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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2025
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 Consolidated 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:
|  | Three months ended |  | Three months ended
|  | June 30, 2025 |  | June 30, 2024
(in thousands) |  | Before Tax | Income Tax | Net |  | Before Tax | Income Tax | Net
Investment securities: |  |  |  |  |  |  |  |
AOCI (loss), beginning of period |  | $ | (15,128) |  | $ | (3,178) |  | $ | (11,950) |  |  | $ | (32,356) |  | $ | (6,795) |  | $ | (25,561) |
OCI (loss) before reclassifications |  | 6,774 |  | 1,423 |  | 5,351 |  |  | (627) |  | (132) |  | (495) |
Realized investment losses |  | 431 |  | 91 |  | 340 |  |  | 2,375 |  | 499 |  | 1,876 |
Impairment losses |  | 721 |  | 151 |  | 570 |  |  | 203 |  | 43 |  | 160 |
OCI |  | 7,926 |  | 1,665 |  | 6,261 |  |  | 1,951 |  | 410 |  | 1,541 |
AOCI (loss), end of period |  | $ | (7,202) |  | $ | (1,513) |  | $ | (5,689) |  |  | $ | (30,405) |  | $ | (6,385) |  | $ | (24,020) |
Pension and other postretirement plans: |  |  |  |  |  |  |  |
AOCI (loss), beginning of period |  | $ | (38,511) |  | $ | (8,087) |  | $ | (30,424) |  |  | $ | 13,077 |  | $ | 2,746 |  | $ | 10,331 |
OCI (loss) before reclassifications |  | — |  | — |  | — |  |  | (1,731) |  | (364) |  | (1,367) |
Amortization of prior service costs |  | 422 |  | 88 |  | 334 |  |  | 397 |  | 83 |  | 314 |
Amortization of net actuarial gain |  | (655) |  | (138) |  | (517) |  |  | (1,734) |  | (364) |  | (1,370) |
Settlement gain |  | — |  | — |  | — |  |  | (1,279) |  | (268) |  | (1,011) |
OCI (loss) |  | (233) |  | (50) |  | (183) |  |  | (4,347) |  | (913) |  | (3,434) |
AOCI (loss), end of period |  | $ | (38,744) |  | $ | (8,137) |  | $ | (30,607) |  |  | $ | 8,730 |  | $ | 1,833 |  | $ | 6,897 |
Total |  |  |  |  |  |  |  |
AOCI (loss), beginning of period |  | $ | (53,639) |  | $ | (11,265) |  | $ | (42,374) |  |  | $ | (19,279) |  | $ | (4,049) |  | $ | (15,230) |
Investment securities |  | 7,926 |  | 1,665 |  | 6,261 |  |  | 1,951 |  | 410 |  | 1,541 |
Pension and other postretirement plans |  | (233) |  | (50) |  | (183) |  |  | (4,347) |  | (913) |  | (3,434) |
OCI (loss) |  | 7,693 |  | 1,615 |  | 6,078 |  |  | (2,396) |  | (503) |  | (1,893) |
AOCI (loss), end of period |  | $ | (45,946) |  | $ | (9,650) |  | $ | (36,296) |  |  | $ | (21,675) |  | $ | (4,552) |  | $ | (17,123) |
|  | Six months ended |  | Six months ended
|  | June 30, 2025 |  | June 30, 2024
(in thousands) |  | Before Tax | Income Tax | Net |  | Before Tax | Income Tax | Net
Investment securities: |  |  |  |  |  |  |  |
AOCI (loss), beginning of period |  | $ | (22,442) |  | $ | (4,714) |  | $ | (17,728) |  |  | $ | (31,402) |  | $ | (6,595) |  | $ | (24,807) |
OCI (loss) before reclassifications |  | 13,461 |  | 2,827 |  | 10,634 |  |  | (2,181) |  | (458) |  | (1,723) |
Realized investment losses |  | 693 |  | 146 |  | 547 |  |  | 2,637 |  | 554 |  | 2,083 |
Impairment losses |  | 1,086 |  | 228 |  | 858 |  |  | 541 |  | 114 |  | 427 |
OCI |  | 15,240 |  | 3,201 |  | 12,039 |  |  | 997 |  | 210 |  | 787 |
AOCI (loss), end of period |  | $ | (7,202) |  | $ | (1,513) |  | $ | (5,689) |  |  | $ | (30,405) |  | $ | (6,385) |  | $ | (24,020) |
Pension and other postretirement plans: |  |  |  |  |  |  |  |
AOCI (loss), beginning of period |  | $ | (37,802) |  | $ | (7,939) |  | $ | (29,863) |  |  | $ | 14,439 |  | $ | 3,032 |  | $ | 11,407 |
OCI (loss) before reclassifications |  | — |  | — |  | — |  |  | (1,731) |  | (364) |  | (1,367) |
Amortization of prior service costs |  | 844 |  | 177 |  | 667 |  |  | 786 |  | 165 |  | 621 |
Amortization of net actuarial gain |  | (1,309) |  | (275) |  | (1,034) |  |  | (3,485) |  | (732) |  | (2,753) |
Settlement gain |  | (477) |  | (100) |  | (377) |  |  | (1,279) |  | (268) |  | (1,011) |
OCI (loss) |  | (942) |  | (198) |  | (744) |  |  | (5,709) |  | (1,199) |  | (4,510) |
AOCI (loss), end of period |  | $ | (38,744) |  | $ | (8,137) |  | $ | (30,607) |  |  | $ | 8,730 |  | $ | 1,833 |  | $ | 6,897 |
Total |  |  |  |  |  |  |  |
AOCI (loss), beginning of period |  | $ | (60,244) |  | $ | (12,653) |  | $ | (47,591) |  |  | $ | (16,963) |  | $ | (3,563) |  | $ | (13,400) |
Investment securities |  | 15,240 |  | 3,201 |  | 12,039 |  |  | 997 |  | 210 |  | 787 |
Pension and other postretirement plans |  | (942) |  | (198) |  | (744) |  |  | (5,709) |  | (1,199) |  | (4,510) |
OCI (loss) |  | 14,298 |  | 3,003 |  | 11,295 |  |  | (4,712) |  | (989) |  | (3,723) |
AOCI (loss), end of period |  | $ | (45,946) |  | $ | (9,650) |  | $ | (36,296) |  |  | $ | (21,675) |  | $ | (4,552) |  | $ | (17,123) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
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