CONDENSED FINANCIAL STATEMENTS OF PEAPACK-GLADSTONE FINANCIAL CORPORATION (PARENT COMPANY ONLY) (STATEMENTS OF CONDITION) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2022	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Cash	$ 5,887	$ 5,937
Interest-earning deposits	181,784	184,138
Total cash and cash equivalents	187,671	190,075
Other assets	53,247	63,587
Total assets	6,476,857	6,353,593		$ 6,077,993
LIABILITIES
Subordinated debt	133,274	132,987
Other liabilities	65,668	69,100
Total liabilities	5,893,176	5,820,613
SHAREHOLDERS’ EQUITY
Common stock	17,831	17,513
Surplus	346,954	338,706
Treasury stock	(110,320)	(97,826)
Retained earnings	394,094	348,798
Accumulated other comprehensive loss	(64,878)	(74,211)
Total shareholders’ equity	583,681	532,980	$ 3,909	$ 546,388	$ 527,122
Total liabilities and shareholders’ equity	6,476,857	6,353,593
Parent Company [Member]
ASSETS
Cash	22,061	7,967
Interest-earning deposits	532	523
Total cash and cash equivalents	22,593	8,490
Investment in subsidiary	690,683	655,490
Other assets	4,498	2,356
Total assets	717,774	666,336
LIABILITIES
Subordinated debt	133,274	132,987
Other liabilities	819	369
Total liabilities	134,093	133,356
SHAREHOLDERS’ EQUITY
Common stock	17,831	17,513
Surplus	346,954	338,706
Treasury stock	(110,320)	(97,826)
Retained earnings	394,094	348,798
Accumulated other comprehensive loss	(64,878)	(74,211)
Total shareholders’ equity	583,681	532,980
Total liabilities and shareholders’ equity	$ 717,774	$ 666,336