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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Assets and Liabilitie (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 30, 2019	Mar. 31, 2019
Derivative [Line Items]
Notional Amount	$ 580,372	$ 182,239
Fair Value Asset (Liability)	(743)	811
Amount of Gain (Loss) Recognized in Other Comprehensive Income	1,768	486	$ (838)
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	3,156	0
Amount of Gain (Loss) Recognized in Income	(630)	(510)
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	21,748	92,239
Fair Value Asset (Liability)	59	8
Amount of Gain (Loss) Recognized in Other Comprehensive Income		0
Not Designated as Hedging Instrument | Interest rate lock commitments
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income	0	0
Not Designated as Hedging Instrument | Customer loan derivative liability
Derivative [Line Items]
Notional Amount		$ 45,641
Weighted Average Maturity		9 years 10 months 24 days
Fair Value Asset (Liability)		$ (1,353)
Not Designated as Hedging Instrument | Customer loan derivative asset
Derivative [Line Items]
Notional Amount		$ 45,641
Weighted Average Maturity		9 years 10 months 24 days
Fair Value Asset (Liability)		$ 1,353
Cash Flow Hedges | Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	100,000	90,000
Fair Value Asset (Liability)	(1,311)	803
Amount of Gain (Loss) Recognized in Other Comprehensive Income	2,291	486
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swap on deposits
Derivative [Line Items]
Notional Amount				$ 50,000	$ 50,000
Amount of Gain (Loss) Recognized in Other Comprehensive Income	2,291
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate caps agreements
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income	0	486
Fair Value Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	37,190
Fair Value Asset (Liability)	593
Amount of Gain (Loss) Recognized in Other Comprehensive Income	(523)
Fair Value Hedging | Designated as Hedging Instrument | Interest rate swap on deposits
Derivative [Line Items]
Notional Amount	37,200
Fair Value Hedging | Designated as Hedging Instrument | Interest rate swap on securities
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income	(523)
Economic hedges: | Designated as Hedging Instrument
Derivative [Line Items]
Notional Amount	421,434
Fair Value Asset (Liability)	(84)
Amount of Gain (Loss) Recognized in Other Comprehensive Income	0	0
Economic hedges: | Designated as Hedging Instrument | Forward sale commitments
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income	0	0
Economic hedges: | Designated as Hedging Instrument | Customer Loan Swaps - MNA Counterparty
Derivative [Line Items]
Notional Amount	$ 135,598
Weighted Average Maturity	7 years 6 months
Fair Value Asset (Liability)	$ (4,669)
Economic hedges: | Designated as Hedging Instrument | Customer Loan Swaps - RPA Counterparty
Derivative [Line Items]
Notional Amount	$ 69,505
Weighted Average Maturity	8 years 9 months 18 days
Fair Value Asset (Liability)	$ (3,377)
Economic hedges: | Designated as Hedging Instrument | Customer Loan Swaps - Customer
Derivative [Line Items]
Notional Amount	$ 205,103
Weighted Average Maturity	8 years 1 month 6 days
Fair Value Asset (Liability)	$ 8,046
Other liabilities | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swap on deposits
Derivative [Line Items]
Notional Amount	$ 100,000
Weighted Average Maturity	4 years 7 months 6 days
Fair Value Asset (Liability)	$ (1,311)
Other liabilities | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate caps agreements
Derivative [Line Items]
Notional Amount		$ 90,000
Weighted Average Maturity		4 years 1 month 6 days
Fair Value Asset (Liability)		$ 803
Other liabilities | Fair Value Hedging | Designated as Hedging Instrument | Interest rate swap on securities
Derivative [Line Items]
Notional Amount	$ 37,190
Weighted Average Maturity	9 years 7 months 6 days
Fair Value Asset (Liability)	$ 593
Other liabilities | Economic hedges: | Designated as Hedging Instrument | Forward sale commitments
Derivative [Line Items]
Notional Amount	$ 11,228
Weighted Average Maturity	1 month 6 days
Fair Value Asset (Liability)	$ (84)
Other assets | Not Designated as Hedging Instrument | Interest rate lock commitments
Derivative [Line Items]
Notional Amount	$ 21,748	$ 957
Weighted Average Maturity	1 month 6 days	1 month 6 days
Fair Value Asset (Liability)	$ 59	$ 8
Securities Available for Sale | Fair Value Hedging | Interest rate swap on securities
Derivative [Line Items]
Carrying Amount of Hedged Assets (Liabilities)	39,026	0
Cumulative Amount of Fair Value Hedging Adjustment in Carrying Amount	523	0
Acquisition, restructuring, and other expenses | Cash Flow Hedges | Designated as Hedging Instrument
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income		0
Acquisition, restructuring, and other expenses | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate caps agreements
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	3,156	0
Interest expense | Cash Flow Hedges | Designated as Hedging Instrument
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	3,156
Interest expense | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swap on deposits
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	0
Interest income | Fair Value Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	0
Interest income | Fair Value Hedging | Designated as Hedging Instrument | Interest rate swap on securities
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	0
Other income | Not Designated as Hedging Instrument
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income		0
Other income | Not Designated as Hedging Instrument | Interest rate lock commitments
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	0	0
Other income | Economic hedges: | Designated as Hedging Instrument
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	0	0
Other income | Economic hedges: | Designated as Hedging Instrument | Forward sale commitments
Derivative [Line Items]
Amount of Gain (Loss) Reclassified from Other Comprehensive Income	0	0
Interest expense | Cash Flow Hedges | Designated as Hedging Instrument
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income	(605)	(519)
Interest expense | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swap on deposits
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income	(2)
Interest expense | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate caps agreements
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income	(603)	(519)
Interest income | Fair Value Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income	7
Interest income | Fair Value Hedging | Designated as Hedging Instrument | Interest rate swap on securities
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income	7
Other income | Not Designated as Hedging Instrument
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income		9
Other income | Not Designated as Hedging Instrument | Interest rate lock commitments
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income	52	9
Other income | Economic hedges: | Designated as Hedging Instrument
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income	(84)	0
Other income | Economic hedges: | Designated as Hedging Instrument | Forward sale commitments
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income	$ (84)	$ 221

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