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Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Retained earnings | $ 319,396 | $ 265,007 |  |
Revenue, performance obligation, description of timing | one year or less |  |  |
Noninterest Income (in-scope of ASC 606) | $ 65,961 | 63,091 |  |
Noninterest Income (out-of-scope of ASC 606) | 11,488 | 6,113 |  |
Noninterest income | 77,449 | 69,204 | $ 68,808 |
Contract with customer, liability | 1,800 | 1,700 |  |
Insurance |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract with customer, asset, net | 4,300 | 4,000 |  |
Wealth Management |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract with customer, asset, net | 1,800 | 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
Contingent Income [Member] |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Contract with customer, asset, net | $ 1,900 | $ 2,400 |  |

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