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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)	1 Months Ended	3 Months Ended		9 Months Ended
	May 31, 2020 shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) shares	Sep. 30, 2020 USD ($) segment $ / shares shares	Sep. 30, 2019 USD ($) shares	Nov. 09, 2020 USD ($)	Oct. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of operating segments | segment				2
Federal funds sales periods				1 day
Interest-earning deposits maturities period				1 year
Servicing rights				$ 0
Amount of loans serviced		$ 63,100,000		$ 63,100,000				$ 51,900,000
Threshold period for loan				30 days
Threshold for determining nonaccrual status		90 days		90 days
Loan reserve multiple		2.25		2.25				2.25
Loan modifications				$ 940,200,000
Post-modification outstanding recorded investment		$ 341,000		$ 427,000
Sale of loans servicing released to third party		$ 355,000,000.0
Closing stock price of common stock | $ / shares		$ 15.15		$ 15.15
Stock options granted | shares		0		0
Issuance of shares for Employee Stock Purchase Plan, shares | shares		5,598	0	52,533	18,740
Antidilutive securities | shares		374,366	27,497	207,466	277,677
Assets under management and/or administration		$ 7,600,000,000		$ 7,600,000,000				$ 7,500,000,000
Impairment of intangible assets				$ 0
Warrants [Member]
Summary Of Significant Accounting Policies [Line Items]
Antidilutive securities | shares		109,860		109,860
Restricted stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares granted | shares		0		528,038
Compensation cost		$ 1,800,000	$ 1,500,000	$ 5,100,000	$ 4,400,000
Restricted stock [Member] | Tranche One [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock option vesting term				3 years
Restricted stock [Member] | Tranche Two [Member]
Summary Of Significant Accounting Policies [Line Items]
Stock option vesting term				5 years
Performance Shares [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares granted | shares		0		130,832
Restricted Stock Units [Member]
Summary Of Significant Accounting Policies [Line Items]
Unrecognized compensation cost		$ 13,800,000		$ 13,800,000
Weighted average period over which unrecognized compensation is expected to be recognized (in years)				1 year 7 months 9 days
Employee Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Compensation cost		$ 9,000	$ 41,000	$ 199,000	$ 117,000
Number of share purchase rights authorized | shares		150,000		150,000
Additional common stock to be issued | shares	200,000
Share purchase rights offering period				12 months
Percentage of closing market price on purchase date				85.00%
Deferral [Member]
Summary Of Significant Accounting Policies [Line Items]
Post-modification outstanding recorded investment				$ 827,817,000
Subsequent Event [Member]
Summary Of Significant Accounting Policies [Line Items]
Loan come off deferral status						$ 449,000,000	$ 247,000,000
U.S. Small Business Administration (SBA) Loans [Member]
Summary Of Significant Accounting Policies [Line Items]
Paycheck Protection Program, maximum credit facility		$ 600,000,000		600,000,000
Paycheck protection program loans remaining balance		$ 202,000,000.0		$ 202,000,000.0
Substandard [Member]
Summary Of Significant Accounting Policies [Line Items]
Loan reserve multiple		3.25		3.25				3.25
Consumer and Other [Member] | Closed-end Loans [Member]
Summary Of Significant Accounting Policies [Line Items]
Threshold for determining nonaccrual status		120 days		120 days
Consumer and Other [Member] | Open-end Loans [Member]
Summary Of Significant Accounting Policies [Line Items]
Threshold for determining nonaccrual status		180 days		180 days
Small Business Administration Loans [Member]
Summary Of Significant Accounting Policies [Line Items]
Loans held for sale		$ 4,500,000		$ 4,500,000				$ 4,600,000
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Cash equivalents original maturities period				90 days
Short term borrowings original maturities period				90 days
Finite-Lived Intangible Asset, Useful Life				15 years
Maximum [Member] | Employee Stock Option [Member]
Summary Of Significant Accounting Policies [Line Items]
Option term				10 years
Stock option vesting term				5 years
Maximum [Member] | Employee Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of compensation contributable				15.00%
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life				5 years
Minimum [Member] | Employee Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of compensation contributable				1.00%
Peapack-Gladstone Mortgage Group, Inc. [Member] | Peapack Ventures, LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of interest owned		99.00%		99.00%
Peapack-Gladstone Mortgage Group, Inc. [Member] | Peapack-Gladstone Realty, Inc [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of interest owned		79.00%		79.00%
PGB Trust & Investments of Delaware [Member] | Peapack Ventures, LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of interest owned		1.00%		1.00%
Peapack Ventures, LLC [Member] | Peapack-Gladstone Realty, Inc [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of interest owned		21.00%		21.00%

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