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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
item
Dec. 31, 2011
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 90 days  
Minimum period that past due unsecured loans outstanding may not be placed on nonaccrual status under special circumstances 90 days  
Maximum period of non-consumer loans outstanding that is used to evaluate whether loans should be placed on non-accrual status 90 days  
Other Real Estate Owned    
Other real estate owned $ 100,106 $ 86,626
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 3 months  
Segments of an Enterprise and Related Information    
Number of operating segments 1  
Number of active operating bank subsidiaries 4