Summary of Significant Accounting Policies (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Offices Communities	Dec. 31, 2011
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Number of days loan or lease past due for nonaccrual of interest status	90 days
Maximum stock issuable under Univest dividend reinvestment plan	1,968,750
Stock issued under Univest dividend reinvestment plan	103,807	106,827
Shares available for future purchase under Univest dividend reinvestment plan	730,742
Number of banking offices	32
Number of retirement communities with banking and trust services	12
Maturity period of interest-earning deposits with other Banks	Less than 3 months
Immaterial error correction adjustment transfer from other liabilities to shareholders equity	$ 3.7
1996 Employee Stock Purchase Plan [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Maximum stock issuable under employee stock purchase plan	984,375
Minimum employees contributions to the purchase plan	2.00%
Maximum employees contributions to the purchase plan	10.00%
Maximum discount from fair value to recognize compensation expense for employee stock purchase plan	5.00%
Stock issued under employee stock purchase plans	20,933	21,266
Shares available for future purchase under employee stock purchase plans	776,090
Building [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Premises and Equipment estimated useful lives	40 years
Building on Leased Land [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Premises and Equipment estimated useful lives	40 years
Estimated useful life	Lesser of forty years or the term of the lease
Land Improvements [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Premises and Equipment estimated useful lives	15 years
Estimated useful life	Fifteen years or the term of the lease
Maximum [Member] | Furniture, Fixtures and Equipment [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Premises and Equipment estimated useful lives	10 years
Maximum [Member] | Core Deposits and Other Intangible Assets [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Intangibles and other identified intangibles with finite useful lives	15 years
Maximum [Member] | Noncompete Agreements [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Intangibles and other identified intangibles with finite useful lives	5 years
Maximum [Member] | Customer related [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Intangibles and other identified intangibles with finite useful lives	12 years
Minimum [Member] | Furniture, Fixtures and Equipment [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Premises and Equipment estimated useful lives	3 years
Minimum [Member] | Noncompete Agreements [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Intangibles and other identified intangibles with finite useful lives	3 years
Minimum [Member] | Customer related [Member]
Summary of Significant Accounting Policies (Textual) [Abstract]
Intangibles and other identified intangibles with finite useful lives	5 years