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Shareholders' Equity - AOCI Components Pre Post & Tax Effect (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other Comprehensive Income (Loss), Before Tax: |  |  |
Net Unrealized Gains (Losses) Arising During the Period | $ 17,692 | $ (523,221) | $ (111,084)
(Gain) Loss on Sale | 4,582 |  | (3,798)
Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities | 26,909 | 10,680 | 648
Net Unrealized Gains (Losses) on Investment Securities | 49,183 | (512,541) | (114,234)
Net Actuarial Gains (Losses) Arising During the Period | 1,968 | 9,525 | 10,842
Amortization of Net Actuarial Losses (Gains) | 751 | 2,175 | 2,676
Amortization of Prior Service Credit | (246) | (246) | (246)
Defined Benefit Plans, Net | 2,473 | 11,454 | 13,272
Other Comprehensive Income (Loss) | 51,656 | (501,087) | (100,962)
Other Comprehensive Income (Loss), Tax Effect: |  |  |
Net Unrealized Gains (Losses) Arising During the Period | 4,661 | (138,678) | (29,440)
(Gain) Loss on Sale | 1,237 |  | (1,007)
Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities | 7,133 | 2,831 | 171
Net Unrealized Gains (Losses) on Investment Securities | 13,031 | (135,847) | (30,276)
Net Actuarial Gains (Losses) Arising During the Period | 521 | 2,525 | 2,874
Amortization of Net Actuarial Losses (Gains) | 199 | 576 | 709
Amortization of Prior Service Credit | (65) | (65) | (65)
Defined Benefit Plans, Net | 655 | 3,036 | 3,518
Other Comprehensive Income (Loss) | 13,686 | (132,811) | (26,758)
Other Comprehensive Income (Loss), Net of Tax: |  |  |
Net Unrealized Gains (Losses) Arising During the Period | 13,031 | (384,543) | (81,644)
(Gain) Loss on Sale | 3,345 |  | (2,791)
Amortization of Unrealized Holding (Gains) Losses on Held-to-Maturity Securities | 19,776 | 7,849 | 477
Net Unrealized Gains (Losses) on Investment Securities | 36,152 | (376,694) | (83,958)
Net Actuarial Gains (Losses) Arising During the Period | 1,447 | 7,000 | 7,968
Amortization of Net Actuarial Losses (Gains) | 552 | 1,599 | 1,967
Amortization of Prior Service Credit | (181) | (181) | (181)
Defined Benefit Plans, Net | 1,818 | 8,418 | 9,754
Other Comprehensive Income (Loss) | $ 37,970 | $ (368,276) | $ (74,204)

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