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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract] |  |  |
Unrealized gains (losses) arising during the period on available for sale securities, tax | $ 131 | $ 1,223 | $ (259)
Reclassification adjustment for net gain on sales of available for sale securities included in net income, tax | (98) | (394) | (29)
Change in defined benefit plans, tax | (134) | (79) | 363
Reclassification adjustment for settlement gains and activity related to benefit plans, tax | $ (6) | $ (26) | $ (156)
Income tax impacts of the components of other comprehensive income | 21.00% | 21.00% | 21.00%

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- Definition Amount, before adjustment, of tax expense (benefit) for unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes tax expense (benefit) for 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 + Details
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