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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic earnings per share
Net income	$ 4,778	$ 5,665	$ 8,195	$ 10,976
Less: Preferred stock dividends and accretion of discount	32	96	63	242
Net income available to common shareholders	4,746	5,569	8,132	10,734
Weighted average common shares outstanding	9,182,986	8,617,466	8,908,492	8,617,466
Basic Earnings Per Share	$ 0.52	$ 0.65	$ 0.91	$ 1.25
Diluted earnings per share
Net income available to common shareholders	$ 4,746	$ 5,569	$ 8,132	$ 10,734
Weighted average common shares outstanding	9,182,986	8,617,466	8,908,492	8,617,466
Effect of dilutive securities:
Warrants	303,399	287,815	308,060	290,550
Weighted average shares outstanding	9,560,939	8,974,103	9,293,423	8,977,408
Diluted Earnings Per Share	$ 0.50	$ 0.62	$ 0.88	$ 1.20
Restricted Stock [Member]
Effect of dilutive securities:
Effect of dilutive securities	38,003	35,263	38,717	35,411
Stock Options [Member]
Effect of dilutive securities:
Effect of dilutive securities	36,551	33,559	38,154	33,981