GOODWILL AND OTHER INTANGIBLES - Gross Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Finite Lived Intangible Assets [Line Items]
Net carrying amount	$ 25,424	$ 29,934
Core Deposits [Member]
Finite Lived Intangible Assets [Line Items]
Gross amount	87,544	87,544
Accumulated amortization	(62,808)	(58,973)
Net carrying amount	$ 24,736	$ 28,571
Remaining amortization period (in years)	7 years 6 months	8 years
Customer Relationships [Member] | Credit Card [Member]
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 3,800	$ 3,800
Accumulated amortization	(3,201)	(2,602)
Net carrying amount	$ 599	$ 1,198
Remaining amortization period (in years)	1 year 2 months 12 days	1 year 8 months 12 days
Customer Relationships [Member] | Insurance Customer Intangible [Member]
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 1,067	$ 1,067
Accumulated amortization	(978)	(902)
Net carrying amount	$ 89	$ 165
Remaining amortization period (in years)	7 months 6 days	1 year 1 month 6 days