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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) banking_office	Sep. 30, 2018 USD ($)	Jan. 01, 2019 USD ($)
Accounting Policies [Abstract]
Number of banking offices | banking_office				32
Change in Accounting Estimate [Line Items]
ROU assets	$ 23,907,000			$ 23,907,000
Operating lease liabilities	25,210,000			25,210,000
Restructuring (reversal) expense	$ 0	$ (158,000)	$ 553,000	$ 2,637,000	$ 4,536,000
ASU 2016-02
Change in Accounting Estimate [Line Items]
ROU assets						$ 23,300,000
Adjustment to remove deferred rent liability						1,400,000
Operating lease liabilities						$ 24,700,000

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Number of offices included in Nature of Operations disclosure.

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The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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