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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Securities Sold Under Agreements to Repurchase (Parenthetical) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase $ 100,000 $ 300,000
Callable repurchase agreements    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets sold under agreements to repurchase interest rate 1.96%  
Securities sold under agreements to repurchase $ 100,000  
short term debt [member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase 0 100,000
long term debt [member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase $ 100,000 $ 200,000
Minimum [Member] | long term debt [member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets sold under agreements to repurchase interest rate   0.0196%
Weighted Average [Member] | short term debt [member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets sold under agreements to repurchase interest rate   1.53%
Weighted Average [Member] | long term debt [member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets sold under agreements to repurchase interest rate 2.26%  
Maximum [Member] | long term debt [member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets sold under agreements to repurchase interest rate   2.26%