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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Summary of recorded investment amount and related allowance for losses of impaired loans (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 USD ($) borrower loan | Sep. 30, 2018 borrower | Dec. 31, 2018 USD ($)
Financing Receivable, Impaired [Line Items] |  |  |
Loans outstanding | $ 700,000 |  |
Number of borrowers | borrower | 47 | 43 |
30-89 Days Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans outstanding | $ 652,000 |  | $ 1,726,000
30-89 Days Past Due | Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans outstanding | $ 700,000 |  |
Consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Number of loans | loan | 2 |  |
Number of borrowers | borrower | 1 |  |
Amount of consumer and indirect loans, outstanding | $ 41,641 |  |
Amount of consumer and indirect loans, specific reserves | 15,260 |  |
Consumer | 30-89 Days Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans outstanding | 54,000 |  | 216,000
Commercial | 30-89 Days Past Due |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans outstanding |  |  | $ 86,000
Commercial | 30-89 Days Past Due | Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans outstanding | 195,000 |  |
Commercial Real Estate | 30-89 Days Past Due | Substandard |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Loans outstanding | $ 546,000 |  |

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