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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Schedule of Repurchase Agreement Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Sold Under Agreements To Repurchase $ 300,000 $ 100,000
One year to three years [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Sold Under Agreements To Repurchase 100,000  
Three years to five years    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Sold Under Agreements To Repurchase $ 200,000