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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - AVAILABLE FOR SALE SECURITIES (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Accounting Policies [Abstract]      
Available for sale securities $ 55,995   $ 65,752
Unrealized gain 9,900   12,800
Unrealized gain, net of tax 5,600   $ 7,700
Proceeds from sale of available for sale securities 6,616 $ 3,218  
Pre-tax gain on sale of available-for-sale securities $ 5,300 $ 2,600