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Fair Value Of Financial Instruments (Schedule Of Estimated Fair Value Of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities $ 9,206,451 $ 9,224,702
Trading securities 14,313 17,853
Non-marketable 116,190 115,832
Securities purchased under agreements to resell 850,000 850,000
Interest earning deposits with banks 92,544 39,853
Cash and due from banks 410,666 465,828
Non-interest bearing deposits 5,637,373 5,377,549
Savings, interest checking and money market deposits 8,983,090 8,933,941
Other borrowings 111,292 111,817
Fair Value Hierarchy, Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0 0
Derivative Assets 0 [1] 0 [1]
Derivative instruments 0 [1] 0 [1]
Fair Value Hierarchy, Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 14,313 17,853
Derivative Assets 20,435 [1] 21,502 [1]
Derivative instruments 21,406 [1] 22,564 [1]
Fair Value Hierarchy, Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Trading securities 0 0
Derivative Assets 10 [1] 35 [1]
Derivative instruments 109 [1] 158 [1]
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 386,981 384,963
Federal funds sold 7,455 11,870
Interest earning deposits with banks 92,544 39,853
Cash and due from banks 410,666 465,828
Non-interest bearing deposits 5,637,373 5,377,549
Savings, interest checking and money market deposits 8,983,090 8,933,941
Federal Funds Purchased 340,300 153,330
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for sale 2,951 24,394
Available for sale securities 8,691,930 8,704,118
Trading securities 14,313 17,853
Derivative Assets 20,435 21,502
Derivative instruments 21,406 22,564
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for sale 5,923 6,682
Available for sale securities 127,540 135,621
Non-marketable 116,190 115,832
Securities purchased under agreements to resell 850,000 850,000
Derivative Assets 10 35
Time open and certificates of deposits 2,211,170 2,488,393
Securities sold under agreements to repurchase 965,445 1,102,751
Other borrowings 111,292 111,817
Derivative instruments 109 158
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Business [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,993,067 2,808,265
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Construction And Land [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 346,048 386,598
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Business [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,190,838 2,180,100
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Personal [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 1,501,170 1,428,777
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 1,162,532 1,114,889
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Revolving Home Equity [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 447,601 463,587
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer Credit Card [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 732,388 788,701
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Overdrafts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 3,271 6,561
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 386,981 384,963
Federal funds sold 7,455 11,870
Interest earning deposits with banks 92,544 39,853
Cash and due from banks 410,666 465,828
Non-interest bearing deposits 5,637,373 5,377,549
Savings, interest checking and money market deposits 8,983,090 8,933,941
Federal Funds Purchased 340,300 153,330
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for sale 2,963 26,597
Available for sale securities 8,691,930 8,704,118
Trading securities 14,313 17,853
Derivative Assets 20,435 21,502
Derivative instruments 21,406 22,564
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for sale 5,923 6,682
Available for sale securities 127,540 135,621
Non-marketable 116,190 115,832
Securities purchased under agreements to resell 862,845 864,089
Derivative Assets 10 35
Time open and certificates of deposits 2,219,940 2,493,727
Securities sold under agreements to repurchase 962,662 1,099,883
Other borrowings 125,682 126,397
Derivative instruments 109 158
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Business [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 3,008,375 2,820,005
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Construction And Land [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 348,939 388,723
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Business [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,217,772 2,197,535
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Personal [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 1,548,033 1,485,028
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 1,190,080 1,136,798
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Revolving Home Equity [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 455,194 471,086
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer Credit Card [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 747,630 780,808
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Overdrafts [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans $ 3,271 $ 6,561
[1] The fair value of each class of derivative is shown in Note 10