Loans and Allowance for Loan and Lease Losses (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended					3 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended
	Dec. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Troubled Debt Restructurings - Current Year Singular Business Relationship 1 [Member] loan	Dec. 31, 2012 Troubled Debt Restructurings - Prior Year Singular Business Relationship 1 [Member] loan	Mar. 31, 2013 Residential mortgage [Member]	Dec. 31, 2012 Residential mortgage [Member] loan	Mar. 31, 2013 Commercial and industrial [Member]	Dec. 31, 2012 Commercial and industrial [Member]	Mar. 31, 2013 Home equity [Member]	Mar. 31, 2013 Lease financing [Member]	Mar. 31, 2013 Home Equity Lines Of Credit [Member]	Mar. 31, 2013 Commercial Participation Loans [Member] loan	Dec. 31, 2012 Commercial Participation Loans [Member] loan	Mar. 31, 2013 Unrelated Nonparticipation Loans [Member] loan	Dec. 31, 2012 Unrelated Nonparticipation Loans [Member] loan	Dec. 31, 2012 Nonaccruing [Member] loan	Mar. 31, 2012 Nonaccruing [Member] loan	Dec. 31, 2012 Accruing [Member] Residential mortgage [Member]	Mar. 31, 2012 Accruing [Member] Residential mortgage [Member] loan
Financing Receivable, Allowance for Credit Losses [Line Items]
Loan Terms						30 years		1 year		20 years		5 years
Loan To Value Ratio						100.00%		80.00%		85.00%
Loan To Value Ratio, Exposure After Private Mortgage Insurance						85.00%
Portfolio Percentage											0.25%
Financing Receivable, Modifications, Recorded Investment	$ 3,394	$ 3,362	$ 3,362	$ 620	$ 634	$ 475	$ 448	$ 30	$ 30				$ 1,616	$ 1,663	$ 779	$ 671	$ 2,968	$ 3,015	$ 426	$ 347
Financing Receivable, Modifications, Number of Contracts				5	5		7						3	3	4	2	10	12		6
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0