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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 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 |  | $ 42,900 | $ (112,398)
Reclassification adjustment for gains included in net income, pre-tax | [1] | (120) | 0
Net unrealized holding gains (losses) |  | 42,780 | (112,398)
Change in funded status of post-retirement health plan, pre-tax |  | 0 | (2)
Net other comprehensive (loss), pre-tax |  | 42,780 | (112,400)
Unrealized holding gains (losses) on available-for-sale securities during the period, tax |  | (9,009) | 23,605
Reclassification adjustment for (gains) losses included in net income, tax | [1] | 25 | 0
Net unrealized gains on available-for-sale securities, tax |  | (8,984) | 23,605
Change in funded status of post-retirement health plan, tax |  | 0 | 0
Net other comprehensive (loss), tax |  | (8,984) | 23,605
Unrealized holding gains (losses) on available-for-sale securities during the period, after-tax |  | 33,891 | (88,793)
Reclassification adjustment for gains included in net income, after-tax | [1] | (95) | 0
Unrealized holding gains (losses), net of reclassification and tax |  | 33,796 | (88,793)
Change in funded status of post-retirement plan, net of tax |  | 0 | (2)
Other comprehensive income (loss), net of tax |  | $ 33,796 | $ (88,795)
[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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