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Fair Value Of Financial Instruments (Schedule Of Estimated Fair Value Of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities $ 9,020,951 $ 9,224,702
Trading securities 13,595 17,853
Non-marketable 117,540 115,832
Securities purchased under agreements to resell 850,000 850,000
Interest earning deposits with banks 132,144 39,853
Cash and due from banks 426,742 465,828
Non-interest bearing deposits 5,814,932 5,377,549
Savings, interest checking and money market deposits 9,025,688 8,933,941
Other borrowings 103,744 111,817
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 13,595 17,853
Derivative Assets 18,853 [1] 21,502 [1]
Derivative instruments 19,691 [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 176 [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 386,750 384,963
Federal funds sold 10,475 11,870
Interest earning deposits with banks 132,144 39,853
Cash and due from banks 426,742 465,828
Non-interest bearing deposits 5,814,932 5,377,549
Savings, interest checking and money market deposits 9,025,688 8,933,941
Federal Funds Purchased 207,975 153,330
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 2,909 24,394
Available for sale securities 8,506,470 8,704,118
Trading securities 13,595 17,853
Derivative Assets 18,853 21,502
Derivative instruments 19,691 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 5,832 6,682
Available for sale securities 127,731 135,621
Non-marketable 117,540 115,832
Securities purchased under agreements to resell 850,000 850,000
Derivative Assets 10 35
Time open and certificates of deposits 2,009,010 2,488,393
Securities sold under agreements to repurchase 1,049,974 1,102,751
Other borrowings 103,744 111,817
Derivative instruments 176 158
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 3,098,908 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 335,113 386,598
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 2,193,206 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 1,556,754 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 1,243,400 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 453,527 463,587
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 748,885 788,701
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 8,852 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 386,750 384,963
Federal funds sold 10,475 11,870
Interest earning deposits with banks 132,144 39,853
Cash and due from banks 426,742 465,828
Non-interest bearing deposits 5,814,932 5,377,549
Savings, interest checking and money market deposits 9,025,688 8,933,941
Federal Funds Purchased 207,975 153,330
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 2,920 26,597
Available for sale securities 8,506,470 8,704,118
Trading securities 13,595 17,853
Derivative Assets 18,853 21,502
Derivative instruments 19,691 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 5,832 6,682
Available for sale securities 127,731 135,621
Non-marketable 117,540 115,832
Securities purchased under agreements to resell 869,003 864,089
Derivative Assets 10 35
Time open and certificates of deposits 2,019,699 2,493,727
Securities sold under agreements to repurchase 1,047,899 1,099,883
Other borrowings 118,512 126,397
Derivative instruments 176 158
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 3,114,822 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 337,794 388,723
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 2,224,323 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 1,606,018 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 1,268,928 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 461,776 471,086
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 757,702 780,808
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 $ 8,852 $ 6,561
[1] The fair value of each class of derivative is shown in Note 10