Condensed Consolidated Statements Of Changes In Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Share data	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Condensed Consolidated Statements Of Changes In Stockholders' Equity [Abstract]
Unrealized holding gains arising during the period, tax	$ 5,751	$ 4,068
Reclassification adjustment for gains (losses) included in net income, tax	29	22
Other comprehensive income, tax	$ 5,542	$ 4,046
Issuance of common stock, shares		7,477,274
Dividends on common stock, per share	$ 0.21	$ 0.18
Issuance of common stock under dividend reinvestment plan, shares	18,135	21,833
Issuance of common stock under stock incentive plan, shares	6,450	4,541
Vesting of restricted stock under stock incentive plan, shares	12,243	21,573