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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 |

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- Definition Financing Receivable, Modifications, Recorded Investment, Nonaccrual Status + References No definition available. + Details
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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 + Details
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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 + Details
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- References No definition available. + Details
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