LOANS HELD FOR INVESTMENT, NET - Deferral Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
CARES Act Loan [Abstract]
Total Loans	$ 10,731,845	$ 10,566,831
Principal balances outstanding	3,325
One-to-four family residential and cooperative/condominium apartment
CARES Act Loan [Abstract]
Total Loans	799,321	773,321
Principal balances outstanding	2,850
Commercial real estate ("CRE")
CARES Act Loan [Abstract]
Total Loans	4,510,968	4,457,630
Commercial and Industrial ("C&I") Loans
CARES Act Loan [Abstract]
Total Loans	1,074,930	$ 1,071,712
Principal balances outstanding	$ 475