Common Stock Issuance - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended
	Mar. 26, 2010	Dec. 31, 2010	Jun. 30, 2011
Schedule Of Common Stock [Line Items]
Common stock subscriptions	14,706,247
Common stock, subscription price	$ 1.75
Common stock purchased by standby investors	2,436,610
Common stock, subscription price	$ 1.75
Proceeds from issuance of common stock	$ 27,964,015
Capital contributed by bank to improve its regulatory position	20,000,000
Company contributed an additional amount to the capital		$ 4,000,000
Bank's Tier 1 (core) capital ratio			8.74%
Total risk-based capital			13.10%