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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) banking_office segment | Jun. 30, 2016 USD ($) | Dec. 31, 2016 segment
Accounting Policies [Abstract] |  |  |  |  |  |
Number of banking offices | banking_office |  |  |  | 35 |  |
Number of reportable segments | segment |  |  |  | 1 |  | 3
Transfer of held-to-maturity securities to available-for-sale securities | $ 740,900 |  |  | $ 740,900 |  |
Increase to accumulated other comprehensive income | 22,000 |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Salaries and employee benefits | $ 33,348 |  | $ 32,745 | $ 65,791 | $ 66,214 |
Reversal of Excess Accrual |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Salaries and employee benefits |  | $ 7,800 |  |  |  |

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