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BUSINESS COMBINATION - Business Combination (Parenthetical) (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Feb. 27, 2015
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Business Combination Bargain Purchase After Tax Gain Recognized Amount $ 8,200,000      
Premium On Loans Acquired 1,300,000      
Liabilities Fair Value Adjustment 800,000      
Contractually outstanding principal and interest at acquisition     $ 196,600,000 $ 207,300,000
Discount On Purchased Credit Impaired Loans 13,400,000      
Purchased Credit Impaired Loans Acquired $ 93,300,000      
Branches Doral 10      
Non Sop Unpaid Principal Balance $ 227,900,000      
Business Combinantion Measurement Period   1 year    
Conversion Costs [Member]        
Business Acquisition [Line Items]        
Business Combination Acquisition Nonrecurring Costs   $ 4,600,000    
Interim Servicing Costs [Member]        
Business Acquisition [Line Items]        
Business Combination Acquisition Nonrecurring Costs   $ 3,600,000    
Deposits [Member]        
Business Acquisition [Line Items]        
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Financial Liabilities 522,700,000      
Property Plant And Equipment [Member]        
Business Acquisition [Line Items]        
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Financial Assets 5,500,000      
Cash [Member]        
Business Acquisition [Line Items]        
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Financial Assets 217,700,000      
Loans [Member]        
Business Acquisition [Line Items]        
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Financial Assets $ 324,800,000