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INVESTMENTS (Narrative) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Trading securities | $ 4,354 |  | $ 4,354 |  |  | $ 4,161 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  |  | 0 |  |
Net unrealized gain on available-for-sale debt securities, net of tax | 14,097 | $ 29,310 | 14,097 | $ 29,310 | $ 11,801 | 29,310 | $ 22,180 | $ 3,250
Deferred tax assets, unrealized losses on available for sale securities | 3,900 |  | 3,900 |  |  | 8,000 |  |
Debt Securities, Available-for-sale, Realized Gain (Loss) | 0 | $ 0 | 0 | $ 0 |  |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 |  | 0 |  |  | 0 |  |
Debt Securities, Held-to-Maturity, Excluded Accrued Interest from Amortized Cost | 10 |  | 10 |  |  | 10 |  |
Security pledged as collateral, amortized cost | 500,800 |  | 500,800 |  |  | 485,000 |  |
Security pledged as collateral, fair value | 512,900 |  | 512,900 |  |  | 507,100 |  |
Available-for-sale Securities |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Interest Receivable | $ 3,300 |  | $ 3,300 |  |  | $ 3,100 |  |

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