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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) banking_office | Jan. 01, 2019 USD ($)
Accounting Policies [Abstract] |  |  |
Number of banking offices | banking_office |  | 32 |
Change in Accounting Estimate [Line Items] |  |  |
Restructuring (reversal) costs incurred | $ (158) | $ 2,600 |
ROU assets | 24,118 | 24,118 |
Operating lease liabilities | $ 25,457 | $ 25,457 |
ASU 2016-02 |  |  |
Change in Accounting Estimate [Line Items] |  |  |
ROU assets |  |  | $ 23,300
Adjustment to remove deferred rent liability |  |  | 1,400
Operating lease liabilities |  |  | $ 24,700

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
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