Earnings Per Share - Basic and Diluted Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net income (loss) attributable to Conifer									$ (8,437)	$ 64	$ (6,935)
Preferred stock dividends									0	384	191
Paid-in-kind dividends									0	156	59
Deemed dividend on preferred stock									0	0	15
Net income (loss) allocable to common shareholders	$ (4,421)	$ (1,475)	$ (513)	$ (2,028)	$ (2,304)	$ 1,212	$ 366	$ 250	$ (8,437)	$ (476)	$ (7,200)
Weighted average common shares outstanding, basic and diluted (in shares)									7,618,588	5,369,960	2,672,440
Earnings (loss) per share allocable to common, basic and diluted (in dollars per share)									$ (1.11)	$ (0.09)	$ (2.69)