Loans, Past Due And Accruing Restructured (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing receivables, non accruals, past due, and accruing restructured loans [Line Items]
Total non-accrual loans	$ 4,387	$ 5,725
Past-due 90 days or more and still accruing	95	23
Total non-accrual and past-due 90 days or more and still accruing	4,482	5,748
Accruing restructured loans	10,791	11,731
Total	15,273	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	2,840	4,312
Agricultural [Member]
Financing receivables, non accruals, past due, and accruing restructured loans [Line Items]
Total non-accrual loans	367	334
Residential Real Estate [Member]
Financing receivables, non accruals, past due, and accruing restructured loans [Line Items]
Total non-accrual loans	1,180	1,079
Consumer [Member]
Financing receivables, non accruals, past due, and accruing restructured loans [Line Items]
Total non-accrual loans	$ 0	$ 0