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, 2021
Dec. 31, 2020
Dec. 31, 2019
May 20, 2019
Apr. 21, 2015
Defined Benefit Plan Disclosure [Line Items]          
Deferred compensation plans obligation to Board of Directors $ 17,500,000 $ 15,800,000      
Maximum term of stock options 10 years        
Stock options granted 0        
Vesting period of stock awards 5 years        
Number of stock option awards exercised 104,514 46,278 56,619    
Intrinsic value of stock options exercised $ 903,000 $ 555,000 $ 684,000    
Fair value of stock options exercised 4,000,000.0 1,600,000 2,100,000    
Cash received from the exercise of stock options 3,100,000 1,000,000.0 1,400,000    
Tax benefit from exercise of equity-based awards $ 159,000 112,000 127,000    
Restricted stock vesting percentage 33.33%        
Intrinsic value of stock options outstanding $ 529,246 $ 798,000 $ 2,300,000    
2011 Plan          
Defined Benefit Plan Disclosure [Line Items]          
Number of shares authorized to be issued, maximum         1,000,000
2015 Plan          
Defined Benefit Plan Disclosure [Line Items]          
Number of shares authorized to be issued, maximum       2,500,000 2,500,000
Amended 2015 Plan          
Defined Benefit Plan Disclosure [Line Items]          
Plan expiration date May 03, 2031        
Number of shares authorized to be issued, maximum       4,000,000  
Number of shares available for future issuance 1,855,601        
Restricted Stock          
Defined Benefit Plan Disclosure [Line Items]          
Restricted stock units, vesting terms RSAs vest one-third on each of the first, second and third anniversaries from the date of the grant        
Restricted Stock and Performance Stock Awards | Minimum          
Defined Benefit Plan Disclosure [Line Items]          
Vesting period of stock awards 3 years        
Restricted Stock and Performance Stock Awards | Maximum          
Defined Benefit Plan Disclosure [Line Items]          
Vesting period of stock awards 4 years        
1% through 3%          
Defined Benefit Plan Disclosure [Line Items]          
Percentage of employer's match for 401(k) plan 100.00%        
1% through 3% | Minimum          
Defined Benefit Plan Disclosure [Line Items]          
Percentage of employee's gross pay for 401(k) plan 1.00%        
1% through 3% | Maximum          
Defined Benefit Plan Disclosure [Line Items]          
Percentage of employee's gross pay for 401(k) plan 3.00%        
4% through 5%          
Defined Benefit Plan Disclosure [Line Items]          
Percentage of employer's match for 401(k) plan 50.00%        
4% through 5% | Minimum          
Defined Benefit Plan Disclosure [Line Items]          
Percentage of employee's gross pay for 401(k) plan 4.00%        
4% through 5% | Maximum          
Defined Benefit Plan Disclosure [Line Items]          
Percentage of employee's gross pay for 401(k) plan 5.00%        
Access National Bank          
Defined Benefit Plan Disclosure [Line Items]          
Maximum term of stock options   5 years      
Vesting period of stock awards   4 years