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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract] |  |  |
Unrealized gains (losses) arising during the period on available for sale securities, tax | $ 1,223 | $ (259) | $ 589
Reclassification adjustment for net gain on sales of available for sale securities included in net income, tax | (394) | (29) | (14)
Change in defined benefit plans, tax | (79) | 363 | 4
Reclassification adjustment for settlement gains and activity related to benefit plans, tax | $ (26) | $ (156) | $ (3)
Income tax impacts of the components of other comprehensive income | 21.00% | 21.00% | 34.00%

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