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Capital Ratios (Details) (USD $)
1 Months Ended 6 Months Ended
Mar. 31, 2009
Mar. 31, 2005
Jun. 30, 2011
Dec. 31, 2010
Dec. 31, 2009
Capital Ratios          
Tier 1 capital to average total asset (leverage) ratio (as a percent)     11.79% 11.58%  
Risk-weighted Tier 1 capital ratio (as a percent)     21.23% 19.47%  
Risk-weighted total capital ratio (as a percent)     22.48% 20.72%  
Identified intangibles and goodwill     $ 297,237,000    
Percentage of capital securities issued by trust qualifying as Tier I capital, maximum (as a percent)     25.00%    
Capital securities issued by the trust, qualifying as Tier I capital     190,726,000 201,117,000  
Length of transition period under final rule of Federal Reserve Board (in years)   5      
Percentage of trust preferred securities and certain other capital elements to Tier 1 capital, maximum (as a percent)     25.00%    
Percentage of trust preferred securities to tier 1 capital for bank holding companies with significant international operations, maximum limit expected (as a percent)     15.00%    
Percentage of convertible preferred securities to Tier 1 capital elements related to bank holding companies with significant international operations, maximum (as a percent)     25.00%    
Extended transition period under the final rule of the Federal Reserve Board (in years) 2        
Consolidated assets required for the application of Collins amendment, minimum         $ 15,000,000,000