BUSINESS SEGMENTS - Schedule of Income and Total Assets for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Net interest income (expense)	$ 43,978	$ 39,622
Noninterest income	18,059	14,714
Total income	62,037	54,336
Provision for credit losses	1,513	2,375
Compensation and employee benefits	24,586	22,449
Premises and equipment	4,374	4,647
FDIC insurance expense	711	471
Other operating expense	5,903	6,602
Total operating expense	37,087	36,544
INCOME BEFORE INCOME TAX EXPENSE	24,950	17,792
Income tax expense	6,595	4,351
NET INCOME	18,355	13,441
Total assets at period end	6,480,018	6,255,664	$ 6,353,593
Banking Segment [Member]
Net interest income (expense)	42,090	37,999
Noninterest income	3,835	(429)
Total income	45,925	37,570
Provision for credit losses	1,513	2,375
Compensation and employee benefits	18,169	16,403
Premises and equipment	3,613	3,931
FDIC insurance expense	711	471
Other operating expense	3,274	4,166
Total operating expense	27,280	27,346
INCOME BEFORE INCOME TAX EXPENSE	18,645	10,224
Income tax expense	4,930	2,300
NET INCOME	13,715	7,924
Total assets at period end	6,366,729	6,155,011
Peapack Private Segment [Member]
Net interest income (expense)	1,888	1,623
Noninterest income	14,224	15,143
Total income	16,112	16,766
Compensation and employee benefits	6,417	6,046
Premises and equipment	761	716
Other operating expense	2,629	2,436
Total operating expense	9,807	9,198
INCOME BEFORE INCOME TAX EXPENSE	6,305	7,568
Income tax expense	1,665	2,051
NET INCOME	4,640	5,517
Total assets at period end	$ 113,289	$ 100,653