INCOME TAXES- Significant components of deferred tax assets and liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets [Abstract]
Net operating loss carryforward	$ 316,059	$ 376,423
Allowance for loan and lease losses	75,010	94,111
Alternative Minimum Tax credits available for carryforwards	9,238	6,598
Unrealized loss on OREO valuation	15,405	14,784
Unrealized net loss on available for sale securities	189	0
Settlement payment - closing agreement	7,031	7,313
Legal and other reserves	3,293	2,333
Reserve for insurance premium cancellations	610	635
Other	7,526	8,326
Total gross deferred tax asset	434,361	510,523
Deferred Tax Liabilities [Abstract]
Differences between the assigned values and tax bases of assets and liabilities recognized in purchase business combinations	4,192	5,143
Servicing assets	9,143	8,625
Unrealized gain on available-for-sale securities, net	0	1,306
Other	514	9,457
Deferred tax liability	13,849	24,531
Valuation allowance	(100,661)	(191,183)
Net deferred tax asset	$ 319,851	$ 294,809