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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Accumulated other comprehensive income (loss), before tax |  |
Investment securities, OCI (loss) | $ 7,314 | $ (954)
Pension and other postretirement plans, OCI (loss) | (709) | (1,362)
OCI (loss) | 6,605 | (2,316)
Accumulated other comprehensive income (loss), tax |  |
Investment securities, OCI (loss) | 1,536 | (200)
Pension and other postretirement plans, OCI (loss) | (148) | (286)
OCI (loss) | 1,388 | (486)
Accumulated other comprehensive income (loss), net of tax |  |
Net of tax, beginning balance | 1,987,258 | 1,662,835
Investment securities, OCI (loss) | 5,778 | (754)
Pension and other postretirement plans, OCI (loss) | (561) | (1,076)
OCI (loss) | 5,217 | (1,830)
Net of tax, ending balance | 2,067,351 | 1,726,180
Total |  |
Accumulated other comprehensive income (loss), before tax |  |
Before tax, beginning balance | (60,244) | (16,963)
Before tax, ending balance | (53,639) | (19,279)
Accumulated other comprehensive income (loss), tax |  |
Tax, beginning balance | 12,653 | 3,563
Tax, ending balance | 11,265 | 4,049
Accumulated other comprehensive income (loss), net of tax |  |
Net of tax, beginning balance | (47,591) | (13,400)
OCI (loss) | 5,217 | (1,830)
Net of tax, ending balance | (42,374) | (15,230)
Investment securities: |  |
Accumulated other comprehensive income (loss), before tax |  |
Before tax, beginning balance | (22,442) | (31,402)
OCI (loss) before reclassifications | 6,687 | (1,554)
Realized investment losses | 262 | 262
Impairment losses | 365 | 338
Investment securities, OCI (loss) | 7,314 | (954)
Before tax, ending balance | (15,128) | (32,356)
Accumulated other comprehensive income (loss), tax |  |
Tax, beginning balance | 4,714 | 6,595
OCI (loss) before reclassifications | 1,404 | (326)
Realized investment losses | 55 | 55
Impairment losses | 77 | 71
Investment securities, OCI (loss) | 1,536 | (200)
Tax, ending balance | 3,178 | 6,795
Accumulated other comprehensive income (loss), net of tax |  |
Net of tax, beginning balance | (17,728) | (24,807)
OCI (loss) before reclassifications | 5,283 | (1,228)
Realized investment losses | 207 | 207
Impairment losses | 288 | 267
Investment securities, OCI (loss) | 5,778 | (754)
Net of tax, ending balance | (11,950) | (25,561)
Pension and other postretirement plans: |  |
Accumulated other comprehensive income (loss), before tax |  |
Before tax, beginning balance | (37,802) | 14,439
Amortization of prior service costs | 422 | 389
Amortization of net actuarial gain | (654) | (1,751)
Settlement gain | (477) | 0
Pension and other postretirement plans, OCI (loss) | (709) | (1,362)
Before tax, ending balance | (38,511) | 13,077
Accumulated other comprehensive income (loss), tax |  |
Tax, beginning balance | 7,939 | (3,032)
Amortization of prior service costs | 89 | 82
Amortization of net actuarial gain | (137) | (368)
Settlement gain | (100) | 0
Pension and other postretirement plans, OCI (loss) | (148) | (286)
Tax, ending balance | 8,087 | (2,746)
Accumulated other comprehensive income (loss), net of tax |  |
Net of tax, beginning balance | (29,863) | 11,407
Amortization of prior service costs | 333 | 307
Amortization of net actuarial gain | (517) | (1,383)
Settlement gain | (377) | 0
Pension and other postretirement plans, OCI (loss) | (561) | (1,076)
Net of tax, ending balance | $ (30,424) | $ 10,331

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