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EQUITY SECURITIES - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Summary of Investment Holdings [Line Items] |  |  |  |  |
Capital stock par value | $ 100 |  | $ 100 |  |
Book value of investment in FHLB stock | $ 27,000 |  | $ 27,000 |  | $ 31,200
Market-to-market gain (loss) | 12,840 | $ 10,132 | 35,455 | $ 29,263 |
Equity Securities without Readily Determinable Fair Value, Amount | 37,427 |  | 37,427 |  | 37,588
Equity Securities [Member] |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Equity Securities, FV-NI | 5,400 |  | 5,400 |  | 1,500
Market-to-market gain (loss) | (37) | (3) | (42) | 40 |
Equity Securities without Readily Determinable Fair Value, Amount | 5,000 |  | 5,000 |  | $ 4,900
Investment in Federal Home Loan Bank Stock [Member] |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Dividend income from FHLB stock | $ 300 | $ 400 | $ 1,100 | $ 1,500 |

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