SECURITIES - Securities From Issuers In Excess Of Ten Percent Of Consolidated Stockholders' Equity (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Securities
Debt securities available-for-sale, at fair value	$ 386,864	$ 394,226
Stockholders' Equity | Securities Holdings Concentration Risk | Sallie Mae Bank
Securities
Debt securities available-for-sale, at fair value	22,595	23,354
Stockholders' Equity | Securities Holdings Concentration Risk | Velocity Commercial Capital
Securities
Debt securities available-for-sale, at fair value	18,355	19,551
Stockholders' Equity | Securities Holdings Concentration Risk | Nelnet Student Loan Trust
Securities
Debt securities available-for-sale, at fair value	$ 12,663	$ 13,169