Fair Value Disclosures - Change in Contingent Consideration Liability (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Change in Contingent Consideration Liability [Roll Forward]
Beginning Balance	$ 5,999	$ 5,577
Contingent Consideration from New Acquisition	0	0
Payment of Contingent Consideration	5,380	2,519
Adjustment of Contingent Consideration	(260)	853
Ending Balance	359	3,911
Sterner Insurance Associates Inc [Member]
Change in Contingent Consideration Liability [Roll Forward]
Beginning Balance	331	1,144
Contingent Consideration from New Acquisition	0	0
Payment of Contingent Consideration	30	1,325
Adjustment of Contingent Consideration	(301)	501
Ending Balance	0	320
Girard Partners [Member]
Change in Contingent Consideration Liability [Roll Forward]
Beginning Balance	5,668	4,241
Contingent Consideration from New Acquisition	0	0
Payment of Contingent Consideration	5,350	934
Adjustment of Contingent Consideration	41	284
Ending Balance	$ 359	3,591
John T. Fretz Insurance Agency [Member]
Change in Contingent Consideration Liability [Roll Forward]
Beginning Balance		192
Contingent Consideration from New Acquisition		0
Payment of Contingent Consideration		260
Adjustment of Contingent Consideration		68
Ending Balance		$ 0