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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) |  |  |
Unrealized gain (loss) on investment securities available-for-sale | $ (11,487) | $ 8,779 | $ 5,109
Net gain on the sale of investment securities available-for-sale |  | (918) | (23)
Other comprehensive income on available-for-sale debt securities | (11,487) | 7,861 | 5,086
Amortization of actuarial loss (2) | 301 | 218 | 227
Actuarial gain (loss) | 1,808 | (1,616) | 412
Change in benefit plan liabilities | 2,109 | (1,398) | 639
Net change in derivatives | (322) | 315 | 441
Other comprehensive income (loss) | (9,700) | 6,778 | 6,166
Income tax (benefit) | (2,037) | 1,424 | 1,295
Other comprehensive income (loss) | $ (7,663) | $ 5,354 | $ 4,871

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- Definition Amount, before tax and adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 + Details
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