EMPLOYEE BENEFITS (Details 5) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of activity related to the stock options
Cash received from options exercised			$ 17,000
Stock options
Stock based compensation plan
Compensation expense		0	41,000
Summary of activity related to the stock options
Intrinsic value of options exercised	7,000		16,000
Cash received from options exercised			17,000
Tax benefit realized from option exercises			6,000
Restricted stock
Stock based compensation plan
Compensation expense	1,185,000	909,000	728,000
Shares
Unvested at the beginning of the period (in shares)	211,371
Granted (in shares)	21,993	68,588	43,850
Vested (in shares)	(55,207)
Forfeited (in shares)	(230)
Unvested at the end of the period (in shares)	177,927	211,371
Weighted Average Grant-Date Fair Value
Unvested at the beginning of the period (in dollars per share)	$ 21.56
Granted (in dollars per share)	$ 19.82
Vested (in dollars per share)	$ 21.46
Forfeited (in dollars per share)	$ 22.06
Unvested at the end of the period (in dollars per share)	$ 21.38	$ 21.56
Additional disclosure
Total fair value of shares vested	1,140,000	774,000	280,000
Total unrecognized compensation costs	$ 2,466,000
Weighted-average period over which cost expected to be recognized	3 years 6 months
Restricted stock | Three year ratable vesting
Additional disclosure
Numbers of shares expected to vest		5,000
Vesting period (in years)		3 years
Restricted stock | Five year specified vesting schedule
Additional disclosure
Numbers of shares expected to vest	21,993	44,588	29,420
Vesting period (in years)	5 years	5 years	5 years
Percentage of award vesting one third after year three, one third after year four, and one third vesting after year five	33.00%	33.00%	33.00%
Year in vesting schedule in which one-third of the awards vest, period one	3	3	3
Year in vesting schedule in which one-third of the awards vest, period two	4	4	4
Year in vesting schedule in which one-third of the awards vest, period three	5	5	5
Restricted stock | Seven year specified vesting schedule
Additional disclosure
Numbers of shares expected to vest		19,000	10,000
Vesting period (in years)		7 years	7 years
Percentage of award vesting one third after year five, one third after year six, and one third vesting after year seven		33.00%	33.00%
Year in vesting schedule in which one-third of the awards vest, period one		5	5
Year in vesting schedule in which one-third of the awards vest, period two		6	6
Year in vesting schedule in which one-third of the awards vest, period three		7	7
Restricted stock | Five year ratable vesting
Additional disclosure
Numbers of shares expected to vest			4,430
Vesting period (in years)			5 years