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INCOME TAXES (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Computed statutory federal income tax provision |  |  |  |  |  |  |  |  | $ 39,226 | $ 32,262 | $ 29,310
State taxes, net of federal tax benefit |  |  |  |  |  |  |  |  | 5,643 | 4,500 | 4,104
Nontaxable interest, net |  |  |  |  |  |  |  |  | (996) | (973) | (795)
New Markets Tax Credits |  |  |  |  |  |  |  |  | (6,360) | (6,514) | (6,708)
Low Income Housing Project Investments |  |  |  |  |  |  |  |  | (1,641) | (1,182) | (594)
Increase in cash surrender value of life insurance and gain on life insurance benefits |  |  |  |  |  |  |  |  | (1,431) | (1,292) | (1,782)
Merger and other related costs (non-deductible) |  |  |  |  |  |  |  |  | 210 | 185 | 274
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  |  |  |  |  |  |  |  | 28 | 41 | 0
Other, net |  |  |  |  |  |  |  |  | 748 | 191 | 90
Total expense | $ 7,698 | $ 9,793 | $ 9,508 | $ 8,428 | $ 8,268 | $ 7,867 | $ 7,213 | $ 3,869 | $ 35,427 | $ 27,218 | $ 23,899
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 |  |  |  |  |  |  |  |  | 5.03% | 4.88% | 4.90%
Nontaxable interest, net |  |  |  |  |  |  |  |  | (0.89%) | (1.06%) | (0.95%)
New Markets Tax Credits |  |  |  |  |  |  |  |  | (5.67%) | (7.07%) | (8.01%)
Low Income Housing Project Investments |  |  |  |  |  |  |  |  | (1.46%) | (1.28%) | (0.71%)
Increase in cash surrender value of life insurance and gain on life insurance benefits |  |  |  |  |  |  |  |  | (1.28%) | (1.40%) | (2.13%)
Merger and other related costs (non-deductible) |  |  |  |  |  |  |  |  | 0.19% | 0.20% | 0.33%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent |  |  |  |  |  |  |  |  | 0.02% | 0.04% | 0.00%
Other, net |  |  |  |  |  |  |  |  | 0.67% | 0.22% | 0.11%
Total expense |  |  |  |  |  |  |  |  | 31.61% | 29.53% | 28.54%

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