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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, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Financial Assets:        
Cash and cash equivalents $ 650,880 $ 537,674 $ 582,558 $ 564,150
Securities held to maturity 4,068,750 [1] 5,969,390 [2]    
FHLB stock [3] 551,247 663,971    
Loans, net 38,453,936 38,011,995    
Financial Liabilities:        
Deposits 28,982,312 28,426,758    
Borrowed funds 13,344,772 15,748,405    
Financial Assets:        
Cash and cash equivalents 650,880 537,674    
Securities held to maturity 4,304,161 [1] 6,108,529 [2]    
FHLB stock [3] 551,247 663,971    
Loans, net 38,914,681 38,245,434    
Financial Liabilities:        
Deposits 28,986,770 28,408,915    
Borrowed funds 13,412,305 15,685,616    
Quoted Prices in Active Markets for Identical Assets (Level 1)        
Financial Assets:        
Cash and cash equivalents 650,880 537,674    
Financial Liabilities:        
Deposits [4] 22,193,600 23,114,271    
Significant Other Observable Inputs (Level 2)        
Financial Assets:        
Securities held to maturity 4,303,392 6,107,697    
FHLB stock [3] 551,247 663,971    
Financial Liabilities:        
Deposits [5] 6,793,170 5,294,644    
Borrowed funds 13,412,305 15,685,616    
Significant Unobservable Inputs (Level 3)        
Financial Assets:        
Securities held to maturity 769 832    
Loans, net $ 38,914,681 $ 38,245,434    
[1] Held-to-maturity securities are reported at a carrying amount equal to amortized cost less the non-credit portion of OTTI recorded in Accumulated Other Comprehensive Loss ("AOCL"). At March 31, 2016, the non-credit portion of OTTI recorded in AOCL was $8.7 million, pre-tax.
[2] 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, 2015, the non-credit portion of OTTI recorded in AOCL was $8.7 million, pre-tax.
[3] Carrying value and estimated fair value are at cost.
[4] NOW and money market accounts, savings accounts, and non-interest-bearing accounts.
[5] Certificates of deposit.