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INCOME TAXES - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Income Tax Contingency [Line Items]      
Net deferred tax asset $ 134,300   $ 136,400
Valuation allowance 108,700   119,100
Income tax expense $ 23,240 $ 23,955  
Estimated annual effective tax rate, excluding entities from which a tax benefit cannot be recognized and discrete items 23.70% 24.30%  
Santander [Member]      
Income Tax Contingency [Line Items]      
UTBs $ 400    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 100    
US [Member]      
Income Tax Contingency [Line Items]      
Current income tax expense 2,600 $ 2,200  
Subsidiaries [Member]      
Income Tax Contingency [Line Items]      
Net deferred tax asset 134,300   136,400
Valuation allowance 88,200   $ 98,500
Parent Company [Member]      
Income Tax Contingency [Line Items]      
Income tax expense $ 1 $ 1