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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2018 USD ($) banking_office	Jun. 30, 2017 USD ($)
Accounting Policies [Abstract]
Number of banking offices | banking_office					34
Change in Accounting Estimate [Line Items]
Salaries and employee benefits	$ 29,440		$ 33,348		$ 60,555	$ 65,791
Accumulated Other Comprehensive Income (Loss) | ASU 2018-02
Change in Accounting Estimate [Line Items]
Stranded tax effects		$ 496			496
Retained Earnings | ASU 2018-02
Change in Accounting Estimate [Line Items]
Stranded tax effects		(496)			$ (496)
Reversal of Excess Accrual
Change in Accounting Estimate [Line Items]
Salaries and employee benefits		$ 937		$ 7,800

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Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(4))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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