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INVESTMENTS (Narrative) (Detail) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Jun. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Schedule of Investments [Line Items]              
Trading securities $ 5,141,000       $ 5,141,000   $ 4,647,000
AFS debt securities, allowance 0       0   0
Net unrealized loss on debt securities, net of tax 48,300,000       48,300,000   60,500,000
Deferred tax assets, unrealized losses on available for sale securities 13,200,000       13,200,000   16,600,000
Provision for credit losses, HTM debt securities 0 $ 0 $ 1,800,000   (910,000) $ 1,838,000  
Write off, accrued interest, HTM debt securities 0 $ 0     910,000 $ (1,838,000)  
HTM debt securities, excluding accrued interest from amortized cost 1,500,000       1,500,000   1,700,000
Asset Pledged as Collateral              
Schedule of Investments [Line Items]              
AFS and HTM debt securities, amortized cost 513,600,000       513,600,000   675,500,000
AFS and HTM debt securities, fair value 466,500,000       466,500,000   607,900,000
Available-for-sale Securities              
Schedule of Investments [Line Items]              
Interest receivable 1,700,000       1,700,000   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 (43,000,000)       (43,000,000)   (46,900,000)
Deferred tax assets, unrealized losses on available for sale securities $ 11,800,000       11,800,000   $ 12,800,000
Signature Bank Corporate Bond              
Schedule of Investments [Line Items]              
Write off, accrued interest, HTM debt securities         $ 8,000