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FAIR VALUE MEASUREMENTS - Carrying value and estimated fair value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financial assets:
Securities held to maturity, fair value	$ 110,867	$ 103,626
Securities available for sale	138,420	142,197
Mortgage servicing rights	13,356	13,668	$ 9,582
Carrying Amount
Financial assets:
Cash and cash equivalents	83,374	247,468
Securities held to maturity, fair value	111,732	103,324
Loans held for sale	1,293	3,012
Loans, net	3,339,017	3,299,365
Other investments, at cost	21,290	21,366
Mortgage servicing rights	13,356	13,668
Financial liabilities:
Deposits	3,416,039	3,432,920
Securities sold under repurchase agreements		75,747
Notes payable	35,295	35,270
Subordinated notes	12,000	12,000
Junior subordinated debentures		4,124
Carrying Amount | Level 1
Financial assets:
Cash and cash equivalents	83,374	247,468
Securities held to maturity, fair value	107,006	99,475
Carrying Amount | Level 2
Financial assets:
Securities held to maturity, fair value	3,861	4,151
Mortgage servicing rights	13,356	13,668
Financial liabilities:
Securities sold under repurchase agreements		75,747
Notes payable	35,295	35,270
Subordinated notes	12,000	12,000
Junior subordinated debentures		4,124
Carrying Amount | Level 3
Financial assets:
Loans held for sale	1,293	3,012
Loans, net	3,190,622	3,168,749
Other investments, at cost	21,290	21,366
Financial liabilities:
Deposits	3,138,967	3,153,512
Estimated Fair Value
Financial assets:
Cash and cash equivalents	83,374	247,468
Securities held to maturity, fair value	110,867	103,626
Loans held for sale	1,293	3,012
Loans, net	3,190,622	3,168,749
Other investments, at cost	21,290	21,366
Mortgage servicing rights	13,356	13,668
Financial liabilities:
Deposits	3,138,967	3,153,512
Securities sold under repurchase agreements		75,747
Notes payable	35,295	35,270
Subordinated notes	$ 12,000	12,000
Junior subordinated debentures		$ 4,124

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Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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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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