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INCOME TAXES (Schedule of Total Income Tax Expense Differed from Amounts Computed by Applying US Federal Income Tax Rate of 35 Percent to Income Before Taxes) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Computed "expected" tax expense |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,008 | $ 14,959 | $ 11,249
(Decrease)/increase in income taxes resulting from: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt income |  |  |  |  |  |  |  |  |  |  |  |  | (584) | (496) | (316)
State income taxes |  |  |  |  |  |  |  |  |  |  |  |  | 1,514 | 1,671 | 1,523
Bank owned life insurance income |  |  |  |  |  |  |  |  |  |  |  |  | (475) | (492) | (454)
Life insurance expense |  |  |  |  |  |  |  |  |  |  |  |  | 479 | 297 | 175
Interest disallowance |  |  |  |  |  |  |  |  |  |  |  |  | 124 | 95 | 40
Meals and entertainment expense |  |  |  |  |  |  |  |  |  |  |  |  | 76 | 77 | 69
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  | (982) | 15 | 86
Rate adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (70)
Tax reform impact |  |  |  |  |  |  |  |  |  |  |  |  | (1,648) |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  | 298 | 138 | (134)
Total income tax expense | $ 2,922 | $ 6,256 | $ 4,908 | $ 3,724 | $ 4,479 | $ 4,422 | $ 4,085 | $ 3,278 | $ 2,256 | $ 3,434 | $ 3,139 | $ 3,339 | $ 17,810 | $ 16,264 | $ 12,168

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