v3.26.3
INVESTMENT SECURITIES - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2026
USD ($)
security
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
security
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Schedule of Investments [Line Items]          
Number of available for sale investment securities | security 1,082   1,082    
Number of available-for-sale securities unrealized loss position | security 1,081   1,081    
Sale of investment securities available-for-sale     $ 0 $ 0  
Unamortized premiums $ 34,700,000   34,700,000   $ 40,400,000
Unaccreted discounts 39,000,000.0   39,000,000.0   17,400,000
Allowance for credit losses 0   0   0
Held-to-maturity debt securities with an amortized cost basis 925,700,000   925,700,000   968,300,000
Accrued interest 2,900,000   2,900,000   3,400,000
Past due held-to-maturity debt securities 925,727,000   925,727,000   968,336,000
Fair value 8,600,000   8,600,000   13,400,000
Unrealized loss on equity investments, net 0 $ 0 (4,134,000) 0  
Realized gain on sale of equity investments, net 146,000 $ 939,000 305,000 $ 957,000  
Asset Pledged as Collateral          
Schedule of Investments [Line Items]          
Investment securities, pledged for collateral 3,800,000,000   3,800,000,000   4,100,000,000
Past Due          
Schedule of Investments [Line Items]          
Past due held-to-maturity debt securities $ 0   $ 0   $ 0