LOAN PORTFOLIO - Loan Restructuring and Effect on Allowance for Loan and Lease Losses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Loans And Leases Receivable Disclosure [Abstract]
Beginning balance	$ 196,362	$ 231,843
Provision For Loan And Lease Losses	11,820	20,544
Ending balance	183,732	225,856
Entity Loan Modification Program [Member]
Financing Receivable, Troubled Debt Restructuring [Abstract]
Beginning Balance of TDRs	582,647	587,219
New TDRs loan splits	25,459	43,419
Paid-off and partial payments	(13,022)	(18,819)
Ending balance of TDRs	589,795	572,376
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 loan splits	20,059	0
Paid-off and partial payments	(331)	(24)
Ending balance of TDRs	53,568	35,553
Loans And Leases Receivable Disclosure [Abstract]
Beginning balance	473	3,846
Provision For Loan And Lease Losses	487	1,412
Ending balance	$ 960	$ 5,258