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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Narratives (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]      
Weighted-average interest rates on repurchase agreements 1.92% 2.35%  
Maximum aggregate balance outstanding [1],[2] $ 300,000 $ 300,000  
Gain Loss On Sale Of Securities Net 371 6,104 $ 0
long term debt [member]      
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]      
Maximum aggregate balance outstanding $ 200,000 300,000  
short term debt [member]      
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]      
Weighted-average interest rates on repurchase agreements 1.53%    
Maximum aggregate balance outstanding $ 100,000 0  
Repurchase Agreements [Member]      
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]      
Accrued interest payable on repurchase agreements $ 1,800 $ 1,900  
Weighted average interest rate 3.64% 3.28%  
Callable Repurchase Agreements [Member] | long term debt [member]      
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]      
Weighted-average interest rates on repurchase agreements 2.11%    
Maximum aggregate balance outstanding $ 200,000    
Maximum [Member]      
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]      
Maximum aggregate balance outstanding $ 300,000 $ 700,000  
Maximum [Member] | long term debt [member]      
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]      
Weighted-average interest rates on repurchase agreements 2.26% 2.83%  
Weighted Average [Member]      
Securities Sold Under Agreements To Repurchase And Other Short Term Borrowings [Line Items]      
Average balance outstanding $ 300,000 $ 616,400  
[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.