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INCOME TAXES- Significant components of deferred tax assets and liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Assets [Abstract]    
Allowance for loan and lease losses $ 94,111 $ 79,330
Legal reserve 2,333 1,807
Reserve for insurance premium cancellations 635 724
Net operating loss and donation carryforward available 376,423 374,091
Impairment on investments 0 4,438
Tax credits available for carryforward 6,598 8,006
Unrealized net loss on equity investments 0 187
Unrealized net loss on available for sale securities 0 502
Settlement payment - closing agreement 7,313 7,313
Unrealized net loss on REO valuation 14,784 11,467
Other 8,326 15,720
Deferred tax asset 510,523 503,585
Deferred Tax Liabilities [Abstract]    
Unrealized gain on available-for-sale securities, net 1,306 0
Differences between the assigned values and tax bases of assets and liabilities recognized in purchase business combinations 5,143 5,247
Deferred Tax Liabilities Mortgage Servicing Rights 8,625 8,997
Other 9,457 468
Deferred tax liability 24,531 14,712
Valuation allowance (191,183) (207,216)
Deferred income taxes, net $ 294,809 $ 281,657