Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) segment Office community shares	Dec. 31, 2015 USD ($) shares
Summary Of Significant Accounting Policies [Line Items]
Number of reportable segments (in segments) | segment	3
Number of banking offices (in offices) | Office	37
Number of retirement communities with banking and trust services (in communities) | community	14
Federal Reserve Bank stock | $	$ 14,600,000	$ 6,600,000
FHLB Stock | $	10,100,000	2,200,000
Other-than-temporary impairment of equity securities | $	$ 0	$ 0
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	86,350	87,946
Shares available for future purchase under Univest dividend reinvestment plan	377,885
Maximum stock issuable under employees stock purchase plan	3,355,786
Excess tax benefit | $	$ 301,000	$ 73,000
Nineteen Ninety Six Employee Stock Purchase Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Maximum stock issuable under employees stock purchase plan	984,375
Minimum employees contributions to the purchase plan	2.00%
Maximum employees contributions to the purchase plan	10.00%
Employee Stock Purchase Plan, Percentage of Purchase Price of Stock Based on closing price on Last Trading Day of Each Quarter End	90.00%
Maximum discount from fair value to recognize compensation expense for employee stock purchase plan	5.00%
Stock issued under employee stock purchase plans	28,919	26,440
Shares available for future purchase under employee stock purchase plans	677,265
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Period Optioned Shares Begin To Become Exercisable	3 years
Minimum [Member] | Customer Related [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangibles and other identified intangibles with finite useful lives	5 years
Minimum [Member] | Noncompete Agreements [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangibles and other identified intangibles with finite useful lives	3 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Period Optioned Shares Begin To Become Exercisable	10 years
Maximum [Member] | Core Deposits and Other Intangible Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangibles and other identified intangibles with finite useful lives	15 years
Maximum [Member] | Customer Related [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangibles and other identified intangibles with finite useful lives	12 years
Maximum [Member] | Noncompete Agreements [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangibles and other identified intangibles with finite useful lives	5 years
Building [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	40 years
Building [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	40 years
Land Improvements [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	15 years
Furniture, Fixtures and Equipment [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	3 years
Furniture, Fixtures and Equipment [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	10 years
Restricted Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Period Optioned Shares Begin To Become Exercisable	3 years