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SECURITIES AVAILABLE FOR SALE - Basis for Impairment Conclusion (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) security | Jan. 01, 2021 USD ($)
Investment Holdings [Line Items] |  |
Allowance on AFS debt securities | $ | $ 0 | $ 0
Accounting Standards Update 2016-13 |  |
Investment Holdings [Line Items] |  |
Allowance on AFS debt securities | $ | $ 0 |
US Government-sponsored enterprises |  |
Investment Holdings [Line Items] |  |
Available-for-sale, securities in unrealized loss positions (security) | 49 |
Available for sale securities portfolio, number of securities (security) | 528 |
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage) | 1.07% |
US Government agency |  |
Investment Holdings [Line Items] |  |
Available-for-sale, securities in unrealized loss positions (security) | 11 |
Available for sale securities portfolio, number of securities (security) | 150 |
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage) | 0.45% |
Private label |  |
Investment Holdings [Line Items] |  |
Available-for-sale, securities in unrealized loss positions (security) | 14 |
Available for sale securities portfolio, number of securities (security) | 31 |
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage) | 0.18% |
Obligations of states and political subdivisions thereof |  |
Investment Holdings [Line Items] |  |
Available-for-sale, securities in unrealized loss positions (security) | 12 |
Available for sale securities portfolio, number of securities (security) | 119 |
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage) | 0.52% |
Corporate bonds |  |
Investment Holdings [Line Items] |  |
Available-for-sale, securities in unrealized loss positions (security) | 4 |
Available for sale securities portfolio, number of securities (security) | 27 |
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses (percentage) | 0.78% |

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