NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Loan and Tax) (Details) $ in Thousands	1 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income recognized debt past due (less than days)		90 days
Loans charged off past due more than days		180 days
Closed end loan charged off past due more than days		120 days
Number of reportable segments | segment		1
Unrealized loss on securities, provisional income tax expense	$ 275
Change in tax rate, deferred tax asset, provisional income tax expense	$ 275
Commercial Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income discontinued over delinquent days		90 days
Closed End Consumer Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income discontinued over delinquent days		120 days
Real Estate and Open Ended Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income discontinued over delinquent days		180 days
Scenario, Forecast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Federal statutory income tax rate			24.50%
Accounting Standards Update 2018-02 | New Accounting Pronouncement, Early Adoption, Effect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reclassification of certain deferred tax effects		$ 137