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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation, Stock Options, Activity
The following table provides information about options outstanding for the three months ended June 30, 2018:
 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Grant Date
Fair Value
Options outstanding, March 31, 2018
71,321

 
$
19.59

 
$
4.75

Forfeited
—

 
—

 
—

Expired
—

 
—

 
—

Exercised
(4,750
)
 
$
24.26

 
$
5.27

Options outstanding, June 30, 2018
66,571

 
$
19.26

 
$
4.71

 
The following table provides information about options outstanding for the six months ended June 30, 2018:
 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Grant Date
Fair Value
Options outstanding, December 31, 2017
115,246

 
$
20.73

 
$
4.86

Forfeited
—

 
—

 
—

Expired
—

 
—

 
—

Exercised
(48,675
)
 
$
22.74

 
$
5.05

Options outstanding, June 30, 2018
66,571

 
$
19.26

 
$
4.71
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value
 
Proceeds, related tax benefits realized from options exercised and intrinsic value of options exercised were as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(dollars in thousands)
2018
 
2017
 
2018
 
2017
Proceeds from exercise of stock options
$
115

 
$
355

 
$
1,107

 
$
1,005

Related tax benefit recognized
21

 
86

 
231

 
227

Net proceeds of options exercised
$
136

 
$
441

 
$
1,338

 
$
1,232

 
 
 
 
 
 
 
 
Intrinsic value of options exercised
$
99

 
$
326

 
$
1,098

 
$
874
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable
The following table provides information about options outstanding and exercisable at June 30, 2018:
(dollars in thousands, except share data and exercise price)
Outstanding
 
Exercisable
Number of shares
66,571

 
66,571

Weighted average exercise price
$
19.26

 
$
19.26

Aggregate intrinsic value
$
1,800

 
$
1,800

Weighted average remaining contractual term in years
1.0

 
1.0
Schedule of Nonvested Restricted Stock Units Activity
The following table details the RSUs for the three and six months ended June 30, 2018:
 
Three Months Ended June 30, 2018
 
Six Months Ended June 30, 2018
 
Number of Shares
 
Weighted
Average
Grant Date
Fair Value
 
Number of Shares
 
Weighted
Average
Grant Date
Fair Value
Beginning balance
77,107

 
$
36.13

 
75,707

 
$
35.80

Granted
—

 
$
—

 
2,400

 
$
43.95

Vested
(7,347
)
 
$
29.17

 
(8,347
)
 
$
29.28

Forfeited
(1,165
)
 
$
35.36

 
(1,165
)
 
$
35.36

Ending balance
68,595

 
$
36.89

 
68,595

 
$
36.89
Schedule of Nonvested Performance-based Units Activity
The following table details the PSUs for the three and six months ended June 30, 2018:
 
Three Months Ended June 30, 2018
 
Six Months Ended June 30, 2018
 
Number of Shares
 
Weighted
Average
Grant Date
Fair Value
 
Number of Shares
 
Weighted
Average
Grant Date
Fair Value
Beginning balance
168,453

 
$
24.76

 
168,453

 
$
24.76

Granted
—

 
$
—

 
—

 
$
—

Vested
(33,784
)
 
$
16.91

 
(33,784
)
 
$
16.91

Forfeited
(4,409
)
 
$
26.57

 
(4,409
)
 
$
26.57

Ending balance
130,260

 
$
26.73

 
130,260

 
$
26.73