Consolidated Statements of Changes in Stockholders Equity - USD ($) $ in Thousands	Common stock IPO	Common stock	Paid-in capital IPO	Paid-in capital	Accumulated other comprehensive (loss) income	Retained deficit	Treasury shares	IPO	Total
Balance at the beginning of the period at Dec. 31, 2016		$ 355		$ 555,289	$ 29,482	$ (204,271)	$ (200)		$ 380,655
Increase (decrease) in Stockholders' Equity
Shares issued/Proceeds from common stock sold in initial public offering, net of offering costs		32							32
Stock based employee compensation plan				1,089					1,089
Capital contributions				49,968					49,968
Net unrealized gain (loss) on investment securities, net of deferred tax expense					(18,649)				(18,649)
Foreign currency translation (loss)					6,881				6,881
Reclassification of stranded deferred taxes					1,583	(1,583)			(1,583)
Net income (loss)						(43,993)			(43,993)
Balance at the end of the period at Dec. 31, 2017		387		606,346	19,297	(249,847)	(200)		375,983
Increase (decrease) in Stockholders' Equity
Shares issued/Proceeds from common stock sold in initial public offering, net of offering costs		2		(2)
Stock based employee compensation plan				916					916
Net unrealized gain (loss) on investment securities, net of deferred tax expense					(41,612)				(41,612)
Net income (loss)						54,543			54,543
Balance at the end of the period at Dec. 31, 2018		389		607,260	(22,315)	(195,304)	(200)		389,830
Increase (decrease) in Stockholders' Equity
Shares issued/Proceeds from common stock sold in initial public offering, net of offering costs	$ 42		$ 50,836					$ 50,878
Stock based employee compensation plan		1		8,578					8,579
Shares cancelled		(1)		1
Retirement of common stock (tax payments on equity compensation)				(740)					(740)
Net unrealized gain (loss) on investment securities, net of deferred tax expense					59,768				59,768
Equity distribution				(4,174)					(4,174)
Net income (loss)						38,890			38,890
Balance at the end of the period at Dec. 31, 2019		$ 431		$ 661,761	$ 37,453	$ (156,414)	$ (200)		$ 543,031