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DEBT SECURITIES - Additional Information (Details) - USD ($)
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Schedule Of Investments [Line Items]    
Proceeds from sales of available-for-sale debt securities $ 994,800,000  
Average yield 2.02% 1.45%
Allowance for credit losses, Held-to-Maturity securities $ 698,000 $ 802,000
Debt Securities, Held-to-maturity 273,363,000 317,786,000
Past Due [Member]    
Schedule Of Investments [Line Items]    
Debt Securities, Held-to-maturity 0 0
Municipal Bonds [Member]    
Schedule Of Investments [Line Items]    
Allowance for credit losses, Held-to-Maturity securities 700,000 $ 800,000
U.S. Treasury securities [Member]    
Schedule Of Investments [Line Items]    
Proceeds from sales of available-for-sale debt securities $ 592,800,000  
U.S. Treasury securities [Member] | Sale Of Available-for-Sale Securities Debt [Member]    
Schedule Of Investments [Line Items]    
Average yield 4.15%  
U.S. Agency MBS [Member]    
Schedule Of Investments [Line Items]    
Proceeds from sales of available-for-sale debt securities $ 402,000,000.0  
U.S. Agency MBS [Member] | Sale Of Available-for-Sale Securities Debt [Member]    
Schedule Of Investments [Line Items]    
Average yield 5.24%  
Residential MBS [Member]    
Schedule Of Investments [Line Items]    
Proceeds from sales of available-for-sale debt securities $ 384,200,000  
Average yield 2.15% 1.79%
Allowance for credit losses, Held-to-Maturity securities $ 0 $ 0
Debt Securities, Held-to-maturity $ 116,576,000 $ 129,319,000
Residential MBS [Member] | Private label [Member]    
Schedule Of Investments [Line Items]    
Average yield   6.62%
Debt Instrument Description Of Variable Rate Basis 3-month CME Term SOFR  
Spread on variable rate 0.26161%  
Residential MBS [Member] | FICO Score, Greater than 700 [Member] | Private label [Member] | LTV Less than 80 Percent [Member]    
Schedule Of Investments [Line Items]    
Loan To Value Coverage Percentage 80.00%