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INVESTMENT AND MORTGAGE-BACKED SECURITIES - Securities Held-to-maturity Major Categories (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 40,303,000 |
Fair Value | 40,303,000 | $ 0
Pass-through MBS issued by GSEs |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 25,325,000 |
Fair Value | 25,325,000 |
Agency Collateralized Mortgage Obligations ("CMOs") |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 14,978,000 |
Fair Value | $ 14,978,000 |

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