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Summary of Significant Accounting Policies - Recent Transactions (Details) - USD ($) $ in Thousands |  | 3 Months Ended
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Feb. 28, 2019 | Mar. 31, 2019 | Mar. 31, 2018
Summary Of Significant Accounting Policies |  |  |
Pre-tax gain on sale of branch |  | $ 2,074 | $ 0
Hawthorn Bank | Branch Located in Branson, Missouri |  |  |
Summary Of Significant Accounting Policies |  |  |
Deposit Assets | $ 10,600 |  |
Pre-tax gain on sale of branch | 2,100 |  |
Gain on sale of branch, net of tax | $ 1,600 |  |

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