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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |  |  |  |  |  |
Unrealized holding gains (losses) on available-for-sale securities during the period |  | $ (105,497) |  | $ 8,698 |  | $ (217,894) | $ (6,236)
Reclassification adjustment for (gains) losses included in net income, pre-tax | [1] | 31 |  | (1) |  | 31 | (384)
Net unrealized holding (losses) gains |  | (105,466) |  | 8,697 |  | (217,863) | (6,620)
Change in funded status of post-retirement health plan, pre-tax |  | (2) |  |  |  | (3) |
Net other comprehensive income (loss), pre-tax |  | (105,468) |  | 8,697 |  | (217,866) | (6,620)
Unrealized holding gains (losses) on available-for-sale securities during the period |  | 22,154 |  | (1,825) |  | 45,758 | 1,311
Tax provision related to net realized gain | [1] | (6) |  | 0 |  | (7) | 81
Net unrealized losses on available-for-sale securities |  | 22,148 |  | (1,825) |  | 45,751 | 1,392
Change in funded status of post-retirement health plan, tax |  | 0 |  |  |  | 0 |
Net other comprehensive income (loss), tax |  | 22,148 |  | (1,825) |  | 45,751 | 1,392
Unrealized holding gains (losses) on available-for-sale securities during the period |  | (83,343) |  | 6,873 |  | (172,136) | (4,925)
Reclassification adjustment for (gains) losses included in net income, after-tax | [1] | 25 |  | (1) |  | 24 | (303)
Unrealized holding (losses) gains, net of reclassification and tax |  | (83,318) |  | 6,872 |  | (172,112) | (5,228)
Change in funded status of post-retirement plan, net of tax |  | (2) |  | 0 |  | (3) | 0
Other comprehensive (loss) gain, net of tax |  | $ (83,320) | $ (88,795) | $ 6,872 | $ (12,100) | $ (172,115) | $ (5,228)
[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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