The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 27, 2014	Jul. 01, 2014
Goodwill And Other Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 3,300,000us-gaap_AmortizationOfIntangibleAssets	$ 2,300,000us-gaap_AmortizationOfIntangibleAssets	$ 2,400,000us-gaap_AmortizationOfIntangibleAssets
Goodwill	67,717,000us-gaap_Goodwill	57,517,000us-gaap_Goodwill	56,238,000us-gaap_Goodwill
Additional goodwill	10,200,000us-gaap_GoodwillAcquiredDuringPeriod	1,279,000us-gaap_GoodwillAcquiredDuringPeriod
Goodwill impairment	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Material impairment to identifiable intangibles	0	0	0
Aggregate fair value of mortgage servicing rights	6,900,000	7,200,000
Minimum [Member]
Goodwill And Other Intangible Assets [Line Items]
Range of discount rates used for valuation of mortgage servicing rights	10.00%	5.00%
Maximum [Member]
Goodwill And Other Intangible Assets [Line Items]
Range of discount rates used for valuation of mortgage servicing rights		10.00%
Girard Partners [Member]
Goodwill And Other Intangible Assets [Line Items]
Additional goodwill				6,800,000
Sterner Insurance Associates Inc [Member]
Goodwill And Other Intangible Assets [Line Items]
Additional goodwill					3,400,000
Customer Related Intangibles [Member]
Goodwill And Other Intangible Assets [Line Items]
Impairment on customer related intangibles	31,000	83,000	31,000
Customer-Related Intangible Assets [Member] \| Girard Partners [Member]
Goodwill And Other Intangible Assets [Line Items]
Customer related intangibles				4,300,000
Customer-Related Intangible Assets [Member] \| Sterner Insurance Associates Inc [Member]
Goodwill And Other Intangible Assets [Line Items]
Customer related intangibles					$ 1,600,000