Loans and Leases (Carrying Amount Loans Covered by Loss Share Agreements) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	$ 687	$ 3,056
Non Impaired Purchased Loans	6,566	10,291
Total Covered Loans	7,253	13,347
Commercial Portfolio Segment
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	598	2,553
Non Impaired Purchased Loans	2,476	3,827
Total Covered Loans	3,074	6,380
Agricultural Portfolio Segment
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	0	0
Non Impaired Purchased Loans	748	1,659
Total Covered Loans	748	1,659
Residential Portfolio Segment
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	0	0
Non Impaired Purchased Loans	2,645	4,158
Total Covered Loans	2,645	4,158
Consumer Portfolio Segment
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	89	503
Non Impaired Purchased Loans	697	647
Total Covered Loans	$ 786	$ 1,150