CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - UNAUDITED - USD ($) $ in Thousands		Total	Common Stock	Additional Paid in Capital	Accumulated Deficit
Balance, beginning of period (in shares) at Dec. 31, 2019	[1]		6,123,432
Balance, beginning of period at Dec. 31, 2019	[1]	$ 34,630	$ 1	$ 62,164	$ (27,535)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(4,534)			(4,534)
Capital contribution from Customers Bank		864		864
Balance, end of period (in shares) at Mar. 31, 2020			6,123,432
Balance, end of period at Mar. 31, 2020		30,960	$ 1	63,028	(32,069)
Balance, beginning of period (in shares) at Dec. 31, 2019	[1]		6,123,432
Balance, beginning of period at Dec. 31, 2019	[1]	34,630	$ 1	62,164	(27,535)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(8,403)
Balance, end of period (in shares) at Sep. 30, 2020			6,123,432
Balance, end of period at Sep. 30, 2020		26,271	$ 1	62,208	(35,938)
Balance, beginning of period (in shares) at Dec. 31, 2019	[1]		6,123,432
Balance, beginning of period at Dec. 31, 2019	[1]	34,630	$ 1	62,164	(27,535)
Balance, end of period (in shares) at Dec. 31, 2020	[1]		6,123,432
Balance, end of period at Dec. 31, 2020	[1]	24,690	$ 1	64,017	(39,328)
Balance, beginning of period (in shares) at Mar. 31, 2020			6,123,432
Balance, beginning of period at Mar. 31, 2020		30,960	$ 1	63,028	(32,069)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(4,119)			(4,119)
Capital contribution from Customers Bank		401		401
Balance, end of period (in shares) at Jun. 30, 2020			6,123,432
Balance, end of period at Jun. 30, 2020		27,242	$ 1	63,429	(36,188)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		250			250
Capital contribution from Customers Bank		(1,221)		(1,221)
Balance, end of period (in shares) at Sep. 30, 2020			6,123,432
Balance, end of period at Sep. 30, 2020		26,271	$ 1	62,208	(35,938)
Balance, beginning of period (in shares) at Dec. 31, 2020	[1]		6,123,432
Balance, beginning of period at Dec. 31, 2020	[1]	24,690	$ 1	64,017	(39,328)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		18,889			18,889
Valuation of private warrants		(30,839)		(30,839)
Recapitalization transaction (in shares)			6,076,946
Recapitalization transaction		16,148		16,148
Balance, end of period (in shares) at Mar. 31, 2021			12,200,378
Balance, end of period at Mar. 31, 2021		28,888	$ 1	49,326	(20,439)
Balance, beginning of period (in shares) at Dec. 31, 2020	[1]		6,123,432
Balance, beginning of period at Dec. 31, 2020	[1]	24,690	$ 1	64,017	(39,328)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		25,847
Balance, end of period (in shares) at Sep. 30, 2021			12,206,378
Balance, end of period at Sep. 30, 2021		35,899	$ 1	49,379	(13,481)
Balance, beginning of period (in shares) at Mar. 31, 2021			12,200,378
Balance, beginning of period at Mar. 31, 2021		28,888	$ 1	49,326	(20,439)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(1,836)			(1,836)
Balance, end of period (in shares) at Jun. 30, 2021			12,200,378
Balance, end of period at Jun. 30, 2021		27,052	$ 1	49,326	(22,275)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		8,794			8,794
Issuance of common stock (in shares)			6,000
Issuance of common stock		53		53
Balance, end of period (in shares) at Sep. 30, 2021			12,206,378
Balance, end of period at Sep. 30, 2021		$ 35,899	$ 1	$ 49,379	$ (13,481)

[1] Retroactively restated in connection with the merger.