v3.25.4
INVESTMENT SECURITIES - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]      
Available for sale, at fair value $ 1,783,551,000 $ 1,629,058,000  
Book value of securities transferred from available for sale to held-to-maturity 0 0  
Held-to-maturity, at amortized cost $ 1,554,015,000 $ 1,586,205,000  
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other assets Other assets  
Accrued interest receivable $ 41,600,000 $ 38,700,000  
Federal Home Loan Bank of New York      
Debt Securities, Available-for-sale [Line Items]      
Investment owned, balance (in shares) 50,091 156,932  
Investment owned, cost (in dollars per share) $ 100 $ 100  
Dividend income $ 500,000 $ 400,000 $ 800,000
Traditional securities      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, at fair value 1,580,049,000 1,477,047,000  
Held-to-maturity, at amortized cost 476,950,000 542,246,000  
Traditional securities | Asset Pledged as Collateral | Federal Home Loan Bank Advances      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, at fair value 1,150,000,000 1,050,000,000.00  
Held to maturity, at fair value 393,800,000 473,200,000  
Property Assessed Clean Energy ("PACE") assessments      
Debt Securities, Available-for-sale [Line Items]      
Available for sale, at fair value 203,502,000 152,011,000  
Held-to-maturity, at amortized cost 1,077,065,000 $ 1,043,959,000  
Property Assessed Clean Energy ("PACE") assessments | External Credit Rating, Noninvestment Grade      
Debt Securities, Available-for-sale [Line Items]      
Held-to-maturity, at amortized cost $ 7,000,000.0