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INCOME TAXES (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Computed statutory federal income tax provision |  |  |  |  |  |  |  |  | $ 45,803 | $ 32,744 | $ 47,091
State taxes, net of federal tax benefit |  |  |  |  |  |  |  |  | 12,262 | 9,633 | 6,817
Merger and other related costs (non-deductible) |  |  |  |  |  |  |  |  | 582 | 130 | 213
Change in valuation allowance |  |  |  |  |  |  |  |  | 17 | 49 | 31
Effective Income Tax Rate Reconciliation, Revaluation of Net Deferred Tax Assets |  |  |  |  |  |  |  |  | 0 | 0 | 1,895
New Markets Tax Credits |  |  |  |  |  |  |  |  | (2,675) | (3,960) | (3,960)
Increase in cash surrender value of life insurance |  |  |  |  |  |  |  |  | (1,144) | (1,160) | (1,445)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount |  |  |  |  |  |  |  |  | (1,696) | (1,030) | (1,253)
Stock-based compensation |  |  |  |  |  |  |  |  | (824) | (885) | (1,258)
Nontaxable interest, net |  |  |  |  |  |  |  |  | (757) | (566) | (987)
Other, net |  |  |  |  |  |  |  |  | 1,365 | (651) | 197
Total expense | $ 14,368 | $ 17,036 | $ 10,007 | $ 11,522 | $ 8,258 | $ 9,969 | $ 9,249 | $ 6,828 | $ 52,933 | $ 34,304 | $ 47,341
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Computed statutory federal income tax provision |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 35.00%
State taxes, net of federal tax benefit |  |  |  |  |  |  |  |  | 5.63% | 6.18% | 5.07%
Merger and other related costs (non-deductible) |  |  |  |  |  |  |  |  | 0.27% | 0.08% | 0.16%
Change in valuation allowance |  |  |  |  |  |  |  |  | 0.01% | 0.03% | 0.02%
Effective Income Tax Rate Reconciliation, Revaluation of Net Deferred Tax Asset, Percent |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 1.41%
New Markets Tax Credits |  |  |  |  |  |  |  |  | (1.23%) | (2.54%) | (2.94%)
Increase in cash surrender value of life insurance |  |  |  |  |  |  |  |  | (0.52%) | (0.74%) | (1.07%)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent |  |  |  |  |  |  |  |  | (0.78%) | (0.66%) | (0.93%)
Stock-based compensation |  |  |  |  |  |  |  |  | (0.38%) | (0.57%) | (0.94%)
Nontaxable interest, net |  |  |  |  |  |  |  |  | (0.35%) | (0.36%) | (0.73%)
Other, net |  |  |  |  |  |  |  |  | 0.63% | (0.42%) | 0.15%
Total expense |  |  |  |  |  |  |  |  | 24.28% | 22.00% | 35.20%

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