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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 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | $ 326,646 | $ 341,628
Gross Unrealized Gain | 279 | 3,388
Gross Unrealized Loss | 20,221 | 2,810
Estimated Fair Value | 306,704 | 342,206
Held to maturity: |  |
Amortized Cost | 494,289 | 184,263
Gross Unrealized Gains | 1,997 | 8,364
Gross Unrealized Losses | 5,763 | 155
Estimated Fair Value | 490,523 | 192,472
U.S. government agencies |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 10,012 | 10,013
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | 731 | 42
Estimated Fair Value | 9,281 | 9,971
Corporate bonds |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 35,055 | 35,080
Gross Unrealized Gain | 86 | 940
Gross Unrealized Loss | 645 | 85
Estimated Fair Value | 34,496 | 35,935
Mortgage-backed securities |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 212,489 | 221,610
Gross Unrealized Gain | 131 | 1,477
Gross Unrealized Loss | 14,728 | 1,779
Estimated Fair Value | 197,892 | 221,308
Held to maturity: |  |
Amortized Cost | 32,287 | 2,953
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,534 | 37
Estimated Fair Value | 30,753 | 2,916
Collateralized mortgage obligations |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 69,090 | 74,925
Gross Unrealized Gain | 62 | 971
Gross Unrealized Loss | 4,117 | 904
Estimated Fair Value | 65,035 | 74,992
Municipal securities |  |
Held to maturity: |  |
Amortized Cost | 190,904 | 181,310
Gross Unrealized Gains | 1,997 | 8,364
Gross Unrealized Losses | 3,060 | 118
Estimated Fair Value | 189,841 | $ 189,556
Treasury securities |  |
Held to maturity: |  |
Amortized Cost | 271,098 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 1,169 |
Estimated Fair Value | $ 269,929 |

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