Loans and Leases (Carrying amount loans not covered by loss share agreements) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	$ 8,055
Non Impaired Purchased Loans	363,287
Total Purchased Loans	371,342
Commercial
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	0
Non Impaired Purchased Loans	123,442
Total Purchased Loans	123,442
Commercial real estate
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	8,055
Non Impaired Purchased Loans	191,297
Total Purchased Loans	199,352
Agricultural and agricultural real estate
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	0
Non Impaired Purchased Loans	3,124
Total Purchased Loans	3,124
Residential real estate
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	0
Non Impaired Purchased Loans	24,299
Total Purchased Loans	24,299
Consumer
Loans covered by loss share agreement (carrying amount) [Line Items]
Impaired Purchased Loans	0
Non Impaired Purchased Loans	21,125
Total Purchased Loans	$ 21,125