Condensed Consolidated Statements of Changes In Stockholders' Equity (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Common stock dividends, per share	$ 0.34	$ 0.24
Acquisition of CommerceFirst Bancorp, Inc., shares	732,054
Stock option plan, shares	(1,217)	1,765
Employee stock purchase plan, shares	24,295	24,121
Director stock purchase plan, shares	1,083	1,833
Restricted stock, shares	46,445	28,450
Repurchase of common stock, shares		23,592