CONDENSED FINANCIAL STATEMENTS OF PEAPACK-GLADSTONE FINANCIAL CORPORATION (PARENT COMPANY ONLY) (STATEMENTS OF CASH FLOWS) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 4,343	$ 5,383	$ 5,238	$ 5,008	$ 4,212	$ 3,864	$ 3,783	$ 3,031	$ 2,395	$ 1,964	$ 2,009	$ 2,893	$ 19,972	$ 14,890	$ 9,261
Gain on securities available for sale													(527)	(260)	(840)
(Increase)/decrease in other assets													(476)	2,590	5,643
Increase/(decrease) in other liabilities													3,504	1,153	2,315
Net cash provided by operating activities													30,306	27,263	32,702
Cash flows from investing activities:
Proceeds from sales and calls of securities available for sale													46,254	35,411	54,881
Net cash used in by investing activities													(625,427)	(745,159)	(407,686)
Cash flows from financing activities:
Cash dividends paid on common stock													(3,100)	(2,414)	(1,802)
Exercise of stock options, net stock swaps													$ 86	174	30
Net proceeds, rights offering														48,358	41,100
Issuance of common shares (DRIP program)													$ 13,648	7,429	3,248
Purchase of shares of profit sharing plan														70	130
Net cash provided by financing activities													$ 634,074	713,956	290,903
Net increase/(decrease) in cash and cash equivalents													39,124	(3,940)	(84,081)
The Corporation [Member]
Cash flows from operating activities:
Net income													19,972	14,890	9,261
Undistributed (earnings)/loss of Bank													$ (20,316)	$ (15,310)	(8,279)
Gain on securities available for sale															(2)
(Increase)/decrease in other assets													$ (194)	$ 427	(37)
Increase/(decrease) in other liabilities													81	(63)	179
Net cash provided by operating activities													(457)	(56)	$ 1,122
Cash flows from investing activities:
Capital contribution to subsidiary													$ (18,000)	$ (88,674)
Proceeds from sales and calls of securities available for sale															$ 213
Net cash used in by investing activities													$ (18,000)	$ (88,674)	213
Cash flows from financing activities:
Cash dividends paid on common stock													(3,100)	(2,414)	(1,802)
Exercise of stock options, net stock swaps													$ 86	174	30
Net proceeds, rights offering														48,358	41,100
Issuance of common shares (DRIP program)													$ 13,648	7,429	3,248
Purchase of shares of profit sharing plan														70	130
Net cash provided by financing activities													$ 10,634	53,617	42,706
Net increase/(decrease) in cash and cash equivalents													(7,823)	(35,113)	44,041
Cash and cash equivalents at beginning of period				$ 9,827				$ 44,940				$ 899	9,827	44,940	899
Cash and cash equivalents at end of period	$ 2,004				$ 9,827				$ 44,940				$ 2,004	$ 9,827	$ 44,940