INCOME TAXES - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Contingency [Line Items]
Maximum corporate tax rate	37.50%	37.50%	37.50%
Net deferred tax asset	$ 136,356	$ 150,127
Valuation allowance	119,080	139,188
Deferred tax asset not subject to expiration period	233,500	253,900
Income tax expense	92,483	94,572	$ 142,512
Current income tax expense	78,352	88,467	88,296
NOL and capital losses carryforward	36,721	48,633
Year 2025 Through 2037 [Member]
Income Tax Contingency [Line Items]
NOL and capital losses carryforward	21,900
Tax Year 2025 [Member]
Income Tax Contingency [Line Items]
NOL and capital losses carryforward	3,400
Santander [Member]
Income Tax Contingency [Line Items]
UTBs	400
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	100
Benefit recognized from expiration of uncertain tax positions acquired	400
US [Member]
Income Tax Contingency [Line Items]
Income tax expense	10,600	9,900	10,300
Subsidiaries [Member]
Income Tax Contingency [Line Items]
Net deferred tax asset	136,400	150,100
Valuation allowance	98,500	111,400
Parent Company [Member]
Income Tax Contingency [Line Items]
Valuation allowance	20,600
Income tax expense	$ 1	$ 1	$ 1
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%