Loans and Leases (Carrying amount loans not covered by loss share agreements (in text)) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan and lease losses	$ 49,738	$ 48,685
2016 and 2015 Acquisitions
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractually required payments of loans acquired	21,000
Estimated fair value of loans acquired	13,100
Allowance for loan and lease losses	205
Contractually required payments receivable of nonimpaired loans	1,550,000
Estimated fair value of nonimpaired loans acquired	$ 1,510,000