v3.26.1
INVESTMENT SECURITIES - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
security
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
security
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Schedule of Investments [Line Items]          
Number of available for sale investment securities | security 1,071   1,071    
Number of available-for-sale securities unrealized loss position | security 1,003   1,003    
Sale of investment securities available-for-sale     $ 0 $ 0  
Unamortized premiums $ 36,700,000   36,700,000   $ 40,400,000
Unaccreted discounts 34,300,000   34,300,000   17,400,000
Allowance for credit losses 0   0   0
Held-to-maturity debt securities with an amortized cost basis 943,300,000   943,300,000   968,300,000
Accrued interest 3,400,000   3,400,000   3,400,000
Past due held-to-maturity debt securities 943,297,000   943,297,000   968,336,000
Fair value 8,900,000   8,900,000   13,400,000
Impairment loss (4,100,000)   (4,100,000)    
Realized gain on sale of equity investments, net 159,000 $ 18,000 159,000 18,000  
Asset Pledged as Collateral          
Schedule of Investments [Line Items]          
Investment securities, pledged for collateral 3,600,000,000   3,600,000,000   4,100,000,000
Maximum          
Schedule of Investments [Line Items]          
Realized gain on sale of equity investments, net   $ 100,000   $ 100,000  
Past Due          
Schedule of Investments [Line Items]          
Past due held-to-maturity debt securities $ 0   $ 0   $ 0