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SHORT-TERM BORROWINGS - Summary of the Use of Securities Sold Under Agreements to Repurchase (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Balance at year-end	$ 43,576	$ 35,864	$ 29,156
Weighted average interest rate at year-end	0.56%	0.20%	0.20%
Average balance during the year	$ 43,205	$ 38,546	$ 30,156
Average interest rate during the year	0.45%	0.20%	0.20%
Maximum month-end balance during the year	$ 55,270	$ 52,693	$ 37,558
Fair value of securities underlying the agreements at year-end	$ 53,485	$ 56,201	$ 35,470

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- Definition

Assets sold under agreements to repurchase average interest rate during period.

+ References

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- Definition

Assets sold under agreements to repurchase average outstanding amount.

+ References

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- Definition

Assets sold under agreements to repurchase maximum month end outstanding amount.

+ References

No definition available.

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- Definition

Assets Sold Under Agreements To Repurchase, Weighted Average Interest

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- Definition

Securities held under agreements to repurchase fair value.

+ References

No definition available.

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- Definition

Carrying amount of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1)(i)(A)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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