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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Securities Sold Under Agreements to Repurchase (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements $ 100,000 $ 300,000
short term debt [member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements 0 100,000
long term debt [member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements $ 100,000 $ 200,000