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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial Assets:      
Cash and cash equivalents $ 990,019 $ 1,474,955 $ 2,528,169
FHLB stock 588,197 644,590  
Loans, net 40,369,383 40,006,088  
Financial Liabilities:      
Deposits 31,601,125 30,764,430  
Borrowed funds 13,257,910 14,207,866  
Financial Assets:      
Cash and cash equivalents 990,019 1,474,955  
FHLB stock [1] 588,197 644,590  
Loans, net 40,257,098 39,461,985  
Financial Liabilities:      
Deposits 31,617,404 30,748,729  
Borrowed funds 13,282,486 14,136,526  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Financial Assets:      
Cash and cash equivalents 990,019 1,474,955  
Financial Liabilities:      
Deposits [2] 18,833,346 18,570,108  
Significant Other Observable Inputs (Level 2)      
Financial Assets:      
FHLB stock [1] 588,197 644,590  
Financial Liabilities:      
Deposits [3] 12,784,058 12,178,621  
Borrowed funds 13,282,486 14,136,526  
Significant Unobservable Inputs (Level 3)      
Financial Assets:      
Loans, net $ 40,257,098 $ 39,461,985  
[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.