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Stock-Based Compensation | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | 16. Stock-Based Compensation A summary of changes in nonvested restricted stock awards follows:
|  | Shares |  |  | Weighted-average Grant Date Fair Value |
Nonvested at January 1, 2017 |  |  | 100,726 |  |  |  | $17.36 |
Granted |  |  | 39,673 |  |  |  | 25.94 |
Forfeited |  |  | (2,482 | ) |  |  | 21.12 |
Vested |  |  | (43,445 | ) |  |  | 17.54 |
Nonvested at December 31, 2017 |  |  | 94,472 |  |  |  | $20.79 |
As of December 31, 2017 and 2016, there was $1,243 and $1,190, respectively, of total unrecognized compensation cost related to nonvested shares granted under the restricted stock award plan. The fair value of shares vesting during 2017, 2016, and 2015 was $1,035, $624 and $530, respectively. Compensation expense for restricted stock awards was $928 in 2017, $820 in 2016 and $621 in 2015. The number of authorized stock-based awards still available for grant as of December 31, 2017 was 219,800. In addition to the time-based restricted stock disclosed above, the Corporation’s Board of Directors granted performance-based restricted stock awards (“PBRSAs”) with a maximum of 10,000 shares to an employee in 2017. The number of PBRSAs will depend on certain performance conditions and are also subject to service-based vesting.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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