EMPLOYEE BENEFITS AND STOCK BASED COMPENSATION (Narrative) (Details)		12 Months Ended
	May 04, 2021 shares	Dec. 31, 2023 USD ($) item shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares
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