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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accumulated other comprehensive income (loss), before tax |  |  |  |  |  |  |  |
Investment securities, OCI (loss) | $ 7,727 |  |  | $ 25,603 |  |  | $ 22,967 | $ 26,600
Pension and other postretirement plans, OCI (loss) | (1,336) |  |  | (1,947) |  |  | (2,278) | (7,656)
OCI (loss) | 6,391 |  |  | 23,656 |  |  | 20,689 | 18,944
Accumulated other comprehensive income (loss), tax |  |  |  |  |  |  |  |
Investment securities, OCI (loss) | 1,622 |  |  | 5,376 |  |  | 4,823 | 5,586
Pension and other postretirement plans, OCI (loss) | (280) |  |  | (409) |  |  | (478) | (1,608)
OCI | 1,342 |  |  | 4,967 |  |  | 4,345 | 3,978
Accumulated other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |
Net of tax, beginning balance | 2,184,545 | $ 2,067,351 | $ 1,987,258 | 1,828,813 | $ 1,726,180 | $ 1,662,835 | 1,987,258 | 1,662,835
Investment securities, OCI (loss) | 6,105 |  |  | 20,227 |  |  | 18,144 | 21,014
Pension and other postretirement plans, OCI (loss) | (1,056) |  |  | (1,538) |  |  | (1,800) | (6,048)
OCI | 5,049 | 6,078 | 5,217 | 18,689 | (1,893) | (1,830) | 16,344 | 14,966
Net of tax, ending balance | 2,308,878 | 2,184,545 | 2,067,351 | 1,947,955 | 1,828,813 | 1,726,180 | 2,308,878 | 1,947,955
Total |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss), before tax |  |  |  |  |  |  |  |
Before tax, beginning balance | (45,946) |  | (60,244) | (21,675) |  | (16,963) | (60,244) | (16,963)
Before tax, ending balance | (39,555) | (45,946) |  | 1,981 | (21,675) |  | (39,555) | 1,981
Accumulated other comprehensive income (loss), tax |  |  |  |  |  |  |  |
Income Tax, beginning balance | (9,650) |  | (12,653) | (4,552) |  | (3,563) | (12,653) | (3,563)
Income Tax, ending balance | (8,308) | (9,650) |  | 415 | (4,552) |  | (8,308) | 415
Accumulated other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |
Net of tax, beginning balance | (36,296) | (42,374) | (47,591) | (17,123) | (15,230) | (13,400) | (47,591) | (13,400)
OCI | 5,049 | 6,078 | 5,217 | 18,689 | (1,893) | (1,830) |  |
Net of tax, ending balance | (31,247) | (36,296) | (42,374) | 1,566 | (17,123) | (15,230) | (31,247) | 1,566
Investment securities: |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss), before tax |  |  |  |  |  |  |  |
Before tax, beginning balance | (7,202) |  | (22,442) | (30,405) |  | (31,402) | (22,442) | (31,402)
OCI before reclassifications | 7,803 |  |  | 25,586 |  |  | 21,264 | 23,405
Realized investment gains (losses) | (571) |  |  | (142) |  |  | 122 | 2,495
Impairment losses | 495 |  |  | 159 |  |  | 1,581 | 700
Investment securities, OCI (loss) | 7,727 |  |  | 25,603 |  |  | 22,967 | 26,600
Before tax, ending balance | 525 | (7,202) |  | (4,802) | (30,405) |  | 525 | (4,802)
Accumulated other comprehensive income (loss), tax |  |  |  |  |  |  |  |
Income Tax, beginning balance | (1,513) |  | (4,714) | (6,385) |  | (6,595) | (4,714) | (6,595)
OCI before reclassifications | 1,638 |  |  | 5,373 |  |  | 4,465 | 4,915
Realized investment gains (losses) | (120) |  |  | (30) |  |  | 26 | 524
Impairment losses | 104 |  |  | 33 |  |  | 332 | 147
Investment securities, OCI (loss) | 1,622 |  |  | 5,376 |  |  | 4,823 | 5,586
Income Tax, ending balance | 109 | (1,513) |  | (1,009) | (6,385) |  | 109 | (1,009)
Accumulated other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |
Net of tax, beginning balance | (5,689) |  | (17,728) | (24,020) |  | (24,807) | (17,728) | (24,807)
OCI before reclassifications | 6,165 |  |  | 20,213 |  |  | 16,799 | 18,490
Realized investment gains (losses) | (451) |  |  | (112) |  |  | 96 | 1,971
Impairment losses | 391 |  |  | 126 |  |  | 1,249 | 553
Net of tax, ending balance | 416 | (5,689) |  | (3,793) | (24,020) |  | 416 | (3,793)
Pension and other postretirement plans: |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss), before tax |  |  |  |  |  |  |  |
Before tax, beginning balance | (38,744) |  | (37,802) | 8,730 |  | 14,439 | (37,802) | 14,439
OCI (loss) before reclassifications | (1,063) |  |  | (606) |  |  | (1,063) | (2,337)
Amortization of prior service costs | 422 |  |  | 413 |  |  | 1,266 | 1,199
Amortization of net actuarial gain | (633) |  |  | (1,695) |  |  | (1,942) | (5,180)
Settlement gain | (62) |  |  | (59) |  |  | (539) | (1,338)
Pension and other postretirement plans, OCI (loss) | (1,336) |  |  | (1,947) |  |  | (2,278) | (7,656)
Before tax, ending balance | (40,080) | (38,744) |  | 6,783 | 8,730 |  | (40,080) | 6,783
Accumulated other comprehensive income (loss), tax |  |  |  |  |  |  |  |
Income Tax, beginning balance | (8,137) |  | (7,939) | 1,833 |  | 3,032 | (7,939) | 3,032
OCI (loss) before reclassifications | (223) |  |  | (127) |  |  | (223) | (491)
Amortization of prior service costs | 89 |  |  | 87 |  |  | 266 | 252
Amortization of net actuarial gain | (133) |  |  | (356) |  |  | (408) | (1,088)
Settlement gain | (13) |  |  | (13) |  |  | (113) | (281)
Pension and other postretirement plans, OCI (loss) | (280) |  |  | (409) |  |  | (478) | (1,608)
Income Tax, ending balance | (8,417) | (8,137) |  | 1,424 | 1,833 |  | (8,417) | 1,424
Accumulated other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |
Net of tax, beginning balance | (30,607) |  | $ (29,863) | 6,897 |  | $ 11,407 | (29,863) | 11,407
OCI (loss) before reclassifications | (840) |  |  | (479) |  |  | (840) | (1,846)
Amortization of prior service costs | 333 |  |  | 326 |  |  | 1,000 | 947
Amortization of net actuarial gain | (500) |  |  | (1,339) |  |  | (1,534) | (4,092)
Settlement gain | (49) |  |  | (46) |  |  | (426) | (1,057)
Pension and other postretirement plans, OCI (loss) | (1,056) |  |  | (1,538) |  |  | (1,800) | (6,048)
Net of tax, ending balance | $ (31,663) | $ (30,607) |  | $ 5,359 | $ 6,897 |  | $ (31,663) | $ 5,359

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