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INCOME TAXES - Components of Income Tax Expense (Details) - USD ($)
 3 Months Ended 12 Months Ended
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
Current:                      
Federal Tax Expense                 $ 8,705,000 $ 5,189,000 $ 5,607,000
State Tax Expense                 1,039,000 217,000 218,000
Total Current Expense                 9,744,000 5,406,000 5,825,000
Deferred                 2,898,000 470,000 142,000
Impact of federal tax reform enactment                 3,988,000 0 0
Income Tax Expense (Benefit) $ 8,545,000 $ 3,575,000 $ 3,029,000 $ 1,481,000 $ 426,000 $ 1,850,000 $ 1,804,000 $ 1,796,000 $ 16,630,000 $ 5,876,000 $ 5,967,000