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Stock-based Compensation (Tables)
 9 Months Ended
Sep. 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 September 30, 2018:
 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Grant Date
Fair Value
Options outstanding, June 30, 2018
66,571

 
$
19.26

 
$
4.71

Forfeited
—

 
—

 
—

Expired
—

 
—

 
—

Exercised
(15,150
)
 
$
23.02

 
$
5.09

Options outstanding, September 30, 2018
51,421

 
$
18.15

 
$
4.60

 
The following table provides information about options outstanding for the nine months ended September 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
(63,825
)
 
$
22.81

 
$
5.06

Options outstanding, September 30, 2018
51,421

 
$
18.15

 
$
4.60
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
September 30,
 
Nine Months Ended
September 30,
(dollars in thousands)
2018
 
2017
 
2018
 
2017
Proceeds from exercise of stock options
$
349

 
$
283

 
$
1,456

 
$
1,288

Related tax benefit recognized
81

 
96

 
312

 
402

Net proceeds of options exercised
$
430

 
$
379

 
$
1,768

 
$
1,690

 
 
 
 
 
 
 
 
Intrinsic value of options exercised
$
386

 
$
273

 
$
1,484

 
$
1,147
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 September 30, 2018:
(dollars in thousands, except share data and exercise price)
Outstanding
 
Exercisable
Number of shares
51,421

 
51,421

Weighted average exercise price
$
18.15

 
$
18.15

Aggregate intrinsic value
$
1,478

 
$
1,478

Weighted average remaining contractual term in years
0.9

 
0.9
Schedule of Nonvested Restricted Stock Units Activity
The following table details the RSUs for the three and nine months ended September 30, 2018:
 
Three Months Ended
September 30, 2018
 
Nine Months Ended
September 30, 2018
 
Number of Shares
 
Weighted
Average
Grant Date
Fair Value
 
Number of Shares
 
Weighted
Average
Grant Date
Fair Value
Beginning balance
68,595

 
$
36.89

 
75,707

 
$
35.80

Granted
23,843

 
$
46.29

 
26,243

 
$
46.07

Vested
(16,122
)
 
$
33.65

 
(24,469
)
 
$
32.16

Forfeited
—

 
$
—

 
(1,165
)
 
$
35.36

Ending balance
76,316

 
$
40.51

 
76,316

 
$
40.51
Schedule of Nonvested Performance-based Units Activity
The following table details the PSUs for the three and nine months ended September 30, 2018:
 
Three Months Ended
September 30, 2018
 
Nine Months Ended
September 30, 2018
 
Number of Shares
 
Weighted
Average
Grant Date
Fair Value
 
Number of Shares
 
Weighted
Average
Grant Date
Fair Value
Beginning balance
130,260

 
$
26.73

 
168,453

 
$
24.76

Granted
40,722

 
$
44.56

 
40,722

 
$
44.56

Vested
(48,056
)
 
$
16.04

 
(81,840
)
 
$
16.40

Forfeited
—

 
$
—

 
(4,409
)
 
$
26.57

Ending balance
122,926

 
$
36.82

 
122,926

 
$
36.82