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BUSINESS COMBINATION - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 15 Months Ended
Sep. 01, 2020
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Business Acquisition [Line Items]                
Merger and Restructuring costs     $ 10,441   $ 592 $ 14,188 $ 592  
Goodwill   $ 34,401 $ 34,401 $ 28,098   $ 34,401   $ 34,401
Fair value of PCD held to maturity securities $ 55,532              
Contractual amount PCD held to maturity securities 67,082              
Discosunt on PCD held to maturity securities 10,281              
Initial allowance on PCD debt securities 1,269              
Fair value of PCD loans 753,042              
Contractual amount of PCD loans $ 786,049              
BSPR                
Business Acquisition [Line Items]                
Business Acquisition, Effective Date of Acquisition Sep. 01, 2020              
Business Acquisition, Name of Acquired Entity           BSPR    
Business Combination, Reason for Business Combination           The acquisition of BSPR expands the Corporation’s presence in Puerto Rico, increases its operational scale and strengthens its competitiveness in retail, commercial, business banking, and residential lending. The acquisition also allowed the Corporation to increase its deposit base at a lower cost, which enhances FirstBank’s funding and risk profile.    
Merger and Restructuring costs       $ 10,800   $ 14,200 $ 600 $ 25,600
Goodwill $ 6,300              
Intangible assets recognized as part of a business combination 39,200              
Fair value of PCD held to maturity securities 55,500              
Contractual amount PCD held to maturity securities 67,100              
Initial allowance on PCD debt securities 1,300              
Fair value of non-PCD loans 1,800,000              
Fair value of PCD loans 753,000              
Contractual amount of non-PCD loans 1,800,000              
Contractual amount of PCD loans 786,000              
Provision for credit losses 38,900              
ACL for PCD loans $ 28,700              
Acquired Deposits Weighted Average Useful Life 1 year 2 months 12 days              
After tax provision for credit losses   $ 25,900            
Business Combination Acquisition Related Costs Incurred By The Acquiree           $ 2,000    
BSPR | Core Deposits [Member]                
Business Acquisition [Line Items]                
Intangible assets recognized as part of a business combination $ 35,400              
Weighted average useful life 5 years 8 months 12 days              
BSPR | Customer Relationships [Member] | Credit Card [Member]                
Business Acquisition [Line Items]                
Intangible assets recognized as part of a business combination $ 3,800              
Weighted average useful life 3 years