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SECURITIES - Available-for-sale Debt Securities by Contractual Maturity (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Available-for-sale Securities |  |
Due in one year or less, amortized cost | $ 14,667,000 |
Due in one year or less, fair value | 14,760,000 |
Due from one year through five years. amortized cost | 45,128,000 |
Due from one year through five years, fair value | 46,421,000 |
Due from five years through ten years, amortized cost | 51,245,000 |
Due from five years through ten years, fair value | 52,787,000 |
Due after ten years, amortized cost | 101,637,000 |
Due after ten years, fair value | 103,765,000 |
Sub-total, amortized cost | 212,677,000 |
Sub-total, fair value | 217,733,000 |
Total, amortized cost | 357,710,000 | $ 334,552,000
Total, fair value | 366,376,000 | 349,332,000
Investment Securities [Member] |  |
Available-for-sale Securities |  |
Investment pledged as collateral | 254,860,000 | 247,373,000
Residential Passthrough Securities |  |
Available-for-sale Securities |  |
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, amortized cost | 38,790,000 |
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, fair value | 39,757,000 |
Total, amortized cost | 38,790,000 | 36,853,000
Total, fair value | 39,757,000 | 38,176,000
Residential Collateralized Mortgage Obligations |  |
Available-for-sale Securities |  |
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, amortized cost | 52,715,000 |
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, fair value | 53,971,000 |
Total, amortized cost | 52,715,000 | 56,048,000
Total, fair value | 53,971,000 | $ 57,467,000
Commercial mortgage-backed securities |  |
Available-for-sale Securities |  |
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, amortized cost | 53,528,000 |
Mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored agencies, fair value | $ 54,915,000 |

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