SECURITIES - Securities From Issuers In Excess Of Ten Percent Of Consolidated Stockholders' Equity (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt securities available-for-sale, at fair value	$ 405,081	$ 392,968
Stockholders' Equity | Securities Holdings Concentration Risk | Sallie Mae Bank securities
Debt securities available-for-sale, at fair value	27,246	25,737
Stockholders' Equity | Securities Holdings Concentration Risk | Nelnet Student Loan Trust
Debt securities available-for-sale, at fair value	15,525	15,486
Stockholders' Equity | Securities Holdings Concentration Risk | Velocity Commercial Capital
Debt securities available-for-sale, at fair value	25,109
Stockholders' Equity | Securities Holdings Concentration Risk | Navient Student Loan Trust
Debt securities available-for-sale, at fair value	$ 10,931	$ 13,179