SECURITIES - Securities From Issuers In Excess Of Ten Percent Of Consolidated Stockholders' Equity (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt securities available-for-sale, at fair value	$ 403,589	$ 392,968
Stockholders' Equity | Securities Holdings Concentration Risk | Sallie Mae Bank securities
Debt securities available-for-sale, at fair value	29,712	25,737
Stockholders' Equity | Securities Holdings Concentration Risk | Nelnet Student Loan Trust
Debt securities available-for-sale, at fair value	16,904	15,486
Stockholders' Equity | Securities Holdings Concentration Risk | Velocity Commercial Capital
Debt securities available-for-sale, at fair value	25,583
Stockholders' Equity | Securities Holdings Concentration Risk | Navient Student Loan Trust
Debt securities available-for-sale, at fair value	$ 11,739	$ 13,179