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Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
FHLB advances and long-term debt $ 1,040,149 $ 1,119,450
Short Term Financial Instruments [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Short Term Borrowings, Reprice Period, In Days 90  
Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Loans held for sale 47,009 [1] 83,940 [1]
Loans, net of unearned income 11,968,970 [1] 11,933,307 [1]
Accrued interest receivable 51,098 53,841
Short-term borrowings 597,033 674,077
Accrued interest payable 25,686 33,333
FHLB advances and long-term debt 1,040,149 1,119,450
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Cash [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 292,598 198,954
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Interest-bearing Deposits [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Interest-bearing deposits with other banks 175,336 33,297
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Held-to-maturity Securities [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Securities held to maturity 6,669 7,751
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Available-for-sale Securities [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Securities available for sale 2,673,298 [1] 2,853,733 [1]
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other Assets [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Other finanical assets 315,952 [1] 282,174 [1]
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Deposits [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Demand and savings deposits 8,511,789 7,758,613
Time deposits 4,013,950 4,629,968
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Other financial liabilities 69,816 [1] 80,250 [1]
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Loans held for sale 47,009 [1] 83,940 [1]
Loans, net of unearned income 11,992,586 [1] 11,909,539 [1]
Accrued interest receivable 51,098 53,841
Short-term borrowings 597,033 674,077
Accrued interest payable 25,686 33,333
FHLB advances and long-term debt 982,010 1,077,724
Estimate of Fair Value, Fair Value Disclosure [Member] | Cash [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 292,598 198,954
Estimate of Fair Value, Fair Value Disclosure [Member] | Interest-bearing Deposits [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Interest-bearing deposits with other banks 175,336 33,297
Estimate of Fair Value, Fair Value Disclosure [Member] | Held-to-maturity Securities [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Securities held to maturity 6,699 7,818
Estimate of Fair Value, Fair Value Disclosure [Member] | Available-for-sale Securities [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Securities available for sale 2,673,298 [1] 2,853,733 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Other Assets [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Other finanical assets 315,952 [1] 282,174 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Deposits [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Demand and savings deposits 8,511,789 7,758,613
Time deposits 4,056,247 4,677,494
Estimate of Fair Value, Fair Value Disclosure [Member] | Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member]
   
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Other financial liabilities $ 69,816 [1] $ 80,250 [1]
[1] )Description of fair value determinations for these financial instruments, or certain financial instruments within these categories, measured at fair value on the Corporation’s consolidated balance sheets, are disclosed abov