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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
contract
Jun. 30, 2016
USD ($)
contract
Jun. 30, 2017
USD ($)
Loans
contract
Jun. 30, 2016
USD ($)
Loans
contract
Dec. 31, 2016
USD ($)
Financing Receivable, Modifications [Line Items]          
Outstanding Recorded Investment $ 2,847   $ 2,847   $ 3,109
Reserves specific to modified loans 30   30   $ 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 $ 123 $ 44 $ 123 $ 44  
Number of Loans | Loans     2 2  
Pre-Modification Outstanding Recorded Investment     $ 121 $ 45  
Principal Modification     0 0  
Post Modification Outstanding Recorded Investment     125 $ 45  
Agricultural real estate          
Financing Receivable, Modifications [Line Items]          
Outstanding Recorded Investment 59   $ 59    
Number of Loans | Loans     1    
Pre-Modification Outstanding Recorded Investment     $ 59    
Principal Modification     0    
Post Modification Outstanding Recorded Investment     59    
Equity loans and lines of credit          
Financing Receivable, Modifications [Line Items]          
Outstanding Recorded Investment $ 64   $ 64    
Number of Loans | Loans     1    
Pre-Modification Outstanding Recorded Investment     $ 62    
Principal Modification     0    
Post Modification Outstanding Recorded Investment     $ 66