INCOME TAXES - Tax Effects of Temporary Differences and Tax Credits (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Allowance for loan losses	$ 4,900	$ 4,497
Post retirement benefit obligation	2,045	1,986
Deferred compensation	1,454	1,466
Accrued expenses	333	565
Organizational/start-up expenses	376	434
Capital loss carryforward	89	206
Interest rate swap		83
Qualified school bond tax credits	921
Affordable housing/other tax credits	74
Other	595	649
Net operating loss	356	606
Investment in real estate limited partnerships, net		158
Unrealized loss on securities available for sale	295
Unrealized loss on securities held to maturity	755	1,205
Total deferred tax assets	12,193	11,855
Deferred tax liabilities:
Loan mark-to-market adjustment	(8,218)	(3,410)
Installment sales	(224)	(128)
Unrealized gain on securities available for sale		(93)
Depreciation	(743)	(998)
Core deposit intangible	(403)	(471)
Other	(206)	(227)
Accrued pension cost	(3,200)	(3,181)
Total deferred tax liabilities	(12,994)	(8,508)
Net deferred tax asset		$ 3,347
Net deferred tax liability	$ (801)