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SECURITIES AVAILABLE FOR SALE - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) security | Dec. 31, 2017 shares
Investment Holdings [Line Items] |  |
Gain on sale of shares | $ | $ 2,100,000 |
Visa Class B |  |
Investment Holdings [Line Items] |  |
Number of Visa Class shares owned (in shares) | shares |  | 15,542
Shares acquired from IPO (in shares) | shares |  | 11,623
Shares acquired through business combination (in shares) | shares |  | 3,919
US Government-sponsored enterprises |  |
Investment Holdings [Line Items] |  |
Debt securities in an unrealized loss position | 117 |
Available for sale securities portfolio, number of securities (security) | 194 |
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 2.70% |
Private label |  |
Investment Holdings [Line Items] |  |
Debt securities in an unrealized loss position | 15 |
Available for sale securities portfolio, number of securities (security) | 23 |
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 0.80% |
Municipal Bonds |  |
Investment Holdings [Line Items] |  |
Debt securities in an unrealized loss position | 118 |
Available for sale securities portfolio, number of securities (security) | 257 |
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 3.70% |
Material underlying credit downgrades | $ | $ 0 |
Obligations of states and political subdivisions thereof |  |
Investment Holdings [Line Items] |  |
Debt securities in an unrealized loss position | 451 |
Available for sale securities portfolio, number of securities (security) | 759 |
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 2.90% |
Corporate bonds |  |
Investment Holdings [Line Items] |  |
Debt securities in an unrealized loss position | 10 |
Available for sale securities portfolio, number of securities (security) | 21 |
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 2.40% |

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