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Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net increase to beginning retained earnings	$ 370,477	$ 319,396
Revenue, performance obligation, description of timing	one year or less
Contract liabilities	$ 2,000	1,800
Insurance
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract assets	4,700	4,300
Wealth management services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract assets	2,000	1,800
ASC 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net increase to beginning retained earnings			$ 1,800
ASC 606 \| Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net increase to beginning retained earnings			$ 1,800
Contingent income
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract assets	$ 2,200	$ 1,900