FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK - Notional amounts of financial instrument with off-balance sheet credit risk (Details) - USD ($) $ in Thousands |
Dec. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Notional amounts of financial instrument with off-balance sheet credit risk | $ 240,275 | $ 186,959 |
| Commitments to originate loans | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Notional amounts of financial instrument with off-balance sheet credit risk | 42,625 | 18,641 |
| Letters of credit | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Notional amounts of financial instrument with off-balance sheet credit risk | 1,546 | 2,004 |
| Unadvanced portions of loans | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Notional amounts of financial instrument with off-balance sheet credit risk | $ 196,104 | $ 166,314 |