v3.25.2
INVESTMENTS (Narrative) (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Schedule of Investments [Line Items]              
Trading securities $ 5,326,000       $ 5,326,000   $ 5,243,000
AFS debt securities, allowance 0       0   0
Net unrealized loss on debt securities, net of tax 45,000,000.0       45,000,000.0   62,200,000
Deferred tax assets, unrealized losses on available for sale securities 13,000,000       13,000,000   17,000,000
Provision for credit losses, HTM debt securities 0     $ 1,800,000 0 $ (910,000) 0
HTM debt securities, excluding accrued interest from amortized cost 1,700,000       1,700,000   1,600,000
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Recovery 0 $ 910,000          
Write off, accrued interest, HTM debt securities   $ 910,000          
Asset Pledged as Collateral              
Schedule of Investments [Line Items]              
AFS and HTM debt securities, amortized cost 872,500,000       872,500,000   519,900,000
AFS and HTM debt securities, fair value 811,600,000       811,600,000   449,000,000.0
Available-for-sale Securities              
Schedule of Investments [Line Items]              
Interest receivable 2,400,000       2,400,000   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 (39,400,000)       (39,400,000)   (41,800,000)
Deferred tax assets, unrealized losses on available for sale securities $ 11,400,000       $ 11,400,000   $ 11,400,000