Unaudited Consolidated Statements of Changes in Shareholders’ Equity (Parentheticals) (USD $)	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Preferred stock dividends, per share	$ 12.50	$ 12.50

Aggregate dividends declared during the period for each share of preferred stock outstanding.

No definition available.

Name:	us-gaap_PreferredStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration