PARENT COMPANY STATEMENTS - Schedule of Condensed Statements of Income and Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]
Other income									$ 4,674	$ 9,141	$ 1,874
Income tax benefit	$ (5,036)	$ (4,400)	$ (4,373)	$ (4,402)	$ (6,436)	$ (4,479)	$ (1,880)	$ (3,771)	(18,211)	(16,566)	(21,347)
NET INCOME	$ 24,190	$ 23,338	$ 22,549	$ 23,401	$ 29,626	$ 25,252	$ 14,611	$ 24,278	93,478	93,767	103,817
COMPREHENSIVE INCOME (LOSS)									82,173	127,495	(101,199)
Reportable Legal Entities | Parent Company
Condensed Financial Statements, Captions [Line Items]
Other income									2	5	1
Miscellaneous expense									(5,642)	(4,768)	(8,795)
INCOME BEFORE INCOME TAXES AND EQUITY IN UNDISTRIBUTED INCOME OF SUBSIDIARIES									36,478	43,025	33,096
Income tax benefit									1,608	1,957	2,770
INCOME BEFORE EQUITY IN UNDISTRIBUTED INCOME OF SUBSIDIARIES									38,086	44,982	35,866
Equity in undistributed income of subsidiaries									55,392	48,785	67,951
NET INCOME									93,478	93,767	103,817
COMPREHENSIVE INCOME (LOSS)									82,173	127,495	(101,199)
Reportable Legal Entities | Parent Company | Lake City Bank
Condensed Financial Statements, Captions [Line Items]
Dividends from Lake City Bank and non-bank subsidiaries									42,118	46,263	40,590
Reportable Legal Entities | Parent Company | Non-Bank Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Dividends from Lake City Bank and non-bank subsidiaries									$ 0	$ 1,525	$ 1,300