Loan Quality (Troubled Debt Restructing Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 loan	Mar. 31, 2012 loan	Dec. 31, 2012 loan
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Number of Contracts	18		19
Troubled Debt Restructurings: Recorded Investment	$ 12,167		$ 11,430
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Number of Contracts	0		0
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Recorded Investment	0		0
Troubled Debt Restructurings, New During Period, Number of Contracts		9
Troubled Debt Restructurings, New During Period, Pre-TDR Modification		5,146
Troubled Debt Restructurings, New During Period, After-TDR Modification		5,361
Troubled Debt Restructurings, New During Period, Recorded Investment		5,309
Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	12,167		11,430
Nonperforming [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	0		0
Residential Real Estate - Construction [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Number of Contracts	2		2
Troubled Debt Restructurings: Recorded Investment	1,476		1,482
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Number of Contracts	0		0
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Recorded Investment	0		0
Residential Real Estate - Construction [Member] | Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	1,476		1,482
Residential Real Estate - Construction [Member] | Nonperforming [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	0		0
Residential Real Estate 1-4 Family [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Number of Contracts	4		4
Troubled Debt Restructurings: Recorded Investment	464		467
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Number of Contracts	0		0
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Recorded Investment	0		0
Troubled Debt Restructurings, New During Period, Number of Contracts		3
Troubled Debt Restructurings, New During Period, Pre-TDR Modification		1,261
Troubled Debt Restructurings, New During Period, After-TDR Modification		1,086
Troubled Debt Restructurings, New During Period, Recorded Investment		907
Residential Real Estate 1-4 Family [Member] | Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	464		467
Residential Real Estate 1-4 Family [Member] | Nonperforming [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	0		0
Commercial, industrial and agricultural [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Number of Contracts			2
Troubled Debt Restructurings: Recorded Investment			1,812
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Number of Contracts			0
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Recorded Investment			0
Troubled Debt Restructurings, New During Period, Number of Contracts		3
Troubled Debt Restructurings, New During Period, Pre-TDR Modification		2,223
Troubled Debt Restructurings, New During Period, After-TDR Modification		2,223
Troubled Debt Restructurings, New During Period, Recorded Investment		2,360
Commercial, industrial and agricultural [Member] | Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment			1,812
Commercial, industrial and agricultural [Member] | Nonperforming [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	0		0
Commercial, industrial and agricultural real estate [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Number of Contracts	12		11
Troubled Debt Restructurings: Recorded Investment	10,227		7,669
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Number of Contracts	0		0
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Recorded Investment	0		0
Troubled Debt Restructurings, New During Period, Number of Contracts	1	3
Troubled Debt Restructurings, New During Period, Pre-TDR Modification	2,444	1,662
Troubled Debt Restructurings, New During Period, After-TDR Modification	2,731	2,052
Troubled Debt Restructurings, New During Period, Recorded Investment	2,727	2,042
Commercial, industrial and agricultural real estate [Member] | Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	10,227		7,669
Commercial, industrial and agricultural real estate [Member] | Nonperforming [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	0		0
Loan Concessions: Maturity [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings, New During Period, Number of Contracts		3
Troubled Debt Restructurings, New During Period, Pre-TDR Modification		2,223
Troubled Debt Restructurings, New During Period, After-TDR Modification		2,223
Troubled Debt Restructurings, New During Period, Recorded Investment		2,360
Loan Concessions: Multiple [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings, New During Period, Number of Contracts	1	6
Troubled Debt Restructurings, New During Period, Pre-TDR Modification	2,444	2,923
Troubled Debt Restructurings, New During Period, After-TDR Modification	2,731	3,138
Troubled Debt Restructurings, New During Period, Recorded Investment	$ 2,727	$ 2,949