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Summary of Significant Accounting Policies - Recent Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended
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