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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Number of reportable segments | segment | 1 |  |
Credit losses related to unfunded loan commitments | $ 11,385,000 | $ 9,836,000 | $ 9,309,000
Threshold amount of estimate loss for evaluating individual loans for impairment | 100,000 |  |
Accrued interest related to unrecognized tax benefits | 0 |  |
Fair value of trust assets under management | $ 1,103,228,000 | 1,007,113,000 |
Trust revenue is earned and collected monthly | 83.00% |  |
Commercial |  |  |
Credit losses related to unfunded loan commitments | $ 6,308,000 | 4,788,000 | 4,591,000
Commercial | Maximum |  |  |
Threshold amount of loan balance for evaluating individual impairment loss | 200,000 |  |
Residential mortgage |  |  |
Credit losses related to unfunded loan commitments | 4,253,000 | 4,182,000 | 3,986,000
Residential mortgage | Maximum |  |  |
Threshold amount of loan balance for evaluating individual impairment loss | 400,000 |  |
Consumer |  |  |
Credit losses related to unfunded loan commitments | 239,000 | 281,000 | $ 233,000
Consumer | Maximum |  |  |
Threshold amount of loan balance for evaluating individual impairment loss | 400,000 |  |
Unfunded Loan Commitment |  |  |
Credit losses related to unfunded loan commitments | $ 0 | $ 0 |

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