Acquisition - Summary of Consideration Paid (Details) - Valley Green Bank [Member] - USD ($) $ / shares in Units, $ in Thousands	Jan. 01, 2015	Dec. 31, 2014
Purchase price consideration in common stock:
Valley Green common shares outstanding	2,797,454
Exchange ratio	135.41%
Univest shares issued	3,787,866
Univest closing stock price at December 31, 2014		$ 20.24
Purchase price assigned to Valley Green common shares exchanged for Univest stock	$ 76,667
Purchase price assigned to cash in lieu of fractional shares	3
Purchase price assigned to Valley Green options settled for cash	2,236
Total purchase price	78,906
Fair value of assets acquired:
Cash and due from banks	4,919
Federal funds sold	17,442
Investment securities available-for-sale	12,766
Loans held for investment	381,106
Premises and equipment, net	2,973
Core deposit intangible	1,520
Accrued interest receivable and other assets	4,585
Total identifiable assets	425,311
Fair value of liabilities assumed:
Deposits - noninterest bearing	49,102
Deposits - interest bearing	336,810
Change in control accrued payments	2,070
Accrued interest payable and other liabilities	1,800
Total liabilities	389,782
Identifiable net assets	35,529
Goodwill resulting from merger	$ 43,377