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Accumulated Other Comprehensive Income (Loss) - Other Comprehensive Loss and Related Tax Effects (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) |  |  |
Unrealized gain (loss) on investment securities available-for-sale | $ 8,779 | $ 5,109 | $ (2,014)
Net gain on the sale of investment securities available-for-sale | (918) | (23) |
Other comprehensive income on available-for-sale debt securities | 7,861 | 5,086 | (2,014)
Amortization of actuarial loss (2) | 218 | 227 | 194
Actuarial gain (loss) | (1,616) | 412 | (785)
Change in benefit plan liabilities | (1,398) | 639 | (591)
Net change in derivatives | 315 | 441 | 246
Other comprehensive income (loss) | 6,778 | 6,166 | (2,359)
Income tax (benefit) | 1,424 | 1,295 | (496)
Other comprehensive income (loss) | $ 5,354 | $ 4,871 | $ (1,863)

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