Quarterly report pursuant to Section 13 or 15(d)

Benefit Plans - Fair Value of Options Granted (Details)

v3.19.1
Benefit Plans - Fair Value of Options Granted (Details)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Retirement Benefits [Abstract]    
Risk-free interest rate 2.50% 2.40%
Expected life of options — years 3 years 4 months 9 days 3 years 6 months 25 days
Expected stock price volatility 26.00% 21.00%
Expected dividend yield 0.80% 0.70%