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Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Stock Option Plan Award Activity The following is a summary of the Company’s stock option award activity during the nine months ended September 30, 2020:
 SharesWeighted-
Average
Exercise Price		Weighted-Average
Remaining Contractual
Term in Years		Aggregate
Intrinsic
Value
Outstanding at January 1, 2020121,260 $20.80 5.33$1,842,687 
Granted8,225 36.26 
Exercised(19,413)17.22 
Forfeited(2,205)29.25 
Expired(6,733)28.96 
Outstanding at September 30, 2020101,134 22.02 4.97873,423 
Exercisable85,334 19.99 4.36851,612 
Expected to vest, assuming a 0% forfeiture rate over the vesting term
14,099 $34.96 8.75$— 
Weighted-Average Assumptions Used in Determining Fair Value of Options Granted The fair value of options granted for the nine months ended September 30, 2020 and 2019 were determined using the following weighted-average assumptions as of the grant date.
September 30, 2020September 30, 2019
Annual dividend yield1.60 %1.72 %
Expected volatility21.67 %21.68 %
Risk-free interest rate1.38 %2.64 %
Expected term6.50 years6.50 years
Weighted-average grant date fair value per option granted$7.14 $7.24 
Outstanding Restricted Stock Awards
The following is a summary of the Company’s non-vested restricted stock award activity during the nine months ended September 30, 2020:
 SharesWeighted-Average
Grant-Date Fair
Value Per Share		Aggregate Intrinsic Value Per Share
Non-vested at January 1, 202012,290 $33.32 
Granted13,600 36.26 
Vested(6,816)34.60 
Forfeited(1,690)34.15 
Non-Vested at September 30, 202017,384 $35.03 $29.63 
Expected to vest assuming a 0% forfeiture rate over the vesting term
17,384 $35.03 $29.63