Financial Derivatives (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Spread on written credit derivatives		31.00%
Written credit derivative spread threshold		20.00%	20.00%
Credit Default Swap, Selling Protection [Member]
Derivative [Line Items]
Credit risk derivative in excess of threshold, at fair value, net		$ (33)	$ (38)
Total net up-front payments received	$ 800	$ 800
Minimum
Derivative [Line Items]
Spread on written credit derivatives			11.30%
Upfront points on written credit derivative in excess of threshold		46.3	55.4
Maximum
Derivative [Line Items]
Spread on written credit derivatives			14.10%
Upfront points on written credit derivative in excess of threshold		88.8	85.2