Consolidated Statements of Changes in Stockholders Equity (Unaudited) (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Common stock transactions:
Common shares purchased and retired, shares	14,112	246,596
Common shares issued, shares	14,692	11,506,503
Non-vested common shares issued, shares	130,904	117,140
Non-vested common shares forfeited, shares	17,544	3,548
Stock options exercised, shares	50,287	80,262
Shares tendered in payment of option price and income tax withholding amounts, shares	106,185	67,110
Cash dividends declared:
Common	$ 0.225	$ 0.225
Preferred	$ 0.0675	$ 0.0675
Common stock
Common stock transactions:
Common shares purchased and retired, shares	14,112	246,596
Common shares issued, shares	14,692	11,506,503
Non-vested common shares issued, shares	130,904	117,140
Non-vested common shares forfeited, shares	17,544	3,548
Stock options exercised, shares	50,287	80,262
Shares tendered in payment of option price and income tax withholding amounts, shares	106,185	67,110
Retained earnings
Cash dividends declared:
Common	$ 0.225	$ 0.225
Preferred	$ 0.0675	$ 0.0675