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STOCK PLANS AND STOCK BASED COMPENSATION (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Apr. 25, 2012
Apr. 08, 2011
Mar. 31, 2013
Stock options
Mar. 31, 2012
Stock options
Dec. 31, 2012
Stock options
Mar. 31, 2013
Stock options
Officers
Mar. 31, 2013
Stock options
Maximum
Mar. 31, 2013
Restricted stock
Mar. 31, 2012
Restricted stock
Dec. 31, 2012
Restricted stock
Apr. 26, 2007
2007 Stock Incentive Plan
Apr. 23, 2003
2003 Option Plan
Maximum
Stock-based compensation                                        
Number of shares reserved for issuance under the plan                                     650,000 607,754
Award term                             10 years          
Vesting period                           4 years            
Shares                                        
Outstanding, beginning of year (in shares)                     433,132                  
Granted (in shares)                     2,500                  
Exercised (in shares)                     (15,000)                  
Forfeited or expired (in shares)                     (1,000)                  
Outstanding at end of year (in shares)                     419,632   433,132              
Options exercisable at period end (in shares)                     329,622   344,722              
Fully vested and expected to vest (in shares)                     411,602                  
Weighted Average Exercise Price                                        
Outstanding, beginning of year (in dollars per share)                     $ 13.06                  
Granted (in dollars per share)                     $ 14.24                  
Exercised (in dollars per share)                     $ 7.40                  
Forfeited or expired (in dollars per share)                     $ 11.85                  
Outstanding at end of year (in dollars per share)                     $ 13.27   $ 13.06              
Options exercisable at period end (in dollars per share)                     $ 13.81   $ 13.53              
Fully vested and expected to vest (in dollars per share)                     $ 13.30                  
Stock options vested and currently exercisable:                                        
Number (in shares)                     329,622   344,722              
Weighted average exercise price (in dollars per share)                     $ 13.81   $ 13.53              
Aggregate intrinsic value (in dollars)                     $ 931   $ 826              
Weighted average remaining life                     3 years 9 months 18 days   4 years 1 month 6 days              
Compensation expense disclosure                                        
Compensation expense                     36 17       105 35      
Fair value of options granted using the weighted average assumptions as of grant date                                        
Risk-free interest rate (as a percent)                     1.26%                  
Expected term                     7 years                  
Expected stock price volatility (as a percent)                     34.50%                  
Dividend yield (as a percent)                     1.69%                  
Unrecognized stock option compensation expense related to unvested awards                                        
April 2013 - December 2013                     108                  
2014                     120                  
2015                     113                  
2016                     3                  
Additional disclosures                                        
Closing price of common stock (in dollars per share) $ 13.38 $ 12.25 $ 11.58 $ 11.83 $ 9.29 $ 9.44 $ 8.80 $ 9.53 $ 11.85 $ 9.68                    
Shares                                        
Nonvested at the beginning of the period (in shares)                               94,305        
Granted (in shares)                               0   48,061    
Vested (in shares)                               0        
Forfeited (in shares)                               0        
Nonvested at the end of the period (in shares)                               94,305   94,305    
Weighted Average Grant Date Fair Value                                        
Nonvested at the beginning of the period (in dollars per share)                               $ 10.79        
Granted (in dollars per share)                               $ 0.00        
Vested (in dollars per share)                               $ 0.00        
Forfeited (in dollars per share)                               $ 0.00        
Nonvested at the end of the period (in dollars per share)                               $ 10.79   $ 10.79    
Additional disclosures                                        
Vesting percentage of stock awards on second anniversary of grant date                               80.00%        
Vesting percentage of stock awards on third anniversary of grant date                               20.00%        
Unrecognized compensation expense related to nonvested awards                               $ 640        
Weighted-average period of expected recognition of the cost                               1 year 6 months        
Recognition period of other expense 3 months                                      
Number of trading days prior to the issuance of the stock for determination of average closing price of awards 5 days                                      
Shares awarded 7,200 7,200 7,200 7,200 8,750 9,130 7,902 6,750