Accounting Policies - Summary of Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Basic earnings per share
Net income	$ 3,417	$ 5,311
Less: Preferred stock dividends and accretion of discount	31	146
Net income available to common shareholders	3,386	5,165
Weighted average common shares outstanding	8,630,966	8,617,466
Basic Earnings Per Share	$ 0.39	$ 0.60
Diluted earnings per share
Net income available to common shareholders	$ 3,386	$ 5,165
Weighted average common shares outstanding	8,630,966	8,617,466
Effect of dilutive securities:
Warrants	311,278	293,237
Weighted average shares outstanding	9,021,786	8,980,655
Diluted Earnings Per Share	$ 0.38	$ 0.58
Restricted Stock [Member]
Effect of dilutive securities:
Effect of dilutive securities	39,519	35,557
Stock Options [Member]
Effect of dilutive securities:
Effect of dilutive securities	40,023	34,395