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Consolidated Statements of Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement [Abstract]        
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements $ 44 $ 71 $ 149 $ 220
Accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities 0 5 0 1,543
Income tax expense from reclassification $ (9) $ (23) $ (31) $ 463