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INVESTMENTS (Narrative) (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]          
Trading securities $ 4,860,000     $ 5,243,000  
AFS debt securities, allowance 0     0  
Net unrealized loss on debt securities, net of tax 49,000,000.0     62,200,000  
Deferred tax assets, unrealized losses on available for sale securities 14,100,000     17,000,000  
Provision for credit losses, HTM debt securities 0 $ (910,000) $ 1,800,000 0  
Write off, accrued interest, HTM debt securities   910,000      
HTM debt securities, excluding accrued interest from amortized cost 1,400,000     1,600,000  
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Recovery 0 $ 910,000      
Asset Pledged as Collateral          
Schedule of Investments [Line Items]          
AFS and HTM debt securities, amortized cost 743,500,000     519,900,000  
AFS and HTM debt securities, fair value 680,500,000     449,000,000.0  
Available-for-sale Securities          
Schedule of Investments [Line Items]          
Interest receivable 2,300,000     1,700,000  
Transferred Securities          
Schedule of Investments [Line Items]          
AFS debt securities transferred to HTM, fair value         $ 520,300,000
AFS debt securities, transfer, unrealized loss         $ 72,100,000
Net unrealized loss on debt securities, net of tax (40,700,000)     (41,800,000)  
Deferred tax assets, unrealized losses on available for sale securities $ 11,800,000     $ 11,400,000