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INVESTMENTS (Narrative) (Detail) - USD ($)
 1 Months Ended 9 Months Ended
Jun. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Schedule of Investments [Line Items]        
Trading securities   $ 4,195,000   $ 3,990,000
AFS debt securities, allowance   0   0
Net unrealized loss on debt securities, net of tax   91,100,000   79,400,000
Deferred tax assets, unrealized losses on available for sale securities   24,900,000   21,700,000
Provision for credit losses, HTM debt securities   1,800,000 $ 0  
Write off, accrued interest, HTM debt securities   8,000    
HTM debt securities, allowance   0   0
HTM debt securities, excluding accrued interest from amortized cost   1,500,000   1,700,000
Asset Pledged as Collateral        
Schedule of Investments [Line Items]        
AFS and HTM debt securities, amortized cost   672,100,000   821,900,000
AFS and HTM debt securities, fair value   564,700,000   726,500,000
Available-for-sale Securities        
Schedule of Investments [Line Items]        
Interest receivable   1,800,000   1,900,000
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   (48,200,000)   (52,200,000)
Deferred tax assets, unrealized losses on available for sale securities   $ 13,200,000   $ 14,300,000