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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) banking_office segment shares | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) segment
Accounting Policies [Abstract] |  |  |
Number of banking offices | banking_office | 37 |  |
Number of reportable segments | segment | 1 |  | 3
Change in Accounting Estimate [Line Items] |  |  |
Salaries and employee benefits | $ 32,443,000 | $ 33,469,000 |
Net deferred tax asset | 18,673,000 |  | $ 9,989,000
Valuation allowance | $ 0 |  | $ 0
Shares excluded from computation of earnings per share (in shares) | shares | 2,500,000 |  |
Reversal of Excess Accrual |  |  |
Change in Accounting Estimate [Line Items] |  |  |
Salaries and employee benefits | $ 7,800,000 |  |

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