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Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements $ 224 $ 63 $ 164
Accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities 2,190 148 0
Accumulated other comprehensive income reclassifications on employee benefits 0 23 84
Income tax expense from reclassification $ 413 $ 13 $ (52)