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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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