Subsequent Event - Narrative (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 01, 2015
Business Acquisition [Line Items]
Common stock, par value	$ 5	$ 5
Business Acquisition, Transaction Costs	$ 1,270,000	$ 87,000	$ 36,000
Subsequent Event [Member] | Valley Green Bank [Member]
Business Acquisition [Line Items]
Exchange ratio				135.41%
Univest shares issued				3,787,866
Business Combination, Employee Stock Options Outstanding Prior to Exchange				122,377
Business Combination, Employee Stock Options, Payroll Tax Expense				2,200,000
Purchase price assigned to cash in lieu of fractional shares				3,000
Loans Receivable, Fair Value Disclosure				381,500,000
Business Combination, Financing Receivable, Fair Value Disclosure, Premium				4,300,000
Business Combination, Financing Receivable, Fair Value Disclosure, Discount				5,800,000
Business Combination, Fair Value Adjustment, Period of Amortization				10 years
Business Combination, Impaired Financing Receivable				1,400,000
Business Combination, Impaired Financing Receivable, Related Allowance				2,848,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield				291,000
Core deposit intangible				1,867,000
Finite-Lived Intangible Asset, Useful Life				10 years
Business Combination, Deposits, Fair Value Disclosure, Premium				686,000
Business Acquisition, Transaction Costs				$ 1,200,000