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Accumulated Other Comprehensive Income (Loss) - AOCI Components Pre Post & Tax Effect (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Other Comprehensive Income (Loss), Before Tax: |  |
Net Unrealized Gains (Losses) Arising During the Period | $ 11,404 | $ 32,918
Amortization of Unrealized Holding (Gains) Losses on HTM Securities | 6,202 | 6,913
Net Unrealized Gains (Losses) on Investment Securities | 17,606 | 39,831
Amortization of Net Actuarial Losses (Gains) | 291 | 175
Amortization of Prior Service Credit | (61) | (61)
Defined Benefit Plans, Net | 230 | 114
Other Comprehensive Income (Loss) | 17,836 | 39,945
Other Comprehensive Income (Loss), Tax Effect: |  |
Net Unrealized Gains (Losses) Arising During the Period | 3,024 | 8,723
Amortization of Unrealized Holding (Gains) Losses on HTM Securities | 1,644 | 1,832
Net Unrealized Gains (Losses) on Investment Securities | 4,668 | 10,555
Amortization of Net Actuarial Losses (Gains) | 77 | 47
Amortization of Prior Service Credit | (16) | (17)
Defined Benefit Plans, Net | 61 | 30
Other Comprehensive Income (Loss) | 4,729 | 10,585
Other Comprehensive Income (Loss), Net of Tax: |  |
Net Unrealized Gains (Losses) Arising During the Period | 8,380 | 24,195
Amortization of Unrealized Holding (Gains) Losses on HTM Securities | 4,558 | 5,081
Net Unrealized Gains (Losses) on Investment Securities | 12,938 | 29,276
Amortization of Net Actuarial Losses (Gains) | 214 | 128
Amortization of Prior Service Credit | (45) | (44)
Defined Benefit Plans, Net | 169 | 84
Total Other Comprehensive Income | $ 13,107 | $ 29,360

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