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LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) contract	Mar. 31, 2018 USD ($) contract	Dec. 31, 2018 USD ($) contract
Financing Receivable, Modifications [Line Items]
Total	$ 1,158		$ 1,196
Specific reserves on TDRs	$ 0		$ 0
Troubled Debt Restructurings:
Number of Contracts | contract	0	2	4
Pre-Modification Outstanding Recorded Investment	$ 0	$ 93	$ 582
Post-Modification Outstanding Recorded Investment	$ 0	$ 93	$ 582
Commercial and industrial
Troubled Debt Restructurings:
Number of Contracts | contract		1	3
Pre-Modification Outstanding Recorded Investment		$ 15	$ 504
Post-Modification Outstanding Recorded Investment		$ 15	$ 504
1-4 family residential
Troubled Debt Restructurings:
Number of Contracts | contract	0	1	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 78	$ 78
Post-Modification Outstanding Recorded Investment	$ 0	$ 78	78
Farmland
Troubled Debt Restructurings:
Number of Contracts | contract	0
Pre-Modification Outstanding Recorded Investment	$ 0
Post-Modification Outstanding Recorded Investment	0
Nonaccrual TDRs
Financing Receivable, Modifications [Line Items]
Total	487		335
Performing TDRs
Financing Receivable, Modifications [Line Items]
Total	$ 671		$ 861

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Troubled Debt Restructuring [Abstract]

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Amount of allowance for credit losses related to receivables which had been measured under a general allowance for credit losses methodology that are now identified as troubled debt restructurings.

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Number of financing receivables that have been modified by troubled debt restructurings.

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-Topic 310
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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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