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SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Securities Sold Under Agreements to Repurchase (Parenthetical) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Assets Sold under Agreements to Repurchase [Line Items]      
Reverse repurchase agreements $ 0   $ 0
Assets sold under agreements to repurchase fixed rate   3.90%  
Maximum [Member] | 3-Month LIBOR [Member]      
Assets Sold under Agreements to Repurchase [Line Items]      
Assets sold under agreements to repurchase interest rate 1.32%    
Minimum [Member] | 3-Month LIBOR [Member]      
Assets Sold under Agreements to Repurchase [Line Items]      
Assets sold under agreements to repurchase interest rate 1.30%    
long term debt [member]      
Assets Sold under Agreements to Repurchase [Line Items]      
Reverse repurchase agreements   $ 200,000  
long term debt [member] | Weighted Average [Member]      
Assets Sold under Agreements to Repurchase [Line Items]      
Assets sold under agreements to repurchase interest rate 3.35%   1.77%