Acquisitions - Additional Information (Detail) (USD $)			6 Months Ended			6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Valley Green Bank [Member] Office	Jun. 17, 2014 Valley Green Bank [Member]	Mar. 31, 2014 Valley Green Bank [Member]	Jun. 30, 2014 Girard Partners [Member]	Jan. 27, 2014 Girard Partners [Member]
Business Acquisition [Line Items]
Business merger, Date of merger agreement			Jun. 17, 2014
Merger agreement aggregate value				$ 76,000,000
Assets	2,197,252,000	2,191,559,000			370,000,000
Loan					329,000,000
Deposits	1,832,234,000	1,844,498,000			335,000,000
Number of banking office operates in greater Philadelphia marketplace			3
Number of loan production offices in Philadelphia marketplace			2
Common stock per share received under Merger Agreement			$ 27.00
Number of consecutive trading days taken for final exchange ratio			20 days
Assets under management, Carrying amount	3,000,000,000						500,000,000
Acquisition completion date						Jan. 27, 2014
Cash paid for acquisition						5,400,000
Effective date of acquisition						Jan. 01, 2014
Fair value of contingent consideration liability							5,500,000
Original potential cash payments from contingent consideration, minimum						0
Original potential cash payments from contingent consideration, maximum						14,500,000
Potential cash payments from contingent consideration, period of measurement (in years)						5 years
Potential cash payments from contingent consideration, end date						Dec. 31, 2018
Goodwill related to acquisition, tax deductible						6,800,000
Customer related intangibles						$ 4,300,000
Customer related intangibles amortized period						9 years