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SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Activity of Non-Performance Based and Performance Based Options
A summary of the activity of non-performance-based and performance-based options as of December 31, 2017 is presented below.
 
Non-Performance-Based
 
Performance-Based
 
Shares
 
Weighted Average Exercise Price
 
Weighted Average Contractual Term
 
Aggregate Intrinsic Value
$ (000)
 
Shares
 
Weighted Average Exercise Price
 
Weighted Average Contractual Term
 
Aggregate Intrinsic Value
$ (000)
Under option, beginning of year
58,603

 
$
14.76

 
 
 
 
 
142,910

 
$
15.06

 
 
 
 
Granted
—

 
—

 
 
 
 
 
—

 
—

 
 
 
 
Exercised
(11,309
)
 
14.76

 
 
 
$
167

 
(102,309
)
 
17.62

 
 
 
$
1,803

Forfeited
—

 
—

 
 
 
 
 
(3,588
)
 
21.35

 
 
 
 
Under option, end of year
47,294

 
$
14.76

 
0.14
 
$
1,519

 
37,013

 
$
7.36

 
1.07
 
$
1,463

Exercisable at end of year
47,294

 
$
14.76

 
0.14
 
$
1,519

 
37,013

 
$
7.36

 
1.07
 
$
1,463


A summary of the activity of non-performance-based and performance-based options as of December 31, 2016 is presented below.
 
Non-Performance-Based
 
Performance-Based
 
Shares
 
Weighted Average Exercise Price
 
Weighted Average Contractual Term
 
Aggregate Intrinsic Value
$ (000)
 
Shares
 
Weighted Average Exercise Price
 
Weighted Average Contractual Term
 
Aggregate Intrinsic Value
$ (000)
Under option, beginning of year
72,483

 
$
18.55

 
 
 
 
 
224,132

 
$
16.92

 
 
 
 
Granted
—

 
—

 
 
 
 
 
—

 
—

 
 
 
 
Exercised
(13,880
)
 
14.38

 
 
 
$
200

 
(40,714
)
 
14.68

 
 
 
$
765

Forfeited
—

 
—

 
 
 
 
 
(40,508
)
 
19.67

 
 
 
 
Under option, end of year
58,603

 
$
14.76

 
1.14
 
$
1,620

 
142,910

 
$
15.06

 
1.22
 
$
3,909

Exercisable at end of year
58,603

 
$
14.76

 
1.14
 
$
1,620

 
142,910

 
$
15.06

 
1.22
 
$
3,909


A summary of the activity of non-performance-based and performance-based options as of December 31, 2015 is presented below.
 
Non-Performance-Based
 
Performance-Based
 
Shares
 
Weighted Average Exercise Price
 
Weighted Average Contractual Term
 
Aggregate Intrinsic Value
$ (000)
 
Shares
 
Weighted Average Exercise Price
 
Weighted Average Contractual Term
 
Aggregate Intrinsic Value
$ (000)
Under option, beginning of year
88,111

 
$
18.00

 
 
 
 
 
359,331

 
$
16.74

 
 
 
 
Granted
—

 
—

 
 
 
 
 
—

 
—

 
 
 
 
Exercised
(15,628
)
 
15.47

 
 
 
$
242

 
(59,507
)
 
15.39

 
 
 
$
916

Forfeited
—

 
—

 
 
 
 
 
(75,691
)
 
17.37

 
 
 
 
Under option, end of year
72,483

 
$
18.55

 
2.13
 
$
1,331

 
224,132

 
$
16.92

 
1.80
 
$
3,697

Exercisable at end of year
72,483

 
$
18.55

 
2.13
 
$
1,331

 
189,587

 
$
15.91

 
2.06
 
$
3,252
Summary of the Status of the Company's Restricted Stock Awards
A summary of the status of the Company’s restricted stock awards as of and for the years ended December 31, 2017, 2016 and 2015 is presented below.
 
2017
 
2016
 
2015
 
Shares
 
Weighted Average Grant Date Fair Value
 
Shares
 
Weighted Average Grant Date Fair Value
 
Shares
 
Weighted Average Grant Date Fair Value
Nonvested shares at beginning of year
279,727

 
$
26.10

 
285,326

 
$
17.29

 
323,151

 
$
13.46

Granted
84,147

 
46.93

 
155,751

 
29.26

 
71,000

 
23.46

Vested
(85,587
)
 
23.30

 
(154,350
)
 
13.10

 
(108,825
)
 
9.96

Forfeited
(472
)
 
47.60

 
(7,000
)
 
23.80

 
—

 
—

Nonvested shares at end of year
277,815

 
33.24

 
279,727

 
26.10

 
285,326

 
17.29