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CAPITAL RATIOS AND SHAREHOLDERS' EQUITY - Components of AOCI (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (53,151)	$ (58,340)
Net unrealized gain on AFS securities:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, before tax:	(65,826)	(71,832)
Income taxes related to items of accumulated other comprehensive income:	15,180	16,586
Accumulated other comprehensive loss	(50,646)	(55,246)	$ (20,225)	$ 1,985
Net unrealized gain arising during the period
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, before tax:	(1,566)	(2,333)
Income taxes related to items of accumulated other comprehensive income:	361	539
Accumulated other comprehensive loss	(1,205)	(1,794)	(578)	870
Net unrealized loss on post-retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, before tax:	(1,675)	(1,691)
Income taxes related to items of accumulated other comprehensive income:	375	391
Accumulated other comprehensive loss	$ (1,300)	$ (1,300)	$ (552)	$ (552)

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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