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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Notional Amounts of All Derivative Instruments (Detail) - Not Designated as Hedging Instrument, Economic Hedge [Member] - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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Economic undesignated hedges: |  |
Notional amount of derivatives | $ 212,025,000 | $ 208,020,000
Forward Contracts [Member] |  |
Economic undesignated hedges: |  |
Notional amount of derivatives | 28,000,000 | 26,000,000
Forward loan sales commitments [Member] |  |
Economic undesignated hedges: |  |
Notional amount of derivatives | 5,005,000 | 0
Interest Rate Cap [Member] | Written |  |
Economic undesignated hedges: |  |
Notional amount of derivatives | 89,510,000 | 91,010,000
Interest Rate Cap [Member] | Purchase |  |
Economic undesignated hedges: |  |
Notional amount of derivatives | $ 89,510,000 | $ 91,010,000

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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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