FAIR VALUE - Schedule of Quantitative Information About Nonrecurring Level 3 Fair Value Measurements (Details) $ in Thousands	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Assets at fair value on a nonrecurring basis:
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	$ 8,131	$ 10,863
Other real estate owned	632	751
Assets at fair value on a nonrecurring basis: | Significant Other Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	8,131	10,863
Other real estate owned	632	751
Cost to Sell | Impaired loans | Fair value of collateral- sales comparison approach | Assets at fair value on a nonrecurring basis: | Significant Other Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	8,131	10,863
Cost to Sell | Other real estate owned | Appraisal value of collateral | Assets at fair value on a nonrecurring basis: | Significant Other Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned	$ 632	$ 751
Minimum | Cost to Sell | Other real estate owned | Appraisal value of collateral
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned, input (percent)	0.10	0.10
Minimum | Cost to Sell | Real Estate | Impaired loans | Fair value of collateral- sales comparison approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans, input (percent)	0.10	0.10
Minimum | Cost to Sell | Equipment | Impaired loans | Fair value of collateral- sales comparison approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans, input (percent)	0.10	0.10
Maximum | Cost to Sell | Other real estate owned | Appraisal value of collateral
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned, input (percent)	0.20	0.20
Maximum | Cost to Sell | Real Estate | Impaired loans | Fair value of collateral- sales comparison approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans, input (percent)	0.20	0.20
Maximum | Cost to Sell | Equipment | Impaired loans | Fair value of collateral- sales comparison approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans, input (percent)	0.20	0.20
Weighted Average | Cost to Sell | Other real estate owned | Appraisal value of collateral
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other real estate owned, input (percent)	0.16	0.16
Weighted Average | Cost to Sell | Real Estate | Impaired loans | Fair value of collateral- sales comparison approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans, input (percent)	0.16	0.16
Weighted Average | Cost to Sell | Equipment | Impaired loans | Fair value of collateral- sales comparison approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans, input (percent)	0.12	0.19