DERIVATIVE FINANCIAL INSTRUMENTS - Fair Value of Derivative Instruments (Details) $ in Thousands	Mar. 31, 2019 USD ($) instrument
Derivative [Line Items]
Notional	$ 402,731
Total derivatives	(1,295)
Designated as Hedging Instrument
Derivative [Line Items]
Notional	75,000
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	327,731
Total derivatives	1,105
Other Liabilities | Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability	(2,400)
Interest rate products | Other Assets | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	81,583
Derivative Asset	$ 2,610
Interest rate products | Other Liabilities | Designated as Hedging Instrument
Derivative [Line Items]
Count | instrument	3
Notional	$ 75,000
Derivative Liability	(2,400)
Interest rate products | Other Liabilities | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	81,583
Derivative Liability	(2,706)
Risk participation agreements | Other Liabilities | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	7,758
Derivative Liability	(4)
Interest rate lock commitments with customers | Other Assets | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	75,760
Derivative Asset	1,288
Interest rate lock commitments with customers | Other Liabilities | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	5,169
Derivative Liability	(12)
Forward sale commitments | Other Assets | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	27,180
Derivative Asset	122
Forward sale commitments | Other Liabilities | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional	48,698
Derivative Liability	$ (193)