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INCOME TAXES - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Sep. 01, 2020
Income Tax Contingency [Line Items]            
Maximum corporate tax rate     37.50%      
Net deferred tax asset $ 153,900   $ 153,900   $ 155,600  
Valuation allowance 184,200   184,200   185,500  
Income tax expense 30,284 $ 34,103 $ 62,219 $ 77,128    
Minimum percentage of bank net taxable income for paying income tax at normal rate     20.00%      
Estimated annual effective tax rate, including all entities     30.10% 31.70%    
Santander [Member]            
Income Tax Contingency [Line Items]            
UTBs           $ 1,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense     $ 200      
U S [Member]            
Income Tax Contingency [Line Items]            
Income tax expense 1,500 2,500 4,000 $ 4,100    
Subsidiaries [Member]            
Income Tax Contingency [Line Items]            
Net deferred tax asset 153,900   153,900   155,600  
Valuation allowance 147,000   147,000   $ 149,500  
Parent Company [Member]            
Income Tax Contingency [Line Items]            
Income tax expense $ 783 $ 793 $ 1,861 $ 1,899    
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%