Earnings Per Share (Details Textual) (USD $)	6 Months Ended
	Jun. 30, 2013
Fletcher International Ltd
Class of Stock [Line Items]
Exercise of price warrants	21.25
Shares issuable upon the exercise of warrants	1,411,765
Elm Ridge Parties
Class of Stock [Line Items]
Exercise of price warrants	12.50
Shares issuable upon the exercise of warrants	1,551,126
Series B - 5% fixed until December 6, 2013, 9% thereafter
Class of Stock [Line Items]
Exercise of price warrants	61.40
Shares issuable upon exercise of grants	219,909
Fixed percentage of dividend rate on preferred stock	5.00%
Future percentage of dividend rate on preferred stock	9.00%
Trust preferred securities
Class of Stock [Line Items]
Exercise of price warrants	100
United's Series B preferred stock issued	129,670
Employees
Class of Stock [Line Items]
Shares issuable upon exercise of grants	407,372
Weighted average exercise price of stock options granted to employees	$ 100.90
Restricted Stock
Class of Stock [Line Items]
Vesting of restricted stock awards	393,785
Series A - 6% fixed
Class of Stock [Line Items]
Fixed percentage of dividend rate on preferred stock	6.00%
Series D - LIBOR plus 9.6875%, resets quarterly
Class of Stock [Line Items]
LIBOR variable percentage of dividend rate on preferred stock	9.6875%