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Accumulated Other Comprehensive Income (Loss) - AOCI Components Pre Post & Tax Effect (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Other Comprehensive Income (Loss), Before Tax: |  |  |  |  |  |
Net Unrealized Gains (Losses) Arising During the Period | $ 6,022 |  | $ (31,586) |  | $ 17,426 | $ 1,332
Amortization of Unrealized Holding (Gains) Losses on HTM Securities | 6,294 |  | 6,801 |  | 12,496 | 13,714
Net Unrealized Gains (Losses) on Investment Securities | 12,316 |  | (24,785) |  | 29,922 | 15,046
Amortization of Net Actuarial Losses (Gains) | 291 |  | 177 |  | 582 | 352
Amortization of Prior Service Credit | (61) |  | (62) |  | (122) | (123)
Defined Benefit Plans, Net | 230 |  | 115 |  | 460 | 229
Other Comprehensive Income (Loss) | 12,546 |  | (24,670) |  | 30,382 | 15,275
Other Comprehensive Income (Loss), Tax Effect: |  |  |  |  |  |
Net Unrealized Gains (Losses) Arising During the Period | 1,595 |  | (8,371) |  | 4,619 | 352
Amortization of Unrealized Holding (Gains) Losses on HTM Securities | 1,669 |  | 1,803 |  | 3,313 | 3,635
Net Unrealized Gains (Losses) on Investment Securities | 3,264 |  | (6,568) |  | 7,932 | 3,987
Amortization of Net Actuarial Losses (Gains) | 78 |  | 46 |  | 155 | 93
Amortization of Prior Service Credit | (16) |  | (15) |  | (32) | (32)
Defined Benefit Plans, Net | 62 |  | 31 |  | 123 | 61
Other Comprehensive Income (Loss) | 3,326 |  | (6,537) |  | 8,055 | 4,048
Other Comprehensive Income (Loss), Net of Tax: |  |  |  |  |  |
Net Unrealized Gains (Losses) Arising During the Period | 4,427 |  | (23,215) |  | 12,807 | 980
Amortization of Unrealized Holding (Gains) Losses on HTM Securities | 4,625 |  | 4,998 |  | 9,183 | 10,079
Net Unrealized Gains (Losses) on Investment Securities | 9,052 |  | (18,217) |  | 21,990 | 11,059
Amortization of Net Actuarial Losses (Gains) | 213 |  | 131 |  | 427 | 259
Amortization of Prior Service Credit | (45) |  | (47) |  | (90) | (91)
Defined Benefit Plans, Net | 168 |  | 84 |  | 337 | 168
Total Other Comprehensive Income (Loss) | $ 9,220 | $ 13,107 | $ (18,133) | $ 29,360 | $ 22,327 | $ 11,227

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