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Summary of Significant Accounting Policies (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Transfers and Servicing of Financial Assets    
Mortgage loans serviced for others $ 552.0 $ 458.7
Loans    
Period from due date after which accrual of interest income is discontinued 90 days  
Period of rolling quarterly adjustment on which actual loss history is based 5 years