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SHORT-TERM BORROWINGS - Summary of the Use of Short-Term Borrowings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Balance at year-end	$ 55,000	$ 50,000	$ 52,000
Weighted average interest rate at year-end	2.76%	1.21%	0.76%
Average balance during the year	$ 71,457	$ 54,610	$ 17,841
Average interest rate during the year	2.09%	1.08%	0.61%
Maximum month-end balance during the year	$ 103,000	$ 72,000	$ 52,000

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- Definition

The average effective interest rate during the reporting period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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-SubTopic 10
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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period.

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
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Short term borrowings other than repurchase agreements.

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