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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Accumulated other comprehensive income (loss), before tax |  |  |  |  |  |
Investment securities, OCI (loss) | $ 7,926 |  | $ 1,951 |  | $ 15,240 | $ 997
Pension and other postretirement plans, OCI (loss) | (233) |  | (4,347) |  | (942) | (5,709)
OCI (loss) | 7,693 |  | (2,396) |  | 14,298 | (4,712)
Accumulated other comprehensive income (loss), tax |  |  |  |  |  |
Investment securities, OCI (loss) | 1,665 |  | 410 |  | 3,201 | 210
Pension and other postretirement plans, OCI (loss) | (50) |  | (913) |  | (198) | (1,199)
OCI (loss) | 1,615 |  | (503) |  | 3,003 | (989)
Accumulated other comprehensive income (loss), net of tax |  |  |  |  |  |
Net of tax, beginning balance | 2,067,351 | $ 1,987,258 | 1,726,180 | $ 1,662,835 | 1,987,258 | 1,662,835
Investment securities, OCI (loss) | 6,261 |  | 1,541 |  | 12,039 | 787
Pension and other postretirement plans, OCI (loss) | (183) |  | (3,434) |  | (744) | (4,510)
OCI (loss) | 6,078 | 5,217 | (1,893) | (1,830) | 11,295 | (3,723)
Net of tax, ending balance | 2,184,545 | 2,067,351 | 1,828,813 | 1,726,180 | 2,184,545 | 1,828,813
Total |  |  |  |  |  |
Accumulated other comprehensive income (loss), before tax |  |  |  |  |  |
Before tax, beginning balance | (53,639) | (60,244) | (19,279) | (16,963) | (60,244) | (16,963)
Before tax, ending balance | (45,946) | (53,639) | (21,675) | (19,279) | (45,946) | (21,675)
Accumulated other comprehensive income (loss), tax |  |  |  |  |  |
Income Tax, beginning balance | (11,265) | (12,653) | (4,049) | (3,563) | (12,653) | (3,563)
Income Tax, ending balance | (9,650) | (11,265) | (4,552) | (4,049) | (9,650) | (4,552)
Accumulated other comprehensive income (loss), net of tax |  |  |  |  |  |
Net of tax, beginning balance | (42,374) | (47,591) | (15,230) | (13,400) | (47,591) | (13,400)
OCI (loss) | 6,078 | 5,217 | (1,893) | (1,830) |  |
Net of tax, ending balance | (36,296) | (42,374) | (17,123) | (15,230) | (36,296) | (17,123)
Investment securities: |  |  |  |  |  |
Accumulated other comprehensive income (loss), before tax |  |  |  |  |  |
Before tax, beginning balance | (15,128) | (22,442) | (32,356) | (31,402) | (22,442) | (31,402)
OCI (loss) before reclassifications | 6,774 |  | (627) |  | 13,461 | (2,181)
Realized investment losses | 431 |  | 2,375 |  | 693 | 2,637
Impairment losses | 721 |  | 203 |  | 1,086 | 541
Investment securities, OCI (loss) | 7,926 |  | 1,951 |  | 15,240 | 997
Before tax, ending balance | (7,202) | (15,128) | (30,405) | (32,356) | (7,202) | (30,405)
Accumulated other comprehensive income (loss), tax |  |  |  |  |  |
Income Tax, beginning balance | (3,178) | (4,714) | (6,795) | (6,595) | (4,714) | (6,595)
OCI (loss) before reclassifications | 1,423 |  | (132) |  | 2,827 | (458)
Realized investment losses | 91 |  | 499 |  | 146 | 554
Impairment losses | 151 |  | 43 |  | 228 | 114
Investment securities, OCI (loss) | 1,665 |  | 410 |  | 3,201 | 210
Income Tax, ending balance | (1,513) | (3,178) | (6,385) | (6,795) | (1,513) | (6,385)
Accumulated other comprehensive income (loss), net of tax |  |  |  |  |  |
Net of tax, beginning balance | (11,950) | (17,728) | (25,561) | (24,807) | (17,728) | (24,807)
OCI (loss) before reclassifications | 5,351 |  | (495) |  | 10,634 | (1,723)
Realized investment losses | 340 |  | 1,876 |  | 547 | 2,083
Impairment losses | 570 |  | 160 |  | 858 | 427
Net of tax, ending balance | (5,689) | (11,950) | (24,020) | (25,561) | (5,689) | (24,020)
Pension and other postretirement plans: |  |  |  |  |  |
Accumulated other comprehensive income (loss), before tax |  |  |  |  |  |
Before tax, beginning balance | (38,511) | (37,802) | 13,077 | 14,439 | (37,802) | 14,439
OCI (loss) before reclassifications | 0 |  | (1,731) |  | 0 | (1,731)
Amortization of prior service costs | 422 |  | 397 |  | 844 | 786
Amortization of net actuarial gain | (655) |  | (1,734) |  | (1,309) | (3,485)
Settlement gain | 0 |  | (1,279) |  | (477) | (1,279)
Pension and other postretirement plans, OCI (loss) | (233) |  | (4,347) |  | (942) | (5,709)
Before tax, ending balance | (38,744) | (38,511) | 8,730 | 13,077 | (38,744) | 8,730
Accumulated other comprehensive income (loss), tax |  |  |  |  |  |
Income Tax, beginning balance | (8,087) | (7,939) | 2,746 | 3,032 | (7,939) | 3,032
OCI (loss) before reclassifications | 0 |  | (364) |  | 0 | (364)
Amortization of prior service costs | 88 |  | 83 |  | 177 | 165
Amortization of net actuarial gain | (138) |  | (364) |  | (275) | (732)
Settlement gain | 0 |  | (268) |  | (100) | (268)
Pension and other postretirement plans, OCI (loss) | (50) |  | (913) |  | (198) | (1,199)
Income Tax, ending balance | (8,137) | (8,087) | 1,833 | 2,746 | (8,137) | 1,833
Accumulated other comprehensive income (loss), net of tax |  |  |  |  |  |
Net of tax, beginning balance | (30,424) | (29,863) | 10,331 | 11,407 | (29,863) | 11,407
OCI (loss) before reclassifications | 0 |  | (1,367) |  | 0 | (1,367)
Amortization of prior service costs | 334 |  | 314 |  | 667 | 621
Amortization of net actuarial gain | (517) |  | (1,370) |  | (1,034) | (2,753)
Settlement gain | 0 |  | (1,011) |  | (377) | (1,011)
Pension and other postretirement plans, OCI (loss) | (183) |  | (3,434) |  | (744) | (4,510)
Net of tax, ending balance | $ (30,607) | $ (30,424) | $ 6,897 | $ 10,331 | $ (30,607) | $ 6,897

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