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INCOME TAXES - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Amount |  |  |  |  |  |  |  |  |  |  |
Statutory Tax Rate |  |  |  |  |  |  |  |  | $ 8,505 | $ 14,918 | $ 7,283
Increase (Decrease) Resulting From: |  |  |  |  |  |  |  |  |  |  |
State taxes, net of federal benefit |  |  |  |  |  |  |  |  | 908 | 986 | 141
Tax exempt interest |  |  |  |  |  |  |  |  | (1,315) | (2,074) | (1,388)
Federal tax credits |  |  |  |  |  |  |  |  | (125) | (130) | 0
Officers' life insurance |  |  |  |  |  |  |  |  | (382) | (538) | (244)
Acquisition Costs |  |  |  |  |  |  |  |  | 0 | 89 | 289
Stock-based compensation plans |  |  |  |  |  |  |  |  | (120) | (241) | 0
Impact of federal tax reform enactment |  |  |  |  |  |  |  |  | 0 | 3,988 | 0
Other |  |  |  |  |  |  |  |  | 91 | (368) | (205)
Income Tax Expense (Benefit) | $ 1,426 | $ 2,076 | $ 2,123 | $ 1,937 | $ 8,545 | $ 3,575 | $ 3,029 | $ 1,481 | $ 7,562 | $ 16,630 | $ 5,876
Rate |  |  |  |  |  |  |  |  |  |  |
Statutory Tax Rate |  |  |  |  |  |  |  |  | 21.00% | 35.00% | 35.00%
Increase (Decrease) Resulting From: |  |  |  |  |  |  |  |  |  |  |
State taxes, net of federal benefit |  |  |  |  |  |  |  |  | 2.24% | 2.31% | 0.68%
Tax exempt interest |  |  |  |  |  |  |  |  | (3.25%) | (4.87%) | (6.67%)
Federal tax credits |  |  |  |  |  |  |  |  | (0.31%) | (0.30%) | (0.00%)
Officers' life insurance |  |  |  |  |  |  |  |  | (0.94%) | (1.26%) | (1.17%)
Acquisition Costs |  |  |  |  |  |  |  |  | 0.00% | 0.21% | 1.39%
Stock-based compensation plans |  |  |  |  |  |  |  |  | (0.30%) | (0.57%) | 0.00%
Impact of federal tax reform enactment |  |  |  |  |  |  |  |  | 0.00% | 9.36% | 0.00%
Other |  |  |  |  |  |  |  |  | 0.23% | (0.86%) | (0.99%)
Effective Tax Rate |  |  |  |  |  |  |  |  | 18.67% | 39.02% | 28.24%

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