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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Securities Sold Under Agreements to Repurchase (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]    
Assets sold under agreements to repurchase interest rate 1.92% 2.35%
Securities Sold Under Agreements To Repurchase [1],[2] $ 300,000 $ 300,000
long term debt [member]    
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]    
Securities Sold Under Agreements To Repurchase $ 200,000 300,000
short term debt [member]    
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]    
Assets sold under agreements to repurchase interest rate 1.53%  
Securities Sold Under Agreements To Repurchase $ 100,000 0
Maximum [Member]    
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]    
Securities Sold Under Agreements To Repurchase $ 300,000 $ 700,000
Maximum [Member] | long term debt [member]    
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]    
Assets sold under agreements to repurchase interest rate 2.26% 2.83%
Minimum [Member] | long term debt [member]    
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]    
Assets sold under agreements to repurchase interest rate 1.96% 1.96%
[1]
As of December 31, 2017, includes $200 million with an average rate of 2.11% that lenders have the right to call before their contractual maturities at various dates beginning on February 6, 2018. Subsequent to December 31, 2017, no lender has exercised its call option on repurchase agreements.
[2]
Reported net of securities purchased under agreements to repurchase (reverse repurchase agreements) by counterparty, when applicable, pursuant to ASC 210-20-45-11.