Premises and Equipment - Summary of Premises and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Property Plant And Equipment Net By Type [Abstract]
Land & land improvements	$ 5,956	$ 5,975
Buildings	30,025	30,103
Furniture and equipment	28,223	27,881
Premises and equipment, gross	64,204	63,959
Less: Accumulated depreciation	(32,423)	(32,397)
Premises and equipment less depreciation, gross	31,781	31,562
Construction in progress	99	50
Total premises and equipment	$ 31,880	$ 31,612