Segment Information - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014 Segment Office
Segment Reporting Information [Line Items]
Number of businesses	3
Number of offices	55
Cypress Capital Management, LLC [Member]
Segment Reporting Information [Line Items]
Assets under management	661,000,000
Christiana Trust [Member]
Segment Reporting Information [Line Items]
Assets under administration	8,600,000,000
Delaware [Member]
Segment Reporting Information [Line Items]
Number of offices	45
Pennsylvania [Member]
Segment Reporting Information [Line Items]
Number of offices	8
Virginia [Member]
Segment Reporting Information [Line Items]
Number of offices	1
Nevada [Member]
Segment Reporting Information [Line Items]
Number of offices	1
WSFS Bank [Member]
Segment Reporting Information [Line Items]
Number of businesses	1
Cash Connect [Member]
Segment Reporting Information [Line Items]
Number of businesses	1
Trust & Wealth Management [Member]
Segment Reporting Information [Line Items]
Number of businesses	1
Number of business lines	4