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BORROWINGS - Summary of Short-Term Borrowings (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Securities sold under repurchase agreements $ 265,029 $ 256,017
Federal Home Loan Bank advances 1,985,000 2,285,000
Federal funds purchased 1,315,000 1,000,000
Subordinated notes 114,351 137,320
Total short-term borrowings $ 3,679,380 $ 3,678,337