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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)	Dec. 31, 2015 investment	Dec. 31, 2016 USD ($)
Accounting Policies [Abstract]
Maturity of interest bearing deposits			90 days
Evaluation period to return past due loans to accrual status			6 months
Balance of loans serviced for others	$ 332,998		$ 332,998			$ 328,701
Finite-Lived Intangible Assets [Line Items]
Mortgage servicing rights	2,880		2,880			2,835
Foreclosed real estate	$ 1,258		$ 1,258			346
Percentage of limited partner interest	99.00%		99.00%
Number of investments accounted for under the proportional amortization method | investment					1
Investment in real estate partnership	$ 4,556		$ 4,556			4,909
Investment in real estate partnerships, proportional amortization method	1,835		1,835			$ 1,993
Loss investment in real estate partnership	81	$ 83	196	$ 261
Losses on investments accounted for under the proportional amortization method	52	52	157	138
Recognition of federal tax credits	253	184	758	552
Advertising expense	$ 138	$ 238	$ 455	$ 591
Number of significant operating segments | segment			1
Building and Improvements | Minimum
Property, Plant and Equipment [Line Items]
Plant and equipment, useful life			10 years
Building and Improvements | Maximum
Property, Plant and Equipment [Line Items]
Plant and equipment, useful life			40 years
Furniture and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Plant and equipment, useful life			3 years
Furniture and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Plant and equipment, useful life			15 years
Deposit Premium
Finite-Lived Intangible Assets [Line Items]
Finite lives of intangible assets			10 years
Customer Lists | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite lives of intangible assets			10 years
Customer Lists | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite lives of intangible assets			15 years

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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