Consolidated Statement of Changes in Shareholders Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Common stock per share dividend amount	$ 2.10	$ 2.10
Preferred stock [Member]
Shares of common stock issued upon conversion of Series B preferred stock		433,144
Common stock [Member]
Shares of common stock issued upon conversion of Series B preferred stock		433,144
Additional paid-in capital [Member]
Shares of common stock issued upon conversion of Series B preferred stock		433,144
Retained earnings [Member]
Common stock per share dividend amount	$ 2.10	$ 2.10
Treasury stock [Member]
Shares of common stock issued upon conversion of Series B preferred stock		433,144