PARENT COMPANY STATEMENTS (CONDENSED BALANCE SHEETS) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Other assets	$ 34,735	$ 28,439
Total assets	4,875,254	4,682,976
LIABILITIES
Subordinated debt	30,928	30,928
STOCKHOLDERS' EQUITY	521,615	468,578	$ 426,978	$ 392,812
Total liabilities and stockholders' equity	4,875,254	4,682,976
Parent Company [Member]
ASSETS
Deposits with Lake City Bank	1,283	850
Deposits with other depository institutions	7,613	4,969
Cash	8,896	5,819
Investments in banking subsidiary	533,442	482,585
Investments in other subsidiaries	3,992	3,552
Other assets	6,468	7,789
Total assets	552,798	499,745
LIABILITIES
Dividends payable and other liabilities	255	239
Subordinated debt	30,928	30,928
STOCKHOLDERS' EQUITY	521,615	468,578
Total liabilities and stockholders' equity	$ 552,798	$ 499,745