FAIR VALUE DISCLOSURES - Summary of Carrying Value and Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Financial assets:
Financial derivatives	$ 44,875	$ 27,789
Guarantee and commitment fees receivable	57,214	50,499
Financial liabilities:
Financial derivatives	21,618	77,326
Guarantee and commitment obligation	54,770	48,326
Fair Value
Financial assets:
Cash and cash equivalents	931,067	1,024,007
Investment securities	17,390,108	16,302,559
Loans	16,342,149	12,924,604
Financial derivatives	44,875	27,789
Guarantee and commitment fees receivable	63,677	57,562
Financial liabilities:
Notes payable	30,489,417	26,759,873
Debt securities of consolidated trusts held by third parties	2,420,149	1,910,302
Financial derivatives	21,618	77,326
Guarantee and commitment obligation	61,234	55,388
Carrying Amount
Financial assets:
Cash and cash equivalents	931,067	1,024,007
Investment securities	17,550,379	16,576,887
Loans	16,321,276	13,204,638
Financial derivatives	44,875	27,789
Guarantee and commitment fees receivable	57,214	50,499
Financial liabilities:
Notes payable	30,822,570	27,371,174
Debt securities of consolidated trusts held by third parties	2,365,435	1,929,628
Financial derivatives	21,618	77,326
Guarantee and commitment obligation	$ 54,770	$ 48,326