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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) banking_office	Mar. 31, 2017 USD ($)
Accounting Policies [Abstract]
Number of banking offices | banking_office	34
Change in Accounting Estimate [Line Items]
Salaries and employee benefits	$ 31,115	$ 32,443
Accumulated Other Comprehensive Income (Loss) | ASU 2018-02
Change in Accounting Estimate [Line Items]
Stranded tax effects	496
Retained Earnings | ASU 2018-02
Change in Accounting Estimate [Line Items]
Stranded tax effects	(496)
Reversal of Excess Accrual
Change in Accounting Estimate [Line Items]
Salaries and employee benefits	$ 937	$ 7,800

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The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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