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FAIR VALUE OF ASSETS AND LIABILITIES (Level 3 Assets and Liabilities) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) bond | Dec. 31, 2016 USD ($)
States and political subdivisions |  |
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis |  |
Principal payments received | $ (358) | $ (338)
Purchases |  | 0
Unrealized net loss included in other comprehensive gain | (44) | 55
Mortgage revenue bonds |  |
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis |  |
Aggregate fair value / Balance at the beginning of the period | 12,196 | 12,479
Aggregate fair value / Balance at the end of the period | $ 11,794 | $ 12,196
Additional disclosures |  |
Number of investment securities held | bond | 4 |
Mortgage revenue bonds | Weighted average |  |
Additional disclosures |  |
Discount rate | 4.81% |

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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