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Consolidated Statements of Income (unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Income Statement [Abstract] |  |
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements | $ 6 | $ 58
Accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities | 148 | 0
Income tax expense from reclassification | $ 30 | $ (12)

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