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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.