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INCOME TAXES - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Sep. 01, 2020
Income Tax Contingency [Line Items]            
Maximum corporate tax rate     37.50%      
Net deferred tax asset $ 150,800   $ 150,800   $ 155,600  
Valuation allowance 195,100   195,100   185,500  
Income tax expense 26,968 $ 32,028 $ 89,187 $ 109,156    
Minimum percentage of bank net taxable income for paying income tax at normal rate     20.00%      
Estimated annual effective tax rate, including all entities     28.20% 31.80%    
Santander [Member]            
Income Tax Contingency [Line Items]            
UTBs           $ 800
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense     $ 200      
U S [Member]            
Income Tax Contingency [Line Items]            
Income tax expense 2,800 3,000 6,800 $ 7,100    
Subsidiaries [Member]            
Income Tax Contingency [Line Items]            
Net deferred tax asset 150,800   150,800   155,600  
Valuation allowance 157,900   157,900   $ 149,500  
Parent Company [Member]            
Income Tax Contingency [Line Items]            
Income tax expense $ 745 $ 735 $ 2,606 $ 2,634    
Domestic Country [Member] | Subsidiaries [Member]            
Income Tax Contingency [Line Items]            
Dividend received deduction     100.00%      
Domestic Country [Member] | Other taxable domestic corporations [Member]            
Income Tax Contingency [Line Items]            
Dividend received deduction     85.00%