Loans and Leases (Carrying amount loans covered by loss share agreements) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired purchased loans	$ 1,030	$ 687
Non impaired purchased loans	4,846	6,566
Total covered loans	5,876	7,253
Commercial and Commercial Real Estate
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired purchased loans	530	598
Non impaired purchased loans	1,872	2,476
Total covered loans	2,402	3,074
Agricultural and Agricultural Real Estate
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired purchased loans	0	0
Non impaired purchased loans	446	748
Total covered loans	446	748
Residential Real Estate
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired purchased loans	0	0
Non impaired purchased loans	2,433	2,645
Total covered loans	2,433	2,645
Consumer
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired purchased loans	500	89
Non impaired purchased loans	95	697
Total covered loans	$ 595	$ 786