MERGERS AND ACQUISITIONS - ASSETS AQCUIRED AND LIABILITIES ASSUMED (Details) - USD ($) $ in Thousands			9 Months Ended
		Mar. 01, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Assets:
Cash and cash equivalents			$ 96,090		$ 60,783	[1]
Investment securities			965,960		689,132	[1]
Loans			5,254,780		3,077,656
Allowance for loan losses			(12,142)		(9,769)	[1]
Other real estate			31,726		15,346	[1]
Deferred tax asset, net			62,303		55,607	[1]
Other assets			95,887		53,032	[1]
Total assets			7,351,080		4,474,144	[1]
Liabilities:
Deposits			5,310,028		3,310,297	[1]
Short-term borrowings			791,721		375,500	[1]
Long-term debt			164,215		194,967	[1]
Total liabilities			6,336,973		3,911,595	[1]
Goodwill			339,549		$ 152,152	[1]
Fair Value, Adjustment Disclosure [Abstract]
Accretion of acquisition discount on purchased loans			$ (21,259)	$ (18,899)
NewBridge Bancorp
Assets:
Cash and cash equivalents		$ 45,143
Investment securities		442,696
Loans		2,061,136
Allowance for loan losses		0
Loans held for sale		13,661
Federal Home Loan Bank stock, at cost		21,577
Premises and equipment, net		48,033
Bank owned life insurance		61,747
Other real estate		1,186
Deferred tax asset, net		23,735
Other intangibles, net		19,890
Other assets		39,965
Total assets		2,778,769
Liabilities:
Deposits		1,990,109
Short-term borrowings		472,335
Long-term debt		31,724
Other liabilities		40,662
Total liabilities		2,534,830
Net assets acquired		243,939
Purchase price		431,336
Goodwill	[2]	187,397
NewBridge Bancorp | As Reported by NewBridge
Assets:
Cash and cash equivalents		45,143
Investment securities		443,535
Loans		2,087,331
Allowance for loan losses		(21,100)
Loans held for sale		13,661
Federal Home Loan Bank stock, at cost		21,577
Premises and equipment, net		43,408
Bank owned life insurance		61,747
Other real estate		1,241
Deferred tax asset, net		30,014
Other intangibles, net		3,506
Other assets		40,375
Total assets		2,770,438
Liabilities:
Deposits		1,990,247
Short-term borrowings		471,800
Long-term debt		41,049
Other liabilities		34,461
Total liabilities		2,537,557
Net assets acquired		232,881
Fair Value, Adjustment Disclosure [Abstract]
Accretion of acquisition discount on purchased loans		(9,844)
NewBridge Bancorp | Initial Fair Value Adjustments
Assets:
Cash and cash equivalents		0
Investment securities	[3]	(1,948)
Loans	[4]	(26,195)
Allowance for loan losses	[5]	21,100
Loans held for sale		0
Federal Home Loan Bank stock, at cost		0
Premises and equipment, net	[6]	4,371
Bank owned life insurance		0
Other real estate		0
Deferred tax asset, net	[7]	(3,490)
Other intangibles, net	[8]	16,384
Other assets	[9]	(271)
Total assets		9,951
Liabilities:
Deposits	[10]	(138)
Short-term borrowings	[11]	535
Long-term debt	[12]	(9,325)
Other liabilities	[13]	5,983
Total liabilities		(2,945)
Net assets acquired		12,896
Fair Value, Adjustment Disclosure [Abstract]
Accretion of acquisition discount on purchased loans		(32,589)
Deferred loans fees		(3,450)
NewBridge Bancorp | Measurement Period Adjustments
Assets:
Cash and cash equivalents		0
Investment securities	[14]	1,109
Loans		0
Allowance for loan losses		0
Loans held for sale		0
Federal Home Loan Bank stock, at cost		0
Premises and equipment, net	[15]	254
Bank owned life insurance		0
Other real estate	[16]	(55)
Deferred tax asset, net	[17]	(2,789)
Other intangibles, net		0
Other assets	[18]	(139)
Total assets		(1,620)
Liabilities:
Deposits		0
Short-term borrowings		0
Long-term debt		0
Other liabilities	[19]	218
Total liabilities		218
Net assets acquired		$ (1,838)

[1] Derived from the audited consolidated financial statements included in the Company's 2015 Annual Report on Form 10-K.

[2] Goodwill represents the excess of the purchase price over the fair value of acquired net assets.

[3] Adjustment reflects opening fair value of securities portfolio, which was established as the new book basis of the portfolio.

[4] Adjustment reflects fair value discount of $32,589 on the loan portfolio, reversal of $3,450 in net deferred loan costs, and reversal of $9,844 in previously-existing fair value discount recognized by NewBridge in prior acquisitions. The fair value discount was calculated by forecasting cash flows over the expected remaining life of each loan and discounting those cash flows to present value using current market rates for similar loans. Forecasted cash flows include an estimate of lifetime credit losses on the loan portfolio.

[5] Adjustment reflects the elimination of NewBridge's historical allowance for loan losses of $21,100

[6] Adjustment reflects fair value adjustments on acquired branch and administrative offices.

[7] Adjustment reflects the tax impact of acquisition accounting fair value adjustments.

[8] Adjustment reflects the fair value of the acquired core deposit intangible, net of the reversal of core deposit intangible recorded by NewBridge in prior acquisitions.

[9] Adjustment reflects the impact of fair value adjustments on other assets, which include adjustments related to the elimination of accrued interest on purchased credit-impaired loans, recognition of a servicing asset related to U.S. Small Business Association ("SBA") loans, and termination of certain derivative contracts.

[10] Adjustment reflects the fair value premium on time deposits, which was calculated by discounting future contractual interest payments at a current market interest rate.

[11] Adjustments reflect the fair value adjustments for a short-term repurchase obligation and Federal Home Loan Bank ("FHLB") advances. The repurchase obligation was valued by discounting future contractual interest payments at a current market interest rate for a similar instrument. For FHLB advances, the fair value was calculated by reference to the acquisition date prepayment penalty the FHLB would charge to terminate the advance.

[12] Adjustments reflect fair value adjustments for subordinated debt obligations and junior subordinated debentures related to trust preferred securities outstanding at the acquisition date.

[13] Adjustments reflect compensation obligations, reserve for unfunded commitments, benefit costs for merger-related obligations, and miscellaneous other accrued liabilities.

[14] Adjustment to initial fair value of investment securities.

[15] Adjustments to initial fair values of premises and equipment

[16] Adjustment to initial fair value of other real estate.

[17] Deferred tax adjustment resulting from adjustments (l), (m), (n), (p) and (q)

[18] Adjustment to initial fair value of accrued interest receivable.

[19] Adjustment to initial fair value of accrued liabilities.