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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) banking_office | Sep. 30, 2017 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |
Number of banking offices | banking_office |  |  |  |  | 34 |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Salaries and employee benefits | $ 24,832 |  | $ 30,216 |  | $ 85,387 | $ 96,007
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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- Definition Tax Cuts And Jobs Act Of 2017, Reclassification From AOCI To Retained Earnings, Tax Effect + References No definition available. + Details
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- Definition 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 + Details
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