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Accounting Standards Updates Accounting Standards Updates (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings |  | $ 308,121 |  | $ 308,121 |  | $ 265,007
Noninterest income |  | $ 18,603 | $ 17,202 | $ 57,591 | $ 51,892 |
Accounting Standards Update 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of new accounting principle |  |  |  |  |  | 1,780
Accounting Standards Update 2016-01 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of new accounting principle | $ 65 |  |  |  |  | 0
Accounting Standards Update 2018-02 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassified from AOCI to retained earnings due to Tax Cuts and Jobs Act |  |  |  |  |  | $ 10,000
Difference between Revenue Guidance in Effect before and after Topic 606 | Contingent commissions | Insurance Business Segment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Noninterest income | 1,800 |  |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings | $ 1,800 |  |  |  |  |

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