LOANS (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Loans and Leases [Line Items]
Accrued interest receivable	$ 52,100,000		$ 52,100,000			$ 49,100,000
Nonpass loans	11,717,974,000		11,717,974,000			11,428,352,000
Allowance for credit losses	111,198,000	$ 101,353,000	111,198,000	$ 101,353,000	$ 112,707,000	$ 109,483,000	$ 100,522,000	$ 110,088,000
Loans secured by residential real estate property in process of foreclosure	$ 176,000		$ 176,000
Loans delinquent 30 to 89 days, percentage	0.12%		0.12%			0.04%
Interest income on nonaccrual loans	$ 0	$ 0	$ 0	$ 0
Nonaccrual loans with no related allowance	28,700,000		28,700,000			$ 26,700,000
Unfunded commitments	2,700,000		2,700,000
Paycheck Protection Program ("PPP") | Nonpass
Loans and Leases [Line Items]
Nonpass loans	126,000		126,000			$ 2,700,000
Allowance for credit losses	$ 0		$ 0