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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Repurchase Agreements Grouped by Counterparty (Detail) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements, interest ranging from 2.45% to 3.39% (December 31, 2011 - 2.50% to 4.40%) (1) [1],[2] $ 300,000 $ 300,000
Jp Morgan Chase [Member]    
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements, interest ranging from 2.45% to 3.39% (December 31, 2011 - 2.50% to 4.40%) (1) $ 200,000  
Weighted-Average Maturity 4 years 4 months  
Dean Witter Morgan Stanley [Member]    
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements, interest ranging from 2.45% to 3.39% (December 31, 2011 - 2.50% to 4.40%) (1) $ 100,000  
Weighted-Average Maturity 1 month  
[1]
As of September 30, 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 July 19, 2017. In addition, $100 million is tied to variable rates.
[2]
Reported net of securities purchased under agreements to repurchase (reverse repurchase agreements) by counterparty, when applicable, pursuant to ASC 210-20-45-11.