Acquisition - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jul. 01, 2016	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Total assets		$ 4,230,528		$ 2,879,451
Loans		3,268,387		2,161,385
Deposits		3,257,567		2,394,360
Univest closing stock price at June 30, 2016			$ 21.02
Interest component of expected cash flows (accretable discount)		$ 50		$ 144	$ 0
Building [Member]
Business Acquisition [Line Items]
Estimated useful life		40 years
Fox Chase Bank [Member]
Business Acquisition [Line Items]
Total assets	$ 1,100,000
Loans	776,200
Deposits	738,300
Purchase price assigned to cash in lieu of fractional shares	$ 98,900
Univest shares issued	6,857,529
Total purchase price			$ 242,200
Univest closing stock price at June 30, 2016			$ 21.02
Fair value premium, investment securities	$ 3,400
Investment securities, estimated life	3 years 8 months 12 days
Loans portfolio without evidence of credit quality deterioration	$ 762,500
Fair value premium	4,700
Fair value discount	$ 8,500
Fair value adjustment, period of amortization	10 years
Fair value of loans acquired with a deterioration of credit quality	$ 13,738
Interest component of expected cash flows (accretable discount)	(283)
Contractual cash flows not expected to be collected (nonaccretable difference)	(11,120)
Unaccretable fair value discount on contractually required cash flows not expected to be collected principal and interest	5,700
Core deposit intangible	5,268
Deposits, fair value premium	(831)
Long term debt, fair value premium	(3,400)
Integration and acquisition-related costs, gross		$ 15,900
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	$ 59,902
Fox Chase Bank [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Core deposit intangible useful life	10 years
Fox Chase Bank [Member] | Building [Member]
Business Acquisition [Line Items]
Fair value, building	$ 4,400
Estimated useful life	30 years
Fox Chase Bank [Member] | Principal Owner [Member] | Acquired Shareholders [Member]
Business Acquisition [Line Items]
Post transaction, percent of outstanding shares held	26.00%