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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
M
entity
segment
D
component
subsidiary
Dec. 31, 2010
Dec. 31, 2009
Summary of Significant Accounting Policies      
Number of insurance-related subsidiaries 2    
Investment Securities      
Number of components in which other-than-temporary impairment is segregated 2    
Non-Accrual Loans      
Period of charge off for past due unsecured commercial loans (in days) 90    
Minimum period that past due unsecured loans outstanding may not be placed on nonaccrual status under special circumstances (in days) 90    
Maximum period of non-consumer loans outstanding that is used to evaluate whether loans should be placed on non-accrual status (in days) 90    
Other Real Estate Owned      
Other real estate owned $ 86,626 $ 87,192  
Income Taxes      
Percentage of likelihood of realization of recognized tax benefit 50.00%    
Consolidated Statements of Cash Flows      
Maximum term of maturity to classify short term investments as cash equivalents (in months) 3    
Segments of an Enterprise and Related Information      
Number of operating segments 1    
Number of active operating bank subsidiaries 4    
Reclassifications      
Decrease in cash provided by operating activities due to reclassification adjustment 181,896 178,155 182,709
Increase in cash provided by investing activities due to reclassification adjustment 206,060 (255,443) 638,210
Cash flow adjustment | Adjustment
      
Reclassifications      
Decrease in cash provided by operating activities due to reclassification adjustment     (84,800)
Increase in cash provided by investing activities due to reclassification adjustment     $ 84,800