STOCK BASED COMPENSATION (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
STOCK BASED COMPENSATION
Stock based compensation expense	$ 203,000
Stock options
STOCK BASED COMPENSATION
Stock based compensation expense	82,000
Number of Stock Options
Outstanding at the beginning of the period (in shares)	877,669
Granted (in shares)	254,650
Exercised (in shares)	(4,608)
Forfeited / Cancelled (in shares)	(100)
Outstanding at the end of the period (in shares)	1,127,611	877,669
Exercisable at the end of the period (in shares)	588,976
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 11.57
Granted (in dollars per share)	$ 17.00
Exercised (in dollars per share)	$ 11.11
Forfeited / Cancelled (in dollars per share)	$ 12.94
Outstanding at the end of the period (in dollars per share)	$ 12.80	$ 11.57
Exercisable at the end of the period (in dollars per share)	$ 11.20
Weighted Average Remaining Contractual Life
Outstanding at the beginning of the period	6 years 10 months 24 days	6 years 3 months 18 days
Outstanding at the end of the period	6 years 10 months 24 days	6 years 3 months 18 days
Exercisable at the end of the period	4 years 10 months 24 days
Aggregate Intrinsic Value
Outstanding at the beginning of the period	4,461,000
Outstanding at the end of the period	4,645,000	4,461,000
Exercisable at the end of the period	3,353,000
Number of Stock Options, Unvested
Unvested at the beginning of the period (in shares)	310,661
Granted (in shares)	254,650
Vested (in shares)	(26,676)
Unvested at the end of the period (in shares)	538,635	310,661
Weighted Average Grant Date Fair Value, Unvested
Unvested at the beginning of the period (in dollars per share)	$ 3.36
Granted (in dollars per share)	$ 4.20
Vested (in dollars per share)	$ 2.72
Unvested at the end of the period (in dollars per share)	$ 3.79	$ 3.36
Compensation cost not yet recognized, nonvested awards
Expected future compensation expense, non-vested options	1,900,000
Weighted average period	4 years 4 months 24 days
Assumptions used to determine fair value of options granted
Expected dividend yield (as a percent)	2.22%
Expected volatility (as a percent)	31.12%
Risk-free interest rate (as a percent)	1.19%
Expected option life	6 years 6 months
Restricted stock
STOCK BASED COMPENSATION
Stock based compensation expense	121,000
Compensation cost not yet recognized, nonvested awards
Weighted average period	4 years 4 months 24 days
Number of Restricted Shares
Unvested at the beginning of the period (in shares)	130,557
Granted (in shares)	122,450
Vested (in shares)	(6,127)
Unvested at the end of the period (in shares)	246,880
Weighted Average Grant Date Fair Value
Unvested at the beginning of the period (in dollars per share)	$ 12.41
Granted (in dollars per share)	$ 17.00
Vested (in dollars per share)	$ 11.09
Unvested at the end of the period (in dollars per share)	$ 14.72
Expected future compensation expense, restricted shares	$ 3,300,000
Performance based restricted stock
Number of Restricted Shares
Granted (in shares)	39,250