Loans and ALLL (Narrative) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2016 USD ($) NumberofLoan	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructure of Loans through Forbearance of Principal or Accrued Interest | NumberofLoan
Migration analysis of loan portfolio period		5 years
Threshold period of continuous performance to return loans to accrual status		6 months
Advance in connection with impaired loans	$ 117	$ 117	$ 0
Minimum [Member] | 4 - Low satisfactory [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period		10 days
Minimum [Member] | 5 - Special mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period		30 days
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, amortization term		30 years
Maximum [Member] | 4 - Low satisfactory [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period		30 days
Maximum [Member] | 5 - Special mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period		60 days
Commercial, Agricultural, and Residential Portfolio Segments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days past due (or more), accrual of interest discontinued		90 days
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum days of consumer loan charged off		180 days
Consumer [Member] | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, amortization term		12 years
Commercial and Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum percentage of loan		0.80
Commercial and Agricultural [Member] | Customer Concentration Risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum amount of loans		$ 15,000
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum percentage of loan		0.97
Maximum percentage of principal, interest, taxes and hazard insurance on property over gross income		0.28
Maximum percentage of debt servicing over gross income		0.36
Maximum amount without corporation approval		$ 500
Residential, Privately Insured, Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum percentage of loan		0.80