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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Economic Hedges and Non-hedging Derivatives (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Hedging derivatives | Economic Hedging | Interest Rate Swap | Industrial Revenue Bond |  |
Derivative [Line Items] |  |
Unrealized gain (loss) recognized in other non-interest income | $ (75) | $ (344)
Hedging derivatives | Economic Hedging | Interest Rate Swap | Commercial loan |  |
Derivative [Line Items] |  |
Unrealized gain (loss) recognized in other non-interest income | 1,312 | (4,852)
Hedging derivatives | Economic Hedging | Reverse Interest Rate Swaps | Commercial loan |  |
Derivative [Line Items] |  |
Unrealized gain (loss) recognized in other non-interest income | (1,312) | 4,852
Favorable (unfavorable) change in credit valuation adjustment recognized in other non-interest income | 338 | (51)
Hedging derivatives | Economic Hedging | Risk Participation Agreements |  |
Derivative [Line Items] |  |
Unrealized gain (loss) recognized in other non-interest income | (61) | (36)
Hedging derivatives | Economic Hedging | Forward Commitments |  |
Derivative [Line Items] |  |
Unrealized gain (loss) recognized in other non-interest income | (1,176) | (247)
Realized gain (loss) in other non-interest income | (3,705) | 45
Non-hedging derivatives | Interest rate lock commitments |  |
Derivative [Line Items] |  |
Unrealized gain (loss) recognized in other non-interest income | 8,373 | 2,436
Realized gain (loss) in other non-interest income | $ 3,650 | $ 1,899

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- Definition The favorable changes in credit valuation adjustments on derivative instruments that were recognized in other non-interest income during the current period. + References No definition available. + Details
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- Definition Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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