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SECURITIES - Securities with gross unrealized losses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Investment securities |  |
Fair value - Less than twelve months | $ 73,153 | $ 134,561
Gross Unrealized loss - Less than twelve months | (561) | (2,658)
Fair value - Twelve months or more | 62,560 | 313
Gross Unrealized loss - Twelve months or more | (1,485) | (3)
State and municipal securities |  |
Investment securities |  |
Fair value - Less than twelve months | 2,494 | 22,856
Gross Unrealized loss - Less than twelve months | (3) | (647)
Fair value - Twelve months or more | 6,516 | 313
Gross Unrealized loss - Twelve months or more | (115) | (3)
Debt securities |  |
Investment securities |  |
Fair value - Less than twelve months | 4,464 | 18,341
Gross Unrealized loss - Less than twelve months | (55) | (454)
Fair value - Twelve months or more | 12,481 |
Gross Unrealized loss - Twelve months or more | (315) |
Collateralized mortgage obligations |  |
Investment securities |  |
Fair value - Less than twelve months | 44,116 | 24,800
Gross Unrealized loss - Less than twelve months | (380) | (325)
Fair value - Twelve months or more | 9,938 |
Gross Unrealized loss - Twelve months or more | (295) |
Mortgage-backed securities |  |
Investment securities |  |
Fair value - Less than twelve months | 22,079 | 67,500
Gross Unrealized loss - Less than twelve months | (123) | (1,215)
Fair value - Twelve months or more | 32,538 |
Gross Unrealized loss - Twelve months or more | (743) |
Other securities |  |
Investment securities |  |
Fair value - Less than twelve months |  | 1,064
Gross Unrealized loss - Less than twelve months |  | $ (17)
Fair value - Twelve months or more | 1,087 |
Gross Unrealized loss - Twelve months or more | $ (17) |

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a 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 + Details
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- Definition Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months. + 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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