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Derivative Financial Instruments Derivative Financial Instruments (Summary Amounts Included in Consolidated Statement of Income Related to Derivatives) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Interest Rate Swaps and Caps [Member] | Other Income [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Income related to derivative instruments not designated in hedge relationships $ (1,974) $ 42
Mortgage Banking Derivatives [Member] | Mortgage Banking Revenue [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Income related to derivative instruments not designated in hedge relationships 1,659 (1,301)
Call Options Written [Member] | Fees From Covered Call Options [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Income related to derivative instruments not designated in hedge relationships 10,476 13,570
Foreign Exchange Contract [Member] | Other Income [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Income related to derivative instruments not designated in hedge relationships $ 12 $ 0