INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Allowance for credit losses and other contingent liabilities	$ 28,175	$ 29,777
Tax effect of other components of income on securities available-for-sale	38,140	3,265
Tax effect of other components of income on securities held-to-maturity	8,138	343
Operating lease liability	19,256	20,532
Other	2,074	1,976
Total deferred tax assets	95,783	55,893
Deferred tax liabilities:
Tax effect of other components of income on derivatives	5,394	1,371
Employee benefit plans	976	2,803
Tax effect of purchase accounting fair value adjustments	2,352	3,945
Difference in book and tax carrying value of fixed assets	4,261	3,950
Difference in book and tax basis of unearned loan fees	2,431	2,413
Operating lease asset	18,414	19,871
States taxes	2,801	(189)
Other	1,002	1,330
Total deferred tax liabilities	37,631	35,494
Net deferred tax asset (recorded in other assets)	$ 58,152	$ 20,399