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DERIVATIVE INSTRUMENTS - Additional Information (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 30, 2015 | Sep. 30, 2013
Interest Rate Swap Maturing on September 27, 2018 | Cash Flow Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivatives, notional amount |  |  |  |  | $ 50,000,000
Derivative, notional amount terminated |  | $ 75,000,000 |  |  |
Interest Rate Swap Maturing on January 30, 2022 | Cash Flow Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivatives, notional amount |  |  |  | $ 25,000,000 |
Interest rate swaps on deposits and other borrowings |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivatives asset, fair values |  |  | $ 918,000 |  |
Gain (Loss) on Securitization of Financial Assets |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (loss) on derivatives | $ (12,400,000) | 2,200,000 | $ (8,000,000) |  |
Other Assets |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivatives asset, fair values | 1,005,000 | 17,968,000 |  |  |
Other Assets | Foreign exchange contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivatives asset, fair values | $ 0 | $ 47,000 |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying 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 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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