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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 ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Economic undesignated hedges: |  |
Notional amount of derivatives | $ 178,993 | $ 188,081
Sale of TBA GNMA MBS pools [Member] |  |
Economic undesignated hedges: |  |
Notional amount of derivatives | 30,000 | 33,000
Forward loan sales commitments [Member] |  |
Economic undesignated hedges: |  |
Notional amount of derivatives | 3,869 | 6,339
Interest Rate Lock Commitments [Member] |  |
Economic undesignated hedges: |  |
Notional amount of derivatives | 10,104 | 11,722
Interest Rate Cap [Member] | Written |  |
Economic undesignated hedges: |  |
Notional amount of derivatives | 67,510 | 68,510
Interest Rate Cap [Member] | Purchase |  |
Economic undesignated hedges: |  |
Notional amount of derivatives | $ 67,510 | $ 68,510

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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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