Consolidated Statements of Changes in Equity and Comprehensive Income (Parentheticals) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash dividends per share preferred stock	$ 12.50	$ 12.50
Cash dividends per share common stock	$ 0.10	$ 0.10
Shares of common stock purchased	19,805	48,215
Shares of common stock issued	21,554	41,388