Loans and Allowance for Loan and Lease Losses (Troubled Debt Restructurings) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investments	$ 7,984	$ 7,924
Post-Modification Outstanding Recorded Investments	4,395	4,335
Recorded Investment	3,362	3,394	3,362
Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investments	40	40
Post-Modification Outstanding Recorded Investments	35	35
Recorded Investment	30	30
Commercial real estate [Member]
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investments	7,326	7,326
Post-Modification Outstanding Recorded Investments	3,748	3,748
Recorded Investment	2,857	2,916
Residential mortgage [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts		7
Pre-Modification Outstanding Recorded Investments	618	558
Post-Modification Outstanding Recorded Investments	612	552
Recorded Investment	475	448
Residential mortgage [Member] | Troubled Debt Restructurings Occurring During The Current Reporting Period [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	1
Pre-Modification Outstanding Recorded Investments	60
Post-Modification Outstanding Recorded Investments	60
Recorded Investment	$ 60