RESTATEMENT AND REVISION OF PREVIOUSLY REPORTED CONSOLIDATED FINANCIAL STATEMENTS - CONSOLIDATED STATEMENTS OF INCOME (LOSS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	$ 22,931	$ 22,464	$ 24,276	$ 46,740	$ 69,671	$ 94,987	$ 66,437
Technology, communication, and processing	4,893	8,627	8,355	16,982	21,875	28,973	27,404
Salaries and employee benefits	9,137	9,559	8,557	18,116	27,253	38,036	26,076
Professional services	3,496	2,126	1,737	3,863	7,359	10,395	9,304
Provision for operating losses	1,067	1,401	1,329	2,730	3,797	5,419	5,170
Occupancy	282	284	352	636	918	1,197	1,428
Customer related supplies	1,017	186	475	661	1,678	2,214	3,236
Advertising and promotion	176	125	191	316	492	654	941
Merger and acquisition related expenses	0	0	0	0	0	65	739
Other expense	614	466	457	923	1,537	2,368	2,935
Total operating expenses	20,682	22,774	21,453	44,227	64,909	89,321	77,233
Income (loss) from operations	2,249	(310)	2,823	2,513	4,762	5,666	(10,796)
Gain on fair value of private warrant liability	6,042	(3,056)	15,003	11,947	17,989	17,225	0
Interest expense	0	(42)	(54)	(96)	(96)	(96)	(1,395)
Income (loss) before income tax expense	8,291	(3,408)	17,772	14,364	22,655	22,795	(12,191)
Income tax expense	1,167	1,382	1,713	3,095	4,262	5,752	23
Net income (loss)	$ 7,124	$ (4,790)	$ 16,059	$ 11,269	$ 18,393	$ 17,043	$ (12,214)
Weighted average number of shares outstanding - basic (in shares)	11,900	11,900	11,698	11,800	11,834	11,851	6,123
Weighted average number of shares outstanding - diluted (in shares)	11,904	11,900	15,325	13,791	12,359	11,939	6,123
Net Income (loss) per share - basic (in dollars per share)	$ 600	$ (400)	$ 1,370	$ 960	$ 1,550	$ 1.44	$ (1.99)
Net Income (loss) per share - diluted (in dollars per share)	$ 0.60	$ (0.40)	$ 0.07	$ (0.05)	$ 30.00	$ 1.43	$ (1.99)
Interchange and card revenue
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	$ 6,529	$ 6,757	$ 8,244	$ 15,001	$ 21,530	$ 28,078	$ 25,864
Servicing fees from Partner Bank
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	11,823	10,579	9,372	19,951	31,774	45,105	22,465
Account fees
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	2,628	2,641	2,686	5,327	7,955	10,668	11,308
University fees
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	1,474	1,331	1,324	2,655	4,129	5,693	5,320
Other revenue
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	477	1,156	2,650	3,806	4,283	$ 5,443	1,480
As Previously Reported (Unaudited)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	21,974	22,893	24,383	47,276	69,250		66,858
Technology, communication, and processing	4,596	8,924	8,652	17,576	22,172		27,404
Salaries and employee benefits	6,728	7,170	5,423	12,593	19,321		26,076
Professional services	3,496	2,126	1,737	3,863	7,359		9,304
Provision for operating losses	1,067	1,401	1,329	2,730	3,797		5,170
Occupancy	282	284	352	636	918		1,428
Customer related supplies	1,017	186	475	661	1,678		3,236
Advertising and promotion	176	125	191	316	492		941
Merger and acquisition related expenses	0	0	0	0	0		739
Other expense	614	466	457	923	1,537		2,935
Total operating expenses	17,976	20,682	18,616	39,298	57,274		77,233
Income (loss) from operations	3,998	2,211	5,767	7,978	11,976		(10,375)
Gain on fair value of private warrant liability	6,042	(3,056)	15,003	11,947	17,989		0
Interest expense	0	(42)	(54)	(96)	(96)		(1,395)
Income (loss) before income tax expense	10,040	(887)	20,716	19,829	29,869		(11,770)
Income tax expense	1,246	949	1,827	2,776	4,022		23
Net income (loss)	$ 8,794	$ (1,836)	$ 18,889	$ 17,053	$ 25,847		$ (11,793)
Weighted average number of shares outstanding - basic (in shares)	11,900	11,900	11,900	11,900	11,534		6,123
Weighted average number of shares outstanding - diluted (in shares)	11,904	11,900	15,512	13,314	12,059		6,123
Net Income (loss) per share - basic (in dollars per share)	$ 0.74	$ (0.15)	$ 1.59	$ 1.43	$ 2.24		$ (1.93)
Net Income (loss) per share - diluted (in dollars per share)	$ 0.74	$ (0.15)	$ 0.25	$ 0.38	$ 0.65		$ (1.93)
As Previously Reported (Unaudited) | Interchange and card revenue
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	$ 5,572	$ 7,186	$ 8,351	$ 15,537	$ 21,109		$ 26,285
As Previously Reported (Unaudited) | Servicing fees from Partner Bank
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	11,823	10,579	9,372	19,951	31,774		22,465
As Previously Reported (Unaudited) | Account fees
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	2,628	2,641	2,686	5,327	7,955		11,308
As Previously Reported (Unaudited) | University fees
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	1,474	1,331	1,324	2,655	4,129		5,320
As Previously Reported (Unaudited) | Other revenue
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	477	1,156	2,650	3,806	4,283		1,480
Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	957	(429)	(107)	(536)	421		(421)
Technology, communication, and processing	297	(297)	(297)	(594)	(297)		0
Salaries and employee benefits	2,409	2,389	3,134	5,523	7,932		0
Professional services	0	0	0	0	0		0
Provision for operating losses	0	0	0	0	0		0
Occupancy	0	0	0	0	0		0
Customer related supplies	0	0	0	0	0		0
Advertising and promotion	0	0	0	0	0		0
Merger and acquisition related expenses	0	0	0	0	0		0
Other expense	0	0	0	0	0		0
Total operating expenses	2,706	2,092	2,837	4,929	7,635		0
Income (loss) from operations	(1,749)	(2,521)	(2,944)	(5,465)	(7,214)		(421)
Gain on fair value of private warrant liability	0	0	0	0	0		0
Interest expense	0	0	0	0	0		0
Income (loss) before income tax expense	(1,749)	(2,521)	(2,944)	(5,465)	(7,214)		(421)
Income tax expense	(79)	433	(114)	319	240		0
Net income (loss)	$ (1,670)	$ (2,954)	$ (2,830)	$ (5,784)	$ (7,454)		$ (421)
Weighted average number of shares outstanding - basic (in shares)	0	0	(202)	(100)	300		0
Weighted average number of shares outstanding - diluted (in shares)	0	0	(187)	477	300		0
Net Income (loss) per share - basic (in dollars per share)	$ (0.14)	$ (0.25)	$ (0.22)	$ (0.47)	$ (0.69)		$ (0.06)
Net Income (loss) per share - diluted (in dollars per share)	$ (0.14)	$ (0.25)	$ (0.18)	$ (0.43)	$ (0.62)		$ (0.06)
Restatement Adjustments | Interchange and card revenue
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	$ 957	$ (429)	$ (107)	$ (536)	$ 421		$ (421)
Restatement Adjustments | Servicing fees from Partner Bank
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	0	0	0	0	0		0
Restatement Adjustments | Account fees
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	0	0	0	0	0		0
Restatement Adjustments | University fees
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	0	0	0	0	0		0
Restatement Adjustments | Other revenue
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total operating revenues	$ 0	$ 0	$ 0	$ 0	$ 0		$ 0