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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans and Allowance for Loan Losses (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Allowance for loan losses |  |
Potential charge-off of loan upon principal or interest default, period one | 90 days |
Potential charge-off of loan upon principal or interest default, period two | 120 days |
Potential charge-off of loan upon principal or interest default, period three | 180 days |
Balance of loans individually evaluated for impairment | $ 26,983,000 | $ 19,355,000
Residential real estate |  |
Allowance for loan losses |  |
Balance of loans individually evaluated for impairment | 1,000,000 |
Non-residential real estate loans |  |
Allowance for loan losses |  |
Balance of loans individually evaluated for impairment | $ 200,000 |

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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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