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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Repurchase Agreements Grouped by Counterparty (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Repurchase Agreement Counterparty [Line Items]    
Maximum aggregate balance outstanding [1],[2] $ 300,000 $ 300,000
Citigroup Global Markets [Member]    
Repurchase Agreement Counterparty [Line Items]    
Maximum aggregate balance outstanding $ 100,000  
Weighted-Average Maturity 1 month  
Jp Morgan Chase [Member]    
Repurchase Agreement Counterparty [Line Items]    
Maximum aggregate balance outstanding $ 200,000  
Weighted-Average Maturity 4 years 1 month  
[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.