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INCOME TAXES (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) Partnership	Dec. 31, 2016 USD ($) Partnership	Dec. 31, 2015 USD ($)
Provision for income taxes [Abstract]
Currently payable									$ 4,583	$ 2,672	$ 2,913
Change in corporate tax rate									1,531	0	0
Deferred tax									(83)	362	(192)
Provision for income taxes	$ 2,934	$ 1,141	$ 1,033	$ 923	$ 789	$ 767	$ 687	$ 791	6,031	3,034	2,721
Deferred tax assets [Abstract]
Allowance for loan losses	3,058				4,518				3,058	4,518
Deferred compensation	464				757				464	757
Merger & acquisition costs	7				16				7	16
Allowance for losses on available-for-sale securities	6				250				6	250
Pensions and other retirement obligation	297				1,454				297	1,454
Interest on non-accrual loans	917				1,259				917	1,259
Incentive plan accruals	324				421				324	421
Other real estate owned	108				152				108	152
Unrealized losses on available-for-sale securities	71				0				71	0
Low income housing tax credits	64				94				64	94
NOL carry forward	339				709				339	709
AMT Credit Carryforward	8				8				8	8
Other	117				156				117	156
Total	5,780				9,794				5,780	9,794
Deferred tax liabilities [Abstract]
Premises and equipment	(623)				(998)				(623)	(998)
Investment securities accretion	(66)				(189)				(66)	(189)
Loan fees and costs	(257)				(369)				(257)	(369)
Goodwill and core deposit intangibles	(2,200)				(3,573)				(2,200)	(3,573)
Mortgage servicing rights	(146)				(233)				(146)	(233)
Unrealized gains on available-for-sale securities	0				(673)				0	(673)
Other	(7)				(17)				(7)	(17)
Total	(3,299)				(6,052)				(3,299)	(6,052)
Deferred tax asset, net	2,481				3,742				2,481	3,742
Valuation allowance	0				0				0	0
Total provision for income taxes reconciliation [Abstract]
Provision at statutory rates on pre-tax income									6,505	5,328	4,878
Effect of tax-exempt income									(1,710)	(1,943)	(1,915)
Low income housing tax credits									(141)	(198)	(198)
Bank owned life insurance									(225)	(234)	(214)
Nondeductible interest									54	55	61
Nondeductible merger and acquisition expenses									0	0	102
Change in tax rate									1,531	0	0
Other items									17	26	7
Provision for income taxes	2,934	$ 1,141	$ 1,033	$ 923	789	$ 767	$ 687	$ 791	$ 6,031	$ 3,034	$ 2,721
Statutory tax rates									34.00%	34.00%	34.00%
Effective tax rates									31.60%	19.40%	19.00%
Minimum percentages of tax position liable to be realized upon ultimate settlement									50.00%
Liability for uncertain tax positions	0								$ 0
Unrecognized tax benefits	0								$ 0
Number of investments in partnerships | Partnership									4	4
Investment amount in partnerships	541				$ 700				$ 541	$ 700
Tax Credit Carryforward [Line Items]
Investment tax credits	$ 705								705
Amortization of investments in other expenses									$ 159	259	$ 259
Investment Tax Credit Carryforward [Member]
Tax Credit Carryforward [Line Items]
Tax credits recognition period									5 years
Tax credits recognized as reduction of tax expense amount									$ 141	$ 198	$ 198

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