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Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 279,830			$ 265,007
Contract liabilities		$ 600	$ 1,700
Insurance
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract receivables	3,500			4,000
Wealth Management
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract receivables	$ 1,900			$ 1,900
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings			$ 1,800

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