Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 332,779	$ 319,396
Revenue, performance obligation, description of timing	one year
Contract with customer, liability	$ 700	1,800
Insurance
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer, asset, net	3,700	4,300
Wealth Management
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer, asset, net	$ 1,900	$ 1,800
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings			$ 1,800