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CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
CONDENSED STATEMENTS OF COMPREHENSIVE INCOME        
Change in fair value of available-for-sale securities, net of tax expense (benefit) $ 8,671 $ 1,115 $ 20,327 $ (13,013)
Realized (gain) loss on available-for-sale securities reclassified to net income, net of tax expense (benefit) $ 12 $ (588) $ (937) $ (502)