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FAIR VALUE - Gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | $ 41,090 | $ 62,294
Less than 12 months Unrealized Loss | 492 | 1,155
12 months or more Fair Value | 15,156 | 10,589
12 months or more Unrealized Loss | 411 | 293
Total Fair Value | 56,246 | 72,883
Total Unrealized Loss | 903 | 1,448
US Treasury |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 499 |
Less than 12 months Unrealized Loss | 1 |
Total Fair Value | 499 |
Total Unrealized Loss | 1 |
Agency |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 1,992 |
Less than 12 months Unrealized Loss | 7 |
12 months or more Fair Value | 848 | 986
12 months or more Unrealized Loss | 12 | 16
Total Fair Value | 2,840 | 986
Total Unrealized Loss | 19 | 16
State and municipal |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 5,133 | 19,200
Less than 12 months Unrealized Loss | 62 | 580
12 months or more Fair Value | 4,862 |
12 months or more Unrealized Loss | 167 |
Total Fair Value | 9,995 | 19,200
Total Unrealized Loss | 229 | 580
Mortgage-backed |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 33,466 | 43,094
Less than 12 months Unrealized Loss | 422 | 575
12 months or more Fair Value | 9,446 | 9,603
12 months or more Unrealized Loss | 232 | 277
Total Fair Value | 42,912 | 52,697
Total Unrealized Loss | $ 654 | $ 852

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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