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INCOME TAXES - Effective Income Tax Reconciliation (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
Amount |  |  |  |  |  |  |  |  |  |  |
Statutory tax rate |  |  |  |  |  |  |  |  | $ 8,747 | $ 5,633 | $ 8,505
Increase (decrease) resulting from: |  |  |  |  |  |  |  |  |  |  |
State taxes, net of federal benefit |  |  |  |  |  |  |  |  | 1,120 | 547 | 908
Tax exempt interest |  |  |  |  |  |  |  |  | (1,301) | (1,375) | (1,315)
Federal tax credits |  |  |  |  |  |  |  |  | (330) | (282) | (125)
Officers' life insurance |  |  |  |  |  |  |  |  | (403) | (431) | (382)
Gain of disposal of low income housing tax credit investments |  |  |  |  |  |  |  |  | 147 |  |
Stock-based compensation plans |  |  |  |  |  |  |  |  | 52 | (20) | (120)
Other |  |  |  |  |  |  |  |  | 375 | 137 | 91
Income Tax Expense (Benefit), Total | $ 2,269 | $ 2,146 | $ 2,199 | $ 1,793 | $ 362 | $ 780 | $ 1,364 | $ 1,703 | $ 8,407 | $ 4,209 | $ 7,562
Rate |  |  |  |  |  |  |  |  |  |  |
Statutory tax rate |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
Increase (decrease) resulting from: |  |  |  |  |  |  |  |  |  |  |
State taxes, net of federal benefit |  |  |  |  |  |  |  |  | 2.69% | 2.04% | 2.24%
Tax exempt interest |  |  |  |  |  |  |  |  | (3.12%) | (5.13%) | (3.25%)
Federal tax credits |  |  |  |  |  |  |  |  | (0.79%) | (1.05%) | (0.31%)
Officers' life insurance |  |  |  |  |  |  |  |  | (0.97%) | (1.61%) | (0.94%)
Gain of Disposal of LIHTC Investments |  |  |  |  |  |  |  |  | 0.35% |  |
Stock-based compensation plans |  |  |  |  |  |  |  |  | 0.12% | (0.07%) | (0.30%)
Other |  |  |  |  |  |  |  |  | 0.90% | 0.51% | 0.23%
Effective tax rate |  |  |  |  |  |  |  |  | 20.18% | 15.69% | 18.67%

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