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INCOME TAXES - 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 |  |  |  |  |  |  |  |  |  |  |
Federal income tax expense computed by applying the statutory rate to income before income taxes |  |  |  |  |  |  |  |  | $ 11,703 | $ 13,808 | $ 10,157
Tax exempt interest |  |  |  |  |  |  |  |  | (851) | (920) | (1,002)
State taxes, net of federal income tax benefit |  |  |  |  |  |  |  |  | 1,214 | 1,425 | 1,999
Other |  |  |  |  |  |  |  |  | 1,619 | (253) | (2,013)
Total income tax expense | $ 3,881 | $ 3,999 | $ 3,129 | $ 2,676 | $ 3,934 | $ 3,852 | $ 2,859 | $ 3,415 | $ 13,685 | $ 14,060 | $ 9,141
Percentage of Pre-tax Earnings |  |  |  |  |  |  |  |  |  |  |
Federal income tax expense computed by applying the statutory rate to income before income taxes (as a percent) |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
Tax exempt interest (as a percent) |  |  |  |  |  |  |  |  | (1.00%) | (1.00%) | (2.00%)
State taxes, net of federal income tax benefit (as a percent) |  |  |  |  |  |  |  |  | 2.00% | 2.00% | 4.00%
Other (as a percent) |  |  |  |  |  |  |  |  | 3.00% | (1.00%) | (4.00%)
Income tax expense (as a percent) |  |  |  |  |  |  |  |  | 25.00% | 21.00% | 19.00%

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