Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net increase to beginning retained earnings	$ 418,413	$ 370,477
Insurance
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net increase to beginning retained earnings	5,200	4,700
Wealth management services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net increase to beginning retained earnings	2,200	2,000
Contingent income
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract assets	2,500	2,200
Contract liabilities	$ 2,000	$ 2,000