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Consolidated Statements of Income (unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]    
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements $ 21  
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements, before 2017-12 adoption   $ 6
Accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities 0 148
Income tax expense from reclassification $ (4) $ 30