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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 27, 2015
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
subsidiaries
Dec. 31, 2016
USD ($)
subsidiaries
Dec. 31, 2012
USD ($)
Nature Of Business [Line Items]          
Period For Other Than Temporary Impairment     1 year    
Guaranteed Loans Past Due     2 months 29 days    
Period Of Residential Mortgage Loan That Are No Longer Accruing Interest     1 year 3 months 1 year 3 months  
Loans Considered To Be Defaulted If Borrower Has Failed To Make Payment For Period Or More Than Period     2 months 29 days 2 months 29 days  
Loans Past Due     30 days    
Resdiential Mortgage Loans Charge Off     5 months 27 days    
Modified Repurchase Agreements Threshold     10.00%    
Investment In Subsidiaries Other Real Estate Owned | subsidiaries       2  
Wholy Owned Investments Subsidiaries | subsidiaries     2    
Base Rate Historical Charge Offs Period       1 year  
Cummulative Charge Offs Period       2 years  
Troubled Debt Restructurings Sustained Performance Period       6 months  
Business Combination Finite Lived Intangible Assets Net     $ 3,700 $ 4,400  
Branches Doral 10        
Wholy Owned Investments Subsidiaries FirstBank | subsidiaries     6    
Business Combination Restrospective Adjustments Threshold     1 year    
Rewards liability     $ 7,000 $ 7,100  
Discount rate used for calculation of mortgage servicing rights value     14.00% 14.10%  
Loan Value Deliquency Threshold To Be Valued At Fair Value Percent     60.00%    
Financing receivable, individually evaluated for impairment     $ 1,000    
Financing Arrangements With Municipalities Threshold     8 years    
Callable Debt Securities Held At Premium     $ 4,100    
Callable Debt Securities Unamortized Premium     $ 47    
Customer Related Intangible Assets Member          
Nature Of Business [Line Items]          
Finite lived Intangible Assets Acquired 1   $ 1,100      
Purchased Credit Card Relationship Intangible [Member]          
Nature Of Business [Line Items]          
Finite lived Intangible Assets Acquired 1         $ 24,500
Open End Loans [Member]          
Nature Of Business [Line Items]          
Consumer Loans Charge Off     5 months 27 days    
Consumer Auto Loans And Finance Leases [Member]          
Nature Of Business [Line Items]          
Consumer Loans Reserved     3 months 28 days    
Consumer Loans Charge Off     1 year