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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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