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INVESTMENTS (Narrative) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Schedule of Investments [Line Items] |  |  |  |  |
Trading securities | $ 4,335 |  | $ 4,335 |  | $ 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 | 8,958 |  | 8,958 |  | 29,310
Deferred tax assets, unrealized losses on available for sale securities | 2,500 |  | 2,500 |  | 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 | 8 |  | 8 |  | 10
Security pledged as collateral, amortized cost | 720,400 |  | 720,400 |  | 485,000
Security pledged as collateral, fair value | 728,900 |  | 728,900 |  | 507,100
Available-for-sale Securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Interest Receivable | $ 3,500 |  | $ 3,500 |  | $ 3,100

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