Fair Value Disclosures - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended						6 Months Ended		6 Months Ended	12 Months Ended	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Fair Value Measured on Recurring Basis [Member]	Dec. 31, 2013 Fair Value Measured on Recurring Basis [Member]	Jun. 30, 2014 Loans Held For Sale [Member]	Jun. 30, 2014 Level 3 [Member] Fair Value Measured on Recurring Basis [Member]	Dec. 31, 2013 Level 3 [Member] Fair Value Measured on Recurring Basis [Member]	Jun. 30, 2014 Girard Partners [Member]	Jan. 27, 2014 Girard Partners [Member]	Jun. 30, 2014 Javers Group [Member]	Dec. 31, 2013 Javers Group [Member]	Jun. 30, 2014 John T. Fretz Insurance Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Potential cash payments from contingent consideration, minimum								$ 0				$ 0
Potential cash payments from contingent consideration, maximum								14,500,000				620,000
Potential cash payments from contingent consideration, period of measurement (in years)								5 years		3 years
Potential cash payments from contingent consideration, end date								Dec. 31, 2018		Jun. 30, 2015		Apr. 30, 2016
Remaining potential cash payments from contingent consideration, period of measurement (in years)												2 years
Reduction of other noninterest expense											959,000
Fair value of contingent consideration liability									5,500,000	0
Original potential cash payments from contingent consideration, minimum								0		0
Original potential cash payments from contingent consideration, maximum								14,500,000		1,700,000
Assets measured at fair value on a recurring basis			302,625,000	336,627,000		0	0
Credit card loans					8,400,000
Nonaccrual Loans and Leases	17,742,000	23,235,000			532,000
Valuation adjustments for loans held for sale	0	0
Carrying amount of impaired loans	52,400,000	58,300,000
Valuation allowance of impaired loans	1,144,000	2,963,000
Mortgage servicing rights valuation allowance	243,000	250,000
Mortgage servicing rights carrying amount	5,600,000	5,800,000
Goodwill impairment	0
Impairment of intangible assets	$ 0