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Accumulated Other Comprehensive Income (Loss) - AOCI Components Pre Post & Tax Effect (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Other Comprehensive Income (Loss), Before Tax: |  |  |  |
Net Unrealized Gains (Losses) Arising During the Period | $ 46,623 | $ (38,035) | $ 64,049 | $ (36,702)
Loss on Sale |  | 4,582 |  | 4,582
Amortization of Unrealized Holding Losses on HTM Securities | 6,207 | 6,787 | 18,703 | 20,500
Net Unrealized Gains (Losses) on Investment Securities | 52,830 | (26,666) | 82,752 | (11,620)
Amortization of Net Actuarial Losses | 291 | 177 | 873 | 528
Amortization of Prior Service Credit | (62) | (62) | (184) | (184)
Defined Benefit Plans, Net | 229 | 115 | 689 | 344
Other Comprehensive Income (Loss) | 53,059 | (26,551) | 83,441 | (11,276)
Other Comprehensive Income (Loss), Tax Effect: |  |  |  |
Net Unrealized Gains (Losses) Arising During the Period | 12,352 | (11,439) | 16,971 | (11,086)
Loss on Sale |  | 1,237 |  | 1,237
Amortization of Unrealized Holding Losses on HTM Securities | 1,645 | 1,800 | 4,958 | 5,434
Net Unrealized Gains on Investment Securities | 13,997 | (8,402) | 21,929 | (4,415)
Amortization of Net Actuarial Losses | 77 | 46 | 232 | 140
Amortization of Prior Service Credit | (16) | (15) | (48) | (48)
Defined Benefit Plans, Net | 61 | 31 | 184 | 92
Other Comprehensive Income (Loss) | 14,058 | (8,371) | 22,113 | (4,323)
Other Comprehensive Income (Loss), Net of Tax: |  |  |  |
Net Unrealized Gains (Losses) Arising During the Period | 34,271 | (26,596) | 47,078 | (25,616)
Loss on Sale |  | 3,345 |  | 3,345
Amortization of Unrealized Holding Losses on HTM Securities | 4,562 | 4,987 | 13,745 | 15,066
Net Unrealized Gains (Losses) on Investment Securities | 38,833 | (18,264) | 60,823 | (7,205)
Amortization of Net Actuarial Losses | 214 | 131 | 641 | 388
Amortization of Prior Service Credit | (46) | (47) | (136) | (136)
Defined Benefit Plans, Net | 168 | 84 | 505 | 252
Total Other Comprehensive Income (Loss) | $ 39,001 | $ (18,180) | $ 61,328 | $ (6,953)

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