Assumptions Used to Estimate Fair Value of Option Grant on Grant Date Using Black-Scholes-Merton Option Pricing Model (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of options granted	25,000	25,000
Grant date fair value	$ 1.29	$ 2.24
Stock Options Granted on June 8, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date	Jun. 08, 2009
Total number of options granted	121,940
Expected volatility	7.40%
Expected term	7 years
Expected dividend	0.00%
Risk-free rate	3.60%
Grant date fair value	$ 2.29
Stock Options Granted on February 23, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date	Feb. 23, 2011
Total number of options granted	25,000
Expected volatility	7.40%
Expected term	7 years
Expected dividend	0.00%
Risk-free rate	3.49%
Grant date fair value	$ 2.24
Stock Options Granted on March 20, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date	Mar. 20, 2012
Total number of options granted	25,000
Expected volatility	25.00%
Expected term	7 years
Expected dividend	0.00%
Risk-free rate	2.00%
Grant date fair value	$ 1.29

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References+ Details

Coastal Carolina Bancshares, Inc. 10-K