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INCOME TAXES - Computation of Differences Between Financial Statement Tax Expense And Amounts (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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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
INCOME TAXES |  |  |  |  |  |  |  |  |  |  |
Income taxes at statutory federal rate of 21% |  |  |  |  |  |  |  |  | $ 21,814,000 | $ 22,551,000 | $ 20,778,000
Increase (decrease) in taxes resulting from: |  |  |  |  |  |  |  |  |  |  |
Tax exempt income |  |  |  |  |  |  |  |  | (1,925,000) | (1,682,000) | (1,434,000)
Nondeductible expense |  |  |  |  |  |  |  |  | 117,000 | 194,000 | 165,000
State income tax, net of federal tax effect |  |  |  |  |  |  |  |  | 944,000 | 1,040,000 | 1,077,000
Captive insurance premium income |  |  |  |  |  |  |  |  | (227,000) | (310,000) | (292,000)
Tax credits |  |  |  |  |  |  |  |  | (540,000) | (548,000) | (412,000)
Bank owned life insurance |  |  |  |  |  |  |  |  | (595,000) | (573,000) | (303,000)
Long - term incentive plan |  |  |  |  |  |  |  |  | (58,000) | (421,000) | (641,000)
Revaluation deferred tax asset at 21% rate |  |  |  |  |  |  |  |  |  |  | (408,000)
Other |  |  |  |  |  |  |  |  | 9,000 | 87,000 | 3,000
Total income tax expense | $ 6,071,000 | $ 5,377,000 | $ 4,448,000 | $ 3,643,000 | $ 5,431,000 | $ 5,119,000 | $ 5,409,000 | $ 4,379,000 | $ 19,539,000 | $ 20,338,000 | $ 18,533,000

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