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Loans and Allowance - Summary of Troubled Debt Restructurings (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
loan
Jun. 30, 2015
USD ($)
loan
Jun. 30, 2016
USD ($)
loan
Jun. 30, 2015
USD ($)
loan
Financing Receivable, Modifications [Line Items]        
Pre-Modification Recorded Balance $ 4,854 $ 1,943 $ 6,044 $ 4,408
Post-Modification Recorded Balance $ 4,795 $ 1,944 $ 5,871 $ 5,152
Number of Loans | loan 9 4 18 11
Commercial and industrial loans        
Financing Receivable, Modifications [Line Items]        
Pre-Modification Recorded Balance $ 1,386 $ 260 $ 3,748
Post-Modification Recorded Balance $ 536 $ 260 $ 1,897
Number of Loans | loan 1 3 5
Agricultural production financing and other loans to farmers        
Financing Receivable, Modifications [Line Items]        
Pre-Modification Recorded Balance $ 1,141   $ 1,606  
Post-Modification Recorded Balance $ 1,141   $ 1,472  
Number of Loans | loan 3   5  
Real estate loans - Construction        
Financing Receivable, Modifications [Line Items]        
Pre-Modification Recorded Balance     $ 79
Post-Modification Recorded Balance     $ 80
Number of Loans | loan     1
Real estate loans - Commercial and farmland        
Financing Receivable, Modifications [Line Items]        
Pre-Modification Recorded Balance $ 3,539 $ 537 $ 3,891 $ 537
Post-Modification Recorded Balance $ 3,508 $ 537 $ 3,860 $ 2,280
Number of Loans | loan 5 1 6 2
Real estate loans - Residential        
Financing Receivable, Modifications [Line Items]        
Pre-Modification Recorded Balance $ 20 $ 113 $ 44
Post-Modification Recorded Balance $ 871 $ 133 $ 895
Number of Loans | loan 2 3 3
Real estate loans - Home Equity        
Financing Receivable, Modifications [Line Items]        
Pre-Modification Recorded Balance $ 174   $ 174  
Post-Modification Recorded Balance $ 146   $ 146  
Number of Loans | loan 1   1