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Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Retained earnings | $ 308,121 |  | $ 265,007
Contract with customer, liability | $ 600 | $ 1,700 |
Revenue, performance obligation, description of timing | one year |  |
Insurance |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Contract with customer, asset, net | $ 3,800 |  | 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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