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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Change in Level 3 Assets and Liabilities) (Details 3) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) security | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
States and political subdivisions |  |  |
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 | $ 11,794 | $ 12,196 | $ 12,196
Principal payments received | (280) | (268) |
Unrealized net gain (loss) included in other comprehensive income | (370) | 170 |
Aggregate fair value / Balance at the end of the period |  |  | $ 11,794
Mortgage revenue bonds |  |  |
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis |  |  |
Aggregate fair value / Balance at the end of the period | $ 11,144 | $ 12,098 |
Additional disclosures |  |  |
Number of investment securities held | security | 4 |  |
Mortgage revenue bonds | Weighted average |  |  |
Additional disclosures |  |  |
Discount rate (as a percent) | 5.28% | 4.50% | 4.81%
Mortgage Servicing Rights |  |  |
Additional disclosures |  |  |
Discount rate (as a percent) | 9.50% | 9.50% | 9.50%
Forecasted constant prepayment rate | 14.00% | 16.50% | 16.00%

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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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