GOODWILL AND OTHER INTANGIBLES - Gross Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2012
Core Deposits [Member]
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 51,664	$ 51,664
Accumulated amortization	(47,329)	(46,186)
Net carrying amount	$ 4,335	$ 5,478
Remaining amortization period	6 years	7 years
Customer Relationships [Member] | Credit Card [Member]
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 24,465	$ 24,465	$ 24,500
Accumulated amortization	(18,763)	(16,465)
Net carrying amount	$ 5,702	$ 8,000
Remaining amortization period	2 years 10 months 24 days	3 years 10 months 24 days
Customer Relationships [Member] | Insurance Customer Intangible [Member]
Finite Lived Intangible Assets [Line Items]
Gross amount	$ 1,067	$ 1,067
Accumulated amortization	(445)	(292)
Net carrying amount	$ 622	$ 775
Remaining amortization period	4 years	5 years