NEWTEKONE, INC. - PARENT COMPANY ONLY - Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2023	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Income Statements, Captions [Line Items]
Interest income	$ 26,736	$ 22,553	$ 18,715	$ 41,268	$ 68,004	$ 94,373	$ 38,617	$ 78,966
Interest expense	18,659	16,880	14,132	31,012	49,671	67,739	26,325	20,515
Net interest income	8,077	5,673	4,583	10,256	18,333	26,634	12,292	58,451
Noninterest income
Dividends						1,757	24,657	9,896
All other operating income	21,897	24,550	29,280	53,830	75,727	23,762	34,221	10,295
Total noninterest income						176,772	92,878	89,310
Noninterest expense
Salaries and employee benefits	13,726	18,374	19,073	37,447	51,173	65,708	20,186	17,866
Other expenses						22,357	7,673	7,454
Total noninterest expense						146,329	66,395	62,292
Net income before taxes						45,373	38,775	85,469
Income tax benefit	3,416	2,595	(11,952)	(9,357)	(5,941)	(1,956)	6,464	1,327
Net income	$ 10,919	$ 7,011	$ 18,550	$ 25,561	$ 36,480	47,329	32,311	84,142
Net income available to common shareholders						45,875	$ 32,311	$ 84,142
Parent Company
Condensed Income Statements, Captions [Line Items]
Interest income						2,319
Interest expense						18,797
Net interest income						(16,478)
Noninterest income
Dividends						60,317
All other operating income						(2,345)
Total noninterest income						57,972
Noninterest expense
Salaries and employee benefits						9,365
Other expenses						10,962
Total noninterest expense						20,327
Net income before taxes						21,167
Income tax benefit						(14,837)
Net income						36,004
Equity in Undistributed (earnings) losses of subs						26,813
Net income available to common shareholders						$ 62,817