INVESTMENT SECURITIES - Realized Gains and Losses on Sales of Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Gross realized gains and losses
Debt securities, available-for-sale, gross realized gains	$ 146	$ 14	$ 731
Debt securities, available-for-sale, gross realized losses	339	233	32
U.S. Government and agency securities
Gross realized gains and losses
Debt securities, available-for-sale, gross realized gains	0	0	0
Debt securities, available-for-sale, gross realized losses	0	0	0
Mortgage-backed securities
Gross realized gains and losses
Debt securities, available-for-sale, gross realized gains	0	0	0
Debt securities, available-for-sale, gross realized losses	0	0	0
State and political securities
Gross realized gains and losses
Debt securities, available-for-sale, gross realized gains	146	14	408
Debt securities, available-for-sale, gross realized losses	339	233	32
Other debt securities
Gross realized gains and losses
Debt securities, available-for-sale, gross realized gains	0	0	323
Debt securities, available-for-sale, gross realized losses	$ 0	$ 0	$ 0