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Summary of Carrying Values, Estimated Fair Values and Fair Value Measurement Levels of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Financial Assets:        
Cash and cash equivalents $ 1,129,846 $ 557,850 $ 674,289 $ 537,674
Securities held to maturity [1]   3,712,776    
FHLB stock [2] 589,067 590,934    
Loans, net 38,900,080 39,308,016    
Financial Liabilities:        
Deposits 28,893,565 28,887,903    
Borrowed funds 12,363,526 13,673,379    
Financial Assets:        
Cash and cash equivalents 1,129,846 557,850    
Securities held to maturity [1]   3,813,959    
FHLB stock [2] 589,067 590,934    
Loans, net 39,226,420 39,416,469    
Financial Liabilities:        
Deposits 28,879,234 28,888,064    
Borrowed funds 12,327,278 13,633,943    
Quoted Prices in Active Markets for Identical Assets (Level 1)        
Financial Assets:        
Cash and cash equivalents 1,129,846 557,850    
Securities held to maturity   200,220    
Financial Liabilities:        
Deposits [3] 20,662,712 21,310,733    
Significant Other Observable Inputs (Level 2)        
Financial Assets:        
Securities held to maturity   3,613,739    
FHLB stock [2] 589,067 590,934    
Financial Liabilities:        
Deposits [4] 8,216,522 7,577,331    
Borrowed funds 12,327,278 13,633,943    
Significant Unobservable Inputs (Level 3)        
Financial Assets:        
Loans, net $ 39,226,420 $ 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.