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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Repurchase Agreements Grouped by Counterparty (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Repurchase Agreement Counterparty [Line Items]    
Securities Sold Under Agreements To Repurchase $ 300,000 $ 300,000
JP Morgan Chase [Member]    
Repurchase Agreement Counterparty [Line Items]    
Securities Sold Under Agreements To Repurchase $ 100,000  
Weighted-Average Maturity 4 months  
CREDIT SUISSE (US) [Member]    
Repurchase Agreement Counterparty [Line Items]    
Securities Sold Under Agreements To Repurchase $ 200,000  
Weighted-Average Maturity 40 months