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GOODWILL AND OTHER INTANGIBLES - Gross Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2012
Finite Lived Intangible Assets [Line Items]
Net carrying amount	$ 3,900	$ 4,300
Core Deposits [Member]
Finite Lived Intangible Assets [Line Items]
Gross amount	51,664	51,664
Accumulated amortization	(47,761)	(47,329)
Net carrying amount	$ 3,903	$ 4,335
Remaining amortization period	5 years 7 months 6 days	6 years
Customer Relationships [Member] | Credit Card [Member]
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 24,465	$ 24,465	$ 24,500
Accumulated amortization	(19,806)	(18,763)
Net carrying amount	$ 4,659	$ 5,702
Remaining amortization period	2 years 4 months 24 days	2 years 10 months 24 days
Customer Relationships [Member] | Insurance Customer Intangible [Member]
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 1,067	$ 1,067
Accumulated amortization	(521)	(445)
Net carrying amount	$ 546	$ 622
Remaining amortization period	3 years 6 months	4 years

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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