Loans (Details 8) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Numbers	Dec. 31, 2013 Numbers	Dec. 31, 2012 Numbers
Commercial Working Capital [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings That Subsequently Defaulted, Number of Loans	2	1	1
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment	$ 868	$ 149	$ 529
Subsequently Defaulted [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings That Subsequently Defaulted, Number of Loans	9	18	23
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment	1,991	2,438	3,515
Subsequently Defaulted [Member] | Residential Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings That Subsequently Defaulted, Number of Loans	1	6	6
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment	80	409	462
Subsequently Defaulted [Member] | Residential Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings That Subsequently Defaulted, Number of Loans	1	0	2
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment	178	0	203
Subsequently Defaulted [Member] | Commercial Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings That Subsequently Defaulted, Number of Loans	0	2	0
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment	0	290	0
Subsequently Defaulted [Member] | Commercial Real Estate Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings That Subsequently Defaulted, Number of Loans	0	1	3
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment	0	212	555
Subsequently Defaulted [Member] | Agriculture Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings That Subsequently Defaulted, Number of Loans	0	0	0
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment	0	0	0
Subsequently Defaulted [Member] | Commercial Real Estate Other Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings That Subsequently Defaulted, Number of Loans	0	1	0
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment	0	323	0
Subsequently Defaulted [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings That Subsequently Defaulted, Number of Loans	5	4	4
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment	865	740	1,600
Subsequently Defaulted [Member] | Home Equity and Home Improvement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings That Subsequently Defaulted, Number of Loans	0	3	7
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment	0	315	166
Subsequently Defaulted [Member] | Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Restructurings That Subsequently Defaulted, Number of Loans	0	0	0
Troubled Debt Restructurings That Subsequently Defaulted, Recorded Investment	$ 0	$ 0	$ 0