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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial Assets:      
Cash and cash equivalents $ 854,678 $ 1,474,955 $ 2,528,169
FHLB stock [1] 606,371 644,590  
Loans and leases, net 40,694,787 40,006,088  
Financial Liabilities:      
Deposits 31,572,176 30,764,430  
Borrowed funds 13,626,360 14,207,866  
Financial Assets:      
Cash and cash equivalents 854,678 1,474,955  
FHLB stock [1] 606,371 644,590  
Loans and leases, net 40,608,048 39,461,985  
Financial Liabilities:      
Deposits 31,633,111 30,748,729  
Borrowed funds 14,088,303 14,136,526  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Financial Assets:      
Cash and cash equivalents 854,678 1,474,955  
Financial Liabilities:      
Deposits [2] 17,308,005 18,570,108  
Significant Other Observable Inputs (Level 2)      
Financial Assets:      
FHLB stock [1] 606,371 644,590  
Financial Liabilities:      
Deposits [3] 14,325,106 12,178,621  
Borrowed funds 14,088,303 14,136,526  
Significant Unobservable Inputs (Level 3)      
Financial Assets:      
Loans and leases, net $ 40,608,048 $ 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.