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Summary of Carrying Values, Estimated Fair Values and Fair Value Measurement Levels of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial Assets:        
Cash and cash equivalents $ 1,474,955 $ 2,528,169 $ 557,850 $ 537,674
FHLB stock 644,590 603,819    
Loans, net 40,006,088 38,265,183    
Financial Liabilities:        
Deposits 30,764,430 29,102,163    
Borrowed funds 14,207,866 12,913,679    
Financial Assets:        
Cash and cash equivalents 1,474,955 2,528,169    
FHLB stock [1] 644,590 603,819    
Loans, net 39,461,985 38,254,538    
Financial Liabilities:        
Deposits 30,748,729 29,044,852    
Borrowed funds 14,136,526 12,780,653    
Quoted Prices in Active Markets for Identical Assets (Level 1)        
Financial Assets:        
Cash and cash equivalents 1,474,955 2,528,169    
Financial Liabilities:        
Deposits [2] 18,570,108 20,458,517    
Significant Other Observable Inputs (Level 2)        
Financial Assets:        
FHLB stock [1] 644,590 603,819    
Financial Liabilities:        
Deposits [3] 12,178,621 8,586,335    
Borrowed funds 14,136,526 12,780,653    
Significant Unobservable Inputs (Level 3)        
Financial Assets:        
Loans, net $ 39,461,985 $ 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.