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DERIVATIVES - (Schedule of Information about Interest Rate Swaps Designated as Cash Flow Hedges) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2021 USD ($) N	Dec. 31, 2020 USD ($) N
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	$ 270,000,000.0	$ 270,000,000.0
Fair Value	$ (8,166,000)	$ (9,616,000)
Weighted average pay rate	1.93%	1.93%
Weighted average receive rate	0.20%	0.22%
Weighted average maturity	1 year 9 months 10 days	2 years 7 days
Unrealized loss, net	$ (8,166,000)	$ (9,616,000)
Number of contracts | N	13	13
Loan Level Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	$ 789,673,000	$ 823,134,000
Fair Value	$ 45,301,000	$ 79,529,000
Weighted average pay rate	4.05%	4.02%
Weighted average receive rate	1.89%	1.91%
Weighted average maturity	6 years 1 month 17 days	6 years 6 months
Number of contracts | N	93	95

X

- Definition

Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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- Definition

Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

+ References

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- Definition

Amount of unrealized gain (loss) related to derivatives designated as cash flow hedging instruments, recorded in results of operations to the extent that the cash flow hedge is determined to be ineffective.

+ References

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