RETIREMENT AND POSTRETIREMENT PLANS - Funded status of the Employee Retirement Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
BNB Bank Pension Plan
Reconciliation of projected benefit obligation:
Projected benefit obligation at beginning of year	$ 34,495
Acquired in the Merger		$ 33,897
Service cost	807	893
Interest cost	793	609
Actuarial (gain) loss	(7,111)	(304)
Benefit payments	(1,064)	(600)
Projected benefit obligation at end of year	27,920	34,495
Plan assets at fair value (investments in trust funds managed by trustee)
Balance at beginning of year	47,857
Acquired in the Merger		43,685
Return on plan assets	(8,221)	4,772
Benefit payments	(1,064)	(600)
Balance at end of year	38,572	47,857
Funded status at end of year	10,652	13,362
Employee Retirement Plan
Reconciliation of projected benefit obligation:
Projected benefit obligation at beginning of year	24,961	26,891
Interest cost	622	562	$ 732
Actuarial (gain) loss	(5,004)	(903)
Benefit payments	(1,558)	(1,589)
Projected benefit obligation at end of year	19,021	24,961	26,891
Plan assets at fair value (investments in trust funds managed by trustee)
Balance at beginning of year	28,693	27,142
Return on plan assets	(4,542)	3,140
Benefit payments	(1,558)	(1,589)
Balance at end of year	22,593	28,693	27,142
Funded status at end of year	3,572	3,732
RETIREMENT PLANS | BMP and Outside Director Retirement Plan
Reconciliation of projected benefit obligation:
Projected benefit obligation at beginning of year		9,328	9,360
Interest cost		12	234
Actuarial (gain) loss		(277)	505
Benefit payments		(9,063)	(771)
Projected benefit obligation at end of year			9,328
Plan assets at fair value (investments in trust funds managed by trustee)
Contributions		9,063	771
Benefit payments		(9,063)	(771)
Funded status at end of year			(9,328)
POSTRETIREMENT PLANS
Reconciliation of projected benefit obligation:
Projected benefit obligation at beginning of year		13	1,608
Interest cost			42
Actuarial (gain) loss			105
Curtailment gain	$ (1,600)		(1,577)
Benefit payments		(13)	(165)
Projected benefit obligation at end of year			13
Plan assets at fair value (investments in trust funds managed by trustee)
Contributions		13	165
Benefit payments		$ (13)	(165)
Funded status at end of year			$ (13)