INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Allowance for credit losses and other contingent liabilities	$ 29,013	$ 26,926
Tax effect of other components of income on securities available-for-sale	14,251	34,745
Tax effect of other components of income on securities held-to-maturity	6,048	7,216
Operating lease liability	15,034	19,229
Other	3,546	2,603
Total deferred tax assets	67,892	90,719
Deferred tax liabilities:
Tax effect of other components of income on derivatives	3,261	2,368
Employee benefit plans	3,259	1,707
Tax effect of purchase accounting fair value adjustments	(201)	1,329
Difference in book and tax carrying value of fixed assets	670	2,230
Difference in book and tax basis of unearned loan fees	2,531	3,239
Operating lease asset	14,179	18,266
States taxes		2,166
Other	951	241
Total deferred tax liabilities	24,650	31,546
Net deferred tax asset (recorded in other assets)	$ 43,242	$ 59,173