclassifications |  | 6,557 |  | 1,377 |  | 5,180 |  |  | 26,021 |  | 5,464 |  | 20,557 |  |  | (89,010) |  | (18,692) |  | (70,318) |
Realized investment losses |  | 1,620 |  | 340 |  | 1,280 |  |  | 6,719 |  | 1,411 |  | 5,308 |  |  | 14,050 |  | 2,951 |  | 11,099 |
Impairment losses |  | 783 |  | 164 |  | 619 |  |  | 2,429 |  | 510 |  | 1,919 |  |  | 667 |  | 140 |  | 527 |
OCI (loss) |  | 8,960 |  | 1,881 |  | 7,079 |  |  | 35,169 |  | 7,385 |  | 27,784 |  |  | (74,293) |  | (15,601) |  | (58,692) |
AOCI (loss), end of year |  | $ | (22,442) |  | $ | (4,714) |  | $ | (17,728) |  |  | $ | (31,402) |  | $ | (6,595) |  | $ | (24,807) |  |  | $ | (66,571) |  | $ | (13,980) |  | $ | (52,591) |
Pension and other postretirement plans: |  |  |  |  |  |  |  |
AOCI (loss), beginning of year |  | $ | 14,439 |  | $ | 3,032 |  | $ | 11,407 |  |  | $ | 57,186 |  | $ | 12,009 |  | $ | 45,177 |  |  | $ | (39,734) |  | $ | (8,345) |  | $ | (31,389) |
OCI (loss) before reclassifications |  | (45,655) |  | (9,588) |  | (36,067) |  |  | (28,862) |  | (6,061) |  | (22,801) |  |  | 88,148 |  | 18,511 |  | 69,637 |
Amortization of prior service costs (1) |  | 1,611 |  | 338 |  | 1,273 |  |  | 1,446 |  | 304 |  | 1,142 |  |  | 1,443 |  | 303 |  | 1,140 |
Amortization of net actuarial (gain) loss (1) |  | (6,859) |  | (1,440) |  | (5,419) |  |  | (15,331) |  | (3,220) |  | (12,111) |  |  | 7,329 |  | 1,540 |  | 5,789 |
Settlement gain (1) |  | (1,338) |  | (281) |  | (1,057) |  |  | — |  | — |  | — |  |  | — |  | — |  | — |
OCI (loss) |  | (52,241) |  | (10,971) |  | (41,270) |  |  | (42,747) |  | (8,977) |  | (33,770) |  |  | 96,920 |  | 20,354 |  | 76,566 |
AOCI (loss), end of year |  | $ | (37,802) |  | $ | (7,939) |  | $ | (29,863) |  |  | $ | 14,439 |  | $ | 3,032 |  | $ | 11,407 |  |  | $ | 57,186 |  | $ | 12,009 |  | $ | 45,177 |
Total |  |  |  |  |  |  |  |  |  |  |  |
AOCI (loss), beginning of year |  | $ | (16,963) |  | $ | (3,563) |  | $ | (13,400) |  |  | $ | (9,385) |  | $ | (1,971) |  | $ | (7,414) |  |  | $ | (32,012) |  | $ | (6,724) |  | $ | (25,288) |
Investment securities |  | 8,960 |  | 1,881 |  | 7,079 |  |  | 35,169 |  | 7,385 |  | 27,784 |  |  | (74,293) |  | (15,601) |  | (58,692) |
Pension and other postretirement plans |  | (52,241) |  | (10,971) |  | (41,270) |  |  | (42,747) |  | (8,977) |  | (33,770) |  |  | 96,920 |  | 20,354 |  | 76,566 |
OCI (loss) |  | (43,281) |  | (9,090) |  | (34,191) |  |  | (7,578) |  | (1,592) |  | (5,986) |  |  | 22,627 |  | 4,753 |  | 17,874 |
AOCI (loss), end of year |  | $ | (60,244) |  | $ | (12,653) |  | $ | (47,591) |  |  | $ | (16,963) |  | $ | (3,563) |  | $ | (13,400) |  |  | $ | (9,385) |  | $ | (1,971) |  | $ | (7,414) |
(1)These components of AOCI (loss) are included in the computation of net periodic pension (income) cost. See Note 10, "Postretirement Benefits", for additional information.

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