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SECURITIES - Narrative (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
debt_security
bonds
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Investment [Line Items]      
Debt Securities, Held-to-maturity, Nonaccrual $ 0 $ 0  
Interest receivable 50,489,000 49,350,000  
Transferred Securities, Unrealized Loss, Before Tax 113,500,000 121,500,000  
Securities Transferred, Unrealized Loss, Net Of Tax 89,700,000 96,000,000  
Fair value of securities transferred from AFS to HTM 0 1,250,000,000  
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]      
Net gain (loss) on sale of securities available for sale (15,976,000) (3,819,000) $ 3,862,000
Gross realized gains on AFS securities 2,000,000 584,000 4,100,000
Gross realized loss on AFS securities 24,500,000 4,400,000 218,000
Gain (loss) on hedging activity 6,500,000    
Equity investments 9,691,000 11,181,000  
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]      
Proceeds from sale of held-to-maturity securities 0 0 0
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0  
Other-than-temporarily impaired equity investments 0    
FHLB Stock with other-than-temporary impairment $ 0    
Number of bonds rated one grade below investment grade | bonds 2    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Credit Loss Expense (Reversal) $ 0 0  
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | debt_security 373    
Net gain on sale of equity securities $ 5,058,000 0 $ 0
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Interest receivable    
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss $ 15,400,000 16,900,000  
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss $ 13,700,000 13,600,000  
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Interest receivable    
Asset Pledged as Collateral      
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]      
Debt Securities $ 2,280,000,000 1,820,000,000  
Asset Pledged As Collateral, Excess Amount      
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]      
Debt Securities 213,100,000 339,600,000  
Financial Asset, Past Due      
Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract]      
Securities HTM (estimated fair value of $138,879) $ 0 $ 0