LOAN PORTFOLIO - Loan Restructuring and Effect on Allowance for Loan and Lease Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Loans And Leases Receivable Disclosure [Abstract]
Beginning balance	$ 183,732	$ 225,856	$ 196,362	$ 231,843
Charges to the provision for loan losses	12,534	19,536	24,354	40,080
Amount charged-off	27,913	27,696	56,273	57,056
Ending balance	172,011	222,035	172,011	222,035
Entity Loan Modification Program [Member]
Financing Receivable, Troubled Debt Restructuring [Abstract]
Beginning Balance of TDRs	589,795	572,376	582,647	587,219
New TDRs loans splits	6,961	13,228	32,420	56,647
Paid-off and partial payments	(9,344)	(16,108)	(22,366)	(34,927)
Ending balance of TDRs	582,389	557,196	582,389	557,196
Entity Loan Modification Program [Member] | Ab Note Restructure Workout Strategy [Member]
Financing Receivable, Troubled Debt Restructuring [Abstract]
Beginning Balance of TDRs			33,840	35,577
New TDRs loans splits			20,059	29,601
Paid-off and partial payments			(683)	(619)
Ending balance of TDRs	53,216	64,559	53,216	64,559
Loans And Leases Receivable Disclosure [Abstract]
Beginning balance			473	3,846
Charges to the provision for loan losses			1,106	1,902
Amount charged-off			0	(1,137)
Ending balance	$ 1,579	$ 4,611	$ 1,579	$ 4,611