Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFITS AND STOCK BASED COMPENSATION (Narrative) (Details)

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EMPLOYEE BENEFITS AND STOCK BASED COMPENSATION (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Apr. 20, 2015
Jan. 01, 2014
Defined Benefit Plan Disclosure [Line Items]          
Deferred compensation plans obligation to Board of Directors $ 9,100,000 $ 10,300,000      
Stock options term from the grant date 4 years 2 months 16 days        
Salaries and benefit expense for incentive compensation $ 1,200,000 $ 898,000 $ 939,000    
Number of stock option awards exercised 60,637 75,282 50,119    
Intrinsic value of stock options exercised $ 544,000 $ 573,000 $ 268,000    
Fair value of stock options exercised 1,400,000 1,800,000 1,200,000    
Cash received from the exercise of stock options 886,000 1,200,000 927,000    
Tax benefit from exercise of equity-based awards 178,000 187,000 54,000    
Fair value of stock options vested $ 316,000 313,000 335,000    
Restricted stock vesting percentage 50.00%        
Intrinsic value of stock options outstanding $ 2,793,148 $ 3,100,000 $ 3,500,000    
Unamortized compensation costs $ 5,608,000        
Minimum [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Hours of service required for eligibility under plan 1000 hours        
1% through 3% [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Percentage of employer's match for 401(k) plan 100.00%        
1% through 3% [Member] | Minimum [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Percentage of employee's gross pay for 401(k) plan 1.00%        
1% through 3% [Member] | Maximum [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Percentage of employee's gross pay for 401(k) plan 3.00%        
4% through 5% [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Percentage of employer's match for 401(k) plan 50.00%        
4% through 5% [Member] | Minimum [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Percentage of employee's gross pay for 401(k) plan 4.00%        
4% through 5% [Member] | Maximum [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Percentage of employee's gross pay for 401(k) plan 5.00%        
Stock and Incentive Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Number of shares authorized to be issued, maximum 2,500,000        
Number of shares available for future issuance 1,865,589        
2011 Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Number of shares authorized to be issued, maximum       1,000,000  
StellarOne Bank [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Number of shares equivalent to each share of acquired entity         0.9739