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)
 12 Months Ended
May 04, 2021
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Dec. 31, 2023
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Dec. 31, 2022
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Dec. 31, 2021
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Defined Benefit Plan Disclosure [Line Items]        
Plan expiration date May 03, 2031      
Number of shares available for future issuance | shares   1,204,260    
Maximum term of stock options   10 years    
Vesting period of stock awards   5 years    
Number of stock option awards exercised | shares   23,796 111,774 104,514
Intrinsic value of stock options exercised   $ 87,000 $ 701,000 $ 903,000
Fair value of stock options exercised   864,500 4,600,000 4,000,000.0
Cash received from the exercise of stock options   777,500 3,900,000 3,100,000
Tax benefit from exercise of equity-based awards   $ 9,000 122,000 159,000
Restricted stock vesting percentage   33.33%    
Intrinsic value of stock options outstanding   $ 51,777 105,665 $ 529,000
Performance Stock        
Defined Benefit Plan Disclosure [Line Items]        
Number of performance measures | item   2    
Weight of each performance measure   50.00%    
Postretirement Life Insurance        
Defined Benefit Plan Disclosure [Line Items]        
Liabilities for post retirement benefits payable to other beneficiaries   $ 12,300,000 13,300,000  
Employees, Current and Former Members of Board of Directors        
Defined Benefit Plan Disclosure [Line Items]        
Deferred compensation plans   $ 16,400,000 $ 14,900,000  
Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Number of shares authorized to be issued, maximum | shares 4,000,000      
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    
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