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Fair Value of Financial Instruments - Carrying value and estimated fair value (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Assets:        
Cash and cash equivalents $ 3,959,932 $ 3,251,786 $ 5,369,694 $ 4,496,828
Investment securities held to maturity 1,158,785 1,203,217    
Investment securities held to maturity, estimated fair value 1,142,694 1,182,009    
Liabilities:        
Deposits 67,529,638 67,279,533    
Federal funds purchased and securities sold under agreements to repurchase 71,559 39,052    
Other short-term borrowings 2,642,539 2,802,977    
Fair Value, Inputs, Level 1        
Assets:        
Cash and cash equivalents, estimated fair value 3,959,932 3,251,786    
Fair Value, Inputs, Level 2        
Liabilities:        
Deposits, estimated fair value 67,603,537 67,359,299    
FHLB and other borrowings, estimated fair value 3,037,339 3,001,836    
Federal funds purchased and securities sold under agreements to repurchase, estimated fair value 71,559 39,052    
Other short-term borrowings, estimated fair value 50,000 50,000    
Fair Value, Inputs, Level 3        
Assets:        
Investment securities held to maturity, estimated fair value 1,142,694 1,182,009    
Loans, net, estimated fair value 56,219,932 56,283,761    
Reported value measurement        
Assets:        
Cash and cash equivalents 3,959,932 3,251,786    
Investment securities held to maturity 1,158,785 1,203,217    
Loans, net 58,871,661 59,222,970    
Liabilities:        
Deposits 67,529,638 67,279,533    
FHLB and other borrowings 2,993,222 3,001,551    
Federal funds purchased and securities sold under agreements to repurchase 71,559 39,052    
Other short-term borrowings 50,000 50,000    
Estimate of fair value measurement        
Assets:        
Cash and cash equivalents, estimated fair value 3,959,932 3,251,786    
Investment securities held to maturity, estimated fair value 1,142,694 1,182,009    
Loans, net, estimated fair value 56,219,932 56,283,761    
Liabilities:        
Deposits, estimated fair value 67,603,537 67,359,299    
FHLB and other borrowings, estimated fair value 3,037,339 3,001,836    
Federal funds purchased and securities sold under agreements to repurchase, estimated fair value 71,559 39,052    
Other short-term borrowings, estimated fair value $ 50,000 $ 50,000