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FAIR VALUE MEASUREMENTS - Changes in Level 3 (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Commitments to lend |  |
Changes in Level 3 assets that were measured at fair value on a recurring basis |  |
Unrealized gains (losses) relating to instruments still held at the end of the period | $ 6,531 | $ 8,061
Derivative Asset (Liability) |  |
Beginning balance | 5,259 | 4,738
Unrealized (loss) gain, net recognized in other non-interest income | 12,213 | 17,302
Transfers to held for sale loans | (10,941) | (13,979)
Ending balance | 6,531 | 8,061
Forward Commitments |  |
Changes in Level 3 assets that were measured at fair value on a recurring basis |  |
Unrealized gains (losses) relating to instruments still held at the end of the period | 0 | (22)
Derivative Asset (Liability) |  |
Beginning balance | 19 | 100
Unrealized (loss) gain, net recognized in other non-interest income | (19) | (122)
Ending balance | 0 | (22)
Trading Security |  |
Changes in Level 3 assets that were measured at fair value on a recurring basis |  |
Balance at the beginning of the period | 12,277 | 13,229
Unrealized (loss) gain, net recognized in other non-interest income | (317) | (106)
Paydown of trading security | (165) | (157)
Balance at the end of the period | 11,795 | 12,966
Unrealized gains (losses) relating to instruments still held at the end of the period | 1,205 | 1,736
Capitalized Servicing Rights |  |
Changes in Level 3 assets that were measured at fair value on a recurring basis |  |
Balance at the beginning of the period | 3,834 | 798
Unrealized (loss) gain, net recognized in other non-interest income | 465 | (2)
Additions to servicing rights | 1,406 | 180
Balance at the end of the period | 5,705 | 976
Unrealized gains (losses) relating to instruments still held at the end of the period | $ 0 | $ 0

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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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