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INCOME TAXES - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Amount |  |  |  |  |  |  |  |  |  |  |
Statutory tax rate |  |  |  |  |  |  |  |  | $ 5,633 | $ 8,505 | $ 14,918
Increase (decrease) resulting from: |  |  |  |  |  |  |  |  |  |  |
State taxes, net of federal benefit |  |  |  |  |  |  |  |  | 547 | 908 | 986
Tax exempt interest |  |  |  |  |  |  |  |  | (1,375) | (1,315) | (2,074)
Federal tax credits |  |  |  |  |  |  |  |  | (282) | (125) | (130)
Officers' life insurance |  |  |  |  |  |  |  |  | (431) | (382) | (538)
Acquisition costs |  |  |  |  |  |  |  |  | 0 | 0 | 89
Stock-based compensation plans |  |  |  |  |  |  |  |  | (20) | (120) | (241)
Impact of federal tax reform enactment |  |  |  |  |  |  |  |  | 0 | 0 | 3,988
Other |  |  |  |  |  |  |  |  | 137 | 91 | (368)
Income Tax Expense (Benefit) | $ 362 | $ 780 | $ 1,364 | $ 1,703 | $ 1,426 | $ 2,076 | $ 2,123 | $ 1,937 | $ 4,209 | $ 7,562 | $ 16,630
Rate |  |  |  |  |  |  |  |  |  |  |
Statutory tax rate |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 35.00%
Increase (decrease) resulting from: |  |  |  |  |  |  |  |  |  |  |
State taxes, net of federal benefit |  |  |  |  |  |  |  |  | 2.04% | 2.24% | 2.31%
Tax exempt interest |  |  |  |  |  |  |  |  | (5.13%) | (3.25%) | (4.87%)
Federal tax credits |  |  |  |  |  |  |  |  | (1.05%) | (0.31%) | (0.30%)
Officers' life insurance |  |  |  |  |  |  |  |  | (1.61%) | (0.94%) | (1.26%)
Acquisition costs |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.21%
Stock-based compensation plans |  |  |  |  |  |  |  |  | (0.07%) | (0.30%) | (0.57%)
Impact of federal tax reform enactment |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 9.36%
Other |  |  |  |  |  |  |  |  | 0.51% | 0.23% | (0.86%)
Effective tax rate |  |  |  |  |  |  |  |  | 15.69% | 18.67% | 39.02%

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