DERIVATIVES - Additional Information (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) loan	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) derivative	Mar. 31, 2016
Derivative [Line Items]
Number of FHLB borrowings | loan	4
Amount of four FHLB borrowings	$ 26,000,000
Hedge ineffectiveness	0	$ 0
Reclassifications to interest expense	59,000	24,000
Pledged collateral	1,400,000
Obligation to return before cash reclaimed	550,000	$ 2,800,000
Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	$ 153,500,000		$ 113,500,000
Derivative Effective Date September 15, 2018 Contract 1 | Derivatives designated as hedging instruments
Derivative [Line Items]
Fixed interest rate of swap agreement	2.89%
Notional amount	$ 20,000,000		20,000,000
Derivative Effective Date September 15, 2018 Contract 3 | Derivatives designated as hedging instruments
Derivative [Line Items]
Fixed interest rate of swap agreement	2.85%
Notional amount	$ 17,500,000		17,500,000
Derivative Effective Date March 15, 2016 | Derivatives designated as hedging instruments
Derivative [Line Items]
Swap agreement term	10 years
Fixed interest rate of swap agreement				3.10%
Notional amount	$ 12,500,000		12,500,000
Interest Rate Swaps
Derivative [Line Items]
Amount of four FHLB borrowings			$ 75,000,000
Number of derivatives | derivative			4
Derivative Effective Date September 15, 2018 Contract 2 | Derivatives designated as hedging instruments
Derivative [Line Items]
Fixed interest rate of swap agreement	2.90%
Notional amount	$ 20,000,000		$ 20,000,000
Derivative Effective Date September 15, 2018 Contract 4 | Derivatives designated as hedging instruments
Derivative [Line Items]
Fixed interest rate of swap agreement	2.86%
Notional amount	$ 17,500,000		$ 17,500,000
Junior subordinated debt
Derivative [Line Items]
Variable rate junior subordinated debt issued	$ 12,500,000.0
Junior subordinated debt | LIBOR
Derivative [Line Items]
Variable rate spread on debt instrument	1.44%
Cash flow hedging | Interest Rate Swaps
Derivative [Line Items]
Swap agreement term	3 years
Fixed interest rate of swap agreement	2.56%
Notional amount	$ 40,000,000
Cash flow hedging | Interest Rate Swaps | Certificates of Deposit
Derivative [Line Items]
Notional amount	$ 40,000,000