Loans and Leases (Loans Acquired By Loan Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	$ 809,169	$ 950,516	$ 1,186,498
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	499,970	593,614
Commercial | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	20,766	33,880
Commercial | Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	453,013	525,468
Commercial | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	12,645	17,076
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	11,844	15,182
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	1,702	2,008
Noncommercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	309,199	356,902
Noncommercial | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCI Loans	$ 1,772	$ 2,273