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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Number of reportable segments | segment | 1 |  |
Contractual performance period of nonaccrual loans to be restored to accrual status | 6 months |  |
Purchased loans past due as deterioration indicator | 90 days |  |
Minimum period past due to charge off loans | 120 days |  |
Number of distinct segments in loan portfolio | segment | 3 |  |
Credit losses related to unfunded loan commitments | $ 13,537,000 | $ 11,385,000 | $ 9,836,000
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 | $ 1,232,919,000 | 1,103,228,000 |
Trust revenue is earned and collected monthly | 84.00% |  |
Commercial |  |  |
Credit losses related to unfunded loan commitments | $ 8,293,000 | 6,308,000 | 4,788,000
Commercial | Maximum |  |  |
Threshold amount of loan balance for evaluating individual impairment loss | 200,000 |  |
Residential mortgage |  |  |
Credit losses related to unfunded loan commitments | 4,338,000 | 4,253,000 | 4,182,000
Residential mortgage | Maximum |  |  |
Threshold amount of loan balance for evaluating individual impairment loss | 400,000 |  |
Consumer |  |  |
Credit losses related to unfunded loan commitments | 235,000 | 239,000 | $ 281,000
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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- Definition Minimum loan period past due on a contractual basis to be generally charged off, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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