Earnings Per Share, Accumulated Other Comprehensive Loss, Dividend Restrictions and Other Regulatory Matters (Detail) - Schedule of components for basic and diluted earnings per common share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income	$ 5,253	$ 1,739
Preferred stock dividends	813	813
Accretion on preferred stock discount	165	156
Net income available to common shareholders	$ 4,275	$ 770
Weighted average basic shares (in Shares)	16,529	16,527
Effect of dilutive stock options (in Shares)	18	1
Weighted average dilutive shares (in Shares)	16,547	16,528
Net income per common share
Basic (in Dollars per share)	$ 0.26	$ 0.05
Diluted (in Dollars per share)	$ 0.26	$ 0.05