Stockholders' Equity And Earnings Per Share (Narrative) (Details) (USD $)	3 Months Ended								12 Months Ended				12 Months Ended				0 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 05, 2008	Dec. 31, 2011 Series A Non-Cumulative Preferred Stock [Member]	Dec. 31, 2010 Series A Non-Cumulative Preferred Stock [Member]	Dec. 31, 2009 Series A Non-Cumulative Preferred Stock [Member]	Dec. 05, 2008 Series B Preferred Stock [Member]	Dec. 05, 2008 Five Years [Member]	Dec. 05, 2008 Five Years [Member] Series B Preferred Stock [Member]	Dec. 05, 2008 Thereafter [Member]	Dec. 05, 2008 Thereafter [Member] Series B Preferred Stock [Member]	Dec. 31, 2011 Person Or Group Acquires [Member]	Dec. 31, 2011 Tender Offer [Member]
Stockholders' Equity And Earnings Per Share [Line Items]
Issuance of Series B preferred stock													$ 8,600,000
Dividends on preferred stock	4,114,000	4,111,000	4,107,000	4,105,000	4,102,000	4,098,000	4,096,000	4,092,000	16,437,000	16,388,000	16,338,000		605,000	611,000	611,000
Series A junior participating preferred stock price									$ 200
Preferred stock rights exercisable																					15.00%	15.00%
Preferred stock, shares	258,000				258,000				258,000	258,000						258,000
U.S. treasury purchased senior preferred stock	250,992,000				247,455,000				250,992,000	247,455,000		258,000,000				258,000,000
Senior preferred stock, cumulative compounding dividends rate													7.00%				5.00%	5.00%	9.00%	9.00%
Warrants to purchase, shares of common stock	1,846,374								1,846,374
Warrants exercise price	$ 20.96								$ 20.96
Warrants aggregate market price	38,700,000								38,700,000
Senior preferred stock									15.00%
Options to purchase additional shares	4,400,000				5,000,000				4,400,000	5,000,000
Warrants to purchase additional shares	1,800,000				1,800,000				1,800,000	1,800,000
Restricted stock units additional shares									103,000	39,000
Amount of retained earnings available for cash dividends									$ 55,300,000