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INCOME TAXES - Components of Net Deferred Tax Liability (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Components of net deferred tax liability |  |
Investment securities | $ 191,953 | $ 0
Allowance for loan losses | 15,346 | 12,435
Employee benefits | 5,775 | 7,708
Operating lease liabilities | 7,552 | 7,955
Other, net | 4,385 | 1,250
Deferred tax asset | 225,011 | 29,348
Investment securities | 0 | 7,227
Goodwill and intangibles | 39,454 | 41,917
Operating lease right-of-use assets | 7,303 | 7,693
Loan origination costs | 9,731 | 8,993
Depreciation | 96 | 535
Mortgage servicing rights | 640 | 278
Pension | 18,154 | 22,950
Deferred tax liability | 75,378 | 89,593
Net deferred tax (liability) |  | $ (60,245)
Net deferred tax asset | $ 149,633 |

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