Loans and Leases (Troubled debt restructured loans with payment default) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 loans	Sep. 30, 2012 loans	Sep. 30, 2013 loans	Sep. 30, 2012 loans
Financing Receivable, Modifications [Line Items]
Number of loans with payment defaults	1	3	4	3
Recorded investment for loans with payment defaults	$ 13,000	$ 1,439	$ 17,837	$ 1,439
Commercial
Financing Receivable, Modifications [Line Items]
Number of loans with payment defaults	1	0	2	0
Recorded investment for loans with payment defaults	13,000	0	17,670	0
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of loans with payment defaults	0	1	0	1
Recorded investment for loans with payment defaults	0	1,380	0	1,380
Commercial and Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of loans with payment defaults	1	1	2	1
Recorded investment for loans with payment defaults	13,000	1,380	17,670	1,380
Agricultural and Agricultural Real Estate
Financing Receivable, Modifications [Line Items]
Number of loans with payment defaults	0	0	0	0
Recorded investment for loans with payment defaults	0	0	0	0
Residential Real Estate
Financing Receivable, Modifications [Line Items]
Number of loans with payment defaults	0	2	2	2
Recorded investment for loans with payment defaults	0	59	167	59
Consumer
Financing Receivable, Modifications [Line Items]
Number of loans with payment defaults	0	0	0	0
Recorded investment for loans with payment defaults	$ 0	$ 0	$ 0	$ 0