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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 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 six months ended June 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(14,434) 15.99  
Forfeited(2,205) 29.25  
Outstanding at June 30, 2020112,846  22.38  4.74501,807  
Exercisable97,046  20.65  4.14489,312  
Expected to vest, assuming a 0% forfeiture rate over the vesting term
16,169  $34.19  7.86$1,662  
Weighted-Average Assumptions Used in Determining Fair Value of Options Granted The fair value of options granted for the six months ended June 30, 2020 and 2019 were determined using the following weighted-average assumptions as of the grant date.
June 30, 2020June 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 six months ended June 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 June 30, 202017,384  $35.03  $24.15  
Expected to vest assuming a 0% forfeiture rate over the vesting term
17,384  $35.03  $24.15