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Loans, Past Due And Accruing Restructured (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Financing receivables, non accruals, past due, and accruing restructured loans [Line Items]    
Total non-accrual loans $ 3,869 $ 5,725
Past-due 90 days or more and still accruing 12 23
Total non-accrual and past-due 90 days or more and still accruing 3,881 5,748
Accruing restructured loans 11,606 11,731
Total 15,487 17,479
Commercial and industrial [Member]    
Financing receivables, non accruals, past due, and accruing restructured loans [Line Items]    
Total non-accrual loans 0 0
Commercial Secured By Real Estate [Member]    
Financing receivables, non accruals, past due, and accruing restructured loans [Line Items]    
Total non-accrual loans 2,609 4,312
Agricultural [Member]    
Financing receivables, non accruals, past due, and accruing restructured loans [Line Items]    
Total non-accrual loans 334 334
Residential Real Estate [Member]    
Financing receivables, non accruals, past due, and accruing restructured loans [Line Items]    
Total non-accrual loans 926 1,079
Consumer [Member]    
Financing receivables, non accruals, past due, and accruing restructured loans [Line Items]    
Total non-accrual loans $ 0 $ 0