Loans and Leases (Carrying amount loans not covered by loss share agreements) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	$ 9,257	$ 7,716
Non Impaired Purchased Loans	1,272,662	775,581
Total Purchased Loans	1,281,919	783,297
Commercial
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	2,545	0
Non Impaired Purchased Loans	184,963	159,393
Total Purchased Loans	187,508	159,393
Commercial real estate
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	5,997	7,716
Non Impaired Purchased Loans	723,390	494,010
Total Purchased Loans	729,387	501,726
Agricultural and agricultural real estate
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	0	0
Non Impaired Purchased Loans	1,296	2,985
Total Purchased Loans	1,296	2,985
Residential real estate
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	715	0
Non Impaired Purchased Loans	293,176	85,549
Total Purchased Loans	293,891	85,549
Consumer
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	0	0
Non Impaired Purchased Loans	69,837	33,644
Total Purchased Loans	$ 69,837	$ 33,644