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SHORT-TERM BORROWINGS (Narrative) (Details) - USD ($)	12 Months Ended
SHORT-TERM BORROWINGS (Narrative) (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SHORT-TERM BORROWINGS
Maximum borrowing capacity	$ 2,230,000,000
FHLB advances and other short-term borrowings	5,000,000	$ 0	$ 22,000,000
Interest on short-term borrowings	1,055,000	2,000	$ 718,000
Central Bank \| Federal Reserve Bank Advances
SHORT-TERM BORROWINGS
Additional unused borrowings available	75,900,000	55,400,000
Federal Home Loan Bank Borrowings
SHORT-TERM BORROWINGS
FHLB advances and other short-term borrowings	5,000,000
Standby letters of credit issued	36,000,000	32,200,000
Federal Home Loan Bank Borrowings \| Asset Pledged as Collateral
SHORT-TERM BORROWINGS
Loans, net of ACL	3,280,000,000
Federal Reserve Bank Advances \| Asset Pledged as Collateral
SHORT-TERM BORROWINGS
Loans, net of ACL	125,000,000	$ 131,000,000
FHLB line of credit
SHORT-TERM BORROWINGS
Additional unused borrowings available	$ 2,190,000,000