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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 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | $ 341,628 | $ 363,097
Gross Unrealized Gain | 3,388 | 17,794
Gross Unrealized Loss | 2,810 | 96
Estimated Fair Value | 342,206 | 380,795
Held to maturity: |  |
Amortized Cost | 184,263 | 0
Gross Unrealized Gains | 8,364 |
Gross Unrealized Losses | 155 |
Estimated Fair Value | 192,472 |
U.S. government agencies |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 10,013 |
Gross Unrealized Gain | 0 |
Gross Unrealized Loss | 42 |
Estimated Fair Value | 9,971 |
Corporate bonds |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 35,080 | 29,608
Gross Unrealized Gain | 940 | 1,382
Gross Unrealized Loss | 85 | 8
Estimated Fair Value | 35,935 | 30,982
Mortgage-backed securities |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 221,610 | 104,210
Gross Unrealized Gain | 1,477 | 3,041
Gross Unrealized Loss | 1,779 | 87
Estimated Fair Value | 221,308 | 107,164
Held to maturity: |  |
Amortized Cost | 2,953 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 37 |
Estimated Fair Value | 2,916 |
Collateralized mortgage obligations |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 74,925 | 64,611
Gross Unrealized Gain | 971 | 2,335
Gross Unrealized Loss | 904 | 1
Estimated Fair Value | 74,992 | 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 | 181,310 |
Gross Unrealized Gains | 8,364 |
Gross Unrealized Losses | 118 |
Estimated Fair Value | $ 189,556 |

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