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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Economic Hedges and Non-hedging Derivatives (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Interest rate swaps | Economic hedges | Industrial revenue bond |  |
Derivative [Line Items] |  |
Unrealized gain recognized in other non-interest income | $ 311 | $ 122
Interest rate swaps | Economic hedges | Loans with commercial loan customers |  |
Derivative [Line Items] |  |
Unrealized gain recognized in other non-interest income | 14,669 | 1,098
Reverse interest rate swaps | Economic hedges | Loans with commercial loan customers |  |
Derivative [Line Items] |  |
Unrealized gain recognized in other non-interest income | (14,669) | (1,098)
(Unfavorable) Favorable change in credit valuation adjustment recognized in other non-interest income | 237 | (162)
Risk participation agreements with dealer banks | Economic hedges |  |
Derivative [Line Items] |  |
Unrealized gain recognized in other non-interest income | 16 | (18)
Forward sale commitments | Economic hedges |  |
Derivative [Line Items] |  |
Unrealized gain recognized in other non-interest income | (909) | (1,251)
Realized gain (loss) in other non-interest income | 3,922 | (2,906)
Commitments to lend | Non-hedging derivatives |  |
Derivative [Line Items] |  |
Unrealized gain recognized in other non-interest income | 6,531 | 8,061
Realized gain (loss) in other non-interest income | $ 603 | $ 8,774

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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=84234895&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=84234895&loc=SL5624171-113959 + Details
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