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	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Average Recorded Investment
Total	$ 31,078	$ 31,749	$ 31,682	$ 32,116
Interest Income Recognized
Total	354	224	739	431
Commercial Real Estate [Member]
Average Recorded Investment
Impaired Loans with No Related Allowance Recorded	2,521	1,860	2,747	2,063
Impaired Loans with an Allowance Recorded	5,745	6,906	6,207	6,970
Total	8,266	8,766	8,954	9,033
Interest Income Recognized
Impaired Loans with No Related Allowance Recorded	40	2	79	5
Impaired Loans with an Allowance Recorded	39	73	108	147
Total	79	75	187	152
Residential Real Estate [Member]
Average Recorded Investment
Impaired Loans with No Related Allowance Recorded	9,831	9,587	9,767	9,493
Impaired Loans with an Allowance Recorded	11,173	11,993	11,627	12,128
Total	21,004	21,580	21,394	21,621
Interest Income Recognized
Impaired Loans with No Related Allowance Recorded	159	37	297	71
Impaired Loans with an Allowance Recorded	84	100	197	185
Total	243	137	494	256
Construction and Land Development [Member]
Average Recorded Investment
Impaired Loans with No Related Allowance Recorded	538	214	431	179
Impaired Loans with an Allowance Recorded	279	634	197	702
Total	817	848	628	881
Interest Income Recognized
Impaired Loans with No Related Allowance Recorded	11	0	22	0
Impaired Loans with an Allowance Recorded	2	6	5	13
Total	13	6	27	13
Commercial And Financial [Member]
Average Recorded Investment
Impaired Loans with No Related Allowance Recorded	155	16	153	16
Impaired Loans with an Allowance Recorded	371	0	244	0
Total	526	16	397	16
Interest Income Recognized
Impaired Loans with No Related Allowance Recorded	6	0	7	0
Impaired Loans with an Allowance Recorded	3	0	7	0
Total	9	0	14	0
Consumer Portfolio Segment [Member]
Average Recorded Investment
Impaired Loans with No Related Allowance Recorded	154	183	105	212
Impaired Loans with an Allowance Recorded	311	356	204	353
Total	465	539	309	565
Interest Income Recognized
Impaired Loans with No Related Allowance Recorded	3	1	7	1
Impaired Loans with an Allowance Recorded	7	5	10	9
Total	$ 10	$ 6	$ 17	$ 10

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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