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INCOME TAXES, Effective Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effective tax rate reconciliation [Abstract]      
Federal statutory income tax rate 35.00% 35.00% 35.00%
Increase (reduction) in taxes resulting from [Abstract]      
Tax-exempt interest (3.80%) (4.00%) (5.00%)
State income taxes, net of federal benefit 2.50% 2.70% 1.80%
Stock-based compensation (2.00%) 0.00% 0.00%
Federal deferred tax revaluation adjustment (23.70%) 0.00% 0.00%
Other, net (2.20%) (0.90%) (0.80%)
Effective income tax rate 5.80% 32.80% 31.00%