Fair Value Disclosures - Change in Contingent Consideration Liability (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Change in Contingent Consideration Liability [Roll Forward]
Beginning Balance	$ 339	$ 5,999
Contingent Consideration from New Acquisition	0	0
Payment of Contingent Consideration	67	5,380
Adjustment of Contingent Consideration	38	(260)
Ending Balance	310	359
Sterner Insurance Associates Inc [Member]
Change in Contingent Consideration Liability [Roll Forward]
Beginning Balance		331
Contingent Consideration from New Acquisition		0
Payment of Contingent Consideration		30
Adjustment of Contingent Consideration		(301)
Ending Balance		0
Girard Partners [Member]
Change in Contingent Consideration Liability [Roll Forward]
Beginning Balance	339	5,668
Contingent Consideration from New Acquisition	0	0
Payment of Contingent Consideration	67	5,350
Adjustment of Contingent Consideration	38	41
Ending Balance	$ 310	$ 359