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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 | Sep. 30, 2021 | Dec. 31, 2020
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Economic undesignated hedges: |  |
Notional amount of derivatives | $ 96,208 | $ 126,793
Interest Rate Lock Commitments [Member] |  |
Economic undesignated hedges: |  |
Notional amount of derivatives | 14,390 | 19,931
Forward loan sales commitments [Member] |  |
Economic undesignated hedges: |  |
Notional amount of derivatives | 9,409 | 19,998
Sale of TBA GNMA MBS pools [Member] |  |
Economic undesignated hedges: |  |
Notional amount of derivatives | 30,000 | 42,000
Interest Rate Cap [Member] | Written |  |
Economic undesignated hedges: |  |
Notional amount of derivatives | 14,500 | 14,500
Interest Rate Cap [Member] | Purchase |  |
Economic undesignated hedges: |  |
Notional amount of derivatives | 14,500 | 14,500
Interest Rate Swap [Member] |  |
Economic undesignated hedges: |  |
Notional amount of derivatives | $ 13,409 | $ 15,864

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