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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
contract
Sep. 30, 2016
contract
Sep. 30, 2017
USD ($)
Loans
contract
Sep. 30, 2016
USD ($)
Loans
contract
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Financing Receivable, Modifications [Line Items]            
Outstanding Recorded Investment $ 2,722   $ 2,722   $ 3,109  
Reserves specific to modified loans 26   26   $ 82  
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0   $ 0      
Defaults on troubled debt restructurings | contract 0 0 0 0    
Commercial and industrial            
Financing Receivable, Modifications [Line Items]            
Outstanding Recorded Investment $ 113   $ 113      
Number of Loans | Loans     2      
Pre-Modification Outstanding Recorded Investment     $ 121      
Principal Modification     0      
Post Modification Outstanding Recorded Investment     125      
Real Estate | Agricultural real estate            
Financing Receivable, Modifications [Line Items]            
Outstanding Recorded Investment 51   $ 51      
Number of Loans | Loans     1      
Pre-Modification Outstanding Recorded Investment     $ 59      
Principal Modification     0      
Post Modification Outstanding Recorded Investment     59      
Consumer | Equity loans and lines of credit            
Financing Receivable, Modifications [Line Items]            
Outstanding Recorded Investment $ 62   $ 62      
Number of Loans | Loans     1      
Pre-Modification Outstanding Recorded Investment     $ 62      
Principal Modification     0      
Post Modification Outstanding Recorded Investment     $ 66      
Commercial | Commercial and industrial            
Financing Receivable, Modifications [Line Items]            
Outstanding Recorded Investment           $ 42
Number of Loans | Loans     2 2    
Pre-Modification Outstanding Recorded Investment       $ 45    
Principal Modification       0    
Post Modification Outstanding Recorded Investment       $ 45