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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 12 Months Ended
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Dec. 31, 2024 USD ($) item segment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Number of reportable segments | segment | 1 |  |
Contractual performance period of nonaccrual loans to be restored to accrual status | 6 months |  |
Credit losses related to unfunded loan commitments | $ 20,035,000 | $ 19,208,000 | $ 16,615,000
Debt security delinquent period to put in nonaccrual status | 90 days |  |
Allowance for credit losses related to the available-for-sale portfolio | $ 0 | 0 |
Interest receivable | 1,964,000 | 2,018,000 |
Interest receivable excluded from the estimate of credit losses | $ 6,680,000 | $ 7,099,000 |
Minimum of credit extension of loans for inclusion in individual review for credit losses | item | 1 |  |
Repayment period of credit facilities | 1 year |  |
Weighted-average remaining life of the entire portfolio | 4 years 14 days | 4 years 5 months 23 days | 4 years 4 months 9 days
Forecast relevant to collectability of cash flows | 2 years |  |
Loans Portfolio, Number of Extension For Individual Review | item | 1 |  |
Accrued interest related to unrecognized tax benefits | $ 0 |  |
Fair value of trust assets under management | $ 1,347,853,000 | $ 1,188,082,000 |
Trust revenue is earned and collected monthly | 81.00% |  |
Minimum | Buildings and improvements |  |  |
Useful lives | 3 years |  |
Minimum | Furniture and equipment |  |  |
Useful lives | 3 years |  |
Maximum | Buildings and improvements |  |  |
Useful lives | 40 years |  |
Maximum | Furniture and equipment |  |  |
Useful lives | 7 years |  |
Residential mortgage |  |  |
Threshold amount of financing receivables individually evaluated for credit losses | $ 200,000 |  |
Consumer |  |  |
Threshold amount of financing receivables individually evaluated for credit losses | $ 400,000 |  |

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