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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)