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Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Other comprehensive income (loss) |  |
Net unrealized gain on investment securities available-for-sale | $ 1,946 | $ 9,696
Income tax | 409 | 2,036
Net of income taxes | 1,537 | 7,660
Benefit plan adjustments | (7,977) | (7,977)
Income tax benefit | 1,675 | 1,675
Net of income taxes | (6,302) | (6,302)
Derivative adjustments | 1,244 | 1,002
Income tax | 262 | 211
Net of income taxes | 982 | 791
Accumulated other comprehensive income (loss) | $ (3,782) | $ 2,149

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