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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |  |  |  |  |  |
Unrealized holding gains (losses) on available-for-sale securities during the period, pre-tax |  | $ (21,309) |  | $ (105,497) |  | $ 21,591 | $ (217,894)
Reclassification adjustment for gains (losses) included in net income, pre-tax | [1] | 0 |  | 31 |  | (120) | 31
Net unrealized holding (losses) gains |  | (21,309) |  | (105,466) |  | 21,471 | (217,863)
Change in funded status of post-retirement health plan, pre-tax |  |  |  | (2) |  |  | (3)
Net other comprehensive income (loss), pre-tax |  | (21,309) |  | (105,468) |  | 21,471 | (217,866)
Unrealized holding gains (losses) on available-for-sale securities during the period, tax |  | 4,475 |  | 22,154 |  | (4,534) | 45,758
Reclassification adjustment for gains (losses) included in net income, tax | [1] | 0 |  | (6) |  | 25 | (7)
Net unrealized gains on available-for-sale securities, tax |  | 4,475 |  | 22,148 |  | (4,509) | 45,751
Change in funded status of post-retirement health plan, tax |  |  |  | 0 |  |  | 0
Net other comprehensive income (loss), tax |  | 4,475 |  | 22,148 |  | (4,509) | 45,751
Unrealized holding gains (losses) on available-for-sale securities during the period, after-tax |  | (16,834) |  | (83,343) |  | 17,057 | (172,136)
Reclassification adjustment for gains (losses) included in net income, after-tax | [1] | 0 |  | 25 |  | (95) | 24
Unrealized holding (losses) gains, net of reclassification and tax |  | (16,834) |  | (83,318) |  | 16,962 | (172,112)
Change in funded status of post-retirement plan, net of tax |  | 0 |  | (2) |  | 0 | (3)
Other comprehensive (loss) income, net of tax |  | $ (16,834) | $ 33,796 | $ (83,320) | $ (88,795) | $ 16,962 | $ (172,115)
[1] | Pre-tax reclassification adjustments relating to available-for-sale securities are reported in security gains and the tax impact is included in income tax expense on the consolidated statements of income.

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