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Fair Value (Fair Value Of Financial Instruments) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Dec. 31, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and money market instruments, Carrying value$ 272,097$ 133,780$ 133,586$ 159,091
Cash and money market instruments, Fair value272,097133,780  
Investment securities, Carrying value1,640,7391,971,092  
Investment securities, Fair value1,658,5321,983,636  
Accrued interest receivable, Carrying value21,99024,137  
Accrued interest receivable, Fair value21,99024,137  
Mortgage loans held for sale, Carrying value10,7788,340  
Mortgage loans held for sale, Fair value10,7788,340  
Impaired loans carried at fair value, Carrying value89,857111,257  
Impaired loans carried at fair value, Fair value89,857111,257  
Other loans, Carrying value4,479,6924,491,691  
Other loans, Fair value4,491,0854,511,419  
Net loans4,580,3274,611,288  
Loans receivable net, Fair value4,591,7204,631,016  
Noninterest bearing checking accounts, Carrying value1,000,969937,719  
Noninterest bearing checking accounts, Fair value1,000,969937,719  
Interest bearing transactions accounts, Carrying value1,432,8271,283,159  
Interest bearing transactions accounts, Fair value1,432,8271,283,159  
Savings accounts, Carrying value943,948899,288  
Savings accounts, Fair value943,948899,288  
Time deposits, Carrying value1,705,8441,973,903  
Time deposits, Fair value1,713,8881,990,163  
Other, Carrying value5,5991,351  
Other, Fair value5,5991,351  
Total deposits5,089,1875,095,420  
Total deposits , Fair value5,097,2315,111,680  
Short-term borrowings, Carrying value243,071663,669  
Short-term borrowings, Fair value243,071663,669  
Long-term debt, Carrying value823,722636,733  
Long-term debt, Fair value917,963699,080  
Subordinated debentures/notes, Carrying value75,25075,250  
Subordinated debentures/notes, Fair value66,93463,099  
Accrued interest payable, Carrying value5,4166,123  
Accrued interest payable, Fair value5,4166,123  
Fair Value Swap [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swap, Carrying value1,0991,634  
Swap, Fair value1,0991,634  
Interest Rate Swap [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value swap, Carrying value20060  
Swap, Fair value$ 200$ 60