SEGMENTS (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) segment	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			4
Interest income	$ 22,553	$ 8,702	$ 41,268	$ 16,445
Total interest expense	16,880	5,828	31,012	10,495
Net interest income	5,673	2,874	10,256	5,950
Provision for loan credit losses	2,575	0	3,893	0
Net interest income after provision for loan credit losses	3,098	2,874	6,363	5,950
Noninterest income	46,428	25,411	89,215	47,639
Noninterest expense	40,180	15,652	79,377	30,361
Income tax expense (benefit)	2,524	(886)	(2,339)	57
Net income (loss)	6,822	13,519	18,540	23,171
Less: Net loss attributable to noncontrolling interests	(31)	0	(31)	0
Net income attributable to NewtekOne, Inc.	6,853	$ 13,519	18,571	$ 23,171
Collateralized deposit	1,439,111		1,439,111		$ 998,902
Operating Segments | Banking
Segment Reporting Information [Line Items]
Interest income	8,112		11,852
Total interest expense	4,212		5,893
Net interest income	3,900		5,959
Provision for loan credit losses	2,575		3,893
Net interest income after provision for loan credit losses	1,325		2,066
Noninterest income	24,608		34,825
Noninterest expense	17,046		30,512
Income tax expense (benefit)	2,915		2,220
Net income (loss)	5,972		4,159
Less: Net loss attributable to noncontrolling interests	0		0
Net income attributable to NewtekOne, Inc.	5,972		4,159
Collateralized deposit	594,825		594,825
Operating Segments | Technology
Segment Reporting Information [Line Items]
Interest income	0		0
Total interest expense	0		246
Net interest income	0		(246)
Provision for loan credit losses	0		0
Net interest income after provision for loan credit losses	0		(246)
Noninterest income	8,257		16,487
Noninterest expense	7,475		15,195
Income tax expense (benefit)	5		89
Net income (loss)	777		957
Less: Net loss attributable to noncontrolling interests	0		0
Net income attributable to NewtekOne, Inc.	777		957
Collateralized deposit	26,082		26,082
Operating Segments | NSBF
Segment Reporting Information [Line Items]
Interest income	12,758		25,973
Total interest expense	6,633		13,292
Net interest income	6,125		12,681
Provision for loan credit losses	0		0
Net interest income after provision for loan credit losses	6,125		12,681
Noninterest income	6,678		26,310
Noninterest expense	6,135		18,757
Income tax expense (benefit)	20		40
Net income (loss)	6,648		20,194
Less: Net loss attributable to noncontrolling interests	0		0
Net income attributable to NewtekOne, Inc.	6,648		20,194
Collateralized deposit	711,951		711,951
Operating Segments | Payments
Segment Reporting Information [Line Items]
Interest income	504		1,145
Total interest expense	843		1,810
Net interest income	(339)		(665)
Provision for loan credit losses	0		0
Net interest income after provision for loan credit losses	(339)		(665)
Noninterest income	11,746		22,812
Noninterest expense	8,277		16,221
Income tax expense (benefit)	314		445
Net income (loss)	2,816		5,481
Less: Net loss attributable to noncontrolling interests	(31)		(31)
Net income attributable to NewtekOne, Inc.	2,847		5,512
Collateralized deposit	51,721		51,721
Corporate and Other
Segment Reporting Information [Line Items]
Interest income	2,243		4,823
Total interest expense	6,256		12,296
Net interest income	(4,013)		(7,473)
Provision for loan credit losses	0		0
Net interest income after provision for loan credit losses	(4,013)		(7,473)
Noninterest income	29,878		34,767
Noninterest expense	8,038		16,257
Income tax expense (benefit)	(730)		(5,133)
Net income (loss)	18,557		16,170
Less: Net loss attributable to noncontrolling interests	0		0
Net income attributable to NewtekOne, Inc.	18,557		16,170
Collateralized deposit	625,514		625,514
Eliminations
Segment Reporting Information [Line Items]
Interest income	1,064		2,525
Total interest expense	1,064		2,525
Net interest income	0		0
Provision for loan credit losses	0		0
Net interest income after provision for loan credit losses	0		0
Noninterest income	34,739		45,986
Noninterest expense	6,791		17,565
Income tax expense (benefit)	0		0
Net income (loss)	27,948		28,421
Less: Net loss attributable to noncontrolling interests	0		0
Net income attributable to NewtekOne, Inc.	27,948		28,421
Collateralized deposit	$ 570,982		$ 570,982