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INVESTMENTS - Narrative (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]      
Amortized cost of debt securities transferred to held-to-maturity   $ 305,600  
Fair value of debt securities transferred to held-to-maturity   289,400  
Unrealized losses on debt securities transferred to held-to-maturity   $ 16,200  
Book value of debt securities pledged as collateral $ 1,626,295   $ 1,466,350
Asset Pledged as Collateral | Deposits      
Schedule of Investments [Line Items]      
Book value of debt securities pledged as collateral 533,900   $ 531,600
GNMA, FNMA, and FHLMC | Collateralized mortgage obligations      
Schedule of Investments [Line Items]      
Mortgage-backed securities 500,100    
GNMA, FNMA, and FHLMC | Mortgage-backed securities      
Schedule of Investments [Line Items]      
Mortgage-backed securities 660,500    
GNMA, FNMA, and FHLMC | SBA asset-backed securities      
Schedule of Investments [Line Items]      
Mortgage-backed securities $ 42,300