SECURITIES - Securities From Issuers In Excess Of Ten Percent Of Consolidated Stockholders' Equity (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 392,968	$ 373,444
Stockholders' Equity | Securities Holdings Concentration Risk | Sallie Mae Bank securities
Debt Securities, Available-for-Sale, Excluding Accrued Interest	25,737	$ 17,362
Stockholders' Equity | Securities Holdings Concentration Risk | Nelnet Student Loan Trust
Debt Securities, Available-for-Sale, Excluding Accrued Interest	15,486
Stockholders' Equity | Securities Holdings Concentration Risk | Navient Student Loan Trust
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 13,179