GOODWILL AND OTHER INTANGIBLES - Gross Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets, Gross [Abstract]
Beginning balance	$ 116,428	$ 77,196	$ 77,196
Ending balance	116,876	116,428	77,196
Accumulated amortization:
Beginning balance	(75,535)	(69,623)	(66,537)
Amortization	(11,407)	(5,912)	(3,086)
Ending balance	(86,942)	(75,535)	(69,623)
Net intangible assets	29,934	40,893	7,573
BSPR
Finite-Lived Intangible Assets, Gross [Abstract]
Additions due to acquisitions	448	39,232
Core Deposits [Member]
Finite-Lived Intangible Assets, Gross [Abstract]
Beginning balance	87,096	51,664	51,664
Ending balance	87,544	87,096	51,664
Accumulated amortization:
Beginning balance	(51,254)	(48,176)	(47,329)
Amortization	(7,719)	(3,078)	(847)
Ending balance	(58,973)	(51,254)	(48,176)
Net intangible assets	$ 28,571	$ 35,842	$ 3,488
Remaining amortization period (in years)	8 years	9 years	5 years 1 month 6 days
Core Deposits [Member] | BSPR
Finite-Lived Intangible Assets, Gross [Abstract]
Additions due to acquisitions	$ 448	$ 35,432
Purchased Credit Card Relationship Intangible [Member]
Finite-Lived Intangible Assets, Gross [Abstract]
Beginning balance	$ 28,265
Ending balance		$ 28,265
Accumulated amortization:
Remaining amortization period (in years)	1 year 8 months 12 days	2 years 8 months 12 days	1 year 10 months 24 days
Purchased Credit Card Relationship Intangible [Member] | BSPR
Finite-Lived Intangible Assets, Gross [Abstract]
Additions due to acquisitions		$ 3,800
Customer Relationships [Member]
Finite-Lived Intangible Assets, Gross [Abstract]
Beginning balance	$ 1,067
Ending balance		$ 1,067
Accumulated amortization:
Remaining amortization period (in years)	1 year 1 month 6 days	2 years 1 month 6 days	3 years
Customer Relationships [Member] | BSPR
Finite-Lived Intangible Assets, Gross [Abstract]
Additions due to acquisitions		$ 0
Customer Relationships [Member] | Credit Card [Member]
Finite-Lived Intangible Assets, Gross [Abstract]
Beginning balance	$ 28,265	24,465	$ 24,465
Ending balance	28,265	28,265	24,465
Accumulated amortization:
Beginning balance	(23,532)	(20,850)	(18,763)
Amortization	(3,535)	(2,682)	(2,087)
Ending balance	(27,067)	(23,532)	(20,850)
Net intangible assets	1,198	4,733	3,615
Customer Relationships [Member] | Credit Card [Member] | BSPR
Finite-Lived Intangible Assets, Gross [Abstract]
Additions due to acquisitions	0
Customer Relationships [Member] | Insurance Customer Intangible [Member]
Finite-Lived Intangible Assets, Gross [Abstract]
Beginning balance	1,067	1,067	1,067
Ending balance	1,067	1,067	1,067
Accumulated amortization:
Beginning balance	(749)	(597)	(445)
Amortization	(153)	(152)	(152)
Ending balance	(902)	(749)	(597)
Net intangible assets	165	$ 318	$ 470
Customer Relationships [Member] | Insurance Customer Intangible [Member] | BSPR
Finite-Lived Intangible Assets, Gross [Abstract]
Additions due to acquisitions	$ 0