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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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