Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) community Office segment shares	Dec. 31, 2016 USD ($) shares
Summary Of Significant Accounting Policies [Line Items]
Revenue Recognition Non-interest Income Revenue Streams Within Scope of New Standard		84.00%
Number of reportable segments (in segments) | segment		3
Number of banking offices (in offices) | Office		41
Number of retirement communities with banking and trust services (in communities) | community		14
Federal Reserve Bank stock		$ 14,600,000	$ 14,600,000
FHLB Stock		12,500,000	10,100,000
Other-than-temporary impairment of equity securities		$ 0	$ 0
Number of days loan or lease past due for nonaccrual of interest status		90 days
Property, Plant and Equipment, Useful Life, Conditional Cost		new buildings constructed on leased land, the estimated useful life is the lesser of twenty-five years (fifteen years if the cost is less than $750 thousand) or the initial term including anticipated renewable terms
Maximum stock issuable under Univest Dividend Reinvestment Plan | shares		1,968,750
Stock issued under Univest dividend reinvestment plan | shares		60,602	86,350
Shares available for future purchase under Univest dividend reinvestment plan | shares		317,283
Maximum stock issuable under employees stock purchase plan | shares		3,355,786
Nineteen Ninety Six Employee Stock Purchase Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Maximum stock issuable under employees stock purchase plan | shares		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 | shares		22,092	28,919
Shares available for future purchase under employee stock purchase plans | shares		655,173
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] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life		15 years
Threshold for useful life calculation		$ 750,000
Building [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life		25 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
Equity Securities [Member]
Summary Of Significant Accounting Policies [Line Items]
Equity Securities Available-for-Sale, Fair Value		$ 1,076,000	$ 915,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax		666,000
Available-For-Sale Securities, Accumulated Net Gain Net Of Taxes		$ 433,000
Scenario, Forecast [Member]
Summary Of Significant Accounting Policies [Line Items]
Reclassification of accumulated other comprehensive income to retained earnings	$ (3,900,000)
Accounting Standards Update 2016-01 updated to Accounting Standards Update 2018-02 [Member] | Scenario, Forecast [Member]
Summary Of Significant Accounting Policies [Line Items]
Reclassification of accumulated other comprehensive income to retained earnings	$ 93,000