Loan Quality (Troubled Debt Restructuring Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013 loan		Jun. 30, 2013 loan		Jun. 30, 2012 loan	Dec. 31, 2012 loan
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Number of Contracts	20		20			19
Troubled Debt Restructurings: Recorded Investment	$ 20,125		$ 20,125			$ 11,430
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Number of Contracts	0		0			0
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Recorded Investment	0		0			0
Troubled Debt Restructurings, New During Period, Number of Contracts	2		3		8
Troubled Debt Restructurings, New During Period, Pre-TDR Modification	8,089		10,533		5,146
Troubled Debt Restructurings, New During Period, After-TDR Modification	8,089		10,820		5,361
Troubled Debt Restructurings, New During Period, Recorded Investment	8,089		10,734		4,426
Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	20,125	[1]	20,125	[1]		11,430	[1]
Nonperforming [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	0	[1]	0	[1]		0	[1]
Residential Real Estate - Construction [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Number of Contracts	2		2			2
Troubled Debt Restructurings: Recorded Investment	1,454		1,454			1,482
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Number of Contracts	0		0			0
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Recorded Investment	0		0			0
Troubled Debt Restructurings, New During Period, Number of Contracts					3
Troubled Debt Restructurings, New During Period, Pre-TDR Modification					2,073
Troubled Debt Restructurings, New During Period, After-TDR Modification					1,897
Troubled Debt Restructurings, New During Period, Recorded Investment					1,523
Troubled Debt Restructurings, New During Period, Concession					multiple
Residential Real Estate - Construction [Member] | Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	1,454	[1]	1,454	[1]		1,482	[1]
Residential Real Estate - Construction [Member] | Nonperforming [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	0	[1]	0	[1]		0	[1]
Residential Real Estate 1-4 Family [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Number of Contracts	5		5			4
Troubled Debt Restructurings: Recorded Investment	433		433			467
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Number of Contracts	0		0			0
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Recorded Investment	0		0			0
Troubled Debt Restructurings, New During Period, Number of Contracts	1		1		1
Troubled Debt Restructurings, New During Period, Pre-TDR Modification	75		75		150
Troubled Debt Restructurings, New During Period, After-TDR Modification	75		75		150
Troubled Debt Restructurings, New During Period, Recorded Investment	75		75		148
Troubled Debt Restructurings, New During Period, Concession	multiple		multiple		multiple
Residential Real Estate 1-4 Family [Member] | Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	433	[1]	433	[1]		467	[1]
Residential Real Estate 1-4 Family [Member] | Nonperforming [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	0	[1]	0	[1]		0	[1]
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					2
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					1,681
Troubled Debt Restructurings, New During Period, Concession					maturity
Commercial, Industrial And Agricultural [Member] | Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment						1,812	[1]
Commercial, Industrial And Agricultural [Member] | Nonperforming [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment						0	[1]
Commercial, Industrial And Agricultural Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Number of Contracts	13		13			11
Troubled Debt Restructurings: Recorded Investment	18,238		18,238			7,669
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Number of Contracts	0		0			0
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Recorded Investment	0		0			0
Troubled Debt Restructurings, New During Period, Number of Contracts	1		2		2
Troubled Debt Restructurings, New During Period, Pre-TDR Modification	8,014		10,458		700
Troubled Debt Restructurings, New During Period, After-TDR Modification	8,014		10,745		1,091
Troubled Debt Restructurings, New During Period, Recorded Investment	8,014		10,659		1,074
Troubled Debt Restructurings, New During Period, Concession	multiple		multiple		multiple
Commercial, Industrial And Agricultural Real Estate [Member] | Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	18,238	[1]	18,238	[1]		7,669	[1]
Commercial, Industrial And Agricultural Real Estate [Member] | Nonperforming [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructurings: Recorded Investment	$ 0	[1]	$ 0	[1]		$ 0	[1]

[1] The performing status is determined by the loan's compliance with the modified terms