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Summary of Carrying Values, Estimated Fair Values and Fair Value Measurement Levels of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financial Assets:    
Cash and cash equivalents $ 1,731,754 $ 2,528,169
FHLB stock [1] 654,939 603,819
Loans, net 39,678,616 38,265,183
Financial Liabilities:    
Deposits 30,319,284 29,102,163
Borrowed funds 13,840,422 12,913,679
Financial Assets:    
Cash and cash equivalents 1,731,754 2,528,169
FHLB stock [1] 654,939 603,819
Loans, net 38,940,057 38,254,538
Financial Liabilities:    
Deposits 30,279,953 29,044,852
Borrowed funds 13,693,629 12,780,653
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Assets:    
Cash and cash equivalents 1,731,754 2,528,169
Financial Liabilities:    
Deposits [2] 18,909,310 20,458,517
Significant Other Observable Inputs (Level 2)    
Financial Assets:    
FHLB stock [1] 654,939 603,819
Financial Liabilities:    
Deposits [3] 11,370,643 8,586,335
Borrowed funds 13,693,629 12,780,653
Significant Unobservable Inputs (Level 3)    
Financial Assets:    
Loans, net $ 38,940,057 $ 38,254,538
[1] Carrying value and estimated fair value are at cost.
[2] Interest-bearing checking and money market accounts, savings accounts, and non-interest-bearing accounts.
[3] Certificates of deposit.