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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Troubled Debt Restructurings Additional Information (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) loan	Dec. 31, 2018 loan	Dec. 31, 2019 USD ($)
Receivables [Abstract]
Commitments to lend to customers with outstanding loans classified as TDRs	$ 135		$ 135
Accruing TDRs	6,100		6,600
Nonaccruing TDRs	$ 20,900		$ 15,200
Number of loans modified that had payments default during the period | loan	0	0

X

- Definition

Financing Receivable, Modifications, Recorded Investment, Accrual Status

+ References

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- Definition

Financing Receivable, Modifications, Recorded Investment, Nonaccrual Status

+ References

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- Definition

Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524

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- Definition

Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18794-111554

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- References

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