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Summary of Carrying Values, Estimated Fair Values and Fair Value Measurement Levels of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Financial Assets:        
Cash and cash equivalents $ 984,296 $ 557,850 $ 650,880 $ 537,674
Securities held to maturity 3,642,104 3,712,776 [1]    
FHLB stock [2] 577,943 590,934    
Loans, net 38,973,215 39,308,016    
Financial Liabilities:        
Deposits 28,726,546 28,887,903    
Borrowed funds 13,213,452 13,673,379    
Financial Assets:        
Cash and cash equivalents 984,296 557,850    
Securities held to maturity 3,750,049 3,813,959 [1]    
FHLB stock [2] 577,943 590,934    
Loans, net 39,177,036 39,416,469    
Financial Liabilities:        
Deposits 28,718,398 28,888,064    
Borrowed funds 13,163,397 13,633,943    
Quoted Prices in Active Markets for Identical Assets (Level 1)        
Financial Assets:        
Cash and cash equivalents 984,296 557,850    
Securities held to maturity 200,055 200,220    
Financial Liabilities:        
Deposits [3] 21,164,339 21,310,733    
Significant Other Observable Inputs (Level 2)        
Financial Assets:        
Securities held to maturity 3,549,994 3,613,739    
FHLB stock [2] 577,943 590,934    
Financial Liabilities:        
Deposits [4] 7,554,059 7,577,331    
Borrowed funds 13,163,397 13,633,943    
Significant Unobservable Inputs (Level 3)        
Financial Assets:        
Loans, net $ 39,177,036 $ 39,416,469    
[1] Held-to-maturity securities are reported at a carrying amount equal to amortized cost less the non-credit portion of OTTI recorded in AOCL. At December 31, 2016, the non-credit portion of OTTI recorded in AOCL was $8.6 million (before taxes).
[2] Carrying value and estimated fair value are at cost.
[3] NOW and money market accounts, savings accounts, and non-interest-bearing accounts.
[4] Certificates of deposit.