Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) (USD $)	3 Months Ended					6 Months Ended	3 Months Ended			6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2011 Series A Preferred Stock [Member] Parent [Member]	Jun. 30, 2010 Series A Preferred Stock [Member] Parent [Member]	Jun. 30, 2011 Series B Preferred Stock [Member] Parent [Member]	Jun. 30, 2010 Series B Preferred Stock [Member] Parent [Member]	Jun. 30, 2011 Parent [Member]	Jun. 30, 2011 Parent [Member]	Jun. 30, 2010 Parent [Member] Series C Preferred Stock [Member]	Jun. 30, 2011 Series A Preferred Stock [Member] Retained Earnings [Member]	Jun. 30, 2010 Series A Preferred Stock [Member] Retained Earnings [Member]	Jun. 30, 2011 Series A Preferred Stock [Member] Retained Earnings [Member]	Jun. 30, 2010 Series A Preferred Stock [Member] Retained Earnings [Member]	Jun. 30, 2011 Series B Preferred Stock [Member] Retained Earnings [Member]	Jun. 30, 2010 Series B Preferred Stock [Member] Retained Earnings [Member]	Jun. 30, 2011 Series B Preferred Stock [Member] Retained Earnings [Member]	Jun. 30, 2010 Series B Preferred Stock [Member] Retained Earnings [Member]	Jun. 30, 2011 Retained Earnings [Member]	Jun. 30, 2011 Retained Earnings [Member]	Jun. 30, 2010 Retained Earnings [Member] Series C Preferred Stock [Member]	Jun. 30, 2010 Retained Earnings [Member] Series C Preferred Stock [Member]	Jun. 30, 2011 Series A Preferred Stock [Member]	Jun. 30, 2010 Series A Preferred Stock [Member]	Jun. 30, 2011 Series B Preferred Stock [Member]	Jun. 30, 2010 Series B Preferred Stock [Member]	Jun. 30, 2010 Series C Preferred Stock [Member]
Cash dividends:
Preferred stock, Dividends per preferred share	$ 0.87	$ 0.87	$ 0.26	$ 0.24			$ 18.13	$ 0.87	$ 0.87	$ 1.74	$ 1.74	$ 0.26	$ 0.24	$ 0.57	$ 0.48			$ 18.13	$ 36.25	$ 1.74	$ 1.74	$ 0.57	$ 0.48	$ 36.25
Dividends per common share					$ 0.10	$ 0.10										$ 0.10	$ 0.10