GOODWILL AND OTHER INTANGIBLES - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Finite Lived Intangible Assets [Line Items]
Goodwill	$ 38,611,000		$ 38,611,000		$ 38,611,000
Goodwill impairment			0
Amortization of intangible assets	1,900,000	$ 2,200,000	5,889,000	$ 6,689,000
Change in carrying amount of goodwill	$ 0	$ 0	$ 0	$ 0
Goodwill Impaired Facts And Circumstances Leading To Impairment			The Corporation’s policy is to assess goodwill and other intangibles for impairment on an annual basis during the fourth quarter of each year, and more frequently if events or circumstances lead management to believe that the values of goodwill or other intangibles may be impaired. During the fourth quarter of 2022, management performed a qualitative analysis over the carrying amount of each relevant reporting units’ goodwill and concluded that it is more-likely-than-not that the fair value of the reporting units exceeded their carrying value. This assessment involved identifying the inputs and assumptions that most affect fair value, including evaluating significant and relevant events impacting each reporting entity, and evaluating such factors to determine if a positive assertion can be made that it is more-likely-than-not that the fair value of the reporting units exceeded their carrying amount. As of December 31, 2022, the Corporation concluded that it is more-likely-than-not that the fair value of the reporting units exceeded their carrying value. The Corporation determined that there have been no significant events since the last annual assessment that could indicate potential goodwill impairment on reporting units for which the goodwill is allocated. As a result, no impairment charges for goodwill were recorded during the first nine months of 2023.
Impaired Intangible Asset Description			The Corporation amortizes core deposit intangibles based on the projected useful lives of the related deposits. Core deposit intangibles are analyzed annually for impairment, or sooner if events and circumstances indicate possible impairment. Factors that may suggest impairment include customer attrition and run-off. Management is unaware of any events and/or circumstances that would indicate a possible impairment to the core deposit intangibles as of September 30, 2023.