EMPLOYEE BENEFITS - Schedule of Shares Issued in Connection with Stock Compensation Awards (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New shares issued (in shares)	140,692	159,356	108,225
Proceeds from stock options exercised	$ 2,653	$ 2,692	$ 1,663
New shares issued from authorized shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New shares issued (in shares)	0	48,311	108,225
New shares issued from available treasury shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
New shares issued (in shares)	140,692	111,045	0

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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Number of share instruments newly issued under a share-based compensation plan.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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