Fair Value Disclosures - Change in Contingent Consideration Liability (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 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	5,317
Adjustment of Contingent Consideration	28	(275)
Ending Balance	300	407
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		0
Adjustment of Contingent Consideration		(303)
Ending Balance		28
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	5,317
Adjustment of Contingent Consideration	28	28
Ending Balance	$ 300	$ 379