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BORROWINGS - Summary of Short-Term Borrowings (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
Securities sold under repurchase agreements $ 270,216 $ 313,062
Federal Home Loan Bank advances 2,620,000 1,025,000
Federal funds purchased 1,402,000 1,037,000
Subordinated notes 133,751 127,948
Total short-term borrowings $ 4,425,967 $ 2,503,010