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BUSINESS COMBINATION - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended 28 Months Ended
Sep. 01, 2020
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Business Acquisition [Line Items]            
Business Combination, Acquisition Related Costs     $ 26,435 $ 26,509 $ 11,442 $ 64,300
Goodwill   $ 38,632 38,611 38,632 $ 28,098 38,611
Intangible assets recognized as part of a business combination     29,900     29,900
Fair value of PCD held to maturity securities $ 55,500          
Adjustments to goodwill     (21) $ 4,231    
Core Deposits [Member]            
Business Acquisition [Line Items]            
Intangible assets recognized as part of a business combination     28,600     28,600
Customer Relationships [Member] | Credit Card [Member]            
Business Acquisition [Line Items]            
Intangible assets recognized as part of a business combination     $ 1,200     $ 1,200
BSPR            
Business Acquisition [Line Items]            
Business Acquisition, Effective Date of Acquisition Sep. 01, 2020          
Business Acquisition, Name of Acquired Entity     BSPR      
Goodwill $ 11,900          
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 752,800          
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          
Adjustments to goodwill $ 4,200 $ 4,200        
BSPR | Fair Value As Remeasured [Member]            
Business Acquisition [Line Items]            
Goodwill 10,513          
Intangible assets recognized as part of a business combination 39,680          
BSPR | Core Deposits [Member]            
Business Acquisition [Line Items]            
Intangible assets recognized as part of a business combination $ 35,900          
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