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INCOME TAXES - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
subsidiaries
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Income Tax Contingency [Line Items]      
Number of subsidiaries from which corporation is not able to utilize losses | subsidiaries 1    
Percentage of dividend received deduction from controlled subsidiaries 100.00%    
Percentage of dividend received from other taxable domestic corporations 85.00%    
Statutory rate 39.00% 39.00% 39.00%
Minimum percentage of bank net taxable income for paying Income tax at normal rate 20.00%    
Income tax expense $ (4,973) $ 37,030 $ 6,419
Net Deferred Tax Assets Tax Credit Carryforwards And Temporary Differences $ 125,600 117,000  
Cumulative Gain Position Period 3 years    
Defferred Tax Assets Other Net Operating Losses $ 5,600 12,900  
Valuation allowance 191,183 207,216  
Income Tax Benefit Change In Tax Status $ 13,200    
Section 382 Change In Ownership Testing Period 3 years    
P R      
Income Tax Contingency [Line Items]      
Statute of limitations under income tax act 4 years    
U S      
Income Tax Contingency [Line Items]      
Statute of limitations under income tax act 3 years    
Income Tax Expense Section 382 $ 2,300    
Corporate Tax Rate 35.00%    
Tax Reform Corporate Tax Rate 21.00%    
Tax Reform Tax Rate Repatriation Of Liquid Assets 15.50%    
Tax Reform Tax Rate On Base Erotions Payments 10.00%    
Tax Reform Tax Rate Global Intangible Low Tax Income 10.50%    
Section 382 Ownership Threshold 50.00%    
V I      
Income Tax Contingency [Line Items]      
Statute of limitations under income tax act 3 years    
First Ban Corp [Member]      
Income Tax Contingency [Line Items]      
Deferred Tax Assets Net $ 294,800    
Valuation allowance 191,200    
FirstBank [Member]      
Income Tax Contingency [Line Items]      
Deferred Tax Assets Current 173,200 171,500  
Deferred Tax Assets Net 294,700 277,400  
Valuation allowance $ 150,700 $ 171,000