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Fair Value (Estimated Fair Values of Financial Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities $ 2,149,466 $ 2,093,404
Held to maturity securities 2,518,371 2,370,388
Loans, net 15,760,330 15,522,135
Loans held for sale 24,001 20,434
Derivative financial instruments [1] 36,479 23,251
Deposits 18,656,150 18,348,912
Securities sold under agreements to repurchase 419,000  
Long-term debt 471,245 490,145
Derivative financial instruments [1] 36,336 23,968
Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash, interest-bearing bank deposits, and federal funds sold 442,650 869,429
Available for sale securities 2,762 2,757
Federal funds purchased 6,825 10,100
Securities sold under agreements to repurchase 418,962 513,544
FHLB borrowings 675,000 900,000
Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale securities 2,146,704 2,090,647
Held to maturity securities 2,566,799 2,375,851
Loans, net 179,627 93,602
Loans held for sale 24,001 20,434
Derivative financial instruments [1] 36,479 23,251
Long-term debt 476,530 488,711
Derivative financial instruments [1] 36,336 23,968
Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans, net 15,761,305 15,334,201
Deposits 18,651,845 18,327,425
Total Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash, interest-bearing bank deposits, and federal funds sold 442,650 869,429
Available for sale securities 2,149,466 2,093,404
Held to maturity securities 2,566,799 2,375,851
Loans, net 15,940,932 15,427,803
Loans held for sale 24,001 20,434
Derivative financial instruments 36,479 23,251
Deposits 18,651,845 18,327,425
Federal funds purchased 6,825 10,100
Securities sold under agreements to repurchase 418,962 513,544
FHLB borrowings 675,000 900,000
Long-term debt 476,530 488,711
Derivative financial instruments 36,336 23,968
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash, interest-bearing bank deposits, and federal funds sold 442,650 869,429
Available for sale securities 2,149,466 2,093,404
Held to maturity securities 2,518,371 2,370,388
Loans, net 15,760,330 15,522,135
Loans held for sale 24,001 20,434
Derivative financial instruments 36,479 23,251
Deposits 18,656,150 18,348,912
Federal funds purchased 6,825 10,100
Securities sold under agreements to repurchase 418,962 513,544
FHLB borrowings 675,000 900,000
Long-term debt 471,245 490,145
Derivative financial instruments $ 36,336 $ 23,968
[1] For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.