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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, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Other Comprehensive Income (Loss), Before Tax: |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) Arising During the Period | $ (10,263) |  |  | $ (6,771) |  |  | $ (75,360) | $ 60,177
(Gain) Loss on sale, before tax | (83) |  |  |  |  |  | (3,758) | (77)
Amortization of Unrealized Holding (Gains) Losses on HTM Securities | 87 |  |  | 103 |  |  | 593 | 289
Net Unrealized Gains (Losses) on Investment Securities | (10,259) |  |  | (6,668) |  |  | (78,525) | 60,389
Amortization of Net Actuarial Losses (Gains) | 662 |  |  | 570 |  |  | 1,985 | 1,711
Amortization of Prior Service Credit | (62) |  |  | (61) |  |  | (185) | (184)
Defined Benefit Plans, Net | 600 |  |  | 509 |  |  | 1,800 | 1,527
Other Comprehensive Income (Loss) | (9,659) |  |  | (6,159) |  |  | (76,725) | 61,916
Other Comprehensive Income (Loss), Tax Effect: |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) Arising During the Period | (2,719) |  |  | (1,795) |  |  | (19,954) | 15,945
(Gain) Loss on Sale, Tax Effect | (22) |  |  |  |  |  | (1,014) | (21)
Amortization of Unrealized Holding (Gains) Losses on HTM Securities | 23 |  |  | 27 |  |  | 157 | 76
Net Unrealized Gains (Losses) on Investment Securities | (2,718) |  |  | (1,768) |  |  | (20,811) | 16,000
Amortization of Net Actuarial Losses (Gains) | 175 |  |  | 151 |  |  | 525 | 454
Amortization of Prior Service Credit | (16) |  |  | (16) |  |  | (49) | (49)
Defined Benefit Plans, Net | 159 |  |  | 135 |  |  | 476 | 405
Other Comprehensive Income (Loss) | (2,559) |  |  | (1,633) |  |  | (20,335) | 16,405
Other Comprehensive Income (Loss), Net of Tax: |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) Arising During the Period | (7,544) |  |  | (4,976) |  |  | (55,406) | 44,232
(Gain) Loss on Sale | (61) |  |  |  |  |  | (2,744) | (56)
Amortization of Unrealized Holding (Gains) Losses on HTM Securities | 64 |  |  | 76 |  |  | 436 | 213
Net Unrealized Gains (Losses) on Investment Securities | (7,541) |  |  | (4,900) |  |  | (57,714) | 44,389
Amortization of Net Actuarial Losses (Gains) | 487 |  |  | 419 |  |  | 1,460 | 1,257
Amortization of Prior Service Credit | (46) |  |  | (45) |  |  | (136) | (135)
Defined Benefit Plans, Net | 441 |  |  | 374 |  |  | 1,324 | 1,122
Total Other Comprehensive Income (Loss) | $ (7,100) | $ 319 | $ (49,609) | $ (4,526) | $ 8,104 | $ 41,933 | $ (56,390) | $ 45,511

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