Loans and Leases (Troubled debt restructurings on financing receivables) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 loans	Mar. 31, 2013 loans
Financing Receivable, Modifications [Line Items]
Number of loans	1	7
Pre-modification recorded investment	$ 368	$ 7,892
Post-modification recorded investment	368	7,892
Commercial
Financing Receivable, Modifications [Line Items]
Number of loans	0	2
Pre-modification recorded investment	0	4,670
Post-modification recorded investment	0	4,670
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of loans	1	0
Pre-modification recorded investment	368	0
Post-modification recorded investment	368	0
Commercial and Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of loans	1	2
Pre-modification recorded investment	368	4,670
Post-modification recorded investment	368	4,670
Agricultural and Agricultural Real Estate
Financing Receivable, Modifications [Line Items]
Number of loans	0	3
Pre-modification recorded investment	0	2,576
Post-modification recorded investment	0	2,576
Residential Real Estate
Financing Receivable, Modifications [Line Items]
Number of loans	0	2
Pre-modification recorded investment	0	646
Post-modification recorded investment	0	646
Consumer
Financing Receivable, Modifications [Line Items]
Number of loans	0	0
Pre-modification recorded investment	0	0
Post-modification recorded investment	$ 0	$ 0