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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) segment $ / shares shares	Mar. 31, 2019 USD ($) shares	Dec. 31, 2019 USD ($)
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	$ 60,600,000		$ 51,900,000
Threshold period for loan	30 days
Threshold for determining nonaccrual status	90 days
Closing stock price of common stock \| $ / shares	$ 17.95
Stock options granted \| shares	0
Issuance of shares for Employee Stock Purchase Plan, shares \| shares	0	10,176
Antidilutive securities \| shares	570,102	243,747
Assets under management and/or administration	$ 6,400,000,000		$ 7,500,000,000
Percentage of assets under management	14.00%
Impairment of intangible assets	$ 0
Restricted stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Shares granted \| shares	439,270
Compensation cost	$ 1,500,000	$ 1,400,000
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	130,832
Restricted Stock Units [Member]
Summary Of Significant Accounting Policies [Line Items]
Unrecognized compensation cost	$ 15,800,000
Weighted average period over which unrecognized compensation is expected to be recognized (in years)	1 year 9 months 3 days
Employee Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Compensation cost	$ 41,000	$ 45,000
Number of share purchase rights authorized \| shares	150,000
Share purchase rights offering period	12 months
Percentage of closing market price on purchase date	85.00%
Substandard [Member]
Summary Of Significant Accounting Policies [Line Items]
Loan reserve multiple	3.5		3.5
Special Mention [Member]
Summary Of Significant Accounting Policies [Line Items]
Loan reserve multiple	2.25		2.25
Consumer and Other [Member]
Summary Of Significant Accounting Policies [Line Items]
Threshold for determining nonaccrual status	120 days
Small Business Administration Loans [Member]
Summary Of Significant Accounting Policies [Line Items]
Loans held for sale	$ 4,100,000		$ 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%
Peapack-Gladstone Mortgage Group, Inc. [Member] \| Peapack-Gladstone Realty, Inc [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of interest owned	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%
Peapack Ventures, LLC [Member] \| Peapack-Gladstone Realty, Inc [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of interest owned	21.00%