Acquisition - Additional Information (Detail) (John T. Fretz Insurance Agency, Inc. [Member], USD $)	9 Months Ended
	Sep. 30, 2013
Business Acquisition [Line Items]
Date of acquisition	May 01, 2013
Cash paid for acquisition	$ 2,200,000
Fair value of contingent consideration	454,000
Potential cash payments from contingent consideration, period of measurement (in years)	3 years
Goodwill	1,300,000
Goodwill related to acquisition, tax deductible	1,300,000
Customer related intangible assets [Member]
Business Acquisition [Line Items]
Customer related intangibles	1,300,000
Customer related intangibles amortized period	7 years
Minimum [Member]
Business Acquisition [Line Items]
Potential cash payments from contingent consideration	0
Maximum [Member]
Business Acquisition [Line Items]
Potential cash payments from contingent consideration	$ 930,000