Annual report pursuant to Section 13 and 15(d)

SECURITIES AND OTHER INVESTMENTS (Narrative) (Details)

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SECURITIES AND OTHER INVESTMENTS (Narrative) (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
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 757 363
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss $ 382,167,000 $ 322,446,000
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 67,000,000.0 67,000,000.0
Federal Home Loan Bank Stock 48,400,000 53,200,000
Amortization of Tax Equity Investments 4,800,000 4,100,000
Tax credits and savings on Tax Equity Investments 5,700,000 4,900,000
Carrying value of Tax Equity Investments 64,300,000 51,000,000.0
Unfunded commitments related to Tax Equity Investments $ 39,500,000 $ 27,800,000
Restricted equity securities as a percentage of outstanding borrowings, required by FHLB 4.25% 3.75%
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 $ 8,400,000 $ 8,600,000
Available-for-sale Securities    
Schedule Of Debt Investments [Line Items]    
Accrued interest receivable $ 9,500,000 $ 14,200,000
Non-agency collateralized mortgage obligations    
Schedule Of Debt Investments [Line Items]    
SSFA rating percentage 20.00% 20.00%