PARENT COMPANY STATEMENTS - CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]
Other income									$ 1,874	$ 2,725	$ 3,564
Interest expense	$ (18,516)	$ (10,066)	$ (4,944)	$ (3,154)	$ (3,315)	$ (3,554)	$ (3,964)	$ (4,298)	(36,680)	(15,131)	(30,095)
Income tax benefit	(4,987)	(6,237)	(5,584)	(4,539)	(5,507)	(5,469)	(5,705)	(5,030)	(21,347)	(21,711)	(19,539)
NET INCOME	$ 25,977	$ 28,525	$ 25,673	$ 23,642	$ 24,283	$ 24,119	$ 24,348	$ 22,983	103,817	95,733	84,337
COMPREHENSIVE INCOME (LOSS)									(101,199)	84,082	100,022
Reportable Legal Entities | Parent Company
Condensed Financial Statements, Captions [Line Items]
Other income									1	3	0
Interest expense									0	(7)	0
Miscellaneous expense									(8,795)	(8,133)	(3,935)
INCOME BEFORE INCOME TAXES AND EQUITY IN UNDISTRIBUTED INCOME OF SUBSIDIARIES									33,096	40,253	29,444
Income tax benefit									2,770	2,360	1,065
INCOME BEFORE EQUITY IN UNDISTRIBUTED INCOME OF SUBSIDIARIES									35,866	42,613	30,509
Equity in undistributed income of subsidiaries									67,951	53,120	53,828
NET INCOME									103,817	95,733	84,337
COMPREHENSIVE INCOME (LOSS)									(101,199)	84,082	100,022
Reportable Legal Entities | Parent Company | Lake City Bank
Condensed Financial Statements, Captions [Line Items]
Dividends from Lake City Bank, Lakeland Statutory Trust II									40,590	47,355	32,079
Reportable Legal Entities | Parent Company | Non-bank Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Dividends from Lake City Bank, Lakeland Statutory Trust II									$ 1,300	$ 1,035	$ 1,300