COMMITMENTS AND CONTINGENCIES - Summary of the contract or notional amount of the Company's exposure to off-balance-sheet risk (Details) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Commitments to extend credit | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Contract or notional amount | $ 554,980 | $ 302,591 |
| Financial letters of credit | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Contract or notional amount | 12,444 | 2,610 |
| Standby letters of credit | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Contract or notional amount | $ 4,898 | $ 4,314 |