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Borrowed Funds - Schedule of Short-Term Borrowings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total short-term borrowings $ 2,118,914 $ 748,628
Short-term borrowings    
Debt Instrument [Line Items]    
FHLB advances 1,732,000 427,000
Securities sold under agreements to repurchase 261,914 321,628
Federal funds purchased 125,000 0
Total short-term borrowings $ 2,118,914 $ 748,628