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Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 294,553		$ 265,007
Contract with customer, liability	1,500	$ 1,700
Insurance
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer, asset, net	4,600		4,000
Wealth Management
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer, asset, net	$ 1,900		$ 1,900
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

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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