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INVESTMENTS (Narrative) (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Investments [Line Items] |  |  |  |
Net unrealized gain on available-for-sale debt securities, net of tax | $ 22,180 | $ (6,927) | $ 3,250 | $ (17,826)
Deferred tax assets, unrealized losses on available for sale securities | $ 6,100 |  | 900 |
Unrealized Loss as a Percent of Fair Value | 1.00% |  |  |
Security pledged as collateral, amortized cost | $ 712,400 |  | 709,000 |
Security pledged as collateral, fair value | 735,300 |  | $ 712,400 |
Unrealized loss, change in fair value of bank stock equity securities | 0 | 243 |  |
Debt Securities, Available-for-sale, Realized Gain (Loss) | $ 0 | $ 0 |  |

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