Earnings Per Share - Summary of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 3,090	$ 7,288
Weighted average shares outstanding-basic	29,016,774	29,001,374
Net income per share-basic	$ 0.11	$ 0.25
Net income	$ 3,921	$ 9,249
Weighted average shares outstanding-diluted	37,009,746	36,934,210
Net income per share-diluted	$ 0.11	$ 0.25