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SECURITIES, Amortized Cost and Fair Value of Securities Held-to-maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Held-to-maturity, Maturity, Amortized Cost [Abstract] |  |
Amortized Cost | $ 11,137 | $ 10,020
Gross Unrealized Gains | 275 | 324
Gross Unrecognized Losses | (36) | 0
Estimated Fair Value | 11,376 | 10,344
Obligations of States and Political Subdivisions [Member] |  |
Debt Securities, Held-to-maturity, Maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 11,135 | 10,018
Gross Unrealized Gains | 275 | 324
Gross Unrecognized Losses | (36) | 0
Estimated Fair Value | 11,374 | 10,342
Agency Mortgage-backed Securities, Residential [Member] |  |
Debt Securities, Held-to-maturity, Maturity, Amortized Cost [Abstract] |  |
Amortized Cost | 2 | 2
Gross Unrealized Gains | 0 | 0
Gross Unrecognized Losses | 0 | 0
Estimated Fair Value | $ 2 | $ 2

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