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GOODWILL AND OTHER INTANGIBLES - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]        
Goodwill $ 38,611,000 $ 38,611,000 $ 38,632,000 $ 28,098,000
Goodwill impairment 0      
Amortization of intangible assets 8,816,000 11,407,000 5,912,000  
Change in carrying amount of goodwill 0      
Merger and restructuring costs $ 0 $ 26,435,000 $ 26,509,000  
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. In the qualitative assessment performed for each reporting unit, the Corporation evaluated events and circumstances that could impact the fair value including the following: ● Macroeconomic conditions, such as improvement or deterioration in general economic conditions; ● Industry and market considerations; ● Interest rate fluctuations; ● Overall financial performance of the entity; ● Performance of industry peers over the last year; and ● Recent market transactions. Management considered positive and negative evidence obtained during the evaluation of significant events and circumstances and evaluated such information to conclude that it is more likely than not that the reporting unit’s fair value is greater than their carrying amount; thus, quantitative tests were not required.      
Impaired Intangible Asset Description The Corporation amortizes core deposit intangibles and customer relationship intangibles based on the projected useful lives of the related deposits in the case of core deposit intangibles, and over the projected useful lives of the related client relationships in the case of customer relationship intangibles. The Corporation analyzes core deposit intangibles and customer relationship intangibles 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 or customer relationship intangibles as of December 31, 2022.