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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]    
Changes in benefit obligations and plan assets for defined benefit and postretirement benefit plans, deferred income taxes $ (5) $ 0
Unrealized gain (loss) on available for sale securities, deferred income tax $ 484 $ 807