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Junior Subordinated Interest Deferrable Debentures (Details) (USD $)
 6 Months Ended 1 Months Ended
Jun. 30, 2012
quarter
trust
Dec. 31, 2011
Jul. 31, 2011
Trust I
Jun. 30, 2011
Trust I
Junior Subordinated Interest Deferrable Debentures        
Number of statutory business trusts issuing trust preferred securities 8      
Junior subordinated deferrable interest debentures $ 190,726,000 $ 190,726,000    
Maximum number of consecutive quarterly period available for deferral of interest payment on Trusts VI, VII, VIII, IX, X, XI and XII 20      
Percentage of capital securities issued by trust qualifying as Tier I capital, maximum 25.00%      
Capital securities issued by the trust, qualifying as Tier I capital $ 190,726,000 $ 190,726,000    
Junior subordinated deferrable interest debentures, major types of business trusts        
Securities redeemed     One half One half