Loans and Allowance for Loan Losses (Troubled Debt Restructurings on Financing Receivables) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Number of Contracts		15
Troubled Debt Resturcuring, Pre-Modification Recorded Investment		$ 3,609
Troubled Debt Restructuring, Post-Modification Recorded Investment		3,534
Commercial: Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Number of Contracts		2
Troubled Debt Resturcuring, Pre-Modification Recorded Investment		482
Troubled Debt Restructuring, Post-Modification Recorded Investment		448
Commercial: Secured by commercial real estate [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Number of Contracts		1
Troubled Debt Resturcuring, Pre-Modification Recorded Investment		2,380
Troubled Debt Restructuring, Post-Modification Recorded Investment		2,346
Commercial: Secured by residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Number of Contracts	10	10
Troubled Debt Resturcuring, Pre-Modification Recorded Investment	564	564
Troubled Debt Restructuring, Post-Modification Recorded Investment	564	564
Retail: 1-4 family residential mortgages [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Number of Contracts		1
Troubled Debt Resturcuring, Pre-Modification Recorded Investment		145
Troubled Debt Restructuring, Post-Modification Recorded Investment		139
Retail: Home equity loans and lines [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Number of Contracts		1
Troubled Debt Resturcuring, Pre-Modification Recorded Investment		38
Troubled Debt Restructuring, Post-Modification Recorded Investment		$ 37