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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Changes in Nonvested Restricted Stock Awards
A summary of changes in nonvested restricted stock awards follows: 
 
Shares
 
Weighted-average
Grant Date
Fair Value
Nonvested at January 1, 2018
94,472

 
$
20.79

Granted
24,508

 
26.92

Forfeited
(361
)
 
26.19

Vested
(42,730
)
 
19.87

Nonvested at December 31, 2018
75,889

 
$
23.20