REVENUES - Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($)
Revenue from Contract with Customer [Abstract]
Number of reportable segments | segment			1
Disaggregation of Revenue [Line Items]
Total revenues	$ 14,077	$ 14,381	$ 42,799	$ 40,393
Interchange and card revenue
Disaggregation of Revenue [Line Items]
Total revenues	2,990	2,292	8,689	6,716
Servicing fees
Disaggregation of Revenue [Line Items]
Total revenues	7,557	8,658	23,397	22,990
Account fees
Disaggregation of Revenue [Line Items]
Total revenues	1,680	1,931	5,580	5,981
University fees
Disaggregation of Revenue [Line Items]
Total revenues	1,712	1,412	4,793	4,291
Other revenue
Disaggregation of Revenue [Line Items]
Total revenues	138	88	340	415
Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Total revenues	12,696	13,148	38,788	36,481
Revenue recognized at a point in time | Interchange and card revenue
Disaggregation of Revenue [Line Items]
Total revenues	2,990	2,292	8,689
Revenue recognized at a point in time | Servicing fees
Disaggregation of Revenue [Line Items]
Total revenues	7,557	8,658	23,397
Revenue recognized at a point in time | Account fees
Disaggregation of Revenue [Line Items]
Total revenues	1,680	1,931	5,580
Revenue recognized at a point in time | University fees
Disaggregation of Revenue [Line Items]
Total revenues	433	207	1,030	639
Revenue recognized at a point in time | Other revenue
Disaggregation of Revenue [Line Items]
Total revenues	36	60	92	155
Revenue recognized over time
Disaggregation of Revenue [Line Items]
Total revenues	1,381	1,233	4,011	3,912
Revenue recognized over time | University fees
Disaggregation of Revenue [Line Items]
Total revenues	1,279	1,205	3,763	3,652
Revenue recognized over time | Other revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 102	$ 28	$ 248	$ 260