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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Comprehensive Income Net Of Tax [Abstract] |  |  |
Unrealized holding losses on available-for-sale securities during the period |  | $ (112,398) | $ (14,934)
Reclassification adjustment for (gains) losses included in net income, pre-tax | [1] | 0 | (383)
Net unrealized holding losses |  | (112,398) | (15,317)
Change in funded status of post-retirement health plan, pre-tax |  | (2) |
Net other comprehensive income (loss), pre-tax |  | (112,400) | (15,317)
Unrealized holding losses on available-for-sale securities during the period |  | 23,605 | 3,136
Tax provision related to net realized gain | [1] | 0 | 81
Net unrealized losses on available-for-sale securities |  | 23,605 | 3,217
Change in funded status of post-retirement health plan, tax |  | 0 |
Net other comprehensive income (loss), tax |  | 23,605 | 3,217
Unrealized holding losses on available-for-sale securities during the period |  | (88,793) | (11,798)
Reclassification adjustment for (gains) losses included in net income, after-tax | [1] | 0 | (302)
Unrealized holding losses, net of reclassification and tax |  | (88,793) | (12,100)
Change in funded status of post-retirement plan, net of tax |  | (2) | 0
Other comprehensive loss, net of tax |  | $ (88,795) | $ (12,100)
[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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