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STOCK BASED COMPENSATION PLANS (Tables)
 3 Months Ended
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of stock options activity for the equity plan
The following tables summarize stock option activity for the Equity Plan for the three months ended March 31, 2016 and 2015:
 
2016
 
2015
 
Shares
 
Weighted Average Exercise Price
 
Shares
 
Weighted Average Exercise Price
Stock options outstanding at January 1,
3,490,421

 
$16.40
 
3,313,869

 
$15.89
Granted
—

 
—
 
857,000

 
17.18
Exercised
(18,567
)
 
16.34
 
(34,248
)
 
15.11
Forfeited
(6,180
)
 
15.95
 
(32,209
)
 
17.18
Expired
—

 
—
 
—

 
—
Stock options outstanding at March 31,
3,465,674

 
$16.30
 
4,104,412

 
$16.16
Summary of stock options outstanding by issuance period
 
 
Stock Options Outstanding (1)
Issuance
 
Shares
 
Weighted Average Remaining Contractual Term (in years)
 
Weighted Average Exercise Price
March 2012
 
1,101,160

 
6.00
 
$14.72
August 2012
 
36,400

 
6.42
 
13.75
October 2012
 
276,623

 
6.58
 
14.47
February 2013
 
520,360

 
6.92
 
16.48
February 2014
 
596,400

 
7.92
 
18.40
July 2014
 
25,291

 
8.33
 
17.20
February 2015
 
709,440

 
8.92
 
17.18
March 2015
 
200,000

 
9.08
 
17.98
Stock options outstanding at March 31, 2016
 
3,465,674

 
7.31
 
$16.30

Explanatory Note:

(1) As of March 31, 2016, 1,792,875 stock options are fully vested and are currently exercisable. As of March 31, 2016, the intrinsic value of these options was $4.7 million, and such stock options had a weighted average exercise price of $15.74 and a weighted average remaining contractual term of 6.8 years.
Summary of restricted stock activity
The following table summarizes restricted stock activity for the three months ended March 31, 2016 and 2015:
 
2016
 
2015
 
Shares
 
Weighted Average Grant Date Fair Value
 
Shares
 
Weighted Average Grant Date Fair Value
Non-vested restricted stock grants outstanding at January 1,
72,484

 
$16.97
 
205,731

 
$15.45
Granted
169,910

 
17.26
 
53,550

 
17.18
Forfeited
—

 
—
 
—

 
—
Vested
(37,251
)
 
16.87
 
(113,342
)
 
14.99
Non-vested restricted stock grants outstanding at March 31,
205,143

 
$17.23
 
145,939

 
$16.21