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INCOME TAXES (Details 1) - 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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Computed statutory federal income tax provision |  |  |  |  |  |  |  |  | $ 47,091 | $ 39,226 | $ 32,262
State taxes, net of federal tax benefit |  |  |  |  |  |  |  |  | 6,817 | 5,643 | 4,500
Revaluation of net deferred tax assets |  |  |  |  |  |  |  |  | 1,895 | 0 | 0
Merger and other related costs (non-deductible) |  |  |  |  |  |  |  |  | 213 | 210 | 185
Change in valuation allowance |  |  |  |  |  |  |  |  | 31 | 28 | 41
New Markets Tax Credits |  |  |  |  |  |  |  |  | (3,960) | (6,360) | (6,514)
Increase in cash surrender value of life insurance |  |  |  |  |  |  |  |  | (1,445) | (1,431) | (1,292)
Stock-based compensation |  |  |  |  |  |  |  |  | (1,258) | 0 | 0
Low Income Housing Project Investments |  |  |  |  |  |  |  |  | (1,253) | (1,641) | (1,182)
Nontaxable interest, net |  |  |  |  |  |  |  |  | (987) | (996) | (973)
Other, net |  |  |  |  |  |  |  |  | 197 | 748 | 191
Total expense | $ 14,915 | $ 12,681 | $ 10,731 | $ 9,014 | $ 7,698 | $ 9,793 | $ 9,508 | $ 8,428 | $ 47,341 | $ 35,427 | $ 27,218
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Computed statutory federal income tax provision |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
State taxes, net of federal tax benefit |  |  |  |  |  |  |  |  | 5.07% | 5.03% | 4.88%
Revaluation of net deferred tax assets |  |  |  |  |  |  |  |  | 1.41% | 0.00% | 0.00%
Merger and other related costs (non-deductible) |  |  |  |  |  |  |  |  | 0.16% | 0.19% | 0.20%
Change in valuation allowance |  |  |  |  |  |  |  |  | 0.02% | 0.02% | 0.04%
New Markets Tax Credits |  |  |  |  |  |  |  |  | (2.94%) | (5.67%) | (7.07%)
Increase in cash surrender value of life insurance |  |  |  |  |  |  |  |  | (1.07%) | (1.28%) | (1.40%)
Stock-based compensation |  |  |  |  |  |  |  |  | (0.94%) | (0.00%) | (0.00%)
Low Income Housing Project Investments |  |  |  |  |  |  |  |  | (0.93%) | (1.46%) | (1.28%)
Nontaxable interest, net |  |  |  |  |  |  |  |  | (0.73%) | (0.89%) | (1.06%)
Other, net |  |  |  |  |  |  |  |  | 0.15% | 0.67% | 0.22%
Total expense |  |  |  |  |  |  |  |  | 35.20% | 31.61% | 29.53%

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