Annual report [Section 13 and 15(d), not S-K Item 405]

SECURITIES AND OTHER INVESTMENTS (Narrative) (Details)

v3.25.4
SECURITIES AND OTHER INVESTMENTS (Narrative) (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Schedule Of Debt Investments [Line Items]      
Available for sale securities past due or non-accrual $ 0 $ 0  
Available for sale securities that had been in a continuous loss position for more than 12 months, Number of issues | security 703 726  
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss $ 313,266,000 $ 403,433,000  
AFS securities in an unrealized loss, credit related impairment 0 0  
Available for sale securities, allowance for credit losses 0 0  
HTM securities past due or non accrual 0 0  
Restricted equity securities consist of Federal Reserve Bank stock 141,200,000 82,900,000  
Federal Home Loan Bank Stock 49,000,000 20,100,000  
Amortization of Tax Equity Investments 10,800,000 8,800,000 $ 4,800,000
Tax credits and savings on Tax Equity Investments 14,200,000 10,300,000 $ 5,700,000
Carrying value of Tax Equity Investments 136,500,000 88,700,000  
Unfunded commitments related to Tax Equity Investments $ 91,500,000 $ 55,600,000  
Restricted equity securities as a percentage of outstanding borrowings, required by FHLB 4.75% 4.75%  
Restricted equity securities as a percentage of outstanding borrowings, required by FRB 6.00% 6.00%  
Held-to-Maturity Securities      
Schedule Of Debt Investments [Line Items]      
Accrued interest receivable $ 9,900,000 $ 8,400,000  
Available-for-sale Securities      
Schedule Of Debt Investments [Line Items]      
Accrued interest receivable $ 15,000,000 $ 10,100,000  
Mortgage-Backed Securities, Issued by Private Enterprises [Member]      
Schedule Of Debt Investments [Line Items]      
SSFA rating percentage 20.00% 20.00%