IMPAIRED LOANS AND ALLOWANCE FOR LOAN LOSSES - Company's Average Recorded Investments in Impaired Loans and Related Interest Income (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Average Recorded Investment
Total	$ 30,251	$ 30,759	$ 31,205	$ 31,662
Interest Income Recognized
Total	368	352	1,106	1,073
Commercial Real Estate [Member]
Average Recorded Investment
Impaired Loans with No Related Allowance Recorded	3,004	1,437	2,833	1,854
Impaired Loans with an Allowance Recorded	4,953	6,565	5,789	6,835
Total	7,957	8,002	8,622	8,689
Interest Income Recognized
Impaired Loans with No Related Allowance Recorded	75	31	154	97
Impaired Loans with an Allowance Recorded	56	64	163	193
Total	131	95	317	290
Residential Real Estate [Member]
Average Recorded Investment
Impaired Loans with No Related Allowance Recorded	10,266	9,346	9,933	9,444
Impaired Loans with an Allowance Recorded	9,831	12,038	11,029	12,098
Total	20,097	21,384	20,962	21,542
Interest Income Recognized
Impaired Loans with No Related Allowance Recorded	150	138	447	406
Impaired Loans with an Allowance Recorded	63	102	260	322
Total	213	240	707	728
Construction and Land Development [Member]
Average Recorded Investment
Impaired Loans with No Related Allowance Recorded	517	208	460	188
Impaired Loans with an Allowance Recorded	333	609	242	671
Total	850	817	702	859
Interest Income Recognized
Impaired Loans with No Related Allowance Recorded	13	3	35	11
Impaired Loans with an Allowance Recorded	2	7	8	20
Total	15	10	43	31
Commercial And Financial [Member]
Average Recorded Investment
Impaired Loans with No Related Allowance Recorded	244	16	183	16
Impaired Loans with an Allowance Recorded	646	0	378	0
Total	890	16	561	16
Interest Income Recognized
Impaired Loans with No Related Allowance Recorded	1	0	3	0
Impaired Loans with an Allowance Recorded	2	0	14	0
Total	3	0	17	0
Consumer Portfolio Segment [Member]
Average Recorded Investment
Impaired Loans with No Related Allowance Recorded	124	157	111	193
Impaired Loans with an Allowance Recorded	333	383	247	363
Total	457	540	358	556
Interest Income Recognized
Impaired Loans with No Related Allowance Recorded	3	3	10	10
Impaired Loans with an Allowance Recorded	3	4	12	14
Total	$ 6	$ 7	$ 22	$ 24

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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