CONDENSED FINANCIAL STATEMENTS OF PEAPACK-GLADSTONE FINANCIAL CORPORATION (PARENT COMPANY ONLY) (STATEMENTS OF CASH FLOWS) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities:
Net income	$ 56,622	$ 26,192	$ 47,434
Amortization of subordinated debt costs	1,003	224	224
(Increase)/decrease in other assets	(4,866)	(8,096)	5,111
(Decrease)/increase in other liabilities	226	(10,720)	12,799
Net cash provided by operating activities	75,463	36,720	86,296
Investing activities:
Net cash used in investing activities	(753,798)	(213,995)	(486,965)
Financing activities:
Cash dividends paid on common stock	(3,775)	(3,780)	(3,865)
Exercise of stock options, net stock swaps	187	230	251
Proceeds from issuance of subordinated debt		98,153
Repayments of subordinated debt	(50,000)
Shares repurchase	(28,627)	(6,487)	(21,002)
Net cash provided by financing activities	171,817	622,412	448,081
Net (decrease)/increase in cash and cash equivalents	(506,518)	445,137	47,412
Cash and cash equivalents at beginning of year	653,322	208,185	160,773
Cash and cash equivalents at end of year	146,804	653,322	208,185
Parent Company [Member]
Operating activities:
Net income	56,622	26,192	47,434
Undistributed earnings of Bank	(62,897)	(17,883)	(20,866)
Amortization of subordinated debt costs	1,002	234	224
(Increase)/decrease in other assets	(674)	4,914	(1,186)
(Decrease)/increase in other liabilities	(1,979)	2,176	(24)
Net cash provided by operating activities	(7,926)	15,633	25,582
Financing activities:
Cash dividends paid on common stock	(3,775)	(3,780)	(3,865)
Exercise of stock options, net stock swaps	187	230	251
Proceeds from issuance of subordinated debt		98,143
Repayments of subordinated debt	(50,000)
Shares repurchase	(28,627)	(6,487)	(21,002)
Net cash provided by financing activities	(82,215)	88,106	(24,616)
Net (decrease)/increase in cash and cash equivalents	(90,141)	103,739	966
Cash and cash equivalents at beginning of year	118,193	14,454	13,488
Cash and cash equivalents at end of year	$ 28,052	$ 118,193	$ 14,454