GOODWILL AND OTHER INTANGIBLES - Gross Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Finite Lived Intangible Assets [Line Items]
Net carrying amount	$ 15,229	$ 21,118
Core Deposits [Member]
Finite Lived Intangible Assets [Line Items]
Gross amount	87,544	87,544
Accumulated amortization	(72,315)	(66,644)
Net carrying amount	$ 15,229	$ 20,900
Remaining amortization period (in years)	6 years 3 months 18 days	7 years
Customer Relationships [Member] | Credit Card [Member]
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 0	$ 3,800
Accumulated amortization	0	(3,595)
Net carrying amount	0	$ 205
Remaining amortization period (in years)		8 months 12 days
Insurance Customer Relationship Intangible [Member]
Finite Lived Intangible Assets [Line Items]
Gross amount	0	$ 1,067
Accumulated amortization	0	(1,054)
Net carrying amount	$ 0	$ 13
Remaining amortization period (in years)		1 month 6 days