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INCOME TAXES - Components of Net Deferred Tax Liability (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Components of net deferred tax liability |  |
Investment securities | $ 157,456 | $ 191,953
Allowance for loan losses | 16,398 | 15,346
Employee benefits | 5,727 | 5,775
Operating lease liabilities | 10,211 | 7,552
Other, net | 6,023 | 4,385
Deferred tax asset | 195,815 | 225,011
Goodwill and intangibles | 39,366 | 39,454
Operating lease right-of-use assets | 9,872 | 7,303
Loan origination costs | 10,777 | 9,731
Depreciation | 383 | 96
Mortgage servicing rights | 306 | 640
Pension | 19,181 | 18,154
Deferred tax liability | 79,885 | 75,378
Net deferred tax asset | $ 115,930 | $ 149,633

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