DERIVATIVE FINANCIAL INSTRUMENTS (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($) item
Derivative Instruments and Hedging Activities Disclosures [Table]
Deterioration in the customer’s credit worthiness	$ 0	$ 0
Number of interest rate swap agreements | item	22	19
Other Assets. | Interest rate swaps with customers
Derivative Instruments and Hedging Activities Disclosures [Table]
Weighted Average Maturity	6 years 10 months 24 days
Other liabilities. | Interest rate swaps with financial institutions
Derivative Instruments and Hedging Activities Disclosures [Table]
Weighted Average Maturity	6 years 10 months 24 days
Not Designated as Hedging Instruments
Derivative Instruments and Hedging Activities Disclosures [Table]
Notional Amount	$ 288,202,000	$ 150,352,000
Not Designated as Hedging Instruments | Other Assets. | Interest rate swaps with customers
Derivative Instruments and Hedging Activities Disclosures [Table]
Notional amount asset	144,101,000	69,189,000
Fair value asset	$ 9,092,000	$ 2,599,000
Weighted Average Maturity	6 years 10 months 24 days	6 years 7 months 24 days
Not Designated as Hedging Instruments | Other Assets. | Interest rate swaps with financial institutions
Derivative Instruments and Hedging Activities Disclosures [Table]
Notional amount asset		$ 5,987,000
Fair value asset		$ 39,000
Weighted Average Maturity		6 years 8 months 16 days
Not Designated as Hedging Instruments | Other liabilities. | Interest rate swaps with customers
Derivative Instruments and Hedging Activities Disclosures [Table]
Notional amount liability		$ 5,987,000
Fair value liability		$ (39,000)
Weighted Average Maturity		6 years 8 months 16 days
Not Designated as Hedging Instruments | Other liabilities. | Interest rate swaps with financial institutions
Derivative Instruments and Hedging Activities Disclosures [Table]
Notional amount liability	$ 144,101,000	$ 69,189,000
Fair value liability	$ (9,092,000)	$ (2,599,000)
Weighted Average Maturity	6 years 10 months 24 days	6 years 7 months 24 days
Minimum | Not Designated as Hedging Instruments | Other Assets. | Interest rate swaps with customers
Derivative Instruments and Hedging Activities Disclosures [Table]
Fixed rate	3.25%	4.40%
Minimum | Not Designated as Hedging Instruments | Other Assets. | Interest rate swaps with financial institutions
Derivative Instruments and Hedging Activities Disclosures [Table]
Fixed rate		4.00%
Minimum | Not Designated as Hedging Instruments | Other liabilities. | Interest rate swaps with customers
Derivative Instruments and Hedging Activities Disclosures [Table]
Fixed rate		4.00%
Minimum | Not Designated as Hedging Instruments | Other liabilities. | Interest rate swaps with financial institutions
Derivative Instruments and Hedging Activities Disclosures [Table]
Fixed rate	3.25%	4.40%
Minimum | LIBOR | Not Designated as Hedging Instruments | Other Assets. | Interest rate swaps with customers
Derivative Instruments and Hedging Activities Disclosures [Table]
Floating rate	2.50%	2.50%
Minimum | LIBOR | Not Designated as Hedging Instruments | Other Assets. | Interest rate swaps with financial institutions
Derivative Instruments and Hedging Activities Disclosures [Table]
Floating rate		2.50%
Minimum | LIBOR | Not Designated as Hedging Instruments | Other liabilities. | Interest rate swaps with customers
Derivative Instruments and Hedging Activities Disclosures [Table]
Floating rate		2.50%
Minimum | LIBOR | Not Designated as Hedging Instruments | Other liabilities. | Interest rate swaps with financial institutions
Derivative Instruments and Hedging Activities Disclosures [Table]
Floating rate	2.50%	2.50%
Maximum | Not Designated as Hedging Instruments | Other Assets. | Interest rate swaps with customers
Derivative Instruments and Hedging Activities Disclosures [Table]
Fixed rate	5.89%	5.89%
Maximum | Not Designated as Hedging Instruments | Other liabilities. | Interest rate swaps with financial institutions
Derivative Instruments and Hedging Activities Disclosures [Table]
Fixed rate	5.89%	5.89%
Maximum | LIBOR | Not Designated as Hedging Instruments | Other Assets. | Interest rate swaps with customers
Derivative Instruments and Hedging Activities Disclosures [Table]
Floating rate	3.00%	3.00%
Maximum | LIBOR | Not Designated as Hedging Instruments | Other liabilities. | Interest rate swaps with financial institutions
Derivative Instruments and Hedging Activities Disclosures [Table]
Floating rate	3.00%	3.00%