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FAIR VALUE MEASUREMENTS - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Financial assets:
Securities held to maturity	$ 74,888	$ 43,770
Securities available for sale	179,046	304,637
Mortgage servicing rights	13,733	9,582	$ 5,016
Carrying Amount
Financial assets:
Cash and cash equivalents	75,776	119,351
Securities held to maturity	77,154	45,097
Securities available for sale	179,046	304,637
Loans held for sale	1,155	648
Loans, net	3,312,145	2,871,298
Other investments, at cost	21,542	16,495
Mortgage servicing rights	13,733	9,582
Financial liabilities:
Deposits	3,398,293	3,060,229
Securities sold under repurchase agreements	17,191	97,196
Notes payable	35,847	1,929
Subordinated notes	23,500	23,500
Junior subordinated debentures	10,972
Carrying Amount | Level 1
Financial assets:
Cash and cash equivalents	75,776	119,351
Carrying Amount | Level 2
Financial assets:
Securities held to maturity	74,888	43,770
Securities available for sale	179,046	304,637
Mortgage servicing rights	13,733	9,582
Financial liabilities:
Securities sold under repurchase agreements	17,191	97,196
Notes payable	35,847	1,929
Subordinated notes	23,500	23,500
Junior subordinated debentures	10,972
Carrying Amount | Level 3
Financial assets:
Loans held for sale	1,155	648
Loans, net	3,184,002	2,832,454
Other investments, at cost	21,542	16,495
Financial liabilities:
Deposits	3,072,252	2,732,007
Estimated Fair Value
Financial assets:
Cash and cash equivalents	75,776	119,351
Securities held to maturity	74,888	43,770
Securities available for sale	179,046	304,637
Loans held for sale	1,155	648
Loans, net	3,184,002	2,832,454
Other investments, at cost	21,542	16,495
Mortgage servicing rights	13,733	9,582
Financial liabilities:
Deposits	3,072,252	2,732,007
Securities sold under repurchase agreements	17,191	97,196
Notes payable	35,847	1,929
Subordinated notes	23,500	$ 23,500
Junior subordinated debentures	$ 10,972

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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