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MARKETABLE SECURITIES - Schedule of Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Available for sale: |  |  |
Available-for-sale debt securities, amortized cost basis | $ 265,236 | $ 265,236 | $ 363,097
Gross Unrealized Gain | 4,827 |  | 17,794
Gross Unrealized Loss | 993 |  | 96
Estimated Fair Value | 269,070 |  | 380,795
Held to maturity: |  |  |
Amortized Cost | 173,676 |  | 0
Gross Unrealized Gains | 9,139 |  |
Gross Unrealized Losses | 184 |  |
Estimated Fair Value | 182,631 |  |
U.S. government agencies |  |  |
Available for sale: |  |  |
Available-for-sale debt securities, amortized cost basis | 10,013 |  |
Gross Unrealized Gain | 46 |  |
Gross Unrealized Loss | 0 |  |
Estimated Fair Value | 10,059 |  |
Corporate bonds |  |  |
Available for sale: |  |  |
Available-for-sale debt securities, amortized cost basis | 34,105 |  | 29,608
Gross Unrealized Gain | 1,233 |  | 1,382
Gross Unrealized Loss | 92 |  | 8
Estimated Fair Value | 35,246 |  | 30,982
Mortgage-backed securities |  |  |
Available for sale: |  |  |
Available-for-sale debt securities, amortized cost basis | 157,846 |  | 104,210
Gross Unrealized Gain | 2,143 |  | 3,041
Gross Unrealized Loss | 847 |  | 87
Estimated Fair Value | 159,142 |  | 107,164
Held to maturity: |  |  |
Amortized Cost | 3,042 |  |
Gross Unrealized Gains | 0 |  |
Gross Unrealized Losses | 37 |  |
Estimated Fair Value | 3,005 |  |
Collateralized mortgage obligations |  |  |
Available for sale: |  |  |
Available-for-sale debt securities, amortized cost basis | 63,272 |  | 64,611
Gross Unrealized Gain | 1,405 |  | 2,335
Gross Unrealized Loss | 54 |  | 1
Estimated Fair Value | 64,623 |  | 66,945
Municipal securities |  |  |
Available for sale: |  |  |
Available-for-sale debt securities, amortized cost basis |  |  | 164,668
Gross Unrealized Gain |  |  | 11,036
Gross Unrealized Loss |  |  | 0
Estimated Fair Value |  |  | $ 175,704
Held to maturity: |  |  |
Amortized Cost | 170,634 |  |
Gross Unrealized Gains | 9,139 |  |
Gross Unrealized Losses | 147 |  |
Estimated Fair Value | $ 179,626 |  |

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