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PARENT COMPANY STATEMENTS - CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  | $ 3,564 | $ 2,857 | $ 2,098
Interest expense on subordinated debt | $ (5,141) | $ (6,066) | $ (7,303) | $ (11,585) | $ (13,430) | $ (15,224) | $ (16,224) | $ (15,285) | (30,095) | (60,163) | (47,699)
INCOME BEFORE INCOME TAXES AND EQUITY IN UNDISTRIBUTED INCOME OF SUBSIDIARIES |  |  |  |  |  |  |  |  | 103,876 | 107,385 | 98,944
Income tax benefit | (6,071) | (5,377) | (4,448) | (3,643) | (5,431) | (5,119) | (5,409) | (4,379) | (19,539) | (20,338) | (18,533)
NET INCOME | $ 24,592 | $ 22,776 | $ 19,670 | $ 17,299 | $ 22,198 | $ 21,454 | $ 21,713 | $ 21,682 | 84,337 | 87,047 | 80,411
COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  | 100,022 | 105,297 | 75,131
Reportable Legal Entities | Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  | 155 | 171
Interest expense on subordinated debt |  |  |  |  |  |  |  |  |  | (1,720) | (1,643)
Miscellaneous expense |  |  |  |  |  |  |  |  | (3,935) | (5,321) | (6,422)
INCOME BEFORE INCOME TAXES AND EQUITY IN UNDISTRIBUTED INCOME OF SUBSIDIARIES |  |  |  |  |  |  |  |  | 29,444 | 52,258 | 21,049
Income tax benefit |  |  |  |  |  |  |  |  | 1,065 | 2,256 | 2,795
INCOME BEFORE EQUITY IN UNDISTRIBUTED INCOME OF SUBSIDIARIES |  |  |  |  |  |  |  |  | 30,509 | 54,514 | 23,844
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 53,828 | 32,533 | 56,567
NET INCOME |  |  |  |  |  |  |  |  | 84,337 | 87,047 | 80,411
COMPREHENSIVE INCOME |  |  |  |  |  |  |  |  | 100,022 | 105,297 | 75,131
Reportable Legal Entities | Parent Company | Lake City Bank |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends from Lake City Bank, Lakeland Statutory Trust II |  |  |  |  |  |  |  |  | 32,079 | 57,842 | 27,933
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 | $ 1,302 | $ 1,010

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