Subsequent Event - Summary of Consideration Paid (Details) (Valley Green Bank [Member], USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended
	Jan. 01, 2015	Dec. 31, 2014
Purchase price consideration in common stock:
Univest closing stock price at December 31, 2014		$ 20.24
Subsequent Event [Member]
Purchase price consideration in common stock:
Valley Green common shares outstanding	2,797,454
Exchange ratio	135.41%
Univest shares issued	3,787,866
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	382,892
Premises and equipment, net	3,102
Core deposit intangible	1,867
Accrued interest receivable and other assets	3,779
Total identifiable assets	426,767
Fair value of liabilities assumed:
Deposits - noninterest bearing	49,826
Deposits - interest bearing	336,086
Change in control accrued payments	2,070
Accrued interest payable and other liabilities	1,792
Total liabilities	389,774
Net identifiable net assets	36,993
Goodwill resulting from merger	$ 41,913